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Piping installation
Installer reference guide
43
2(A)MXM40+50 + 2(A)MXF40+50
R32 Split series
4P600463-3D – 2021.03
7.3.4 To perform vacuum drying
DANGER: RISK OF EXPLOSION
Do NOT start the unit if it is vacuumed.
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.