Expansion Valve: Testing and Inspection

INSPECT EXPANSION VALVE
a. Check quantity of gas during refrigeration cycle.
b. Set on manifold gauge set.
c. Run 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 to 1.57 Mpa (14 to 16 kgf.sq.cm, 199 to 288 psi).

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

HINT: When the lower pressure drop to 0 kPa (0 kgf.sq.cm, 0 psi), feel the receiver's IN and OUT sides for no temperature difference.