Bunn 41722.0000A Coffeemaker User Manual
Contents
1. FIG 19 1 BREW DILUTION TIMER TRIACS Triacs TH 1 MV 1 Brew solenoid TH 2 MV 2 Dilution solenoid 41722 070209 Page 19 SERVICE cont DIGITAL BREW TIMER amp TB6Q p FIG 20 1 DIGITAL TIMER Location The timer is located in left side of the hood Test Procedure NOTE Do not remove or install wires while timer board is installed Pressure applied to one side may cause damage to the board 1 Disconnectthe brewer from the power source and remove the top cover 2 With a voltmeter check the supply voltage across terminals TL1 and TL2 Connect the brewer to the power source Turn on the ON OFF switch The voltage must be a 120 volts ac for two wire 120 volt models b 200 to 230 volts ac on two wire 200 volt or 230 volt models 3 Disconnect the brewer from the power source If voltage is present as described proceed to 4 If voltage is not present as described refer to the Wir ing Diagrams and check the wiring harness 4 With a voltmeter check the output voltage across terminals TL1 and TL4 Connect the brewer to the power source turn on the ON OFF switch and press the START switch The voltage must be a 120 volts ac for two wire 120 volt models b 200 to 230 volts ac for two wire 200 volt or 230 volt models If voltage is present as described the timer is operat ing properly If voltage is not present as described proceed to 5 5 With a2. WHI WHI RED BREW DILUTION TIMER 654321 WHI VIO DILUTION WHI VIO WHI BLU ight 54 2 1 1 START an WHI ORN SWITCH i WHIYEL 0c 230 VOLTS 2 WIRE SINGLE PHASE 37234 0011A 10 08 2008 BUNN O MATIC CORPORATION Page 25 41722 070209 SCHEMATIC WIRING DIAGRAM TB6 GRN OPTIONAL ae ae Chassis Ground BLU Earth Ground L1 N THERMOSTAT THERMOSTA r1 BLU BLK e 9 BLK WHI XML ME TANK HEATER WHI e KEEP WARM HEATER START SWITCH e e e e SWIA SW1C I F i WHI TIMER He WHI GRN gp WHI YEL er WHI BLU BREW Lippen YEL DT 120 VOLTS AC DILUTION 2 WIRE SINGLE PHASE Page 26 41974 0000A 03 09 2009 BUNN O MATIC CORPORATION SCHEMATIC WIRING DIAGRAM TB6Q GRN OPTIONAL READY 2 Chassis Ground Earth Ground BLU 9 LIMIT THERMOSTAT e THERMOSTA eer BLK re BLU BLK wi Pn WHle 5 WHI KEEP W
3. BUNN 117 1830 TB3Q LP TB6 TB6Q STARTING WITH SERIAL NUMBER TU00020000 SERVICE amp REPAIR MANUAL BUNN O MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD ILLINOIS 62708 3227 PHONE 217 529 6601 FAX 217 529 6644 www bunn com LS 41722 0000A 07 09 2009 Bunn O Matic Corporation BUNN 0 MATIC COMMERCIAL PRODUCT WARRANTY Bunn O Matic Corp BUNN warrants equipment manufactured by it as follows 1 All equipment other than as specified below 2 years parts and 1 year labor 2 Electronic circuit and or control boards parts and labor for 3 years 3 Compressors on refrigeration equipment 5 years parts and 1 year labor 4 Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis parts and labor for 3 years or 30 000 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 by BUNN or that in BUNN s judgment has been affected by misuse neglect alteration improper installation or operation improper maintenance or repair damage or casualty This warranty is conditioned on the Buyer
4. DILUTION OPTIONAL 1 READY WHIWIO WHI BLU BLU BLK4 50 H BLK WHIWIO WHI GRN START WHI ORN L SWITCH 100 VOLTS AC 120 VOLTS AC 2 WIRE GND SINGLE PHASE 37234 0008B 10 08 2008 BUNN O MATIC CORPORATION SCHEMATIC WIRING DIAGRAM TB3Q POWER CORD GRN Li LIMIT Earth Ground SWITCH amp Chassis Ground N THERMOSTAT OPTIONAL READY 120 VOLTS AC 2 WIRE SINGLE PHASE 37234 0009B 06 08 2008 0 CORPORATION 41722 070209 Page 24 SCHEMATIC WIRING DIAGRAM TB3Q W SWEETENER amp EMPTY BAG DETECT L1 GREEN N LIMIT IHERMOSTAT L THERMOSTAT i eer 4 ei BLUIBLK ie o WHI wi KEEP WARN HEATER TT LOW PRESSURE SWITCH WHI VIO COM whi RELAY UNSWEET OFF SWEET ETE WHI WHI VIO j D D BLK i 2 WHI gt SOLD OUT INDICATOR 7 mE WHI VIO 15 BLK PO ack ann Lanne ZZ ZZ 1 b co START WHI BLK BREW 247 WHI ORA zL TIMER 4 50 WHI YEL ep WHI VIO 200 SWINR WHI GRN WHVBLU 120 VOLTS AC 2 WIRE 37234 0010A 04 08 2008 BUNN O MATIC CORPORATION SINGLE PHASE SCHEMATIC WIRING DIAGRAM TB3A OPTIONAL Earth Ground READY INDICATO BLU j 45 1 BLK L1 N SWITCH LIMIT THERMAL Chassis Ground THERMAL THERMOSTA THERMOSTAT FUSE FUSE e BLK 1 ee 1 1 eS e e 4 3
