Expansion Valve: Testing and Inspection

Expansion Valve

INSPECT EXPANSION VALVE
a. Check the quantity of gas during refrigeration cycle.
b. Set on the manifold gauge set.

c. Run the engine.
1. Run the engine at 1,500 rpm for at least 5 minutes.
2. Then check that the high pressure reading is 1.37 -1.57 MPa (14-16 kg/sq.cm, 199-228 psi).

d. Check the expansion valve.
If the expansion valve is faulty, the low pressure reading will drop to 0 kPa (0 kg/sq.cm, 0 psi).

HINT: When the low pressure drops to 0 kPa (0 kg/sq.cm, 0 psi), feel the receiver's IN and OUT sides for zero temperaturedifference.