Owner manual

RTI Technologies, Inc.
September 19, 1997 Page 9
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F R12 R134a
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Purge Chart
OIL DRAIN & AIR PURGE
Oil and Non-condensable Gas (Air) are separated from
the recovered refrigerant and MUST be removed
following EACH recycling procedure as follows:
1. MOMENTARILY press the Purge Button (To the
right of the Purge Chart) and hold until the pressure
reading on the Pressure Gauge above this button
drops one small graduation mark (approximately 10
PSIG).
2. SLOWLY open the Oil Drain Valve (Lower left
side on back of TC670E) to vent Non-condensable
Gas and drain any oil which may have been
removed from the A/C System. A plastic cup is
provided to collect the oil.
Unless the A/C System had previously been
overfilled, the TC670E will typically not remove
more than a tablespoon of oil, making replenishment
unnecessary.
Leave the Oil Drain Valve open.
3. Determine the room temperature.
4. Locate the pressure (PSIG) corresponding to this
room temperature (
0
F) in the chart on the top of the
TC670E. This chart is reproduced at the right.
If the pressure indicated on the gauge is greater than
that determined from the chart...
SLOWLY press and hold the Purge Button until
the gauge pressure equals that shown in the chart.
Any Non-condensable Gas will be vented
through the Oil Drain Valve.
5. Close the Oil Drain Valve.
6. Press the Purge Button and hold for approximately
5 seconds. This permits any residual Non-
condensable Gas to be recirculated for reprocessing
during the next recycle procedure.