7 | Piping installation
Installer reference guide
41
4MWXM-A
R32 Split series
4P678385-1A – 2022.02
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.
To air-conditioning unit:
a1 Liquid stop valve
b1 Gas stop valve
c1 Liquid service port
d1 Gas service port
To DHW tank:
a2 Liquid stop valve
b2 Gas stop valve
d2 Gas 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.
If there is a possibility of moisture being present in the refrigerant piping (for
example, water may have entered the piping), first carry out the vacuum drying
procedure below until all moisture has been removed.
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