Manuals / Bunn / Kitchen Appliance / Beverage Dispenser

Bunn ULTRA-2 manual SERVICE cont TEMPERATURE SENSOR

Models: ULTRA-2

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SERVICE (cont.)

SERVICE (cont.)

TEMPERATURE SENSOR

ULTRA-2 shown
FIG. 61 TEMPERATURE SENSOR	P1341

Location:

The Temperature Sensor(s) are located inside the top rear of the cooling drum under the Auger Motor covers.

Test Procedures:

1.Remove the left side housing panel.

2.Connect a voltmeter, across the two leads of the temperature sensor (leave plug connected); The indication must be:

a)Approx. 1.4 vdc @ 71° F

b)Approx. 2.6 vdc @ 32° F

If voltage reading is 0v, the Control Board is not sup- plying the necessary 5v and should be replaced. If the reading stays at 5vdc, replace thermistor.

Alternate Test:

2.Disconnect the plug on thermistor leads and check resistance as indicated below.

The indication must be:

a)5650 ohms @ 32° F ± 10%

b)2000 ohms @ 77° F ± 10%

If resistance reading is not within the range listed above, replace thermistor.

Removal and Replacement:

1.Remove the two #8-32 screws securing the auger motor cover to cooling drum mount and remove cover. Set aside for reassembly.

2.Disconnect the plug on the temperature sensor leads from the connector on the dispenser main harness.

3.Pull the temperature sensor from the tube at the top rear of the cooling drum and discard.

4.Push new temperature sensor into tube at the top rear of the cooling drum as far as it will go.

5.Refer to Fig. 62 and reconnect the wires.

6.Position auger motor cover on cooling drum mount and secure with two #8-32 locking screws.

	1.	Ultra-2 Left Temperature Sensor
		WHI to TAN J13-21
		(Control Board) Positive
	1.	Ultra-2 Right Temperature Sensor
		WHI to PNK J13-22
		(Control Board) Positive
	1.	Ultra-1 Temperature Sensor
		WHI to TAN J10-3
		(Control Board) Positive
	2.	WHI to WHI/BLK Main Harness
2	1	(Control Board) Negative
2	1

