22
When Using the Vacuum Pump
Gas Leakage Check
Test and Running
Electrical Safety Check
1
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and D, connect the manifold valve charge
hose (blue) to the charge port of the low
pressure valve (3-way valve) on the gas pipe
side.
2 Connect the other charge hose (yellow) of
manifold to the vacuum pump.
3 Fully open the handle Lo of the manifold
valve.
4 Open the vacuum pump for vacuumization.
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of the low pressure valve to check if there
is air coming inside (If operation noise of
the vacuum pump has been changed, the
reading of multimeter is 0 instead of minus).
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5 Keep vacuuming for more than 15 minutes
and make sure the reading of multimeter is
[
5
Pa (-76cmHg). Then fully close
the handle Lo of manifold valve and stop the
operation of the vacuum pump.
6 Turn the stem of the stop valve B (2-way
valve) about 45° counterclockwise for 6~7
seconds after the gas coming out, then
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pressure display in the pressure indicator is a
little higher than the atmosphere pressure.
7 Remove the charge hose from the low
pressure charge port.
8 Fully open the valve stems of A (3-way valve)
and B (2-way valve).
9 Securely tighten the stem cap.
1 Soap water method:
Apply soap water or liquid neutral detergent on
all valves and pipe connections (A, B, C and D,
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by a soft brush to check for leakage.
If bubbles come out, the pipes have leakage.
2 Leak
detector
Use the leak detector to check for leakage.
Perform the electric safe check after completing the
installation:
1 Earthing
work
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earthing resistance by visual detection and
earthing resistance tester.
2 Electrical leakage check
(performing during test running)
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the service person can use the electric probe
and multimeter to perform the electrical leakage
check. Turn off the unit immediately if refrigerant
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solution ways till the unit operate properly.
Outdoor Unit
Manifold
valve
Multimeter
-76cmHg
Lo Handle
Hi Handle
Charging hose
Low pressure
valve
Charging
hose
Vacuum Pump
Indoor unit
check points
Liquid pipe
Gas pipe
Outdoor
Unit
Outdoor unit
check points
2-way
valve
3-way
valve
B
D
C
A
