13pjl manual

16.6 GENERAL TROUBLE SHOOTING CHART

!

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

POSSIBLE CAUSE

• Power off or loose electrical connection

• Thermostat out of calibration-set too high

• Defective contactor

• Blown fuses / tripped breaker

• Transformer defective

• High pressure control open (if provided)

Outdoor fan runs, compressor • Run or start capacitor defective doesn’t • Start relay defective

• Loose connection

Insufficient cooling

Compressor short cycles

Registers sweat

• Compressor stuck, grounded or open motor winding, open internal overload.

• Low voltage condition

• Improperly sized unit

• Improper indoor airflow

• Incorrect refrigerant charge

• Air, non-condensibles or moisture in system

• Incorrect voltage

• Defective overload protector

• Refrigerant undercharge

• Low indoor airflow

High head-low vapor pressures • Restriction in liquid line, expansion device or filter drier

• Flowcheck piston size too small

• Incorrect capillary tubes

High head-high or normal vapor • Dirty outdoor coil pressure - Cooling mode • Refrigerant overcharge

• Outdoor fan not running

• Air or non-condensibles in system

Low head-high vapor pressures • Flowcheck piston size too large

• Defective Compressor valves

• Incorrect capillary tubes

Low vapor - cool compressor • Low indoor airflow iced indoor coil

• Operating below 65°F [18.3°C] outdoors

• Moisture in system

High vapor pressure

Fluctuating head & vapor pressures

• Excessive load

• Defective compressor

• TEV hunting

• Air or non-condensibles in system

Gurgle or pulsing noise at expansion device or liquid line

• Air or non-condensibles in system

REMEDY

• Check for correct voltage at contactor in condensing unit

• Reset

• Check for 24 volts at contactor coil - replace if contacts are open

• Replace fuses / reset breaker

• Check wiring-replace transformer

• Reset-also see high head pressure remedy-The high pressure control opens at 450 PSIG [3102 kPa]

• Replace

• 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.

• Add start kit components

• Recalculate load

• Check - should be approximately 400 CFM [188.8 L/s] per ton.

• Charge per procedure attached to unit service panel

• Recover refrigerant, evacuate & recharge, add filter drier

• 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

• Clean coil

• Correct system charge

• Repair or replace

• Recover refrigerant, evacuate & recharge

• Change to correct size piston

• Replace compressor

• Replace coil assembly

• Increase speed of blower or reduce restriction - replace air filter

• Add Low Ambient Kit

• Recover refrigerant - evacuate & recharge - add filter drier

• Recheck load calculation

• Replace

• Check TEV bulb clamp - check air distribution on coil - replace

TEV

• Recover refrigerant, evacuate & recharge

• Recover refrigerant, evacuate & recharge

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