MAHLE RTI AC800 - Manual (Page 16)

RTI Technologies, Inc.
October 6, 1999 Page 15
PROBLEMS & SOLUTIONS
On rare occasion the AC800 may seem to be performing incorrectly. Experience has shown that
varying operating conditions can affect the performance characteristics of the AC800. The
temperature of the vehicle A/C System will affect how the AC800 performs.
Following are typical problems with explanations of the possible cause and solution.
PROBLEM: My AC800 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 AC800 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 AC800 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 AC800 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 AC800 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 AC800.