BUN-U3
Contents
1. OPERATING amp SERVICE MANUAL BUNN O MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD ILLINOIS 62708 3227 PHONE 217 529 6601 FAX 217 529 6644 www b To ensure you have the latest revision of the Operating Manual or to view the Illustrated Parts unn com Catalog Programming Manual or Service Manual please visit the Bunn O Matic website at www bunn com This is absolutely FREE and the quickest way to obtain the latest catalog and manual updates For Technical Service contact Bunn O Matic Corporation at 1 800 286 6070 10060 0000K 10 08 1984 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 n2. LATE MODELS BLU from Liquid Level WHI from Main Harness Board 1 120 208V 120 240V 380V and 440V Models RED from Main Harness 208V and 240V Models FIG 23 SOLENOID TERMINALS Page 28 10060 081106 SERVICE cont START SWITCH BREW FIG 24 START SWITCH BREW Location The brew start switch is located on the upper right side of the brewer component housing Test Procedures 1 Disconnect the brewer from the power source 2 Remove the wires from the start switch termi nals 3 Check for continuity across the switch terminals when the switch is held in the lower position Continuity must not be present when the switch is in the upper position If continuity is present as described reconnect the wires the switch is operating properly If continuity is not present as described replace the switch Page 29 Removal and Replacement 1 Remove the wires from the switch terminals 2 Compress the clips on the back side of the switch mounting bracket and gently push the through the opening Push the new switch into the opening and spread the clips to hold switch in the mounting bracket 4 Referto Fig 25 and reconnect the wires BLU to Brew Timer or Brew Lockout Relay ON OFF Switch ALL MODELS EXCEPT 230V CE MODELS BLU to Brew Timer Brew Lockout Relay RED from ON OFF __ Switch 230V CE MODELS F
3. Refer to Service Probe fortesting procedures See page 20 Be sure valve is closed 10060 080900 TROUBLESHOOTING PROBLEM Water not hot Circuit breaker keeps tripping Water keeps running from swing spout Inconsistent coffee yield Funnels overflow PROBABLE CAUSE 1 Limit Thermostat CAUTION Do not eliminate or bypass limit thermostat Use only Bunn O Matic replacement part 29329 1000 2 Control Thermostat 3 Tank Heater s 4 Contactor 1 Circuit Breaker 2 Tank Heater s 1 Timer 2 Start Switch 1 Timer 2 Solenoid Valve 3 Lime build up in swing spout and pump tubing 1 Filters 2 Hole in bottom of funnel ob structed Page 11 REMEDY Refer to Service Limit Thermo stat for testing procedures See 19 Refer to Service Control Ther mostat for testing procedures See page 17 Refer to Service Tank Heater for testing procedures See page 30 Refer to Service Contactor for testing procedures See page 15 Refer to Service Circuit Breaker for testing procedures See page 14 Refer to Service Tank Heater for testing procedures See page 30 Refer to Service Timer for testing procedures See page 31 or 33 Refer to Service Start Switch for testing procedures See page 29 Refer to Service Timer fortesting procedures See page 31 or 33 Refer to Service Solenoid Valve for testing procedures See page 27 Remove swing sp
4. The relay is located on the front part of the com ponent bracket mounted on the top of the timer bracket Test Procedures All Models Except 230V CE Models 1 Disconnect the brewer from the power source 2 Disconnect the wires from relay terminals amp B Check for continuity between terminals amp If continuity is present as described reconnect the wires to terminals amp and proceed to 3 If continuity is not present as described replace the relay 3 Disconnect the wires from relay terminals 2 amp 7 4 Check for continuity across terminals 2 amp 7 If continuity is present as described reconnect the wires to terminals 2 amp 7 and proceed to 5 If continuity is not present as described replace the relay 5 Disconnect the wires from relay terminals 5 amp 7 6 Check for continuity across terminals 5 amp 7 by manually closing relay contact Continuity must not be present when contact is released Page 24 If continuity is present as described reconnect the wires the relay is operating properly If continuity is not present as described replace the relay 230V CE Models 1 Disconnect the brewer from the power source 2 Disconnect the black wire from relay terminal and the red wire from relay terminal Check the voltage across the black and red wire with a voltmeter Connectthe brewerto the power source The indication must be 230 volts ac I
5. Fuse 1 Remove the cap from the fuse holder 2 Removefuse fromthe fuse holder inspect if blown discard 3 Install new 5 amp fuse in the fuse holder 4 Reinstall fuse holder cap Fuse Holder 1 Disconnect the wires from the rear of the fuse holder 2 Remove the nut securing the fuse holder to the component bracket Pushfuse holderthrough the hole in the component bracket 4 Install new fuse holder and fuse through the hole in the component bracket and secure with nut 5 Refer to Fig 9 and reconnect the wires BLK from ON OFF Switch 208V 240V Two Wire Models and 380V Three Wire Models RED from ON OFF Switch 230V Two Wire Models BLK from Main Harness 208V and 240V Two Wire Models BLK from Transformer 380V Three Wire Models RED from Main Harness 230V Two Wire Models FIG 9 FUSE HOLDER TERMINALS 10060 031599 SERVICE cont LIMIT THERMOSTAT Removal and Replacement 1 Remove the wires from the limit thermostat ter minals 2 Carefully slide the limit thermostat out from under the retaining clip and remove the limit thermo stat 3 Carefully slide the new limit thermostat into the retaining clip 4 Referto Fig 11 and reconnect the wires Location The limit thermostat is located on the center front of the component bracket behind the timer mounting BLK to Contactor bracket All Models Except BLK to Control 230V CE Models Thermostat All Red to Contactor Mo
