7
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Piping installation
Installer reference guide
39
2MXM-A9, 3MXM-A9, 4MXM-A9, 5MXM-A9
R32 Split series
4P600463-7G – 2022.09
c
Reducer no. 3
d
Flare nut for Ø15.9 mm
e
Inter-unit piping
▪
Connecting a Ø9.5 mm pipe to a Ø15.9 mm gas pipe connection port
a
b
d
e
c
a
Outdoor unit connection port
b
Reducer no. 6
c
Reducer no. 5
d
Flare nut for Ø9.5 mm
e
Inter-unit piping
▪
Connecting a Ø9.5 mm pipe to a Ø12.7 mm gas pipe connection port
a
b
d
e
c
a
Outdoor unit connection port
b
Reducer no. 2
c
Reducer no. 4
d
Flare nut for Ø12.7 mm
e
Inter-unit piping
Coat the threaded connection port of the outdoor unit where the flare nut comes
in with refrigeration oil.
Flare nut for (mm)
Tightening torque (N•m)
Ø9.5
33~39
Ø12.7
50~60
Ø15.9
62~75
NOTICE
Use an appropriate wrench to avoid damaging the connection thread by
overtightening the flare nut. Be careful NOT to overtighten the nut, or the smaller
pipe may be damaged (about 2/3-1× the normal torque).
7.2.7 Using the stop valve and service port
To handle the stop valve
Take the following guidelines into account:
▪
The stop valves are factory closed.
▪
The following figure shows the stop valve parts required when handling the
valve.
c
d
a
b
a
Service port and service port cap
b
Valve stem
c
Field piping connection
d
Stem cap
