MAHLE RTI RRC770A - Manual (Page 10)

Page 7
... NOTE ...
Several audible changes may be heard during the recovery and recycling
process.
Refrigerant flow through check valves causes a “sizzle-type" sound.
These changing "noises" are normal and nothing to be concerned about.
5. Turn Main Power Switch to RECYCLE.
The Ready Light and Compressor-On light will illuminate. The Compressor and
Condenser Fan will be heard operating as refrigerant is recovered from the A/C
System.
The RRC770 will recover refrigerant from the A/C System until a vacuum is sensed.
The Compressor will turn off and the Compressor-On Light will turn off.
DO NOT TURN THE RRC770 OFF OR DISCONNECT HOSES
A small quantity of Liquid refrigerant will probably still remain in the A/C System. This liquid
will vaporize (boil up) and increase the pressure in the system as the components again
warm to ambient temperature. This can be detected by observing an increasing pressure
reading on the Low Side Gauge.
If pressure increases to a preset level, the RRC770 will again start to recover refrigerant.
The Compressor will turn on and the Compressor-On Light will illuminate.
Allow this sequence to repeat until the Compressor-On Light remains off continuously for
at least 2 minutes.
6. Close Red and Blue Hose Valves.
7. Close High and Low Gauge Valves.
8. Turn Main Power Switch to OFF.
CYLINDER FULL LIGHT: The Cylinder Full Light will illuminate if the Internal or External
Cylinder has been filled to capacity.