6. els RED to Contactor L2 120 208V 120 240 Three Wire Single Phase 208V and 240V Two Wire Single Phase BLU to Main Harness 208V 240V 380V Three Wire Three Phase and 380V 440V Four Wire Three Phase RED Thermal Fuse to Contactor Lower Right Terminal Page 30 NN 27 TANK HEATER TERMINALS 10060 031599 SERVICE THERMAL FUSES 230V CE MODELS ONLY FIG 28 THERMAL FUSES Location The thermal fuses are mounted on the tank heater terminals and the contactor terminals Test Procedures 1 Disconnect the brewer from the power source 2 Disconnect the thermal fuse from the tank heater terminal and the contactor terminal 3 Check for continuity across the terminals on the ends of the thermal fuse If continuity is present as described the thermal is operating properly If continuity is not present as described replace the thermal fuse Removal and Replacement 1 Disconnect the thermal fuse from the tank heater terminal and the contactor and discard 2 Connect the new thermal fuse to the tank heater terminal and the contactor terminal Page 31 TIMER Early Models OLD STYLE FIG 29 TIMER Location The timer is located on the front center of the component bracket Test Procedures 1 Disconnect the brewer from the power source 2 Disconnectthe polarized three pin connectorfrom the brewer main harness and rota
7. If voltage is not present as described refer to wiring diagram and check the brewer wiring harness 5 Reconnectthe black wire and the red to the trans former 6 Disconnectthe black wire and the white wire from the transformer terminals 7 With a voltmeter check the voltage across the transformer terminals Connect the brewer to the power source The indication must be 120 volts ac Page 35 If voltage is present as described the transformer is operating properly If voiltage is not present as described replace the transformer Removal and Replacement 1 Disconnect all the wires from the transformer 2 Removethe two 78 32 screws securing the trans form to the transformer mounting bracket 3 Remove the transformer and discard 4 Positionnewtransformerontransformer mounting bracket and secure with two 8 32 screws 5 Refer to Fig 35 and reconnect the wires __ RED from Terminal Block WHI from Main Harness ext 177 BLK Main Harness BLK from _ Terminal Block FIG 35 TRANSFORMER TERMINALS 10060 031599 SERVICE cont MASTER ON OFF SWITCH Late Models Removal and Replacement 1 Remove all wires from the switch terminals 2 Remove the two screws from the outside of the base and gently push the switch through the opening 3 Locate the new switch into the opening and se cure with screws removed in step 2 4 Refer to FIG 37 when reconnecting the wire
8. P3 ARE PINS OF A POLARIZED FULL HALF THREE PIN CONNECTOR BATCH SWITCH BLK BLU RED Louin 208 VOLTS AC LEVEL 20 RED 240 VOLTS AC BOARD 2 WIRE SINGLE PHASE Page 39 10060 080900 SCHEMATIC WIRING DIAGRAM CE BREWERS S N U300004095 UP GRN YEL L1 POWER IND RED THERMAL THERMAL FUSE FUSE THERMAL THERMAL FUSE FUSE THERMOSTAT START INDICATOR FUSE SWITCH LIGHT Pi SWITCH Cp i WHV BLU WHI RED de eo Dd jj BLU BLU BLU m im LAMPS OE P3 ax 0 WHI GRN TIMER P2 BLK P1 P2 amp P3 ARE PINS iz OF A POLARIZED THREE PIN CONNECTOR FULL HALF SWITCH RED BLK BLU BLK LIQUID 01 230 VOLTS AC BOARD 2 WIRE SINGLE PHASE Al PROBE Page 40 L2 10060 080900 SCHEMATIC WIRING DIAGRAM 03833 GRN YEL L1 N POWER IND WHI Ele 4 BLK 12 BLU 12 TANK HEATER BLK 12 Buct2 Bug UTE RED 12 RED 12 MO BLU 12 SW amp LIMIT THERMOSTAT THERMOSTAT BK dete e ej io ep gt wi RCT BREAKER ON OFF START SWITCH SWITCH WHI BLU BL oun WHI 15 C BLU BLK MEM JE M WHIGRN P3 BLK BLK CST TIMER Pe WHI y WH P1 P2 amp P3 ARE PINS E _
9. single phase 208 volt 230 volt and 240 volt models A3 Checktheterminal blockfor 208 volts ac 240 volts ac 380 volts ac across the black and blue terminals the blue and red and the black and red terminals on three wire three phase 208 volt 240 volt and 380 volt models Page 8 10060 031500 TROUBLESHOOTING cont PROBLEM Brew cycle will not start cont Brew cycle starts with brew lockout relay engaged PROBABLE CAUSE 2 No power or incorrect voltage to the brewer cont 3 Water level below pump housing Water level in the hot water gauge glass should be approximately half full 4 ON OFF Switch 5 Start Switch 6 Relay 7 Timer 8 Pump 9 Solenoid Valve 10 Strainer 1 Relay Page 9 REMEDY A4 Check the terminal block for 440 volts ac across the black and blue terminals black and red termi nals and the red and blue terminals on four wire three phase 440 volt models B Check circuit breakers or fuses Be sure water shut off valve is open and that the in line filters or strain ers are not blocking water flow Do not confuse water shut off valve with the manual fill and drain valve underneath the brewer Referto Service ON OFF Switch for testing See page 22 Refer to Service Start Switches for testing procedures See page 29 Refer to Service Relay for testing procedures See page 24 Refer to Service Timer for testing procedures See page 31 or 33 Refe
10. 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 BrewWISE BrewLOGIC BrewWIZARD BUNN Gourmet Ice BUNN Pour O Matic BUNN Bunn OMatic Bunn O Matic BUNNIink BUNNserve BUNN Espress DBC Dr Brew Dual EasyClear EasyGard Easy Pour FlavorGard Gourmet Ice Gourmet Juice High Intensity IMIX Infusion Series Quality Beverage Equipment Worldwide The Mark of Quality in Bev erage Equipment Worldwide My Caf PowerLogic Safety Fresh Scale Pro Single Smart Funnel Smart Hopper Smart WAVE Soft Heat SplashGard System ThermoFresh 392 AutoPOD AXIOM Beverage Profit Calculator Beverage Bar Creator BrewMETER BUNNSERVE BUNNsource Coffee At Its Best Cool Froth Digital Brewer Control Intellisteam Nothing Brews Like a BUNN Pou
11. 230 volt models C 208 or 240 volts ac for two wire 208 or 240 volt models d 220 or 254 volts ac for four wire 280 or 440 volt models 8 Disconnect the brewer from the power source If voltage is present as described proceed to 9 If voltage is not presentas described refer to the Wiring Diagrams and check the brewer wiring harness 10060 080900 SERVICE cont CONTACTOR cont 9 Check for continuity across the terminals on the left side of the contactor by manually closing the contacts Continuity must not present when the contact is released 10 Check for continuity across the terminals on the right side of the contactor by manually closing the contacts Continuity must not be present when the contact is released If continuity is present as described the contactor is operating properly If continuity is not present as described replace the contactor BLK to Right Tank Heater T1 BLK to Terminal Block L1 RED to Left Tank Heater T2 RED to Terminal Block L2 Removal and Replacement 1 Disconnect all the wires from the contactor 2 Remove the two 78 32 screws securing the con tactor to the contactor mounting bracket remove contactor and protective shield Discard contac tor 3 Install newcontactor with shield between mounting bracket and contactor and secure with two 78 32 screws 4 Refer to Fig 5 and reconnect the wires BLK Thermal Fuse to Right Tank Heater BLK to Termi
