25
8.7 Evacuation
Evacuate at the check valve of liquid stop valve and both sides of the gas stop valve.
Operation procedure:
After reaching -100.7KPa or
less (below -755mmHg), let
the vacuum pump running
continuously for over 1hour.
Leakage test passe
d
Evacuation begins
Evacuation ends
Check vacuu
m
Charge refrigerant
Leave it for over 1
hour, vacuum pointer
does not arise.
If vacuum pointer arises, it shows there is water or leakage in the system,
please check and modify it, and then evacuate again.
Because the unit is with refrigerant R410A, the below issues should be paid attention:
■
To prevent the different oil into the pipe, please use the special tool for R410A, especially for gauge manifold and
charging hose.
■
To prevent the compressor oil into the refrigerant cycle, please use the anti-counter-flow adapter.
Check valve operation
Open/close method:
■
Take down the valve cap.
■
Turn the liquid stop valve and the gas stop valve with hexangular spanner until it stops. If opening the valve
strongly, the valve will be damaged.
■
Tighten the valve cap.
Tighten torque as the table below:
Stop valve dimension
Tighten torque N·m (clockwise rotation is close)
Shaft (valve body)
Cap (cover)
(Check joint)
φ9.52
5~6
13~16
8~10
φ15.88
8~9
20~25
φ19.05
8~9
22~27
