(1) Pumping down
Indoor unit | Liquid side |
|
Open | Outdoor unit |
Gas side
Closed
Lo
CLOSECLOSE
Purge the air
•Procedure
For pumping down,firstly short the Low Pressure s/w at the outside and then operate below proce- dure.
1.Confirm that both the gas side and liquid side valves are set to the open position.
-Remove the valve stem caps and confirm that the valve stems are in the raised position.
-Be sure to use a hexagonal wrench to operate the valve stems.
2.Operate the unit for 10 to 15 minutes.
3.Stop operation and wait for 3 minutes, then con- nect the manifold gauge to the service port of the gas side valve.
-Connect the hose of the gauge with the push pin to the service port.
4.Air purging of the charge hose.
-Open the
5.Set the liquid side valve to the closed position.
6.Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg/cm2g.
7.Immediately set the gas side valve to the closed position.
-Do this quickly so that the gauge ends up indi- cating 1kg/
g (14 psig).
8.Disconnect the charge set, and mount the liquid side and gas side valve caps and the service port nut.
-Use torque wrench to tighten the service port nut to a torque of 1.8kg.m.(13
-Be sure to check for gas leakage.
• Be sure to short pressure S/W. otherwise Low pressure S/W detect low pressure skete and stops the compressor.
48Ceiling Cassette Air Conditioner