12. 26 Removal and Replacement 1 Remove the wires from the switch terminals 2 Compress the clips on the back side of the switch mounting bracket and gently push the through the Opening 3 Push the new switch into the opening and spread the clips to hold switch in the mounting bracket 4 Refer to Fig 21 and reconnect the wires GRY to Brew Timer PNK to Brew Timer E FIG 21 SELECTOR SWITCH TERMINALS 10060 080900 SOLENOID P2209 60 FIG 22 SOLENOID Location The solenoid is mounted on the upper left rear of the component bracket Test Procedures 1 Disconnect the dispenser from the power Source 2 120 208 volt and 120 240 volt three wire single phase models 380 volt three wire three phase models and 380 volt 440 volt four wire three phase models disconnect the black wire from the liquid level board Z2 and the white wire onthe solenoid With a voltmeter check the voltage across the black and the white wire Connect the brewer to the power source The indication must be a 120 volts ac for 380 volt three wire three phase models and 208 Or 240 volts ac for four wire three phase 440 volt models b 208 volts ac for three wire 120 208 volt mod els c 240 volts ac for three wire 120 240 volt mod els B For 208 volt 240 volt two wire single phase and 208 volt 240 volt three wire three phase models disconnect the black wire from the liquid l
13. 6 Disconnect the brewer from the power source 7 Reconnect the three pin connector from the main wiring harness to the connector on the timer If voltage is present as described proceed to 8 If voltage is not presentas described refertothe Wiring Diagrams and check the brewer wiring harness 8 Disconnect the black and white wires to the pump 9 With a voltmeter check the voltage across the black and white wires when the ON OFF switch is in the ON upper position and the start switch pressedtothe start position and released Connect the brewer to the power source The indication must be 120 volts for three wire 120 208 volt 120 240 volt 380 volt and 208 or 240 volt ac for four wire 440 volt models b 208 volts ac for two and three wire 208 volt models C 240 volts ac for two and three wire 240 volt models d 230 volts ac for two wire 230 volt CE models If voltage is present as described the brew timer is operating properly Reset the timer dial as required to obtain the desired brew volume If voltage is not present as described replace the timer Page 32 Removal and Replacement 1 Separate all connectors between the brewer wiring harness and the timer 2 Disconnect the timer leads from the pump leads 3 Remove the two 8 32 screws securing the brew timer to the component bracket and remove timer 4 Install new timer circuit board as described in Late Model Timer section on the fol
14. OF A POLARIZED THREE PIN CONNECTOR FULL HALF BATCH SWITCH i BLU g LIQUID 380 VOLTS AC X 440 VOLTS AC BOARD 4 WIRE 3 PHASE Page 41 10060 080900 SCHEMATIC WIRING DIGRAM 03833 L1 L2 L3 GRN RED 12 _ HEATER FUSE ON OFF Modi SWITCH EUREN P1 P2 amp P3 ARE PINS OF A POLARIZED THREE PIN CONNECTOR Emp E FULL HALF BATCH SWITCH 1 M 380 VOLTS AC 440 VOLTS AC LEVEL 3 WIRE 3 PHASE BOARD Page 42 10060 080900
15. and discard 5 Installnewliquid level board on component bracket and secure with a 10 32 screw and internal tooth lockwasher 6 Install protective shield and secure with 710 32 screw and flat washer 7 Referto Fig 13 and reconnect the wires A T1 BLU to Solenoid Valve T2 BLK to ON OFF Switch All models except 230V CE models T3 WHI to Main Harness 120 208V 120 240V four wire 380V and 440V n models WHI to Transformer 380V three wire models T3 RED to Main Harness 208V 240V single phase and three phase models T3 BLK to Main Harness 230V two wire models T4 PIN to Level Probe P1733 FIG 13 LIQUID LEVEL BOARD TERMINALS 10060 080900 SERVICE cont ON OFF SWITCH FIG 14 ON OFF SWITCH Location The ON OFF switch is located on the left side of the switch mounting bracket The switch mounting bracket is mounted on the front of the component bracket Test Procedures 1 Disconnect the brewer from the power source 2 120 208 120 240V 208V and 240V Models Remove the black wire on the ON OFF switch from the fuse holder or circuit breaker and the red wire on the power indicator light 380V and 440V Models Remove the black wire on the ON OFF switch from the fuse holder or circuit breaker and the white wire from the power indicator light 230V CE Models Remove the red wire on the ON OFF switch from the fuse holder and the black wire on the power
16. brewer Install a regulator in the line when pressure is greater than 90 psi 620 kPa to reduce it to 50 psi 345 kPa The water inlet fitting is 3 8 flare NOTE Bunn O Matic recommends 3 8 copper tubing for installations from the 1 2 water supply line A tight coil of copper tubing in the water line will facilitate moving the brewer to clean the countertop Bunn O Matic does not recom mend the use of a saddle valve to install the brewer The size and shape of the hole made in the supply line by this type of device may restrict water flow This equipment must be installed to comply with the International Plumbing Code ofthe International Code Council and the Food Code Manual of the Food and Drug Administration FDA For models installed outside the U S A you must comply with the applicable Plumbing Sanitation Code for your area INITIAL SETUP CAUTION The brewer must be disconnected from the power source throughout the initial setup except when specified in the instructions IMPORTANT Brewer must be level and installed on a sturdy structure Electrician s and Plumber s Instructions are provided These instructions should be carefully followed before proceeding with initial setup Be sure all electrical and plumbing connections are tight 1 Open manual fill valve located on the bottom of the brewer Water should start filling the tank When water is visible in the hot water gauge glass center spigot close valve Approxima
