RUCS65iP - Boiler Rinnai - Free user manual and instructions

USER MANUAL RUCS65iP Rinnai

Direct Vent Tankless Water Heater Installaon and Operaon Manual — Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other appliance. — WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance. Do not touch any electrical switch; do not use any phone in your building. Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instrucons. If you cannot reach your gas supplier, call the re department. — Installaon and service must be performed by a licensed professional. If the informaon in these instrucons is not followed exactly, a re or explosion may result causing property damage, personal injury, or death. WARNING READ ALL OF THE INSTRUCTIONS THOROUGHLY BEFORE INSTALLING OR OPERATING THIS WATER HEATER. This manual provides informaon on the installaon, operaon, and maintenance of the water heater. For proper operaon and safety, it is important to follow the instrucons and adhere to the safety precauons. A licensed professional must install the water heater according to the exact instrucons in this manual. The consumer must read the enre manual to properly operate the water heater and to have regular maintenance performed.

FOR OUTDOOR APPLICATIONS ONLY

• RUS65e REU-KCM2025W-US RUS75e
• REU-KCM2528W-US SANITATION Low Lead Content NSF/ANSI 372 C US U328-07002 KCM Series Manual Table of Contents This is the safety alert symbol. This symbol alerts you to potenal hazards that can kill or hurt you and others. Indicates an imminently hazardous situaon which, if not avoided, will result in personal injury or death. Indicates a potenally hazardous situaon which, if not avoided, could result in personal injury or death. Indicates a potenally hazardous situaon which, if not avoided, could result in minor or moderate injury. It may also be used to alert against unsafe pracces. DANGER CAUTION WARNING Table of Contents p. 2
• Safety Behaviors and Pracces for the Consumer and Installer p. 3
• Installaon Instrucons (for the licensed professional) p. 4
• Prepare for Installaon p. 5
• Determine Installaon Locaon p. 6
• Freeze Protecon p. 10
• Checklist to Determine Installaon Locaon p. 11
• Mount to Wall p. 11
• Remove the Front Panel p. 11
• Installaon of Venng (indoor models only) p. 12
• Determining Vent Conguraon p. 13
• Twin Pipe PVC/CPVC Vent Installaon p. 20
• Condensate p. 37
• Checklist for Venng and Condensate (indoor models only) p. 37
• Installaon of Plumbing p. 38
• Checklist for Plumbing p. 41
• Installaon of Gas Supply p. 41
• Connect Electricity p. 43
• Adjustment for High Altude Installaons p. 43
• Adjustment for Vent Length (indoor models only) p. 43
• Checklist for Gas and Electricity p. 43
• Installaon of Temperature Controller p. 44
• Final Checklist p. 46
• Technical Data p. 47
• Specicaons p. 47
• Dimensions p. 48
• Pressure Drop and Water Flow Curves p. 49
• Ladder Diagram p. 50
• Operaon Instrucons p. 51
• Consumer Operaon Guidelines for the Safe Operaon of your Water Heater p. 52
• How to set the Temperature p. 53
• How to use the Oponal Temperature Controller p. 54
• Diagnosc Codes p. 56
• Required Maintenance p. 59
• Freeze Protecon and Winterizaon p. 60
• Flushing the Heat Exchanger p. 61
• Manual Draining of the Water Heater p. 62
• State Regulaons p. 63
• Replacement Parts p. 64
• Warranty p. 65
• French Version p. 67
• Important Safety Informaon Safety Denions NOTICE: Rinnai somemes shares customer contact informaon with businesses that we believe provide products or services that may be useful to you. By providing this informaon, you agree that we can share your contact informaon for this purpose. If you prefer not to have your informaon shared with these businesses, please contact customer service and ask not to have your informaon shared. We will however, connue to contact you with informaon relevant to the product(s) you registered and/ or your account with us. If you have any quesons or feel that the manual is incomplete contact Rinnai at 1-800-621-9419.KCM Series Manual 3 CAUTION BURN HAZARD. Hot exhaust and vent may cause serious burns. Keep away from the water heater unit. Keep small children and animals away from the unit. Hot water outlet pipes leaving the unit can be hot to touch. In residenal applicaons, insulaon must be used for hot water pipes below 36” due to burn risk to children. Safety Behaviors and Pracces for the Consumer and Installer Before operang, smell all around the appliance area for gas. Be sure to smell next to the oor because some gas is heavier than air and will sele on the oor. Keep the area around the appliance clear and free from combusble materials, gasoline, and other ammable vapors and liquids. Combusble construcon refers to adjacent walls and ceiling and should not be confused with combusble or ammable products and materials. Combusble and/or ammable products and materials should never be stored in the vicinity of this or any gas appliance. Always check the water temperature before entering a shower or bath. To protect yourself from harm, before performing maintenance: Turn o the electrical power supply by unplugging the power cord or by turning o the electricity at the circuit breaker. (The temperature controller does not control the electrical power.) Turn o the gas at the manual gas valve, usually located immediately below the water heater. Turn o the incoming water supply. This can be done at the isolaon valve immediately below the water heater or by turning o the water supply to the building. WARNING Use only your hand to push in or turn the gas control knob. Never use tools. If the knob will not push in or turn by hand, do not try to repair it; call a licensed professional. Force or aempted repair may result in a re or explosion. Do not use this appliance if any part has been under water. Immediately call a licensed professional to inspect the appliance and to replace any part of the control system and any gas control which has been under water. Do not use substute materials. Use only parts cered for the appliance. Should overheang occur or the gas supply fail to shut o, turn o the manual gas control valve to the appliance. Do not adjust the DIP switch unless specically instructed to do so. Do not use an extension cord or an adapter plug with this appliance. Any alteraon to the appliance or its controls can be dangerous and will void the warranty. Proper venng is required for the safe operaon of this appliance. California law requires this noce to be provided: California Proposion 65: This product contains chemicals known to the state of California to cause cancer, birth defects, or other reproducve harm. WARNING4 KCM Series Manual A licensed professional must install the appliance, inspect it, and leak test it before use. The warranty will be voided due to any improper installaon. The installer should have skills such as: Gas sizing. Connecng gas lines, water lines, valves, and electricity. Knowledge of applicable naonal, state, and local codes. Installing venng through a wall or roof. Training in installaon of tankless water heaters. (Training can be accessed on-line at www.trainingevents.rinnai.us) Installaon Steps Prepare for Installaon p. 5
• Determine Installaon Locaon p. 6
• Freeze Protecon p. 10
• Checklist to Determine Installaon Locaon p. 11
• Mount to Wall p. 11
• Remove the Front Panel p. 11
• Installaon of Venng (indoor models only) p. 12
• Condensate (indoor models only) p. 37
• Checklist for Venng and Condensate p. 37
• Installaon of Plumbing p. 38
• Checklist for Plumbing p. 41
• Installaon of Gas Supply p. 41
• Connect Electricity p. 43
• Adjustment for High Altude Installaons p. 43
• Adjustment for Vent Length (indoor models only) p. 43
• Checklist for Gas and Electricity p. 43
• Installaon of Temperature Controller p. 44
• Final Checklist General Instrucons Installer Qualicaons DO NOT Do not install the RUCS65i, or the RUCS75i outdoors. Do not install the RUS65e, or the RUS75e indoors. Do not install the appliance in an area where water leakage of the unit or connecons will result in damage to the area adjacent to the appliance or to lower oors of the structure. When such locaons cannot be avoided, it is recommended that a suitable drain pan, adequately drained, be installed under the appliance. The pan must not restrict combuson air ow. Do not obstruct the ow of combuson and venlaon air. Combuson air shall not be supplied from occupied spaces. Do not use this appliance in an applicaon such as a pool or spa heater that uses chemically treated water . (This appliance is suitable for lling large or whirlpool spa tubs with potable water.) Do not use substute parts that are not authorized for this appliance. MUST DO The installaon must conform with local codes or, in the absence of local codes, with the Naonal Fuel Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas and Propane Installaon Code, CSA B149.1. If installed in a manufactured home, the installaon must conform with the Manufactured Home Construcon and Safety Standard, Title 24 CFR, Part 3280 and/or CAN/SCA Z240 MH Series, Mobile Homes. The appliance, when installed, must be electrically grounded in accordance with local codes or, in the absence of local codes, with the Naonal Electrical Code, ANSI/NFPA 70, or the Canadian Electrical Code, CSA C22.1. The appliance and its appliance main gas valve must be disconnected from the gas supply piping system during any pressure tesng of that system at test pressures in excess of 1/2 psi (3.5 kPa) (13.84 in W.C.). Type of installaon For installaon in residenal applicaons only. Cered for installaon in manufactured (mobile) homes. Installaon Instrucons (for the licensed professional)KCM Series Manual 5 Prepare for installaon Parts included Tools needed Materials needed The appliance must be isolated from the gas supply piping system by closing its individual manual shuto valve during any pressure tesng of the gas supply piping system at test pressures equal to or less than 1/2 psi (3.5 kPa) (13.84 in W.C.). You must follow the installaon instrucons and those in Care and Maintenance for adequate combuson air intake and exhaust. INFORMATION If a water heater is installed in a closed water supply system, such as one having a backow preventer in the cold water supply line, means shall be provided to control thermal expansion. Contact the water supplier or local plumbing inspector on how to control thermal expansion. Should overheang occur or the gas supply fail to shut o, turn o the manual gas control valve to the appliance. Keep the air intake locaon free of chemicals, such as chlorine or bleach, that produce fumes. These fumes can damage components and reduce the life of your appliance. Tankless water heater Self Tapping Screws (Qty - 2) Pipe wrenches (2) Adjustable pliers Screwdrivers (2) Wire cuers Gloves Safety glasses Level Tools that might be needed Hammer drill with concrete bits Saw Threading machine with heads and oiler Core drill with diamond head Torch set Copper tubing cuer Steel pipe cuer Materials that may be needed Soap or gas leak detector soluon Approved venng Teon tape (recommended) or pipe compound Pressure Relief Valve Heat tape Pipe insulaon Electrical wire and conduit per local code Concrete wall anchors Oponal pipe cover Oponal temperature controller (MC-91-2) PVC glue/cement 5/8” ID PVC exible tubing 2 conductor 22 AWG wire for controller Single gang electrical box Wire nuts Unions and drain valves Isolaon Valve Kit General Instrucons (connued)6 KCM Series Manual Consideraon of care for your water heater should include evaluaon of water quality. The water must be potable, free of corrosive chemicals, sand, dirt, or other contaminates. It is up to the installer to ensure the water does not contain corrosive chemicals, or elements that can aect or damage the heat exchanger. Water that contains chemicals exceeding the levels below aect and damage the heat exchanger. Replacement of the heat exchanger due to water quality damage is not covered by the warranty. Maximum Level Total Hardness Up to 200 mg / L Aluminum * Up to 0.2 mg / L Chlorides * Up to 250 mg / L Copper * Up to 1.0 mg / L Dissolved Carbon Dioxide (CO2) Up to 15.0 mg / L or PPM Iron * Up to 0.3 mg / L Manganese * Up to 0.05 mg / L pH * 6.5 to 8.5 TDS (Total Dissolved Solids) * Up to 500 mg / L Zinc * Up to 5 mg / L Determine Installaon Locaon Environment Air surrounding the water heater, venng, and vent terminaon(s) is used for combuson and must be free of any compounds that cause corrosion of internal components. These include corrosive compounds that are found in aerosol sprays, detergents, bleaches, cleaning solvents, oil based paints/ varnishes, and refrigerants. The air in beauty shops, dry cleaning stores, photo processing labs, and storage areas for pool supplies oen contains these compounds. Therefore it is recommended that outdoor models be used for these locaons where possible. The water heater, venng, and vent terminaon(s) should not be installed in any areas where the air may contain these corrosive compounds. If it is necessary for a water heater to be located in areas that may contain corrosive compounds, the following instrucons are strongly recommended. IMPORTANT CONSIDERATIONS FOR: Indoor/Internal Water Heaters DO NOT Install in areas where air for combuson might be contaminated with chemicals. Before installaon, consider where air has the ability to travel within the building to the water heater. Where possible, install the water heater in a sealed closet so that it is protected from the potenal of contaminated indoor air. Chemicals that are corrosive in nature should not be stored or used near the water heater. Outdoor/External Water Heaters and Vent Terminaons of Indoor/Internal Water Heaters Install the water heater as far away as possible from exhaust vent hoods. Install as far away as possible from any air inlet vents. Corrosive fumes may be released through these vents when air is not being brought in through them. Chemicals that are corrosive in nature should not be stored or used near the water heater or vent terminaon. Damage and repair due to corrosive compounds in the air is not covered by warranty. Water Quality p. 46

• Source: Part 143 Naonal Secondary Drinking Water Regulaons If you install this water heater in an area that is known to have hard water or that causes scale build-up the water must be treated and may require more frequent heat exchanger ushing schedule. When scale build-up in the heat exchanger begins to aect the performance of the water heater, a diagnosc code “LC#” will display. Flush the heat exchanger to prevent damage to it. Scale build up is caused by hard water and can be accelerated if the unit is set at a high temperature. Rinnai oers Southeastern Filtraon’s “ScaleCuer Water Condioning System” that oers superior lime scale prevenon and corrosion control by feeding a blend of control compounds into the cold water supply. You must ensure that clearances will be met and that the vent length will be within required limits. Consider the installaon environment, water quality, and need for freeze protecon. Requirements for the gas line, water lines, electrical connecon, and condensate disposal can be found in their respecve installaon secons of this manual. Part Number Descripon 103000038 Southeastern Filtratrion ScaleCuer System 3/4” Feed 103000039 ScaleCuer RellKCM Series Manual 7 INSIDECORNER DETAILFIXEDCLOSEDOPERABLEFIXEDCLOSEDOPERABLE

[1] A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings. [2] Permied only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the oor. For clearances not specied in ANSI Z223.1/NFPA 54, clearances are in accordance with local installaon codes and the requirements of the gas supplier. Clearance to opposite wall is 24 inches (60 cm).

