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Piping installation
Installer reference guide
41
2MXM-A9, 3MXM-A9, 4MXM-A9, 5MXM-A9
R32 Split series
4P600463-7G – 2022.09
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.
b
c
a
c
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.
Before checking the refrigerant piping
Make sure the refrigerant piping is connected between the outdoor unit and the
indoor unit.
Typical workflow
Checking the refrigerant piping typically consists of the following stages:
1
Checking for leaks in the refrigerant piping.
2
Performing vacuum drying to remove all moisture, air or nitrogen from the
refrigerant piping.