17. from the contactor coil to the limit thermostat and black wire from the red wire on the main harness 2C 230V MODELS S N U300004095 UP Disconnect the red wire from contactor coil to the limit thermostat and the black wire from the main harness 3 Connect the brewer to the power source 4 Checkthe voltage across the coil wire and the wire from the the main harness The indication must be Page 15 a 120 volts ac for three wire 120 208 120 240 volt and 380 volt models b 230 volts ac for two wire 230 volt models C 208 or 240 volts ac for two wire 208 or 240 volt models d 220 or 254 volts ac for four wire 280 or 440 volt models 5 Disconnect the brewer from the power source If voltage is present as described proceed to 76 If voltage is not presentas described refertothe Wiring Diagrams and check the brewer wiring harness 6 Check for continuity between the black leads on the contactor coil or the left and right terminals on the contactor coil on 230V models If continuity is present as described reconnect the wires and proceed to 77 If continuity is not present as described replace the contactor 7 Onallbrewers with a voltmeter check the voltage across the upper left terminal and the upper right terminal on the contactor Connect the brewer to the power source The indication must be a 120 volts ac for three wire 120 208 120 240 volt and 380 volt models b 230 volts ac for two wire
18. from the timer 4 Attach all wires to the replacement timer board prior to installation to the component mounting bracket Refer to FIG 33 when reconnecting the wires 5 Install new circuit board with spacers as required to the component mounting bracket 6 Adjust the timer as described below Timer Setting NOTE Prior to setting or modifying volumes check that the brewer is connected to water supply the tank is properly filled and a funnel and server are in place 10060 080900 SERVICE cont DIGITAL TIMER Late Models NOTE All volume settings must be done with the sprayhead installed 1 Modifying brew volumes To modify a brew vol ume first check that the SET LOCK switch is in the SET position on the circuit board To increase a brew volume place the ON OFF switch in the position press and hold the START switch until you see three breaks in the water stream from the swing arm Release the switch and press it again one or more times Failure to release the switch within two seconds after the third break in the water stream causes the volume setting to be aborted and previous volume setting will remain in memory Each time the switch is pressed two seconds are added to the brew time period Allow the brew cycle to finish in order to verify that the desired volume has been achieved To decrease a brew volume place the ON OFF switch in the ON position press and release the START switch
19. indicator light 3 Connect the brewer to the power source With a voltmeter check the voltage across the removed wires The indication must be a 120 volts ac for 120 208 volt 120 240 volt and 380 volt models b 208 volts ac for two or three wire 208 volt models C 240 volts ac for two wire 240 volt models prior to U300004095 and three wire 240 volt models d 230 volts ac for two wire 230 volt models U300004095 and up 208 or 240 volts ac for four wire 440 volt mod els 4 Disconnect the brewer from the power source c If voltage is present as described reconnect the wires and proceed to 5 If voltage is not presentas described refertothe Wiring Diagrams and check the brewer wiring harness Page 22 e Disconnect the wires on the ON OFF switch 6 a 120 208V 120 240V 208V 240V 380V and 440V Models Check for continuity across the terminals on the rear of the switch with the switch in the ON upper position Continuity must not be present when the switch is in the OFF lower position b 230V CE Models Check for continuity across the center terminal 2 and the lower terminal 1 when the switch is in the ON upper position Continuity must not present when the switch is in OFF lower 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 Remove the wi
20. once for every two second interval to be removed from the total brew time period then immediately press and hold down the START switch until you see three breaks in the water stream from the swing arm Release the switch Failure to release the switch within two seconds after the third break in the water stream causes the volume setting to be aborted and previous volume setting will remain in memory Allow the brew cycle to finish in order to verify that the desired volume has been achieved 2 Setting brew volumes To set a brew volume first check that the SET LOCK switch is in the SET position on the circuit board Place the ON OFF switch in the position press and hold the START switch until you see three breaks in the water stream from the swing arm and then release the switch Failure to release the switch within two seconds after the third break in the water stream causes the volume setting to be aborted and previous volume setting will remain in memory View the level of the liquid being dispensed When the desired level is reached turn the ON OFF switch to Page 34 NOTE The brewer remembers this volume and will continue to brew batches of this size until the volume setting procedure is repeated NOTE When brewing coffee volume will decrease due to absorption by the coffee grounds NOTE Half Batch and full batch settings must each be set separately 3 Setting programming disable feature I
21. IG 25 BREW START SWITCH TERMINALS 10060 031599 SERVICE TANK HEATERS P2209 60 26 TANK HEATER Location The tank heaters are located on the right center and the left center of the component bracket BLK to Contactor L1 120 208V 120 240 Three Test Procedures 1 Disconnect the brewer from the power source 2 Disconnect the wires from the tank heater 3 Check for continuity across the tank heater termi nals If continuity is present as described proceed to 4 If continuity is not present as described replace the tank heater Removal and Replacement 1 Remove the wires or thermal fuses from the tank heater 2 Remove the four 28 32 screws securing the tank heater to the component bracket 3 Remove tank heater and gasket 4 Positionnewtankheaterand gasket onthe compo nent bracket and secure with four 8 32 screws 5 Refer to Fig 27 and reconnect the wires r RED to Contactor T2 All Models Except 230V CE Models RED Thermal Fuse to Con tactor Top Right Terminal Models 230V CE Models BLK to Contactor T1 All Models Except 230V CE BLK Thermal Fuse to Contactor Top Left Termi nal 230V CE Models o Wire Single Phase 208V and 240V Two Wire Single Phase BLU to Main Harness 208V 240V 380V Three Wire Three Phase and 380V 440V Four Wire Three Phase BLK Thermal Fuse to Contactor Lower Left Terminal 230V CE Mod
