System Inspection

This is a method in which the trouble is located by using a manifold gauge set.
Read the manifold gauge pressure when the following conditions are established:
(a) Temperature at the air inlet with the switch set at RECIRC is 30 - 35° C (86 - 95° F)
(b) Engine running at 1,500 rpm
(c) Blower speed control switch set at high
(d) Temperature control set at max. cool

HINT: It should be noted that the gauge indications may vary slightly due to ambient temperature conditions.





1. NORMALLY FUNCTIONING REFRIGERATION SYSTEM
Gauge reading:
Low pressure side:
0.15 - 0.25 MPa (1.5 - 2.5 kgf/sq.cm)
High pressure side:
1.37 - 1.57 MPa (14 - 16 kgf/sq.cm)





2. MOISTURE PRESENT IN REFRIGERATION SYSTEM





3. INSUFFICIENT REFRIGERANT





4 POOR CIRCULATION OF REFRIGERANT





5. REFRIGERANT DOES NOT CIRCULATE





6. REFRIGERANT OVERCHARGE OR INSUFFICIENT COOLING OF CONDENSER





7. AIR PRESENT IN REFRIGERATION SYSTEM





8. EXPANSION VALVE IMPROPERLY MOUNTED/HEAT SENSING TUBE DEFECTIVE (OPENS TOO WIDE)





9. DEFECTIVE COMPRESSION COMPRESSOR