For indoor models, you must install a vent terminaon to bring in combuson air and expel exhaust to the outside. SNOW TERMINATION Clearance in Ref. A also applies to anticipated snow line Ref Descripon Canadian Installaons US Installaons A Clearance above grade, veranda, porch, deck, or balcony 12 inches (30 cm) 12 inches (30 cm) B Clearance to window or door that may be opened 36 inches (91 cm) 12 inches (30 cm) C Clearance to permanently closed window * *

Vercal clearance to venlated sot, located above the terminal within a horizontal distance of 2 feet (61 cm) from the center line of the terminal

E Clearance to unvenlated sot * * F Clearance to outside corner * * G Clearance to inside corner * *

Clearance to each side of center line extended above meter/regulator assembly 3 feet (91 cm) within a height 15 feet (4.5 m) above the meter/ regulator assembly

I Clearance to service regulator vent outlet 36 inches (91 cm) *

Clearance to nonmechanical air supply inlet to building or the combuson air inlet to any other appliance 36 inches (91 cm) 12 inches (30 cm) K Clearance to a mechanical air supply inlet 6 feet (1.83 m) 3 feet (91 cm) above if within 10 feet (3 m) horizontally

Clearance above paved sidewalk or paved driveway located on public property 7 feet (2.13 m) * M Clearance under veranda, porch, deck, or balcony 12 inches (30 cm) * Direct Vent Terminal Clearances (Indoor Units)8 KCM Series Manual Other Than Direct Vent Terminal Clearances (Outdoor Units) INSIDECORNER DETAILFIXEDCLOSEDOPERABLEFIXEDCLOSEDOPERABLE

[1] A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings. [2] Permied only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the oor. For clearances not specied in ANSI Z223.1/NFPA 54, clearances are in accordance with local installaon codes and the requirements of the gas supplier. Clearance to opposite wall is 24 inches (60 cm).

Ref Descripon Canadian Installaons (CSA B149.1) US Installaons (ANSI Z223.1 / NFPA 54) A Clearance above grade, veranda, porch, deck, or balcony 12 inches (30 cm) 12 inches (30 cm) B Clearance to window or door that may be opened 6 in (15 cm) for appliances ≤ 10,000 Btuh (3 kW), 12 in (30 cm) for appliances > 10,000 Btuh (3 kW) and ≤ 100,000 Btuh (30 kW), 36 in (91 cm) for appliances >100,000 Btuh (30 kW) 4 (1.2 m) below or to side of opening; 1 (300 mm) above opening C Clearance to permanently closed window * *

Vercal clearance to venlated sot, located above the terminal within a horizontal distance of 2 feet (61 cm) from the center line of the terminal

E Clearance to unvenlated sot * * F Clearance to outside corner * * G Clearance to inside corner * *

Clearance to each side of center line extended above meter/regulator assembly 3 feet (91 cm) within a height 15 feet (4.5 m) above the meter/regulator assembly

I Clearance to service regulator vent outlet 36 inches (91 cm) *

Clearance to non-mechanical air supply inlet to building or the combuson air inlet to any other appliance 6 in (15 cm) for appliances ≤ 10,000 Btuh (3 kW), 12 in (30 cm) for appliances > 10,000 Btuh (3 kW) and ≤ 100,000 Btuh (30 kW), 36 in (91 cm) for appliances >100,000 Btuh (30 kW) 4 (1.2 m) below or to side of opening; 1 (300 mm) above opening K Clearance to a mechanical air supply inlet 6 feet (1.83 m) 3 feet (91 cm) above if within 10 feet (3 m) horizontally

Clearance above paved sidewalk or paved driveway located on public property 7 feet (2.13 m) * M Clearance under veranda, porch, deck, or balcony 12 inches (30 cm) * Clearance in Ref. A also applies to ancipated snow lineKCM Series Manual 9 Addional clearances Check to determine whether local codes supersede these clearances. Avoid terminaon locaons near a dryer vent. Avoid terminaon locaons near commercial cooking exhaust. Avoid terminaon locaons near any air inlets. You must install a vent terminaon at least 12 inches above the ground or ancipated snow level. (0.30 m) between terminals at same level (1.52 m) vercally between terminals 60"

(1.52 m) between terminals at dierent levels 24"

(0.61 m) to wall or parapet 12" V V

RUS65e, RUS75e RUCS65i, RUCS75i The vent for this appliance shall not terminate Over public walkways; or Near sot vents or crawl space vents or other area where condensate or vapor could create a nuisance or hazard or cause property damage; or Where condensate or vapor could cause damage or could be detrimental to the operaon of regulators, relief valves, or other equipment. Important consideraons for locang vent terminaon under a sot (venlated or unvenlated or eave vent; or to a deck or porch) Do not install vent terminaon under a sot vent such that exhaust can enter the sot vent Install vent terminaon such that exhaust and rising moisture will not collect under eaves. Discoloraon to the exterior of the building could occur if installed too close. Do not install the vent terminaon too close under the sot where it could present recirculaon of exhaust gases back into the combuson air intake part of the terminaon. 2"12"60"36" (0.91 m) to venlated or unvenlated sot or eve vent; or to a deck or porch (1.52 m) vercally between terminals (50 mm) between terminals at same level (0.30 m) to an inside corner 12" 12" 36" INSIDE CORNER V V (0.30 m) between terminals at same level (0.30 m ) to an inside corner10 KCM Series Manual Unit clearances Indoor models: RUCS65i, RUCS75i to Combusbles inches (mm) to Non- Combusbles inches (mm) Top of Heater 6 * (152) 2 *(51) Back of Heater 0 (zero) 0 (zero) Front of Heater 6 (152) 6 (152) Sides of Heater 2 (51) 1/2 (13) Ground/Boom 12 (305) 12 (305) Vent 0 (zero) 0 (zero)

• 0 inches from vent components and condensate drain line. The clearance for servicing is 24 inches in front of the water heater. For closet installaon, clearance is 6 inches (152 mm from the front of the water heater. Outdoor models: RUS65e, RUS75e to Combusbles inches (mm) to Non- Combusbles inches (mm) Top of Heater 12 (305) 2 (51) Back of Heater 0 (zero) 0 (zero) Front (panel) 24 (610) 0 (zero) Front (exhaust) 24 (610) 24 (610) Sides of Heater 6 (152) 1/8 (3.2) Ground/Boom 12 (305) 2 (51) The clearance for servicing is 24 inches in front of the water heater. Freeze Protecon Make sure that in case of freezing weather the water heater and its water lines are protected to prevent freezing. Damage due to freezing is not covered by the warranty. With electrical power and gas supplied, the water heater will not freeze when the outside air temperature is as cold as –22°F (-30°C) for indoor models or is as cold as –4°F (-20°C) for outdoor models, when protected from direct wind exposure. Because of the “wind-chill” eect, any wind or circulaon of the air on the unit will reduce its ability to protect itself from freezing. In the event of a power failure and/or gas interrupon at temperatures below freezing the water heater should be drained of all water to prevent freezing damage. In addion, drain the condensate trap and drain line. Loss of freeze protecon may result in water damage from a burst heat exchanger or water lines. The unit may be drained manually. However, it is highly recommended to: drain down solenoid valves be purchased and installed that will automacally drain the unit if power is lost. These are available in a kit, 104000059. (The condensate trap is not aected by the auto drain down solenoid valves and will have to be manually drained.) a surge protector with terminals be purchased and installed which allows the solenoid valves to operate if the unit is disabled due to a diagnosc code. This is available as 104000057. In addion, the solenoid valves should be connected electrically to a surge protector with terminals. This allows the solenoid valves to operate if the water heater is disabled due to a diagnosc code. The freeze protecon features of the water heater will not prevent the external piping from freezing. It is recommended that hot and cold water pipes be insulated. Pipe cover enclosures may be packed with insulaon for added freeze protecon. It is recommended that the condensate trap drain line be insulated. A frozen condensate trap results in a diagnosc code 25.KCM Series Manual 11 Mount to Wall wall installaon brackets

1. Idenfy the installaon locaon and conrm that

the installaon will meet all required clearances.

2. Securely aach the water heater to the wall

using any of the holes in the wall installaon brackets which are at the top and boom of the water heater. Ensure that the aachment strength is sucient to support the weight of the water heater. Refer to the weight of the water heater in the Specicaons secon of this manual. Use a leveling tool to ensure that the water heater is level. Proper operaon requires that the water heater be level. Checklist to Determine Installaon Locaon □ The water heater is not exposed to corrosive compounds in the air. □ The water heater locaon complies with all required clearances. □ For indoor models, the planned venng will not exceed the maximum length for the number of elbows used. □ The planned venng terminaon/air intake locaon meets all required clearances. □ Indoor air is not being used for combuson. □ The water supply does not contain chemicals or exceed total hardness that will damage the heat exchanger. □ A standard 3 prong 120 VAC, 60 Hz properly grounded wall outlet (for indoor models) or other 120 VAC, 60 Hz source is available. □ The installaon must conform with local codes or, in the absence of local codes, with the Naonal Fuel Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas and Propane Installaon Code, CSA B149.1. If installed in a manufactured home, the installaon must conform with the Manufactured Home Construcon and Safety Standard, Title 24 CFR, Part 3280 and/or CAN/SCA Z240 MH Series, Mobile Homes. □ Leave the enre manual taped to the water heater (indoor models) or give the enre manual directly to the consumer. Remove the Front Panel Slide the plasc trim pieces on each side of the water heater to expose the screws. Remove the 4 screws and pull o the front panel. NOTICE The water heater must be installed in an upright posion. Do not install upside down or on its side.12 KCM Series Manual Installaon of Venng (indoor models only) Install the correct venng for your model according to the venng manufacturer’s instrucons and the guidelines below. Refer to the vent manufacturer’s technical literature for specic part numbers and instrucons. Manufacturer Vent Product Vercal Terminaon Horizontal Terminaon Ubbink Rolux 184162PP 223176PP, 223177PP Centrotherm InnoFlue ICRT3539 ISELL0387UV Heat-Fab Saf-T Vent Saf-T Vent CI Plus Wall Terminaon Saf-T Vent CI Plus Rain Cap Metal-Fab Corr/Guard 3CGRVDK 3CGRVT Ipex Concentric Kit 3”- 196006 /197009 4”-196021 /197021 3”- 196006 / 197009 4”-196021 / 197021 Ipex Low Prole Terminaon Kit — 3”- 196985 4”- 196986 Various Manufacturers Schedule 40 PVC DWV Solid Core Pipe (or approved equal) CPVC schedule 40 Reference “Approved PVC/CPVC Vent Conguraons” Table Reference “Approved PVC/ CPVC Vent Conguraons” Table Manufacturer Listed and Tested Vent Products Telephone Fax Contact Ubbink Rolux Condensing Vent System 800-621-9419 678-829-1666 www.rinnai.us Centrotherm InnoFlue Vent System (single wall SW, 3 inch diameter) 877-434-3432 518-618-3166 [e-mail] www.centrotherm.us.com Heat-Fab Saf-T Vent SC system 800-772-0739 413-863-4803 [e-mail], www.heaab.com Metal-Fab Corr/Guard Vent/Air Intake System 800-835-2830 316-943-2717 [e-mail], www.metal-fabinc.com Ipex Concentric Kit / Low Prole Terminaon Kit U.S. - 800-463-9572 CA. - 866-473-9462

www.ipexamerica.com www.ipexinc.com Various Manufacturers Schedule 40 PVC DWV Solid Core Pipe (or approved equal) CPVC schedule 40

Approved Vent Manufacturers Approved Vent Products Proper venng is required for the safe operaon of this appliance.KCM Series Manual 13 Venng Guidelines DO NOT Do not use cellular core PVC/CPVC. Do not use Radel, ABS, or galvanized material to vent this appliance. Do not cover non-metallic vent pipe and ngs with thermal insulaon. Do not combine vent components from dierent manufacturers. Vent diameter must not be reduced. Do not connect the venng system with an exisng vent or chimney. Do not common vent. MUST DO This water heater is a direct vent water heater and therefore is cered and listed with the vent system. You must use vent components that are cered and listed with the water heater model. The vent system must vent directly to the outside of the building and use outside air for combuson. Avoid dips or sags in horizontal vent runs by installing supports per the vent manufacturer’s instrucons. Support horizontal vent runs every four feet and all vercal vent runs every six feet or in accordance with local codes. Venng should be as direct as possible with a minimum number of pipe ngs. Vent connecons must be rmly pressed together so that the gaskets form an air ght seal. The vent piece connected to the water heater must be secured with one self-tapping screw. INFORMATION Refer to the instrucons of the vent system manufacturer for component assembly instrucons. If the vent system is to be enclosed, it is suggested that the design of the enclosure permit inspecon of the vent system. The design of such enclosure shall be deemed acceptable by the installer or the local inspector. NOTICE If it becomes necessary to access an enclosed vent system for service or repairs, Rinnai is not responsible for any costs or dicules in accessing the vent system. The warranty does not cover obtaining access to a vent system in an enclosed environment. Venng Dip Switch Sengs Venng Style SW4 in DIPSW 2 Concentric OFF Twin Pipe ON Determining Vent Conguraon Prior to the installaon of the vent system, the dip switches on the PCB board must be properly set for the venng conguraon selected for the applicaon. (Unit comes defaulted for concentric applicaons) SW4 OFF-Concentric ON-Twin Pipe DIPSW 2 DIPSW 114 KCM Series Manual Determining Vent Conguraon Prior to the installaon of the vent system, the unit must be properly adjusted for the venng conguraon selected for the applicaon. Any issues resulng from improper installaon will not be covered by warranty. Ducted outside air is mandatory for all twin pipe conguraons. NOTICE Exhaust Adapter Ring to be removed and discarded for concentric vent conguraon Concentric Vent Conguraon (Same procedure to be used for Twin Pipe with Centrotherm Adapter Conguraon) Removal of Exhaust Adapter Ring

1. Remove fastener from concentric ue

2. Remove exhaust adapter ring.

3. Install the concentric vent. Ensure it is properly

4. Secure the vent pipe to the unit with a screwKCM Series Manual 15

Intake Cap to be removed and discarded for twin pipe PVC/CPVC conguraon. Determining Vent Conguraon (connued) Removal of Intake Cap

1. Remove the fastener from intake connecon.

3. Install the intake pipe. Ensure it is properly

4. Secure the intake pipe to the unit with the

supplied screw (in the carton box).

