Service Analyzer Charts
COMPRESSOR OVERHEATING
SYMPTOM POSSIBLE CAUSE #(%#+2%-%$9
High superheat
(greater than 15°F
[-] at coil
Low charge Check system charge.
Verify suction thermister operation Replace thermistor
Verify pressure transducer operation input
and output voltage
Replace transducer and/or harness and/or control board
Faulty metering device (EEV)
oreign matter stopping ow. lean inside with
nitrogen.
High internal load Hot air (attic) entering return
eat source on miswired or faulty control
Restriction in liquid line Drier plugged.
Line kinked.
Low head pressure Low charge
Operating in low ambient temperatures
Suction or liquid line subjected to high heat
source
Hot attic / insulate liquid line
Hot water line
Low line voltage Loose wire connections Check wiring.
Power company problem, transformer Have problem corrected before diagnosis continues.
Undersized wire feeding unit Correct and complete diagnosis.
High line voltage Power company problem Have problem corrected.
High head
pressure
Overcharge Check system charge.
Dirty outdoor coil Clean coil.
Faulty or wrong size outdoor fan motor Replace fan motor.
Faulty fan blade or wrong rotation Replace fan blade.
Replace with correct rotation motor.
Recirculation of air Correct installation.
Additional heat source Check for dryer vent near unit.
Check for recirculation from other equipment.
Noncondensibles Recover refrigerant. Evacuate and recharge system.
Equipment not matched Correct mismatch.
Short cycling of com-
pressor
Faulty pressure control Replace pressure control.
Loose wiring Check unit wiring.
Thermostat Located in supply air stream
Dierential setting too close
Customer misuse
EEV Internal foreign matter. Clean with nitrogen
Pressure transducer failure
Suction thermistor failure
EEV control failure
EEV coil failure
Distributor tube/tubes restricted
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