MAHLE RTI TC2670 - Manual (Page 16)

RTI Technologies, Inc.
September 30, 1999 Page 15 15
PROBLEMS & SOLUTIONS
On rare occasion the TC2670 may seem to be performing incorrectly. Experience has shown that varying
operating conditions can affect the performance characteristics of the TC2670. The temperature of the
vehicle A/C System will affect how the TC2670 performs.
Following are typical problems with explanations of the possible cause and solution.
PROBLEM: My TC2670 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 TC2670 will take longer to draw a vacuum. More cycles may be required to
completely recover the refrigerant.
PROBLEM: I put 5 lbs. of refrigerant into the TC2670 using the Recycle Mode. When I checked the
sight glass on the Charging Cylinder, there was less than 5 lbs. I lost Refrigerant. The
unit must leak.
SOLUTION: Due to temperature changes, some refrigerant may condense into liquid form and stay in
tubes and other components in the circuit preceding the Charging Cylinder. This is
normal and will explain why all refrigerant is not visible in the sight glass.
PROBLEM: I can not get the TC2670 to draw a vacuum as indicated on the Low Side Gauge.
SOLUTION: Check Hoses for restrictions.
PROBLEM: When I try to fill the Charging Cylinder from an auxiliary cylinder of clean refrigerant, the
TC2670 is really slow or shuts down.
SOLUTION: The auxiliary cylinder will cool due to the vaporization of refrigerant. This causes the
pressure to decrease.
Use a heat belt to increase the speed of recycling by the TC2670.