Expansion Block/Orifice Tube: Description and Operation

Expansion (Orifice) Tube:

DESCRIPTION

The plastic expansion tube, with its mesh screen and orifice, is located in the evaporator inlet line midway between the condenser and evaporator, at a dual 0-ring joint. It provides a restriction to the high pressure liquid refrigerant in the liquid line, metering the flow of refrigerant to the evaporator as a low pressure liquid.

OPERATION

The expansion tube and orifice are protected from contamination by filter screens on both inlet and outlet sides.

The tube is serviced only as a replacement assembly.