Expansion Valve: Testing and Inspection

1. CHECK QUANTITY OF GAS DURING REFRIGERATION CYCLE
2. SET ON MANIFOLD GAUGE SET
3. RUN ENGINE
a. Run the engine at 1,500 rpm for at least 5 minutes.
b. Then check that the high pressure reading is 1.37-1.57 MPa (14-16 kg/sq.cm, 199-228 psi).

4. CHECK 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), check the receiver's IN and OUT sides for no temperature difference.