ARNU21GL6G4 - Air Conditioning LG - Free user manual and instructions

USER MANUAL ARNU21GL6G4 LG

Rev.03_032625 2019-20252 Indoor Unit Ceiling Concealed Duct - Low Static Type Indoor Unit Installation Manual

• Four type "A" screws Connecting cable Pipes: Gas side Liquid side (Refer to Product Data) Insulation materials Additional drain pipe Level gauge Screw driver Electric drill Hole core drill Flaring tool set Specified torque wrenches (different depending on model No.) Spanner
• Half union A glass of water Screw driver Hexagonal wrench Gas-leak detector Vacuum pump Gauge manifold Owner's manual Thermometer Features p. 3
• Safety Precautions p. 4
• Installation p. 9
• Selection the best location p. 9
• Ceiling opening dimension and hanging bolt location p. 10
• Indoor Unit Installation p. 11
• Wiring Connection p. 11
• Checking the Drainage p. 12
• Indoor Unit Drain Piping p. 13
• Dip Switch Setting p. 15
• Group Control Setting p. 16
• Model Designation p. 21
• Airborne Noise Emission p. 21
• Limiting concentration p. 21
• How to Set E.S.P? Installation Requirements Required Parts Required T oolsFeature ENGLISH Features p. 22

asher for hanging bracket

nsulation for fitting

Installation manual for gas pipe for liquid pipe Installation T ool Air Outlet VentsAir FilterControl BoxAir Intake VentsWired Remote Controller Installation Manual 3Safety Precautions Safety Precautions To prevent injury to the user or other people and property damage, the following instructions must befollowed.Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications. WARNING CAUTION This symbol indicates the possibility of death or serious injury.This symbol indicates the possibility of injury or damage to properties only.Meanings of symbols used in this manual are as shown below. Be sure not to do. Be sure to follow the instruction. WARNING Installation

• Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated circuit. - There is risk of fire or electric shock.

• For electrical work, contact the dealer , seller, a qualified electrician, or an Authorized Service Center. - Do not disassemble or repair the product. There is risk of fire or electric shock.

• Always ground the product. - There is risk of fire or electric shock.

• Install the panel and the cover of control box securely. - There is risk of fire or electric shock.

• Always install a dedicated circuit and breaker. - Improper wiring or installation may cause fire or electric shock

• Use the correctly rated breaker or fuse. - There is risk of fire or electric shock.

• Do not modify or extend the power cable. - There is risk of fire or electric shock.

• Do not install, remove, or re-install the unit by yourself (customer). - There is risk of fire, electric shock, explosion, or injury.

• Be cautious when unpacking and installing the product. The following symbols are displayed on indoor and outdoor units.Read the precautions in this manualcarefully before operating the unit.This appliance is filled with flammablerefrigerant (R32)This symbol indicates that the OperationManual should be read carefully.This symbol indicates that a servicepersonnel should be handling thisequipment with reference to theInstallation Manual. 4 Indoor UnitSafety Precautions ENGLISH - Sharp edges could cause injury . Be especially careful of the case edges and the fins on the condenser and evaporator.

• For installation, always contact the dealer or an Authorized Service Center. - There is risk of fire, electric shock, explosion, or injury.

• Do not install the product on a defective installation stand. - It may cause injury, accident, or damage to the product.

• Be sure the installation area does not deteriorate with age. - If the base collapses, the air conditioner could fall with it, causing property damage, product failure, and personal injury.

• Do not turn on the breaker or power under condition that front panel, cabinet, top cover, control box cover are removed or opened. - Otherwise, it may cause fire, electric shock, explosion or death.

• Use a vacuum pump or Inert (nitrogen) gas when doing leakage test or air purge. Do not compress air or Oxygen and Do not use Flammable gases. Otherwise, it may cause fire or explosion. - There is the risk of death, injury, fire or explosion. Operation

• Do not let the air conditioner run for a long time when the humidity is very high and a door or a window is left open. - Moisture may condense and wet or damage furniture.

• Take care to ensure that power cable could not be pulled out or damaged during operation. - There is risk of fire or electric shock.

