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Installation
Installer reference guide
67
C08AF + EHYKOMB33A
Daikin Altherma R Hybrid
4P471761-1E – 2020.10
7.7.4 To perform vacuum drying
Connect the vacuum pump and manifold as follows:
a
h
b
f
h
i
e
c
d
e
g
j
a
Pressure meter
b
Gauge manifold
c
Low-pressure valeve (Lo)
d
High-pressure valve (Hi)
e
Charging hoses
f
Vacuum pump
g
Service port
h
Valve lids
i
Gas stop valve
j
Liquid stop valve
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.
INFORMATION
After opening the stop valve, it is possible that the pressure in the refrigerant piping
does NOT increase. This might be caused by e.g. the closed state of the expansion
valve in the outdoor unit circuit, but does NOT present any problem for correct
operation of the unit.