MAHLE RTI RRC750X - Manual (Page 10)

Refrigerant Technologies, Inc.
May 24, 1993 Page 9
HOW THE RR750X RECOVERS & RECYCLES REFRIGERANT
Following is a description of the purpose and performance characteristics of the components within
the RR750X. The items are discussed in the order as seen by refrigerant as it flows through the unit
from the Inlet Port to the External Cylinder.
Refer to the Flow Diagram and Circuit Diagram in the Appendix.
INLET PRESSURE GAUGE
Indicates pressure of refrigerant at the Inlet Port of the RR750X.
CHECK VALVE
Prevents escape of refrigerant to the atmosphere.
SUCTION ACCUMULATOR
This device may be designated by several different names, the most common being:
! SUCTION ACCUMULATOR
! SUCTION RECEIVER
! SUCTION OIL SEPARATOR
Vapor and/or saturated liquid refrigerant from the vehicle A/C system enters the Suction
Accumulator through the Inlet Port.
Refrigerant still in the liquid state will vaporize in the Suction Accumulator due to the increase in
volume.
As the refrigerant changes direction of travel while flowing through the Suction Accumulator, oil
droplets (with greater mass than the refrigerant vapor) are slung towards the container walls where
they collect and migrate to the bottom.
This oil is removed from the Suction Accumulator through the Oil Drain Valve and measured after
each recovery cycle to determine the need to add oil to the A/C system.
The Low Pressure Switch mounted on the Suction Accumulator opens when a vacuum of 8 ± 2 In.
Hg. is detected. This stops the recovery process. This switch closes again when a pressure greater
than 3 ± 3 PSIG is reached.
ACID FILTER
Refrigerant enters the Acid Filter through a port on the top and travels through a solid desiccant core
where organic and volatile contaminates are filtered, moisture is absorbed, and acid is removed. The
refrigerant travels from the outside to the inside of the desiccant core and then out through the
bottom port.