MAHLE RTI TC670V - Manual (Page 19)

RTI Technologies, Inc.
February 5, 1996 Page 16
PROBLEMS & SOLUTIONS
On rare occasion the TC670 may seem to be performing differently or not at all. Experience has
shown that varying operating conditions can affect the performance characteristics of the TC670.
The temperature of the vehicle A/C System will affect how the TC670 performs.
Following are typical problems with explanations of the possible cause and solution.
PROBLEM: My TC670 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 TC670 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 TC670 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 TC670 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 TC670 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 TC670.