MAHLE RTI RHS680 - Manual (Page 9)

Page 7
RECOVER (RECYCLE)
1. Turn Function Valve on RHS680 to RECOVER.
2. Open high and low valves on gauge manifold.
3. The display will show the weight of refrigerant in the
RHS680 cylinder and indicate the unit is recycling.
4. When the A/C system pressure is in a vacuum the
display will show RECYCLE COMPLETE CHECK
PRESSURES. Wait two minutes to see if the pressure
in the A/C increases (due to liquid refrigerant
vaporizing). The RHS680 will automatically begin
recycling again if the pressure rises above zero.
5. Press the stop key and close the high and low valves on
the gauge manifold.
6. Turn Function Valve on RHS680 to OFF.
Note:
The display will show CYLINDER FULL GO TO CHARGE
if the RHS680 cylinder fills to capacity. Press the STOP key
and perform a charge procedure to transfer refrigerant to
another A/C system or an external storage cylinder.
PURGE AIR - DRAIN OIL
1. The oil drain valve is accessible from the rear of the RHS680, located under the main enclosure
on the right side (when viewed from rear). Open the Purge Valve for 5 seconds and then close
it. Slowly open the oil drain valve and drain any oil into the measuring cup to determine how
much oil (if any) should be added to the A/C.
2. Leave the oil drain valve open.
3. Measure the room temperature.
4. Find the corresponding pressure for this temperature on the purge chart printed on the RHS680
top panel.
5. Compare this pressure from the chart with that indicated on the Purge Gauge. If the gauge
shows a higher pressure, slowly open the Purge Valve a small amount until the pressure drops
to approximately the pressure shown in the chart.
6. Turn the purge valve to OFF.
7. Close the oil drain valve.
IMPORTANT: Oil must be drained and Air purged after each recover (recycle) procedure.
Failure to do so will cause excess air to be introduced into the A/C during charge and the
RHS680 will fill with air causing a high-pressure shutdown.