5. Install the exhaust pipe. Ensure it is properly

6. Secure the exhaust pipe to the unit with the

supplied screw (in the carton box). WARNING DO NOT apply PVC glues, solvents, or cleaners to the water heaters intake or exhaust gasket connecons. Failure to correctly assemble the components according to these instrucons may result in property damage, personal injury, or death. Intake Gasket Connecon Exhaust Gasket Connecon16 KCM Series Manual Maximum vent length Maximum Vent Length with Concentric Venng

1. Determine the number of 90 degree elbows in

the vent system. (Two 45 degree elbows count as one 90 degree elbow.)

2. Refer to the table to nd the maximum vent

length based on the number of elbows.

3. Adjust SW1 in DIPSW 1 (tan switches) if required

by the applicable note. If the length is greater than 21 (6.4 m) then move SW1 to OFF. If the length is greater than 15 (4.6 m) then move SW1 to OFF. If the length is greater than 9 (2.7 m) then move SW1 to OFF. Move SW1 to OFF. Example: If you have one elbow then your maximum vent length is 35 feet (10.7 m). If your actual length is greater than 15 (4.6 m) then move SW1 in DIPSW 1 to OFF. If you have a longer vent length (see number 3 regarding max. vent length), SW1 in DIPSW 1 is required to be in the OFF posion. This ensures the water heater will run properly. Blocked ue diagnosc codes and shutdowns may result if SW1 in DIPSW 1 is not in the correct posion. NOTICE Vent length using short radius elbow (Intake is the short UV protected 90° elbow) Number of 90° Short Radius Elbows Maximum Straight Vent Length SW1 in DIPSW 1 If length is greater than: 0 41 (12.50 m) 18 (5.49 m) move SW1 to OFF 1 26 (7.93 m) 3 (0.91 m) move SW1 to OFF 2 11 (3.35 m) move SW1 to OFF for any length Number of 90° Long Radius Elbows Maximum Straight Vent Length SW1 in DIPSW 1 If length is greater than: 0 41 (12.50 m) 21 (6.40 m) move 1 35 (10.67 m) 15 (4.57 m) move 2 29 (8.84 m) 9 (2.74 m) move 3 23 (7.01m) 3 (0.91 m) move 4 17 (5.18 m) move SW1 to OFF for any length 5 11 (3.35 m) 6 5 (1.52 m) Vent length using long radius elbow (Intake is the long UV protected 90° elbow) Maximum Vent Length for Centrotherm 2 Pipe InnoFlue Vent System (single wall SW, 3 inch diameter) Ubbink Concentric (90° elbow is equivalent to 6 feet; 45° elbow is equivalent to 3 feet.) Maximum Equivalent Vent Length 41 (12.5 m) # of 90° Elbows Maximum Vent Length in feet (meters) 0 41 (12.5)

6 5 (1.5) 4KCM Series Manual 17 Maximum vent length Twin Pipe 3” PVC / CPVC (90° elbow is equivalent to 5 feet; 45° elbow is equivalent to 2.5 feet.) Maximum Equivalent Vent Length 41 (12.5 m) # of 90° Elbows Maximum Vent Length in feet (meters) 0 41 (12.5)** 1 36 (11.0) ** 2 31 (9.4) ** 3 26 (7.9) ** 4 21 (6.4) ** 5 16 (4.9) ** 6 11 (3.4) ** **SW 1 in DIPSW 1 is “OFF” for lengths greater than or equal to 21 feet. Twin Pipe 4” PVC / CPVC (90° elbow is equivalent to 5 feet; 45° elbow is equivalent to 2.5 feet.) Maximum Equivalent Vent Length 100 (30.5 m) # of 90° Elbows Maximum Vent Length in feet (meters) 0 100 (30.5)** 1 95 (29.0) ** 2 90 (27.4) ** 3 85 (25.9) ** 4 80 (24.4) ** 5 75 (22.9) ** 6 70 (21.3) ** Maximum Vent Length with Twin Pipe PVC / CPVC (See Twin Pipe PVC/CPVC Vent Installaon secon for more informaon regarding equivalent vent length calculaons.)18 KCM Series Manual Flue Installaon with Concentric Venng (indoor models only) Install the venng terminaon according to the diagrams and instrucons below. Secure the first vent component to the water heater with one self-tapping screw at the hole. Horizontal Termination Vertical Termination Slope the venting 1/4” per foot toward the appliance according to the vent manufacturers installation instructions. Dispose of condensate per local codes.

Securing Screw Slope the venting 1/4” per foot toward the appliance according to the vent manufacturers installation instructions. Dispose of condensate per local codes.KCM Series Manual 19 Comply with the exhaust clearances found in this Rinnai Installaon and Operaon Manual. Only one appliance can be aached to the vent system. Install the system according to the Centrotherm installaon instrucons included with the vent system. The vent terminaon and air intake must be in the same pressure zone. Do not exceed the maximum straight vent length with number of elbows as shown in the tables in the following secon. Maintain the clearances shown in the gures below. WARNING The following vent materials are NOT APPROVED for use with this appliance: Cellular core PVC/CPVC Radel, ABS, and/or Galvanized ducts. Failure to use approved vent materials can result in property damage, personal injury, or death. Vercal Terminaon Flue Installaon with Centrotherm Venng (indoor models only) Install the venng terminaon according to the diagrams and instrucons below. Horizontal Terminaon 11”

Intake Oponal Vent Slope horizontal exhaust run towards the water heater 1/4” per foot. DO NOT slope combuson air pipe towards unit. Be sure to dispose of condensate per local codes.20 KCM Series Manual

Installaons must comply with local requirements and with the Naonal Fuel Gas Code, ANSI Z223.1/NFPA 54 for U.S. installaons or CSA B149.1 for Canadian installaons. DO NOT use cellular core PVC, CPVC, or Radel based pipe materials for the exhaust vent. Vents MUST be of solid core pipes ONLY. WARNING Use only the materials listed in this secon for vent, air intake pipe, and ngs (See vent and air piping materials table). Failure to comply with this warning could result in property damage, personal injury, or death. WARNING Twin Pipe PVC/CPVC Vent InstallaonKCM Series Manual 21

Tankless Water Heaters with PVC/CPVC venng must be congured with intake air and exhaust vent using piping and methods described in this secon. Each water heater must have its own intake and vent. DO NOT common vent with any other appliance using this method. Inspect nished vent and intake air piping thoroughly to ensure all are airght and comply with the instrucons provided and with all requirements of applicable codes. Failure to provide a properly installed vent and air system will cause personal injury or death. DANGER Combuson Air Intake - The combuson air intake terminaon ng must be installed with the clearances and geometry relave to the exhaust (vent) depicted in this secon to ensure that ue products do not enter the combuson air intake. Ensure that the intake air will not contain any of the contaminants outlined in the “Determine Installaon Locaon” secon of this manual. Contaminated intake air will damage the water heater, resulng in possible property damage, personal injury, or death. Exhaust - The exhaust (vent) terminaon ng must be installed with the clearances and geometry relave to the combuson air pipe as depicted in this secon to ensure that ue products do not enter the combuson air intake WARNING If the vent and/or combuson air intake piping conguraons covered in this manual cannot be applied to a specic installaon, contact Rinnai’s Applicaon Engineer group for assistance. Other conguraons may be available. NOTICE The installaon must conform with local codes or, in the absence of local codes, with the Naonal Fuel Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas and Propane Installaon Code, CSA B149.1. DO NOT use cellular core PVC, CPVC, Radel, ABS, or galvanized material for the exhaust vent. Vents MUST be of solid core pipes ONLY. WARNING Use only the materials listed in this manual for vent, combuson air intake pipe, and ngs (See “Vent and Air Piping” table) . Failure to comply with this warning could result in property damage, personal injury, or death. WARNING If used, a masonry chimney can ONLY be used as a CHIMINEY CHASE for the exhaust and combuson air intake pipes. The exhaust and air piping must be installed as instructed in this manual. The chimney chase must be used only for the Rinnai Water Heater(s) vent chase. NO OTHER appliance or replace can be connected to the chimney chase. Exhaust and air piping materials must comply with this instrucon. The chimney chase must be ed with a sealed access opening to facilitate interior inspecon. The chimney chase (and liner, if installed) to be inspected annually for any degradaon. Failure to comply could result in property damage, personal injury, or death. WARNING22 KCM Series Manual All PVC/CPVC IPEX Concentric Vent Kit (CVK) Assemblies are cered to ULC S636. Where ULC S636 compliance is required, use only System 636 pipe, ngs, and cement at terminal connecon. DO NOT use PVC/CPVC on Non-Condensing Units. DO NOT operate unit unl venng is completely installed and all solvents and glues have bonded. All PVC/CPVC exhaust vent material used in Canada must be S636 cered. For further details on listed PVC/CPVC venng material (table below) refer to the installaon manual of the PVC/CPVC manufacturer. Twin Pipe PVC/CPVC Vent Installaon Requirments: Vent and Air Piping Materials Item Material Standard for Installaon in North America United States Canada Thermoplasc Piping Materials Vent or combuson air intake pipe & Fings PVC schedule 40 ANSI/ASTM D1785 Thermoplasc vent pipe must be cered to ULC S636. Intake pipe may be of any material listed (le).

PVC-DWV ANSI/ASTM D2665

IPEX bird screens (purchase separately) Terminaon Vent Screens Polyethylene 3" Vent screen: IPEX part # 196051; 4" Vent screen: IPEX part #: 196052 (Screens are fricon ed inside terminaon ng bells.) The listed vent, vent ngs, terminaon, cleaner, and glue are all cered as part of the condensing tankless water heater vent system. NOTE DANGER Failure to correctly install vent and combuson air intake pipes of the water heater to atmosphere as outlined in this venng secon will result in death from asphyxiaon (from carbon monoxide), re, or explosion. NEVER operate the water heater without proper venng (vent and combuson air intake). Always inspect the vent terminal unit, combuson air intake pipe, and the enre vent system axed to the water heater for proper installaon at equipment commissioning and at least annually thereaer. IMPORTANT CONSIDERATIONS FOR LOCATION: Locate the vent outlet where ue gases will not harm surrounding plants and/or cooling equipment. Avoid locang vent where prevailing winds could aect the performance of the water heater or cause recirculaon of the ue gases. DO NOT terminate the venng over a public walkway or over an area where condensate or vapor can create a nuisance / hazard or where condensate can be detrimental to the operaon of equipment such as regulators or relief valves Water Heater ue gases must be piped from the appliance to the outside, Installer MUST adhere to the instrucons provided herein and the most recent Water Heater Manual and all applicable codes. Exhaust and combuson air must terminate through the same sidewall or roof as the terminaons must be in the same pressure zone and face same direcon. Vent pipe must terminate either through the sidewall or through the roof, exhaust/vent terminaon and/or intake air openings shall adhere to clearances as set forth in the Direct Vent Terminaon Clearances diagram. Each Condensing Tankless Water Heater requires a separate vent system. For twin pipe installaon use only 3” or 4” PVC/CPVC. Terminaons must be installed 12” above grade or ancipated snow level.KCM Series Manual 23 Exhaust and Combuson Air Intake Pipe Diameters and Maximum Lengths: For PVC/CPVC vent systems reduce the maximum allowable length for each elbow and terminaon type as follows: Vent and combuson air intake pipe diameters must not exceed the maximum equivalent vent lengths referenced within this manual. Do not exceed vent and combuson air intake pipe MAXIMUM lengths (Lengths are specic to models and fuel type).

2.5 feet for every 45° elbow.

