DHC Trend - Boiler STIEBEL ELTRON - Free user manual and instructions

USER MANUAL DHC Trend STIEBEL ELTRON

5. Cleaning, care and maintenance _____________________________ 7

7.2 Instructions, standards and regulations _______________________ 8

10.1 Standard wall-mounted installation ____________________________ 9

10.2 Water connections __________________________________________________ 9

10.3 Aerator installation at connected faucet ______________________10

10.4 Electrical connection ______________________________________________10

10.5 Electrical connection with short power cable _______________11

11.4 Operation with preheated water _______________________________13

Before turning on power to the water heater, you MUST flush all air out of the system, then engage the AE3 safety switch. The unit will NOT operate until the AE3 safety switch has been engaged. 1 Mount the unit to the wall (see section 10.1, “Standard wall-mounted installation”, pg. 9). 2 Hook up water connections (see section 10.2, “Water connections”, pg. 9). 3 Hook up electrical connections, but keep circuit breaker off. (See section 10.4, “Electrical connec- tion”, pg. 10) PLQ

D0000053277 4 Open and close all connected draw-off valves at least 5 times, for at least 3 minutes total, until all air has been purged from the pipework and the water heater. 5 Ensure there are no water leaks from any plumbing connections. D0000094561-b 6 Engage the AE3 safety switch by firmly pressing the white reset button until it clicks and fully locks in place (the water heater is delivered with the safety switch disengaged). 7 Turn on power to the water heater at the circuit breaker in the breaker panel.SPECIAL INFORMATION 4 | DHC Trend www.stiebel-eltron-usa.com SPECIAL INFORMATION - Read this entire manual. Failure to follow all the guides, instructions and rules could cause personal injury or property damage. Improper installation, ad- justment, alteration, service and use of this unit can result in serious injury. - This unit must be installed by a licensed electrician and plumber. The installation must comply with all national, state and local plumbing and electric codes. Proper installation is the responsibility of the install- er. Failure to comply with the installation and operat- ing instructions or improper use voids the warranty. - Save these instructions for future reference. The installer should leave these instructions with the consumer. - If you have any questions regarding the installation, use or operation of this water heater, or if you need any additional installation manuals, please call our technical service line at 800.582.8423 (USA and Can- ada only). If you are calling from outside the USA or Canada, please call USA 413.247.3380 and we will refer you to a qualified Stiebel Eltron service repre- sentative in your area. - The water heater is suitable for supplying a shower in many climates (shower operation). If the water heater is also or exclusively used for shower operation, the qualified contractor must adjust the temperature set- ting range to 122 °F (50 °C) or less using the internal anti-scalding protection on the water heater. When using preheated water, it must be ensured that the inlet temperature does not exceed 131 °F (55 °C). - The specified voltage must match the power supply. See the type plate on the right-hand side of the water heater for full information. - Ensure the water heater can be separated from the power supply by a circuit breaker that disconnects all poles with at least 1/8˝ (3 mm) contact separation. - CAUTION: DO NOT INSTALL IN A BATH ENCLOSURE OR SHOWER STALL. DO NOT CONNECT TO A SALT-REGENERATED WATER SOFTENER OR A SALT-WATER WATER SUPPLY. FOR USE ON AN INDIVIDUAL BRANCH CIRCUIT ONLY. CAUTION: CONNECT ONLY TO A CIRCUIT PROTECTED BY A CLASS A GROUND FAULT INTERRUPTER

- The water heater must be properly grounded. See

section 16.2, “Wiring diagrams,” pg. 16.

- The water heater must be permanently connected to fixed wiring. For use on an individual branch circuit only. See section 16.2, “Wiring diagrams,” pg. 16. - Secure the water heater as described in chapter 10, “Installation”, pg. 9. - Observe the minimum permissible water supply pressure of 26.1 psi (1.8 bar). See section 16.6, “Data tables,” pg. 18. - Observe the maximum permissible water supply pressure of 145 psi (10 bar). See section 16.6, “Data tables,” pg. 18. - Drain the water heater as described in section 14.1, “Draining the water heater”, pg. 14.OPERATION General information ENGLISHwww.stiebel-eltron-usa.com DHC Trend | 5 OPERATION

1. General information

The chapters “Special information” and “Operation” are intended for both users and qualified contractors.The chapter “Installation” is intended for qualified contractors. Note Read these instructions carefully before using the water heater and retain them for future reference.Pass on the instructions to a new user if required.1.1 Safety instructions1.1.1 Structure of safety instructions

KEYWORD Type of riskHere, possible consequences are listed that may result from failure to observe the safety instructions.f Steps to prevent the risk are listed.1.1.2 Symbols, type of riskSymbol Type of risk

Burns(burns, scalding) 1.1.3 KeywordsKEYWORD MeaningDANGER Failure to observe this information will result in serious in-jury or death. WARNING Failure to observe this information may result in serious injury or death. CAUTION Failure to observe this information may result in non-serious or minor injury.1.2 Other symbols in this documentation Note General information is identified by the adjacent symbol.f Read these texts carefully.Symbol Meaning

Material losses(water heater damage, material losses, and installation site damage)f This symbol indicates that you have to do something. The ac-tion you need to take is described step by step.1.3 Units of measurement Note All measurements are given in inches (millimeters) unless otherwise stated.

