Expansion Block/Orifice Tube: Description and Operation

EVAPORATOR CORE ORIFICE

Evaporator Core Orifice:

NOTE:
- The evaporator core orifice is an integral part of the condenser to evaporator line and should be installed as an assembly with the line.
- A new evaporator core orifice should be installed whenever a new A/C compressor is installed.

The evaporator core orifice has the following characteristics:
- It is located in the A/C condenser to evaporator line.
- It has filter screens located on the inlet and outlet ends of the tube body.
- The inlet filter screen acts as a strainer for the liquid refrigerant flowing through the evaporator core orifice.
- O-ring seals on the evaporator core orifice prevent the high-pressure liquid refrigerant from bypassing the evaporator core orifice.
- Adjustment or repair cannot be made to the evaporator core orifice assembly. A new evaporator core orifice must be installed as a unit.