Carrier 50PEC09-18 Refrigerant Charging, Air Coil Fan Motor Removal, Troubleshooting

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Checking System Charge — Units are shipped with full operating charge. If recharging is necessary:

1.Insert thermometer bulb in insulating rubber sleeve on liquid line near filter drier. Use a digital thermometer for all temperature measurements. DO NOT use a mercury or dial-type thermometer.

2.Connect pressure gage to discharge line near compressor.

3.After unit conditions have stabilized, read head pressure on discharge line gage.

NOTE: Operate unit a minimum of 15 minutes before checking charge. From standard field-supplied Pressure- Temperature chart for R-410A, find equivalent saturated condensing temperature.

4.Read liquid line temperature on thermometer, then subtract from bubble point temperature. The difference equals subcooling temperature.

Refrigerant Charging

WARNING

To prevent personal injury, wear safety glasses and gloves when handling refrigerant. Do not overcharge system — this can cause compressor flooding.

NOTE: Do not vent or depressurize unit refrigerant to atmo- sphere. Remove and recover refrigerant following accepted practices.

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.

Motor power wires need to be disconnected 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 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

When troubleshooting problems with a WSHP, consider the following and refer to Table 18.

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

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 18 for possible alarm cause and solution.

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Contents Safety Considerations Contents50PEC Physical Data InstallationGeneral A50-8335 OUTWater OUT CondensateA50-8338 Water22.2 OD A50-8337Damper Opening A50-833950PEC18 Bottom Return Cabinet Dimensions Right Hand Piping 50PEC09-15 Bottom Return Cabinet Dimensions Left Hand Piping 50PEC18 Bottom Return Cabinet Dimensions Left Hand Piping 50PEC09-15 Front Return Cabinet Dimensions Right Hand Piping 50PEC18 Front Return Cabinet Dimensions Right Hand Piping A50-8345 50PEC09-15 Front Return Cabinet Dimensions Left Hand Piping50PEC18 Front Return Cabinet Dimensions Left Hand Piping A50-8347 Optional Autoflow Valve Motorized 50PEC09-15 Chassis Dimensions Front ReturnWater Valve Optional Autoflow Optional FusedOptional Disconnect Box Autoflow Optional Motorized50PEC18 Chassis Dimensions Front Return Mount Unit Wire Electrical Connections09-18 A50-8452A50-8327.eps Sensor, Water Coil Freeze Protection A50-8328Return Air Sensor Night Low Limit SwitchA50-8329 Blower Motor Wiring NLL PremierLink Controller Applications with Complete C Control A50-8355 8354 A50LWT 8353 Wshp Open Control A50-8380A50-8441 Wire Low Voltage ConnectionsElectrical Data 50PEC Units A50-7467tfSPT Sensors Recommended Thermostat Wire SizesField-Supplied Sensors for Wshp Open Controller A50-8443 Install Supply and Return PipingRnet Wiring Specifications Rnet WiringTemporary Connection for Flushing System Piping PRE-START-UPMax Entering Air, dry bulb/wet bulb Air and Water LimitsMin Ambient Air Rated Ambient Air Max Ambient Air Min Entering Air Rated Entering Air, dry bulb/wet bulbWater Quality Guidelines Field Selectable Inputs Complete C Control Jumper Settings See , 18,Deluxe D Control Jumper Settings See , 20, DIP Switch Block S2 Accessory 1 Relay OptionsOperating Limits DIP Switch Block S2 Accessory 2 Relay OptionsSTART-UP Unit Start-Up/CoolingBACview6 Display Interface Unit Start-Up with Wshp Open ControlsGPM Coaxial Water Pressure DropUnits with Aquazone Complete C Control Approximate Fluid Volume gal Per 100 ft of PipeAntifreeze Percentages by Volume OperationUnits with Wshp Open Multiple Protocol Page Complete C and Deluxe D Board System Test Aquazone Deluxe D Control LED Indica Complete C Control LED Code and Fault DescriptionsService Gravity Flow Method Replacing the Wshp Open Controller’s Bat TroubleshootingRefrigerant Charging Air Coil Fan Motor RemovalFault Heating Cooling Possible Cause Solution TroubleshootingUnit Does Not Operate Sensor Appendix a Wshp Open Screen ConfigurationAlarm Status StatusConfiguration Appendix a Wshp Open Screen ConfigurationMaintenance System SettingsSchedule Optimal StartTest Appendix a Wshp Screen Open ConfigurationService Point Name Password Editable Range Default Level Configuration ServiceAlarm High Alarm LimitPage Page Copyright 2009 Carrier Corporation II. START-UP 50PEC Unit START-UP ChecklistA50-8454 Heating Cycle AnalysisCooling Cycle Analysis A50-8453
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