2.1 Intended useThe DHC Trend is suitable for heating domestic hot water or for reheating preheated water. The water heater can supply one or more draw-off points such as hand washing, kitchen, or utility sinks.Examples:- Restroom sinks in commercial/industrial facilities and homes- Kitchen areas in commercial /industrial facilities and homes- Special uses in photo developing shops, laboratories etc.Water will not be reheated if the maximum inlet temperature for reheating is exceeded.The water heater is intended for domestic use. It can be used safely by untrained persons. The water heater can also be used in non-do-mestic environments, e.g. in small businesses, as long as it is used in the same way.Any other use beyond that described shall be deemed inappropriate. Observation of these instructions and of the instructions for any accessories used is also part of the correct use of this water heater.2.2 General safety instructions DANGER: BurnsWater temperatures over 125 °F (52 °C) can cause severe burns instantly or death from scalding. A hot water scald-ing potential exists if the thermostat on the water heater is set too high. Households with small children, disabled or elderly persons may require that the thermostat be set at 110 °F (43 °C) or lower to prevent possible injury from hot water.

!OPERATION Register your product 6 | DHC Trend www.stiebel-eltron-usa.com CAUTION: BurnsIf operating with preheated water, e.g.from a solar ther-mal system, the DHW temperature may vary from the selected set temperature. CAUTION: BurnsDuring operation, the tap can reach temperatures up to149 °F (65 °C).There is a risk of scalding at outlet temperatures in excessof 110 °F (43 °C).

DANGER: InjuryPlease read and follow these instructions. Failure to follow these instructions could result in serious personal injury or death.

CAUTION: DO NOT INSTALL IN A BATH ENCLOSURE OR SHOWER STALL. DO NOT CONNECT TO A SALT-REGENERATED WATER SOFTENER OR A WATER SUPPLY OF SALT WATER. FOR USE ON AN INDIVIDUAL BRANCH CIRCUIT ONLY.CAUTION: CONNECT ONLY TO A CIRCUIT PROTECTED BY A CLASS A GROUND FAULT INTERRUPTERUSE BONDING CONDUCTOR IN ACCORDANCE WITH THE CA-NADIAN ELECTRICAL CODE, PART IDANGER: Electrocution Before proceeding with any installation, adjustment, alteration, or service of this appliance, all circuit break-ers and disconnect switches servicing the appliance must be turned off. Failure to do so could result in seri-ous personal injury or death.DANGER: Electrocution Never remove the water heater‘s cover unless the elec-tricity servicing the water heater is turned off. Failure to do so could result in personal injury or death. WARNING ElectrocutionThe connection to the power supply is only permissible as a permanent connection in conjunction with a ¾˝ Romex clamp. Ensure the water heater can be separated from the power supply by an isolator that disconnects all poles with at least 1/8˝ (3mm) contact separation.

DAMAGE TO THE WATER HEATER AND THE ENVIRON-MENT:The water heater must be installed by a licensed electrician and plumber. The installation must comply with all nation-al, state and local plumbing and electric codes.Service of the water heater must be performed by qualified service technicians.

DAMAGE TO THE WATER HEATER AND THE ENVIRON-MENT:Supply this appliance only from a grounded system. A green terminal (or a wire connector marked “G”, “GR”, “GROUND”, OR “GROUNDING”) is provided for wiring the appliance. To reduce the risk of electric shock, connect this terminal or connector to the grounding terminal of the electric service or supply panel with a continuous copper wire in accordance with the electrical installation code.

WARNING: InjuryWhere children or persons with limited physical, sensory or mental capabilities are to be allowed to control this water heater, ensure that this will only happen under su-pervision or after appropriate instructions by a person re-sponsible for their safety. Children should be supervised to ensure that they never play with the water heater.Where children or persons with limited physical, sensory or mental abilities are allowed to use this water heater, we recommend asking the qualified contractor to set a permanent “Internal anti-scalding protection” temperature limit. See section 11.1, “Temperature set-ting via jumper slot,” pg. 12.

Material lossesThe user should protect the water heater against frost.

See type plate on the water heater.

