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41087.0001

1. 14 Frother and Mixing Whipper 2 255 15 Whipper GUO 16 Control Board and 18 TIES ISR WIGE sa WIGHT a 21 Main Power ON OFF S Wite 154222 teed a ese 22 Door Panel Assembly Canteens 23 24 Holder SOCK GE scr 25 EED DOOr LIGNIS shh 26 nicer 27 Potentiometer shut R 28 Hopper bevel Indicator 29 IOP DG owiteh asserens be 30 Door 31 Pressure Regulator and Needle Valve
2. 32 Dispense Solenode a aaea 33 Wirmo Diagrams 34 USER NOTICES All notices on the equipment are written for your protection All notices are to be kept in good condition Replace any unreadable or damaged labels 3 41087 1 060112 OPERATING INSTRUCTIONS 1 On the Ultra touch pad make the following set tings a POWER ON b DAY NIGHT DAY 2 Pull the Powder Auto Fill fully forward on its sup port rails and open the door 3 Fill the Powder Auto Fill product hopper as fol lows a Pull the slide gate closed on the Powder Auto Fill product hopper elbow and remove the hopper from the Powder Auto Fill b Remove the lid from the product hopper and fill the hopper with a powdered granita mix Install the product hopper into the Powder Auto Fill Insure hopper is fully seated behind retainer plates d Push the slide gate on the hopper ejector elbow to the open position 4 Place the ON OFF switch at the Powder Auto Fill whipper panel to ON 5 After allowing 5 seconds for the Powder Auto Fill to initialize observe the door lamp The door lamp should not be lit If the door lamp is lit consult the fault list located on the decal placed on the back of the door Clear the fault before proceeding NOTE If the Powder Auto Fill is being used for the first time with
3. POWDER AUTO FILL For ULTRA 2 SERVICE amp REPAIR MANUAL BUNN O MATIC CORPORATION POST OFFICE BOX 3227 www bunn com PHONE 217 529 6601 FAX 217 529 6644 SPRINGFIELD ILLINOIS 62708 3227 41087 0001A 06 12 2012 Bunn O Matic Corporation BUNN O MATIC COMMERCIAL PRODUCT WARRANTY Bunn O Matic Corp BUNN warrants equipment manufactured by it as follows 1 Airpots thermal carafes decanters GPR servers iced tea coffee dispensers MCP MCA pod brewers thermal servers and Thermofresh servers mechanical and digital 1 year parts and 1 year labor 2 All other equipment 2 years parts and 1 year labor plus added warranties as specified below a Electronic circuit and or control boards parts and labor for 3 years b Compressors on refrigeration equipment 5 years parts and 1 year labor Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis parts and labor for 4 years or 40 000 pounds of coffee whichever comes first These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the applicable warranty period This warranty does not apply to any equipment component or part that was not manufactured BUNN or that in BUNN s judgment has been affected by misuse negle
4. once a day Open the cabinet door Pull the mixing chamber out of the whipper cham ber Twist the whipper chamber clockwise and pull it off the whipper chamber receptacle Pull the frother off the motor shaft Notice the flat keyway on the shaft and the matching keyway inside the frother It is important that these two keyways are lined up when reassembling Twist the whipper chamber receptacle clockwise and pull it off the motor shaft Slip the O ring off the whipper chamber recep tacle Wash components in a mild solution of dish deter gent using a bristle brush Rinse thoroughly and allow to dry before reinstalling in the machine Wiper Blade Shaft Wiper Blade sS Wiper Drive Gear Auger Drive Bracket an Auger Drive BO Shaft SQ Ring Auger a Ejector Elbow Slide Gate Mixing Chamber Whipper Chamber Receptacle O ring Frother Dispense Tip Whipper Chamber Thorough cleaning of the hopper once a week 1 2 3 Open the cabinet door Remove the hopper base assembly from the cabinet remove the cover and empty the contents Pull the ejector elbow off the hopper base remove the slide gate from the ejector elbow Remove the wiper blade and drive gear by removing the retaining ring from the wiper blade shaft Remove the auger by pulling it out of the front hopper base Remove t
5. Spring 6 Auger Motor 7 Improper adjustment of product mix ratio 1 Plumbing lines 2 Water supply 1 Lamp 2 Lamp Holder REMEDY Refer to Service Control Board and Probe for testing procedures See page 18 Refer to Service Dispense Solenoid Valve for testing procedures See page 32 Refer to Service Whipper Motor for testing procedures See page 16 Refer to Service Frother for testing procedures See page 15 Refer to Service Dispense Solenoid Valve for testing procedures See page 32 Refer to Service Auger Drive for testing procedures See page 13 Refer to Service Auger Spring for testing procedures See page 13 Refer to Service Auger Motor for testing procedures See page 14 Set the product mix ratio per Adjust ments See page 5 Plumbing lines should not be resting on the counter top A The dispenser must be connected to a cold water line B Water pressure to the dispenser must not exceed 90 psi 620 kPa Install a regulator if necessary to lower the working pressure to ap proximately 50 psi 345 kPa Refer to Service Lamp for testing procedures See page 25 Refer to Service Lamp Holder for testing procedures See page 25 41087 1 060112 SERVICE This section provides procedures for testing and replacing various major components used in this dispenser should service become necessary Refer to Troubleshooting for assistance in determining the cause of any problem
6. dispenser 12 Refer to Fig 18 when reconnecting the wires BLK to WHI at Lamp Holder or RED at LED Harness BLK to BLK at Lamp Holder or BLK at LED Harness FIG 18 LAMP CORD WIRES 23 41087 1 060112 SERVICE cont LAMP CORD CONNECTOR FIG 19 LAMP CORD CONNECTOR Location The lamp cord connector is located on top of the dispenser Test Procedures 1 2 3 5 Disconnect the dispenser from the power source Disconnect the lamp cord from the lamp cord con nector Disconnect the plug on the dispenser main harness from the connector from the lamp cord connector Check the voltage across the two pin holes on the main harness plug with a voltmeter and Day Night switch inthe DAY position and the ON OFF switch in the ON position Verify that the dispenser hop per is full and in place the platform probe contact is making contact with the ULTRA liquid level probe and the dispenser door is closed Connect the dis penser to the power source The indication must be approximately 12 6 volts ac Disconnect the dispenser from the power source If voltage is present as described proceed to 6 If voltage is not present as described refer to the wiring diagram and check the dispenser main wiring harness 6 Check for continuity between pin 1 red of the lamp cord connector and the center terminal of the lamp cord connector Check for continuity between
7. main power switch and close the dispenser door The indication must be 5 volts dc Disconnect the dispenser from the power source remove the jumper wire and select the OFF posi tion on the main power switch 1 If voltage is present as described proceed to 12 If voltage is not present as described replace the photo transistor 12 Check the voltage across pins 1 positive amp 3 negative of the four pin connector on the control board with a voltmeter Remove the hopper from the dispenser connect the dispenser to the power source and select the ON position of the main power switch Shine a flashlight on the photo transistor left side panel The indication must be less than 1 volt dc Disconnect the dispenser from the power source and select the OFF position on the main power switch 1 If voltage is present as described proceed to 14 If voltage is not present as described replace the photo transistor 14 Disconnect the two pin connector J2 from the control board 15 Check the voltage across pins 1 positive amp 2 negative of the two pin connector on the control board with a voltmeter Connect the dispenser to the power source and select the ON position of the main power switch The indication must be 1 5 volts de 16 Select the OFF position of the main power switch and disconnect the dispenser from the power source If voltage is present as descr
