MAHLE RTI RRC750X - Manual (Page 6)

Refrigerant Technologies, Inc.
May 24, 1993 Page 5
NOTE: Several audible changes may be heard during the recovery process. The oil
re-circulation and non-condensable gas venting circuits will cycle
periodically.
Refrigerant flow through check valves causes a "sizzle-type" sound.
These changing "noises are normal and nothing to be concerned
about.
Connect one end of the 8 Ft. yellow hose to the Inlet Port of the RR750X. Connect the other end to
the center port of a Gauge Manifold. The hose can also be connected directly to the low side of the
vehicle A/C system. The Pressure Gauge on the RR750X can then be used to monitor pressure.
If using a Gauge Manifold, connect it to the A/C system as specified by the manufacturer of the
vehicle.
Open the Gauge Manifold Valves (Counter-clock-wise).
NOTE: It is recommended that the High and Low Gauge Manifold Hoses have shut-off devices
within 12 in. of the ends connected to the vehicle A/C system. This will permit the
recovery of refrigerant from the hoses.
The yellow Service Hose could be connected directly to the low side of the A/C System
and the RR750X Inlet Pressure Gauge used to monitor pressure.
Turn the Main Power Switch to On.
The Ready Light and Compressor-On light will illuminate. The Compressor High Pressure Light
will flash momentarily. The Compressor and Condenser Fan will be heard operating as refrigerant
is recovered from the vehicle.
The RR750X will recover refrigerant from the A/C system. The Compressor-On Light will then turn
off.
! ! ! ! DO NOT TURN THE RR750X OFF OR DISCONNECT HOSES ! ! ! !
A small quantity of Liquid refrigerant will probably remain in the A/C system of the vehicle. This
liquid will vaporize as the system components again warm to ambient temperature. This can be
detected by noticing an increase in pressure readings on the Gauge Manifold.