Daikin GYEQ20AN Service Manual page 63

SiAUY361411EA
7 Installing the Outdoor Unit
Normal vacuum drying
(1) Vacuum
drying:
(2) Vacuum
retention test:
Special vacuum drying
If there is a possibility of water invasion into the piping as is the case with piping work that takes a long
period of time or that is done during a rainy season, perform the special vacuum drying process described
below:
Vacuum break: Using nitrogen gas, pressurize the piping to 0.0490 MPa.
(1) Vacuum drying
Vacuum drying for two additional hours
Device Overview
Evacuate the piping from the fluid and gas (both intake gas and discharge gas for AFZP
models) sides of the outdoor unit's closing valve as well as from the servicing port. If a
negative pressure of -0.101 MPa or less is attained during continuous evacuation for
two hours or longer, then the vacuum drying process is complete.
- If a negative pressure of -0.101 MPa or less cannot be attained, continue evacuation
for one additional hour.
- If a negative pressure of -0.101 MPa or less cannot be attained over three hours,
conduct the air tightness test again.
After evacuating the piping to -0.101 MPa or less, leave it for one hour. If the gauge
reading is retained for one hour, then the vacuum retention test is successful.
- If the gauge reading has risen, chances are that there is moisture remaining inside the
piping or a leak exists. If this is the case, perform the special vacuum drying process
(described below) or conduct the air tightness test again.
(2) Vacuum break (N 0.0490MPa
2:
NO
Degree of vacuum reaches -0.101 MPa――
NO
Air tightness test again
(3) Vacuum drying (1 hour)
YES
――――――――――――
(4) Vacuum retention test
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Installation Work Manual
YES
0FGHP-EN0801 DGJ002
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