Carrier PTV Over/Under Voltage, Code 7 Auto Resetting, Performance Monitor, No Fault Code Shown

Page 52

Table 32 — WSHP Troubleshooting (cont)

FAULT

HEATING

COOLING

POSSIBLE CAUSE

SOLUTION

Over/Under Voltage —

X

X

Under voltage

Check power supply and 24 vac voltage before and during operation.

Code 7 (Auto Resetting)

 

 

 

 

 

 

 

Check power supply wire size.

 

 

 

 

 

 

 

 

Check compressor starting.

 

 

 

 

Check 24 vac and unit transformer tap for correct power supply voltage.

 

X

X

Over voltage

Check power supply voltage and 24 vac before and during operation.

 

 

 

 

Check 24 vac and unit transformer tap for correct power supply voltage.

Performance Monitor —

X

 

Heating mode FP2>125 F

Check for poor airflow or overcharged unit.

Code 8

 

 

 

 

 

X

Cooling mode FP1>125 F OR

Check for poor water flow or airflow.

 

 

 

 

 

FP2<40 F

 

FP1 and FP2 Thermistors

X

 

FP1 temperature is higher

Swap FP1 and FP2 thermistors.

— Code 9

 

 

than FP2 temperature.

 

 

 

X

FP2 temperature is higher

Swap FP1 and FP2 thermistors.

 

 

 

than FP1 temperature.

 

No Fault Code Shown

X

X

No compressor operation

See Scroll Compressor Rotation section.

 

X

X

Compressor overload

Check and replace if necessary.

 

X

X

Control board

Reset power and check operation.

Swapped Thermistor —

X

X

FP1 and FP2 swapped

Reverse position of thermistors.

Code 9

 

 

 

 

Unit Short Cycles

X

X

Dirty air filter

Check and clean air filter.

 

X

X

Unit in 'Test Mode'

Reset power or wait 20 minutes for auto exit.

 

X

X

Unit selection

Unit may be oversized for space. Check sizing for actual load of space.

 

X

X

Compressor overload

Check and replace if necessary.

Only Fan Runs

X

X

Thermostat position

Ensure thermostat set for heating or cooling operation.

 

X

X

Unit locked out

Check for lockout codes. Reset power.

 

X

X

Compressor overload

Check compressor overload. Replace if necessary.

 

X

X

Thermostat wiring

Check Y and W wiring at heat pump. Jumper Y and R for compressor

 

 

 

 

operation in Test mode.

Only Compressor Runs

X

X

Thermostat wiring

Check G wiring at heat pump. Jumper G and R for fan operation.

 

 

 

 

Check Y and W wiring at heat pump. Jumper Y and R for compressor

 

 

 

 

operation in test mode.

 

X

X

Fan motor relay

Jumper G and R for fan operation. Check for line voltage across BR

 

 

 

 

contacts.

 

 

 

 

Check fan power enable relay operation (if present).

 

X

X

Fan motor

Check for line voltage at motor. Check capacitor.

Unit Does Not Operate in

 

X

Reversing valve

Set for cooling demand and check 24 vac on RV coil and at control.

Cooling

 

 

 

 

 

 

 

If RV is stuck, run high pressure up by reducing water flow and while

 

 

 

 

 

 

 

 

operating, engage and disengage RV coil voltage to push valve.

 

 

X

Thermostat setup

Check for 'O' RV setup not 'B'.

 

 

X

Thermostat wiring

Check O wiring at heat pump. Jumper O and R for RV coil 'Click'.

Insufficient Capacity/

X

X

Dirty filter

Replace or clean.

Not Cooling or Heating

 

 

 

 

X

 

Reduced or no airflow in heating

Check for dirty air filter and clean or replace.

Properly

 

 

 

 

Check fan motor operation and airflow restrictions.

 

 

 

 

 

 

 

 

External static too high. Check blower performance per Tables 9-13.

 

 

X

Reduced or no airflow in cooling

Check for dirty air filter and clean or replace.

 

 

 

 

Check fan motor operation and airflow restrictions.

 

 

 

 

External static too high. Check blower performance per Tables 9-13.

 

X

X

Leaky ductwork

Check supply and return air temperatures at the unit and at distant duct

 

 

 

 

registers if significantly different, duct leaks are present.

 

X

X

Low refrigerant charge

Check superheat and subcooling per Tables 20-23.

