Daewoo DSB-181LH Owner's Manual page 14

Evacuation
1. Attach the charge hose end described in the leak test
area to a vacuum pump to evacuate the tubing and
indoor unit. Confirm the "Lo" 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:
Required time for evacuation when 30 gal/h vacuum
pump is used
If tubing length is less than
33 ft. (10 m)
10 min. or more
2. When the desired vacuum is reached, close the "Lo" 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.
CAUTION:
To avoid gas from leaking when removing the charge hose,
make sure the wide tube service valve is fully open and
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..
INSTALLATION (CONTINUED)
If tubing length is longer than
33 ft. (10 m)
15 min. or more
Manifold Valve
Pressure
Lo
Gauge
13
Indoor Unit
Outdoor Unit
Hi
Charge Hose
Vacuum
Pump