22. N OFF SWItCh seo 22 PON Mm 23 Relay e Pm 24 Selector Switch Half Batch 26 SBIBBDI osna R 27 Start Switch 29 Tank Heater 30 Thermal Cut off ene mem pbi 31 Timer Early Models P 31 Digital Timer Late 5 33 Transformer TEN 35 Master ON OFF Switch Late 36 Wiring 37 thru 42 FIG 1 COMPONENT ACCESS 10060 011708 SERVICE cont CIRCUIT BREAKER 120 208V and 120 240V Three Wire Models and 440V Four Wire Models P2209 60 FIG 2 CIRCUIT BREAKER Location The circuit breaker is located on the right rear of the component bracket Test Procedures 1 Disconnect the brewer from the power source 2 Disconnect the black wire from the main harness from the circuit breaker and the white wire on the pump assembly With a voltmeter checkthe voltage across the black wire and the white wire Connect the brewer to the power source The indication must be a 120 volts ac for three wire 120 208 volt and 120 240 volt models b 208 or 240 volts ac for four wire 440 volt mod els 3 Disconnect the brewer from the power source If voltage is present as described reconnect the white wire to the pump assembly and proceed to 4 If volt age is not pre
23. P2 amp P3AREPINS 2 OF A POLARIZED THREE PIN CONNECTOR FULL HALF BATCH SWITCH BLK i ST BLU WHI 120 208 VOLTS AC uu 120 240 VOLTS LEVEL S WHI BOARD PNK 3 WIRE GND 4 C SINGLE PHASE Page 37 10060 011708 SCHEMATIC WIRING DIAGRAM 0333 amp 03833 GRN A E 13 POWER IND 7 BLK api RED 1 I LZ BLK 12 BLU 12 TANK HEATER BLK 12 1 0 BUE 12 iL RED 12 NO BLU 12 SW amp LIMIT ie THERMOSTAT BLK ee io o 1 ee e e ei SELECTOR SWITCH CIRCUIT ON OFF START N A W HALF BREAKER SWITCH BATCH OPTION SWITCH uoa 1 UY 1 Pi WHI BLU an Cant MM BLU BLK 0 BLK j G SB 000 oris op 20084 AMP Bue Mm P3 BE T5 T8 4 WHI GRN i BREW 1 lt ITI Tot WHI P1 P2 amp P3 ARE PINS um rhe OF A POLARIZED HALF BATCH OPTION THREE PIN CONNECTOR passag cc nennen FULUHALF SWITCH BLK 80 pr BLU RED LIQUID 208 VOLTS AC LEVEL 2 u RED 240 VOLTS AC BOARD D PAK 3 WIRE 3 PHASE Page 38 10060 080900 L1 SCHEMATIC WIRING DIAGRAM U3A amp U38A BREWERS PRIOR TO U300004095 GRN En Lo POWER IND BLK 14 RED BLK 12 J BLK 12 RED 12 K1 12 he un BED AZ JL RED 12 BREW LOCKOUT OPTION _ K1 N O i SW amp LIMIT Cr THERMOSTAT BLK i e ei BLK A EE BLK RED START LIGHT P1 P2 amp
24. To empty funnel invert it over a waste container to dispose of filter and grounds An additional flange is provided on the funnel to help make this step easier NOTE Hot water may be drawn from the hot water faucet during a brew cycle However if a large amount of hot water is drawn off over 1 gallon operator should wait to do so between brewing cycles CLEANING NOTE Tanks and tank components should be delimed regularly based on local water conditions Excessive mineral build up on stainless steel surfaces can initiate corrosion reactions resulting in serious leaks 1 Remove both funnels funnel lids and supports under hot water rinse away all coffee oils Wipe with a clean damp cloth 2 Drain both coffee reservoirs by opening coffee faucets When empty close faucets 3 Cycle two or three inches of water into each coffee reservoir and scrub entire reservoir area NOTE The brewer must NOT be rinsed or cleaned by a water jet device 4 Drain both coffee reservoirs and rinse Use clean damp cloth to wipe both reservoirs Install both coffee funnel supports funnels and funnel lids Remove the sight gauge cap insert sight gauge cleaning brush into the sight gauge glass tube and clean To clean coffee faucets remove the faucet handle from the faucet and faucet clean out cap Clean faucet with a faucet cleaning brush and wipe all parts with a damp cloth Replace faucet seat cups periodically if badly stained or to stop faucet drippin
25. ak in the water stream causes the volume setting to be aborted and previous volume setting will remain in memory and press it again one or more times Each time the switch is pressed two seconds are added to the brew time period Allow the brew cycle to finish in order to verify that the desired volume has been achieved To decrease a batch size Press and release the START or BREW switch once for every two second interval to be removed from the total brew time period then immediately press and hold down the START or BREW switch until you see three breaks in the water stream from the swing arm Release the switch Failure to release the switch within two seconds after the third break in the water stream causes the volume setting to be aborted and previous volume setting will remain in memory Allow the brew cycle to finish in order to verify that the desired volume has been achieved Setting batch sizes To set a batch volume first check that the SET LOCK switch is in the SET position on the circuit board Press and hold the START or BREW switch until you see three breaks in the water stream from the swing arm and then release the switch Failure to release the switch within two seconds after the third break in the water stream causes the volume setting to be aborted and previous volume setting will remain in memory View the level of the liquid being dispensed When the desired level is reached turn the ON OFF switch to OFF lower The bre
26. crews securing the relay to the relay mounting bracket 3 Remove relay and discard 4 For 120 208V 120 240V 208V 380V 440V and 240V models prior to U300004095 install new relay on relay mounting bracket and secure with 76 32 screw 230V models U300004095 and up install new relay relay mounting bracket and secure with two 26 32 screws 5 Refer to Fig 19 and reconnect the wires Page 25 BLU from Start Switch _ BLU from Brew Timer BLK to Control Thermostat RED from Main Harness 120 208V 120 240V 208V 380V 440V AND 240V MODELS PRIOR TO U300004095 BLU to Start Switch BLU from Brew Timer ED to Control hermostat BLK from Main Harness 230V MODELS 20300004095 AND FIG 19 RELAY TERMINALS 10060 080900 SERVICE cont SELECTOR SWITCH HALF BATCH OPTION P1317 FIG 20 SELECTOR SWITCH HALF BATCH Location The selector switch is located in the upper center of the switch mounting panel Test Procedures 1 Disconnect the brewer from the power source 2 Disconnect the wires from the switch terminals 3 Check for continuity across the switch terminals with the switch in the CLOSED left half posi tion Continuity must not present when the switch is in the OPEN right full position If continuity is present as described the switch is operating properly If continuity is not present as described replace the switch Page