8. secure with two 74 40 screws lockwashers and nuts 7 Manually engage and release the hopper switch actuator The actuator must operate smoothly without binding at either end of its travel If the actuator operates as described proceed to 8 If the actuator does not operate as described loosen the two screws and realign the switch and repeat the process 8 Refer to Fig 29 and reconnect the wires 9 Install the hopper support panel and secure with four 8 32 screws GRN to Control Boad J1 8 P1904 RED BLK to Control Board J1 10 FIG 29 HOPPER SWITCH TERMINALS 41087 1 060112 SERVICE cont DOOR SWITCH FIG 30 DOOR SWITCH Location The door switch is located on the right side panel under the housing top cover Test Procedures 1 2 3 Disconnect the dispenser from the power source Disconnect the twelve pin connector J1 from the control board Check continuity between pins 8 amp 9 on the wiring harness using an ohmmeter Continuity must be present when the door is closed Continuity must not be present when the door is open Reconnect the twelve pin connector to the control board Gain access to the door switch using steps listed in Removal and Replacement Disconnect the wires from the door switch Check continuity between the N O and COM ter minals of the switch using an ohmmeter Continuity must be present when the actuator is engaged Continuity must not b
9. shields or safety notices PROBLEM ULTRA and Powder Auto Fill do not run Main power on ULTRA is OFF Product level in ULTRA is lower than level Probe ULTRArunning Powder Auto Fill door lamp is OFF Product level in ULTRA is lower than level Probe ULTRA running Powder Auto Fill door lamp flashes ON and OFF PROBABLE CAUSE 1 ULTRA power cord disconnected main power switch in ON posi tion 1 The ULTRA DAY NIGHT setting is in the NIGHT mode 2 Powder Auto Fill power cord disconnected 3 Powder Auto Fill main power switch in OFF position 5 Powder Auto Fill door is open 1 Low product in Powder Auto Fill REMEDY Check that the power cord is con nected to proper electrical source and that the ULTRA main power switch is in the ON position 1 The ULTRA DAY NIGHT setting should be in the DAY mode 2 Check that the Powder Auto Fill is plugged into the top of the ULTRA auger motor cover 3 Select the ON position of the main power switch 5 The Powder Auto Fill door should be closed securely Remove hopper and fill with pow dered mix 41087 1 060112 TROUBLESHOOTING cont PROBLEM Product level in ULTRA is lower than level Probe ULTRA running Powder Auto Fill door lamp flashes two times Product level in ULTRA is lower than level Probe ULTRA running Powder Auto Fill door lamp flashes three times Product level in ULTRA is lower than level Probe ULTRA running Powd
10. slide off of the motor shaft 9 Slide the slinger off of the motor shaft 10 Remove the two nuts securing the whipper chamber receptacle and whipper motor to the front panel 11 Disconnect the black leads on the motor from the white red and white brown wires of the main wiring harness and remove the motor 12 Install new motor on rear of front panel and secure with two nuts Connect the black leads from the motor to the main wiring harness Refer to Fig 9 when reconnecting wires 41087 1 060112 SERVICE cont WHIPPER MOTOR cont 13 14 15 16 17 18 19 20 Slide the slinger onto the motor shaft flush against the front panel Wash whipper chamber components in a mild solution of dish detergent using a bristle brush Rinse thoroughly and allow to dry before reinstalling in the dispenser Slide whipper chamber receptacle with seal and O ring onto the motor shaft Rotate the receptacle with seal counterclockwise until it snaps into place on the motor mounting nuts Push frother onto the motor shaft making sure the flat in the frother lines up with the flat on the motor shaft Connectthe red black and green wires to the hopper switch Fig 10 and install the hopper support panel using the four 8 32 screws Install whipper chamber on the whipper chamber receptacle by twisting counterclockwise until tabs on the whipper chamber lock with the tabs on the whipper chamber receptacle Be sure dispen
11. the potentiometer and bracket assembly to the whipper motor panel and secure with 8 32 screw Connect the three pin connector J3 to the control board Install the rear panel to the housing and secure with six 8 32 Screws 3 4 10 41087 1 060112 SERVICE cont HOPPER LEVEL INDICATOR Photo LED 29 FIG 27 HOPPER LEVEL INDICATOR Location The photo transistor and LED are located on the hopper side panels mounted just below the hopper guide rails Test Procedures Refer to the section CONTROL BOARD and LEVEL PROBE for test procedures Removal and Replacement 1 Disconnect the dispenser from the power source and the water supply 2 Remove the dispenser from the ULTRA machine and place it on a flat work surface 3 Disconnect the door lamp cord from the lamp con nector 4 Remove the two 8 32 screws securing the door hinge to the dispenser housing 5 Carefully pull the door forward until the door sup port arms come completely out of the dispenser housing and set aside 6 Remove the six 8 32 truss head screws securing the rear cover to the dispenser housing 29 Remove the six 8 32 round head screws securing the front of the housing to the side panels Remove the six 8 32 truss head screws securing the back of the housing to the side panels Carefully lift and spread the housing to remove it from the rest of the dispenser Disconnect the photo
12. the selected granita mix perform an adjust ment as described in ADJUSTMENTS 6 Close the Powder Auto Fill door and observe the following a The door lamp lights steadily b The Powder Auto Fill begins dispensing liquid granita product 7 The Powder Auto Fill will continue to fill the ULTRA product hopper until the liquid level in the ULTRA hopper reaches the product level probe or for 5 minutes which ever occurs first 8 10 11 1 13 If the Powder Auto Fill fails to fill the ULTRA hopper in 5 minutes the following will occur a The Powder Auto Fill will stop dispensing prod uct b The door lamp will flash 4 times about every 2 seconds After checking the ULTRA and Powder Auto Fill set up the 5 minute refill fault may be cleared by simply opening and closing the Powder Auto Fill door Once the product level in the ULTRA covers the auger make the following switch settings at the ULTRA control panel a AUGER 1 b ICE OFF CHILL ICE or CHILL as appropriate for the granita product From this point onward the Powder Auto Fill will continue to automatically refill the ULTRA hopper maintaining the ULTRA product at an approximate 2 gallon level When the Powder Auto Fill powder level falls low the door lamp will cycle ON and OFF but will continue to dispense product for a preset period When this period expires the Powder Auto Fill will continue to cycle the door
13. transistor J6 or LED J2 plug from the control board Cut the cable tie securing the cable assembly to the cable tie mount Gently pull the photo transistor or LED from its mounting lens Pull the photo transistor or LED through the grom met and free of the dispenser Snap the photo transistor or LED into the mount ing lens and feed the cable end through the grom met Gently bend the cable flush to the cable tie mount and secure with new cable tie Cut away excess cable tie Connect the photo transistor J6 or LED J2 plug to the control board Reassemble the dispenser top housing rear panel and door assembly to the dispenser Reconnect the dispenser to the power source and the water supply 41087 1 060112 SERVICE cont HOPPER SWITCH Location The hopper switch is located under the hopper sup port panel Test Procedures 1 Disconnect the dispenser from the power source 2 Open the dispenser door and remove the hopper 3 Manually engage and release the hopper switch ac tuator The actuator must operate smoothly without binding at either end of its travel and an audible click must be detected near the mid point of travel lf the actuator operates as described proceed to 4 If the actuator does not operate as described loosen the hopper switch mounting screws realign the switch and repeat the process If the audible click cannot be detected
14. valve coil terminals If continuity is present as described reconnect the white red and white brown wires to the solenoid If continuity is not present as described replace the solenoid valve 6 Checkthe solenoid valve for coil action Connect the dispenser to the power source Press the dispense switch and listen carefully for a clicking sound as the magnet attracts 7 Disconnect the dispenser from the power source If the sound is heard as described and water will not pass through the solenoid valve there may be a block age in the water line before the solenoid valve or the solenoid valve may require inspection for wear and the removal of waterborne particles lf the sound is not heard as described replace the solenoid valve Removal and Replacement 1 Disconnect the dispenser from the power source and the water supply 2 Remove the six 8 32 screws securing the rear panel to the dispenser 3 Remove the white red and white brown wires from the solenoid valve 4 Disconnect the water lines to and from the solenoid valve 5 Remove the two 8 32 nuts securing the solenoid mounting bracket to the dispenser base Remove the solenoid and bracket assembly 6 Remove the two 10 32 screws and lockwashers securing the solenoid valve to the bracket 7 Install a new solenoid valve to the bracket using two 10 32 screws and lockwashers 8 Install the solenoid and bracket to the base and secure with two
