Bunn ULTRA-1 manual Temperature Sensor

Page 52

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

 

FIG. 62 TEMPERATURE SENSOR

52

41084 102709

 

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Contents ULTRA-1 ULTRA-2 Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Contents User NoticesIntroduction Temp & Torque Screen Operating Controls ULTRA-1 Switch upper left corner of the control pad Operating Controls ULTRA-2Recommended Daily Cleaning ULTRA-2 shown Other and disconnect from Be taken when handling HopperFrom the rear of the drum Under spring tension. Spread One side of the handle first, thenRecommended Daily Cleaning Drums and press the sealsFirmly into place as shown Auger noseSanitizing Procedure Auto-fill Cleaning Instructions With Brixing Pump InstalledMaterials required Preventive Maintenance Normal OperationRequired Regular Maintenance Semi Annual Kit ContentsInstructions DescriptionRequired Regular Maintenance No Power TroubleshootingBoard Troubleshooting Chills but Won’t freeze Set into DAY modeSet into ICE mode Is display showing Done Adjust CleanTroubleshooting No cooling At all Yes Dirty? Check fan Have a certifiedAdjust thickness Screen higher Troubleshooting Freezes, but not Thick enoughBrix ratio Too much Troubleshooting Noise Auger jumping Check fanDrum alignment Check auger shaft bushings Auger won’t turnTroubleshooting Torque Sensor ErrorTorque Sensor Error Torque Sensor Shorted Torque Sensor OpenTemperature Sensor Shorted Troubleshooting Temperature Sensor ErrorTemperature Sensor Open Troubleshooting Clean Filter Messages Filter Needs CleaningFreezing is Disabled Monthly reminderService Component Access PanelsAuger Motors SERVICEcontMotor Coil Resistance Auger Motor Capacitor Auger Motor CapacitorsAuger Shaft Assembly Auger Shaft AssemblyService Auger Shaft ASSEMBLYcont Remove and clean condenser air filter, FigTest Procedures Remove the wires from the circuit breakerCircuit Breaker Location120V Compressors 230V Compressors Compressor Start Relay Terminals Service Compressor Embraco ULTRA-2 Compressor AssyModel T-2155 Service Compressor Embraco ULTRA-2Model T-2168 Secure compressor to the dispenser chassis using four Compressor Appliances ULTRA-1 Compressor ThermalRelay Terminals Service Service Compressor Danfoss ULTRA-1B Compressor Capacitor Terminals Service Relay or Contactor on Early Models Control Board Control Board ULTRA-2Cooling Drum Alignment Cooling Drum Shipping SupportUse cable ties to secure wires away from fan blades Front of the condenser Test ProceduresFAN ULTRA-2 FAN ULTRA-1 FANHOT GAS Temperature Sensor Alternate TestLamp Cord Wires Lamp Cord AssyLamp Cord Connector Lamp Cord ConnectorLamp HOLDER/SOCKET Assembly Lamp HOLDER/SOCKET AssemblyLamp Relay ULTRA-2 ULTRA-1Membrane Switch ULTRA-2 Ribbon CableMembrane Switch ULTRA-1 Refer to and connect the ribbon cable to the Control BoardSolenoids WHI from Main HarnessTemperature Sensor Temperature SensorTorque Sensor Circuit Board Remove the cover and set aside for reassemblyDo not Turn on Augers Transformer LoadCoolant Schematic ULTRA-1 Coolant Schematic ULTRA-2 ULTRA-1 Triacs Triac MAP for ULTRA-1TH1 & MOV4 Controls Auger Liquid AUTO-FILL Board ULTRA-2 Triacs Triac Maps for ULTRA-2TH6 & MOV6 Controls Right Auger Input and Output Chart ULTRA-1 41084 Input and Output Chart ULTRA-2 41084 41084
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ULTRA-1 specifications

The Bunn ULTRA-1 is a state-of-the-art coffee brewing system designed for commercial use, offering an unmatched combination of speed, efficiency, and flavor extraction. This single-serve coffee brewer is tailored for businesses that require high-quality coffee brews in a fast-paced environment, such as cafes, restaurants, and office kitchens.

One of the standout features of the Bunn ULTRA-1 is its ability to brew up to 14 different cup sizes, accommodating various customer preferences. This flexibility allows operators to serve everything from small espresso shots to larger coffee servings, making it a versatile addition to any beverage-serving establishment. At the heart of this brewing system is Bunn's patented brewing technology, which ensures precise water temperature and ideal brew time, optimizing the extraction process for a full-bodied flavor profile.

The ULTRA-1 is equipped with a large, easy-to-read LCD screen that provides real-time feedback, allowing users to monitor brewing progress, select cup sizes, and customize brewing parameters. This intuitive interface simplifies operation, reducing the learning curve for new staff members and enhancing overall efficiency during peak hours.

Another innovative aspect of the Bunn ULTRA-1 is its advanced thermal carafe system, which keeps brewed coffee at the optimal serving temperature without the need for a traditional warming plate. This technology helps preserve the coffee's rich flavor and aroma by preventing it from becoming bitter or stale due to prolonged exposure to heat.

The ULTRA-1 emphasizes ease of maintenance with its removable brew chamber and drip tray, allowing for quick cleaning and routine upkeep. Additionally, the brewer features a self-diagnostic system, alerting operators to any potential issues, further minimizing downtime.

From its sleek design to its robust construction, the Bunn ULTRA-1 combines aesthetics and durability, making it a reliable choice for any coffee-centric business. The compact design ensures it can fit on counters without taking up excessive space, while its stainless steel components provide longevity and resistance to wear and tear.

In conclusion, the Bunn ULTRA-1 stands out in the crowded market of commercial coffee brewers due to its advanced technology, versatility, and user-friendly features. It is designed to meet the demands of modern coffee service while ensuring that every cup brewed meets the highest standards for taste and quality.
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