27. d 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 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 to 1 Check the terminal block for the brewer 120 volts ac across the red and white terminals and the black and white terminal on three wire 102 208 volt or 120 240 volt models A2 Checktheterminal blockfor 208 volts ac 230 volts ac or 240 volts ac on Series brewers across the red and black terminals on two wire
28. dels Except Test Procedures 230V CE Models cena 1 Disconnect the brewer from the power source 2 Disconnect the black wires or the red wires from 230 Models the limit thermostat 3 With an ohmmeter check for continuity across the limit thermostat terminals 11 LIMIT THERMOSTAT TERMINALS If continuity is presentas described the limitthermostat is operating properly If continuity is not present as described replace the limit thermostat Page 19 10060 080900 SERVICE cont LIQUID LEVEL BOARD AND LEVEL PROBE LEVEL PROBE Location The liquid level board is located on the left rear of the component bracket The level probe is located on the right rear of the component bracket Test Procedures 1 Disconnect the brewer from the power source 2 Disconnect the blue wire T1 and the pink wire T4 Check the voltage across terminals T2 and 3 with the ON OFF switch in the position The indication must be 120 volts ac for 120 208 volt 120 240 volt and 380 volt models b 208 volts ac or 240 volts ac for two wire 208 volt or 240 volt models d 230 volts ac for two wire 230 volt models 220 volts ac or 440 volts ac for four wire 280 volt or 440 volt machines 4 Disconnect the brewer 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 brewe
29. ely 50 psi 345 kPa Removeand clean lime offthetank heater See page 30 10060 080900 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 electri 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 swing spout front cupola cover rear cupola cover and the cupola Disconnect the swing spout nut from the swing spout base fitting Remove swing spout Remove the four 78 32 screws two on the front and rear securing front and rear cupola covers to the cupola Slip cupola off of the component bracket Page 13 Contents Circuit Breaker 14 COMAC 15 Control TITO EOD uaria Op Etui 17 Fuse and Fuse 18 Limit to RE RE RH Rn 19 Liquid Level Board and Level Probe 20 O
30. evel board 2 and the red wire from the solenoid With a voltmeter check the voltage across the black and red wires Connect the brewer to the power source The indication must be a 208 volts ac for 208 volt two wire single phase and 208 volt three wire three phase models b 240 volts ac for 240 volt two wire single phase and 240 volt three wire three phase models Page 27 C For 230V CE two wire single phase models disconnect the red wire from the liquid level board 2 and the black wire from the solenoid With a voltmeter check the voltage across red wire and the black wire Connect the brewer to the power source The indication must be 230 volts ac 3 Disconnect the dispenser from the power source If voltage is present as described proceed to 4 lf voltage is not presentas described referto the brewer Wiring Diagrams and check the wiring harness 4 Disconnect the blue wire and the white wire the blue wire and the red wire or blue wire and black wire from the solenoid terminals 5 Check for continuity across the solenoid valve coil terminals If continuity is present as described reconnect the wires to the solenoid If continuity is not present as described replace the solenoid valve 6 Check the solenoid valve for coil action Connect the dispenser to the power source Listen carefully in the vicinity of the solenoid valve for a clicking sound as the coil magnet attracts If the sound is hea
31. f it be comes necessary to prevent anyone from changing brew time once programmed you can set the SET LOCK switch to the LOCK position This will prevent any further programming until switch is once again put into the SET position ur EE 3 Sj TH y n BLU BLK wire from TL5 to P1 WHI GRN wire from TL4 to WHI Pump WHI BLU wire from to BLK Pump WHI wire from TL2 to P2 BLK wire from TL1 to P3 J2 Three Pin connector from Half Full Batch Switch FIG 33 DIGITAL TIMER TERMINALS P2037 10060 080900 SERVICE cont TRANSFORMER 380V THREE WIRE MODELS ONLY P1752 55 d FIG 34 TRANSFORMER Location The transformer is located on the top rear of the timer mounting bracket Test Procedures 1 Disconnect the brewer from the power source 2 Disconnect black wire and the red wire from the terminal block at the transformer 3 With a voltmeter check the voltage across the black wire and the red wire Connect the brewer to the power source The indication must be 380 volts ac 4 Disconnect the brewer from the power source If voltage is present as described proceed to 75
32. f voltage is present as described proceed to 3 If voltage is not present as described refer to the Wir ing Diagrams and check the brewer wiring harness 3 Disconnect the brewer from the power source 4 Check for continuity across relay terminals A amp B If continuity is present as described reconnect the wires to terminals amp and proceed to 75 If continuity is not present as described replace the relay 5 With the thermostat in the position and the relay engaged disconnect the brewer from the power source 6 Disconnect the blue wires from relay terminals 1 and 7 Check for continuity across terminals 1 and T If continuity is present as described proceed to 7 If continuity is not present as described replace the relay 7 Turn the thermostat to the OFF position con nect the brewer to the power source and turn the thermostat back to the position Continuity should not be present across terminals 1 amp 7 If continuity is not present as described the relay is operating properly If continuity is present as described replace the relay 10060 080900 SERVICE cont RELAY BREWERS W BREW LOCKOUT Removal and Replacement 1 Disconnect the wires from the relay 2 For 120 208V 120 240V 208V 380V 440V and 240V models prior to 20300004095 remove the 76 32 screw securing the relay to the relay mount ing bracket 230V models U300004095 and up remove the two s