15. 8 32 nuts 9 Install the water lines to and from the solenoid valve using pipe thread sealant BOM M2526 0000 and tighten securely 10 Refer to Fig 34 when reconnecting the wires WHI RED to Control Board J7 2 WHI BRN to Control 1909 FIG 34 DISPENSE SOLENOID TERMINALS 41087 1 060112 Board J7 4 SCHEMATIC WIRING DIAGRAM 12 MAIN POWER SWITCH tie yy to pe i Not Used With Optional BRN MAIN POWER Water Bypass SWITCH gyi alt BLU WHIPPER MOTOR 120V 24V or 230V 24V tens DISPENSE SOLENOID HOPPER MOTOR Early Models With Incandescent fo DOOR LAMP RED 1 WHI GRN i tee BLK 22 3a GRY 0 BLK gt BLK CH EEE fell N WHI ORN T AGA GRN L TEST SERVICE SWITCH RED BLK 1 WHVORN Ag SERVICE BLU BLK 9 5 l 0 BLUBLK MOTOR A LOW PRODUCT es eres ADJUST j3 R DETECT D ee Hee ee ee ee 4 HOPPER Lae RIBBED BLK SWITCH f 5 SMOOTH BLK Eate Wiodels With LED Cited Doors DOOR SWITCH 0 ef Sl E 120 VOLTS 2 WIRE 230 VOLTS AC 2 WIRE PNK ru SINGLE PHASE 50 60 HZ 34 41087 1 060112
16. ROUBLESHOOTING A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems encountered If the problem remains after exhausting the troubleshooting steps contact the Bunn O Matic Technical Service Department Inspection testing and repair of electrical equipment should be performed only by qualified service person nel All electronic components have 120 volt ac and low voltage dc potential on their terminals Shorting of terminals or the application of external voltages may result in board failure Intermittent operation of electronic circuit boards is unlikely Board failure will normally be permanent If an intermittent condition is encountered the cause will likely be a switch contact or a loose connection at a terminal or crimp Solenoid removal requires interrupting the water supply to the valve Damage may result if solenoids are energized for more than ten minutes without a supply of water The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened This will help to avoid twists and kinks in the tubing e Make certain that all plumbing connections are sealed and electrical connections tight and isolated e Keep away from combustibles WARNING Exercise extreme caution when servicing electrical equipment e Unplug the dispenser when servicing except when electrical tests are specified e Follow recommended service procedures e Replace all protective
17. SSEMBLY FIG 17 LAMP CORD ASSY Location The lamp cord assembly is located in the top of the dispenser Test Procedures 1 2 3 Disconnect the dispenser from the power source Unplug the lamp cord assembly from lamp cord connector assembly Check for continuity across the tip of the cord as sembly and the housing Continuity must not be present when the lamp is removed If continuity is present as described the cord assembly is Operating properly If continuity is not present as described replace the cord assembly Removal and Replacement 1 Disconnect the lamp cord assembly from the lamp cord connector assembly in the top of the dispenser 2 Openthe dispenser doorand remove the five screws securing the rear cover to the door 3 Disconnect the lamp cord assembly from the lamp holder socket assembly and set the rear panel aside 4 Cut the terminals off of the lamp cord assembly 5 Remove lamp cord assembly from the door as sembly and discard 6 Push new lamp cord wires through the holes on the top of the door assembly 7 Strip the wires from the new lamp cord approxi mately 281 8 Using the two terminals supplied crimp the new terminals to the lamp cord assembly and connect them to the lamp holder socket assembly wires 9 Reinstall the rear panel to the door assembly 10 Close the door 11 Plug in the new lamp cord assembly to the lamp cord connector assembly on top of the
18. WARNING Inspection testing and repair of electrical equipment should be performed only by qualified service personnel The dispenser should be unplugged when servicing except when electrical tests are required and the test procedure specifically states to plug in the dispenser COMPONENT ACCESS WARNING Disconnect the dispenser from the power source before the removal of any panel or the replace ment of any component All components are accessible by opening the door removal of the door panel removal of the dispenser rear panel hopper hopper support plate and top wrap around cover Refer to Fig 1 FIG 1 COMPONENT LOCATIONS 41087 1 060112 SERVICE cont AUGER DRIVE COMPONENTS FIG 2 AUGER DRIVE COMPONENTS Location The auger drive components are located in the bottom of the hopper assembly Removal Cleaning and Replacement 1 2 1 1 Open the dispenser door Lift the hopper assembly over the retainer plates 16 on hopper support plate 12 and slide hopper assembly out the front of the dispenser Remove hopper lid 1 and empty product Pull off the ejector elbow 15 and remove the slide gate 21 Remove retainer ring 11 and washer 10 from the bottom of the hopper base 9 Remove wiper shaft 3 wiper blade 4 and wiper drive gear 5 from the hopper base 9 Remove auger wire 14 by pulling it out the front of the hopper base 9 Remove auger drive s
19. and coffee cherry design Safety Fresh savemycoffee com Scale Pro Silver Series Single Smart Funnel Smart Hopper SmartWAVE Soft Heat SplashGard The Mark of Quality in Beverage Equipment Worldwide ThermoFresh Titan trifecta Velocity Brew A Partner You Can Count On Air Brew Air Infusion Beverage Bar Creator Beverage Profit Calculator Brew better not bitter BUNNSource Coffee At Its Best Cyclonic Heating System Daypart Digital Brewer Control Nothing Brews Like a BUNN Pouring Profits Signature Series Tea At Its Best The Horizontal Red Line Ultra are either trademarks or registered trademarks of Corporation 2 41087 1 030912 5 telat 3 tls ad Se 4 5 Preventive Maintenance Cleaning miia a ate Ma scndellers ecto Geieomecy 6 er Dene nee MOMSEN OM ter eee eer ener 7 TIO UTD TS SNOT E 8 cone sh eho 12 Drive COM POMC INS 5a ca0c sere 4A 13
20. ated under the hopper support panel mounted to the left of the whipper motor Test Procedures 1 2 4 Disconnect the dispenser from the power source Disconnect the four pin connector from the main wiring harness from the four pin connector on the transformer Check the voltage across the black wire pin 1 and the white wire pin 2 on the plug from the main wiring harness Connect the dispenser to the power source The indication must be a 120 volts ac for 120 volt models b 230 volts ac for 230 volt CE models Disconnect the dispenser from the power source If voltage is present as described reconnect the plug and the connector and proceed to 5 If voltage is not present as described refer to the wiring diagrams and check the main wiring harness 27 5 Check the voltage between J1 2 and J1 3 on the twelve pin connector at the control board Connect the dispenser to the power source The indication must be 24 volts ac If voltage is present as described the transformer is Operating properly If voltage is not present as described replace the transformer Removal and Replacement 1 Remove the hopper from the dispenser 2 Remove the four 8 32 screws securing the hopper support panel to the dispenser 3 Disconnect the red black and green wires from the hopper switch and set the hopper support panel aside 4 Disconnectthe transformer four pin connector from the four pin plug on the main wiring
21. ck leads of the whipper motor With the ULTRA hopper level lower than the probe press and hold the SERVICE switch and check the voltage across the disconnected harness wires with a voltmeter Connect the dispenser to the power source The indication must be a 120 volts ac for 120 volt models b 230 volts ac for 230 volt CE models 4 Disconnect the dispenser from the power source If voltage is present as described replace the motor If voltage is not present as described refer to the wiring diagrams and check the dispenser wiring harness 16 Removal and Replacement 1 Disconnect the dispenser from the power source Open the dispenser door and remove the hopper assembly out the front of the dispenser Remove the four 8 32 screws securing the hopper Support panel to the auger motor mounting panel and the whipper motor mounting panel Slowly lift the hopper support panel up and discon nect the red black and green wires from the hopper switch Pull the mixing chamber out of the whipper cham ber Twist the whipper chamber clockwise and pull it off the whipper chamber receptacle Pull the frother off the motor shaft Notice the flat side on the shaft and the matching flat inside the frother It is important that these two flats are lined up when reassembling Slide the receptacle with seal off of the motor shaft NOTE To remove the receptacle only rotate clockwise until the receptacle clears the nuts and
