15
Expelling the air in the pipes and the indoor unit
★
Expelling the air: humid air in the
refrigerating system m ight cau se troub le
of compressor.
Take off the cover from the stop valve
and T-branch valve.
Take off the aux iliary cover from the
T-bran ch v alve .
Turn the stop valve rod anti-clock wise
to an angle of 9 0 degree, keep it open
for 8 secon ds a nd 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 valv e with
a h exagon wrench to make the unit
operate.
There is no leakage allowed, please
check all the piping con nection parts.
You must test the leakage, generally,
it can be tested by soap water.
(For method of usin g a manifold valve, refer to its operation manual.)
1.comp letely tighten the flare nuts, A, B, C, D , connect the manifold valve charge
hose to a charge port of the low-pressu re valve on the gas pipe side.
2.Connect the charge hose connection to the vacuum pump.
3.Fully open the handle Lo of the ma nifold valve.
4.Operate the vacuum p ump to evacuate. After starting evacuation, slightly loo se
the flare mut of the Lo valve on the gas pipe side and check that the air is entering
(Operation noise o f the vacuum pum p changes and a compound meter indicates
0 instead of minus.)
5.A fter the evacuation is complete, fully
close the hand le Lo of the manifold valve
and stop the operation of the vacuu m
pump. Make evacu ation for 15 minutes or
more and check that compound meter
indicates -76cmHg(-1 10 Pa).
6.turn the stem of th e packed valve B about
45 counte rclockwise for 6~7 secon ds
after the gas coming out, then tighten the
flare n ut again. Make suer the pressure
display in the pressure indicator is a little
higher than the atm osphere pressure.
7.Remove the charge hose from the Low
pressure charge hose.
8.Fully open the packed valve stems B
and A.
9.S ecurely tighten the cap o f the packed
valve.
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dis cha rge air and moisture
remaining in th e refrigerant system with a vacuum pump.
If the A/C is filled with R410a, make sure to
Outdoor unit
To indoor un it
Liquid side
Gas side
St op valve(ope n)
Cover
T-branch valve(open)
Hexagon wrench
Auxiliary cover
Vapor side
A
B
C
D
Packed valve Half union
Refrigerant
Outdoor
unit
Indoor
unit
Gas side
Liquid side
Manifold valve
Compound meter Pressure gauge
-76cmHg
Handle Lo
Charge hose
Low pressure valve
Vacuum pump
Charge hose
Handle Hi
5