Bryant 576b installation instructions Troubleshooting Guide, Symptom Cause Remedy

Page 13

TROUBLESHOOTING GUIDE

SYMPTOM

CAUSE

REMEDY

 

Compressor does not run —

Power off.

Restore power.

 

 

 

Contactor open

 

 

 

 

 

Fuses blown.

Replace with correct fuses after finding cause

 

and correcting.

 

 

 

 

 

 

 

 

 

Transformer open/shorted.

Replace transformer if primary windings are

 

receiving power and no output.

 

 

 

 

 

 

 

Thermostat circuit open.

Check thermostat setting.

 

 

 

 

Low-pressure switch open.

Check for refrigerant undercharge or system

 

leak.

 

 

 

 

 

 

 

 

 

High-pressure switch open.

Check for refrigerant over charge or

 

 

obstruction of outdoor airflow.

 

 

 

 

 

 

 

 

 

Connections loose.

Tighten all connections.

 

 

 

 

Compressor motor thermostat open.

Check for excessive motor temperature.

Compressor does not run —

Compressor leads loose, broken.

Check connections with power off.

 

Contactor closed

 

 

 

 

 

Single phasing.

Replace blown fuse.

 

 

 

 

 

 

 

 

Compressor internal overload open.

Allow compressor motor windings to cool down to reset

 

overload. Determine cause for overload opening.

 

 

Compressor cycles on high-

High-pressure switch faulty.

Replace switch.

 

 

 

pressure switch —

 

 

 

 

 

Airflow restricted. Dirty coil.

Remove obstruction, clean condenser coil.

Condenser fan on

Air recirculating.

Clear airflow area.

 

 

 

 

 

 

 

 

 

Recover, evacuate and recharge as required. Refer to

 

Noncondensables in system.

Carrier GTAC-II, Module 5, Charging, Recovery,

 

 

Recycling, and Reclamation.

 

 

 

 

Refrigerant overcharge.

Recover as required.

 

 

 

 

Refrigerant system restrictions.

Check or replace filter drier, expansion

 

valve, etc.

 

 

 

 

 

 

 

 

Compressor cycles on high-

Fan slips on shaft.

Tighten fan hub screws.

 

 

 

pressure switch —

 

 

 

 

 

Motor not running.

Check power and capacitor 1/

3

and

3/ hp motor.

Condenser fan off

 

 

 

4

Motor bearings seized.

Replace motor.

 

 

 

 

 

 

 

 

Motor overload open.

Check overload rating. Check for fan blade obstruction.

 

Motor burned out, windings open.

Replace motor.

 

 

 

Compressor cycles on low-

Filter drier plugged.

Replace filter drier.

 

 

 

pressure switch —

 

 

 

 

 

Expansion valve power head

Replace power head.

 

 

 

Evaporator fan running

 

 

 

defective.

 

 

 

 

 

 

 

 

 

Low refrigerant charge.

Find leak, repair, evacuate system, and recharge.

 

Expansion valve restricted/plugged.

Remove and replace expansion valve.

Airflow restricted —

Evaporator coil iced up.

Check refrigerant charge.

 

 

 

Low suction pressure

 

 

 

 

 

Evaporator coil dirty.

Clean coil fins.

 

 

 

 

 

 

 

 

Indoor-air filter dirty.

Clean or replace filters.

 

 

 

 

Indoor-air dampers closed.

Check damper operation and position.

Indoor (evaporator) fan stopped —

Electrical connections loose.

Tighten all connections.

 

 

 

Low suction pressure

 

 

 

 

 

Fan relay defective.

Replace relay.

 

 

 

 

 

 

 

 

Motor overload open.

Check power supply.

 

 

 

 

Motor defective.

Replace motor.

 

 

 

 

Fan belt broken or slipping.

Replace or tighten belt.

 

 

 

Compressor runs but

Refrigerant charge low.

Add charge.

 

 

 

cooling insufficient —

 

 

 

 

 

Head pressure low.

Check refrigerant charge.

 

 

 

Suction pressure low

 

 

 

Indoor-air filters dirty.

Clean or replace filters.

 

 

 

 

 

 

 

 

Expansion valve power head

Replace power head.

 

 

 

 

defective.

 

 

 

 

 

 

 

 

 

Expansion valve restricted/plugged.

Remove and replace expansion valve.

 

Evaporator coil partially iced.

Check low-pressure setting.

 

 

 

 

Evaporator airflow restricted.

Remove obstruction.

 

 

 

Compressor runs but

 

 

 

 

 

cooling insufficient —

Heat load excessive.

Check for open doors or windows.

 

Suction pressure high

 

 

 

 

 

NOTE: See Fig. 15 and 16 for component arrangements.

13

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Contents Contents Important Read Before InstallingSafety Considerations Locate the Unit InstallationII. RIG and Place Unit III. Compressor MountingPhysical Data Service Valve Connections Dimensions ft-inWeight Chart lb Electrical ConnectionsRefrigerant Piping Sizes Field Power Supply FigLiquid Line Data Control Voltage Connections Power Wiring ConnectionsElectrical Data Accessory List VI. Accessory InstallationAccessory PRE-START-UPCare and Maintenance START-UP START-UP and AdjustmentsCondenser Coil Service CleaningII. Lubrication CompressorsVI. Crankcase Heater Compressor RemovalVII. Refrigerant Charge IX. High Flow Valves VIII. Refrigerant Service PortsSymptom Cause Remedy Troubleshooting GuideCAP LPSOFC CLOOutdoor Unit START-UP ChecklistControls Indoor UnitIII. START-UP