22. ct alteration improper installation or operation improper maintenance or repair non periodic cleaning and descaling equipment failures related to poor water quality damage or casualty In addition the warranty does not apply to replacement of items subject to normal use including but not limited to user replaceable parts such as seals and gaskets This warranty is conditioned on the Buyer 1 giving BUNN prompt notice of any claim to be made under this warranty by telephone at 217 529 6601 or by writing to Post Office Box 3227 Springfield Illinois 62708 3227 2 if requested by BUNN shipping the defective equipment prepaid to an authorized BUNN service location and 3 receiving prior authorization from BUNN that the defective equipment is under warranty THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY WRITTEN OR ORAL EX PRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF EITHER MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE The agents dealers or employees of BUNN are not authorized to make modifications to this warranty or to make additional warranties that are binding on BUNN Accordingly statements by such individuals whether oral or written do not constitute warranties and should not be relied upon If BUNN determines in its sole discretion that the equipment does not conform to the warranty BUNN at its exclusive op tion while the equipment is under warranty shall either 1 provide a
23. d at the lower left rear of the dispenser Check the voltage across the terminals first of the dispense solenoid and then of the hopper motor with voltmeter Connect the dispenser to the power source and select the ON position of the main power switch The indication must be a 120 volts ac for 120 volt models b 230 volts ac for 230 volt CE models at the dispense solenoid and between 4 and 26 volts dc at the hopper motor after a delay of approximately 10 seconds 14 Touch the free end of the jumper wire to the dispenser housing The indication must be 0 zero after a delay of up to 5 seconds 1 15 Move the jumper wire away from the housing The indication must again be a 120 volts ac for 120 volt models b 230 volts ac for 230 volt CE models at the dispense valve solenoid and between 4 and 26 volts dc at the hopper motor after a delay of up to 5 seconds 16 Disconnect the dispenser from the power source remove the jumper wire and select the OFF posi tion on the main power switch If voltage is present as described The liquid level control circuitry is operating properly If voltage is not present as described replace the control board 18 41087 1 060112 SERVICE cont CONTROL BOARD and LEVEL PROBE cont Test Procedure Low Product Detect 1 Disconnect the dispenser from the power source 2 Disconnect the twelve pin connector J1 from the control board Checkth
24. e lamp holder socket assembly from the lamp cord terminals 6 Remove the lamp 7 Remove 2 56 screw and elastic lock nut securing the lamp holder socket assembly to the mounting bracket Remove the lamp holder socket assembly and discard 8 Install new lamp holder socket assembly on mount ing bracket using the 2 56 screw and lock nut 9 Reinstall lamp 10 Connect the new lamp holder socket assembly to the lamp cord terminals 11 Reinstall the rear door cover to the dispenser door Make sure wires are located in notch in door flange 12 Close the dispenser door 13 Plug in the lamp cord assembly to the lamp cord connector assembly on top of the dispenser 14 Refer to Fig 22 when reconnecting the wires D n oam at Lamp FIG 22 LAMP HOLDER SOCKET ASSEMBLY WIRES 41087 1 060112 SERVICE OPTIONAL LED DOOR LIGHTS FIG 23 LED DOOR LIGHTS Location The LED door lights are located inside the dispenser door Test Procedures 1 Disconnect the lamp cord from the lamp cord con nector 2 Disconnect the black and red leads from the LEDs 3 Check the voltage across the two leads with a volt meter and Day Night switch in the DAY position and the ON OFF switch in the ON position Verify that the dispenser hopper is full and in place the dispenser probe contact is making contact with the ULTRA liquid level probe and the dispenser door is closed Reconnect
25. e present when the actuator is released If continuity is present as described refer to wiring diagram and check the dispenser wiring harness If continuity is not present s described replace the door switch Removal and Replacement 1 Disconnect the dispenser from the power source 2 Remove the hopper assembly from the dispenser 3 Remove the dispenser from the CDS machine and place it on a flat work surface 4 Disconnect the door lamp cord from the lamp con nector 5 Remove the two 8 32 screws securing the door hinge to the dispenser housing 6 Carefully pull the door forward until the door support arms come completely out of the dispenser housing and set aside 7 Remove the six 8 32 truss head screws securing the rear cover to the dispenser housing 8 Remove the six 8 32 round head screws securing the front of the housing to the side panels 9 Remove the six 8 32 truss head screws securing the back of the housing to the side panels 10 Carefully lift and spread the housing to remove it from the rest of the dispenser Remove the door switch actuator from the nylon standoff 12 Noting the orientation of the door switch remove the two 6 32 screws and the nylon standoff securing the switch mounting bracket to the dispenser hous ing Remove the switch 13 Attach the new door switch taking care to orient the switch correctly inthe mounting bracketand secure in place with two 6 32 screws and nylon stand
26. e voltage across pins 2 amp 3 of the twelve connector on the wiring harness with a voltmeter Connect the dispenser to the power source and select the ON position of the main power switch The indication must be 24 volts ac 4 Select the OFF position of the main power switch and disconnect the dispenser from the power source If voltage is present as described proceed to 5 If voltage is not present as described refer to the wiring diagram and check the dispenser wiring harness 5 Reconnect the twelve pin connector to the control board J1 6 Disconnect the four pin connector J6 from the control board 7 Check the voltage across pins 1 positive amp 3 negative of the four pin connector on the control board with a voltmeter Connect the dispenser to the power source and select the ON position of the main power switch The indication must be 5 volts de 8 Select the OFF position of the main power switch and disconnect the dispenser from the power source If voltage is present as described proceed 9 If voltage is not present as described replace the control board 9 Reconnect the four pin connector to the control board J6 10 Check the voltage across pins 1 positive amp 3 nega tive of the four pin connector on the control board with a voltmeter Place full hopper in the dispenser connect the dispenser to the power source select the ON position on the
27. er Auto Fill door lamp flashes four times The ULTRA product tastes watery or sugary Powder Auto Fill dispenses dry product only dry powder build up in mixing and whipper chambers PROBABLE CAUSE 1 Powder Auto Fill not pulled com pletely forward 2 ULTRA level probe misaligned 1 Powder Auto Fill hopper not in stalled properly 1 Refill time exceeded five min utes 1 Improper adjustment of product mix ratio 1 Powder Auto Fill not connected to water source 2 Water source turned off 3 Water line obstructed REMEDY 1 Check that the Powder Auto Fill is pulled completely forward until the guide rails roll into the indented position 2 Position the ULTRA level probe so that it is located in the notch of the ULTRA hopper and touching the contact protruding from the front of the PAF platform 1 Properly position the Powder Auto Fill hopper Check that the SERVICE switch is released or reset by opening and closing the Powder Auto Fill door Adjust the product mix ratio per instructions in Powder Auto Fill Adjustment See page 5 1 Connect the Powder Auto Fill to a 20 to 90 psi 138 to 620 kPa water source 2 Turn water source on 3 Remove obstruction 41087 1 060112 TROUBLESHOOTING cont PROBLEM Powder Auto Fill will not dispense product Dripping from dispense tip Water flows continuously PROBABLE CAUSE 1 No water 2 No power or incorrect voltage
