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DISCHARGING, EVACUATING, CHARGING AND CHECKING — Discharging (Cont'd) / Refrigerant Recycling

HA-17prose procedure
Continued from HA-16

Discharging (Cont'd)

Refrigerant recovery (continued)

  1. 6
    To drain A/C system oil accumulator, open "Accumulator Pressurizing" valve for approximately 15 seconds to allow some compressor discharge pressure back into accumulator. Close "Accumulator Pressurizing" valve and open "Oil Drain" valve slowly and drain accumulator. Do not allow accumulator to completely depressurize. When oil stops draining, close "Oil Drain" valve. Be sure to replace oil in A/C system before servicing.
    Front view of the refrigerant recycling unit / recovery tank on a wheeled cart, with callouts to the air purge valve, oil drain valve, accumulator pressurizing valve, tank, and oil bottle.
    SHA892C
  2. 7
    Turn off "Recovery" switch.
  3. 8
    When recovery tank is full, trip switch at the bottom of weight platform will de-energize compressor and "Tank Full" light will come on. Recycle refrigerant in tank before removing.

REFRIGERANT RECYCLING

For maximum efficiency, full tanks of recovered refrigerant should be recycled. As required, tanks containing a minimum of 3.6 kg (8 lb) of refrigerant can be recycled.

Refrigerant recycling

  1. 1
    Make certain both valves on recovery tank are open.
    Top view of refrigerant tank showing yellow air-purge line, blue liquid line, and red gas line connection points.
    SHA891C
  2. 2
    Turn on "Recycling" switch. Recycling solenoid will be energized.
  3. 3
    Depress start switch. Compressor will start, and "Recycling On" light will come. Refrigerant will be seen going through moisture indicator at start up. The sight glass will not completely fill with refrigerant.
    Circular moisture indicator window on the recycling unit, with concentric rings and a centre dot labelled 'Moisture indicator'.
    SHA895C
  4. 4
    Allow the station to operate until moisture indicator turns green. If moisture indicator does not turn green after 40 minutes, remove and replace filter.
  5. 5
    After recycling for approximately 5 minutes, check air purge indicator. If green pointer on air purge indicator leads red pointer by more than 10 psi (2 small divisions), bleed tank through air purge valve on the back of unit until both pointers are equal. Repeat as necessary.
    Air-purge indicator gauge with red needle and green needle around a circular scale (0-300), used to compare tank purge pressure.
    SHA896C
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