System
Condition
Suction
Pressure
Suction
Line
Compressor
Discharge
Condenser Capillary
Tube
Evaporator Wattage
Normal Normal Slightly below
ro
om
temperature
Ver y h o t Ver y hot Warm Cold Normal
Overcharge Higher than
no
rmal
Ver y co l d -
may frost heavily
Slightly warm to
hot
Hot to warm Cool Cold Higher than
normal
Undercharge Lower than
no
rmal
Warm -
near room
temperature
Hot Warm Warm Extremely cold
near inlet - outlet
below room
temperature
Lower than
no
rmal
Partial
Rest
riction
Somewhat lower
than normal -
in vacuum
Warm -
near room
temperature
Ver y h o t Top passes warm
-
lower passes cool
(near room
temperature due
to liquid
Room
tem
perature
(cool) or colder
Extremely cold
near inlet -
outlet below
room
temperature
backing up
Lower than
no
rmal
Complete
Rest
riction
In deep
vacuum
Room
temperature
(cool)
Room
temperature
(cool)
Room
temperature
(cool)
Room
temperature
(cool)
No refrigeration Lower than
normal
No Gas 0 PSIG
to
25"
Room
temperature
(cool)
Cool to hot Room
temperature
(cool)
Room
temperature
(cool)
No refrigeration Lower than
normal
19 U-Line Service
Troubleshooting
Refrigeration System Diagnosis Guide