CPS AR2700A Manuel d'utilisation - Page 13

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Recycling Maintenance - NCG Purge Procedure

It will be necessary to purge the recovery tank of non-condensable gases (NCG's). The

NCG's are picked up from leaks in a/c systems when performing the Recovery

Function. The best time to check for purging is first thing in the morning before using

the unit or 30 minutes after the last Recovery operation. The following is a step by step

of the air purge procedure:

1. Read the tank temperature via the provided

magnetic thermometer.

2. Read the pressure on the purge valve

assembly mount on the tank.

3. Use the NCG's purge table below to

determine if the refrigerant in the

recovery tank needs to be

purged of NCG's. See Examples 1 and 2.

4. If purging is required:

A. Open the purge valve for 15 seconds to vent the

NCG's. Then close valve.

B. Read purge gauge to see if the pressure of the

tank falls below the NCG Gases purge table.

If no, repeat step 4A

Example 1

R-134 Tank Temperature = 76 F

R-134 Tank Pressure = 86 psig

Maximum Pressure (from Table)= 90.3 psig

No NCG purging required.

Example 2

R-134 Tank Temperature = 88 F

R-134 Tank Pressure = 120 psig

Maximum Pressure (from Table)= 110.7 psig

Purge NCG's until Tank Pressure is

below 110.7 psig.

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