Daewoo DMB-1822LH, User Manual

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Evacuation
1. Attach the charge hose end described in the leak test
area to a vacuum pump to evacuate the air remaining
at the tubing and indoor unit.
Confirm the ÒLoÓ knob of the manifold valve is open.
Then, run the vacuum pump. The operation time for
evacuation varies with the tubing length and capacity of
the pump. The following table shows the amount of
time for evacuation:
2. When the desired vacuum is reached, close the ÒLoÓ knob
of the manifold valve and stop the vacuum pump.
Finishing the job
1. With a hex wrench, turn the narrow tube service valve
stem counter-clockwise to fully open the valve.
2. Turn the wide tube service valve stem counter-clockwise
to fully open the valve.
To avoid gas from leaking when removing the charge hose,
make sure the wide tube service valve is fully open and
Model
DMB-1822LH
DMB-1832LH
DMB-2112LH
DMB-2122LH
STANDARD
LENGTH(m)
INDOOR
UNIT
Change am't(g)
per 1m
5
A 15
15
15
15
15
15
6
15
B
A
B
A
B
A
B
5
5
5
turned all the way out.
3. Loosen the charge hose connected to the wide tube ser
-
vice port slightly to release the pressure, then remove the
hose.
4. Replace the threaded cover on the wide tube service port
and fasten it securely. This process is very important to
prevent gas from leaking from the system.
5. Replace the valve caps at both wide and narrow service
valves and fasten them securely.
This completes air purging with a vacuum pump. The air
conditioner is now ready to test run..
If tubing length is less than
33 ft. (10 m)
10 min. or more
If tubing length is longer than
33 ft. (10 m)
15 min. or more
Required time for evacuation when 30 gal/h vacuum
pump is used
CAUTION:
CAUTION:
Freon Extra Charge
To avoid nitrogen entering the refrigerant system in a liquid
state, the top of the nitrogen gas cylinder must be higher than its bottom when you pressurize the system. Usually, the
cylinder is used in a vertical standing position.
4. Do a leak test of all joints of the tubing (both indoor and outdoor) and both wide and narrow service valves. Bubbles
indicate a leak. Be sure to wipe off the soap with a clean cloth.
5. After the system is found to be free of leaks, relieve the nitrogen pressure by loosening the charge hose connector at
the nitrogen cylinder. When the system pressure is reduced to normal, disconnect the hose from the cylinder.
Lo Hi
Pressure
Gauge
Manifold Valve
Outdoor Unit
Indoor Unit
Charge Hose
Vacuum
Pump
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