Bard WH483, WH602, WH421 Solid State Heat Pump Control Troubleshooting Procedure

Page 19

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 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 connectio 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

 

off and on again to reset high pressure

 

 

 

 

 

 

2.

control

 

switch.

 

 

Check across high presure

2.

If high pressure switch is open and will not

 

 

 

switch.

 

reset, replace high pressure switch.

 

Compressor short cycle

Check for 24 V between CC-C

If not voltage between CC-C, jumper speed

 

protection

and Y-C on heat pump control.

up 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 leds 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 ratng. 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

2.

If unit does not go through defrost cycle,

 

 

sen jump terminals. This

 

 

should caruse 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

 

 

within one minute.

 

cycle, replace heat pump control.

 

 

 

 

 

 

Manual 2100-399 Page 17

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Contents Models Installation Instructions Wall Mounted Package Heat PumpsContents For More INFORMATION, Contact These Publishers Getting Other Information and PublicationsHeat Pump Wall Mount Model Nomenclature Wall Mount General InformationElectric Heat Table Unit Dimensions Single Circuit Dual Circuit Electrical SpecificationsFilters Shipping DamageGeneral Duct WorkFresh AIR Intake Blower Damper AssemblyCondensate Drain Mounting the Unit Installation InstructionsTypical Installations Wall Mounting InformationElectric Heat Clearance Mounting InstructionsWALL-MOUNTING Instructions Common WALL-MOUNTING Installations Wiring LOW Voltage Wiring Wiring Main PowerUnit 24V Terminal Board Heat Anticipation Thermostat WiringThermostat Wire Size Compressor Cutoff and Outdoor Thermostat WiringCompressor Malfunction Light Thermostat Indicator LampsThermostat Subbase Predominant Features Emergency Heat PositionStart UP Important Installer NoteHigh Pressure Switch Three Phase Scroll Compressor Start UP InformationSequence of Operation Phase MonitorService Hints Pressure Service PortsDefrost Control Board Solid State Heat Pump Control Troubleshooting Procedure TroubleshootingTroubleshooting Temperature F VS. Resistance R of Temperature Sensor Checking Temperature Sensor Outside Unit CircuitRemoval of FAN Shroud FAN Blade Setting DimensionsRefrigerant Charge Return Air Model Cooling Pressure ALL Temperatures FMaximum ESP of Operation Electric Heat only Model WH421 WH483 WH602 Speed KW High Speed Low SpeedOptional Accessories Heating Pressures ALL Temperatures FPressure
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WH421, WH483, WH602 specifications

Bard WH602, WH421, and WH482 are distinguished models in Bard's line of high-performance wall-mounted heaters. Each unit is designed to offer reliable heating solutions for various commercial and industrial applications. These models are renowned for their energy efficiency, robust construction, and ease of use, making them ideal for a variety of environments, including warehouses, manufacturing facilities, and other large spaces.

The WH602 model boasts impressive heating capabilities, featuring a powerful fan-forced heater equipped with a 60000 BTU rating. This allows it to effectively heat large areas quickly and efficiently. One of its main features is the high-efficiency, stainless steel heat exchanger that promotes better heat transfer, enhancing the overall performance and longevity of the heater. The WH602 is designed with energy-saving technology, allowing it to operate with minimal electricity consumption while maximizing output.

The WH421 model offers a more compact solution without sacrificing power. With a heating capacity of 42000 BTU, it is suitable for medium-sized spaces. Like the WH602, the WH421 utilizes a stainless steel heat exchanger, ensuring durability and efficient heating. This model is equipped with a quiet, high-performance fan that distributes heat uniformly throughout the space, maintaining comfortable conditions without the distraction of excessive noise. Its compact design also allows for easy installation in tighter spaces.

The WH482 is a versatile model that falls between the two in terms of performance and application. Rated at 48000 BTU, it combines the benefits of both the WH602 and WH421, making it suitable for various heating demands. The WH482 features advanced control options, allowing users to set specific heating schedules and temperatures for improved comfort and energy efficiency. Additionally, it has built-in safety features like over-temperature protection and a thermal cutoff switch, ensuring safe operation in commercial environments.

All three models share key characteristics, including a robust construction built to withstand harsh conditions, user-friendly controls, and compliance with industry safety standards. Their wall-mounted design saves valuable floor space while providing powerful heating performance. Overall, Bard WH602, WH421, and WH482 represent a commitment to quality, performance, and customer satisfaction, making them top choices for businesses seeking efficient heating solutions.
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