Lloyd LT48N, User Manual

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To indoor unit
Liquid side
Stop valve(open)
Cover
T-branch valve(open)
Hexagon wrench
Auxiliary cover
Vapor side
- 15 -
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.
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
Expelling the air
discharge air and moisture remaining in
the refrigerant system with a vacuum pump.
(For method of using a manifold valve,
refer to its operation manual.)
●
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.
●
Connect the charge hose connection to the vacuum pump.
●
Fully open the handle Lo of the manifold valve.
●
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.)
●
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).
●
Turn the stem of the packed valve B about 45
counter clock wise 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.
●
Remove the charge hose from the Low pressure
charge hose.
●
Fully open the packed valve stems B and A.
●
Securely tighten the cap of the packed valve.
※
If the A/C is filled with R410a, make sure to