Liquid Charge; Vapor Charge - Compu-aire SYSTEM 2100 Installation, Operation And Maintenance Manual

Add refrigerant vapor to the suction side of the compressor to eliminate short cycling of
the compressor. The low pressure switch can be manually energized to expedite the
charging.
As the system builds head pressure, the condenser fan will start rotating slowly. The Fan
Speed Control motor will not be energized until a sufficient head pressure has been
developed during the charging of the unit.
Charge the unit until the sight glasses on the liquid lines in the compressor section clear.
Watch the sight glasses for a period of 10 minutes to insure that no bubbles re-appear.

8.8 Liquid Charge

After the final vacuum has been pulled on the systems, liquid refrigerant may be
placed in the receivers. This is accomplished by the following procedure:
1) Make sure the unit is off and that the solenoids are closed.
2) Connect a set of manifold gauges to the refrigerant drum and to the receiver at the
rotolock adapter.
3) Purge the refrigerant hoses so that no non-condesables will enter the systems.
4) Open the refrigerant drum so that the liquid will flow from the drum to receiver.
5) Open the roto-lock valve and allow the refrigerant to flow into the receiver.
6) Close the roto lock valve and disconnect gauges.
7) Start the compressor.

8.9 Vapor Charge

1) After the dehydration procedures have been followed, replace the fuses in the condenser
fan compressors and transformer circuits.
2) Connect hose from drum to suction port of the compressor, purge hose so that no non-
condensables are in the hose.
Rev. 01
05/27/2016
Page 22 of 42
Compu-Aire