Carrier Comprehensive Guide to Air Coil Fan Motor Removal and Troubleshooting for Your Heat Pump
Page 40

Air Coil Fan Motor Removal

CAUTION

Before attempting to remove fan motors or motor mounts, place a piece of plywood over evaporator coils to prevent coil damage.

Disconnect motor power wires from motor terminals before motor is removed from unit.

1.Shut off unit main power supply.

2.Loosen bolts on mounting bracket so that fan belt can be removed.

3.Loosen and remove the 2 motor mounting bracket bolts on left side of bracket.

4.Slide motor/bracket assembly to extreme right and lift out through space between fan scroll and side frame. Rest motor on a high platform such as a step ladder. Do not allow motor to hang by its power wires.

Replacing the WSHP Open Controller’s Battery — The WSHP Open controller’s 10-year lithium CR2032 battery provides a minimum of 10,000 hours of data retention during power outages.

NOTE: Power must be ON to the WSHP Open controller when replacing the battery, or the date, time and trend data will be lost.

1.Remove the battery from the controller, making note of the battery's polarity.

2.Insert the new battery, matching the battery's polarity with the polarity indicated on the WSHP Open controller.

TROUBLESHOOTING

(Fig. 32 and 33, and Table 32)

When troubleshooting problems with a WSHP, consider the following.

Thermistor — A thermistor may be required for single- phase units where starting the unit is a problem due to low voltage. See Fig. 32 for thermistor nominal resistance.

Control Sensors — The control system employs 2 nom- inal 10,000 ohm thermistors (FP1 and FP2) that are used for freeze protection. Be sure FP1 is located in the discharge fluid and FP2 is located in the air discharge. See Fig. 33.

WSHP Open Controller — With the WSHP Open con- troller option, the 100 most recent alarms can be viewed using the BACview6 alarm status and alarm history.

To view the alarms:

1. Navigate to the Alarm Status screen from the Home screen using the arrow softkeys. The screen will display the current alarm status, either normal or Alarm, and al- low for scrolling through the unit’s alarm status.

2. From the Alarm Status screen, press the Alarm softkey to view the 100 most recent alarms which are labeled with date and time for easy reference.

NOTE: Active faults can be viewed by scrolling down, these faults indicate a possible bad sensor or some condi- tion which may not merit an alarm.

3. To view alarms which have been corrected, scroll down through the Alarm screen to Return Top Normal screen.

NOTE: Alarms are automatically reset once alarm con- dition has been corrected.

See Table 32 for possible alarm cause and solution.

 

90.0

 

80.0

 

70.0

(kOhm)

60.0

50.0

Resistance

40.0

 

30.0

 

20.0

 

10.0

 

0.0

0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0

a50-6270ef

Temperature (degF)

 

Fig. 32 — Thermistor Nominal Resistance

a50-8163

AIRFLOW

(°F)

THERMISTOR

AIR

COIL

AIRFLOW

(°F)

EXPANSION

VALVE

FP2FP1

COAX

SUCTION

COMPRESSOR

DISCHARGE

 

CONDENSATE

 

 

 

 

 

 

 

 

 

 

 

 

OVERFLOW

LIQUID

 

 

 

 

 

(CO)

 

 

 

 

 

 

 

LINE

WATER IN

WATER OUT

 

LEGEND

 

 

AIR COIL

 

 

WATER

 

 

 

 

COAX — Coaxial Heat Exchanger

FREEZE

 

 

 

 

COIL

 

 

 

 

 

Airflow

PROTECTION

 

 

 

 

 

 

PROTECTION

 

 

Refrigerant Liquid Line Flow

Fig. 33 — FP1 and FP2 Thermistor Location

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Contents Contents Safety ConsiderationsInstallation GeneralPhysical Data 50PCH,PCV Units Size A50-8695IPT A50-7842ef Electric HeatA50-8696 Side Discharge Back DischargeInstall Condensate Drain Mount the UnitA50-8489 A50-6260efA50-6261tf A50-6262efMetal Hose Minimum Bend Radii Copper FPT/PVCWire Field Power Supply FittingA50-8490 Sensor, Low Temperature Protection Air Coil A50-8491RVS Reversing Valve SolenoidA50-8492 HpwsA50-8493 LONNational Electrical Code Optional Wiring Temperature Switch A50-8440A50 86978698 Units with Deluxe D and Wshp Open Multiple Protocol ControlsWshp Open Control 50PCH,PCV Unit Electrical Data A50-8162A50-8441 Wire Field ControlsA50-8442 Rnet Wiring Specifications Rnet WiringField-Supplied Sensors for Wshp Open Controller SPT SensorsPRE-START-UP 50PCH,PCV Blower Performance Standard Unit 50PCH,PCV Blower Performance High-Static UnitFAN Rated MIN PCV Speed Airflow CFMDeluxe D Control Jumper Settings Refer to , 15, Complete C Control Jumper Settings Refer toField Selectable Inputs DIP Switch Block S2 Accessory 1 Relay Options DIP Switch Block S2 Accessory 2 Relay OptionsSTART-UP Operating LimitsUnit Start-Up Cooling Mode Water Temperature Change Through Heat ExchangerOperating Limits 50PCH,PCV Units Cooling Heating Water Flow Rate GPM50PC006 Typical Unit Operating Pressures and Temperatures 50PC009 Typical Unit Operating Pressures and Temperatures50PC012 Typical Unit Operating Pressures and Temperatures Entering Cooling Heating Water50PC015 Typical Unit Operating Pressures and Temperatures 50PC018 Typical Unit Operating Pressures and Temperatures50PC024 Typical Unit Operating Pressures and Temperatures Temp GPM/ton Pressure Heat50PC030 Typical Unit Operating Pressures and Temperatures 50PC036 Typical Unit Operating Pressures and Temperatures50PC042 Typical Unit Operating Pressures and Temperatures Water Air TempUnit Start-Up Heating Mode 50PC048 Typical Unit Operating Pressures and Temperatures50PC060 Typical Unit Operating Pressures and Temperatures Unit Start-Up with Wshp Open ControlsA50-8444 BACview6 Display InterfacePressure DROP, psi kPa Coaxial Water Pressure DropGpm 30 F 50 F 70 F 90 F 10 C 21 C 32 C 006 009 Operation Units with Aquazone Complete C ControlUnits with Aquazone Deluxe D Control Units with Wshp Open Multiple ProtocolPage Auxiliary Modulating Hot Water/Steam Heating Reheat Complete C and Deluxe D Board System Test Complete C Control LED Code Fault Descriptions LED Status Description of Operation Alarm RelayLED Fault Description Code Aquazone Deluxe D Control LED IndicaDescription Status LED Test LED ServiceESD A50-6286ef Refrigerant Charging’ to 4’ Air Coil Fan Motor Removal TroubleshootingA50-8163 Troubleshooting Air temperature out of rangeCooling mode FP1125 F or Reduced or no airflow in heatReduced or no water flow Reduced airflow in coolingAppendix a Wshp Open Screen Configuration Alarm StatusStatus SensorAppendix a Wshp Open Screen Configuration MaintenanceSystem Settings ConfigurationSchedule Service Appendix a Wshp Screen Open ConfigurationTest Point Name Password Editable Range Default Level Configuration ServiceScreen Name Alarm Page Copyright 2011 Carrier Corporation 50PCH,PCV START-UP Checklist II. START-UPHeating Cycle Analysis Cooling Cycle AnalysisA50-8445 A50-8446

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