Accumulator HVAC: Description and Operation

The suction accumulator/drier is mounted on the right side of the bulkhead. The inlet tube of the suction accumulator/drier attaches directly to the evaporator core outlet tube.

Refrigerant enters the suction accumulator/drier and the heavier, oil-laden refrigerant falls to the bottom of the suction accumulator/drier. A small oil bleed hole is located in the side of the outlet tube near the bottom of the suction accumulator/drier. The bleed hole is covered with a filter and allows a small amount of the heavier liquid refrigerant and oil mixture to enter the A/C manifold and tube at a controlled rate. When the heavier liquid refrigerant and oil mixture enters the A/C manifold and tube, it has a second opportunity to vaporize and circulate through the A/C compressor without causing damage.

A desiccant bag is mounted inside the suction accumulator/drier to absorb any moisture in the refrigerant system.

A fitting located on the top of the suction accumulator/drier is used to attach the A/C cycling switch. A Schrader-type valve stem prevents refrigerant loss when the A/C cycling switch is removed.

CAUTION: Replace the suction accumulator/drier when:
^ It is restricted or perforated.
^ The refrigerant system has been left open for more than four hours or completely discharged for 24 hours or more.
^ There is evidence of water in the system. For example, internal corrosion of metal lines or dark, thick refrigerant oil.
^ A component such as an A/C evaporator core, A/C compressor, A/C condenser core, or refrigerant line is replaced.