Oil drain & air purge – MAHLE RTI TC670V User Manual
Page 13
RTI Technologies, Inc.
February 5, 1996
Page 10
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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 turn the Purge Valve (To the
right of the Purge Chart) clockwise and hold until
the pressure reading on the Pressure Gauge above
this valve drops one small graduation mark
(approximately 10 PSIG).
2.
SLOWLY open the Oil Drain Valve (Lower left
side on back of TC670) 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 TC670 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
TC670. This chart is reproduced at the right.
If the pressure indicated on the gauge is greater than
that determined from the chart...
SLOWLY turn clockwise and hold open the
Purge Valve 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.
Turn the N/C Vent Valve clockwise and hold for
approximately 5 seconds. This permits any residual
Non-condensable Gas to be recirculated for
reprocessing during the next recycle procedure.