MAHLE RTI RRC750X - Manual (Page 7)

Refrigerant Technologies, Inc.
May 24, 1993 Page 6
If the pressure increases to a preset level, the RR750X 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 2 minutes.
Close the valves on the 8 Ft. hose and the Gauge Manifold.
Turn the Main Power Switch to OFF.
Slowly open the Oil Drain Valve on the back of the RR750X to drain any oil which may have been
removed from the A/C system. Use the cup provided to measure the amount of oil which was
removed during the recovery procedure. Refer to the A/C system manufacturer's manual for
recommendations concerning the need to add lubrication during the charging procedure.
Hoses can now be disconnected and the A/C system serviced.
CHARGING WITH THE RR750X
Refrigerant is recycled by the RR750X and stored in the External Cylinder. An Accessory Charging
Cylinder or Auxiliary Charging Tank with a Weighing Scale can be used to charge an A/C System
with this recycled refrigerant.
Refer to Figure 1 to determine which hose on the back of the RR750X is connected to the External
Cylinder “LIQUID” Valve.
Disconnect this hose from the External Cylinder and install the Liquid Line Tee Tap supplied with
the RR750X.
Connect one end of the Yellow Service Hose to the Tee. Make all connections finger tight only.
Refer to Figures 2 and 3 for connection configurations to transfer refrigerant from the RR750X
External Cylinder to a Charging Cylinder or Auxiliary Charging Tank.
Pressure in a Charging Cylinder or Auxiliary Charging Tank must be less than the pressure in the
RR750X External Cylinder. The RR750X can be used to create this pressure differential without
releasing refrigerant to the atmosphere as follows:
Connect the Yellow Service Hose from the Inlet Port of the RR750X to the Vapor Port of the
RR750X to the Vapor Port of a Charging Cylinder or Auxiliary Charging Tank.
Open ball valve on the Yellow Service Hose.
MOMENTARILY (10 to 15 Seconds) turn the RR750X Power Switch On.
Close ball valve and reconnect the Yellow Service Hose for transferring liquid from the RR750X
External Cylinder (Refer to Figures 2 and 3).