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1. The outdoor unit has been executed the leakage test in the factory. The pipe should be executed leakage test
individually and forbidden to test after connecting with check valve.
2. Refer to the below gure to charge the nitrogen into the unit to take a test. Never use the chlorine, oxygen and
ammable gas in the leakage test. Apply pressure on both gas pipe and liquid pipe.
3. Applying pressure step by step.
a. Apply the pressure to 0.5MPa for more than 5 minutes, then conrm if pressure goes down.
b. Apply the pressure again to 1.5MPa for more than 5 minutes, then conrm if pressure goes down.
c. Apply the pressure nally to the target pressure (4.15MPa), record the temp. and the pressure.
d. Leave it at 4.15MPa for over 1 day, if pressure does not go down, the test is passed. Meanwhile, when the temp.
changes for 1degree, pressure will change 0.01MPa as well. Correct the pressure.
e. After conrmation of a~d, if pressure goes down, there is leakage. Check the brazing position and aring position
with soap. Repair the leakage point and take another leakage test.
4. After leakage test, please make sure to execute the evacuation.
B. Leakage test
C. Evacuation
Evacuate at the check valve of both liquid side and gas side. The oil equalization pipe also must be vacuumed
(executed at the oil equalization pipe check valve respectively).
Nitrogen
Hi handle
Gauge manifold
Hi
To indoor
Lo
Lo handle
Leakage test passed
Leave it for over 1
hour, vacuum pointer
does not arise.
After reaching -101kPa or
less (below -755mmHg), let
the vacuum pump running
continuously for over 1hour.
Charge refrigerant
Evacuation begins
Check vacuum
Evacuation ends
If vacuum pointer arises, it shows there is water or leakage in
the system, please check and repair it, and then evacuate again.
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