Daikin 2MXL18QMVJU Installation Manual Download

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English

Wiring

[Wiring procedure]

1) Strip the insulation from the wire (3/4inch (20mm)).
2) Connect the inter-unit wires between the indoor and

outdoor units

so that the terminal numbers match.

Tighten the terminal screws securely. It is recommended

that a flathead screwdriver be used to tighten the screws.

3) Be sure to match the symbols for wiring and piping.

4) Pull the wire lightly to make sure that it does not

disconnect.

5) Pass the wiring through the cutout on the bottom of the

protection plate and attach the protection plate.

6) After completing the work, reattach the service lid to its

original position.

Circuit breaker

Ground fault circuit

interrupter

Outdoor unit

60Hz 208/230V

Be sure to use the dedicated circuits.

To room B

To room C

To room D

Use AWG 16 or AWG 14 wire for

the power supply and inter-unit

wires.

Room

Room A

Room

Indoor unit

If the length of a connection wire

is 33ft (10m) or more, use AWG14 wire.

power supply

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
terminal

Arrow view

Flat washer

Screw

Round

crimp-style

terminal

Good

Round crimp-
style terminal

Flat washer

Screw

Wrong

Flat washer

Round crimp-
style terminal

Screw

Good

Round crimp-
style terminal

Flat washer

Screw

Wrong

Flat washer

Round crimp-
style terminal

Screw

Flat washer

Screw

Round

crimp-style

terminal

Arrow view

•

When connecting the inter-unit wires to the terminal block using a single core wire, be sure to curl the end of the lead.

Improper work may cause heat and fires.

Strip wire end
to this point.

Excessive strip length

may cause electric shock

or current leakage.

Stripping wire at terminal block

Good

Wrong

Good

Wrong

Ground

This air conditioner must be grounded. For grounding, follow all local, and state electrical codes.

01_EN_3P379970-8B.indd 13

11/17/2015 9:11:17

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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