Winnebago 1987-1989 LeSharo Service Manual page 619

DIAGNOSIS OF Ale SYSTEM
CONDITION 10
RESTRICTION IN HIGH SIDE
I
LOW SIDE LOW
LOW SIDE
HAND VALVE
CLOSED
LOW SIDE HOSE
CONNECTED TO
LOW SIDE SERVICE
CONNECTOR
Complaint
AMBIENT
TEMP. 95° F.
NOT USED
Ld
HIGH SIDE HIGH
Restriction At Expansion
Valve Or Receiver-Drier
Outlet Will Cause Low
High Side Reading!
HIGH SIDE HOSE
CONNECTED TO
HIGH SIDE SERVICE
CONNECTOR
Discharge
Cooling is not adequate
Condition
1. Low side gauge reading too low. Should be
15-30 psi.
2. High side gauge reading will build excessively
high. Should be 185-205 psi at an ambient
temperature of 95°F. See chart for pressures at
other ambient temperatures.
NOTE An overcharged system, or a Condenser
or Receiver-Drier that is too small, will
cause high side gauge reading to be
normal or excessively high.
3. Discharge air from evaporator only slightly
cool.
4. Liquid line cool to the touch; line or
Receiver-Drier may show heavy sweating or
frost.
Restriction in Receiver-Drier or liquid line with
compressor removing refrigerant from evaporator
faster than it can enter resulting in a "starved"
evaporator.
Correction
1. Discharge system.
2. Remove and replace Receiver-Drier, liquid
lines, or other defective parts.
3. Evacuate system using vacuum pump.
4. Charge system with NEW Refrigerant 12.
5. Operate system and check performance.
N4-13