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f.
High suction pressure and high head pressure
High superheat
g. Low suction pressure and low head pressure
High superheat and low subcooling
h. Low suction pressure and low to normal head pressure
High superheat and high subcooling
i.
Low suction pressure and low head pressure
Normal to high superheat and low subcooling
j.
Low suction pressure and low head pressure
Low superheat and low subcooling
k. Low suction pressure and low to normal head pressure
High superheat and normal to high subcooling
l.
Low suction pressure and normal head pressure
High superheat and normal subcooling
m. Low suction pressure and high head pressure
High superheat and high subcooling
n. Low suction pressure and high head pressure
High superheat and high subcooling
o. low to normal suction pressure and high head pressure
Normal to high superheat and high subcooling
f. High room temperature, high
evaporator load
g. Undercharge
h. Liquid line restricted after
receiver, solenoid valve
restricted
i.
Suction line restricted
j. Air restricted at evaporator,
evaporator iced
k. Evaporator
restricted
l.
Expansion valve restricted
m. Both evaporator and condenser
restricted; liquid and suction
lines connected wrong
n. Liquid line restricted before
receiver
o. Condenser
restricted
10. Condensing Unit Troubleshooting
Unit not running
a. Incorrect power supply
b. Incorrect or loose wirings
c. Failed
components
d. Liquid refrigerant in the compressor
e. Low pressure switch shutting down the system
a. Check for proper voltage
b. Check all wirings and connections
c. Check start relay, start capacitor, overload
protector, compressor.
d. Call service for OEM information
e. Check for system restriction or low
refrigerant
