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2) High suction pressure and low head
pressure
Low superheat and low subcooling
3) High suction pressure and high head
pressure
Low superheat and high subcooling
4) High to normal suction pressure and high
head pressure
Low subcooling
5) High suction pressure and high head
pressure
Low superheat and low subcooling
6) High suction pressure and high head
pressure
High superheat
7) Low
suction
pressure
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
pressure
Normal
to
high
subcooling
10) Low
suction
pressure
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 and high head
pressure
High superheat and high subcooling
14) Low
suction pressure and high head
pressure
High superheat and high subcooling
15) low to normal suction pressure and high
head pressure
Normal
to
high
subcooling
and
low
head
and
low
head
superheat
and
and
low
head
and
normal
to
high
superheat
and
high
- 23 -
2) Expansion valve opened,
too much oil
3) Overcharge
4) Non-condensable gas
5) Air
restricted,
condenser, bad condenser
fans
6) High
cellar
high evaporator load
7) Undercharge
8) Liquid line restricted after
receiver,
restricted
9) Suction line restricted
low
10) Air restricted at evaporator,
evaporator iced
11) Evaporator restricted
12) Expansion valve restricted
13) Both
evaporator
condenser restricted; liquid
and suction lines connected
wrong
14) Liquid line restricted before
receiver
15) Condenser restricted
dirty
temperature,
solenoid
valve
and
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