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• 

Take into account strong winds, typhoons, or earthquakes 

when installing. Improper installation may result in the unit 

falling and causing accidents.

• 

Make sure that a separate power supply circuit is provided 

for this unit and that all electrical work is carried out by 

qualified personnel according to local, state, and national 

regulations. An insufficient power supply capacity or 

improper electrical construction may lead to electric shock 

or fire.

•  Make sure that all wiring is secured, that specified wires 

are used, and that no external forces act on the terminal 

connections or wires. Improper connections or installation 

may result in fire.

• 

When wiring, position the wires so that the electrical 

wiring box cover can be securely fastened. Improper 

positioning of the electrical wiring box cover may result in 

electric shock, fire, or the terminals overheating.

• 

Before touching electrical parts, turn off the unit.

• 

It is recommended to install a ground fault circuit 

interrupter if one is not already available. This helps 

prevent electric shock or fire.

• 

Securely fasten the outdoor unit terminal cover (panel). If the 

terminal cover/panel is not installed properly, dust or water 

may enter the outdoor unit causing fire or electric shock.

• 

When installing or relocating the system, keep the refrigerant 

circuit free from substances other than the specified 

refrigerant (R410A) such as air. Any presence of air or other 

foreign substance in the refrigerant circuit can cause an 

abnormal pressure rise or rupture, resulting in injury.

• 

Do not change the setting of the protection devices. If the 

pressure switch, thermal switch, or other protection device 

is shorted and operated forcibly, or parts other than those 

specified by Daikin are used, fire or explosion may occur.

CAUTION 

•  Do not touch the switch with wet fingers. Touching a switch 

with wet fingers can cause electric shock.

• 

Do not allow children to play on or around the unit to 

prevent injury.

•  The heat exchanger fins are sharp enough to cut. To avoid 

injury wear gloves or cover the fins while working around 

them.

• 

Do not touch the refrigerant pipes during and immediately 

after operation as the refrigerant pipes may be hot or 

cold, depending on the condition of the refrigerant flowing 

through the refrigerant piping, compressor, and other 

refrigerant cycle parts. Your hands may suffer burns or 

frostbite if you touch the refrigerant pipes. To avoid injury, 

give the pipes time to return to normal temperature or, if 

you must touch them, be sure to wear proper gloves.

• 

Install drain piping to proper drainage. Improper drain 

piping may result in water leakage and property damage.

• 

Insulate piping to prevent condensation.

• 

Be careful when transporting the product.

• 

Do not turn off the power immediately after stopping 

operation. Always wait for at least 5 minutes before turning 

off the power. Otherwise, water leakage may occur.

• 

Do not use a charging cylinder. Using a charging cylinder 

may cause the refrigerant to deteriorate.

• 

Refrigerant R410A in the system must be kept clean, dry, 

and tight. 

(a)  Clean and Dry -- Foreign materials (including mineral 

oils such as SUNISO oil or moisture) should be 

prevented from getting into the system.

(b)  Tight -- R410A does not contain any chlorine, does not 

destroy the ozone layer, and does not reduce the earth’s 

protection again harmful ultraviolet radiation. R410A 

can contribute to the greenhouse effect if it is released. 

Therefore take proper measures to check for the tightness 

of the refrigerant piping installation. Read the chapter 

Refrigerant Piping Work

 and follow the procedures.

• 

Since R410A is a blend, the required additional refrigerant 

must be charged in its liquid state. If the refrigerant is 

charged in a state of gas, its composition can change and 

the system will not work properly.

• 

The indoor unit is for R410A. See the catalog for indoor 

models that can be connected. Normal operation is not 

possible when connected to other units.

• 

Remote controller (wireless kit) transmitting distance can be 

shorter than expected in rooms with electronic fluorescent 

lamps (inverter or rapid start types). Install the indoor unit 

far away from fluorescent lamps as much as possible.

• 

Indoor units are for indoor installation only. Outdoor units can be 

installed either outdoors or indoors. This unit is for indoor use.

• 

Do not install the air conditioner or heat pump in the 

following locations:

(a)  Where a mineral oil mist or oil spray or vapor is 

produced, for example, in a kitchen. 

 

Plastic parts may deteriorate and fall off or result in 

water leakage.

(b)  Where corrosive gas, such as sulfurous acid gas, is 

produced.  

Corroding copper pipes or soldered parts may result in 

refrigerant leakage.

(c)  Near machinery emitting electromagnetic waves. 

Electromagnetic waves may disturb the operation of 

the control system and cause the unit to malfunction.