33. g DO NOT CLEAN THE HOT WATER FAUCET 8 Reassemble the coffee faucets 9 Wipe the entire outside surface of the machine with a clean damp cloth Wipe dry NO FILTER HOLDER 1 A filter holder is supplied with each U3 coffee brewer Its purpose is to keep the filters in their originally formed shape to properly fit the brewer funnel 2 It is suggested that only one cluster of filters be placed in the holder at one time for best results 3 Not using the filter holder may permit the filters to gradually widen out towards a flat shape especially so if humidity is present Once a filter has lost its upright side walls it may tend to collapse inward when placed in the brewing funnel If this happens the hot water spray may cause one side to fall inwards letting coffee grounds flow over the edge of filter and into the brewed coffee Proper use of the holder should prevent this problem Page 7 10060 081106 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 boar
34. lowing pages Refer to Fig 33 to reconnect the wires 6 Install the Timer Setting Decal provided with the timer replacement kit on the back of the front access panel 7 Adjustthe timer as required Refer to Late Model Timer section on the following pages m Three Pin Connector from Half Full Batch Switch To Three Pin Female Connector on Main Harness BLK to Pump Lead WHI to Pump Lead OLD STYLE FIG 31 TIMER TERMINALS P1751 10060 080900 SERVICE cont DIGITAL TIMER Late Models FIG 32 DIGITAL TIMER Location The timer is located on the front center of the component bracket 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 Disconnect the brewer from the power source 2 Remove the two 78 32 screws securing circuit board to the mounting bracket 3 Remove circuit board and spacers as required 4 Withavoltmeter checkthe voltage acrossterminals TL1 and TL2 when the ON OFF switch is in the position Connect the brewer to the power source The indication must be a 120 volts ac for three wire 120 208 volt 120 240 volt and 380 volt models b 208 volts ac for two wire 208 volt models C 240 volts ac for two wire 240 volt models d 230 volts ac for two wire 230 volt CE models 208 or 240 volts ac for four wire 440 volt mod els 5 Disconnect the b
35. ls e 208 or 240 volts ac for four wire 440 volt mod els 4 Disconnect the brewer from the power source If voltage is present as described reconnect the wires to the pump Install swing spout and position over the reservoir Place the ON OFF the ON upper position and push the start switch and release If pump does not run replace the pump If voltage is not presentas described refertothe Wiring Diagrams and check the brewer wiring harness Page 23 Removal and Replacement Refer to Fig 17 1 Disconnect the wires from the pump assembly 2 Loosen the 78 32 screw 2 securing the clamp 3 on the fill tube 1 and slide the clamp 3 up the fill tube 1 3 Disengagethefilltube 1 fromthe pump assembly 4 4 Remove the four 78 32 screws 6 securing the pump assembly 4 to the component bracket 7 5 Remove pump assembly 4 6 Remove pump gasket 5 and inspect replace if necessary 7 Position gasket 5 on component bracket 7 8 Install new pump assembly 4 on component bracket 7 and secure with four 78 32 screws 6 Install fill tube 1 on pump assembly 4 Slide clamp 3 down into position on the fill tube 1 and tighten screw 2 11 Refer to Fig 17 and reconnect the wires co o 1 WHI from Brew Timer BLK from Brew Timer FIG 17 PUMP INSTALLATION 10060 080900 SERVICE cont RELAY BREWERS W BREW LOCKOUT FIG 18 RELAY Location
36. m main harnessto white 254V phase wire in terminal block 380V 3 wire w Black wire on thermostat 120V ground 3 phase from main harness to white w stepdown wire on step down trans transformer former 4 Disconnect the brewer from the power source If voltage is present as described proceed to 5 Ifvoltage is not presentas described refertothe Wiring Diagrams and check the brewer wiring harness 5 Disconnect the black wires from the control ther mostat 6 Check for continuity across the terminals on the control thermostat with the control thermostat in the ON position fully clockwise continuity must Page 17 be present when the thermostat is in the position fully counterclockwise If continuity is present as described the control ther mostat is operating properly If continuity is not present as described replace the control thermostat Removal and Replacement 1 Disconnect the wires from the control thermo stat 2 Remove the thermostat capillary bulb by firmly pulling up on the capillary at the component bracket This will disengage the grommet from the component bracket 3 Remove the 78 32 screw securing the control thermostatand mounting brackettothe component bracket Remove control thermostat and bracket as an assembly Remove knob from control thermostat Removethetwo 76 32 screws securing the control thermostat to the thermostat mounting bracket Remove and discard thermo
37. nal Block L1 BLK to Terminal Block L2 BLK to left Tank Heate BLK Thermal Fuse to Left Tank Heater RED to Right S Tank Heater L2 WHI from Main Harness 120 208V 120 240V 380V Three Wire Models 380V and 440V Four Wire Models RED from Main Harness 208V 240V Two Wire Models and 208 240V Three Wire Models 120 208V 120 240 208 240V 380V 440V MODELS 5 CONTACTOR TERMINALS BLK to Limit Thermostat to Right Tank Heater Page 16 RED Thermal Fuse RED Thermal Fuse to Left Tank Heater RED to Terminal Block L2 RED to Limit Thermostat 230V CE Models 10060 080900 SERVICE CONTROL THERMOSTAT Location P2209 60 The control thermostat is mounted on the right front of the component bracket Test Procedures 1 Disconnect the brewer from the power source 2 Locate the thermostat and the voltage check points 3 Connect the brewer to the power source Model Check Voltage Across Voltage 120 208V amp 120 Black wire on thermostat 120V 240V 3 wire w from main harness to white ground single phase wire in terminal block 230V 2 wire w Red wire on thermostat 230V ground single from main harness to black phase wire in terminal block 208V or 240V 2 Black wire on thermostat 208V or wire w ground from main harness to red 240V single phase wire in the terminal block 280V or 440V 4 Black wire on thermostat 220V or wire w ground 3 fro
