Service Analyzer Chart - Rheem PNL-*AZ Series Installation Instructions Manual

15.7 SERVICE ANALYZER CHARTS
COMPRESSOR OVERHEATING
SYMPTOMS
High superheat
Low voltage
High voltage
High head pressure
Short cycling of compressor
26
POSSIBLE CAUSE
Low charge
Faulty metering device
High internal load
Restriction in liquid line
Low head pressure
Suction or liquid line subjected
to high heat source
Loose wire connections
Dirty or pitted compressor
contactor contacts
Power company problem,
transformer
Undersized wire feeding unit
Power company problem
Overcharge
Dirty heat pump coil
Faulty or wrong size
heat pump fan motor
Faulty fan blade
or wrong rotation
Recirculation of air
Additional Heat Source
Non-condensibles
Equipment not matched
Faulty pressure control
Loose wiring
Thermostat
TEV
Capillary tube
CHECK/REMEDIES
Check system charge
Restricted cap tube, TEV (TXV)
Power element superheat
adjustment
Foreign matter stopping flow
Hot air (attic) entering return
Heat source on; mis-wired or
faulty control
Drier plugged
Line kinked
Low charge
Operating in low ambient
temperatures
Hot attic
Hot water line
Check wiring
Replace contactor
Have problem corrected before
diagnosis continues
Correct and complete diagnosis
Have problem corrected
Check system charge
Clean coil
Replace fan motor
Replace fan blade
Replace with correct rotation motor
Correct installation
Check for dryer vent near unit
Check for recirculation from
other equipment
Recover refrigerant, Evacuate and
recharge system
Correct mis-match
Replace pressure control
Check unit wiring
Located in supply air stream
Differential setting too close
Customer misuse
Internal foreign matter
Power element failure
Valve too small
Distributor tube/tubes restricted
Restricted with foreign matter
Kinked
I.D. reduced from previous
compressor failure