5. estate dee e 4 14085855 t lebt 10 THE MMO ede 10 Limit Th rmostat 25255 8 tad 12 Tank Heater cem 13 14 Non Lighted ON OFF 15 21811501 189552 16 tile Soleil dS cde 17 Dal Timer TB TEE 18 Digital Timer BOG te 20 Schematic Wiring 5 ta 22 Page 3 41722 070209 TROUBLESHOOTING 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
6. 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 Make certain that all plumbing connections are sealed and electrical connections tight and isolated This brewer is heated at all times Keep away from combustibles WARNING Exercise extreme caution when servicing electrical equipment Unplug the brewer when servicing except when electrical tests are specified Follow recommended service procedures Replace all protective shields or safety notices PROBLEM PROBABLE CAUSE REMEDY Brew cycle will not start 1 No water Water lines and valves to the brewer must be open 2 No power or incorrect voltage A1 Check the wire crimps for to the brewer 120 volts across the black and white terminals on two wire 120 volt brewers A2 Check the wire crimps for 200 volts on Series brewers or 230 volts on A Series brew ers across the red and black terminals B Check circuit breakers or fuses 41722 070209 Page 4 TROUBLESHOOTING cont PROBLEM Brew cycle will not start cont Water is not hot PROBABLE CAUSE 3 ON
7. OFF Switch 4 Start Switch 5 Timer 6 Solenoid Valve 7 Water strainer flow control If equipped 1 A Limit Thermostat B Thermal Cut Off 230V CAUTION Do not eliminate or bypass limit thermostat or thermal cut off Use only BOM replacement parts 2 Control Thermostat 3 Tank Heater Page 5 REMEDY Refer to Service ON OFF Switch for testing Refer to Service Start Switch for testing procedures Refer to Service Timer for test ing procedures Refer to Service Solenoid Valve for testing procedures A Direction of flow arrow must be pointing towards brewer B Remove the strainer flow control and check for obstruc tions Clear or replace Refer to Service Limit Ther mostat for testing procedures Thermal Cut Off for testing procedures Refer to Service Control Ther mostat for testing procedures Refer to Service Tank Heater for testing procedures 41722 070209 TROUBLESHOOTING cont PROBLEM Inconsistent beverage level in dispenser Consistently low beverage level in the dispenser Spitting or excessive steaming PROBABLE CAUSE 1 Strainer flow control If equipped 2 Syphon System 3 Lime Build up CAUTION Tank and tank com ponents should be delimed regularly depending on local water conditions Excessive min eral build up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks 4 Water Pressure 1
8. Timer 2 Strainer flow Control If equipped 1 Lime Build up CAUTION Tank and tank com ponents should be delimed regularly depending on local water conditions Excessive min eral build up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks Page 6 REMEDY A Direction of flow arrow must be pointing towards the brewer B Remove the strainer flow control and check for obstruc tion Clear or replace The brewer must be level or slightly lower in front to syphon properly Inspect the tank assembly for excessive lime deposits Delime as required The water pressure to the brewer must be at least 20 psi 138kPa and minimum 1 0 gpm flow rate Timer dial must indicate at least two minutes and fifteen seconds Refer to Operating Manual A Direction of flow arrow must be pointing towards brewer B Remove the strainer flow control and check for obstruc tions Clear or replace Inspect tank assembly for exces sive lime deposits Delime as required 41722 070209 TROUBLESHOOTING cont PROBLEM Spitting or excessive steaming cont Dripping from sprayhead Water flows into tank continu ously ON OFF Switch ON Water flows into tank continu ously ON OFF Switch Beverage overflows dispenser PROBABLE CAUSE 2 Control Thermostat 1 Syphon System 2 Lime Build up CAUTION Tank and tank com ponents should be delimed regular
