MAHLE RTI TX600 - Manual (Page 15)

RTI Technologies, Inc.
November 19, 1999 Page 14
PROBLEMS & SOLUTIONS
On rare occasion the TX600 may seem to be performing differently or not at all. Experience has
shown that varying operating conditions can affect the performance characteristics of the TX600.
The temperature of the vehicle A/C System will affect how the TX600 performs.
Following are typical problems with explanations of the possible cause and solution.
PROBLEM: My TX600 was recovering refrigerant and the Compressor On light went OFF
which indicates the A/C System should be in a vacuum. However, the Manifold
Gauge still shows a pressure.
SOLUTION Determine if the Condenser Cooling Fan is still running. The fan can be heard and
air flow through the TX600 can be felt. If the fan is running, the high pressure
switch has shut the TX600 off due to an over-pressure condition.
Turn the Power Switch OFF and then ON. The condition may correct itself.
This over-pressure will typically be due to excessive pressure in the External
Cylinder caused by Non-condensable Gas (Air). Refer to the "Oil Drain & Rapid
Air Purge Procedure" Section of this manual and follow the instructions to vent the
Non-condensable gas.
PROBLEM: My TX600 worked fine all last Summer. I got it out today for the first service job
this Spring and it is very slow in evacuating the system.
SOLUTION: Today's Spring temperature may be much lower than the average temperatures
during the summer months. Maybe the vehicle was brought in from outside where
the temperature is very low.
The refrigerant in the vehicle will not be under as high a pressure at lower
temperatures and the TX600 will take longer to draw a vacuum. More cycles may
be required to completely recover the refrigerant.
PROBLEM: I can not get the TX600 to draw a vacuum as indicated on the Low Side Manifold
Gauge.
SOLUTION: Check Manifold Gauge and Hoses for restrictions.