Airwell YCV280, Installation And Maintenance Instructions Manual

Page: 275 / 412

e. After confirmation of a~d, if pressure goes down, there is leakage. Check the brazing position, flared
position by laying on the soap. modify the leakage point and take another leakage test.
4) After leakage test, must execute the evacuation.
gauge manifold
Lo Hi
Lo handle
Hi handle
Operation procedure:
Evacute at the check valve of liquid stop valve and both sides of the gas stop valve. The oil
equalization pipe also must be vacuum (executed at the oil equalization pipe check valve
respectively).
leakage test passed
evacuation begins
evacuation ends
check vacuum
charge refrigerant
after reaching -101KPa 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.
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.
When maintaining the outdoor, release refrigerant from check valve. When taking vacuum
evacuation, set the relative dip switch, the detailed refers to Page 38.
Because the unit is with refrigerant R410A, the below issues should be paid attention:
. Evacuation
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