2.4 Licenses / certificates

- UL (USA) Std. 499 - CSA (Canada) Std. C22.2 No. 64

3. Register your product

You must register this product within 90 days of pur-chase on our web site in order to activate the standard warranty. Go to our web site at www.stiebel-eltron-usa.com and click on “Register Your Product.”Before beginning the registration process, we suggest that you gather the necessary information which will be as follows:Type, Example: DHC 4/6-2 Trend (from the label that is on the unit) Number listed after “No.” Place of Purchase Purchase Date First & Last Name Email address Physical Address Phone NumberOPERATION Water heater description ENGLISH www.stiebel-eltron-usa.com DHC Trend | 7 Installation Date If you have any questions concerning the registration pro- cess or warranty, please contact Stiebel Eltron USA directly at

The water heater switches on automatically as soon as a hot water valve at the tap is opened. When you close the tap, the water heater switches off automatically. From the activation flow rate, the control unit regulates the correct heating output, subject to the temperature selected internally via jumper by a contractor during installation, and the current cold incoming water temperature. If the water heater is operated with preheated water and the inlet temperature exceeds the chosen set temperature, the water is not heated further. Fixed Domestic Hot Water (DHW) temperature The water heater heats water as it flows through the unit. The fixed DHW outlet temperature can be adjusted by a contractor via jumper during installation. The factory default value is 100 °F (38 °C). Other selectable values include: 110 °F (43 °C), 122 °F (50 °C), 140 °F (60 °C). Heating system The Direct Coil

heating system is comprised of a pressure-tested, glass-reinforced polyamide heating chamber with a nichrome wire direct heating coil. It is suitable for hard and soft water areas and is largely insusceptible to scale build-up. The Direct Coil

heating system ensures rapid and efficient DHW production. Note The water heater is equipped with an air detector that largely prevents damage to the heating system. If, during operation, air is drawn into the water heater, the water heater shuts down the heating output for one minute to protect the heating system.

4.1 Recommended settings

The DHC Trend electric tankless water heater offers maximum conve- nience and accuracy when providing DHW. If you do need to operate the water heater with a thermostatic valve, we recommend adjusting the required set temperature on the thermostatic valve.

4.1.1 Following an interruption to the water supply

Material losses To ensure that the direct coil heating system is not damaged following an interruption to the water supply, the water heater must be restarted by taking the following steps. f Disconnect the water heater from the power supply by turning off the connected circuit breaker. f Open and close all connected draw-off valves at least 5 times, for at least 3 minutes total, until all air has been purged from the pipework and the water heater. f Switch the power back at the circuit breaker back ON.

5. Cleaning, care and maintenance

f Never use abrasive or corrosive cleaning agents. A damp cloth is sufficient for cleaning the water heater. f Check the taps regularly. Limescale deposits at the tap outlets can be removed using commercially available descaling agents.

Problem Cause SolutionThe water heater will not start despite the faucet being fully openThere is no power

Check to ensure circuit breaker in breaker panel hasn’t tripped. Reset if necessaryThe white AE3 safety switch has not been engaged during initial startup. Activate if neces-sary (See section 11.3.1, “Initial AE3 safety switch activation,” pg. 13). If the AE3 switch has tripped after initial installation, contact a qualified con-tractor to fix the cause

The aerator in the tap or the shower head is scaled up or dirtyClean and/or descale the aerator or shower head The water supply has been interruptedVent the water heater and the cold water inlet lineWhen hot water is being drawn off, cold water flows for a short period The air detector detects air in the water. It switch-es off the heating output brieflyThe water heater restarts automatically after 1min- ute If you cannot solve the problem, contact your qualified contractor. To facilitate and speed up your inquiry, please provide the serial number from the type plate (000000-0000-000000). For live technical assistance, please contact us at 800.582.8423. Alternatively, you may email us at [e-mail] Nr.: 000000-0000-00000D0000094552-bINSTALLATION Safety 8 | DHC Trend www.stiebel-eltron-usa.com INSTALLATION

Only a qualified contractor should carry out installation, commis-sioning, maintenance and repair of the water heater.

7.1 General safety instructions

We guarantee trouble-free function and operational reliability only if original accessories and spare parts intended for the water heater are used. Material lossesObserve the maximum inlet temperature. Higher tempera-tures may damage the water heater. You can limit the max-imum inlet temperature by installing a central thermostatic valve.WARNING ElectrocutionThis water heater contains capacitors which are discharged when disconnected from the power supply. The capacitor discharge voltage may briefly exceed60VDC.

7.2 Instructions, standards and regulations

Note Observe all applicable national and regional regulations and instructions.- The electrical resistivity of the water must not fall below that stated on the type plate. In a linked water network, factor in the lowest electrical resistivity of the water. Your water supply utility will advise you of the electrical resistivity or conductivity of the water in your area.

8. Water heater description

The following are delivered with the water heater:- Filter screen, factory installed in cold water inlet- Jumper for temperature selection, attached- Jumper for power output switching, attached- Jumper, spare, attached- 2 x mounting screws- 2 x wall anchors- 0.5 gpm (1.9 l/min) flow-reducer/aerator [DHC 3/3.5-1 Trend only]. See section 10.3, “Aerator installation at connected fau-cet,” pg. 10, for more information.- 2 x 0.5 gpm (1.9 l/min) and 1 x 1.0 gpm (3.8 l/min) flow-re-ducer/aerators [DHC 4/6-2 Trend only]. See section 10.3, “Aerator installation at connected faucet,” pg. 10, for more information.