9. the component bracket 7 Securely fasten the water lines to and from the solenoid valve 8 Refer to schematics when reconnecting the wires 41722 070209 SERVICE cont BREW DILUTION TIMER TB3 amp TB6 FIG 18 1 BREW DILUTION TIMER 2 Location The timer is located in left side of the hood Test Procedure NOTE Do remove or install wires while timer board is installed Pressure applied to one side may cause damage to the board 1 Disconnect the brewer from the power source and remove the top cover 2 With a voltmeter check the supply voltage across terminals TL1 and TL2 Connect the brewer to the power source Turn on the ON OFF switch The voltage must be 120 volts ac for two wire 120 volt models b 200 to 230 volts ac on two wire 200 volt or 230 volt models 3 Disconnect the brewer from the power source If voltage is present as described proceed to 4 If voltage is not present as described refer to the Wir ing Diagrams and check the wiring harness 4 With a voltmeter check the BREW output voltage across terminals TL2 and TL4 and the DILUTION output voltage across terminals TL2 and TL6 Connect the brewer to the power source turn on the ON OFF switch and press the START switch The voltage must be a 120 volts ac for two wire 120 volt models b 200 to 230 volts ac for two wire 200 volt or 230 volt models Page 18 If voltage is present as described the t
10. voltmeter check the input start voltage across terminals TL2 and TL5 Connect the brewer Page 20 to the power source turn on the ON OFF switch and press the START switch The indication must be as follows a 120 volts ac for two wire 120 volt models b 200 to 230 volts ac on two wire 200 volt or 230 volt models If voltage is not present as described refer to the Wiring Diagrams and check the wiring harness to the start switch If start voltage is present as described but no output voltage replace the timer Removal and Replacement 1 Remove the two 6 32 screws lock washers and spacers securing timer to bracket 2 Disconnect all wires from the timer 3 Refer to schematic and reconnect wires 4 Install new timer to bracket with the two 26 32 screws lock washers and spacers 5 Adjust the timer as required FIG 20 2 DIGITAL TIMER Terminals 2 batch connector 9 1 Multi batch NOT USED TB SERIES SW 1 Programming Enable Disable TRM 1 White Violet 11 from ON OFF switch TRM 2 White Red Neutral L2 TRM 3 White Orange Start switch TRM 4 White Green Brew solenoid TRM 5 White Yellow Start switch 41722 070209 SERVICE cont DIGITAL BREW TB3Q amp TB6Q SET LOCK hk x gee en 9ILVN O NNn8 IE APR RTI ARR LL EM GI MOV2 FIG 21 1 DIGITAL TIMER TRIACS Triacs Q 1 MV 2 Brew solenoid out
11. 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 EXPRESS 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 its sole discretion that the equipment does not conform to the warranty BUNN at its exclusive option while the equipment is under warranty shall either 1 provide at 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
12. ARM HEATER BLK LEFT OFE RIGHT SWITCH START SWITCH 1 E 1 uo xg NN XA 1 SW1A SW2A WHI VIO ME WHI TIMER WHI GRN WHI YEL MORE BREW YEL LEFT RIGHT 120 VOLTS AC DILUTION 2 WIRE 41975 0000A 03 09 2009 BUNN O MATIC CORPORATION SINGLE PHASE 41722 070209 Page 27
13. 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 BrewWISE BrewLOGIC BrewMETER BrewWIZARD Bunn Gourmet BUNN Gourmet Ice BUNN Pour O Matic BUNN Bunn OMatic Bunn O Matic BUNNlink BUNNserve BUNNSERVE BUNN Espress Cool Froth DBC Dr Brew Dual EasyClear EasyGard Easy Pour FlavorGard Gourmet Ice Gourmet Juice High Intensity IMIX In fusion Series Intellisteam Quality Beverage Equipment Worldwide The Mark of Quality in Beverage Equipment Worldwide My Caf PowerLogic Safety Fresh Scale Pro Silver Series Single Smart Funnel Smart Hopper SmartWAVE Soft Heat SplashGard System ThermoFresh 392 AutoPOD AXIOM Beverage Profit Calcula tor Beverage Bar Creator BUNNsource Coffee At Its Best Digital Brewer Control Nothing Brews Like a BUNN Pouring Profits Pulse Wave Signature Series Smart Heat Tea At Its Best The Horizontal Red Line Titan Ultra are either trademarks or registered trademarks of Bunn O Matic Corporation 41722 012609 Page 2 Contents Trouble Shooting
