Bard CH3S1, CH4S1, CH5S1 Solid State Heat Pump Control Troubleshooting Procedure

Page 20

TROUBLESHOOTING

SOLID STATE HEAT PUMP CONTROL TROUBLESHOOTING PROCEDURE

1.Turn on AC power supply to indoor and outdoor units.

2.Turn thermostat blower switch to fan on. The indoor blower should start. (If it doesn’t, troubleshoot indoor unit and correct problem.)

3.Turn thermostat blower switch to auto position. Indoor blower should stop.

4.Set system switch to heat or cool. Adjust thermostat to call for heat or cool. The indoor blower, compressor, and outdoor fan should start.

NOTE: If there was no power to 24 volt transformer, the compressor and outdoor fan motor will not start for 5 minutes. This is because of the compressor short cycle protection.

TABLE 5

TROUBLESHOOTING

SYMPTOM

POSSIBLE CAUSES

 

WHAT TO CHECK

 

HOW TO CHECK OR REPAIR

 

 

 

 

Compressor

Control circuit wiring

Check for R connection at unit

Run R connection to outdoor unit to power heat

contactor does not

 

and 24 volt between R - C

pump control.

energize (heating or

 

 

 

 

 

Compressor lock out

1.

Check for 24V between

1.

If no voltage between L1-C, turn thermostat

cooling).

 

 

L1-C on heat pump control.

 

off and on again to reset high pressure

 

 

 

 

 

 

 

 

 

switch.

 

 

2.

Check across high

2.

If high pressure switch is open and will not

 

 

 

pressure switch

 

reset, replace high pressure switch.

 

 

 

 

 

Compressor short cycle

Check for 24 V between CC-C

If no voltage between CC-C, jumper speed up

 

protection

and Y-C on heat pump control.

terminal, and within 10 seconds power should

 

 

 

 

appear between CC-C. Remove speed up

 

 

 

 

jumper after 10 seconds.

 

 

 

 

 

Heat pump control

Check all other possible

Replace heat pump control.

 

defective

causes. Manual 2100-065.

 

 

 

 

 

 

 

Contactor defective

Check for open or shorted coil

Replace contactor.

 

 

winding.

 

 

 

 

 

 

 

Power phasing not

Check for red LED on phase

Switch two power leads to the unit.

 

correct

monitor (3 phase units only).

 

 

 

 

 

 

Fan outdoor motor

Motor defective

Check for open or shorted

Replace motor.

does not run

 

motor winding.

 

 

(cooling or heating

 

 

 

 

 

Motor capacitor

Check capacitor rating. Check

Replace capacitor.

except during

defective

for open or shorted capacitor.

 

 

defrost).

 

 

 

 

 

 

 

Heat pump control

Check across fan relay on

Replace heat pump control.

 

 

defective

heat pump control (Com-NC).

 

 

 

 

 

 

Reversing valve

Reversing valve solenoid

Check for open or shorted coil.

Replace solenoid coil.

does not energize

coil defective

 

 

 

 

(heating only).

 

 

 

 

 

Heat pump control

Check for 24V between RV-C

1.

Check control circuit wiring.

 

 

defective

and B-C.

2.

Replace heat pump control.

 

 

 

 

 

Unit will not go into

Temperature sensor or

Disconnect temperature

1.

If unit goes through defrost cycle, replace

defrost

heat pump control

sensor from board and jumper

 

temperature sensor.

(heating only).

defective

across speed up terminals and

 

 

 

 

sen jump terminals. This

2.

If unit does not go through defrost cycle,

 

 

should cause the unit to go

 

replace heat pump control.

 

 

through a defrost cycle within

 

 

 

 

one minute.

 

 

 

 

 

 

 

Unit will not come

Temperature sensor or

Jumper across speed up

1.

If unit comes out of defrost cycle, replace

out of defrost

heat pump control

terminals. This should cause

 

temperature sensor.

(heating only).

defective

the unit to come out of defrost

2.

If unit does not come out of defrost cycle,

 

 

within one minute.

 

replace heat pump control.

 

 

 

 

 

 

 

 

 

 

 

 

Manual

2100-455A

Page

20 of 25

Image 20
Contents Installation Instructions Wall Mounted Package Heat Pumps Contents Getting Other Information and Publications For More INFORMATION, Contact These PublishersElectric Heat Table Wall Mount General InformationHeat Pump Wall Mount Model Nomenclature CH3S1 Unit Dimensions CH4S1 and CH5S1 Unit Dimensions Electrical Specifications Single Circuit Dual CircuitShipping Damage GeneralDuct Work FiltersMounting the Unit Installation InstructionsWall Mounting Information CH3S1 Wall Mounting Instructions 6XSSO\2SHQLQJ Electric Heat Clearance Wall Mounting Instructions OpeningFalse Wall Installation Ducted Supply Return At Unit Common Wall Mounting InstallationsWiring Main Power Wiring LOW Voltage WiringThermostat Wire Size TAP RangeStart UP LOW Voltage ConnectionsApplication LOW Voltage Connections For DDC ControlStart UP CONT’D Phase Monitor Service HintsSequence of Operation Compressor Current & Pressure Control ModuleDefrost Cycle Defrost Control BoardTroubleshooting TroubleshootingSolid State Heat Pump Control Troubleshooting Procedure Checking Temperature Sensor Outside Unit Circuit Temperature F VS Resistance R of TemperatureFAN Blade Setting Dimensions FAN Blade Setting FAN Blade DimensionCompressor Solenoid Removal of FAN ShroudMaximum ESP of Operation Refrigerant Charge Subcooling LevelIndoor Blower Performance Pressure Table High Capacity CoolingPressure Table
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