Trouble Shooting - Trane Oxbox 14 Seer Series Installation Instructions Manual

11.0 TROUBLE SHOOTING

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.
Table 11-1 Trouble shooting chart
SYMPTOM
Power off or loose electrical connection
Thermostat out of calibration-set too high
Failed contactor
Unit will not run
Blown fuses
Transformer defective
Interconnecting low voltage wiring damaged
Run or start capacitor failed (single phase only)
Loose connection
Condenser fan runs,
Compressor stuck, grounded or open motor
compressor doesn't
winding open internal overload
Low voltage condition
Improperly sized unit
Improper airflow
Incorrect refrigerant charge
Insufficient cooling
Air, non-condensible or moisture in system
Incorrect voltage
Incorrect voltage
Compressor short cycles
Defective overload protector
Refrigerant undercharge
installation & owner's manual
30
POSSIBLE CAUSE REMEDY
Check for correct voltage at compressor contactor in control box
Reset
Check for 24 volts at contactor coil - replace if contacts are
open
Replace fuses
Check wiring - replace transformer
Replace thermostat wiring
Replace
Check for correct voltage at compressor - check & tighten all
connection
Wait at least 2 hours for overload to reset. If still open, replace
the compressor.
Determine cause and correct. At compressor terminals,
voltages must be within 10% of rating plate volts when unit is
operating.
Recalculate load
Check - should be approximately 400 CFM per ton.
Charge per procedure attached to unit service panel.
Recover refrigerant, evacuate & recharge, add filter drier
Determine cause and correct. At compressor terminals,
voltages must be within 10% of rating plate volts when unit is
operating.
At compressor terminals, voltage must be ±10% or nameplate
marking when unit is operating.
Replace - check for correct voltage
Add refrigerant