• Do not place anything on the power cable. - There is risk of fire or electric shock.

• Do not plug or unplug the power supply plug during operation. - There is risk of fire or electric shock.

• Do not touch(operate) the product with wet hands. - There is risk of fire or electrical shock.

• Do not place a heater or other appliances near the power cable. - There is risk of fire and electric shock.

• Do not allow water to run into electric parts. - It may cause There is risk of fire, failure of the product, or electric shock.

• The appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as specified for operation.(for R32) Installation Manual 5Safety Precautions

• Do not store or use flammable gas or combustibles near the product. - There is risk of fire or failure of product.

• Do not use the product in a tightly closed space for a long time. - Oxygen deficiency could occur.

• When flammable gas leaks, turn off the gas and open a window for ventilation before turn the product on. - Do not use the telephone or turn switches on or off. There is risk of explosion or fire.

• If strange sounds, or small or smoke comes from product. Turn the breaker off or disconnect the power supply cable. - There is risk of electric shock or fire.

• Stop operation and close the window in storm or hurricane. If possible, remove the product from the window before the hurricane arrives. - There is risk of property damage, failure of product, or electric shock.

• Do not open the inlet grill of the product during operation. (Do not touch the electrostatic filter, if the unit is so equipped.) - There is risk of physical injury, electric shock, or product failure.

• When the product is soaked (flooded or submerged), contact an Authorized Service Center. - There is risk of fire or electric shock.

• Be cautious that water could not enter the product. - There is risk of fire, electric shock, or product damage.

• Ventilate the product from time to time when operating it together with a stove, etc. - There is risk of fire or electric shock.

• Turn the main power off when cleaning or maintaining the product. - There is risk of electric shock.

• When the product is not be used for a long time, disconnect the power supply plug or turn off the breaker. - There is risk of product damage or failure, or unintended operation.

• T ake care to ensure that nobody could step on or fall onto the outdoor unit. - This could result in personal injury and product damage.

• When mechanical connectors are reused indoors, sealing parts shall be renewed.(for R32)

• When flared joints are reused indoors, the flare part shall be refabricated. (for R32) 6 Indoor UnitSafety Precautions ENGLISH CAUTION Installation

• Always check for gas (refrigerant) leakage after installation or repair of product. - Low refrigerant levels may cause failure of product.

• Install the drain hose to ensure that water is drained away properly

- A bad connection may cause water leakage.

• Keep level even when installing the product. - To avoid vibration or water leakage.

• Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods. - It may cause a problem for your neighbors.

• Use two or more people to lift and transport the product. - Avoid personal injury.

• Do not install the product where it will be exposed to sea wind (salt spray) directly. - It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins, could cause product malfunction or inefficient operation. Operation

• Do not expose the skin directly to cool air for long periods of time. (Don't sit in the draft.) - This could harm to your health.

• Do not use the product for special purposes, such as preserving foods, works of art, etc. It is a consumer air conditioner , not a precision refrigeration system. - There is risk of damage or loss of property.

• Do not block the inlet or outlet of air flow. - It may cause product failure.

• Use a soft cloth to clean. Do not use harsh detergents, solvents, etc. - There is risk of fire, electric shock, or damage to the plastic parts of the product.

• Any person who is involved with working on or breaking into a refrigerant circuit should hold a current valid certificate from an industry-accredited assessment authority, which authorises their competence to handle refr- igerants safely in accordance with anindustry recognised assessment specification.(for R32) Installation Manual 7Safety Precautions

• Do not touch the metal parts of the product when removing the air filter. They are very sharp! - There is risk of personal injury.

• Do not step on or put anyting on the product. (outdoor units) - There is risk of personal injury and failure of product.

• Always insert the filter securely. Clean the filter every two weeks or more often if necessary. - A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage.

• Do not insert hands or other objects through the air inlet or outlet while the product is operated. - There are sharp and moving parts that could cause personal injury.

• Do not drink the water drained from the product. - It is not sanitary and could cause serious health issues.

• Use a firm stool or ladder when cleaning or maintaining the product. - Be careful and avoid personal injury.