5 feet for every 90° elbow. Terminaon (refer to the Approved Vent Component table of this secon) IMPORTANT CONSIDERATIONS FOR LOCATION (connued): There are two opons for determining the vent lengths/ components necessary for the installaon. Opon 1: The installer can use the vent length calculaon sheet (below), lling in the quanty of the vent components in order to calculate the total equivalent vent lengths. Opon 2: The installer can use the maximum vent lengths tables on the next pages to determine the amount of straight pipe that can be used with a specic terminaon type and quanty of elbows. Determining Total System Equivalent Length (A blank copy of the Equivalent Vent Length Calculaon Sheet is located at the end of this secon) Ensure SW1 in DIPSW 1 is in OFF posion if vent length is greater than 21 (6.4m). Calculaon of equivalent piping lengths for venng system: Choose the vent type and ll out the calculaon sheet below. When determining equivalent combuson air and vent length, add 5 feet for each 90° elbow, 2.5 feet for each 45° elbow. OPTION 1: Example of calculaon (assume 3” diameter pipes for natural gas unit): Twin pipe (parallel) with snorkel terminal Combuson air pipe length: 16 straight pipe with 2 x 90° elbows Exhaust pipe length: 16 straight pipe with 2 x 90° elbows (include all interior and exterior elbows) Snorkel Terminaon: 15 equivalent feet (reference Approved PVC/CPVC Terminaon Components table) Calculaon: Equivalent Combuson air pipe length: [16+(2 X 5)+ 15] = 41 Equivalent Vent Length: [16+(2 X 5)+15] = 41 Total = 41 . for both exhaust and combuson air pipes, which is the maximum allowable vent length for 3” PVC/CPVC on a natural gas unit. If longer lengths are required, go to the 4” diameter pipe conguraon which is cered for up to 100 equivalent feet. Fing / Terminaon Type Number of ngs Equivalent Vent Length Total Equivalent Length

10) Length of Straight Secon in feet NA

Total (add up lines 1 through 10)

Equivalent Vent Length Calculaon Sheet Maximum equivalent vent lengths are specic to the fuel type of the water heater. It is imperave when performing vent calculaons the following be taken into consideraon: ATTENTION Vent Type Maximum Equivalent Vent Length 3” PVC/CPVC 41 Feet Concentric PP 41 Feet 4” PVC/CPVC 100 Feet Twin Pipe PP (Centrotherm) 41 Feet24 KCM Series Manual Determine the number of 90 degree elbows in the vent system. (two 45 degree elbows count as one 90 degree elbow.) Refer to the tables below to nd the maximum vent length based on the number of elbows and terminaon style. Maximum Equivalent Vent Length Tables: Maximum vent lengths are specic to the fuel type of the tankless water heater. It is imperave when performing equivalent vent length calculaons that the gas type be taken into consideraon. ATTENTION OPTION 2: Total Equivalent Vent Length (Intake/outlet) for Twin Pipe 3" PVC/CPVC Maximum Vent Length 41 Feet Terminaon Type IPEX Concentric Vent Kit Snorkel Terminaon Side Wall Tee Terminaon Low Prole Terminaon Terminaon Equivalent Length in feet (meters) (Already factored into the straight pipe lengths below) 20 (6.1) 15 (3.0) 5 (1.5) 5 (1.5) # of 90° Elbows (each: 5 equivalent feet) Max. straight pipe vent length in feet (meters) 0 21 (6.4) ** 26 (7.9) ** 36 (11.0) ** 36 (11.0) ** 1 16 (4.9) ** 21 (6.4) ** 31 (9.4) ** 31 (9.4) ** 2 11 (3.4) ** 16 (4.9) ** 26 (7.9) ** 26 (7.9) ** 3 6 (1.8) ** 11 (3.4) ** 21 (6.4) ** 21 (6.4) **

Total Equivalent Vent Length (Intake/outlet) for Twin Pipe 4" PVC/CPVC Maximum Vent Length 100 Feet Terminaon Type IPEX Concentric Vent Kit Snorkel Terminaon Side Wall Tee Terminaon Low Prole Terminaon Terminaon Equivalent Length in feet (meters) (Already factored into the straight pipe lengths below) 20 (6.1) 15 (3.0) 5 (1.5) 5 (1.5) # of 90° Elbows (each: 5 equivalent feet) Max. straight pipe vent length in feet (meters) 0 80 (24.4) ** 85 (25.9) ** 95 (29.0) ** 95 (29.0) ** 1 75 (22.9) ** 80 (24.4) ** 90 (27.4) ** 90 (27.4) ** 2 70 (21.3) ** 75 (22.9) ** 85 (25.9) ** 85 (25.9) ** 3 65 (19.8) ** 70 (21.3) ** 80 (24.4) ** 80 (24.4) ** 4 60 (18.3) ** 65 (19.8) ** 75 (22.9) ** 75 (22.9) ** 5 55 (16.8) ** 60 (18.3) ** 70 (21.3) ** 70 (21.3) ** 6 50 (15.2) ** 55 (16.8) ** 65 (19.8) ** 65 (19.8) ** **SW 1 in DIPSW 1 is “OFF” for lengths greater than or equal to 21 feetKCM Series Manual 25 Installaon of PVC/CPVC Vent and Intake Air Piping: Adapter Installaon Conguraons: Note the correct posion of the combuson air inlet and gas ue outlet, as these are NOT interchangeable. For the correct posion and design of the twin pipe gas ue outlet and combuson air inlet refer to the installaon instrucons in this manual. Required Parts For 3” PVC/CPVC Assembly Conguraon The RUCS series units do not require addional parts to be used with standard 3” 3rd party solid core PVC/ CPVC pipes; refer to gure below for required parts for 3” PVC/CPVC assembly conguraon. Required Parts For 4” PVC/CPVC Assembly Conguraon Conversely, the RUCS series units require 2 addional (4”x 3” Flush – Schedule 40 PVC) bushing to be used with 4” PVC/CPVC assembly conguraon (refer to gure below). WARNING Failure to correctly assemble the components according to these instrucons may result in property damage, personal injury, or death. 3” standard - wall white PVC/CPVC unthreaded pipe (SCH 40 sold core) 3” SCH 40 PVC/CPVC Elbows (female unthreaded socket ends) Exhaust Combuson Air Exhaust Adapter Ring (To remain, required for twin pipe conguraon) Intake Cap (To be removed and discarded for twin pipe conguraon) Components by others (displayed as example), not included with unit Included with Intake Cap (To be removed and discarded for twin pipe conguraon) Exhaust Adapter Ring (To remain, required for twin pipe conguraon) 3” standard - wall white PVC/CPVC unthreaded pipe (SCH 40 sold core) 4” SCH 40 PVC/CPVC Elbows (female unthreaded socket ends) Exhaust Combuson Air 4”X 3” ush bushing (SCH 40 PVC/CPVC) or any other reducer type ng Components by others (displayed as example), not included with unit Included with WARNING DO NOT apply PVC glues, solvents, or cleaners to the water heaters intake or exhaust gasket connecons.26 KCM Series Manual Cered PVC/CPVC Vent Terminaon Opons Vent Terminaon Conguraons There are 4 conguraons for vent terminaons that are approved for use with the RUCS series water heaters:

1. Concentric Terminaon (IPEX Concentric Vent Kit)

-Allows for only one penetraon through a wall or roof.

2. Snorkel Terminaon

-Allows for easier clearance above grade when having to terminate through a lower point

-Used for ush mount side wall applicaon only. Terminaon Installaon Exhaust and combuson air piping must be securely fastened to structure every 4 feet, to ensure dimensions shown in the Figures throughout this document are maintained. DO NOT strap vercal vent too ghtly as the strapping must permit the vent to move in the event of expansion and contracon. Straps are eld supplied. Use straps, clamps or equiva- lent that will not score or damage the pipe. Expansion and contracon should be addressed between appli- ance and terminaon point. All penetraons must be sealed according to local building codes. Caulking for side wall terminaons and ashing for roof penetraons are typical. Use only PVC/ CPVC compable sealing material. Contact PVC/CPVC manufacturer for a list of compable materials. IPEX Concentric Vent Kit (CVK) Installaon For installaons with mulple terminaons, maintain appropriate clearances between terminals. (Reference IPEX Concentric Vent Kit Clearance diagram) The pipe length of the concentric vent kit can be shortened; providing that the cung and cemenng procedures adhere to the System 636 guidelines; reference IPEX installaon instrucons for further informaon. Pipe lengths and/or ngs CANNOT be added to the socket of the rain cap in order to divert exhaust gas. Wall Terminaon Roof Terminaon WARNING Moisture in the ue gas will condense as it leaves the vent terminal. In cold weather this condensate can freeze on the exterior wall, under the eaves, and on surrounding objects. Some discoloraon to the exterior of the building is to be expected. However, improper locaon or installaon can result in damage to the structure or exterior nish of the building. WARNING Danger of re or bodily injury – Solvent cements and primers are highly ammable. Provide adequate venlaon and do not assemble near a heat source or open ame. Do not smoke. Avoid contact with the skin or eyes. Observe all cauons and warnings on material containers.KCM Series Manual 27 MECHANICALLY FASTENED RAIN CAP: The Rain Cap must be installed with the supplied Stainless Steel screw and lock nut, and in accordance with the instrucons and diagram below.

1. Locate the drill locaon dimple on the outside of the

2. At this locaon, drill through the cap and the inner

pipe wall. Ensure that the path of the hole is perpendicular to the inner pipe NOT the outside of the cap. For the 3” kit, drill a 3/16” hole, for the 4” kit, drill a 1/4” hole. Clean any resulng debris.

1. Once the proper locaon has been determined, cut a

hole in the roof or wall large enough to accommodate the outer pipe. The size of the hole can vary greatly depending on the roof pitch.

2. As per the procedures outlined, solvent cement the

inner pipe to the concentric Wye ng.

3. Solvent cement the outer pipe to the concentric Wye

4. Slide the assembly through the roof or wall

penetraon. (Install ashing as required)

5. To permanently ax the rain cap, it should be

solvent cemented to the inner pipe. For installaons where removal of the cap may be required for service or cleaning the cap, it can be fastened mechanically (see instrucons). For either installaon method, the outer pipe is only a fricon t with the cap. Twin Pipe to Concentric Terminaon Physical Data Cered PVC/CPVC Vent Terminaon Opons (connued)28 KCM Series Manual

Vent spacing depicted above is specic to the IPEX PVC/CPVC- FGV Concentric Vent Kit ; for required spacing for all other terminaon types refer to subsequent pages of this manual.

Reference the “General Clearance Requirements” secon of this manual for important consideraons for locang vent terminaon under a sot (venlated or unvenlated), eave, or deck/porch.

1. Install the water heater.

3. Determine proper locaon for wall or roof

penetraon for each terminaon.

4. Install terminaon assembly as described in this

5. Install air and vent piping from water heater to

6. Slope horizontal exhaust run towards the water heater 1/4”

per foot. DO NOT slope combuson air pipe towards unit. Be sure to dispose of condensate per local codes.

7. Install pipe supports and brackets every 4 feet allowing for

movement from expansion or as per local code requirements.30 KCM Series Manual The following informaon should be used in conjuncon with the IPEX System 636 Installaon Guide: Terminaon kits are to be tested and cered for use with the brand of pipe-ng-cement system that is to be ulized in the applicaon. The IPEX Low Prole terminaon is fully cered for use with IPEX product only. System 636 PVC Low Prole Vent kits are rated to 65°C maximum and are made from cered compound. All terminaon kits must be located and installed in accordance with these instrucons, local building code, and CSA B149.1 Natural Gas and Propane Installaon Code. All exhaust vents and air inlets must terminate at the same height to avoid property damage, personal injury, or death. 3” and 4” Low Prole Vent Terminaon Kits Cered PVC/CPVC Vent Terminaon Opons (connued) Installaon:

1. Once a proper locaon has been determined, cut 2

appropriately sized holes in the wall to accommodate the pipe. (Reference the Low Prole Terminaon Kit-Dimensions table below)

2. Slide intake and exhaust pipes through the holes.

Secure (using solvent cement) both pipes to the base of the vent terminaon kit. (Be sure to follow guidelines for solvent cemenng as described in the System 696 Installaon Guide)

3. Use the supplied screws and anchors to secure the

base to the wall. (a drilled 3/16” hole, 1-3/16” deep will be needed for the anchors.) Use the base as a template to locate the anchor hole.

4. Using the supplied screws, secure the Cap to the Base.

5. Upon securing the vent terminaon and pipes, seal the

wall penetraons (from the interior) using a PVC compable sealant material. Item # Descripon Pipe Outside Diameter Hole Spacing (Ctr to Ctr)

1. The total length of the vent or intake air piping must

not exceed the limits given in maximum equivalent vent length tables. The equivalent length for 90° elbows and terminaon associated with the respecve vent and intake air piping arrangement MUST be subtracted from total length listed in maximum equivalent vent tables.

2. Specic to Side Wall Tee Terminaon, the vent and

intake air piping must terminate at the outside surface of the outer wall, minimum 1” between wall, tee, and elbow socket ends.

3. Terminaon must be installed a minimum of 12” (30.5

cm), above grade or ancipated snow level.

5. The intake air pipe must terminate away from the vent

terminaon. Both vent and air intake pipe terminaons must be installed a minimum of 12” (30.5 cm) above grade or highest ancipated snow level and as shown in gures to the right. If the vent is terminated on a sidewall that is subject to high winds it is recommended to terminate the vent using a tee. A tee provides the best protecon against wind. NOTE The informaon and gures depicng method of terminang the vent and combuson air intake pipes are directly related to PVC/CPVC vent systems. When ulizing a method other than a PVC/CPVC vent system there may be some variaons. Consult the respecve vent manufacturer or the water heater manual for recommendaons and claricaons. Twin Pipe (PVC/CPVC) Terminaons NOTICE Cered PVC/CPVC Vent Terminaon Opons (connued) Slope horizontal exhaust piping downward toward the water heater a minimum of 1/4 inch per foot. DO NOT slope combuson air piping down towards water heater. Dispose of condensate per local codes. NOTICE Sidewall Vent and Combuson Air Piping with Tee Terminaon 12” above grade or ancipated snow level 12” 12” min 1” min. between wall & socket end Exhaust Vent Combuson Air Sidewall Vent and Combuson Air Piping with Snorkel Terminaon 12” min Exhaust Vent Combuson Air Exhaust Vent Combuson Air Wall 12” min 12” above grade or ancipated snow level (Picture shown is for illustraon purposes only; listed equivalent length is based on worst case scenario of 3 X 90

1. For installaons with mulple Tankless Water Heaters,

refer to Figure 16 for proper exhaust and combuson air piping placement.

2. Roof penetraon of the vent and intake air piping

should be such that the combuson air intake is a minimum 12” (30.5 cm) from the adjacent vent pipe of the other water heater. For installaons in the U.S. refer to Figure 16. For installaons in Canada, refer to clearances required by CAN/CSA B149.1. Vercal Terminaon of U-Vent and Combuson Air Pipe PVC/CPVC Roof (Tee and upside down “U”) Terminaons: Locate the vent and intake air terminaon using the following guidelines:

1. The total length of the vent or intake air piping must

not exceed the limits given in maximum equivalent vent length tables. The equivalent length for 90° el- bows and terminaon associated with the respecve vent and intake air piping arrangement MUST be subtracted from the total length listed in maximum equivalent vent length tables.

