Daikin 2MXM40M4V1B - To Perform Vacuum Drying

7 | Piping installation
Installer reference guide
44
2(A)MXM40+50 + 2(A)MXF40+50
R32 Split series
4P600463-2C – 2020.08
2 Check for leaks by applying the bubble test solution to all connections.
3 Discharge all nitrogen gas.
7.3.4 To perform vacuum drying
Connect the vacuum pump and manifold as follows:
g
f
d
e
a c
b
j
i
h
h
k
a Low pressure gauge
b Gauge manifold
c High pressure gauge
d Low-pressure valve (Lo)
e High-pressure valve (Hi)
f Charging hoses
g Vacuum pump
h Valve caps
i Service port
j Gas stop valve
k Liquid stop valve
NOTICE
Connect the vacuum pump to both the service ports of the gas stop valves.
1 Vacuum the system until the pressure on the manifold indicates −0.1 MPa
(−1bar).
2 Leave as is for 4-5minutes and check the pressure:
If the pressure… Then…
Does not change There is no moisture in the system.
This procedure is finished.
Increases There is moisture in the system. Go
to the next step.
3 Vacuum the system for at least 2hours to a manifold pressure of −0.1MPa
(−1bar).
4 After turning the pump OFF, check the pressure for at least 1hour.
5 If you do NOT reach the target vacuum or CANNOT maintain the vacuum for
1hour, do the following:
▪ Check for leaks again.
▪ Perform vacuum drying again.
NOTICE
Be sure to open the gas stop valve after piping installation and vacuuming. Running
the system with the valve closed, the compressor may break down.