15
Installation procedure
Evacuate at the check valve of liquid stop valve and both sides of the gas stop valve.
Because the unit is with refrigerant R410A, the below issues should be paid attention:
Tighten torque as the table below:
Charge the additional refrigerant as liquid state with the gauge.
If the additional refrigerant can not be charged totally when the outdoor stops, charge it at the
trial mode.
If the unit runs for a long period in the state of lack of refrigerant, compressor will occur failure.
( the charging must be nished within 30 minutes especially when the unit is running, meanwhile
charging the refrigerant).
Tighten torque N·m
For gas pipe Less than 7 Less than 30 13
Shaft
(Valve body)
For liquid
Pipe
7.85
(MAX15.7)
29.4
(MAX39.2)
8.8
(MAX14.7)
Cap
(Cover)
T-shape nut
(check joint)
Open/close method:
after reaching -101KPa or less
(below -755mmHg), let the
vacuum pump running
continuously for over 1hour.
if vacuum pointer arises, it shows there is water or leakage in the
system, please check and modify it, and then evacuate again.
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.
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.
leave it for over 1
hour, vacuum
pointer does not
arise.
leakage test passed
evacuation begins
evacuation ends
check vacuum
charge refrigerant
Operation procedure:
C. Evacuation
D. Check valve operation
E. Additional refrigerant charging
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