Liquid Charge; Vapor Charge - Compu-aire System 2100 Series Installation And Operation Manual

2) Remove all fuses including main fan and transformer fuses.
3) Connect the external transformer to the solenoid valves.
4) Evacuate the system in accordance with the following procedure:
Connect the refrigeration gauges on circuits #1 & #2 at both the suction and discharge
service valves.
Start with circuit #1 and open all service valves. Place in circuit #1, 150 psig of DRY
NITROGEN with a tracer of Freon for the purpose of leak checking. With pressure in circuit
#1, open the discharge and suction valve on compressor #2. If pressure increases in #2, the
system is cross circuited and must be re-checked for proper piping. If there is no pressure
increase, place 150 psig of DRY NITROGEN with a tracer of Freon in circuit #2 and leak test.
After completion of leak testing, release test pressure & pull a vacuum on the system. Leave this
pulled down for approximately 4 hours and re-check the gauge reading. If it has not changed purge
with Freon, pull another vacuum of 250 microns, leave on for 2 hours and re-check the gauge
readings. Purge with Freon and re-pull the vacuum of 250 microns (9.842 in. hg.) or less. After the
completion of this step, fill the system with Freon vapor until pressures have equalized in the liquid
and discharge lines.

7.1.2 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 rotalock adapter.
3) Purge the refrigerant hoses so that no non-condensable will enter the systems.
4) Open the refrigerant drum so that the liquid will flow from the drum to receiver.
5) Open the rotalock valve and allow the refrigerant to flow into the receiver.
6) Close the rotalock valve and disconnect gauges.
7) Start the compressor.

7.1.3 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.
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