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11
Installation instruction
• Protect the pipe ends from getting water and other impurities into
the pipes (from welding, led or being sealed with adhesive tape).
• The refrigerant pipe should be clean. The nitrogen should ow at
pressure around 29PSI(0.2Mpa) and when charging the nitrogen,
stop up the end of the pipe by hand to increase the pressure in the
pipe, then move your hand and stop up the other end.
• Close the valves fully when connecting the pipes.
• When welding the valve and pipes, use a wet cloth to cool down the valve and
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
29PSI
(0.2MPa)
• Weld the pipe while charging with nitrogen or it will cause impurities (including
a lm of oxidation) to clog the capillary and the expansion valve which may lead
to deadly accidents.
1. The outdoor unit has been tested for leakages from the factory. After connecting the distributing pipe, test for leakages
from the outdoor check valve and the indoor pipe. While testing, the valves should be close.
2. Refer to the below gure to charge nitrogen into the unit to test. Never use chlorine, oxygen, ammable gas for the
leakage test. Apply pressure on both the gas pipe and the liquid pipe.
3. Apply the pressure step by step to the target pressure.
a. Pressurize to 72.5PSI(0.5MPa) for more than 5 minutes, check if pressure goes down.
b. Pressurize to 217.5PSI(1.5MPa) for more than 5 minutes, check if pressure goes down.
c. Pressurize to the target pressure 580PSI(4.0MPa), record the temp. and the pressure.
d. Leave it at 4.0MPa for 1 day or more, if the pressure does not go down, the test is complete.
Note that when the temp. changes
by 1degree, pressure will change
1.45PSI(0.01MPa). Correct
the pressure as needed.
e. After performing a~d, if the pressure
goes down, there is leakage. Check
any brazed and ared connections
using soapy water. Fix the leakage and
perform test again.
4. After the leakage test evacuate the
system.
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
gauge does not arise.
after reaching -14.645PSI
(101KPa) or less (below
-755mmHg), let the vacuum
pump run continuously for 1
hour or more.
Charge refrigerant
Evacuation begins
Check vacuum
Evacuation ends
if vacuum needle rises, it shows there is water or leakage in the
system, please correct the problem and then evacuate again.
Evacute at the liquid service valve and both sides of the gas service valve.
Operation procedure:
(7) Evacuation
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