Expansion Valve: Testing and Inspection

1. CHECK QUANTITY OF GAS DURING REFRIGERATION CYCLE
2. SET ON MANIFOLD GAUGE SET
Service and Repair

3. RN ENGINE
Run the engine at 1,500 rpm for at least 5 minutes.
Then check that the high pressure reading is 1.37-1.53 MPa (14 - 16 kgf/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 kgf/Sq.cm, 0 psi),otherwise it is ok.

HINT: When the low pressure drops to 0 kPa (0 kgf/Sq.cm, 0 psi), check the receivers IN and OUT side for no temperature difference.