INSTALLATION (CONTINUED)
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 evac- uation 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 | If tubing length is longer than |
33 ft. (10 m) | 33 ft. (10 m) |
|
|
10 min. or more | 15 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
2.Turn the wide tube service valve stem
Indoor Unit
Outdoor Unit
Manifold 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.
Pressure Gauge
Lo 
Hi
Charge Hose
Vacuum
Pump
14