MAHLE RTI RRC770 - Manual (Page 15)

RTI Technologies, Inc.
14 September 28, 1999 Page 14
PROBLEMS & SOLUTIONS
On rare occasion the RRC770 may seem to be performing incorrectly.
Experience has shown that varying operating conditions can affect the
performance characteristics of the RRC770. The temperature of the vehicle
A/C System will affect how the RRC770 performs.
Following are typical problems with explanations of the possible cause and
solution.
PROBLEM: My RRC770 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 RRC770 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 RRC770 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 RRC770 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 RRC770 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 RRC770.