User Manual

RTI Technologies, Inc.
Page 9
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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 top of the Purge
Switch 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 (on lower right
side 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
and measure 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 Switch until
the gauge pressure approximately 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 Switch and hold for approximately
5 seconds. This permits any residual Non-
condensable Gas to be recirculated for reprocessing
during the next recycle procedure.