2. For roof terminaons installed as shown in the gures

to the right, the intake air piping must terminate using a tee or combinaon of elbows. The terminaon must be installed 12” (30.5 cm) above roof or the highest ancipated snow level.

3. The vent must terminate vercally with a coupling to

facilitate the bird screen and must be located 12” (30.5 cm) minimum above the combuson air inlet.

4. The vent and intake air terminaons must be

located a radial distance of 12” minimum (30.5 cm) from outer wall of vent terminaon to outer wall of combuson air intake terminaon. Vercal Terminaon of Tee-Vent and Combuson Air Pipe Vercal Terminaon of Mulple Water Heaters Cered PVC/CPVC Vent Terminaon Opons (connued) All gures shown in this secon are in reference to at roofs. For heights of venng passing through a pitched roof, refer to NFPA 54/ANSI Z223.1-09 (table and gure

12.7.2), CSA B149.1-10 (gure 8.1) Pitched Roof

Terminaon Clearances Diagram (this manual) NOTE 12” min above air intake opening 12” min 12” above grade or ancipated snow level Vent Terminaon Combuson air terminaon 12” min above air intake opening 12” above grade or ancipated snow level Vent Terminaon Combuson air terminaon 12” min 12” min 12” min above air intake opening 12” above grade or ancipated snow level Combuson Air Terminaon Exhaust Vent Terminaon 12” minKCM Series Manual 33 Pitched Roof Terminaon Clearances: Basic Instrucons for Cemenng Joints:

1. Cut pipe end square; smooth out jagged edges and

burrs. Chamfer end of pipe; then clean ng socket and pipe joint area of all dirt, grease, or moisture.

2. Aer checking pipe and socket for proper t, wipe

socket and pipe with cleaner-primer. Apply a liberal coat of primer to inside surface of socket and outside of pipe. Vercal Terminaon of U-Vent and Combuson Air Pipe on a Pitched Roof Cered PVC/CPVC Vent Terminaon Opons (connued) To prevent the possibility of condensate freeze-up, do not install vent kits one above the other. Once the vent terminal locaon has been determined, make holes through the exterior wall to accommodate the vent pipes. Vent pipes must exit exterior wall horizontally only. NOTE 12” above roof or ancipated snow level 12” min 12” min Exhaust Vent Combuson Air DO NOT use lubricant between two PVC/CPVC components. Refer to cement manufacturer instrucon for specic instrucons and handling. NOTE

3. Apply a thin coat of cement evenly in the socket.

Quickly apply a heavy coat of cement to the pipe and insert pipe into ng with a slight twisng moon unl it booms out.

4. Hold the pipe ng for 30 seconds to prevent the

tapered socket from pushing the pipe out of the ng.

5. Wipe all excess cement from the joint with a rag. Allow

15 minutes before handling. Cure me will vary according to t, temperature, and humidity34 KCM Series Manual Parts Informaon Types of Acceptable PVC/CPVC Elbows for Venng System

ACCEPTABLE ACCEPTABLE NOT ACCEPTABLE

WARNING Improper installaon of vent system and components, or failure to follow all installaon instrucons, can result in property damage, personal injury, or death.KCM Series Manual 35 Vent Components and Assigned Equivalent Lengths: The following ngs and accessories (by others) are cered for use with the abovemenoned condensing products: Approved PVC/CPVC Terminaon Components OEM OEM # or Cert. Product Descripon Diagram Equivalent Lengths (Ft.) IPEX (Purchased separately ) 196006 /197009 (3 Inch) 196021 /197021 (4 Inch) (System 636)

Concentric Vent Kit w/ vent screen

IPEX (Purchased separately )

Field Supplied PVC/CPVC Sch. 40 Fings or Ap- proved Equal Comply with CAN/CGA B149.1 & ULC-S636 3” and 4” SCH 40 (Solid Core) PVC/CPVC TEE w/ vent screen

Field Supplied PVC/CPVC Sch. 40 Fings or Ap- proved Equal Comply with CAN/CGA B149.1 & ULC- S636 3” and 4” SCH 40 (Solid Core) PVC/CPVC 90° EL w/ vent screen

Field Supplied PVC/CPVC Sch. 40 Fings or Ap- proved Equal Comply with CAN/CGA B149.1 & ULC- S636 3” and 4” SCH 40 (Solid Core) PVC/CPVC 45° EL w/ vent screen

IPEX (Purchased separately )

(4 Inch) Fricon t vent screen (3” and 4”)

Field Supplied PVC/CPVC Sch. 40 Fings or Approved Equal Comply with CAN/CGA B149.1 & ULC-S636 3” and 4” SCH 40 (Solid Core) PVC/CPVC Snorkel vent w/ vent screen (2X90° or 2X90° EL + 1X45° EL)

Vent screens are not ULC S636 Cered. Fricon t vent screens inside terminaon ng are used to avoid debris and/or small animals from entering vent. Primer shall be used when installing System 636® and other PVC/CPVC products at temperatures below 32

C). Primer is required in some jurisdicons regardless of temperature, verify with your local authority having jurisdicon. Use only System 636 cements and primers; substung other cements and primers will void IPEX’s cercaon and warranty; (see OEM’s literature). For Schedule 40 PVC/CPVC, any glue and primer approved by your local authority having jurisdicon may be substuted. Parts Informaon (connued)36 KCM Series Manual PVC/CPVC Equivalent Vent Length Calculaon Sheet Note: Ensure SW 1 in DIPSW 1 is in “OFF” posion if vent length is greater than 21 (6.4m). Fing / Terminaon Type Number of ngs Equivalent Vent Length Total Equivalent Length

10) Length of Straight Secon in feet NA

Total (add up lines 1 through

Equivalent Vent Length Calculaon SheetKCM Series Manual 37 Condensate Condensate can form in high eciency direct vent appliances. Without proper drainage, condensate will damage the heat exchanger. To prevent condensate damage, follow these instrucons. DO NOT Do not connect the condensate drain pipe directly to the rain sewer. Do not connect the condensate drain line with an air condioning evaporator coil drain. MUST DO Use only venng that is approved and idened as acceptable for your parcular model. Slope the venng toward the appliance according to the vent manufacturer’s installaon instrucons. All condensate must drain and be disposed of according to local codes. Use only corrosion resistant materials for the condensate drain lines such as PVC pipe or plasc hose. The condensate drain pipe (along its enre length) must be at least the same diameter as the drain line, (1/2 inch NPT). The end of the condensate drain pipe should be open to the atmosphere. The end should not be under water or other substances. To minimize freezing of the condensate in outdoor units, run the condensate drain line through an interior wall or between insulaon and an interior wall. It is recommended that the condensate trap drain line be insulated. A frozen condensate trap results in a diagnosc code 25. Checklist for Venng and Condensate (indoor models only) □ Verify proper clearances around the vents and air intakes. □ For indoor models, ensure SW4 in DIPSW2 is set to the appropriate venng style. □ Ensure you have used the correct venng products for the model installed and that you have completely followed the venng manufacturer’s installaon instrucons and these installaon instrucons. □ Verify that the vent system does not exceed the maximum length for the number of elbows used. INFORMATION Water heaters have an integrated condensate collector. Regions of cold climate will create more condensate in the vent system. The condensate drain pipe should be as short as possible and have a downward pitch. If the condensate drain gets blocked, a diagnosc code will display on the controller or status monitor. If this occurs, the condensate drain must be cleaned. The condensate trap will automacally prime (self- prime) during operaon of the unit as condensate forms. Condensate draining from the unit indicates that the trap is full and that there is no blockage in the condensate drain. It is not necessary to add water to the condensate trap. A condensate neutralizer kit, 804000074, is available from Rinnai. The kit allows condensate to ow through neutralizing media that raises the pH of the condensate to a level that will help prevent corrosion of the drain and public sewer system.38 KCM Series Manual Installaon of Plumbing A manual water control valve must be placed in the water inlet connecon to the water heater before it is connected to the water line. Unions may be used on both the hot and cold water lines for future servicing and disconnecon of the unit. DO NOT Do not introduce toxic chemicals such as those used for boiler water treatment to the potable water used for space heang. MUST DO The piping (including soldering materials) and components connected to this appliance must be approved for use in potable water systems. Purge the water line to remove all debris and air. Debris will damage the water heater. If the appliance will be used as a potable water source, it must not be connected to a system that was previously used with a non-potable water heang appliance. Ensure that the water lter on the water heater is clean and installed. Piping Requirements Pressure Relief Valve Requirements A pressure relief valve must be installed according to these instrucons. An approved pressure relief valve is required by the American Naonal Standard (ANSI Z21.10.3) for all water heang systems and shall be accessible for servicing. DO NOT Do not plug the relief valve and do not install any reducing ngs or other restricons in the relief line. The relief line should allow for complete drainage of the valve and the line. Do not place any other type valve or shuto device between the relief valve and the water heater. MUST DO The relief valve must comply with the standard for Relief Valves and Automac Gas Shuto Devices for Hot Water Supply Systems ANSI Z21.22 and /or the standard Temperature, Pressure, Temperature and Pressure Relief Valves and Vacuum Relief Valves, CAN1-4.4. The relief valve must be rated up to 150 psi and to at least the maximum BTU/hr of the appliance. The discharge from the pressure relief valve should be piped to the ground or into a drain system per local codes. The pressure relief valve must be manually operated once a year to check for correct operaon. The relief valve should be added to the hot water outlet line and near the hot water outlet according to the manufacturer’s instrucons. DO NOT place any other type valve or shut o device between the relief valve and the water heater. INFORMATION If a relief valve discharges periodically, this may be due to thermal expansion in a closed water supply system. Contact the water supplier or local plumbing inspector on how to correct this situaon. Do not plug the relief valve. The American Naonal Standard (ANSI Z21.10.3) does not require a combinaon temperature and pressure relief valve for this appliance. However, local codes may require a combinaon temperature and pressure relief valve. Isolaon Valves Rinnai strongly recommends the installaon of isolaon valves on the cold and hot water lines because they provide the ability to isolate the water heater from the structure’s plumbing and allow quick access to ush the heat exchanger. Flushing the heat exchanger regularly is required as part of the proper maintenance for this water heater.

Water discharged from the pressure relief valve could cause severe burns instantly or death from scalds. WARNINGKCM Series Manual 39 Isolaon Valves and Pressure Relief Valve (PRV) The isolaon valves provide the ability to isolate the water heater from the structure’s plumbing and allow quick access to ush the heat exchanger. Check with local codes to determine if a pressure and temperature relief valve is required. The valves must meet American Naonal Standard (ANSI Z21.10.3) / Canadian Standard (CSA 4.3) and are ANSI/NSF 61 approved for potable water. Isolaon Valves Installaon Instrucons:

1. Wrap the ends of the threaded water inlet and

outlet on the tankless water heater, as well as the threaded end of the approved pressure relief valve with a minimum of 5 wraps of Teon® tape.

2. Screw the pressure relief valve into the 3/4”

threads opposite the wing handle on the HOT water service valve. (RED drain handle) (see Pressure Relief Valve Secon for proper installaon requirements)

3. Loosen the 3/4” union nut on the HOT water

valve and connect to the HOT water outlet on the tankless water heater. If nut is removed, ensure that you realign the tailpiece accurately to the valve and that the black washer is posioned such that the raised metal edge of the valve is inside the washer.

4. Align the direcon of the HOT water drain to the

5. Tighten the union assembly to the HOT water

valve using approximately 15 foot lbs of torque.

6. Repeat steps 3-5 for the COLD water valve.

(BLUE drain handle) for connecon to the COLD water inlet on the tankless water heater.

7. Connect the INLET on the COLD water valve to

the MAIN SOURCE of the water supply.

8. Connect the OUTLET on the HOT water valve to

the HOT WATER plumbing system.

9. Ensure that both drain valve lever handles are in

the closed posion (perpendicular to the drain poron of the body). Pressure Relief Valve Installaon Instrucons: The PRV must be connected to the 3/4” threaded port on the HOT (RED) water service valve (will be adjacent to or above the shut o, never below). Installaon must maintain a 3/4” port size with no shut o valve or line restricon in-between the appliance and the PRV. The discharge line from the PRV should pitch downward and terminate 6” above drains where discharge will be clearly visible. The discharge end of the line shall be plain (unthreaded) and a minimum of 3/4” in diameter. The discharge line material must be suitable for water at least 180° Fahrenheit. No valve of any type may be installed in the discharge line of the pressure relief valve. Pressure Relief Valve Maintenance: For proper care of this approved pressure relief valve, it is recommended that the valve is manually operated once a year. In doing so, it will be necessary to take precauons with regard to the discharge of potenally scalding hot water under pressure. Ensure discharge water has a safe place to ow. Contact may cause property damage and/or bodily harm. Please note PRV must be rated for up to 150 psi and at least the maximum BTU/hr of the appliance. A Pressure Relief Valve (PRV)* B PRV Discharge Outlet* C Hot Drain Valve* D Cold Drain Valve* E Hot Ball Valve* F Cold Ball Valve*

When unscrewing the UNION FITTING, Be careful not to lose any washers and/or gaskets that may be present. NOTICE *Not Included40 KCM Series Manual Piping Diagram for Basic Installaon The condensate drain pipe (along its enre length) must be at least the same diameter as the drain line, (1/2 inch NPT). Refer to the Condensate secon in the venng instrucons Condensate Drain Line 3/4” Gas Connecon Condensate Drain Gas Supply For Building Fixtures 3/4” Cold Water Supply Line Water drain plug Condensate drain line Gas connecon Cold water inlet Hot water outlet 3/4” Hot Water Supply LineKCM Series Manual 41 Connect Water Heater to Water Supply Water connecons to the tankless water heater should follow all state and local plumbing codes. If this is a standard installaon, refer to the Piping Diagram for Basic Installaon.

