Vacuum Restrictor HVAC: Service and Repair
Replace accumulator and restrictor whenever moisture or contamination (blockage) have entered refrigerant system.- Discharge A/C system.
- Remove A/C compressor and plug all refrigerant line connections.
- Remove compressor oil drain plug, drain old refrigerant oil from compressor and measure amount.
NOTE:
- Rotate compressor by hand to speed up oil draining process.
- Dispose of used refrigerant oil following laws governing hazardous waste disposal.
CAUTION:
In order to ensure lubrication during initial start-up, add a minimum of80 cc (2.7 oz) of fresh refrigerant (PAG) oil to A/C compressor.
- Refill compressor with 80 cc (2.7 oz) of fresh refrigerant oil.
- Install oil drain plug.
If total amount of refrigerant oil drained from old compressor was greater than 80 cc (2.7 oz):
- Subtract 80 cc (2.7 oz) (amount of new oil that was added to compressor) from total amount.
- Add resulting amount of fresh refrigerant oil to evaporator.
Example:
100 cc (amount of oil drained from old compressor)
-80 cc (amount of fresh oil added to new compressor)
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20 cc (amount of fresh oil to be added to evaporator or accumulator)
NOTE: Some refrigerant/recovery/recycling/recharging equipment has provisions for adding refrigerant (PAG) oil during system recharge. If using this method for adding oil, follow all refrigerant/recovery/recycling/recharging equipment manufacturer's instructions.
- Replace restrictor.
- Install A/C compressor.
- Remove accumulator and plug all open line connections.
- Blow through accumulator with compressed air and collect oil that runs out.
- Add same amount of new refrigerant (PAG) oil to new accumulator plus 30 cc (1.0 fl oz).
NOTE: Install new accumulator immediately after opening to prevent moisture contamination of desiccant.
- Install new accumulator.
- Evacuate and recharge A/C system.
- Manually rotate A/C compressor 10 rotations before operating system to prevent compressor damage.