Robinair 34988 Recovery, Recycling, Recharging Unit - Manual (Page 19)

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554228 Rev. E July 30, 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 (purchased separately) 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.
Setup
1. Verify the oil drain bottle on the side of the unit
is empty. See Figure 8. 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,
and 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.
Oil Drain
Bottle
Figure 8