Carrier 50PTH, PTV Refrigerant Charging, Air Coil Fan Motor Removal, Troubleshooting, ’ to 4’

Page 45

FILL CONDENSER WITH CLEANING SOLUTION. DO NOT ADD SOLUTION MORE RAPIDLY THAN VENT CAN EXHAUST GASES CAUSED BY CHEMICAL ACTION.

VENT

PIPE

3’ TO 4’

PAIL

FUNNEL

1”

PIPE

5’ APPROX

CONDENSER

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.

PAIL

Fig. 35 — Gravity Flow Method

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

PUMP PRIMING CONN.

SUCTION

PUMP

SUPPORT

TANK

FINE MESH

SCREEN

GAS VENT

GLOBE

VALVES

SUPPLY

1” PIPE

CONDENSER

REMOVE WATER

REGULATING VALVE

RETURN

removed.

3. Loosen and remove the 2 motor mounting bracket bolts

on left side of bracket.

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.

Fig. 36 — Forced Circulation Method

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.

4.From standard field-supplied Pressure-Temperature chart for R-410A refrigerant, find equivalent saturated con- densing temperature.

5.Read liquid line temperature on thermometer; then subtract from saturated condensing temperature. The dif- ference equals subcooling temperature.

6.Compare the subcooling temperature with the normal temperature listed in Tables 20-23. If the measured liquid line temperature does not agree with the required liquid line temperature, ADD refrigerant to raise the tempera- ture or REMOVE refrigerant (using standard practices) to lower the temperature (allow a tolerance of ± 3° F).

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:

Thermistor — A thermistor may be required for single- phase units where starting the unit is a problem due to low voltage. See Fig. 37 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. 38.

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Contents Safety Considerations ContentsGeneral InstallationPhysical Data 50PTH, PTV, PTD026-072 Units 50PTH026-072 Dimensional Data Aux Electric Heat Disconnect Typical Installation 50PTH Unit50PTV Dimensional Data 50PTD Dimensional Data Back Discharge Side DischargeMount the Unit Install Condensate DrainRotate Move to SideTrap Condensate Drain Horizontal Unit PitchDrains field-installed Typical Ground-Water Piping InstallationWire Field Power Supply Water Quality GuidelinesMetal Hose Minimum Bend Radii 50PTH,PTV,PTD Electrical Data Sensor, Water Coil Freeze Protection Alarm Relay ContactsTrans RVSECM BM ECM Alarm Relay Contacts Discharge Temp Switch Relay/Contactor Coil A50-8363 8364 A50SPT LWTWshp Open Control A50-8571Rnet Wiring Specifications Field-Supplied Sensors for Wshp Open ControllerSPT Sensors Rnet Wiring Wire Field ControlsWire Terminal A50-8443A50-7764tf A50-8141A50-8441 A50-8442Dehumidificaton Mode Settings Cooling SettingsHeating Settings CFM Adjust SettingsBlower Performance Data PRE-START-UP Wshp Open Fan Only / Low Fan and Med Fan AirflowWshp Open High Fan Airflow Complete C Control Jumper Settings Deluxe D Control Jumper SettingsField Selectable Inputs DIP Switch Block S2 Accessory 2 Relay Options DIP Switch Block S2 Accessory 1 Relay OptionsHumidistat/Dehumidistat Logic Deluxe D DIP Switch Settings Units with Modulating Hot Water Reheat HWR OptionHWR Operating Modes Mode Input OutputOperating Limits START-UPA50-8145 Water Out Operating Limits 50PTH, PTV, PTD UnitsUnit Start-Up Cooling Mode Unit Start-Up Heating ModeWater Temperature Change Through Heat Exchanger Suction Discharge Super Sub Water Air Temp A50-8444 Unit Start-Up with Wshp Open ControlsCoaxial Water Pressure Drop Unit 50PTH, PTV Water Temperature F GPMPTD 026 038 049Antifreeze Percentages by Volume Approximate Fluid Volume gal Per 100 Ft of PipeOperation Units with Aquazone Complete C ControlUnits with Wshp Open Multiple Protocol Page Page LED Status Description of Operation Alarm Relay Complete C Control LED Code Fault DescriptionsLED Fault Description Code Complete C and Deluxe D Board System TestAquazone Deluxe D Control LED Indica Alarm RelayService Refrigerant Charging TroubleshootingAir Coil Fan Motor Removal Replacing the Wshp Open Controller’s Bat80.0 90.070.0 KOhm 60.0 50.0Page Fault Description Solution ECM TroubleshootingA50-8448 ECM Pin ConnectorsA50-8447 ECM Troubleshooting Flow DiagramWshp Troubleshooting Fault Heating Cooling Possible Cause SolutionGood Practices No Fault Code Shown Code 7 Auto ResettingOver/Under Voltage Performance MonitorHigh Head Pressure Temperature in HeatingLow Suction Pressure Low Discharge AirAlarm Status Appendix a Wshp Open Screen ConfigurationStatus SensorMaintenance Appendix a Wshp Open Screen ConfigurationSystem Settings ConfigurationSchedule Appendix a Wshp Screen Open Configuration ServiceTest Configuration Service Point Name Password Editable Range Default LevelScreen Name Alarm Page Page Copyright 2010 Carrier Corporation II. START-UP 50PTH,PTV,PTD START-UP ChecklistCooling Cycle Analysis Heating Cycle AnalysisA50-8449 A50-8450
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