(d)  Where flammable gas may leak, where there is carbon 

fiber, or ignitable dust suspension in the air, or where 

volatile flammables such as thinner or gasoline are 

handled. Operating the unit in such conditions can 

cause a fire.

• 

Take adequate measures to prevent the outdoor unit 

from being used as a shelter by small animals. Small 

animals making contact with electrical parts can cause 

malfunctions, smoke, or fire. Instruct the user to keep the 

area around the unit clean.

NOTE 

• 

Install the power supply and inter-unit wires for the indoor 

and outdoor units at least 3.5ft away from televisions or 

radios to prevent image interference or noise. Depending 

on the radio waves, a distance of 3.5ft may not be 

sufficient to eliminate the noise.

• 

Dismantling the unit, treatment of the refrigerant, oil and 

additional parts must be done in accordance with the 

relevant local, state, and national regulations.

• 

Do not use the following tools that are used with 

conventional refrigerants: gauge manifold, charge hose, gas 

leak detector, reverse flow check valve, refrigerant charge 

base, vacuum gauge, or refrigerant recovery equipment.

• 

If the conventional refrigerant and refrigerator oil are 

mixed in R410A, the refrigerant may deteriorate.

• 

This air conditioner or heat pump is an appliance that 

should not be accessible to the general public.

•  As design pressure is 478 psi, the wall thickness of field-

installed pipes should be selected in accordance with the 

relevant local, state, and national regulations.

English

01_EN_3P379970-8B.indd   2

11/17/2015   9:11:12

Summary of Contents for 2MXL18QMVJU

Page 1: ...añol MODELS 2MXS18NMVJU 3MXS24NMVJU 4MXS36NMVJU 2MXL18QMVJU 3MXL24QMVJU DAIKIN ROOM AIR CONDITIONER INSTALLATION MANUAL R410A Split Series Installation manual Manuel dinstallation Manual de instalación Manuel dinstallation ...

Page 2: ...amage accidents only DANGER Refrigerant gas is heavier than air and replaces oxygen A massive leak can lead to oxygen depletion especially in basements and an asphyxiation hazard could occur leading to serious injury or death Do not ground units to water pipes gas pipes telephone wires or lightning rods as incomplete grounding can cause a severe shock hazard resulting in severe injury or death Add...

Page 3: ... Dry Foreign materials including mineral oils such as SUNISO oil or moisture should be prevented from getting into the system b Tight R410A does not contain any chlorine does not destroy the ozone layer and does not reduce the earth s protection again harmful ultraviolet radiation R410A can contribute to the greenhouse effect if it is released Therefore take proper measures to check for the tightn...

Page 4: ...on radio wave conditions 8 In coastal areas or other places with salty atmosphere or one containing sulphate gas corrosion may shorten the life of the air conditioner 9 Since water will flow from the drain of the outdoor unit do not place under the unit anything which must be kept away from moisture NOTE Cannot be installed suspended from a ceiling or stacked CAUTION When operating the air conditi...

Page 5: ...ast 2 indoor units Cut thermal insulation pipe to an appropriate length and wrap it with tape making sure that no gap is left in the insulation pipe s cut line Wrap the insulation pipe with finishing tape from bottom to top 9 13 16 250 from wall Allow space for piping and electrical servicing Level mounting base available separately Where there is a danger of the unit falling use foot bolts or wire...

Page 6: ...tu The line set piping size is determined by the size of the indoor unit fittings Reducers are used at the outdoor unit to accommodate the correct gas line pipe size 3MXS24 3MXL24 4MXS36 Port 2MXS18 2MXL18 B 07 09 12 15 18 07 09 12 15 07 09 12 15 18 D 07 09 12 15 18 24 A 07 09 12 07 09 12 07 09 12 C 07 09 12 15 18 07 09 12 15 18 Use a reducer to connect pipes Use No 2 and 4 reducers Use No 5 and 6...

Page 7: ...tion port of outdoor unit Connection port of outdoor unit Be sure to attach the gasket No 5 No 6 Flare nut for φ3 8 inch 9 5mm Be sure to attach the gasket No 4 No 2 Flare nut for φ1 2 inch 12 7mm Be sure to attach the gasket Flare nut tightening torque φ3 8 inch 9 5mm φ1 2 inch 12 7mm φ5 8 inch 15 9mm 24 1 8 29 1 2ft Ibf 32 7 39 9N m 36 1 2 44 1 2ft lbf 49 5 60 3N m 45 5 8 55 5 8ft lbf 61 8 75 4N...

