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Trane WC-IOM-7 manual System Failure, Method, LED 4 Service, Cooling Failure, Service Failure

Models: WC-IOM-7

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Troubleshooting

LED 4 (Service)

“On” indicates a clogged filter.

“Off” during normal operation.

“Flashing” indicates an evaporator fan failure

Below is the complete listing of failure indication causes.

System Failure

Check the voltage between terminals 6 and 9 on J6, it should read approximately 32 VDC. If no voltage is present, a System failure has occurred. Refer to Step 4 in the previous section for the recommended troubleshooting procedure.

Cooling Failure

1.Cooling and heating set point (slide pot) on the zone sensor has failed. Refer to the “Zone Sensor Test Procedure” section.

2.Zone temperature thermistor ZTEMP on ZTS failed. Refer to the “Zone Sensor Test Procedure” section.

3.CC1 or CC2 24 VAC control circuit has opened, check CC1 & CC2 coils, and any of the controls below that apply to the unit (HPC1, HPC2).

4.LPC1 has opened during the 3 minute minimum “on time” during 4 consecutive compressor starts, check LPC1 or LPC2 by testing voltage between the J1-8 & J3-2 terminals on the RTRM and ground. If 24 VAC is present, the LPC’s has not tripped. If no voltage is present, LPC’s has tripped.

Service Failure

5.If the supply fan proving switch has closed, the unit will not operate (when connected to RTOM), check the fan motor, belts, and proving switch.

6.Clogged filter switch has closed, check the filters.

Simultaneous Heat and Cool Failure

1.Emergency Stop is activated.

Method 2

The second method for determining system status is done by checking voltage readings at the RTRM (J6). The system indication descriptions and the approximate voltages are listed below.

System Failure

Measure the voltage between terminals J6-9 & J6-6.

Normal Operation = approximately 32 VDC

System Failure = less than 1 VDC, approximately 0.75 VDC

WC-IOM-7 • Packaged Heat Pump

49

Image 49

Trane WC-IOM-7 System Failure, Method, LED 4 Service, Cooling Failure, Service Failure, Simultaneous Heat and Cool Failure

Contents

Model Number DecemberInstallation Operation Maintenance Packaged Heat PumpModel Number Description Warnings and CautionsHazardous Voltage w/Capacitors Contains RefrigerantEquipment Damage From Ultraviolet UV Lights WC-IOM-7 Packaged Heat PumpContents ContentsWarranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Heat Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 WCZ, WCY, WCX, WCC, WCD, WCH, WCM, WCP and WSC Parts Only. . . . 57 Models Less Than 20 Tons for Commercial Use*. . . . . . . . . . . . . . . . . . . . . . 57 Heat Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Standard Equipment Warranty Terms and Conditions. . . . . . . . . . . . . . . . . . 58 Commercial Equipment Warranty and Liability . . . . . . . . . . . . . . . . . . . . . . . 58 Models Larger that 20 Tons for Commercial Use* ContentsModel Number Description Service digitDigit Minor design sequenceUnit Nameplate General InformationCompressor Nameplate Unit DescriptionSystem Input Devices & Functions Clogged Filter Switch OptionalGeneral Information RTOM - ReliaTel Options Module OptionalPower Exhaust Control Optional Compressor Disable CPR1/2Low Pressure Control High Pressure Control OptionalZone Sensor Module ZSM BAYSENS007B Lead/Lag Control Dual Circuit OnlyZone Sensor Module ZSM BAYSENS009B Zone Sensor BAYSENS011BRemote Zone Sensor BAYSENS013C High Temperature Sensor BAYFRST001ARemote Zone Sensor BAYSENS014C Remote Zone Sensor BAYSENS016ASmoke Detector Sensor Optional Unit InspectionGeneral Information Fiberglass Wool Precautionary MeasuresFirst Aid Measures StorageGeneral Information Unit ClearancesWC-IOM-7 Packaged Heat Pump Unit DimensionsPackaged Heat Pump WC-IOM-7 Unit DimensionsFigure 5. Roofcurb Dimensional Data 20 Ton Figure 4. Unit Dimensional Data 20 TonUnit Dimensions WC-IOM-7 Packaged Heat PumpUnit Dimensions Figure 7. Horizontal Duct Dimensional Data 20 TonPackaged Heat Pump WC-IOM-7 Heavy Objects Typical weights and point loading dataImproper Unit Lift Figure 8. Rigging and center of gravity dataUnit Dimensions RiggingIf a Curb Accessory Kit is not used InstallationFoundation General Unit RequirementsFactory Installed Economizer InstallationMain Electrical Power Requirements Low Voltage Wiring AC & DC RequirementsFilter Installation Condensate Drain ConfigurationField Installed Power Wiring Figure 9. Condensate Trap InstallationStandard Wiring Main Unit PowerOptional TBUE Wiring NOTICE Use Copper Conductors OnlyControl Power Transformer Field Installed Control WiringHazardous Voltage InstallationInstallation Controls using 24 VACPackaged Heat Pump WC-IOM-7 Installation Table 3. DC Conductors Zone Sensor Module wiringRTRM Figure 12. Smoke detector wiring Smoke Detector Customer Low Voltage WiringInstallation WC-IOM-7 Packaged Heat Pump InstallationInstallation Space Temperature AveragingPackaged Heat Pump WC-IOM-7 Installation Table 4. Temperature vs. ResistanceTemperature Hazardous VoltageInstallation Voltage ImbalanceLive Electrical Components Electrical Phasing Three Phase MotorsCompressor Crankcase Heaters Optional InstallationInstallation ReliaTel ControlsLive Electrical Components Packaged Heat Pump WC-IOM-7Pre-Start Service test guide for component operationTest Modes Verifying Proper Air Flow Pre-StartUnits with Belt Drive Indoor Fan ReliaTel ControlPre-Start Return Air Smoke DetectorEconomizer Start-Up Start UpRotating Components Compressor Start-UpHeating Start-Up Start UpScroll Compressors Start Up Final System SetupFan Belt Adjustment - Belt Drive Units MaintenanceRotating Components Monthly Maintenance Maintenancevalue shown in Table Belt tension measurement and deflection rangesCooling Season Return Air Smoke Detector MaintenanceFilters MaintenanceHeating Season Coil CleaningMaintenance Final Process Hazardous PressuresMaintenance Maintenance Sample maintenance logHazardous Service Procedures TroubleshootingReliaTel Control System Status Checkout Procedure TroubleshootingMethod LED 1 SystemService Failure LED 4 ServiceSystem Failure MethodHeat Failure Resetting Cooling and Heating LockoutsCool Failure TroubleshootingClogged Filter Switch Zone Temperature Sensor ZTS Service IndicatorFan Failure Switch TroubleshootingTest Zone Temperature Thermistor ZTEMP Zone Temperature Sensor ZTS TestTest Cooling Set Point CSP and Heating Set Point HSPTesting serial communication voltage LED Indicator Test, SYS ON, HEAT, COOL & SERVICEProgrammable & Digital Zone Sensor Test Test System Mode and Fan SelectionSystem mode and fan selection chart ReliaTel Refrigeration Module RTRM Default ChartUnit Operation without a Zone Sensor TroubleshootingTroubleshooting Unit Economizer Control ECA TroubleshootingReliaTel Control Drawing Wiring DiagramsNumber DescriptionHeat Pump WarrantyModels Less Than 20 Tons for Commercial Use Standard Equipment Warranty Terms and Conditions WarrantyCommercial Equipment Warranty and Liability Models Larger that 20 Tons for Commercial UsePage WC-IOM-7 Literature Order NumberDate 12/04