Trane WC-IOM-7 manual Test Cooling Set Point CSP and Heating Set Point HSP, Ztemp

Page 52

Troubleshooting

Zone Temperature Sensor (ZTS) Test

Note: These procedures are not for programmable or digital models and are conducted with the Zone Sensor Module electrically removed from the system.

Test 1

Zone Temperature Thermistor (ZTEMP)

This component is tested by measuring the resistance between terminals 1 and 2 on the Zone Temperature Sensor. Below are some typical indoor temperatures, and corresponding resistive values.

Table 8.

		Nominal	Nominal CSP
		ZTEMP	or HSP
Zone Temperature		Resistance	Resistance

50 F°	10.0 C°	19.9 K-Ohms	889 Ohms

55 F°	12.8 C°	17.47 K-Ohms	812 Ohms

60 F°	15.6 C°	15.3 K-Ohms	695 Ohms

65 F°	18.3 C°	13.49 K-Ohms	597 Ohms

70 F°	21.1 C°	11.9 K-Ohms	500 Ohms

75 F°	23.9 C°	10.50 K-Ohms	403 Ohms

80 F°	26.7 C°	9.3 K-Ohms	305 Ohms

85 F°	29.4 C°	8.25 K-Ohms	208 Ohms

90 F°	32.2 C°	7.3 K-Ohms	110 Ohms

Test 2

Cooling Set Point (CSP) and Heating Set Point (HSP)

The resistance of these potentiometers are measured between the following ZSM terminals. Refer to the chart above for approximate resistances at the given setpoints.

Cool SP = Terminals 2 and 3

Range = 100 to 900 Ohms approximate

Heat SP = Terminals 2 and 5

Range = 100 to 900 Ohms approximate

52	Packaged Heat Pump • WC-IOM-7

Image 52

Contents Packaged Heat Pump DecemberModel Number Description Hazardous Voltage w/Capacitors Contains RefrigerantEquipment Damage From Ultraviolet UV Lights Contents Contents Model Number Description General Information Clogged Filter Switch Optional General InformationRlci ReliaTel LonTalk Communication Interface Optional Rtom ReliaTel Options Module OptionalCompressor Disable CPR1/2 Power Exhaust Control OptionalLow Pressure Control High Pressure Control OptionalLead/Lag Control Dual Circuit Only Zone Sensor Module ZSM BAYSENS007BZone Sensor Module ZSM BAYSENS009B Zone Sensor BAYSENS011BHigh Temperature Sensor BAYFRST001A Remote Zone Sensor BAYSENS013CRemote Zone Sensor BAYSENS014C Remote Zone Sensor BAYSENS016AUnit Inspection Smoke Detector Sensor OptionalFirst Aid Measures Fiberglass WoolStorage Unit Clearances Unit Dimensions Unit Dimensions Unit Dimensional Data 12 1/2 Ton, 15 TonUnit Dimensional Data 20 Ton Horizontal Duct Dimensional Data 12 1/2 Ton, 15 Ton Heavy Objects Improper Unit LiftRigging Installation If a Curb Accessory Kit is not usedHorizontal Units DuctworkInstallation Factory Installed EconomizerMain Electrical Power Requirements Low Voltage Wiring AC & DC RequirementsFilter Installation Condensate Drain ConfigurationField Installed Power Wiring Main Unit Power Standard WiringOptional Tbue Wiring Through the Base Electrical Option Use Copper Conductors OnlyControl Power Transformer Field Installed Control WiringHazardous Voltage Controls using 24 VAC Rtrm Smoke Detector Customer Low Voltage Wiring Smoke detector wiringInstallation Space Temperature Averaging Temperature vs. Resistance Voltage Imbalance Live Electrical Components Electrical Phasing Three Phase MotorsCompressor Crankcase Heaters Optional ReliaTel Controls Pre-Start Test ModesPre-Start Verifying Proper Air Flow Units with Belt Drive Indoor FanReturn Air Smoke Detector Start Up Economizer Start-UpRotating Components Compressor Start-UpHeating Start-Up Start UpScroll Compressors Final System Setup Maintenance Fan Belt Adjustment Belt Drive UnitsMaintenance Monthly Maintenance Hazardous VoltageCooling Season Return Air Smoke Detector MaintenanceFilters Coil Cleaning Heating SeasonHazardous Pressures Final ProcessSample maintenance log Hazardous Service Procedures TroubleshootingReliaTel Control Troubleshooting System Status Checkout ProcedureSystem Failure MethodHeat Failure Resetting Cooling and Heating LockoutsCool Failure Clogged Filter Switch Zone Temperature Sensor ZTS Service IndicatorFan Failure Switch Test Cooling Set Point CSP and Heating Set Point HSP ZtempTesting serial communication voltage Test System Mode and Fan SelectionProgrammable & Digital Zone Sensor Test ReliaTel Refrigeration Module Rtrm Default Chart Unit Operation without a Zone SensorUnit Economizer Control ECA Troubleshooting ReliaTel Control Wiring Diagrams Drawing Number DescriptionWarranty Heat PumpWarranty Page WC-IOM-7