• Replace the all batteries in the remote control with new ones of the same type. Do not mix old and new batteries or different types of batteries. - There is risk of fire or explosion.

• Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire. - They may burn or explode.

• If the liquid from the batteries gets onto your skin or clothes, wash it well with clean water. Do not use the remote if the batteries have leaked. - The chemicals in batteries could cause burns or other health hazards.

• If you eat the liquid from the batteries, brush your teeth and see doctor. Do not use the remote if the batteries have leaked. - The chemicals in batteries could cause burns or other health hazards.

• Servicing shall only be performed as recommended by the equipment manufacturer. Maintenance and repair requiring the assistance of other skilled personnel shall be carried out under the supervision of the person competent in the use of flammable refrigerants. (for R32) 8 Indoor UnitInstallation ENGLISH Installation Indoor unit Install the air conditioner in the location that satisfies the fol-lowing conditions.• The place shall easily bear a load exceeding four times theindoor unit’s weight.• The place shall be able to inspect the unit as the figure.• The place where the unit shall be leveled.• The place shall easily connect with the outdoor unit.• The place where the unit is not affected by an electricalnoise.• The place where air circulation in the room will be good.• There should not be any heat source or steam near the unit Confirm the positional relationship between the unit andsuspension bolts.• Installation the ceiling opening to clean the filter or serviceunder the product. Selection of the best location A(Min)Inspection hole(600 x 600)Control boxH=20 or more• Suitable dimension "H" is necessary to get a slope to drain as shown in the figureSide view (unit: mm)

Installation Manual 9Installation Flexible installation Case 1：Air inlet from rear (Factory mode) Case 2：Air inlet from bottom. *Panel 1 is bend 90° inward and then fix screw to the case. Air inlet Air inlet Panel 1 Panel 1 Bend line(90°) Panel 2 Panel 2 screw(6EA) 10 Indoor UnitInstallation ENGLISH - The appliance shall be installed, operated and stored in a room with a floor area larger than the minimum area. - Use the graph of table to determine the minimum area. Minimum floor area

(for R32) - m : Total refrigerant amount in the system - Total refrigerant amount : factory refrigerant charge + additional refrigerant amount - Amin : minimum area for installation Floor location m (kg) Amin (m

Floor location m (kg) Amin (m

Wall mounted m (kg) Amin (m

Wall mounted m (kg) Amin (m

Ceiling Mounted m (kg) Amin (m

Ceiling Mounted m (kg) Amin (m

Installation Manual 11Installation Ceiling dimension and hanging bolt location Installation of Unit Install the unit above the ceiling correctly.

• Apply a joint-canvas between the unit and duct to absorb unnecessary vibration.

• Apply a filter Accessory at air return hole. ※ Install the unit leaning to a drainage hole side as a figure for easy water drainage.

• A place where the unit will be leveled and that can support the weight of the unit.

• A place where the unit can withstand its vibration.

• A place where service can be easily performed.

M10 Nut M10 washer X 4 X 4 M10 Nut M10 washer X 4 X 8

• Select and mark the position for fixing bolts.

Drill the hole for set anchor on the face of ceil- ing.

• Insert the set anchor and washer onto the sus- pension bolts for locking the suspension bolts on the ceiling.

nt the suspension bolts to the set anchor firmly.

• Secure the installation plates onto the suspen- sion bolts (adjust level roughly) using nuts, washers and spring washers. 1 Set anchor Old building New building 2 Plate washer3 Spring washer4 Nut5 Suspension bolts Connect the wires to the terminals on the control board individually according to the outdoor unit connec- tion.

• Ensure that the color of the wires of outdoor unit and the terminal No. are the same as those of indoor unit respectively. Clamping of cables

1) Arrange 2 power cables on the control panel.

2) First, fasten the steel clamp with a screw to the inner boss of control panel.

3) For the cooling model, fix the other side of the clamp with a screw strongly. For the heat pump

model, put the 0.75mm

cable(thinner cable) on the clamp and tighten it with a plastic clamp to the other boss of the control panel. Wiring Connection Indoor Unit Installation CAUTION : Tighten the nut and bolt to prevent unit falling.