Material lossesInstall the water heater in a room that is free from the risk of frost.f Install DHC Trend in a frost free area. If frost may occur, remove the unit before freezing temperatures set in.f Always install the water heater vertically with plumbing fittings pointing downward. Install the water heater near the draw-off point to minimize pipe runs and thermal losses.f Taps: Do not use open vented or non-pressurized taps.The water heater is suitable for under-sink and over-sink installa-tion.Typical under-sink installationD0000089950-a

1 Electrical junction box2 ½˝ water supply line for faucet installation3 Shut-off valve4 Cold water supply5 Sink6 Cold valve (right)7 Hot valve (left) Note f Install the water heater flush to the wall. The wall must have sufficient load bearing capacity.INSTALLATION Installation ENGLISH www.stiebel-eltron-usa.com DHC Trend | 9

D0000079442 f Maintain the minimum clearances to ensure trouble-free oper- ation of the water heater and facilitate maintenance work.

10.1 Standard wall-mounted installation

10.1.2 Mounting instructions

f Install DHC Trend as close as possible to the hot water draw-off point, for example, directly underneath the sink. f Install DHC Trend in a frost free area. If frost may occur, remove unit before freezing temperatures set in. f Observe minimum clearances on all sides to ensure unob- structed servicing if necessary. f Remove plastic cover by loosening the screw on the bottom. Lift cover off from the bottom. D0000094555-b f Mark the 2drill holes, referencing their position using the water heater rear panel as a guide. f Set water heater rear panel aside and drill the 2 marked holes. f Install wall anchors in the wall, then insert and tighten each mounting screw partially. Screws and plastic wall anchors for mounting on drywall or wood are provided. f Hang the unit on the 2 mounting screws, ensuring the rear of the unit is flush against the wall. f Once the unit is in position, mount the unit securely to the wall by fully tightening the 2 mounting screws. D0000089951-a

10.2 Water connections

Material losses Carry out all water connection and installation work in accordance with regulations.

Material losses Excessive heat from soldering on copper pipes near the DHC may cause damage to the unit or the plastic filter screen located in the cold water inlet.INSTALLATION Installation 10 | DHC Trend www.stiebel-eltron-usa.com NOTICE The cold water connection to the unit MUST be disconnected periodically in order to clean the filter screen. It is required to use water connections that are easily detachable such as braided steel flex connectors. NOTICE Hard water or water with a high mineral count may dam- age the unit. Damage to the unit caused by scale or a high mineral count is not covered under the warranty. NOTICE Tankless water heaters such as the DHC Trend are not re- quired to be equipped with a temperature and pressure relief valve (T&P). If the local inspector will not pass the installation without a T&P, it should be installed on the hot water outlet side of the unit.

10.2.1 Permissible water connection materials

f The DHC’s hot water outlet (left) is designed for connection to copper tubing, PEX tubing or a braided stainless steel hose with a ½˝ NPT female tapered thread. f The plumbing on the cold water inlet side (right) needs to be such that it can easily be removed to allow access to the inlet filter screen. The easiest way to achieve this is to use a braided steel flex connector with a ½˝ female NPT connection.

Material losses If plastic pipework systems are used, take into account the maximum inlet temperature and the maximum permissible pressure.

f Ensure that the minimum activation flow rate for switching on the water heater is met: 0.264 gal (1.0 l/min). f If the required minimum activation flow rate is not met when the draw-off valve is fully opened, increase the water line pres- sure. Minimum supply pressure is 26.1 psi (1.8 bar).

10.2.3 Water connection instructions

Material losses If soldering near the unit is necessary, please direct the flame away from the housing of the unit in order to avoid damage. Note that excessive heat from soldering (not rec- ommended) near the cold water inlet fitting may damage the plastic filter screen located inside it. All plumbing work must comply with national and applicable state and local plumbing codes. Cold water connection (inlet) is on the right side of the unit, hot water connection (outlet) is on the left side of unit. f A pressure reducing valve must be installed if the cold water supply pressure exceeds 150 psi (10 bar). f Make certain that the cold water supply line has been flushed to remove any scale and dirt. f Install shut-off valve in cold water line as shown in the illus- tration on page 8. This allows the unit to be easily isolated for maintenance purposes. D0000094555-b f Connected braided steel flex connectors (recommended for hot outlet, required for cold inlet, not supplied) to the twin ½˝ NPT male connectors. f Open the shut-off valve in the cold water inlet line. When all plumbing work is completed, check for leaks and take corrective action before proceeding.

10.3 Aerator installation at connected faucet

DHC 3/3.5-1 Trend ships with a 0.5 gpm (1.9 l/min) pressure com- pensating flow-reducer/aerator that must be installed on the faucet the water heater is connected to. Failure to install the aerator may result in lower water temperatures than desired. DHC 4/6-2 Trend ships with a 1.0 gpm (3.8 l/min) aerator and 2x 0.5gpm (1.9 l/min) aerators, allowing for maximum installation flexibility. A single 0.5 gpm or 1.0 gpm aerator (depending on re- quired temperature rise) should be installed when the unit is used at the [low] power output setting (jumper position 1). At the [high] power output setting (factory default, jumper position 2), the unit may be plumbed to a single sink using the 1.0 gpm aerator, or to two sinks using the 2 x 0.5 gpm aerators. Failure to install the aerator(s) may result in lower water temperatures than desired.