FIG. 62 TEMPERATURE SENSOR

57	41084 102709

Image 57

Bunn ULTRA-2 manual SERVICE cont TEMPERATURE SENSOR

Contents

ULTRA-1 ULTRA-2 SERVICE & REPAIR MANUALBUNN-O-MATICCORPORATION 41084.0000D 03/13 2009 Bunn-O-MaticCorporationBUNN-O-MATICCOMMERCIAL PRODUCT WARRANTY Preventive Maintenance CONTENTSService USER NOTICESBasic Maintenance Safety firstFault codes INTRODUCTIONTEMP & TORQUE SCREEN DISPLAY TEMP & TORQUE161h OPERATING CONTROLS ULTRA-1 OPERATING CONTROLS ULTRA-2 RECOMMENDED DAILY CLEANING ULTRA-2shown RECOMMENDED DAILY CLEANING Continued With Brixing Pump Installed Auto-fillCleaning InstructionsSanitizing Procedure Materials requiredPREVENTIVE MAINTENANCE NORMAL OPERATIONPOSSIBLE CAUSES FOR FALSE READINGS Kit Contents REQUIRED REGULAR MAINTENANCE Semi AnnualINSTRUCTIONS DescriptionREQUIRED REGULAR MAINTENANCE Continued No Power TROUBLESHOOTINGTROUBLESHOOTING cont Chills but won’t freeze TROUBLESHOOTING cont No cooling at all thick enough TROUBLESHOOTING cont Freezes, but notAuger won’t turn TROUBLESHOOTING cont NoiseTROUBLESHOOTING cont TORQUE SENSOR ERROR Torque Sensor Error TORQUE SENSOR SHORTEDTORQUE SENSOR OPEN TEMPERATURE SENSOR SHORTED TROUBLESHOOTING cont Temperature Sensor ErrorTEMPERATURE SENSOR OPEN Thermistor unplugged or break in wiringTROUBLESHOOTING cont Clean Filter Messages “FILTER NEEDS CLEANING”“FILTER NEEDS CLEANING!!!” COMPONENT ACCESS PANELS SERVICEFIG. 1 AUGER MOTORS SERVICEcont AUGER MOTORSMOTOR COIL RESISTANCE FIG. 2 AUGER MOTOR TERMINALSFIG. 4 AUGER MOTOR CAPACITOR TERMINALS SERVICE cont AUGER MOTOR CAPACITORSERVICE cont AUGER SHAFT ASSEMBLY SERVICE cont AUGER SHAFT ASSEMBLYcont SERVICE cont CIRCUIT BREAKER Location SERVICE cont120V COMPRESSORS 230V COMPRESSORS120V DISPENSERS SERVICE cont230V DISPENSERS FIG. 16 COMPRESSOR START RELAY TERMINALSSERVICE cont Removal and Replacement Compressor AssyCOMPRESSOR AMERICOLD ULTRA-2cont SERVICE cont COMPRESSOR EMBRACO ULTRA-2 Model T-2155 SERVICE cont COMPRESSOR EMBRACO ULTRA-2contFIG. 22 THERMAL OVERLOAD PROTECTOR TERMINALS Model T-2168SERVICE cont COMPRESSOR EMBRACO ULTRA-2cont CSR Motor Wiring Diagram Compressor SpecificationCompressor Model Capacitor RatingsImportant Safeguards Compressor Wiring DiagramSERVICE cont COMPRESSOR EMBRACO ULTRA-2 Check Compressor Windings for Ground Fault SERVICE cont COMPRESSOR EMBRACO ULTRA-2Potential Start Relay Mounting Position External Thermal ProtectorStart Capacitor Run Capacitior1.Compressor Start Relay SERVICE cont COMPRESSOR APPLIANCES ULTRA-12.Compressor Run Capacitor 3.Thermal Overload ProtectorFIG. 26 RELAY TERMINALS SERVICE contFIG. 28 COMPRESSOR CAPACITOR TERMINALS COMPRESSOR APPLIANCES ULTRA-1contSERVICE cont COMPRESSOR APPLIANCES ULTRA-1contCompressor Assy SERVICE cont COMPRESSOR DANFOSS ULTRA-1Bcont FIG. 30 RELAY TERMINALS SERVICE cont COMPRESSOR DANFOSS ULTRA-1BcontSERVICE cont RELAY or CONTACTOR on Early Models TIC board SERVICE cont CONTROL BOARDSERVICE cont COOLING DRUM ALIGNMENT SERVICE cont FAN - ULTRA-2 SERVICE cont FAN - ULTRA-1SERVICE cont HOT GAS TEMPERATURE SENSOR FIG. 45 LAMP CORD ASSY SERVICE cont LAMP CORD ASSYSERVICE cont LAMP CORD CONNECTOR SERVICE cont LAMP HOLDER/SOCKET ASSEMBLY SERVICE cont LED Lamps SERVICE cont LAMP RELAY SERVICE cont MEMBRANE SWITCH ULTRA-2SERVICE cont MEMBRANE SWITCH ULTRA-1SOLENOIDS FIG. 59 SOLENOIDSSERVICE cont SERVICE cont TEMPERATURE SENSOR DO NOT TURN ON AUGERS SERVICE cont TORQUE SENSOR CIRCUIT BOARDSERVICE cont TRANSFORMERCOOLANT SCHEMATIC ULTRA-1 COOLANT SCHEMATIC ULTRA-2 ULTRA-1TRIACS TRIAC MAP for ULTRA-1TRIAC MAPS for ULTRA-2 LIQUID AUTO-FILLBOARDULTRA-2TRIACS Input and Output Chart ULTRA-1 120 VOLTS AC or 230 VOLTS AC 2WIRE SINGLE PHASE SCHEMATIC WIRING DIAGRAM ULTRA-1Configuration for CF VALVE Models 50/60 HZInput and Output Chart ULTRA-2 120 VOLTS AC SCHEMATIC WIRING DIAGRAM ULTRA-2AF230 VOLTS AC 4108441084