Haier AU052FNERA - Leakage test; Evacuation

11
Installation instruction
• Protect the pipe end against the water, impurity into the pipes
(welding after being at, or being sealed with adhesive tape).
• The refrigerant pipe should be clean. The nitrogen should ow under
the pressure of about 0.2Mpa and when charging the nitrogen, stop
up the end of the pipe by hand to enhance the pressure in the pipe,
then loose the hand (meanwhile stop up the other end).
• When connecting the pipes, close the valves fully.
• When welding the valve and the pipes, use the wet cloth to cool down the
valve and the pipes.
Seal the pipe end with
adhesive tape or the stopper
to increase the resistance, ll
up the pipe with nitrogen.
Only nitrogen gas
can be used
Brazing
<N2>
Taping
Adhesive tape
Flat
Brazing
1st side
Hand
2nd side
Source valve
0.2MPa
• Weld the pipe at the same time charge the nitrogen. Or it will cause a number
of impurity (a lm of oxidation) to clog the capillary and the expansion valve,
further cause the deadly failure.
1. The outdoor unit has been executed the leakage test in the factory. After connecting the distributing pipe, execute the
leakage test from the outdoor check valve and the indoor. Besides, while testing, the valves should be close.
2. Refer to the below gure to charge the nitrogen into the unit to take a test. Never use the chlorin, oxygen, ammable
gas in the leakage test. Apply pressure both on the gas pipe and the liquid pipe.
3. Apply the pressure step by step to the target pressure.
a. Apply the pressure to 0.5MPa for more than 5 minutes, conrm if pressure goes down.
b. Apply the pressure to 1.5MPa for more than 5 minutes, conrm if pressure goes down.
c. Apply the pressure to the target pressure (4.0MPa), record the temp. and the pressure.
d. Leave it at 4.0MPa 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
p r e s s u r e .
e. After conrmation of a~d, if pressure
goes down, there is leakage. Check
the brazing position, ared position by
laying on the soap. modify the leakage
point and take another leakage test.
4. After leakage test, must execute the
evacuation.
Nitrogen
Hi handle
Gauge manifold
Hi
To indoor
Check valve
Gas pipe
Gas pipe
Check hole
Outdoor
Lo
Lo handle
(6) Leakage test
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 modify it, and then evacuate again.
Evacute at the check valve of liquid stop valve and both sides of the gas stop valve.
Operation procedure:
(7) Evacuation