Robinair 34788-H Recovery, Recycling, Recharging Unit - Manual (Page 17)

15
560826 Rev. D, August 23, 2013
System Flush
System Flushing Process
This unit provides a method of removing oil by forcing liquid refrigerant through an A/C
system, or components of an A/C system. A special flushing adapter, which is available as an
accessory, accesses the A/C system at the compressor block. After flushing, the refrigerant is
recovered by the unit and filtered by the recycling circuit, returning it to SAE purity levels.
A/C systems vary and may require the adapting and flushing of individual components. The
following procedure works with an orifice tube system. Refer to any service bulletins as needed
during this procedure.
Notes:
• The unit must have at least 10 lbs. of refrigerant available in the ISV (as indicated on the
display) for charging.
• If the flush process is interrupted by an accidental power-down or other fault, use the
Recover mode to remove the refrigerant from the vehicle.
Oil Drain
Bottle
Figure 11
Setup
1. Verify the oil drain bottle on the side of the unit
is empty. See Figure 11. Recover refrigerant as
outlined in this manual under Recover Refrigerant
from a Vehicle .
2. Close service coupler valves and disconnect hoses
from vehicle access ports.
3. Close the valve on the external source tank.
Note: During this procedure, up to 12 lbs. of
refrigerant is charged into the vehicle A/C system.
If the flushing cycle is stopped before it is complete
and the external source valve is open, the unit
automatically adds refrigerant to the ISV. There
will be no room to recover the refrigerant used for
flushing.
4. Remove the A/C system orifice tube, and reconnect
the fittings to create a bypass.
5. Disconnect the compressor block at the rear of the
compressor.
6. Attach the compressor block adapter (from the
flushing kit) to the system side of the compressor
block.
7. Configure the block connectors to provide forward-
or back-flushing of the refrigerant, which flows from
the unit through the red high-side connection hose.
Open the red service coupler.
8. Connect the filter housing to the desired return side
of the adapter block and to the blue low-side hose.
Open the blue service coupler.