7 | Piping installation
Installer reference guide
42
2MXM-A, 3MXM-A, 4MXM-A, 5MXM-A
R32 Split series
4P600463-5E – 2021.12
▪ After handling the stop valve, tighten the stem cap, and check for refrigerant
leaks.
Stem cap Width across flats (mm) Tightening torque (N∙m)
Liquid side 19 18~20
Gas side 22 21~28
To handle the service cap
▪ ALWAYS use a charge hose equipped with a valve depressor pin, since the service
port is a Schrader type valve.
▪ After handling the service port, tighten the service port cap, and check for
refrigerant leaks.
Item Tightening torque (N∙m)
Service port cap 11~14
7.2.8 To connect the refrigerant piping to the outdoor unit
▪ Piping length. Keep field piping as short as possible.
▪ Piping protection. Protect the field piping against physical damage.
1 Connect the liquid refrigerant connection from the indoor unit to the liquid
stop valve of the outdoor unit.
a Liquid stop valve
b Gas stop valve
c Service port
2 Connect the gas refrigerant connection from the indoor unit to the gas stop
valve of the outdoor unit.
NOTICE
It is recommended that the refrigerant piping between indoor and outdoor unit is
installed in a ducting or the refrigerant piping is wrapped with finishing tape.
7.3 Checking the refrigerant piping
7.3.1 About checking the refrigerant piping
The outdoor unit's internal refrigerant piping has been factory tested for leaks. You
only have to check the outdoor unit's external refrigerant piping.
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