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