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pressure
High superheat
7) Low
suction
pressure
High superheat and low subcooling
8) Low suction pressure and low to normal head
pressure
High superheat and high subcooling
9) Low
suction
pressure
Normal
subcooling
10) Low
suction
pressure
Low superheat and low subcooling
11) Low suction pressure and low to normal head
pressure
High
superheat
subcooling
12) Low suction pressure and normal head
pressure
High superheat and normal subcooling 13)Low
suction
pressure
High superheat and high subcooling
Low
14)
pressure
High superheat and high subcooling
low to normal suction pressure and high head
15)
pressure
Normal
subcooling
10. Condensing Unit Troubleshooting
Unit not running
1) Incorrect power supply
2) Incorrect or loose wirings
3) Failed components
4) Low pressure switch shutting down the
system
5) high pressure switch shutting down
the system
pressure
and
pressure
and
to
high
superheat
pressure
and
and
normal
pressure and high head
suction pressure and high head
to
high
superheat
low
head
7) Undercharge
8) Liquid
low
head
9) Suction line restricted
and
low
low
head
10) Air restricted at evaporator,
to
high
12) Expansion valve restricted
13) Both evaporator and condenser
14) Liquid line restricted before
15) Condenser restricted
and
high
1) Check for proper voltage
2) Check
connections
3) Check start relay, start capacitor, overload
protector, compressor.
4) Check for system restriction or low
refrigerant
5) Check for the condenser fan
-25-
high evaporator load
line
restricted
receiver,
solenoid
restricted
evaporator iced
11) Evaporator restricted
restricted; liquid and suction
lines connected wrong
receiver
all
wirings
after
valve
and
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