To Perform Vacuum Drying - Daikin ERGA04EAV37 Installer's Reference Manual

8.3.4 To perform vacuum drying

ERGA04~08EAV3+V3A+V37 + EHSH/X(B)04+08P30+50EF
Daikin Altherma 3 R ECH₂O
4P678716-1A – 2022.07
1 Charge the system with nitrogen gas up to a gauge pressure of at least
200 kPa (2 bar). It is recommended to pressurize to 3000 kPa (30 bar) in order
to detect small leaks.
2 Check for leaks by applying the bubble test solution to all connections.
3 Discharge all nitrogen gas.
Connect the vacuum pump and manifold as follows:
a d h
b
c
e
f
g h i
a Pressure meter
b Gauge manifold
c Low pressure valve (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...
Does not change
Increases
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
Make sure to open the stop valves after installing the refrigerant piping and
performing vacuum drying. Running the system with the stop valves closed may
break the compressor.
j
There is no moisture in the system.
This procedure is finished.
There is moisture in the system. Go
to the next step.
8 Piping installation
|
Then...
Installer reference guide
99