Drier or Accumulator

If you thought an accumulator was a betting term, read on! Often referred to interchangeably, the drier and accumulator play an important role in a mobile air-conditioning system, however, there are key differences you should be aware of.

Receiver Drier

Also known as a filter drier, this part is found in expansion valve systems and generally has two ports. A compact, usually cylindrical shaped canister sometimes featuring a sight glass to check refrigerant flow, the drier is located between the condenser and the expansion valve. Filled with desiccant, the drier temporarily stores liquid refrigerant before it reaches the expansion valve. By removing debris and moisture in the loop, the drier helps to prevent internal corrosion and damage to system components.

Accumulator

Found in orifice tube systems near the evaporator on the low-pressure side of the system, the accumulator’s bulky appearance and domed bottom help to differentiate it from a drier. The part typically features three ports, one for refrigerant from the evaporator, one for refrigerant going to the compressor, and sometimes a pressure switch port. Containing desiccant to absorb moisture and contaminant, the accumulator’s purpose is to prevent liquid refrigerant from entering the compressor and damaging it.

We recommend replacing your receiver drier or accumulator every 2 years or whenever the circuit has been opened, as both components have a finite capacity for absorption. It’s worth noting that failure to replace these parts when a new compressor is fitted will void any warranty protection so don’t get caught out.

 

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