Table Of Contents - Bunn Ultra NX Service & Repair Manual

Equipment Notices & Safeguards ................................................................................ 4
Operating Controls ...................................................................................................... 5
Software Program Informational Screens .................................................................... 7
Product Instructions ..................................................................................................... 8
Brix Pump/Autofill Set-Up Diagram .............................................................................. 9
CFV/Autofill Set-Up Diagram ..................................................................................... 10
Preventive Maintenance ............................................................................................ 11
Troubleshooting ......................................................................................................... 15
Fault Messages ......................................................................................................... 24
Equipment Service Panels ........................................................................................ 27
Service - Front Panel Components ............................................................................ 28
Control & Autofill Board ....................................................................................... 28
Membrane Switch ............................................................................................... 29
Service - Hopper Lid Assembly ................................................................................. 31
Service - Rear Cover Components ............................................................................ 32
Mag Contact Assembly ....................................................................................... 32
Left & Right Auger Motor ..................................................................................... 33
Left and Right Auger Motor Capacitor ................................................................. 35
Left & Right Torque Sensor Board ....................................................................... 36
Left & Right PTC Heater ..................................................................................... 38
Left & Right Cooling Drum Temperature Sensor ................................................. 40
CF CFIVE Solenoid Valves - CFV/Autofill ........................................................... 41
Left & Right Pressure Switch - CFV/Autofill ........................................................ 43
CF CFIVE Solenoid Valves - LAF/Autofill ............................................................ 44
Left & Right Refrigerant Solenoids ...................................................................... 46
Left & Right Auger Shaft Assembly ..................................................................... 47
Service - Left Side Panel Components ...................................................................... 49
Refrigeration Hot Gas Temperature Sensor ........................................................ 49
Condenser Fan Assembly ................................................................................... 50
Service - Right Side Panel Components ................................................................... 51
Compressor Relay .............................................................................................. 51
Power Supply ...................................................................................................... 52
R-290 Compressor Hazard Classification & Safeguards .................................... 54
R-290 Compressor .............................................................................................. 55
R-290 Compressor Start & Run Capacitor .......................................................... 57
R-290 Compressor Start Relay ........................................................................... 60
R290 Compressor Relay, Start & Run Wiring and Coolant Diagram ......................... 61
Control Board Triac Diagram and Control Board Input & Output Chart ..................... 63
Ultra NX Wiring Schematic ....................................................................................... 66
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CONTENTS
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