14. and grommet from the tank 7 Check the voltage across the black wire of the control thermostat and the white wire on the tank heater 120V models or red wire on the tank heater on two wire 200V or 230V models with a voltmeter when the control thermostat is turned fully clockwise Connect the brewer to the power CONTINUED 41722 070209 SERVICE cont CONTROL THERMOSTAT cont 8 source The indication must be a 120 volts ac for two wire 120 volt models b 200 to 230 volts ac for two wire 200 volt or 230 volt models Disconnect the brewer from the power source If voltage is presentas described reinstall the capillary tube into the tank to the line 4 5 above the bulb the control thermostat is operating properly If voltage is not present as described replace the thermostat Removal and Replacement T 2 Disconnect the control thermostat wires Remove the thermostat capillary bulb by firmly pulling up on the capillary at the tank lid This will disengage the grommet from the tank lid Remove the one 76 32 screw securing the control thermostat to the component bracket inside the hood Slide the grommet to the line 4 5 above the bulb on the new capillary tube Insert the capillary bulb through the hole in the tank lid and press the grommet firmly and evenly sothatthe groove in the grommet fits into the tank lid Carefully bend the capillary tube so that the tube and bulb inside the tank are in the v
15. as described replace the switch NOTE No continuity will show across the upper left terminals of the lighted switch since the light is neon Page 14 Removal and Replacement 1 Remove the wires from the switch terminals 2 Compress the clips inside the hood and gently push the switch through the opening Push the new switch into the opening and spread the clips to hold the switch captive in the hood 4 Refer to FIG 14 2 when reconnecting the wires BLACK WHITE WHT VIO P N 37080 0000 2 WHT VIO FIG 14 2 LIGHTED ON OFF SWITCH TERMINALS 41722 070209 SERVICE cont ON OFF SWITCH TB6 Q Sweetner Batch Option TB3 Q WHI VIO Optional AE P N 03356 0003 Ve batch Non Lighted M Ve batch FIG 15 1 NON LIGHTED ON OFF SWITCH Location The switch is located on the front control panel Test Procedure 1 Disconnect the brewer from the power source Re 1 2 Disconnect the wires from switch terminals BRN WHI 3 Check for continuity across the center and right z and across center and left terminals in rows one 7 4 __ WHI GRN through four when the switch is in the oposite lt position If continuity is not present as described replace the WHI VIO UNSWEET OFF SWEET TB3 TB3Q If continuity is present as described replace the wires w SWEETENER amp EMPTY DETECT the switch is operating properly Removal and Replacement 1 Remove the wires
16. ertical posi tion NOTE Thecapillary tube must be clear of any electri cal termination and not kinked 7 Using one 76 32 screw secure the control thermo stat to the component bracket inside the hood 8 Adjust the control thermostat as required Page 11 FIG 11 1 CONTROL THERMOSTAT TERMINALS FIG 11 2 REPLACEMENT CONTROL THERMOSTAT 41722 070209 SERVICE cont LIMIT THERMOSTAT FIG 12 1 LIMIT THERMOSTAT Location The limit thermostat is located inside the rear of the hood on the tank lid Test Procedures 1 Disconnect the brewer from the power source 2 Disconnect the blue and black wires from the limit thermostat 3 Check for continuity across the limit thermostat terminals with a ohmmeter Page 12 If continuity is presentas described the limitthermostat is operating properly If continuity is not present as described replace the limit thermostat Removal and Replacement 1 Remove all wires from limit thermostat termi nals 2 Carefully slide the limit thermostat out from under the retaining clip and remove limit thermostat 3 Carefully slide the new limit thermostat into the retaining clip 4 Refer to the schematics when reconnecting the wires Lead from Control Thermostat to Tank Heater Switch FIG 12 2 LIMIT THERMOSTAT TERMINALS 41722 070209 SERVICE cont TANK HEATER FIG 13 1 TANK HEATER Location The tank heater is located inside the tan