WARNING : Make sure that the screws of the terminal are free from looseness.

CAUTION : The Power cord connected to the unit should be selected according to the following specifications. Terminal Block IndoorTerminal Block IndoorINDOOR POWER INPUTOutdoor unitIndoor unitCentral controllerOutdoor unitIndoor unit 12V Installation Manual 13 ENGLISHInstallation

1. Remove the Air Filter.2. Check the drainage.• Spray one or two glasses of water upon theevaporator.• Ens

ure that water flows drain hose of indoor unit without any leakage. Checking the Drainage

• When mechanical connectors are reused indoors, sealing parts shall be renewed.• When flared joints are reused indoors, the flare part shall be re-fabricated. 14 Indoor UnitInstallation CAUTION Ceiling Drain Pump useDrainage hole Front of view 1. Install declination of the indoor unit is very important for the drainof the duct type air conditioner.2. Minimum thickness of the insulation for the connecting pipe shall be 19mm.• The unit must be horizontal or declined to the drain hose connected when finishedinstallation.• Drain piping must have down-slope (1/50 to 1/100): be surenot to provide up-and-down slope to prevent reversal flow.
• During drain piping connection, be careful not to exert extra force on the drain port on the indoor unit.
• The outside diameter of the drain connection on the indoor unit is 32mm.• Be sure to install heat insulation on the drain piping.Piping material: Polyvinyl chloride pipe VP-25 and pipe fittingsThe air conditioner uses a drain pump to drain water.Use the following procedure to test the drain pump operat ion:

• Connect the main drain pipe to the exterior and leave it provisionally until the test comes to an end.
• Feed water to the flexible drain hose and check the piping for leakage.
• Be sure to check the drain pump for normal operating and noise when electrical wiringis complete.
• When the test is complete, connect the flexible drain hose to the drain port on theindoor unit.Heat insulation material: Polyethylene foam with thick-ness more than 8 mm.Upwardroutingnot allowedPipe clampMaintenance drain portIndoor unit Drain Piping Feed water Drain PumpDrain panFlexible drain hoseMain drain pipeGlue the jointDrain port Drain hose connectionUse the clip Drain test Installation Manual 15 ENGLISHInstallation 16 Indoor Unit CAUTION: After the confirmation of the above conditions, prepare the wiring as follows:

1) Never fail to have an individual power specialized for the air conditioner.

for the method of wiring, be guided by the circuit diagram posted on the inside of control box cover.

2) Provide a circuit breaker switch between power source and the unit.

3) The screws which fasten the wiring in the casing of electrical fittings are liable

to come loose from vibrations to which the unit is subjected during the course of transportation. Check them and make sure that they are all tightly fastened. (If they are loose, it could give rise to burn-out of the wires.)

4) Specification of power source

5) Confirm that electrical capacity is sufficient.

6) Be sure that the starting voltage is maintained at more than 90 percent of the

rated voltage marked on the name plate.

7) Confirm that the cable thickness is as specified in the power sources specifi-

cation. (Particularly note the relation between cable length and thickness.)

8) Never fail to equip a leakage breaker where it is wet or moist.

9) The following troubles would be caused by voltage drop-down.

• Vibration of a magnetic switch, damage on the contact point, fuse breaking, distur- bance by the normal function of an overload protection device.

• Proper starting power is not given to the compressor. HAND OVER

each the customer the operation and maintenance procedures, using the operation manual. (air filter cleaning, temperature control, etc.)Installation Manual 17 Installation Dip Switch Setting For Multi V Models, DIP switch 1, 2, 6, 8 must be set OFF

SW3 Group Control Selection of Master or Slave Master Slave Of

SW4 Dry Contact Mode Selection of Dry Contact Mode Wired/Wireless remote controller selection of Manual or Auto operation Mode Auto Off SW5 Installation Fan continuous operation Continuous operation Re- moval - Off SW6 Heater linkage N/A - - Off SW7 Ventilator link- age Selection of Ventilator linkage Linkage Removal Working Off Vane selection (Console) Selection of up/down side Vane Up side + Down side Vane Up side Vane Only Region selec- tion Selection tropical re- gion General model

