Carrier PCV015-060 Replacing the Wshp Open Controller’s Bat, Troubleshooting, A50-8163

Page 40

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 Bat-

tery — 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. 34 and 35, and Table 29)

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. 34 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. 35.

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 29 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

Temperature (degF)

Fig. 34 — Thermistor Nominal Resistance

 

AIR

 

 

 

 

AIRFLOW

COIL

AIRFLOW

 

 

 

 

 

(°F)

 

(°F)

 

 

 

a50-8163

 

 

 

 

 

THERMISTOR

 

 

 

 

 

 

 

 

EXPANSION

COAX

 

 

 

 

VALVE

 

 

 

 

FP2

FP1

 

 

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. 35 — FP1 and FP2 Thermistor Location

SUCTION

COMPRESSOR

DISCHARGE

40

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Contents Contents Safety ConsiderationsInstallation General203 218 50PCH,PCV Unit Physical Data209 224 8412 Connections 50PCHOpening Unit IPTTypical Installation 50PCH Units A50-8413 Typical Vertical Installation 50PCV Units Mount the Unit Install Condensate DrainA50-8489 Metal Hose Minimum Bend Radii A50-6261tfSlope to drain Wire Field Power Supply FittingLOC BMCMves NECRVS TXVHigh-Pressure Water Switch Power BlockHpws Clippable Field Selection JumperLoss of Charge Pressure Switch Condensate Pan Motorized Valve End Switch Temperature SwitchA50-8493 LONNational Electrical Code Temperature Switch A50-8440A50-8355 A50 83548356 LWT Wshp Open Control 50PCH,PCV Unit Electrical Data A50-8162MCA FLA HacrA50-8441 Wire Field ControlsA50-8442 Rnet Wiring Specifications Rnet WiringField-Supplied Sensors for Wshp Open Controller SPT SensorsPRE-START-UP Blower Speed Selection50PCV Blower Performance with Hot Water Reheat HWR Option 50PCV Blower Performance with Wet Coil50PCH,PCV Blower Performance Standard Unit 50PCH,PCV Blower Performance High-Static UnitDeluxe 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 LimitsWater Temperature Change Through Heat Exchanger Unit Start-Up Cooling ModeOperating Limits 50PCH,PCV Units 50PC030 Typical Unit Operating Pressures and Temperatures 50PC024 Typical Unit Operating Pressures and Temperatures50PC036 Typical Unit Operating Pressures and Temperatures 50PC042 Typical Unit Operating Pressures and Temperatures 50PC048 Typical Unit Operating Pressures and Temperatures50PC060 Typical Unit Operating Pressures and Temperatures Temp GPM/ton Pressure HeatUnit Start-Up Heating Mode Unit Start-Up with Wshp Open ControlsCoaxial Water Pressure Drop 50PC Pressure DROP, psi kPaGpm 30 F 50 F 70 F 90 F SizeApproximate Fluid Volume gal Per 100 Ft of Pipe Antifreeze Percentages by VolumeOperation Units with Aquazone Complete C ControlUnits with Wshp Open Multiple Protocol Auxiliary Modulating Hot Water/Steam Heating Reheat Page Complete C and Deluxe D Board System Test Complete C Control LED Code Fault DescriptionsAquazone Deluxe D Control LED Indica Description Status LED Test LED ServiceESD Air Coil Fan Motor Removal Refrigerant Charging’ to 4’ Replacing the Wshp Open Controller’s Bat 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 2009 Carrier Corporation 50PCH,PCV START-UP Checklist II. START-UPHeating Cycle Analysis Cooling Cycle AnalysisA50-8445 A50-8446

PCV015-060 specifications

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