50
Installation and Maintenance
Service Manual
Selection of Copper and Heat Insulation Materials
When using commercial copper pipes and ttings, observe the
following:
(1) Insulation material: Polyethylene foam
Heat transfer rate:0.041 to 0.052W/mK(0.035 to 0.045kca/(mh
o
C
Refrigerant gas pipes surface temperature reaches 110 max.
Choose heat insulation materials that will withstand this temperature.
(2) Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.
(3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
9. Checking for Gas Leakage
(1) Check for leakage of gas after air purging
(2) See the sections on air purges and gas leak checks in
the installation manual for the outdoor unit.
10. Attaching the Connection Pipe
●Attach the pipe after checking for gas leakage, described above.
(1) Cut the insulated portion of the on-site piping, matching it up with the connecting portion.
(2) Secure the slit on the refrigerant piping side with the butt joint on the auxiliary piping using the tape, making sure there are no gaps.
(3) Wrap the slit and butt joint with the included insulation sheet, making sure there are no gaps.
(1) Insulate the joint of the pipes securely. Incomplete insulation may lead to water leakage.
(2) Push the pipe inside so it does not place undue force on the front grille.
11. Connecting the Drain Hose
Insert the supplied C drain hose into the socket of the drain pan.
Fully insert the drain hose until it adheres to a seat of the socket.
12. Wiring
With a Multi indoor unit, install as described in the installation manual supplied with the Multi outdoor unit.
●Live the sensor securing plate, remove the front metal plate cover, and connect the branch wiring to the terminal block.
(1) Strip wire ends (15mm)
(2) Mach wire colours with terminal numbers on indoor and outdoor units terminal blocks and rmly screw wires to the corresponding
terminals.
(3) Connect the earth wires to the corresponding terminals.
(4) Pull wires to make sure that they are securely latches up, then retain wires with wire retainer.
(5) In case of connecting to an adapter system, Run the remote controller cable and attach the S21. (Refer to 11. When connecting go
an system.)
Gas pipe
Finising tape
Inter-unit wiring
Liquid pipe
Liquid pipe
insulation
Gas side Liquid side Gas pipe thermal insulation
Liquid pipe
thermal insulation
12K 18K 12K 18K
O.D. 9.55mm O.D. 12.7mm O.D. 6.4mm I.D. 12-15mm I.D. 14-16mm I.D. 8-10mm
Thickness 0.8mm Thickness 10mm Min.
Check for leakage here
Apply soapy water and ch-
eck carefully for leaking gas.
wipe soapy water off after
the check is complete.
Refrigerant
pipe
Refrigerant
pipe
Refrigerant
pipe
Slit
Slit
Tape
Auxiliary pipe
Seal
Drain pan
Seal
Drain hose
CAUTION
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