10.4 Electrical connection

WARNING: Electrocution

Before beginning any work on the electric installation, be sure that main breaker panel switches are “Off” to avoid any danger of electric shock. All mounting and plumbing must be completed before proceeding with electrical hook-up. The unit must be properly grounded in accordance with state and local codes, or in absence of such codes, in accordance with national electric code or the Canadian electric code. Failure to electrically ground the product could result in serious personal injury or death.INSTALLATION Installation ENGLISHwww.stiebel-eltron-usa.com DHC Trend | 11 WARNING ElectrocutionThe connection to the power supply is only permissible as a permanent connection in conjunction with a ¾˝ Romex clamp. Ensure the water heater can be separated from the power supply by an isolator that disconnects all poles with at least 1/8˝ (3mm) contact separation.

CAUTION: DO NOT INSTALL IN A BATH ENCLOSURE OR SHOWER STALL. DO NOT CONNECT TO A SALT-REGENERATED WATER SOFTENER OR A WATER SUPPLY OF SALT WATER. FOR USE ON AN INDIVIDUAL BRANCH CIRCUIT ONLY.CAUTION: CONNECT ONLY TO A CIRCUIT PROTECTED BY A CLASS A GROUND FAULT INTERRUPTERUSE BONDING CONDUCTOR IN ACCORDANCE WITH THE CA-NADIAN ELECTRICAL CODE, PART I Supply this appliance only from a grounded system. A green terminal (or a wire connector marked “G”, “GR”, “GROUND”, OR “GROUNDING”) is provided for wiring the appliance. To reduce the risk of electric shock, connect this terminal or connector to the grounding terminal of the electric service or supply panel with a continuous copper wire in accordance with the electrical installation code.

Material lossesObserve the type plate. The specified rated voltage must match the supply line voltage.

Material lossesThe DHC 3/3.5-1 Trend must only be connected to a 120V electrical supply. Connecting the DHC 3/3.5-1 Trend to a 208–240V electrical supply will permanently damage the unit and void the factory warranty.f All electrical work must comply with national and applicable state and local electrical codes.f The DHC Trend should be connected to a properly grounded dedicated branch circuit of proper voltage rating. In installa-tions with several DHC Trend units, each unit requires an inde-pendent circuit. Please refer to the technical data table for the correct wire and circuit breaker size.f A ¾˝ Romex clamp (required, not supplied) should be installed in the opening located between the hot and cold water con-nections. The wire should be fed through the Romex clamp. The “live” wires must be connected to the slots on the terminal block marked N and L (DHC 3/3.5-1 Trend only) or L and L (all other versions). The ground wire must be connected to the slot marked with the ground symbol. See section 16.2, “Wiring dia-grams,” pg. 16. 4Ǭ–5ǩÝ (125–130 mm) D0000089948-a10.5 Electrical connection with short power cableIf the power cable is not quite long enough, the wiring block can be installed closer to the aperture in the water heater.f Reposition the wiring block from the top to the bottom. To do so, unclip the wiring block by pushing it firmly to the left and pulling it forwards.D0000095302-bf Clip the wiring block in at the bottom by pushing it inwards and to the left until it clicks into place.INSTALLATION Commissioning 12 | DHC Trend www.stiebel-eltron-usa.com

Consult the chart below for the recommended torque amounts on the wiring block screws. Screw Size (mm) Min. Torque (N•cm) Min. Torque (lbf•in)M6 200–250 17.7–22.1 Using the proper torque specifications to secure wire to the wiring block helps to avoid personal loss or property damage.

11.1 Temperature setting via jumper slot

The maximum outlet temperature of each jumper position during normal load operation depends on the operating voltage, flow rate, and incoming water temperature. See tables below for maximum temperature output at 240 V and 208 V nominal operating voltages. 38°C | 100°F 43°C | 109°F 50°C | 122°F 60°C | 140°F D0000094558-bJumper position (240 V) Description 38 °C | 100 °F

240 V Applications where risk of scalding may be a concern 50 °C | 122 °F

208 V Lukewarm water for hand washing (factory default setting) 36 °C | 97°F

208 V Code-compliant hand washing applications 41°C | 106 °F

208 V Warm water for hand washing 49°C | 120°F

208 V DHW for kitchen sink, utility sink, etc. No jumper Limit 32 °C | 90°F *All listed output temperatures assume an incoming water temperature of 15 °C | 59°F f Install the jumper in the required position on the “T max ” pin strip. CAUTION Burns If the water supplied to the appliance is preheated, the internal anti-scalding protection limit may be exceeded. In such cases, limit the temperature with an upstream central thermostatic valve.

11.2 Changing power output via jumper slot

If you select a value other than the factory default setting, you will need to reposition the jumper.

11.3 Initial start-up

Note During initial start-up, you MUST engage the AE3 safety switch by depressing the white reset button before supply- ing power to the water heater. The unit will NOT operate until the safety switch has been engaged. PLQ

D0000053277 f Open and close all connected draw-off valves at least five times total. Let water run for at least three minutes, until all air has been purged from the pipework and the water heater.INSTALLATION Water heater shutdown ENGLISH www.stiebel-eltron-usa.com DHC Trend | 13 f Ensure there are no water leaks from any plumbing connections.

