15
Expelling the air in the pipes and the indoor unit
★
Expelling the air: humid air in the
refrigerating system might cause troub le
of compre ssor.
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 and close the valve.
Check whether there is air leakage at
all connection parts of pipes.
Push the to p rod of T-branch val ve 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 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 g as p ipe side.
2.Connect t he charge hose connection to the vacuum pum p.
3.Fully open the handle Lo of the manifold valve.
4.Operate the vacuum p ump 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 o f the vacuum pum p changes and a compound meter indicates
0 instead of minus.)
5.After the evacuation is comple te, fully
close the handle 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 counterclockwise f or 6~7 secon ds
after t he 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 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 o f the packed
valve.
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dis cha rge air and moi sture
remain ing in th e re frigerant system wi th a vac uum pump.
If t he A/C is filled with R410a, make sure to
Outdoor unit
To indoor un it
Liquid side
Gas side
Stop valve(ope n)
Cover
T-branch valve(open)
Hexagon wrench
Auxiliary cov er
Vapo r side
A
B
C
D
Packed valve
Ha lf union
Re frigerant
Outdoor
unit
In door
unit
Gas side
Liquid side
Manifold valve
Co mpound meter Pressure gau ge
-76cmHg
Ha ndle Lo
Ch arge hose
Low pressure va lve
Vacuum pump
Ch arge hose
Ha ndle Hi
5