Refrigeration System Diagnosis Guide - U-Line SP 18 Service Manual

Section 2 - Troubleshooting

REFRIGERATION SYSTEM DIAGNOSIS GUIDE

System Suction
Pressure
Condition
Normal Normal
Overcharge Higher than
normal
Undercharge Lower than
normal
Partial Somewhat
Restriction lower than
normal
vacuum
Complete In deep
Restriction vacuum
No Gas 0 PSIG to 25"
2-2
Suction Compressor
Line Discharge
Slightly below Very hot
room
temperature
Very cold may Slightly warm
frost heavily to hot
Warm-near Hot
room
temperature
Warm - near Very hot
room
temperature
Room Room
temperature temperature
(cool) (cool)
Room Cool to hot
temperature
(cool)
Condenser Capillary
Tube
Very hot Warm
Hot to warm Cool
Warm Warm
Top passes Room
warm - Lower temperature
passes cool (cool) or
(near room colder
temperature)
due to liquid
Room Room
temperature temperature
(cool) (cool)
Room Room
temperature temperature
(cool) (cool)
Evaporator Wattage
Cold Normal
Cold Higher than
normal
Extremely Lower than
cold near normal
inlet - Outlet
below room
temperature
Extremely Lower than
cold near normal
inlet - Outlet
below room
temperature
backing up
No Lower than
refrigeration normal
No Lower than
refrigeration normal