Accumulator HVAC: Description and Operation

Accumulator-Interior Parts:

DESCRIPTION

Connected to the evaporator outlet pipe, the sealed accumulator assembly acts as a refrigerant storing container receiving vapor and some liquid and refrigerant oil from the evaporator.

OPERATION

At the bottom of the accumulator is the desiccant which acts as a drying agent for moisture that may have entered the system. An oil bleed hole is also located near the bottom of the accumulator outlet pipe to provide an oil return path to the compressor.

A low-side pressure Schrader-type valve service fitting is located near the top of the accumulator. A similar Schrader-type fitting is provided for mounting the pressure cycling switch. It is not necessary to recover refrigerant from the A/C system to replace the switch. The accumulator is serviced only as a replacement assembly.