Bunn ULTRA-2 manual Testing Compressor Windings/Insulation with a Meg- ger

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SERVICE (cont.)

COMPRESSOR (EMBRACO) (ULTRA-2)

Compressor Windings & Related Component Testing:

Note: Measure the resistance (ohms) between termi- nal pins C&S and C&R around ambient temperature of 77° F. Add the resistance between C & S and C & R. The sum should equal the resistance found between S & R. A 10% deviation is acceptable.

Continuity must be present between C & S and C & R. If there is no continuity on start or run winding, there is an interruption within that winding.

Check the C (common) compressor winding to com- pressor ground terminal/housing. If continuity is present, one of the compressor windings is shorted to ground.

Check Compressor Windings for Ground Fault:

Upon removal of the protective terminal cover, if evi- dence is shown by any lead or terminal being over- heated, it is a good indication that a compressor wind- ing problem may exist. Follow the recommended step below to check the compressor winding insulation. If a ground fault is detected with the compressor, keep the power off, thermal protector and potential relay disconnected. A licensed certified refrigerant techni- cian will need to replace a defective compressor.

Testing Compressor Windings/Insulation with a Meg- ger

A megger is a preferred test over using a typical ohm meter for testing the compressor windings. The meg- ger checks the insulation factor of a winding making sure it is actually insulated and not leaking current (Ground Fault). An ohm meter usually produce a low voltage for reading resistance verses a megger uses higher direct voltage source to measure insulation re- sistance to detect a breakdown in the motor winding insulation.

Step 1: Disconnect all electrical power to the BUNN ULTRA-2 HP.

Step 2: Access compressor terminal pins and discon- nect the wire leads going to the compressor pins.

Step 3: Set the megger to the compressor applicable voltage rating. If the megger you are using only has a few specific voltage ranges, select the next highest voltage above your compressor volt range.

Step 4: Connect one lead of the megger to the copper suction line or housing. Connect the other lead to one of the compressor terminal pins (winding).

Step 5: Repeat the procedure for the two remaining terminal pins. If the instrument indicates any resis- tance less than 2 megohms between any pin and the housing (copper suction line), a ground fault exists. Replace compressor.

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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-2Other and disconnect from Be taken when handling Hopper From the rear of the drum Under spring tension. SpreadOne side of the handle first, then SurfaceDrums and press the seals Firmly into place as shownAuger nose Assemble the drip traySanitizing Procedure Materials requiredPreventive Maintenance Normal OperationRequired Regular Maintenance Kit ContentsInstructions DescriptionRequired Regular Maintenance Troubleshooting No PowerBoard Troubleshooting Chills but Won’t freeze Set into DAY modeSet into ICE mode Is display showing Done Adjust CleanTroubleshooting No cooling At all Troubleshooting Freezes, but not Thick enough Adjust thickness Screen higherBrix 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 OpenTroubleshooting Temperature Sensor Error Temperature Sensor ShortedTemperature Sensor Open Troubleshooting Clean Filter Messages Filter Needs CleaningFreezing is Disabled Monthly reminderService Component Access PanelsSERVICEcont Auger MotorsMotor 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 AssyService Compressor Embraco ULTRA-2 Model T-2155Model T-2168 Secure compressor to the dispenser chassis using four Compressor Specification CSR Motor Wiring DiagramCompressor Model Capacitor RatingsImportant Safeguards Compressor Wiring DiagramTesting Compressor Windings/Insulation with a Meg- ger Disconnect all electrical power to the Bunn ULTRA-2 HPExternal Thermal Protector Potential Start Relay Mounting PositionStart Capacitor Run CapacitiorCompressor Appliances ULTRA-1 Compressor ThermalRelay Terminals Service Service Compressor Danfoss ULTRA-1B Compressor Capacitor Terminals Service Relay or Contactor on Early Models Control Board TIC boardCooling Drum Alignment Cooling Drum Shipping SupportFront of the condenser Test Procedures Use cable ties to secure wires away from fan bladesFAN 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 AssemblyService LED Lamps Disconnect the black and red leads from the LEDsLamp 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 Do not Turn on AugersTransformer LoadCoolant Schematic ULTRA-1 Coolant Schematic ULTRA-2 ULTRA-1 Triacs TH1 & MOV4 Controls AugerLiquid AUTO-FILL Board ULTRA-2 Triacs TH6 & MOV6 Controls Right AugerInput and Output Chart ULTRA-1 Schematic Wiring Diagram ULTRA-1 Input and Output Chart ULTRA-2 Schematic Wiring Diagram ULTRA-2 AF 41084
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ULTRA-2 specifications

The Bunn ULTRA-2 is an exceptional frozen beverage dispenser that caters to both commercial and home use, making it a popular choice in various establishments such as cafes, restaurants, and convenience stores. Renowned for its reliability and efficiency, the ULTRA-2 serves a wide range of frozen beverages, including slushes, smoothies, and frozen cocktails, providing an irresistible treat for customers.

One of the standout features of the Bunn ULTRA-2 is its high-capacity design. With a dual hopper system, this machine allows operators to serve two different flavors simultaneously. Each hopper can hold up to 3.2 gallons of product, allowing for continuous service without the need for frequent refills. This is particularly advantageous during peak hours when demand is high.

The ULTRA-2 is equipped with Bunn's advanced refrigeration technology, which ensures rapid freezing and consistent product quality. The machine uses a patented freezing mechanism that maintains optimal product texture and temperature, resulting in a smooth, uniform consistency that keeps customers coming back for more. Additionally, the ULTRA-2's adjustable temperature control allows operators to customize the consistency of the beverages to their liking.

User-friendliness is another hallmark of the Bunn ULTRA-2. The machine features intuitive controls that simplify operation, making it easy for staff to learn and use efficiently. A built-in safety feature prevents the machine from operating when the hoppers are too low, minimizing waste and ensuring product quality.

Durability and ease of maintenance are also prominent characteristics of the ULTRA-2. Constructed from high-quality stainless steel, the machine offers enhanced longevity and is resistant to rust and corrosion. The removable hoppers and door assemblies facilitate quick cleaning and maintenance, allowing businesses to keep the machine in top working condition with minimal effort.

In summary, the Bunn ULTRA-2 stands out in the crowded market of frozen beverage dispensers through its dual hopper functionality, advanced refrigeration technology, user-friendly design, and robust construction. Whether for a busy café or a family gathering, the ULTRA-2 provides a reliable solution for delivering delicious frozen beverages that satisfy a variety of tastes and preferences.
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