Page 8: ...0 Selecting a Location for Installation of the Indoor Units The maximum allowable length of refrigerant piping and the maximum allowable height difference between the outdoor and indoor units are listed below The shorter the refrigerant piping the better the performance Connect so that the piping is as short as possible Shortest allowable length per room is 10ft 3m If the outdoor unit is positione...

Page 9: ...10A Use a torque wrench when tightening the flare nuts to prevent damage to the flare nuts and gas leakage Align the centers of both flares and tighten the flare nuts 3 or 4 turns by hand then tighten them fully with a spanner and a torque wrench Do not apply refrigeration oil to the outer surface Flare nut Apply refrigeration oil to the inner surface of the flare Do not apply refrigeration oil to ...

Page 10: ... more than 550psi 3 8MPa for 1 hour minimum 24 hours recommended If there is a pressure drop check for leaks make repairs and perform the pressure test again 2 Connect the gauge manifold s charging hose to the gas stop valve s service port 3 Fully open the gauge manifold s low pressure valve Lo and completely close its high pressure valve Hi High pressure valve will require no further operation 4 ...

Page 11: ...e upside down to fill with liquid Filling other cylinders Turn the cylinder upside down when filling Be sure to use the R410A tools to ensure pressure and to prevent foreign objects entering 6 Charging with refrigerant If the total length of piping for all rooms exceeds the figure listed below additionally charge with 0 21oz ft 20g m of refrigerant R410A for each additional piping length Outdoor uni...

Page 12: ...9 16 5 8 inch 14 16mm I D 5 8 13 16 inch 16 20mm I D 5 16 13 32 inch 8 10mm 13 32 inch 10mm Min Minimum bend radius Piping thickness Thermal insulation size Thermal insulation thickness Liquid side Use separate thermal insulation pipes for gas and liquid refrigerant pipes 8 Flaring the pipe end 1 Cut the pipe end with a pipe cutter 2 Remove burrs with the cut surface facing downward so that the ch...

Page 13: ...terrupter malfunctioning Use an all pole disconnection type circuit breaker with at least 1 8 inch 3mm between the contact point gaps When carrying out wiring take care not to pull at the conduit Do not connect the power wire to the indoor unit Doing so may cause electric shock or fire Do not turn on the circuit breaker until all work is completed Method of Mounting Conduit When connecting indoor ...

Page 14: ...upply Shape the wires so that there is no lifting of the service hatch or other structural parts Use the specified wires and connect them securely Room A Room C Room D Room B power supply CAUTION Precautions to be taken for power supply wiring When using stranded wires make sure to use the round crimp style terminal for connection to the power supply terminal block Stranded wire Round crimp style t...

Page 15: ...ording to the operation mode of the set indoor unit 2 Priority during powerful operation If the indoor unit which is set for priority room setting is operating at powerful the capabilities of other indoor units will be somewhat reduced Power supply gives priority to the indoor unit which is set for priority room setting 3 Quiet operation priority Setting the indoor unit to quiet operation will mak...

Page 16: ...e is running cooling capacity will be saved Setting procedure Turn the night quiet mode switch SW6 1 to on COOL HEAT mode lock S15 Use the S15 connector to set the unit to only cool or heat Setting to only heat H short circuit pins 1 and 3 of the connector S15 Setting to only cool C short circuit pins 3 and 5 of the connector S15 The following specifications apply to the connector housing and pins...

Page 17: ...PC board switch cover 1 screw 4 Switch SW5 and SW6 to off 5 Turn the operation mode switch SW2 to COOL 6 Screw the service PC board switch cover back on 1 screw 7 Turn on the power 8 Push the forced operation switch SW1 above the service PC board cover The operation will start Forced cooling operation will stop automatically after about 10 minutes To stop the operation push the forced operation sw...

Page 18: ...ils on how to read the LED display refer to the collective indications label on the reverse side of the top plate or the service manual If self correction is not possible check the indoor unit wiring and piping in the usual manner Service PC board A 1 2 3 4 5 Wiring error check switch SW3 LED Status 1 2 3 4 All Flashing Automatic correction impossible Automatic correction completed Abnormal stop N...

Page 19: ...o a normal level 78 F to 82 F 26 C to 28 C in COOL operation 68 F to 75 F 20 C to 24 C in HEAT operation When operating the air conditioner in COOL operation in winter or HEAT operation in summer activate trial operation mode by following the instructions in the installation manual for the indoor unit The air conditioner draws a small amount of power in its standby mode If the system is not to be ...

Page 20: ...Two dimensional bar code is a manufacturing code 3P379970 8B M15B137 1511 HT ...

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