11.3.1 Initial AE3 safety switch activation

D0000094561-b f Engage the AE3 safety switch by firmly pressing the white reset button until it clicks and fully locks in place (the water heater is delivered with the safety switch disengaged). D0000073642 f Hook the water heater cover into the water heater back panel at the top rear. Pivot the cover downwards. Check that the cover is securely seated at both top and bottom. f Secure the cover with the screw. f Remove the protective film from the front panel. D0000053281 f Switch on the power supply.

11.3.2 Water heater handover

f Explain the water heater functions to users, and familiarize them with how it works. f Make the user aware of potential dangers, especially the risk of scalding. f Hand over the instructions.

11.4 Operation with preheated water

The maximum inlet temperature may be limited by installing a central thermostatic valve. Use the thermostatic valve for central premixing, for example when operating a tankless water heater with preheated water.

11.5 Recommissioning

Material losses To ensure that the direct coil heating system is not damaged following an interruption to the water supply, the water heater must be restarted by taking the following steps: f Disconnect the water heater from the power supply by turning the connected circuit breaker. f Open and close all connected draw-off valves at least 5 times, for at least 3 minutes total, until all air has been purged from the pipework and the water heater. f Switch the power back ON.

12. Water heater shutdown

f Shut off power to the unit at the breaker panel by making sure that connected circuit breakers are “OFF” to avoid any danger of electric shock. f Drain the water heater (See section 14.1, “Draining the water heater,” pg. 14").

1Flow sensor 2 High limit safety cut-out, automatic reset, Klixon 3 Pin strips for power output and temperature selection 4 Diagnostic lightsINSTALLATION Maintenance 14 | DHC Trend www.stiebel-eltron-usa.com

WARNING Electrocution Before beginning any work on the water heater, be sure that main breaker panel switches are “Off” to avoid any danger of electric shock.

14.1 Draining the water heater

The water heater can be drained for maintenance work. WARNING Burns Hot water may escape when you drain the water heater. f Close the shut-off valve in the cold water inlet line. f Open all draw-off valves. f Undo the water connections on the water heater. f Store the dismantled water heater free from the risk of frost, as water residues remaining inside the water heater can freeze and cause damage.

14.2 Cleaning the filter screen

WARNING Burns Hot water may escape when you drain the water heater.

Material losses To ensure that the Direct Coil

heating system is not dam- aged following an interruption to the water supply, the water heater must be restarted by taking the following steps. f Shut off power to the unit at the breaker panel by making sure that connected circuit breakers are “OFF” to avoid any danger of electric shock. f Open and close all connected draw-off valves at least 5 times, for at least 3 minutes total, until all air has been purged from the pipework and the water heater. f Switch the power back ON at the breaker panel. The DHC Trend has a built in sediment filter screen that should be cleaned periodically: f Turn off power to the water heater at the circuit breaker. f Turn off the water supply to the water heater at the shut-off valve. f Open a connected hot water tap to relieve built-up pressure (this will minimize leakage when removing the connection from the cold water inlet). f Disconnect the braided steel flex connector from the cold water inlet fitting (right). f To remove the filter screen from the bottom of the cold water inlet, carefully insert a flathead screwdriver just above the plastic lip of the filter screen, and gently pull downward. f Clean the filter screen, re-insert securely into the cold water inlet fitting, and reconnect the braid steel flex connector to the cold water inlet. f Open the cold water supply shut-off valve. f Vent the air from pipes and the water heater by opening and closing all connected draw-off valves at least 5 times, for at least 3 minutes total, until all air has been purged from the pipework and the water heater. f Turn on circuit breaker to bring electrical power to the unit.INSTALLATION Troubleshooting ENGLISH www.stiebel-eltron-usa.com DHC Trend | 15