28. haft 13 by removing the retaining clip 6 from auger drive shaft Slide spacer 8 and auger drive shaft bracket 7 off of the auger drive shaft 13 Remove auger drive shaft 13 from hopper base 9 Wash components in a mild solution of dish de tergent using a bristle brush when needed 12 13 14 10 1 12 Rinse and dry each item thoroughly Check for damaged or broken components replace any if necessary and reassemble hopper assem bly Install hopper assembly in the dispenser by slid ing hopper assy on the hopper support plate 12 until the hopper base 9 seats firmly behind the retainer plates 16 on the hopper support plate 12 P1894 FIG 3 AUGER DRIVE amp HOPPER ASSEMBLY Hopper Lid 13 Auger Drive Shaft Hopper 14 Auger Wire Wiper Shaft 15 Ejector Elbow Wiper Blade 16 Hopper Retainer Plates Wiper Drive Gear 17 Auger Motor Bracket Auger Drive Bracket 18 Auger Motor Spacer 19 Dust Seal Hopper Base 20 Auger Motor Mounting Washer panel Retainer Ring 21 Slide gate Hopper Support Plate 41087 1 060112 SERVICE cont AUGER DRIVE MOTOR FIG 4 AUGER MOTOR Location The auger motor is located on the right rear of the motor assembly mounting panel Test procedures 1 Disconnect the dispenser from the power source 2 Check the voltage across the positive red wire terminal and the negative black wire terminal o
29. harness 5 Remove the two 6 32 keps nuts securing the transformer to the dispenser base Remove and discard the transformer 6 Install the new transformer on the dispenser base and secure with two 6 32 keps nuts 7 Connect the four pin connector on the transformer to the four pin plug on the main wiring harness 8 Reconnect the red black and green wires to the hopper switch See Fig 10 on page 17 9 Install the hopper support panel and secure with four 8 32 screws 10 Install the hopper assembly 41087 1 060112 SERVICE cont POTENTIOMETER P1931 Location The potentiometer is located under the hopper sup port panel mounted to the left of the whipper motor and mounted on a bracket Adjustments can be made by removing the 0 50 plug located on the whipper motor mounting panel Test Procedures 1 Disconnect the dispenser from the power source 2 Remove the six 8 32 screws securing the rear cover to the dispenser housing Disconnect the three pin connector J3 from the control board Check the resistance between pins 1 amp 3 of the potentiometer connector using an ohmmeter The indication must be between 800 and 1200 ohms 3 4 If the resistance measures as described proceed to 5 If resistance does not measure as described replace the potentiometer assembly 5 Adjust the potentiometer fully clockwise 6 Check resistance between pins 2 amp 3 of the potenti omete
30. he auger drive shaft by unscrewing the drive bracket from the auger drive shaft Wash components in a mild solution of dish deter gent using a bristle brush when needed Rinse and dry each item thoroughly before reas sembling NOTICE The cleaning instructions noted above are for nondairy sugar based food products When dispensing any other food product the cleaning cycle for the whipping chamber assembly and ejector elbow must be performed daily 6 41087 1 060112 FAULT LIST Door Lamp Fault ON Normal operation Powder Auto Fill ready to dispense Flashes ON OFF at 50 duty cycle Low product level in Powder Auto Fill hopper Two flashes about every 2 seconds ULTRA Powder Auto Fill probe circuit open Three flashes about every 2 seconds Powder Auto Fill hopper not in place Four flashes about every 2 seconds ULTRA refill exceeded 5 minutes OFF Door not closed REQUIRED REGULAR MAINTENANCE Semi Annual Bunn Kit 45319 0000 is required to perform the semi annual Preventive maintenance Note Service caused by failure to perform required maintenance is not covered by warranty Kit Contents Inventory this kit for completeness before proceeding Part Number Qty Description 25736 0000 1 Dispense Tip 25734 0000 1 Whipping Chamber 24733 0001 1 Mixing Chamber 28866 0000 1 Receptacle 26356 0000 1 Shaft Seal 24733 0010 1 O Ring 25902 0000 1 Frother 25903 0001 1 Ejector Elbow 41087 1 060112 T
31. ibed proceed to 17 If voltage is not present as described replace the control board 17 Check the photo LED forward and reverse bias us ing a diode tester The photo LED must be forward biased with positive applied to pin 1 of the two pin connector and negative applied to pin 2 of the two pin connector The photo LED must be reverse biased with negative applied to pin 1 of the two pin connector and positive applied to pin 2 of the two in connector If the photo LED biasing checks as described the low level detect circuitry is operating properly lf the photo LED biasing does not check as described replace the photo LED NOTE The photo LED lights in the infrared spectrum and is not visible to the human eye 41087 1 060112 SERVICE cont CONTROL BOARD and LEVEL PROBE cont Removal and Replacement 1 2 Disconnect the dispenser from the power source Remove the two plugs J1 and J7 from the main wiring harness the potentiometer plug J3 the photo transistor plug J6 and the photo LED plug J2 from the control board Remove the four 6 32 keps nuts securing the con trol board to the hopper motor mounting panel Remove the control board Remove the four spacers from the old control board and install them into the new control board Instal the new control board using the four 6 32 keps nuts Reconnect the two plugs J1 and 7 from the main wiring harness the potentiometer plug J3 the photo transisto
32. inuity should be present between center and upper terminals If continuity is present as described the main power switch is operating properly If continuity is not present as described replace the Switch Removal and Replacement 1 Disconnect the dispenser from the power source 2 Open the dispenser door and remove the hopper assembly out the front of the dispenser 3 Remove the four 8 32 screws securing the hopper Support panel to the auger motor mounting panel and the whipper motor mounting panel 4 Slowly liftthe hopper support panel up and discon nect the red black and green wires from the hopper switch 5 Remove the switch mounting nut on the front of the whipper motor mounting panel 6 Remove switch with wires attached from the rear of the whipper motor mounting panel 7 Remove the wires from the switch terminals and discard switch 8 Connect the wires to the new switch refer to Fig 16 9 Push new switch through hole in the whipper motor mounting panel and secure with face nut Connect the red black and green wires to the hopper switch See Fig 10 on page 17 Install the hopper support panel to the auger motor mounting panel and the whipper motor mounting panel using the four 8 32 screws 12 Install the hopper assembly 1 1 _ BLK from Power Cord BLK from Main Harness FIG 16 MAIN POWER ON OFF SWITCH TERMINALS 41087 1 060112 SERVICE cont LAMP CORD A
33. lamp ON and OFF and will stop dispensing product To clear the low product fault simply refill the powder as follows a Open the Powder Auto Fill door b Close the hopper slide gate c Remove the product hopper d Refill the product hopper with powdered granita mix Replace the hopper f Push the slide gate on the hopper ejector elbow to the OPEN position g Close the Powder Auto Fill door 41087 1 060112 adjust the Powder Auto Fill to produce the correct recipe 1 ADJUSTMENTS When using the Powder Auto Fill with a new powdered granita mix follow the procedure outlined below to Determine the mix ratio of powdered granita mix Convert the recipe so that it is expressed in terms of weight units grams 0 dry ounces 07 or pounds 105 of powdered granita mix to fluid ounces fl oz of water 1 gallon gal 128 fl oz 1 liter 1 33 8 02 The delivery rate of the water ingredient is factory preset to 1 fl oz per second Therefore it is only necessary to adjust the delivery rate of the pow dered granita mix Adjustment is accomplished as follows a Place the Powder Auto Fill on top of a fully as sembled ULTRA taking care to align the Powder Auto Fill guide rails over the rollers on the platform guide rails b Connect the Powder Auto Fill power cord to the outlet located on the ULTRA auger motor cover Attach a flexible water line to the 25 flare fitting on the back panel of the Powde
