Troubleshooting - Rheem Air Conditioners Installation Instructions Manual

WARNING
!
DISCONNECT ALL POWER TO UNIT BEFORE SERVICING. CONTACTOR MAY BREAK ONLY ONE SIDE. FAILURE
TO SHUT OFF POWER CAN CAUSE ELECTRICAL SHOCK RESULTING IN PERSONAL INJURY OR DEATH.
SYMPTOM
Unit will not run
Condenser fan runs, compressor
doesn't
Insufficient cooling
Compressor short cycles
Registers sweat
High head-low vapor pressures
High head-high or normal vapor
pressure - Cooling mode
High head-high or normal vapor
pressure - Heating mode
Low head-high vapor pressures
Low vapor - cool compressor -
iced evaporator coil
High vapor pressure
Fluctuating head & vapor
pressures
Gurgle or pulsing noise at
expansion device or liquid line
TROUBLE SHOOTING CHART
POSSIBLE CAUSE
• Power off or loose electrical connection
• Thermostat out of calibration-set too high
• Defective contactor
• Blown fuses
• Transformer defective
• High pressure control open (if provided)
• Interconnecting low voltage wiring damaged
• Run capacitor defective (single phase only)
• Loose connection
• Compressor stuck, grounded or open motor winding
open internal overload.
• Low voltage condition
• Improperly sized unit
• Improper airflow
• Incorrect refrigerant charge
• Air, non-condensibles or moisture in system
• Incorrect voltage
• Incorrect voltage
• Defective overload protector
• Refrigerant undercharge
• Low evaporator airflow
• Restriction in liquid line, expansion device or filter drier
• Flow check piston size too small
• Incorrect capillary tubes
• TXV does not open
• Dirty condenser coil
• Refrigerant overcharge
• Condenser fan not running
• Air or non-condensibles in system
• Low air flow - condenser coil
• Refrigerant overcharge
• Air or non-condensibles in system
• Dirty condenser coil
• Defective Compressor valves
• Low evaporator airflow
• Operating below 65°F outdoors
• Moisture in system
• TXV limiting refrigerant flow
• Excessive load
• Defective compressor
• TXV hunting
• Air or non-condensibles in system
• Air or non-condensibles in system
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
• Reset-also see high head pressure remedy-
• Replace thermostat wiring
• Replace
• Check for correct voltage at compressor -
check & tighten all connections
• Wait at least 2 hours for overload to reset.
If still open, replace the compressor.
At compressor terminals, voltage 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
• At compressor terminals, voltage must be within 10% of rating
plate volts when unit is operating.
• At compressor terminals, voltage must be ± 10% of
nameplate marking when unit is operating.
• Replace - check for correct voltage
• Add refrigerant
• Increase speed of blower or reduce restriction - replace air
filter
• Remove or replace defective component
• Change to correct size piston
• Change coil assembly
• Replace TXV
• Clean coil
• Correct system charge
• Repair or replace
• Recover refrigerant, evacuate & recharge
• Check filters - correct to speed
• Correct system charge
• Recover refrigerant, evacuate & recharge
• Check filter - clean coil
• Replace compressor
• Increase speed of blower or reduce restriction - replace air
filter
• Add Low Ambient Kit
• Recover refrigerant - evacuate & recharge - add filter drier
• Replace TXV
• Recheck load calculation
• Replace
• Check TXV bulb clamp - check air distribution on coil - replace
TXV
• Recover refrigerant, evacuate & recharge
• Recover refrigerant, evacuate & recharge
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