WARNING Electrocution Never remove or reinstall the water heater’s cover unless the electricity servicing the unit is turned off. Failure to do so could result in personal injury or death. WARNING Electrocution To test the water heater using the internal diagnostic lights, it must be connected to the power supply. When testing with the cover off, never touch any part of the water heater. Doing so could result in serious per- sonal injury or death. Note When testing the water heater using the diagnostic lights, water must be flowing through the unit. Diagnostic lights Red Lights up in the event of a fault Yellow Lights up in heating mode/flashes when output limit reached Green Flashing: Water heater connected to power supply Diagnostic lights Problem Cause Solution No LED is lit The water heater does not heat up There is no power Check to ensure the connected circuit breaker in the main breaker panel hasn’t tripped. Reset if necessary The PCB is faulty Replace the function module Green flashing, yellow off, red off No DHW The shower head/aerator is scaled up Descale or replace the shower head/aerator if necessary The filter screen in the cold water inlet is dirty Clean the filter screen. See section 14.2, “Cleaning the filter screen,” pg. 14 The flow sensor is not plugged in Connect the cable to the PCB The flow sensor is faulty Replace the function module The PCB is faulty Replace the function module Green flashing, yellow on, red off The outlet temperature does not match the set value The device is connected to a power supply <240 V Please observe the information in section 11.1, “Tem- perature setting via jumper slot”, pg. 12 The tap is faulty Replace the tap The heating system is faulty Replace the function module The PCB is faulty Replace the function module Green flashing, yellow off, red on No DHW Air detected Continue draw-off for >1 minute AE3 safety switch not activated during commission- ing Activate AE3 safety switch by pressing the reset button firmly. See section 11.3.1, “Initial AE3 safety switch acti- vation,” pg. 13 AE3 safety switch triggered by self-resetting high limit safety cut-out Check high limit safety cut-out Klixon (plug-in connec- tion, connecting cable); activate AE3 safety switch AE3 safety switch responds again after high limit safety cut-out Klixon has been checked; high limit safety cut-out faulty Replace high limit safety cut-out Klixon activate AE3 safety switch and draw off water at the maximum set value for >1 min Safety switch responds again; PCB faulty Replace the function module PCB faulty (lead break or short circuit in inlet sen- sor) Replace the function moduleINSTALLATION ZĤ¼êÐ|ŒêĒĉ 16 | DHC Trend www.stiebel-eltron-usa.com

Ý (40) Mounting holes, rear cover

1 Power PCB with integral safety switch 2 Direct Coil

heating system 3 Self-resetting high limit safety cut-out, Klixon 4 Wiring block DHC 8/10-2 Trend | DHC 12/15-2 Trend L L 2/GND ~ 208 / 240V L N

1 Power PCB with integral safety switch 2 Direct Coil

heating system 3 Self-resetting high limit safety cut-out, Klixon 4 Wiring blockINSTALLATION ZĤ¼êÐ|ŒêĒĉ ENGLISH www.stiebel-eltron-usa.com DHC Trend | 17

16.3 Hot water output

The domestic hot water (DHW) output is subject to the connected power supply, the water heater's connected load, and the cold water inlet temperature. The rated voltage and rated output can be found on the type plate. Power output in kW 100 °F DHW output in gpm Rated voltage Cold water inlet temperature Model ĜŝƃŨp ŝƃÄŨp ŝÔƃŨp 41 °F 50 °F 59 °F 68 °F DHC 3/3.5-1 Trend

Here, data is shown for electrical resistivity and electrical conduc- tivity. Standard specifica- ŒêĒĉ|ŒĜÑŨ³ ŝƃŨ³ ŝÑŨ³ Min. resistivity

Max. conductivity ı≤ Min. resistivity

Max. conductivity ı≤ Min. resistivity

When calculating the size of the pipework, an water heater pressure drop of 14.5 psi (0.97bar) is recommended.

16.5 Fault conditions

In the event of a fault, temperatures up to 176 °F (80 °C) at a pressure of 145 psi (1.0 MPa) can occur briefly in the installation.INSTALLATION ZĤ¼êÐ|ŒêĒĉ 18 | DHC Trend www.stiebel-eltron-usa.com

, jumper position 1 [low] / 2 [high] 3.0 kW / 3.5 kW 3.8 kW / 6.0 kW 2.9 kW / 4.5 kW Amperage draw, jumper position 1 [low] / 2 [high] 25 A / 29.2 A 15.8 A / 25 A 13.9 A / 21.7 A Min. recommended circuit breaker size

240 V 100/109/122/140 °F (38/43/50/60 °C) Hydraulic data Minimum water flow to activate unit 0.264 gal (1.0 l/min) Nominal water volume 0.07 gal (0.277 l) Other Type of installation Over-sink/under-sink Protection class 1 Insulating block Glass-reinforced polyamide Heating system Direct Coil

Cover and back panel Plastic Color White Dimensions Height 14

˝ (98 mm) Weights Weight 5.5 lbs (2.5 kg) DHC 3/3.5-1 Trend ships with a 0.5 gpm (1.9 l/min) pressure compensating flow-reducer/aerator that must be installed. DHC 4/6-2 Trend ships with 2 x 0.5 gpm (1.9 l/min) and a 1.0 gpm (3.8 l/min) pressure compensating flow-reducer/aerator that must be installed. See section 10.3, “Aerator installation at connected faucet,” pg. 10 for more information.

Factory default setting is jumper position 2 [high]

Overcurrent protection sized at 100% of load. Tankless water heaters are considered a non-continuous load. Use only GFCI Class A circuit breakers.

