12
C. Evacuation
Evacute at the check valve of liquid stop valve and both sides of the gas stop valve.
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.
Because the unit is with refrigerant R410A, the below issues should be paid attention:
Tighten torque as the table below:
less than 7
7.85
(MAX15.7)
less than 30
29.4
(MAX39.2)
13
8.8
(MAX14.7)
shaft
(valve body)
cap
(cover)
T-shape nut
(check joint)
Tighten torque N.m
for gas pipe
for liquid
pipe
D. 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.
Operation procedure:
after reaching -100.7KPa or
less (below -755mmHg), let
the vacuum pump running
continuously for over 1hour.
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.
E. Additional refrigerant charging
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 finished within 30 minutes especially when the unit is running, menawhile
charging the refrigerant).
Installation procedure