34. ltage is present as described proceed to 5 If voltage is not present as described refer to the wiring diagram and check the dispenser wiring harness 5 Reconnect the twelve pin connector to the control board J1 6 Disconnect the four pin connector J7 from the control board 7 Check the voltage across pins 1 amp 3 of the four pin connector on the wiring harness with a voltmeter Connect the dispenser to the power source and select the ON position of the main power switch The indication must be a 120 volts ac for 120 volt models b 230 volts ac for 230 volt CE models 8 Selectthe OFF position ofthe main power switch and disconnect the dispenser from the power source If voltage is present as described proceed to 9 If voltage is not present as described refer to the wiring diagram and check the dispenser wiring harness 9 Reconnectthe four pin connectorto the control board J7 10 Disconnect the twelve pin connector J1 from the control board 11 Measure the resistance between pins 8 amp 12 of the twelve pin connector on the wiring harness using an ohmmeter The indication must be between 298k ohms and 304k ohms If the resistance measures as described proceed to 12 If the resistance does not measure as described refer to the wiring diagram and check the dispenser wiring harness 12 Carefully connect a piece of insulated jumper wire to the level probe contact pin pink wire locate
35. mp holder socket assembly is located inside the dispenser door Test Procedures 1 Disconnect the lamp cord from the lamp cord connector 2 Remove the lamp from the lamp holder socket as sembly 3 Check the voltage across the two pin holes on the lamp holder socket assembly with a voltmeter and Day Night switch in the DAY position and the ON OFF switch in the ON position Verify that the dispenser hopper is full and in place the dispenser probe contact is making contact with the ULTRA liquid level probe and the dispenser door is closed Reconnect the lamp cord to the lamp cord connector The indication must be approximately 12 6 volts ac 4 Disconnect the lamp cord from the lamp cord connector If voltage is present as described the lamp holder socket assembly is operating properly If voltage is not present as described replace the lamp holder socket assembly 5 Check for continuity across the terminals on the lamps If continuity is present as described the lamp is op erating properly If continuity is not present as described replace the lamp Removal and Replacement 1 Disconnect the lamp cord assembly from the lamp cord connector assembly in the top of the dispenser 2 Remove the display graphic from the dispenser door 3 Open the dispenser door 4 Remove the five 6 32 screws securing the rear door cover to the door 5 Carefully lower the rear door cover and disconnect th
36. n the auger motor with a voltmeter With the dispenser door open and the productlevel in the ULTRA hopper lower than the probe press and hold the SERVICE Switch Connect the dispenser to the power supply The indication must be 4 0 to 26 5 volts dc If voltage is present as described the auger mo tor drive is operating properly If auger does not turn replace the auger motor If voltage is not present as described refer to wiring diagrams and check wiring harness 14 Removal and Replacement 1 Remove hopper assembly and set aside for reas sembly Remove six 8 32 screws securing the rear cover and remove the rear cover Remove the four 8 32 screws located inside the dispenser housing on the lower right front of the auger motor mounting panel securing the auger motor mounting bracket and auger motor to the rear of the auger motor mounting panel Disconnect the wires from the auger drive motor Remove the auger motor mounting bracket auger motor and dust seal as an assembly Remove the dust seal from the auger motor and discard the motor Install dust seal on the new auger motor shaft and align the notch in the seal with the motor casting Connect the wires from the auger motor to the terminals in the main wiring harness See Fig 5 Using four 8 32 screws install the auger motor dust seal and mounting bracket to the rear of the auger motor mounting panel 10 Install the hopper assembly 11 Install the rear cove
37. ng from the inlet port of the needle valve 7 Install the fitting removed from the old needle valve onto the new needle valve using pipe thread sealant BOM M2526 0000 8 Attachthe needle valve to the fitting on the dispense solenoid valve using pipe thread sealant BOM M2526 0000 and tighten securely 9 Install the solenoid valve and needle valve as de scribed in section Dispense Solenoid Valve 10 Attach water inlet and outlet lines and tighten se curely 11 Connect the dispenser to the water source and check for leaks Tighten any leaking connections before installing rear panel 41087 1 060112 SERVICE cont DISPENSE SOLENOID VALVE FIG 33 DISPENSE SOLENOID VALVE Location The dispense solenoid valve is located on the left side of the dispenser base inside of the rear cover Test Procedures 1 Disconnect the dispenser from the power source 2 Disconnect the white red and white brown wires from the solenoid valve 3 Check the voltage across the white red and white brown wires with a voltmeter Connectthe dispenser to the power source The indication must be a 120 volts ac for 120 volt models b 230 volts ac for 230 volt CE models 4 Disconnect the dispenser from the power source If voltage is present as described proceed to 5 If voltage is not present as described refer to wiring diagrams and check the dispenser wiring harness 5 Check for continuity across the solenoid
38. off Reconnect the wires to the door switch Refer to Fig 31 Install the door switch actuator orienting the notched side against the right side housing panel Refer to Fig 30 16 Reassemble the dispenser top housing rear panel and door assembly to the dispenser _ _ A ORA to Control Board J1 9 GRN to Control Board J1 8 FIG 31 DOOR SWITCH TERMINALS 31 41087 1 060112 SERVICE PRESSURE REGULATOR and NEEDLE VALVE FIG 32 PRESSURE REGULATOR and NEEDLE VALVE Location The pressure regulator and needle valve are located inside the rear panel at the bottom of the dispenser Adjustments The water pressure regulator is preset at the factory to produce 15 psi 103 kPa of water pressure at the regulator outlet with inlet pressures ranging from 20 psi to 90 psi 138 to 620 kPa No field adjustments of the pressure regulator should ever be necessary The needle valve is preset at the factory to dispense 1 fluid ounce of water per second The dispenser is designed to accommodate various product mix ratios by adjusting the product dispense rate see Initial Setup Should a readjustment of the water dispense rate become necessary proceed as follows 1 Disconnect the dispenser from the power source 2 Remove the six 8 32 screws securing the rear panel to the dispenser housing 3 Turn the needle valve adjustment screw coun terclockwise to increa
39. pin 2 black of the lamp cord connector plug and the lamp cord connector body Check for continuity between pins 1 amp 2 of the lamp cord connector plug Continu ity must not be present between pins 1 amp 2 24 If continuity is present as described the lamp cord connector is operating properly If continuity is not present as described replace the lamp cord connector Removal and Replacement 1 Disconnectthe lamp cord assembly from the lamp cord connector 2 Remove the six 8 32 screws securing the rear cover to the dispenser 3 Disconnect the lamp cord connector wires from the dispenser main wiring harness 4 Remove nut and washer securing the lamp cord connector to the dispenser Remove and set aside the insulating washers and discard nut washer and lamp cord connector 5 Remove new nut and washer from new lamp cord connector 6 Install the insulating washers to the hole in the top of the dispenser Push new lamp cord connector through the holes in the insulating washers and secure with the new nut and washer 7 Reconnect the wires on the cord connector to the dispenser main wiring harness 8 Connect the lamp cord to the lamp cord connec tor 9 Install the rear cover to the dispenser and secure with six 8 32 screws To Main Harness FIG 20 LAMP CORD CONNECTOR 41087 1 060112 SERVICE cont LAMP HOLDER SOCKET ASSEMBLY FIG 21 LAMP HOLDER SOCKET ASSEMBLY Location The la
