Accumulator HVAC: Description and Operation

Connected to the evaporator outlet pipe, the sealed accumulator acts as a refrigerant storage container receiving vapor and some liquid and refrigerant oil from the evaporator. At the bottom of the accumulator is the desiccant which acts as a drying agent for moisture that may be trapped in 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. The accumulator is serviced only as a replacement.