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AIR PURGING
4. Operate the vacuum pump to evacuate. After
starting the evacuation, slightly loosen the flare
nut of the Lo valve on the gas pipe side and
check that the air is entering(operation noise
of the vacuum pump changes and a
compound meter indicates 0 instead of minus).
5. After the evacuation is complete, fully close
the handle Lo of the
the operation of the vacuum pump. The
evacuation should take fifteen minutes or more.
compound meter indicates that the compound
meter indicates
5
-1x10 Pa
(
-76cmHg
6. Turn the stem of the packed valve B about
o
45 counterclockwise for 6-7 seconds after
the gas comes out, then tighten the flare nut
again. Make sure the pressure display in the
pressure indicator is a little higher than the
atmosphere pressure.
7. Remove the charge hose from the Low
pressure charge hose.
8. Fully open the packed valve stems B and A.
9. Securely tighten the cap of the packed valve.
10. If the outdoor unit uses all vacuum valves,
and the vacuum position is at the main valve,
the system is not connected with the indoor
unit and must be tightened with a screw nut.
Check the gas leakage before operation
to prevent leakage.
Safety and leakage check
●
Electrical safety check
Perform the electric safe check after
completing installation:
1. Insulated resistance
The insulated resistance must be more than 2
2. Grounding work
After finishing the grounding work, measure the
grounding resistance by visual detection and
grounding resistance tester. Make sure the
grounding resistance is less than 4 .
3. Electrical leakage check (performing during
test running)
During the test operation after finishing the installation,
the serviceman can use the electroprobe and
multimeter to perform the electrical leakage
check. Turn off the unit immediately if leakage
occurs Check and find out the solution.
Do not use the unit until repairs are made to
resolve the leak.
manifold valve and stop
).
Ω
Manifold valve
Compound meter
-76cmHg
Handle Lo
Charge hose
Low pressure valve
Ω
.
Outdoor unit
check point
36
Pressure gauge
Handle Hi
Charge hose
Vacuum pump
Fig.67
Fig.68
n m k
Indoor unit
check point
f
C
e
d
B
c
b
A
a
Fig. 69
j i h
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