 

X

X

Restricted metering device

Check superheat and subcooling per Tables 20-23. Replace.

 

 

X

Defective reversing valve

Set for cooling demand and check 24 vac on RV coil and at control.

 

 

 

 

If RV is stuck, run high pressure up by reducing water flow and while

 

 

 

 

operating, engage and disengage RV coil voltage to push valve.

 

X

X

Thermostat improperly located

Check location and for air drafts behind thermostat.

 

X

X

Unit undersized

Recheck loads and sizing check sensible cooling load and heat pump

 

 

 

 

capacity.

 

X

X

Scaling in water heat exchanger

Perform condenser cleaning.

 

X

X

Inlet water too hot or cold

Check load, loop sizing, loop backfill, ground moisture.

LEGEND

LED — Light-Emitting Diode

RV — Reversing Valve

TXV — Thermostatic Expansion Valve

52

Image 52
Contents Contents Safety ConsiderationsInstallation GeneralPhysical Data 50PTH, PTV, PTD026-072 Units 50PTH026-072 Dimensional Data Typical Installation 50PTH Unit Aux Electric Heat Disconnect50PTV Dimensional Data 50PTD Dimensional Data Side Discharge Back DischargeInstall Condensate Drain Mount the UnitRotate Move to SideHorizontal Unit Pitch Trap Condensate DrainTypical Ground-Water Piping Installation Drains field-installedWater Quality Guidelines Wire Field Power SupplyMetal Hose Minimum Bend Radii 50PTH,PTV,PTD Electrical Data Alarm Relay Contacts Sensor, Water Coil Freeze ProtectionRVS TransECM BM ECM Alarm Relay Contacts Discharge Temp Switch Relay/Contactor Coil A50-8363 A50 8364LWT SPTA50-8571 Wshp Open ControlField-Supplied Sensors for Wshp Open Controller Rnet Wiring SpecificationsSPT Sensors Wire Field Controls Rnet WiringWire Terminal A50-8443A50-8141 A50-7764tfA50-8441 A50-8442Cooling Settings Dehumidificaton Mode SettingsHeating Settings CFM Adjust SettingsBlower Performance Data Wshp Open Fan Only / Low Fan and Med Fan Airflow PRE-START-UPWshp Open High Fan Airflow Deluxe D Control Jumper Settings Complete C Control Jumper SettingsField Selectable Inputs DIP Switch Block S2 Accessory 1 Relay Options DIP Switch Block S2 Accessory 2 Relay OptionsHumidistat/Dehumidistat Logic Deluxe D DIP Switch Settings Units with Modulating Hot Water Reheat HWR OptionMode Input Output HWR Operating ModesSTART-UP Operating LimitsA50-8145 Water Out Operating Limits 50PTH, PTV, PTD UnitsUnit Start-Up Heating Mode Unit Start-Up Cooling ModeWater Temperature Change Through Heat Exchanger Suction Discharge Super Sub Water Air Temp Unit Start-Up with Wshp Open Controls A50-8444Unit 50PTH, PTV Water Temperature F GPM Coaxial Water Pressure DropPTD 026 038 049Approximate Fluid Volume gal Per 100 Ft of Pipe Antifreeze Percentages by VolumeOperation Units with Aquazone Complete C ControlUnits with Wshp Open Multiple Protocol Page Page Complete C Control LED Code Fault Descriptions LED Status Description of Operation Alarm RelayLED Fault Description Code Complete C and Deluxe D Board System TestAlarm Relay Aquazone Deluxe D Control LED IndicaService Troubleshooting Refrigerant ChargingAir Coil Fan Motor Removal Replacing the Wshp Open Controller’s Bat90.0 80.070.0 KOhm 60.0 50.0Page ECM Troubleshooting Fault Description SolutionECM Pin Connectors A50-8448ECM Troubleshooting Flow Diagram A50-8447Fault Heating Cooling Possible Cause Solution Wshp TroubleshootingGood Practices Code 7 Auto Resetting No Fault Code ShownOver/Under Voltage Performance MonitorTemperature in Heating High Head PressureLow Suction Pressure Low Discharge AirAppendix 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 Page Copyright 2010 Carrier Corporation 50PTH,PTV,PTD START-UP Checklist II. START-UPHeating Cycle Analysis Cooling Cycle AnalysisA50-8449 A50-8450