1. Plumb water supply to the tankless water heater

on the 3/4” MNPT connecon at the boom of the unit marked “Water Inlet”, which is the cold water supply.

2. Plumb the building hot water supply to the 3/4”

MSPT connecon marked “Water Outlet”, which is the hot water supply. If a pipe cover will be installed, make sure water lines to the water heater t. Checklist for Plumbing □ Purge the water line of all debris and air by closing the hot isolaon valve and opening the cold isolaon valve and its drain. Debris will damage the water heater. Use a bucket or hose if necessary. □ Ensure that hot and cold water lines are not crossed to the unit and are leak free. □ Ensure that a pressure relief valve is properly installed with a rang that exceeds the BTU input of the water heater model. Refer to the rang plate on the side of the water heater for BTU input. □ Clean the inlet water lter by closing the cold and hot water inlet isolaon (shut-o) valves. Put a bucket under the lter at the boom of the water heater to catch any water that is contained inside the unit. Unscrew the water lter. Rinse the lter to remove any debris. Install the lter and open the isolaon valves. □ Check for proper water pressure to the water heater. Minimum water pressure is 50 psi. Rinnai recommends 60-80 psi for maximum performance. □ Ensure any issues regarding water quality have been properly addressed. Installaon of Gas Supply MUST DO A manual gas control valve must be placed in the gas supply line to the water heater. A union can be used on the connecon above the shut o valve for the future servicing or disconnecon of the unit. Check the type of gas and the gas inlet pressure before connecng the water heater. If the water heater is not of the gas type that the building is supplied with, DO NOT connect the water heater. Contact the dealer for the proper unit to match the gas type. Check the gas supply pressure immediately upstream at a locaon provided by the gas company. Supplied gas pressure must be within the limits shown in the Specicaons secon of this manual with all gas appliances operang. Before placing the appliance in operaon, all joints including the heater must be checked for gas ghtness by means of leak detector soluon, soap and water, or an equivalent nonammable soluon, as applicable. (Since some leak test soluons, including soap and water, may cause corrosion or stress cracking, the piping shall be rinsed with water aer tesng, unless it has been determined that the leak test soluon is non- corrosive.) Use approved connectors to connect the unit to the gas line. Purge the gas line of any debris before connecon to the water heater. General Instrucons WARNING

1. A licensed professional must install the gas

2. Turn o 120v power supply.

4. Gas is ammable. Do not smoke or provide other

ignion sources while working with gas.

5. Do not turn on the water heater or gas unl all

fumes are gone.42 KCM Series Manual Size the gas pipe The gas supply must be capable of handling the enre gas load required at the locaon. Gas line sizing is based on gas type, the pressure drop in the system, the gas pressure supplied, and gas line type. For gas pipe sizing in the United States, refer to the Naonal Fuel Gas Code, NFPA 54. The below informaon is provided as an example. The appropriate table from the applicable code must be used.

1. For some tables, you will need to determine the

cubic feet per hour of gas required by dividing the gas input by the heang value of the gas (available from the local gas company). The gas input needs to include all gas products at the lo- caon and the maximum BTU usage at full load when all gas products are in use.

2. Use the table for your gas type and pipe type to

nd the pipe size required. The pipe size must be able to provide the required cubic feet per hour of gas or the required BTU/hour. Example: The heang value of natural gas for your locaon is 1000 BTU/FT

. The gas input of the RUCS75i is 160,000 BTU/HR. Addional appliances at the loca- on require 65,000 BTU/hr. Therefore the cubic feet per hour = (160,000 + 65,000) / 1000 = 165 FT

/HR. If the pipe length is 10 feet then the 3/4 inch pipe size is capable of supplying 264 FT

/HR of natural gas. Gas Input of all gas products (BTU / HR) Heang Value of Gas (BTU / FT

Cubic Feet per Hour = (CFH) Any compound used on the threaded joint of the gas piping shall be a type that resists the acon of liqueed petroleum gas (propane / LPG). The gas supply line shall be gas ght, sized, and so installed as to provide a supply of gas sucient to meet the maximum demand of the heater and all other gas consuming appliances at the locaon without loss of pressure. INFORMATION If in doubt about the size of the gas line, refer to an approved pipe sizing chart Length Pipe Size (inches) 3/4 1 1 1/4 1 1/2

Pipe Sizing Table - Natural Gas Inlet Pressure: less than 2 psi (55 inches W.C.) Pressure Drop: 0.3 inches W.C. Specic Gravity: 0.60 Schedule 40 Metallic Pipe cubic feet per hour Length Pipe Size (inches) 1/2 3/4 1 1 1/4

Pipe Sizing Table - Propane Gas Inlet Pressure: 11.0 inches W.C. Pressure Drop: 0.5 inches W.C. Specic Gravity: 1.50 Schedule 40 Metallic Pipe Capacity in Thousands of BTU per HourKCM Series Manual 43 Connect Electricity Do not rely on the gas or water piping to ground the water heater. A screw is provided in the juncon box for the grounding connecon. The water heater requires 120 VAC, 60 Hz power from a properly grounded circuit. If using the 5 foot long power cord, plug it into a standard 3 prong 120 VAC, 60 Hz properly grounded wall outlet. On outdoor models, a disconnect switch must be provided and installed for the incoming 120 VAC power. It should be a type that is suitable for outdoor use. Check the Naonal Electrical Code, ANSI/NFPA 70 and your local codes for a proper switch type to use in your area. The wiring diagram is located on the Technical Sheet aached to the inside of the front cover. WARNING Do not use an extension cord or an adapter plug with this appliance. The water heater must be electrically grounded in accordance with local codes and ordinances or, in the absence of local codes, in accordance with the Naonal Electrical Code, ANSI/NFPA No. 70. Indoor water heaters are equipped with a three- prong (grounding) plug for your protecon against shock hazard and should be plugged directly into a properly grounded three-prong receptacle. Do not cut or remove the grounding terminal from this plug. Adjustment for High Altude Installaons Set SW3 in DIPSW 1 to the values shown in table below for your altude. The default seng for the appliance is 0-2000 (0-610 m) with switches SW3 in the OFF posion. When the DIP switch is adjusted, it is not necessary to adjust the gas pressure seng for high altude. Altude SW3 in DIPSW 1 0-2000 (0-610 m) OFF 2001-5400 (610-1646 m) ON Checklist for Gas and Electricity □ A manual gas control valve is placed in the gas line to the water heater. □ Check the gas lines and connecons for leaks. □ Conrm that the gas inlet pressure is within limits. □ Conrm that the water heater is rated for the gas type supplied. □ Conrm that the electricity is supplied from 120 VAC, 60 Hz power source and is in a properly grounded circuit. □ Conrm that an extension cord or an adapter plug has NOT been used with the water heater. Adjustment for Vent Length (indoor models only) Adjust SW 1 in DIPSW 1 if required. Refer to the secon “Maximum vent length”. 120V Wiring Blue or Black wire: hot leg Brown or White Wire: neutral Cable Clamp Remote Control Cable Cable Clamp Remote Control Connecon Terminals DIPSW 1 DIPSW 2 Ground Screw Status Monitor44 KCM Series Manual Installaon of Oponal Temperature Controller Controller Locaon Cable Lengths and Sizes The controller should be out of reach of small children. Avoid locaons where the controller may become hot (near an oven or radiant heater). Avoid locaons in direct sunlight. The digital display may be dicult to read in direct sunlight. Avoid locaons where the temperature controller could be splashed with liquids. Do not install in locaons where the controller can be adjusted by the public. The cable for the temperature controller should be a non-polarized two-core cable with a minimum gauge of 22 AWG. The maximum cable length from each controller to the water heater depends on the total number of wired controllers connected to the water heater. Number of Wired Controllers Maximum Cable Length for each Controller to Water Heater 1 328 (100 m) 2 164 (50 m) 3 or 4 65 (20 m) Turn the power o. Do not aempt to connect the temperature controller(s) with the power on. Although the controller is a low voltage device, there is 120 volt potenal next to the temperature controller connecons inside the unit. Do not connect the temperature controller to the 120VAC terminals provided for the oponal solenoid drain valves. WARNING Conguraons A maximum of 4 temperature controllers can be installed for a water heater or bank of water heaters. Controllers can only be wired in parallel. Controllers cannot be wired in series. The 4 temperature controllers can consist of mulple MC-91-2. (MC-91-1 should not be installed on a unit that already has an MC-91-2 connected) If 4 MC-91-2’s are installed, simultaneously press the Priority and On/O buons on the fourth controller unl a beep sounds. Do not install MC-100V and BC-100V. Wire controllers in parallel The units referenced in this manual do not include a temperature controller.KCM Series Manual 45 Mounng the controller

1. Make three holes in the wall as shown.

2. Run the cable between the controller and the

water heater or the controller and another controller.

3. Remove the face plate from the temperature

controller using a screwdriver.

4. Connect the cable to the temperature controller.

5. Mount the controller to the wall using the holes

6. Disconnect the power from the water heater.

7. Remove the plasc cover from the PCB and

electrical connecons.

8. Thread the cable through the access hole at the

base of the unit and connect the wires to the controller terminals on the right hand side boom of the PCB.

the cover of the water heater. Outline of Remote securing screw 1-21/32" 3-5/16" securing screw wiring hole Cable Clamp Remote Control Cable Remote Control Connecon Terminals Once Installaon is complete, install the front panel and cycle the unit on to ensure it is funconing correctly. Proper installaon/operaon of the unit is with the front panel installed. DIPSW 1 DIPSW 2 Status Monitor46 KCM Series Manual Final Checklist □ The water heater is not subject to corrosive compounds in the air. □ Water supply does not contain chemicals or exceed total hardness referenced in manual. □ Clearances from the water heater unit are met. □ Clearances from vent terminaon are met. □ For indoor models, ensure you have used the correct venng products for the model installed and that you have completely followed the venng manufacturer’s installaon instrucons and these installaon instrucons. □ For indoor models, verify that the vent system does not exceed the maximum length for the number of elbows used. □ For indoor models, verify that SW 1 in DIPSW 1 has been adjusted for vent length if necessary. Refer to the secon on Maximum Vent Length. □ For indoor models, ensure SW4 in DIPSW 2 is set to the appropriate venng style. □ Purge water line of all debris and air by closing hot isolaon valve and opening the cold isolaon valve and its drain. Debris will damage the water heater. Use a bucket or hose if necessary. □ Ensure that hot and cold water lines are not crossed to the unit and are leak free. □ A manual gas control valve has been placed in the gas line to the water heater. □ Ensure a pressure relief valve is properly installed with a rang that exceeds the BTU input of the water heater model. Refer to the rang plate on the side of the water heater for BTU input. □ Clean the inlet water lter by closing the cold and hot water inlet isolaon (shut-o) valves. Put a bucket under the lter at the boom of the water heater to catch any water that is contained inside the unit. Unscrew the water lter. Rinse the lter to remove any debris. Install the lter and open the isolaon valves. □ Check the gas lines and connecons for leaks. □ Conrm that the gas inlet pressure is within limits. □ Conrm that the water heater is rated for the gas type supplied. □ Conrm that the electricity is supplied from a 120 VAC, 60 Hz power source, is in a properly grounded circuit, and turned on. □ Verify the temperature controller or status monitor is funconing properly. □ Verify that SW3 in DIPSW 1 is set correctly for your altude. □ Verify the system is funconing correctly by connecng your manometer to the gas pressure test port on the water heater. Operate all gas appliances in the home or facility at high re. The inlet gas pressure at the water heater must not drop below that listed on the rang plate. □ DO NOT introduce toxic chemicals such as those used for boiler water treatment to the potable water used for space heang. □ If the water heater is not needed for immediate use, drain the water from the heat exchanger. □ Install the front panel. □ Explain to the customer the importance of not blocking the vent terminaon or air intake. □ Explain to the customer the operaon of the water heater, safety guidelines, maintenance, and warranty. □ The installaon must conform with local codes or, in the absence of local codes, with the Naonal Fuel Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas and Propane Installaon Code, CSA B149.1. If installed in a manufactured home, the installaon must conform with the Manufactured Home Construcon and Safety Standard, Title 24 CFR, Part 3280 and/or CAN/SCA Z240 MH Series, Mobile Homes. □ Inform the consumer if the isolaon valves are not installed or if a water soening system is not installed. □ Leave the enre manual taped to the water heater (indoor units) or give the enre manual directly to the consumer.KCM Series Manual 47 Technical Data Specicaons