Copper conductors with a temperature rating of 75 °C or greater must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load. These are our recommendations. Check local codes for compliance if necessary.INSTALLATION ZĤ¼êÐ|ŒêĒĉ ENGLISH www.stiebel-eltron-usa.com DHC Trend | 19 DHC 8/10-2 Trend DHC 12/15-2 Trend Item no. 200063 200064 Electrical data Phase (50/60 Hz) 1/N/GND | 2/GND Rated voltage 240 V 208 V 240 V 208 V Rated output

, jumper position 1 [low] / 2 [high] 7.2 kW / 9.6 kW 5.4 kW / 7.2 kW 12.0 kW / 14.4 kW 9.0 kW / 10.8 kW Amperage draw, jumper position 1 [low] / 2 [high] 30 A / 40 A 26 A / 34.6 A 50 A / 60 A 43.3 A / 52 A Min. recommended circuit breaker size

240 V 100/109/122/140 °F (38/43/50/60 °C) Hydraulic data Minimum water flow to activate unit 0.264 gal (1.0 l/min) Nominal water volume 0.07 gal (0.277 l) Other Type of installation Over-sink/under-sink Protection class 1 Insulating block Glass-reinforced polyamide Heating system Direct Coil Cover and back panel Plastic Color White Dimensions Height 14

˝ (98 mm) Weights Weight 5.5 lbs (2.5 kg)

Factory default setting is jumper position 2 [high]

Overcurrent protection sized at 100% of load. Tankless water heaters are considered a non-continuous load. Use only GFCI Class A circuit breakers.

Copper conductors with a temperature rating of 75 °C or greater must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load. These are our recommendations. Check local codes for compliance if necessary.INSTALLATION Spare parts 20 | DHC Trend www.stiebel-eltron-usa.com

14 Pipe elbow set 340542 340542 340542 340542 15 Pipe elbow connection set (includes clips and gaskets)

This Warranty is valid for U.S.A. & Canada only. Warranties may vary by country. Please consult your local Stiebel Eltron Repre-sentative for the Warranty for your country.

The installation, electrical connection and first operati-on of this appliance should be carried out by a qualified installer.

The company does not accept liability for failure of any goods supplied which have not been installed and ope-rated in accordance with the manufacturer‘s instructions. Environment and recycling Please help us to protect the environment by disposing of the packaging in accordance with the national regulations for waste processing.Subject to the terms and conditions set forth in this limited warranty, Stiebel Eltron, Inc. (the “Manufacturer”) hereby warrants to the original purchaser (the “Owner”) that each Tankless Electric Domestic Hot Water Heater (the “Heater”) shall not (i) leak due to defects in the Manufacturer’s materials or workmanship for a period of ten (10) years from the date of purchase or (ii) fail due to defects in the Manufacturer’s materials or workmanship for a period of three (3) years from the date of purchase. As Owner’s sole and exclusive remedy for breach of the above warranty, Manufacturer shall, at the Manufacturer’s discretion, send replacement parts for local repair; retrieve the unit for factory repair, or replace the defective Heater with a replacement unit with comparable operating features. Manufacturer’s maximum liability under all circumstances shall be limited to the Owner’s purchase price for the Heater.This limited warranty shall be the exclusive warranty made by the Manufacturer and is made in lieu of all other warranties, express or implied, whether written or oral, including, but not limited to warranties of merchantability and fi tness for a particular purpose. Manufacturer shall not be liable for incidental, consequential or contingent damages or expenses arising directly or indirectly from any defect in the Heater or the use of the Heater. Manufacturer shall not be liable for any water damage or other damage to property of Owner arising, directly or indirectly, from any defect in the Heater or the use of the Heater. Manufacturer alone is authorized to make all warranties on Manufacturer’s behalf and no statement, warranty or guarantee made by any other party shall be binding on Manufacturer.Manufacturer shall not be liable for any damage whatsoever relating to or caused by:1. any misuse or neglect of the Heater, any accident to the Heater, any alteration of the Heater, or any other unintended use;2. acts of God and circumstances over which Manufacturer has no control; 3. installation of the Heater other than as directed by Manufacturer and other than in accordance with applicable building codes;4. failure to maintain the Heater or to operate the Heater in accordance with the Manufacturer’s specifi cations;5. operation of the Heater under fl uctuating water pressure or in the event the Heater is supplied with non-potable water, for any duration;6. improper installation and/or improper materials used by any installer and not relating to defects in parts or workmanship of Manufacturer;7. moving the Heater from its original place of installation;8. exposure to freezing conditions;9. water quality issues such as corrosive water, hard water, and water contaminated with pollutants or additives;Should owner wish to return the Heater to manufacturer for repair or replacement under this warranty, Owner must fi rst secure written authorization from Manufacturer. Owner shall demonstrate proof of purchase, including a purchase date, and shall be responsible for all removal and transportation costs. If Owner cannot demonstrate a purchase date this warranty shall be limited to the period beginning from the date of manufacture stamped on the Heater. Manufacturer reserves the right to deny warranty coverage upon Manufacturer’s examination of Heater. This warranty is restricted to the Owner and cannot be assigned.Some States and Provinces do not allow the exclusion or limitation of certain warranties. In such cases, the limitations set forth herein may not apply to the Owner. In such cases this warranty shall be limited to the shortest period and lowest damage amounts allowed by law. This warranty gives you specifi c legal rights and you may also have other rights which vary from State to State or Province to Province.Owner shall be responsible for all labor and other charges incurred in the removal or repair of the Heater in the fi eld. Please also note that the Heater must be installed in such a manner that if any leak does occur, the fl ow of water from any leak will not damage the area in which it is installed.