AEG EPN09C38HW, Installation Manual

Page: 19 / 112

19 ENGLISH
4. Operate the vacuum pump to
evacuate. After starting evacuation,
slightly loose the flare nut of the Low
Side valve on the gas pipe side and
check if the air is entering (Operation
noise of the vacuum pump changes
and a compound meter indicates 0
instead of minus), then tighten the
flare nut. The procedure verifies if
there are blocks inside the tubes.
5. Make evacuation for 15 minutes or
more and check that the compound
meter indicates -7-3/5 x 10 Microns
Hg (-1x10 Pa). After the evacuation
is completed, fully close the Low Side
handle of the manifold valve and stop
the operation of the vacuum pump.
6. Turn the stem of the packed valve B
about 45° counter clockwise for 6~7
seconds after the gas comes out, then
tighten the flare nut again. Make sure
the pressure display in the pressure
4. TEST AND RUNNING
4.1 Gas Leakage Check
1. Soap water method
• Apply a soap water or a liquid
neutral detergent on the indoor
unit connection or outdoor unit
connections (A: Low side valve, B:
High side valve, C and D are ends
of indoor unit connection) by a soft
brush to check for leakage of the
connecting points of the piping. If
bubbles come out, the pipes have
leakage point.
Fig.4.1
Indoor unit
check points
Liquid pipe
Gas pipe
Outdoor
Unit
Outdoor unit
check points
2-way
valve
3-way
valve
B
D
C
A
2. Leak detector
• Use the leak detector to check for
leakage.
4.2 Electrical Safety Check
Perform the electric safety check after
completing installation:
1. Earthing work
•
After finishing earthing work, measure
the earthing resistance by visual
detection and earthing resistance
tester.
2. Electrical leakage check (performing
during test running)
•
During test operation after finishing
installation,the service person
can use the electric probe and
multimeter to perform the electrical
leakage check. Turn off the unit
immediately if refrigerant leakage
happens. Check and find out
thesolution ways till the unit operate
properly.
indicator is a little higher than the
atmospheric pressure. This procedure
verifies if the refrigerant goes through
the tubes correctly.
7. Close the schrader valve, then remove
the valve core tool. Replace the
charging port cap.
8. Fully open the packed valve stems B
and A.
9. Securely tighten the cap of the packed
valve.
Fig.3.6.3
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