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Expelling the air in the pipes and the indoor unit
Expelling the air: humid air in the
refrigerating system might cause trouble
of compressor.
● Take off the cover from the stop valve
and T-branch valve.
● Take off the auxiliary cover from the
T-branch valve.
● Turn the stop valve rod anti-clock wise
to an angle of 90 degree, keep it open
for 8 seconds and close the valve.
● Check whether there is air leakage at
all connection parts of pipes.
● Push the top rod of T-branch valve by
hexagon wrench to expel air.
● Repeat the third and fifth steps.
● Open the stop and T-branch valve with
a hexagon wrench to make the unit
operate.
● There is no leakage allowed, please
check all the piping connection parts.
You must test the leakage, generally,
it can be tested by soap water.
●
If the A/C is filled with R410a, make sure to
remaining in the refrigerant system with a vacuum pump.
(For method of using a manifold valve, refer to its operation manual.)
1.completely tighten the flare nuts, A, B, C, D, connect the manifold valve charge
hose to a charge port of the low-pressure valve on the gas pipe side.
2.Connect the charge hose connection to the vacuum pump.
3.Fully open the handle Lo of the manifold valve.
4.Operate the vacuum pump to evacuate. After starting evacuation, slightly loose
the flare mut 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 manifold valve
and stop the operation of the vacuum
pump. Make evacuation for 15 minutes or
more and check that compound meter
indicates -76cmHg(-1×10 Pa).
6.turn the stem of the packed valve B about
45 counterclockwise for 6~7 seconds
after the gas coming out, then tighten the
flare nut again. Make suer 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.
Vapor side
Auxiliary cover
discharge air and moisture
5
- 13 -
Outdoor unit
To indoor unit
T-branch valve(open)
Hexagon wrench
Refrigerant
Outdoor
unit
A
Gas side
Liquid side
B
Packed valve
Manifold valve
Compound meter
-76cmHg
Handle Lo
Charge hose
Low pressure valve
Liquid side
Gas side
Stop valve(open)
Cover
Indoor
unit
C
D
Half union
Pressure gauge
Handle Hi
Charge hose
Vacuum pump
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