Leak Testing; How To Save Refrigerant - Compu-aire System 2100 Series Installation And Operation Manual

3) Start the compressors check the level in the sight glass. If the level has lowered, add additional Freon
to maintain the sight clear. After charging is complete, reset the high pressure switch.
Approximate charge required per circuit:
As recommended by ASHRAE MANUAL.
Total Charge = Basic Charge + Liquid Line Based on Hermetic and scroll Compressor Line and
Refrigerated Liquid at 100F

7.1.4 Leak Testing

No installation is complete until the entire system has been thoroughly checked for leaks. This
includes water tubing, humidifier make-up water, and condensate lines (if provided)

7.2 HOW TO SAVE REFRIGERANT

The process of opening a refrigerant circuit of the Maxi Kool and saving the refrigerant charge of the
system to be opened requires only a few more minutes than does blowing the refrigerant charge.
Intentionally blowing the charge is illegal.
The procedure for saving the refrigerant charge is as follows:
1) Open disconnect switch.`
2) Pull fuses on system not to be opened.
3) Install manifold on the receiver at each rotalock valve, using the high pressure gauge and the
charging hose.
4) Purge the hoses to remove any condensables.
5) Start the unit and set the thermostat at 40 degrees F; this will start the compressor.
6) Return to the receivers.
7) Backseat the rotalock valves on the system being pumped down. Open gauge and rotalock valve on
the other system.
8) During this procedure, watch the gauge pressure to prevent the receiver from over-filling. If the
gauge pressure starts to rise, do not let the pressure exceed setting on pressure relief device located on
the receiver.
9) Open the rotalock valve of the system, release vapor pressure present and make necessary repairs.
10) Evacuate the system. After evacuation is complete, the liquid can be transferred back into the
proper system, through the manifold gauge.
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