40. pper support panel up and discon nect the red black and green wires from the hopper switch 5 Remove the facenut securing the TEST SERVICE switch the whipper motor mounting panel 6 Remove switch with wires attached from the back side of the whipper motor mounting panel 7 Disconnect the wires from the switch and discard the switch 8 Refer to Fig 14 when connecting the wires to the new switch 9 Install new switch with wires attached through the hole the whipper mounting panel and secure with facenut 10 Connectthe red black and green wires to the hopper switch See Fig 10 on page 17 11 Install the hopper support panel to the auger motor mounting panel and the whipper motor mounting panel using the four 8 32 screws 12 Install the hopper assembly WHI ORN from Control Board J1 6 GRN from Control Board J1 8 BLU BLK from Control Board J1 11 FIG 14 TEST SERVICE SWITCH TERMINALS 41087 1 060112 SERVICE cont MAIN POWER ON OFF SWITCH P1923 FIG 15 MAIN POWER ON OFF SWITCH Location The main power switch is located inside the dis penser on the right of the whipper motor mounting panel Test Procedure 1 Disconnect the dispenser from the power source 2 Disconnect the black wires from the main wiring harness 3 With the switch in the ON lower position check for continuity between the center and the upper terminal With the switch in the OFF upper posi tion no cont
41. proceed to 4 4 Disconnect the twelve pin connector J1 from the control board 5 Check continuity between pins 8 amp 10 onthe harness using an ohmmeter Continuity must be present when the hopper is correctly installed Continuity must not be present when the hopper is removed 6 Reconnectthe twelve pin connector J1 tothe control board If continuity is present as described the hopper switch is operating properly If continuity is not present as described proceed to 7 30 7 Disconnect the wires from the hopper switch 8 Check continuity between the and COM ter minals of the hopper switch using an ohmmeter Continuity must be present when the actuator is engaged Continuity must not be present when actuator is released lf continuity is present as described refer to wiring diagram and check the dispenser wiring harness If continuity is not present as described replace the hopper switch Removal and Replacement 1 Disconnect the dispenser from the power source 2 Open the dispenser door and remove the hopper 3 Remove the four 8 32 screws securing the hopper Support panel 4 Carefully lift the hopper support panel remove the wires from the hopper switch and remove the hopper support panel 5 Noting the orientation of the switch remove the two 4 40 screws lockwashers and nuts securing the switch to the panel 6 Attach the new switch to the panel taking care to orient it properly and
42. r Auto Fill i Remove the hole plug onthe whipper panel Using a screwdriver set potentiometer to approximately mid range j Remove the mixing chamber from the Powder Auto Fill and place a small container such as under the product hopper ejector elbow k Push the slide gate on the product hopper ejector elbow to the OPEN position 1 Momentarily set the TEST SERVICE switch on the whipper panel to the TEST position m The hopper motor will run and dispense pow dered granita mix for 10 seconds n After the Powder Auto Fill has finished the 10 second throw test weigh the dispensed product 0 Determine the dispense rate of the powdered product weight units per second by dividing the measured weight by 10 p Compare the measured dispense rate with the mix ratio in step 1 q Adjustthe MIN MAX control clockwise to increase NOTE A water strainer assembly BUNN O MATIC 23820 1000 should be installed in line prior to the flexible water line the dispense rate or counterclockwise to decrease the dispense rate of the powdered granita mix Repeat steps through q as necessary until proper d On the ULTRA touch pad make the following settings i POWER ON ii DAY NIGHT DAY e Pull the Powder Auto Fill fully forward on its support rails f Fill the Powder Auto Fill product hopper as fol lows i Pull the slide gate closed on the Powder Auto Fill product hopper elbow and remove the produc
43. r connector with an ohmmeter The indication must be between 800 and 1200 ohms Check the resistance between pins 1 amp 2 of the potentiometer connector with an ohmmeter The indication must be less than 20 ohms 28 If the resistance measures as described proceed to 7 If resistance does not measure as described replace the potentiometer assembly 7 8 Adjust the potentiometer fully counterclockwise Check resistance between pins 1 amp 2 of the potenti ometer connector with ohmmeter The indication must be between 800 and 1200 ohms Check the resistance between pins 2 amp 3 of the potentiometer connector with an ohmmeter The indication must be less than 20 ohms the resistance measures as described the potenti ometer is operating properly If resistance does not measure as described replace the potentiometer assembly Removal and Replacement 1 Disconnect the dispenser from the power source 2 Remove the six 8 32 screws securing the rear panel to the dispenser Disconnect the three pin connector J3 from the control board Open the dispenser door and remove the 8 32 screw securing the potentiometer mounting bracket to the whipper motor mounting panel Remove the potentiometer and mounting bracket as an assembly Remove the facenut and locking washer securing the potentiometer to the bracket Install the new potentiometer to the mounting bracket using the locking washer and facenut Install
44. r plug J6 and the photo LED plug J2 to the control board Refer to Fig 12 20 FIG 12 CONTROL BOARD WIRING 41087 1 060112 SERVICE cont TEST SERVICE SWITCH FIG 13 TEST SERVICE SWITCH Location The TEST SERVICE switch is located on the left front of the whipper motor mounting panel Test Procedure 1 Disconnect the dispenser from the power source 2 Disconnect the wires from the switch terminals 3 Check for continuity between the center terminal and upper terminal with switch in the SERVICE position lower Check for continuity between the center terminal and the lower terminal with the switch in the TEST position upper Continu ity must not be present when the switch is in the center position If continuity is present as described the switch is Operating properly If continuity is not present as described replace the switch Removal and Replacement 1 Disconnect the dispenser from the power source 2 Open the dispenser door and remove the hopper assembly out the front of the dispenser 3 Remove the four 8 32 screws securing the hopper support panel to the auger motor mounting panel and the whipper motor mounting panel 4 Slowly liftthe ho
45. r with six 8 32 screws RED to Control Board J1 1 BLK to GRN Wire Main Harness to Control Board J1 7 FIG 5 AUGER MOTOR TERMINALS 41087 1 060112 SERVICE cont FROTHER AND MIXING WHIPPER CHAMBER FIG 6 FROTHER AND MIXING WHIPPER CHAMBER Location The frother is located behind the dispenser door mounted on the front panel and inside the whipper chamber Removal Cleaning and Replacement 1 Disconnect the dispenser from the power source 2 Open the dispenser door and lift the front edge of the hopper over the retainer plates on the hopper support panel and slide the hopper assembly out the front of the dispenser Pull the mixing chamber 1 out of the whipper chamber 3 Remove the dispense tip 2 and twist the whipper chamber 3 clockwise and pull it off the whipper chamber receptacle 6 Pull the frother 5 off the motor shaft Notice the flat side on the shaft and the matching flat inside the frother It is important that these two flats are lined up when reassembling Slip the O ring 4 off the whipper chamber recep tacle 6 Remove the receptacle by rotating clockwise until the receptacle clears the nuts 7 and slide off the motor shaft Wash components in mild solution of dish deter gent using a bristle brush Rinse thoroughly and allow to dry before reinstalling in the dispenser 10 Slide whipper chamber receptacle
46. se port is pointing down WHI RED to Control Board J7 2 WHI BRN to Control Board J7 4 FIG 9 WHIPPER MOTOR TERMINALS 21 22 23 Install dispense tip into the bottom of the whipper chamber Slip the mixing chamber onto the mixing chamber water inlet tube far enough so the mixing chamber will seat inside the whipper chamber Install hopper assembly in the dispenser by slid ing hopper assembly on the hopper support panel until the slot in the bottom rear of the hopper seats against the pin and retainer plates on the hopper Support panel GRN to Control Boad J1 8 RED BLK to Control Board J1 10 FIG 10 HOPPER SWITCH TERMINALS 41087 1 060112 SERVICE CONTROL BOARD and LEVEL PROBE a vo 2 ay FIG 11 CONTROL BOARD Location The control board is located behind the rear panel mounted on the back side of the hopper motor mount ing panel Test Procedure Liquid Level Control 1 Disconnect the dispenser from the power source 2 Disconnect the twelve pin connector J1 from the control board Checkthe voltage across pins 2 amp 3 of the twelve connector on the wiring harness with a voltmeter Connect the dispenser to the power source and select the ON position of the main power switch The indication must be 24 volts ac 4 Select the OFF position of the main power switch and disconnect the dispenser from the power source If vo
