Oil drain & air purge – MAHLE RTI RRC770 User Manual
Page 9
RTI Technologies, Inc.
8
September 28, 1999
Page 8
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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:
Note: RRC770 must be connected to power
source.
1. Press and hold the Purge Air switch
(below the Contamination Monitor
Gauge) for 5 seconds, and then release
it.
2. Slowly open the Oil Drain Valve (below
cylinder shelf on rear left side of
RRC770) to drain any oil which may have
been removed from the A/C system. A cup
is provided to collect the oil.
Unless the A/C System had previously
been overfilled, the RRC770 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 RRC770. This
chart is reproduced at the right.
If the pressure indicated on the
Contamination Monitor Gauge is greater
than that determined from the chart:
Press and hold the Purge Air Switch
until the Contamination Monitor Gauge
pressure goes down to the pressure
determined from the chart. Any Non-
condensable Gas will be vented through
the Oil Drain Valve at this time.
5. Close the Oil Drain Valve.
6. Press and hold the Purge Air switch for
5 seconds. This permits any residual Non-
condensable Gas to be recirculated for
reprocessing during the next recycle
procedure.