In case that the products meet specific conditions, “Auto addressing” function can start automatically with the improved speed by turning the DIP switch #3 of the outdoor unit and resetting the power

※ Specific conditions: - All names of the indoor units are ARNU****4. - The serial number of Multi V super IV (outdoor units) is after October 2013. DIP switch 7 segment Outdoor Unit PCB Outdoor Unit DIP Switch ENGLISHInstallation 18 Indoor Unit Group Control Setting Master GND Signal 12 V LGAP Network System Master Slave Slave Slave Display Error Message Only connect serial signal and GND lines between indoor units.

Wired remote controller 1 + Standard Indoor Units Some products have no DIP switch on PCB. It is possible to set indoor units to Master or Slave by using the wireless remote controller instead of DIP switch. For the details of the setting, please refer to the manual of the wireless remote controller.

1. It is possible to 16 indoor units(Max.) by one wired remote controller.

Set only one indoor unit to Master, set the others to Slave.

2. It is possible to connect with every type of indoor units.

3. It is possible to use wireless remote controller at the same time.

4. It is possible to connect with Dry Contact and Central controller at the same time.

- The Master indoor unit is possible to recognize Dry Contact and Central Controller only.

5. In case that any error occurs at indoor unit, the error code is displayed on the wired remote

controller. It is possible to control the other indoor units except the error units. DIP Switch in PCB Master Setting - No. 3 Off Slave Setting - No. 3 On Indoor Unit DIP SwitchInstallation Manual 19 Installation GND Signal 12 V LGAP Network System Master Master Slave Slave Donʼt connect serial 12V line

Display Error Message Master Master It is possible to connect indoor units since Feb. 2009. It can be the cause of malfuctions when there is no setting of master and slave. In case of Group Control, it is possible to use following functions. - Selection of operation, stop or mode - Temperature setting and room temperature check - Current time change - Control of flow rate (High/Middle/Low) - Reservation settings It is not possible to use some functions. It is possible to control 16 indoor units(Max.) with the master wired remote control. Other than those, it is same with the Group Control 1.

• FAU : Fresh Air Intake Unit Standard: Standard Indoor Unit In case of connecting with standard indoor unit and Fresh Air Intake Unit, separate Fresh Air Intake Unit with standard units. (N, M ≤ 16) (Because setting temperature are different.) Other than those, it is same with Group Control 1.

Mixture connection with indoor units and Fresh Air Intake UnitInstallation Manual 21 Installation LGAP Network System Master Slave GND Signal 12 V

Wired remote controller 2 + Indoor unit 1

1. It is possible to connect two wired remote controllers (Max.) with one indoor unit.

Set only one indoor unit to Master, set the others to Slave. Set only one wired remote controller to Master , set the others to Slave.

2. Every types of indoor unit is possible to connect two remote controller.

3. It is possible to use wireless remote controller at the same time.

4. It is possible to connect with Dry Contact and Central controller at the same time.

5. In case that any error occurs at indoor unit, the error code is displayed on the wired

6. There isnʼt limits of indoor unit function.

ENGLISHInstallation 22 Indoor Unit

Accessories for group control setting It is possible to set group control by using below accessories. Indoor unit 2 EA +W ired remote controller Indoor unit 1 EA +W ired remote controller 2EA

PZCWRCG3 cable used for connection

1. The above table shows the correlation between the air rates and E.S.P

2. Please refer wired remote controller manual for E.S.P setting procedure.2019-20252 Unità interna

1. The above table shows the correlation between the air rates and E.S.P.

1. The above table shows the correlation between the air rates and E.S.P.

1. The above table shows the correlation between the air rates and E.S.P.

1. The above table shows the correlation between the air rates and E.S.P.

1. Install declination of the indoor unit is very important for the drain of the duct type air conditioner.

• The information for Eco design is available on the following free access website. https://www.lg.com/global/support/cedoc/cedoc LG Electronics Tianjin Appliances Co.,Ltd. No.09, JinWei Road, Beichen District,Tianjin, 300402.P.R.China