17. from the switch terminals 2 Remove the clips on the switch bezel inside the hood and gently push the switch through the 2 te YELLOW opening 3 Push the new switch into the opening from inside the hood and secure into place by pressing the 53 BLACK bezel through the front of the hood Make sure the clips on the switch bezel are locked around the switch housing and spread the clips to hold BRN BLK the switch captive in the hood 4 Refer to FIG 15 2 when reconnecting the wires LEFT OFF RIGHT TB6 FIG 15 2 ON OFF SWITCH TERMINALS 41722 070209 Page 15 SERVICE cont START SWITCHES WHI YEL to Timer T5 WHI ORN to Timer T3 P N 37079 0000 P N 37080 0001 Non Lighted Green ready light FIG 16 1 START SWITCHES P N 37079 0000 Location The start switch is located in the front of the hood above and to the right of the brew funnel WHI YEL Test Procedure to Timer T5 1 Disconnect the brewer from the power source 2 Remove the wires from all four terminals GREEN 3 Check for continuity across the two terminals on the right side of the switch when it is held in the lower position Continuity must not be present WHI ORN across these terminals in the upper position to Timer T3 4 Check for continuity across the two terminals on the left side of the switch when it is held in the lower position Continuity must not be present across these terminals in the upper position P N 37079 0000 If c
18. imer is operat ing properly If voltage is not present as described disconnect the brewer from the power source and replace the timer Removal and Replacement 1 Remove the two 76 32 screws lock washers and spacers securing timer to bracket 2 Disconnect all wires from the timer 3 Referto schematic and reconnect wires 4 Install new timer to bracket with the two 76 32 screws lock washers and spacers 5 Adjust the timer as required FIG 18 2 TIMER TERMINALS Terminals 9 1 batch connector J 4 Dilution delay time 1 2 NORMAL 3 4 2x SW 1 Programming Enable Disable TRM 1 White Violet L1 in from ON OFF switch TRM 2 White Red Neutral L2 TRM 3 White Orange Start switch TRM 4 White Green Brew solenoid TRM 5 White Yellow Start switch TRM 6 White Blue Dilution solenoids 41722 070209 SERVICE cont BREW DILUTION TIMER amp TB6 cont PROGRAM BUNN O MATIC DELAY Lus p 5 40384 1 1 2 snp Zg x 1111 a snm 1 3 DILUTION MINUTES amp x ll 4 E 6 IL 2 E 3 8 d 2 2 gt MUS uc 5 27 Nig
19. k and secured to the tank lid Test Procedures 1 Disconnect the brewer from the power supply 2 Turn on thermostat Check the voltage across the black and white wires on 120 volt models or the black and red wires for 200 volt models and 230 volt models with a voltmeter Connect the brewer to the power source The indication must be a 120 volts ac for two wire 120 volt 20 amp models b 200 to 230 volts ac for two wire 200 or 230 volt models 3 Disconnect the brewer from the power source If voltage is present as described proceed to 4 If voltage is not present as described refer to the Wir ing Diagrams and check wiring harness 4 Disconnect the wires from the tank heater termi nals 5 Checkresistance value acrosstank heaterterminals and compare to chart If resistance is present as described reconnect the wires the tank heater is ok Page 13 RESISTANCE 7 90 9 20 550 640 29 0 0 33 7 0 1680W 120V 1680W 100V 1680W 230V TERMINAL TO SHEATH INFINITE OPEN If resistance is not present as described replace the tank heater NOTE If any resistance is read between sheath and either terminal remove and inspect heater for cracks in the sheath Removal and Replacement Disconnect the brewer from the power supply Disconnect the water supply from the brewer Disconnect the wires from the limit thermostat Disconnect the wires from the tank heater termi nals 5 Remove
20. ly depending on local water conditions Excessive min eral build up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks 3 Solenoid Valve 1 Timer 1 Solenoid Valve 1 Dispenser 2 Timer 3 Solenoid Valve Page 7 REMEDY Refer to Service Control Ther mostat for testing procedures The brewer must be level or slightly lower in front to syphon properly Inspect the tank assembly for excessive lime deposits Delime as required Remove the solenoid valve and clear any obstructions Rebuild or replace the valve if necessary Refer to Service Timer for test ing procedures Remove the Solenoid Valve and clean any obstruction Rebuild or replace the valve if necessary The dispenser must be com pletely empty before starting a brew cycle Refer to Service Timer for test ing procedures Remove the Solenoid Valve and clean any obstruction Rebuild or replace the valve if necessary 41722 070209 TROUBLESHOOTING cont PROBLEM Weak beverage Dry coffee grounds remain in the funnel Brewer is making unusal noises PROBABLE CAUSE Filter Type n2 Coffee Grind Sprayhead 4 Funnel Loading Water Temperature 1 Funnel Loading 1 Solenoid n2 Plumbing Lines Water Supply Page 8 REMEDY BUNN paperfilters must be used for proper extraction A fine or drip grind must be used for pro