47. se the water flow rate and clockwise to decrease the water flow rate Removal and Replacement Pressure Regulator 1 Disconnect the dispenser from the power source and the water supply 2 Remove the six 8 32 screws securing the rear panel to the dispenser housing 3 Disconnect the 25 copper tube from the outlet of the pressure regulator 4 Loosen the nut securing the bulkhead fitting to the dispenser 5 Remove the bulkhead fitting from the inlet to the pressure regulator 6 Remove the pressure regulator assembly 7 Attach the regulator to the bulkhead fitting making sure that the copper bushing is seated properly in the regulator and tighten securely 8 Tighten the nut securing the bulkhead fitting to the dispenser housing 9 Attach the 25 copper tube to the regulator as sembly and tighten securely 10 Connect the dispenser to the water source and check for leaks Tighten any leaking connections before installing rear panel Removal and Replacement Needle Valve 1 Disconnect the dispenser from the power source and the water supply 2 Remove the six 8 32 screws securing the rear panel to the dispenser housing Disconnect the 25 copper tube from the inlet fit ting on the needle valve 4 Disconnect the water outlet from the solenoid valve 5 Remove the solenoid valve and needle valve as described in section Dispense Solenoid Valve 6 Remove the needle valve assembly Remove the fitti
48. t hopper from the Powder Auto Fill ii Remove the lid from the product hopper and fill the hopper with a powdered granita mix iii Install the product hopper into the Powder Auto Fill g Place the ON OFF switch at the Powder Auto Fill whipper panel to ON h After allowing 5 seconds for the Powder Auto Fill to initialize observe the door lamp on the whipper panel The door lamp should not be lit If the door lamp is lit consult the fault list and clear the fault before proceeding mix ratio is achieved 5 Replace the mixing chamber removed in step j Replace hole plug Once the mix ratio has been adjusted the Powder Auto Fill can be run with the door open to allow the user to catch dispensed product for brix testing as follows a Hold a container under the dispense tip of the Powder Auto Fill b Hold the TEST SERVICE switch on the whipper panel to the SERVICE position c When the container is filled to the desired level release the TEST SERVICE switch d Measure the brix using the appropriate measur ing device Remove the hole plug Using a screwdriver adjust the potentiometer clockwise to increase the brix or counterclockwise to decrease the brix of the product Replace the hole plug 41087 1 060112 CLEANING RECOMMENDED DAILY CLEANING AND MAINTENANCE TIPS This should be done in conjunction with the recommended weekly cleaning of your ULTRA 2 machine Removing and cleaning the whipper chamber
49. t no charge replacement parts and or labor during the applicable parts and labor warranty periods specified above to repair the defective components provided that this repair is done by a BUNN Authorized Service Representative or 2 shall replace the equipment or refund the purchase price for the equipment THE BUYER S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF THIS EQUIPMENT WHETHER DERIVED FROM WARRANTY OR OTHERWISE SHALL BE LIMITED AT BUNN S SOLE OPTION AS SPECIFIED HEREIN TO REPAIR REPLACEMENT OR REFUND In no event shall BUNN be liable for any other damage or loss including but not limited to lost profits lost sales loss of use of equipment claims of Buyer s customers cost of capital cost of down time cost of substitute equipment facilities or services or any other special incidental or consequential damages 392 AutoPOD AXIOM BrewLOGIC BrewMETER Brew Better Not Bitter BrewWISE BrewWIZARD BUNN Espress BUNN Family Gourmet BUNN Gourmet BUNN Pour O Matic BUNN BUNN with the stylized red line BUNNlink Bunn OMatic Bunn O Matic BUNNserve BUNNSERVE with the stylized wrench design Cool Froth DBC Dr Brew stylized Dr design Dual Easy Pour EasyClear EasyGard FlavorGard Gourmet Ice Gourmet Juice High Intensity iMIX Infusion Series In tellisteam My Caf Phase Brew PowerLogic Quality Beverage Equipment Worldwide Respect Earth Respect Earth with the stylized leaf
50. the lamp cord to the lamp cord connector The indication must be approximately 12 volts ac 4 Disconnect the lamp cord from the lamp cord connector If voltage is present as described the LED board is faulty If voltage is not present as described retrace the wiring circuit to find the fault 5 Check for continuity across the terminals on the leads and the LED harness If continuity is present as described the lamp is op erating properly If continuity is not present as described replace the lamp Removal and Replacement 1 Disconnect the lamp cord assembly from the lamp cord connector assembly in the top of the dispenser 2 Remove the display graphic from the dispenser door 3 Open the dispenser door 4 Remove the five 6 32 screws securing the rear door cover to the door 5 Carefully lower the rear door cover and disconnect the LED board leads from the lamp cord termi nals 6 Remove and discard the faulty LED board 7 Install a new LED board exposing the adhesive backing 8 Refer to Fig 24 and reconnect wires to the LED board 9 Connect the leads to the lamp cord assembly and replace the rear door cover 10 Close the dispenser door 11 Plug in the lamp cord assembly to the lamp cord connector assembly on top of the dispenser to BLK at Lamp Cord FIG 24 LED DOOR LIGHT WIRING 41087 1 060112 SERVICE cont TRANSFORMER Location The transformer is loc
51. to the dispenser 3 Dispense Solenoid Valve 4 Control Board and Probe 5 Auger Drive 6 Transformer 7 Water Strainer Optional 1 Dispense Solenoid Valve 1 Control Board and Probe 2 Dispense Solenoid Valve REMEDY Water lines and valves to the dis penser must be open and free of obstructions Check that the power cord is con nected to the ULTRA dispenser and for voltage from the ULTRA dispenser Refer to Service Dispense Solenoid Valve for testing procedures See page 32 Refer to Service Control Board and Probe for testing procedures See page 18 Refer to Service Auger Drive for testing procedures See page 13 Refer to Service Transformer for testing procedures See page 26 A Direction of flow arrow must be pointing towards dispenser Remove the strainer and check for obstructions Clear or replace Remove dispense valve and clear any obstructions Rebuild or replace the valve if necessary See page 32 Refer to Service Control Board and Probe for testing procedures See page 18 Refer to Service Dispense Solenoid Valve for testing procedures See page 32 41087 1 060112 TROUBLESHOOTING cont PROBLEM Product overflows ULTRA hopper Weak product Dispenser is making unusual nois es Display not lit PROBABLE CAUSE 1 Control Board and Probe 2 Dispense Solenoid Valve 1 Whipper Motor 2 Frother 3 Dispense Solenoid Valve 4 Auger Drive 5 Auger
52. with seal 6 and O ring 4 on to the motor shaft Rotate the receptacle with seal 6 counterclockwise until it snaps into place on the motor mounting nuts 7 Push frother 5 onto the motor shaft making sure the flat in the frother 5 lines up with the flat on the motor shaft Install whipper chamber 3 onthe whipper chamber receptacle 6 by twisting counterclockwise until tabs on the whipper chamber 3 lock with the tabs on the whipper chamber receptacle 6 Be sure dispense port is pointing down Install dispense tip 2 into the bottom of the whip per chamber 3 Slip the mixing chamber 1 onto the mixing chamber water inlet tube far enough so the mixing chamber 1 will seat inside the whipper chamber 3 Install hopper assembly in the dispenser by slid ing hopper firmly behind the retainer plates on the hopper support panel 11 14 13 14 15 16 9 8 7 6 5 4 1895 FIG 7 MIXING WHIPPER CHAMBER COMPONENTS 1 Mixing Chamber 6 Receptacle w Seal 2 Dispense Tip 7 Nut 3 Whipper Chamber 8 Slinger 4 O Ring 9 Motor Assembly 5 Frother 41087 1 060112 SERVICE cont WHIPPER MOTOR Tet FIG 8 WHIPPER MOTOR Location The whipper motor is located on the back side of the whipper motor mounting panel Test Procedure 1 Disconnect the dispenser from the power source 2 Disconnect the white red and white brown wires of the main wiring harness from the bla

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41087.0001

41087.0001

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