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3.3.3 Piping connection
After connecting the pipes, remove the caps of stop valves for gas and liquid.
Tighten the open-close spindle in the closing direction according to the following tightening
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 attention to the flame 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 portions such as wall, ceiling, etc. Otherwise, abnormal sound may
be heard due to vibration 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 connecting part.
5 As for the flaring work of the field pipe, use the specified tightening torque.
6 Insulate the gas pipe and liquid pipe completely.
7 Mount the pipe cover equipped with the outdoor unit after connecting the pipes.
Otherwise, the unit may be damaged due to snow or rainwater entering the pipes.
3.3.4 Stop valve
Follow the restrictions for refrigerant piping (permissible length, height difference). If not, the
outdoor unit may be damaged or fail.
The stop valves shall be closed completely (factory setting) when the refrigerant piping connection
is performed. Do not open the stop valves until all the refrigerant piping connections, air-tight test
and vacuuming have been completed.
PMML0628 rev.0 - 05/2023
Pipe size Ø (mm)
Tightening Torque (Nm)
6.35
9.52
12.7
15.88
19.05
14 to 18
34 to 42
49 to 61
68 to 82
100 to 120
3
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