21. ontinuity is not present as described replace the switch If continuity is present as described reconnect the wires the switch is operating properly WHI YEL If continuity is not present as described replace the to Timer T5 switch NOTE No continuity will show across the left terminals of the lighted switch since the light is neon PLK to T Stat Removal and Replacement WHI ORN 1 Remove the wires from the switch terminals to Timer T3 2 Compress the clips inside the hood and gently push the switch through the opening Push the new switch into the opening and spread the clips to hold the switch captive in the hood 4 Refer to Fig 16 2 when reconnecting the wires BLU BLK P N 37080 0001 to T Stat FIG 16 2 START SWITCH TERMINALS Page 1 6 41722 070209 SERVICE cont INLET VALVES oe 1 1 GL FIG 17 1 INLET VALVES Location The solenoid valve s are located inside the trunk onthe lower center part of the component bracket So lenoids in the early models are located in the hood Test Procedures 1 Check the solenoid valve for coil action With ON OFF switch in the upper position press start switch and listen carefully in the vicinity of the solenoid valve for clicking sound as the coil magnet attracts 2 Disconnect the brewer from the power source If the sound is heard as described and water will not pass through the solenoid val
22. per extraction A six hole stainless steel spray head must be used for proper extraction The BUNN paper filter must be centered in the funnel and the bed of ground leveled by gentle shaking Place an empty funnel on an empty dispenser beneath the sprayhead Initiate a brew cycle and check the water temperature immediately below the sprayhead with a ther mometer The reading should not be less than 200 F 93 C Adjust the control thermostat to increase the water temperature Replace if necessary The BUNN paper filter must be centered in the funnel and the bed of grounds leveled by gently shaking The nut on the solenoid must be tight or it will vibrate during Operation Plumbing lines should not resting on the counter top A The brewer must be connected to a cold water line B Water pressure to the brewer must not exceed 90 psi 620 kPa Install a regulator if necessary to lower the working pressure to ap proximately 50 psi 345 kPa 41722 070209 TROUBLESHOOTING cont PROBLEM PROBABLE CAUSE REMEDY Brewer is making unusal noises 4 Tank Heater Remove and clean lime off the cont tank heater Page 9 41722 070209 SERVICE This section provides procedures for testing and replacing various major components used in this brewer should service become necessary Refer to Troubleshooting for assistance in determining the cause of any problem WARNING Inspection testing and repair of elec
23. put MV 1 Line in Page 21 41722 070209 SCHEMATIC WIRING DIAGRAM TB3Q OPTIONAL READY DEI GREEN N LIMIT THERMOSTAT TANK HEATER BLK L i BLK Wal ri WHI BLK WHI YEL 120 VOLTS AC 2 WIRE SINGLE PHASE 37234 0001A 08 04 2004 BUNN O MATIC CORPORATION SCHEMATIC WIRING DIAGRAM F GRN YEL SW amp 4 LIMIT THERMAL THERMAL THERMOSTAT NE I FUSE 230 VOLTS AC 2 WIRE SINGLE PHASE 3723400034 11 04 2004 BUNN O MATIC CORPORATION Page 22 41722 070209 SCHEMATIC WIRING DIAGRAM TB3 TB3B TB3 LP L1 Earth Ground N SWITCH amp LIMIT THERMOSTAT gu ek 008888 Ground e LEE m I I I 2 5 Dhiba er ces TANK HEATER WHI WHI D 0 OU I TIMER 65 432 1i TTI CL WHI DILUTION 1 READY INDICATOR 1 WHI VIO WHI BLU WHI VIO WHI GRN START WHI ORN 4 n SWITCH WHUYEE icine 100 VOLTS AC 120 VOLTS AC 2 WIRE GND SINGLE PHASE 3 234 0007A 02 08 2008 BUNN O MATIC CORPORATION Page 23 41722 070209 L1 SCHEMATIC WIRING DIAGRAM TB3B W HALF BATCH Earth Ground T SWITCH amp THERMOSTAT THERMOSTAT Chassis Ground e DIL 4 BLU BLK j BLK WHI HO j TANK HEATER WHI WHI BLK HALF OFF FULL SWITCH KEEP WARM HEATER ee le 1 te 1 SWTA SWC 51010 BREW DILUTION TIMER 654321 WHI VIO