• Minimum ow may vary slightly depending on the temperature seng and the inlet water temperature. Minimum acvaon ow is 0.4 GPM (1.5 L/min). Our products are connually being updated; therefore, specicaons are subject to change without prior noce. The maximum inlet gas pressure must not exceed the value specied by the manufacturer. The minimum value listed is for the purpose of input adjustment. RUCS65i RUCS75i RUS65e RUS75e Minimum Gas Consumpon Btu/h 10,300 Maximum Gas Consumpon Btu/h 130,000 160,000 130,000 160,000 Hot water capacity (Min - Max) * 0.26 - 6.5 GPM (1.0 - 25.7 L/min) 0.26 - 7.5 GPM (1.0 - 28.7 L/min) 0.26 - 6.5 GPM (1.0 - 25.7 L/min) 0.26 - 7.5 GPM (1.0 - 28.7 L/min) Temperature Seng (no controller) 120° F (49° C), 125° F (52° C), 135° F (57° C), 140° F (60° C) Maximum Temp Seng 140° F (60° C) Minimum Temperature Seng 120° F (49° C) Weight 57.3 lb (26 kg) Noise level 47 dB 55 dB Electrical Data Normal 89 W 61 W Standby 1.3 W An-frost Protecon 167 W 140W Max Current 2.3 A Fuse 10 A Gas Supply Pressure Natural Gas 4.0 - 10.5 inch W.C. Propane 8.0 - 13.5 inch W.C. By-Pass Control Fixed Type of Appliance Condensing, Tankless, Temperature controlled connuous ow gas hot water system Connecons Gas Supply: 3/4" MNPT, Cold Water Inlet: 3/4" MNPT, Hot Water Outlet: 3/4" MNPT Ignion System Direct Electronic Ignion Electric Connecons Appliance: AC 120 Volts, 60Hz. Temperature Controller: DC 12 Volts (Digital) Water Temperature Control Simulaon Feed forward and Feedback Water Supply Pressure Minimum Water Pressure: 50 PSI (Recommended 60-80 PSI for maximum performance) Maximum Water Supply Pressure 150 PSI Remote Control Cable Non-Polarized Two Core Cable (Minimum 22 AWG) Energy Star Qualied Yes Cered for installaon in manufactured (mobile) homes Yes Complies with South Coast Air Quality Management District 14 ng/J or 20 ppm NOx emission levels Yes48 KCM Series Manual Dimensions

B C E F G JKCM Series Manual 49 Pressure Drop and Water Flow Curves The chart below only applies to incoming water temperatures of 70°F (21°C) or less. For incoming water temperatures greater than 70°F (21°C) please contact Rinnai. NOTICE RUCS75i, RUS75e Pressure Loss ( head) Water Flow (gpm) Pressure Loss (psi) RUCS65i, RUS65e Water Flow (gpm) delta T - Temperature Rise (°F) RUCS75i, RUS75e RUCS65i, RUS65e50 KCM Series Manual Ladder DiagramKCM Series Manual 51 Direct Vent Tankless Water Heater Operaon Instrucons Important Facts about your Water Heater Thank you for purchasing a Rinnai Tankless Water Heater. For proper operaon and safety, it is important to follow the instrucons and adhere to all safety precauons. Read all of the instrucons and the warranty thoroughly before operang this water heater. Keep this manual in a safe place. NOTICE: Rinnai somemes shares customer contact informaon with businesses that we believe provide products or services that may be useful to you. By providing this informaon, you agree that we can share your contact informaon for this purpose. If you prefer not to have your informaon shared with these businesses, please contact customer service and ask not to have your informaon shared. We will however, connue to contact you with informaon relevant to the product(s) you registered and/or you account with us. — Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other appliance. — WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance. Do not touch any electrical switch; do not use any phone in your building. Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instrucons. If you cannot reach your gas supplier, call the re department. — Installaon and service must be performed by a licensed professional. If the informaon in these instrucons is not followed exactly, a re or explosion may result causing property damage, personal injury, or death. WARNING

A. This appliance does not have a pilot. It is equipped with an ignion device which automacally lights the burner. Do not try to light the burner by hand. B. BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the oor because some gas is heavier than air and will sele on the oor. WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance. Do not touch any electric switch; do not use any phone in your building. Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instrucons. If you cannot reach your gas supplier, call the re department. C. Use only your hand to push in or turn the gas control knob. Never use tools. If the knob will not push in or turn by hand, do not try to repair it, call a licensed professional. Force or aempted repair may result in a re or explosion. D. Do not use this appliance if any part has been under water. Immediately call a licensed professional to inspect the appliance and to replace any part of the control system and any gas control which has been under water.

TO TURN OFF GAS TO APPLIANCE

1. Turn o all electric power to the appliance using

2. Set the thermostat to lowest seng.

3. Locate the manual gas valve on the side of the

heater. Turn the manual valve clockwise to the full OFF posion. OPERATING INSTRUCTIONS

1. STOP! Read the safety informaon above.

2. Set the thermostat to lowest seng.

3. Turn o all electric power to the appliance using

4. This appliance is equipped with an ignion device

which automacally lights the burner. Do not try to light the burner by hand.

5. Locate the manual gas valve on the side of the

heater. Turn the manual valve clockwise to the full OFF posion.

6. Wait ve (5) minutes to clear out any gas. Then

smell for gas, including near the oor. If you smell gas, STOP! Follow “B” in the safety informaon above. If you don’t smell gas, go to the next step.

7. Turn the manual gas valve counterclockwise to the

8. Turn on all electric power to the appliance using

9. Set the thermostat to desired seng.

10. Open a hot water tap. If the appliance will not

operate, follow the instrucons “To Turn O Gas To Appliance” and call your licensed professional or gas supplier. See manual for addional informaon. CLOSEManual Valve OPEN WARNING If you do not follow these instrucons exactly, a re or explosion may result causing property damage, personal injury, or loss of life.KCM Series Manual 53 How to Set the Temperature DANGER Water temperatures over 125° F (52° C) can cause severe burns or scalding resulng in death. Hot water can cause rst degree burns with exposure for as lile as: 3 seconds at 140° F (60° C) 20 seconds at 130° F (54° C) 8 minutes at 120° F (49° C) Children, disabled, or elderly are at highest risk of being scalded. Feel water before bathing or showering. A maintenance display or status monitor is provided in the front panel to indicate operang status and error codes. This water heater requires a minimum ow rate to operate. This rate can be found on the specicaon page in this manual. In some cases when you are not geng hot water or if the water alternates between hot and cold, it is due to the water ow being below or close to the minimum ow rate. Increasing the ow rate should resolve these problems in these cases. If you are experiencing issues with higher temperature sengs, then reduce the temperature seng. Selecng a temperature closer to that which is actually used at the faucet will increase the amount of hot water being delivered to the faucet, due to less cold water mixing at the xture. Before operang, smell all around the appliance area for gas. Be sure to smell next to the oor because some gas is heavier than air and will sele on the oor. Keep the area around the appliance clear and free from combusble materials, gasoline, and other ammable vapors and liquids. Always check the water temperature before entering a shower or bath. Do not use this appliance if any part has been under water. Immediately call a licensed professional to inspect the appliance and to replace any part of the control system and any gas control which has been under water. Should overheang occur or the gas supply fail to shut o, turn o the manual gas control valve to the appliance. Do not adjust the DIP switch unless specically instructed to do so. Do not use an extension cord or an adapter plug with this appliance. Any alteraon to the appliance or its controls can be dangerous and will void the warranty. If you install this water heater in an area that is known to have hard water or that causes scale build-up the water must be treated and/or the heat exchanger ushed regularly. Rinnai provides a “Scale Control System” as an accessory that oers superior lime scale prevenon and corrosion control by feeding a blend of control compounds into the water supply. Damage and repair due to corrosive compounds in the air is not covered by warranty. Keep the air intake locaon free of chemicals, such as chlorine or bleach, that produce fumes. These fumes can damage components and reduce the life of your appliance. Damage and repair due to scale in the heat exchanger is not covered by warranty. WARNING54 KCM Series Manual Check local codes for the maximum water temperature seng allowed when used in nursing homes, schools, day care centers, and all other public applicaons. NOTICE If a newly installed unit with a controller has not been powered for at least 6 hours then the temperature will return to the default seng of 120° F (49° C) if power is interrupted. NOTICE There may be a variaon between the temperature displayed on the temperature controller and the temperature at the tap due to weather condions or the length of pipe to the water heater. NOTICE

1. If the water heater is o, press the

Power buon to turn on.

2. If the Priority light is o, then press

the “Priority buon” on the temperature controller. The orange Priority light will glow indicang that this controller is controlling the temperature and that the water heater is ready to supply hot water. (The priority can only be changed while no hot water is running.)

3. Press the up or down buons to

obtain the desired temperature seng. All hot water sources are able to provide water at this temperature seng unl it is changed again at this or another temperature controller. How to use the Oponal Temperature Controller The units referenced in this manual do not include a temperature controller. The MC-91-2 controller is the standard temperature controller. DO NOT repeatedly operate the water heater and then use a hot water tap while the controller is turned o. Operang the water heater in this way to alternately produce hot water may cause water to condense on the outside of internal parts and accumulate in the water heater cabinet. Dimensions (inches): 3.5 W x 4.75 H x 0.75 D TemperatureDisplayPriorityIndicatorPriorityButtonON/OFFButtonIn UseIndicatorTemperatureSelectionMC-91-2US Temperature Opons Without a Temperature Controller The default temperature seng for this appliance installed without a temperature controller is 120° F (49° C). If desired, the temperature seng can be changed by adjustment of the dip switches: DIPSW1 SW5 SW6

Displayed As 1 2 3 4 Without a controller the status monitor (see page 56) will show the temperature as follows:KCM Series Manual 55 Temperatures Available with a Controller The water heater can deliver water at only one temperature seng at a me. The available temperatures are provided below. A temperature lower than 120° F (49° C) can be obtained at the tap by mixing with cold water. To change the temperature scale from Celsius to Fahrenheit or vice versa, press and hold the “On/O” buon for 5 seconds while the water heater is OFF. Temperature Sengs Available Fahrenheit °F 120 125 130 135 140 Celsius °C 49 52 54 57 60 Seng Controller to Mute On the MC-91-2 to eliminate the beeps when keys are pressed or to turn the beeps back on, press and hold both the up and down buons unl a beep is heard (approximately 5 seconds). Locking the Controller The MC-91-2 controller can be locked by pressing the Priority buon and the up buon together for 5 seconds. A beep will sound conrming that the controller is locked. The display will alternately show “LOC”, the temperature seng, and a diagnosc code if one has been acvated. All of the controllers in the system are also locked. To unlock the controller press the Priority buon and the up buon together for 5 seconds.56 KCM Series Manual To Display Diagnosc Informaon (with controller) To display the most recent diagnosc informaon code press and hold the “On/O” buon for 2 seconds on the MC-91-2 controller. While holding the “On/O” buon press the up buon. The last 9 diagnosc codes will ash one aer the other. To exit this mode press the “On/O” and up buon as before. To enter or exit the maintenance monitor informaon mode, press and hold the down buon for 2 seconds and without releasing it press the ON/OFF buon. To obtain the water ow rate: press the up or down buons unl “01” displays. The water ow rate will then appear. For example “58” means 5.8 gal/min. To obtain the outgoing water temperature press the up or down buons unl “02” displays. The temperature will appear in degrees Fahrenheit. Diagnosc Codes This water heater is designed to display diagnosc codes. If there is a potenal operaon concern refer to the code and remedy on the next page. Data Unit No. Water ow rate 0.1 gal/min 01 Outgoing water temperature Degrees Fahrenheit 02 Diagnosc Informaon (on status monitor) - - Inial (When unit is connected to power). (non-displayed) Standby (power is supplied but there is no demand for hot water). 1,2,3 or 4 Hot water is being supplied without controller. ON Hot water is being supplied with controller FL or FH Stands for Forced Low and Forced High combuson. Only seen during the gas pressure seng procedure which is done when certain components are replaced. Error code ashing The error code will stop ashing aer the problem is corrected and the water heater supplies hot water. Status Monitor Status MonitorKCM Series Manual 57 Diagnosc Codes and Remedies Code Denion Remedy 10 Air Supply or Exhaust Blockage Check that nothing is blocking the ue inlet or exhaust. Check all vent components for proper connecons. licensed professional only Ensure approved venng materials are being used. Ensure vent length is within limits. Verify DIP switches are set properly. Check fan for blockage. 11 No Ignion (heater not turning on) Check that the gas is turned on at the water heater, gas meter, or cylinder. If the system is propane, make sure that gas is in the tank. Ensure appliance is properly grounded. licensed professional only Ensure gas type and pressure is correct. Ensure gas line, meter, and/or regulator is sized properly. Bleed all air from gas lines. Verify DIP switches are set properly. Ensure igniter is operaonal. Check igniter wiring harness for damage. Check gas solenoid valves for open or short circuits. Remove burner cover and ensure all burners are properly seated. Remove burner plate and inspect burner surface for condensaon or debris. Check the ground wire for the PC board. 12 No Flame Check that the gas is turned on at the water heater, gas meter, or cylinder. Check for obstrucons in the ue outlet. If the system is propane, make sure that gas is in the tank. licensed professional only Ensure gas line, meter, and/or regulator is sized properly. Ensure gas type and pressure is correct. Bleed all air from gas lines. Ensure proper venng material was installed. Ensure condensaon collar was installed properly. Ensure vent length is within limits. Verify DIP switches are set properly. Check power supply for loose connecons. Check power supply for proper voltage and voltage drops. Ensure ame rod wire is connected. Check ame rod for carbon build-up. Disconnect and reconnect all wiring harnesses on unit and PC board. Check for DC shorts at components. Check gas solenoid valves for open or short circuits. Remove burner plate and inspect burner surface for condensaon or debris. 14 Thermal Fuse has acvated Check for restricons in air ow around unit and vent terminal. licensed professional only Ensure SW5 in DIPSW 2 is in the o posion. Check gas type of unit and ensure it matches gas type being used. Check for low water ow in a circulang system causing short-cycling. Ensure dip switches are set to the proper posion. Check for foreign materials in combuson chamber and/or exhaust piping. Check heat exchanger for cracks and/or separaons. Check heat exchanger surface for hot spots which indicate blockage due to scale build-up. Refer to instrucons in manual for ushing heat exchanger. Hard water must be treated to prevent scale build up or damage to the heat exchanger. Measure resistance of safety circuit. Ensure high re and low re manifold pressure is correct. Check for improper conversion of product. 16 Over Temperature Warning (safety shutdown because unit is too hot) Check for restricons in air ow around unit and vent terminal. licensed professional only Check for low water ow in a circulang system causing short-cycling. Check for foreign materials in combuson chamber and/or exhaust piping. Check for blockage in the heat exchanger. Some of the checks below should be done by a licensed professional. Consumers should never aempt any acon that they are not qualied to perform. WARNING58 KCM Series Manual Code Denion Remedy 19 Electrical Grounding licensed professional only Check all components for electrical short. 25 Condensate Trap is full Check condensate trap and drain line for blockage. licensed professional only Replace condensate trap.

