Double Deck J4PG4 Installation Manual

11.0 TROUBLE SHOOTING
Table 11-1 Trouble shooting chart
WARNING
Components trouble shooting requires opening control box with
power on. Use extreme care while working on this condition.
Check nameplate and this instruction when making wire
connections.
SYMPTOM POSSIBLE CAUSE REMEDY
Power off or loose electrical connection Check for correct voltage at compressor contactor in control box
Thermostat out of calibration-set too high Reset
Failed contactor
Check for 24 volts at contactor coil - replace if contacts are
open
Blown fuses Replace fuses
Transformer defective Check wiring - replace transformer
Interconnecting low voltage wiring damaged Replace thermostat wiring
Run or start capacitor failed (single phase only) Replace
Loose connection
Check for correct voltage at compressor - check & tighten all
connection
Compressor stuck, grounded or open motor
winding open internal overload
Wait at least 2 hours for overload to reset. If still open, replace
the compressor.
Low voltage condition
Determine cause and correct. At compressor terminals,
voltages must be within 10% of rating plate volts when unit is
operating.
Improperly sized unit Recalculate load
Improper airflow Check - should be approximately 400 CFM per ton.
Incorrect refrigerant charge Charge per procedure attached to unit service panel.
Air, non-condensible or moisture in system Recover refrigerant, evacuate & recharge, add filter drier
Incorrect voltage
Determine cause and correct. At compressor terminals,
voltages must be within 10% of rating plate volts when unit is
operating.
Incorrect voltage
At compressor terminals, voltage must be ±10% or nameplate
marking when unit is operating.
Defective overload protector Replace - check for correct voltage
Refrigerant undercharge Add refrigerant
Unit will not run
Condenser fan runs,
compressor doesn't
Insufficient cooling
Compressor short cycles
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