24. sprayhead and the hex nut securing the sprayhead tube to the hood Set aside for reas sembly 6 Remove the six 10 screws securing the tank lid to the tank 7 Remove the tank lid with limit thermostat spray head tube and tank heater 8 Remove the two hex nuts securing the tank heater to the tank lid Remove tank heater with gaskets and discard 9 Install new tank heater with gaskets on the tank lid and secure with two hex nuts Install tank lid with limit thermostat sprayhead tube and tank heater using six 710 screws Secure sprayhead tube to hood using hex nut removed in step 4 12 Install sprayhead 15 Reconnect the wires to the limit thermostat and tank heater 16 Reconnect the water and power supply Bom 1 1 41722 070209 SERVICE cont LIGHTED ON OFF SWITCH TB3 TB3Q P N 37080 0000 Orange light FIG 14 1 LIGHTED ON OFF SWITCH Location The ON OFF switch is located in the front of the hood above and to the left of the brew funnel Test Procedure Brewers W Out Half Batch or Sweetener Options Disconnect the brewer from the power source Remove the wires from all four terminals Check for continuity across the two terminals on the lower right of the switch as shown Continuity must be present across these terminals in the ON position COS If continuity is present as described reconnect the wires the switch is operating properly If continuity is not present
25. tri cal equipment should be performed only by qualified service personnel The brewer should be unplugged when servicing except when electrical tests are re quired and the test procedure specifically states to plug in the brewer COMPONENT ACCESS WARNING Disconnect the brewer from the power source before the removal of any panel or the replace ment of any component All components are accessible by the removal of the top cover front inspection panel and rear panel 2 P FIG 10 1 COMPONENT ACCESS Page 10 CONTROL THERMOSTAT FIG 10 2 CONTROL THERMOSTAT Location The control thermostat is located in the hood Test Procedures 1 Disconnect the brewer from the power source 2 Locate the blue wire on the control thermostat 3 Check the voltage across the blue black wire on the control thermostat and the white wire on the tank heater on 120V models or red wire on the tank heater on two wire 200V or 230V models with a voltmeter Connect the brewer to the power source The indication must be a 120 volts ac for two wire 120 volt models b 200 to 230 volts ac for two wire 200 or 230 volt models 4 Disconnect the brewer from the power source If voltage is present as described proceed to 75 If voltage is not presentas described referto the wiring diagrams and check the brewer wiring harness 5 Locate the black wire on the control thermostat 6 Gently remove the capillary bulb
26. ve there may be a block age in the water line before the solenoid valve or the solenoid valve may require inspection for wear and removal of waterborne particles If the sound is not heard as described proceed to 3 3 Disconnect the brewer from the power source 4 Connecta voltmeter across the solenoid terminals leave wires connected 5 Connect the brewer to the power source With the ON OFF switch in the ON upper position press the start switch 6 Check the voltage across the solenoid The indica tion must be a 120 volts ac for two wire 120 volt models and Page 17 three wire 120 240 volt models b 200 to 230 volts ac for two wire 200 or 230 volt models 7 Disconnect the brewer from the power source If voltage is present as described proceed to 8 If voltage is not present as described refer to Wiring Diagrams and check brewer wiring harness 8 Check for continuity across the solenoid termi nals If continuity is present as described reconnect the white and black wire from the timer If continuity is not present as described replace the solenoid valve Removal and Replacement 1 Disconnect the brewer from the power source 2 Turn off the water supply to the brewer 3 Remove the wires from the solenoid 4 Disconnectthe water lines to and from the solenoid valve 5 Remove the two screws securing the solenoid mounting bracket to the component bracket 6 Install new solenoid valve to
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