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PMML0628 rev.0 - 05/2023
3
PIPE CONNECTION
PIPING WORK AND REFRIGERANT CHARGE
3.3.3 Piping connecon
Aer connecng the pipes, remove the caps of stop valves for gas and liquid.
Tighten the open-close spindle in the closing direcon according to the following ghtening
torque.
1 Make sure that the stop valves are closed.
2 Fill pipes with nitrogen gas before brazing.
3 Protect the compressor and sound-proof cover with a metal plate when brazing the gas pipe.
! CAUTION
Pay aenon to the ame of the burner does not burn the stop valve body.
4 Connect the indoor unit and outdoor units with refrigerant piping. Fix the pipes and take special
care no to contact with weak porons such as wall, ceiling, etc. Otherwise, abnormal sound may
be heard due to vibraon of the piping.
NOTE
Where pipes are buried in situ with joints such as elbows or sockets, provide a service access door
to facilitate checking of the connecng part.
5 As for the aring work of the eld pipe, use the specied ghtening torque.
6 Insulate the gas pipe and liquid pipe completely.
7 Mount the pipe cover equipped with the outdoor unit aer connecng the pipes.
Otherwise, the unit may be damaged due to snow or rainwater entering the pipes.
6.35 14 to 18
9.52 34 to 42
12.7 49 to 61
15.88 68 to 82
19.05 100 to 120
3.3.4 Stop valve
Follow the restricons for refrigerant piping (permissible length, height dierence). If not, the
outdoor unit may be damaged or fail.
The stop valves shall be closed completely (factory seng) when the refrigerant piping connecon
is performed. Do not open the stop valves unl all the refrigerant piping connecons, air-ght test
and vacuuming have been completed.
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