Accumulator HVAC: Description and Operation

Accumulator/Drier:

The suction accumulator/drier is mounted to the engine side of the dash panel on the RH side of the vehicle. The inlet tube of the suction accumulator/drier attaches directly to the A/C evaporator core outlet tube. Refrigerant enters the suction accumulator/drier from the A/C evaporator core through the inlet tube and the heavier, oil-laden refrigerant falls to the bottom of the suction accumulator/drier.

A small diameter oil bleed hole is located in the side of the outlet tube near the bottom of the suction accumulator/drier. This bleed hole is covered with a filter screen and allows a small amount of the heavier liquid refrigerant and oil mixture to re-enter the suction line at a controlled rate. When the heavier liquid refrigerant and oil mixture enters the A/C compressor suction line, it has a second opportunity to vaporize and circulate through the A/C system without causing damage to the A/C compressor due to refrigerant slugging. If it is necessary to check the suction accumulator/drier for excessive refrigerant oil, drill two holes in suction accumulator/drier to drain the oil into a calibrated container.

Two desiccant bags are mounted inside the suction accumulator/drier to absorb any moisture which may be in the refrigerant system.

A fitting located on the top of the suction accumulator/drier is used to attach the A/C cyclic switch. A long-travel Schrader-type valve stem core is installed in the fitting opening to prevent refrigerant loss when the A/C cyclic switch is removed.