Outgoing Water Temperature Sensor Check sensor wiring for damage. Measure resistance of sensor. Clean sensor of scale build-up. Replace sensor.

Heat Exchanger Outgoing Temperature Sensor

Outside Temperature Sensor

Modulang Solenoid Valve Signal Check modulang gas solenoid valve wiring harness for loose or damaged terminals. Measure resistance of valve coil.

High Exhaust Gas Temperature Check heat exchanger surface for hot spots which indicate blockage due to scale build-up. Refer to heat exchanger ushing instrucons within this manual. Hard water must be treated to prevent scale build up or damage to the heat exchanger. Contact a licensed professional. 61 Combuson Fan Ensure fan will turn freely. Check wiring harness to motor for damaged and/or loose connecons. Measure resistance of motor winding. 65 Water Flow Control The water ow control valve has failed to close during the bath ll funcon. Immediately turn o the water and disconnue the bath ll funcon. Contact a licensed professional to service the appliance. 70 PC Board Check PC board DIP switches for correct posion. Check the connecon harness at the connecon on the PC board. Replace PC board. 71 Solenoid Valve Circuit Replace the PC Board. 72 Flame Sensing Device Replace the PC Board. LC # (LC0, LC1, LC2,…) Scale Build-up in Heat Exchanger (when checking maintenance code history, “00” is substuted for “LC”) LC (only when a controller is installed , the monitor shows LC0~LC9) indicates that there is scale build up in the heat exchanger and that the heat exchanger needs to be ushed to prevent damage. Refer to the ushing instrucons in the manual. Hard water must be treated to prevent scale build up or damage to the heat exchanger. To operate the water heater temporarily unl the heat exchanger can be ushed, push the On/ O buon (when a controller is installed) on the temperature controller 5 mes. Repeated LC codes will eventually lockout the water heater. Please call Rinnai technical department.

Maintenance has been performed (with controller only) Indicates a licensed professional performed maintenance or corrected an issue.

code Nothing happens when water ow is acvated. Clean inlet water supply lter. On new installaons ensure hot and cold water lines are not reversed. Verify you have at least the minimum ow rate required to re unit. licensed professional only Check for cold to hot cross over. Isolate circulang system if present. Turn o cold water to the unit, open pressure relief valve; if water connues to ow, there is bleed over in your plumbing. Verify turbine spins freely. Measure the resistance of the water ow control sensor. If the display is blank and clicking is coming from the unit, disconnect the water ow servo motor (GY, BR, O, W, P, BL, R). If the display comes on replace the water ow servo motor.KCM Series Manual 59 The appliance must be inspected annually by a licensed professional. Repairs and maintenance shall be performed by a licensed professional. The licensed professional must verify proper operaon aer servicing. Cleaning It is imperave that control compartments, burners, and circulang air passageways of the appliance be kept clean. Clean as follows:

1. Turn o and disconnect electrical power. Allow to

2. Close the water shut o valves. Remove and clean

the water inlet lter.

3. Remove the front panel by removing 4 screws.

4. Use pressurized air to remove dust from the main

burner, heat exchanger, and fan blades. Do not use a wet cloth or spray cleaners on the burner. Do not use volale substances such as benzene and thinners. They may ignite or fade the paint.

5. Use so dry cloth to wipe cabinet.

Vent System The vent system should be inspected at least annually for blockages or damage. If the vent is blocked contact a licensed professional. Motors Motors are permanently lubricated and do not need periodic lubricaon. However you must keep the fan and motor free of dust and dirt by cleaning annually. Temperature Controller Use a so damp cloth to clean the temperature controller. Do not use solvents. Lime / Scale Build-up If you receive diagnosc code “LC#” (LC1, LC2,…), refer to the procedure, Flushing the Heat Exchanger. Refer to the secon on Water Quality to see if your water needs to be treated or condioned. (When checking maintenance code history with temperature controller, “00” is substuted for “LC#”.) The water must be potable, free of corrosive chemicals, sand, dirt, or other contaminates. It is up to the installer to ensure the water does not contain corrosive chemicals, or elements that can aect or damage the heat exchanger. Water that contains chemicals exceeding the levels below aect and damage the heat exchanger. Replacement of the heat exchanger due to water quality damage is not covered by the warranty. Snow Accumulaon Keep the area around ue terminal free of snow and ice. The appliance will not funcon properly if the intake air or exhaust is impeded (blocked or parally blocked) by obstrucons. Coastal Installaons Installaons located in or near coastal areas may require addional maintenance due to corrosive airborne ocean salt. Clean the water lter Clean the inlet water lter by closing the cold and hot water inlet isolaon (shut-o) valves. Put a bucket The following maintenance items are required for the proper operaon of your water heater. Required Maintenance To protect yourself from harm, before performing maintenance: Turn o the electrical power supply by unplugging the power cord or by turning o the electricity at the circuit breaker. (The temperature controller does not control the electrical power.) Turn o the gas at the manual gas valve, usually located immediately below the water heater. Turn o the incoming water supply. This can be done at the isolaon valve immediately below the water heater or by turning o the water supply to the building. WARNING Keep the appliance area clear and free from combusble materials, gasoline, and other ammable vapors and liquids. WARNING The appliance must be inspected annually by a licensed professional. Repairs and maintenance shall be performed by a licensed professional. The licensed professional must verify proper operaon aer servicing.60 KCM Series Manual under the lter at the boom of the water heater to catch any water that is contained inside the unit. Unscrew the water lter. Rinse the lter to remove any debris. Install the lter and open the isolaon valves. Pressure Relief Valve (PRV): Operate the PRV manually once a year. In doing so, it will be necessary to take precauons with regard to the discharge of potenally scalding hot water under pressure. Ensure discharge has a safe place to ow. Contact with your body or other property may cause damage or harm. Visual Inspecon of Flame Verify proper operaon aer servicing. The burner must ame evenly over the enre surface when operang correctly. The ame must burn with a clear, blue, stable ame. See the parts breakdown of the burner for the locaon of the view ports. The ame paern should be as shown in the gures below: Freeze Protecon Make sure in case of freezing weather that the water heater and its water lines are adequately protected to prevent freezing. Damage due to freezing is not covered by the warranty. Refer to the secon on Freeze Protecon. The unit may be drained manually. However, it is highly recommended that: drain down solenoid valves be purchased and installed that will automacally drain the unit if power is lost. These are available in a kit, 104000059. (The condensate trap drain plug and water drain plug are not aected by the auto drain down solenoid valves and will have to be manually opened.) a surge protector with terminals be purchased and installed which allows the solenoid valves to operate if the unit is disabled due to a diagnosc code. This is available as 104000057. Winterizaon These recommendaons are intended to suggest pracces that are eecve for winterizing the water heater. They should be used as a guide only. No liability is assumed for any issues resulng from the use of this informaon. GAS Shut o the gas to the water heater. It is generally preferable to shut o the gas service to the enre locaon if gas is not going to be used. WATER Shut o the cold water supply to the water heater. It is generally preferable to shut o the water to the enre locaon if water is not going to be used. Drain the water heater by opening the drain valves on the cold water line and hot water line. Open several hot water taps and remove the lter assembly at the water inlet in order to allow room for expansion in case there is water in the lines that freeze. ELECTRIC Disconnect the power supply by either unplugging the electrical cord or by turning o the circuit breaker to the water heater to prevent potenal damage from irregular power surges or interrupons. VENT TERMINATION Place a cover over the vent terminaon (intake and exhaust) if it can be safely accessed. The cover should be easy to apply and remove. This will prevent debris, leaves, and small animals from entering the venng and water heater which could cause air ow Tesng the pressure relief valve should only be performed by a licensed professional. Water discharged from the pressure relief valve could cause severe burns instantly or death from scalds. WARNING UNSATISFACTORY FRONT VIEW

YELLOW FLAME FLAME ROD

Rinnai An LC0~LC9 or “00” or 58 diagnosc code indicates the unit is beginning to lime up and must be ushed. Failure to ush the appliance will cause damage to the heat exchanger. Damage caused by lime build-up is not covered by the unit’s warranty. Rinnai strongly recommends installaon of isolaon valves to allow for ushing of the heat exchanger.

1. Disconnect electrical power to the water heater.

2. Close the shuto valves on both the hot water and

cold water lines (V3 and V4).

3. Connect pump outlet hose (H1) to the cold water

line at service valve (V2).

4. Connect drain hose (H3) to service valve (V1).

5. Pour 4 gallons of undiluted virgin, food grade, white

6. Place the drain hose (H3) and the hose (H2) to the

pump inlet into the cleaning soluon.

7. Open both service valves (V1 and V2) on the hot

water and cold water lines.

8. Operate the pump and allow the vinegar to circulate

through the water heater for at least 1 hour at a rate of 4 gallons per minute (15.1 liters per minute).

10. Rinse the vinegar from the water heater as follows:

a. Remove the free end of the drain hose (H3) from the pail. Place in sink or outside to drain. b. Close service valve, (V2), and open shuto valve, (V4). Do not open shuto valve, (V3). c. Allow water to ow through the water heater for 5 minutes. d. Close shuto valve (V4). When unit has nished draining remove the in-line lter at the cold water inlet and clean out any residue. Place lter back into unit and open valve (V4). e. Close service valve, (V1), and open shuto valve, (V3). Flushing the Heat Exchanger

water heater. Following ush procedure call technical assistance (1-800-621- 9419) for PCB reset informaon.62 KCM Series Manual If the water heater is not going to be used during a period of possible freezing weather, it is recommended that the water inside the water heater be drained. Manual Draining of the Water Heater Running a low volume of water through the water heater to prevent freezing If the temperature exceeds the ability of the water heater to freeze protect itself, or if power is lost, the following steps may prevent the water heater and external piping from freezing. (Units connected with EZ Connect (2 unit link) should be drained to prevent freezing if not in use.)

1. Turn the water heater o.

2. Close the gas supply valve.

3. Turn on a hot water tap to ow water about 0.1 gal/min or where the

stream is about 0.2 inches thick. When the water heater or external piping has frozen

1. Do not operate the water heater if it or the external piping is frozen.

2. Close the gas and water valves and turn o the power.

3. Wait unl the water thaws. Check by opening the water supply valve.

4. Check the water heater and the piping for leaks.

about 0.2 inch thick To avoid burns, wait unl the equipment cools down before draining the water. The water in the appliance will remain hot aer it is turned o. WARNING To manually drain the water:

1. Shut o cold water supply and gas supply.

2. Turn o the temperature controller (if it is installed).

3. Disconnect the power to the water heater.

4. Place a container to catch the water. Open hot water tap or

open hot water drain plug at the hot water outlet.

5. Remove water lter to drain the cold water.

6. Unscrew the water drain plug from the condensate drain line

next to the hot water outlet.

7. Remove the condensate trap drain plug and allow to drain.

To resume normal operaon:

1. Conrm that all water drain plugs are removed, that the gas

supply is turned o, and that all taps are closed.

2. Insert the condensate trap drain plug.

3. Screw in the water drain plugs. (Avoid over ghtening)

4. Screw in the water lter in the cold water inlet.

5. Open the cold water supply.

6. Open a tap and conrm that water ows, and then close.

7. Turn on the power.

8. Aer conrming that the temperature controller is o (if it is installed), turn on the gas supply.

9. Turn on the temperature controller (if it is installed), .

Water drain plug Condensate drain line Gas connecon Cold water inlet Hot water outlet Cold water inlet lterKCM Series Manual 63 State Regulaons NOTICE BEFORE INSTALLATION This direct-vent appliance must be installed by a licensed professional. If you are not properly trained, you must not install this unit. IMPORTANT: In the State of Massachuses (248 CMR 4.00 & 5.00) For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residenal purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent terminaon is less than seven (7) feet above nished grade in the area of the venng, including but not limited to decks and porches, the following requirements shall be sased:

1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the me of installaon of the side wall horizontal vented gas

fueled equipment, the installing plumber or gaser shall observe that a hard wired carbon monoxide detector with an alarm and baery back-up is installed on the oor level where the gas equipment is to be installed. In addion, the installing plumber or gaser shall observe that a baery operated or hard wired carbon monoxide detector with an alarm is installed on each addional level of the dwelling, building or structure served by the side wall horizontal vented gas fueled equipment. It shall be the responsibility of the property owner to secure the services of qualied licensed professionals for the installaon of hard wired carbon monoxide detectors a. In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an ac, the hard wired carbon monoxide detector with alarm and baery back-up may be installed on the next adjacent oor level. b. In the event that the requirements of this subdivision can not be met at the me of compleon of installaon, the owner shall have a period of thirty (30) days to comply with the above requirements; provided, however, that during said thirty (30) day period, a baery operated carbon monoxide detector with an alarm shall be installed.

2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in accordance with the above

provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS cered.

3. SIGNAGE. A metal or plasc idencaon plate shall be permanently mounted to the exterior of the building at a

minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heang appliance or equipment. The sign shall read, in print size no less than one-half (1/2) inch in size, "GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS".

4. INSPECTION. The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not

approve the installaon unless, upon inspecon, the inspector observes carbon monoxide detectors and signage installed in accordance with the provisions of 248 CMR 5.08(2)(a)1 through 4.64 KCM Series Manual Replacement Parts Tech Sheet Item No. Gas Control Assembly 100 Electrode / Flame Rod Kit 116, 117 Fan Assembly / Motor 125 Primary Heat Exchanger Assy 143 Secondary Heat Exchanger- Indoor

Secondary Heat Exchanger- Outdoor