38. o neutral voltage any phase to neutral isis VOLTAGE V1 V2 120 240 139 220 Pit 440 U3A models require 2 wire grounded service rated U3833 requires 4 wire grounded service rated 230 volts ac 30 amp single phase 50 Hz Proceed 380 volts ac or 440 volts ac 30 amp three phase 50 as follows Hz Proceed as follows ELECTRICAL INSTALLATION INSTRUCTIONS NOTE Electrical source should have a circuit breaker between the brewer and the main supply which breaks all poles with a contact separation of at least 3 mm CAUTION Improper electrical installation will damage electronic components 1 2 3 An electrician must provide electrical service as specified Using a voltmeter check the voltage and color coding of each conductor at the electrical source Before electrically connecting the brewer remove the front cupola cover some models have the thermostat knob on the outside of the cover and rotate the thermostat knob fully counterclockwise to the OFF position Keep this knob in the OFF position until performing the Initial Setup Electrical service is connected at the upper rear of the single service and scrambler brewers using a junc tion box On double service brewers the rear decorative channel must be removed for access to the terminal block Connect the brewer to the power source and verify the voltage at the terminal block before proceeding Re place all panels If plumbing is to be hooked up later be su
39. ot 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 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 in 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
40. out and insert deliming rod down into pump tubing as far as possible Use Bunn filters made for the U3 brewer Remove obstruction 10060 080900 TROUBLESHOOTING cont PROBLEM Funnels overflow cont Coffee reservoir overflows Brewer is making unusal noises PROBABLE CAUSE 3 Pump Flow Rate 4 Soft Water 1 Coffee reservoir not completely empty befor a brew cycle was started 2 Timer 3 Pump Flow Rate 1 Solenoid Valve 2 Plumbing lines 3 Water supply 4 Tank Heater s Page 12 REMEDY Checkpumpflow rate with a watch Pumpflow rate should be approxi mately 24 ounces in 15 seconds Be sure pump assembly is free of any obstructions When using a water softener a coarse grind of coffee may be preferred If required a bypass system is available as an optional feature Be sure coffee reservoir is empty before brew cycle is started Refer to Service Timer for testing procedures See page 31 or 33 Checkpumpflow rate with a watch Pumpflow rate should be approxi mately 24 ounces in 15 seconds Be sure pump assembly is free of any obstructions The nut on the solenoid must be tight or it will vibrate during operation Plumbing lines should not be rest ing 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 pressure to approxi mat
41. r to Service Pump for testing procedures See page 23 Referto Service Solenoid Valve for testing procedures See page 27 A Direction of flow arrow must be pointing towards brewer B Remove the strainer and check for obstructions Clear or replace Refer to Service Relay for testing procedures See page 24 10060 080900 TROUBLESHOOTING cont PROBLEM Tank not filling Water running out of the over flow PROBABLE CAUSE 1 0N OFF Switch This switch must be in the ON position for the refill circuit to operate 2 No water 3 Solenoid Valve 4 Probe 5 Liquid Level Board 1 Brewer not level 2 Solenoid Valve 3 Liquid Level Board 4 Probe 5 Manual fill and drain valve un derneath brewer open Page 10 REMEDY Refer to Service ON OFF Switch for testing procedures See page 22 Be sure water shut off is open and that in line filters or strainers are not blocking water flow Do not confuse water shut off valve with the manual fill and drain valve underneath brewer Refer to Service Solenoid Valve for testing procedures See page 27 Referto Service Probefortesting procedures See page 20 Refer to Service Liquid Level Board for testing procedures See page 20 Brewer must be level and installed on a sturdy structure Refer to Service Solenoid Valve for testing procedures See page 27 Refer to Service Liquid Level Board for testing procedures See page 20
42. r wiring harness 5 Reconnect the blue wire to T1 on the liquid level board 6 Carefully connect a piece of insulated jumper wire to terminal 4 Keep the other end of this wire away from any metal surface of the brewer Page 20 7 Touching the free end of the jumper to the brewer s frame simulates a FULL condition preventing jumper from touching the brewer s frame simulates NEED WATER condition Connect the brewer to the power source simulate the conditions in the chart below while measuring the voltage between T1 and T3 On the liquid level board Repeat these several times There is an approximate five second delay for output to stabilize Model Voltage Voltage Jumper Jumper Not Touching Touching Frame Frame 120 208V amp 120V 0 120 240V 3 wire w ground single phase 230V 2 wire 230V 0 w ground single phase 208V or 240V 208V or 0 2 wire wground 240V 0 single phase 280V or 440V 220V or 0 4 wire w ground 254V 0 3 phase 380V 3 wire 120V 0 w ground 3 phase w stepdown trans former 8 Disconnectthe brewer from the power source and remove the jumper wire from terminal 4 If voltage is present as described liquid level board is operating properly proceed to 9 If voltage is not present as described replace the liquid level board 10060 080900 SERVICE LIQUID LEVEL BOARD AND LEVEL PROBE 9 Reconnect the pink wire to terminal 4 10 Remove the t
43. rd 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 removal of waterborne particles If the sound is not heard as described replace the solenoid valve Removal and Replacement Remove the wires from the solenoid valve Turn off the water supply to the dispenser Disconnectthe water inlet line from the connector on the solenoid valve 4 Remove the 10 32 screw and the flat washer securing the liquid level board shield and the solenoid to the component bracket 5 Remove solenoid connectors air chamber and tank inlet tube as an assembly Cono 10060 080900 SOLENOID BLU from Liquid Level WHI from Main Harness Board 1 120 208V 120 240V 380V 6 Remove the tank inlet tube grommet and dis and 440 Models card RED from Main Harness 7 Install new tank inlet tube grommet S 208V and 240V Models 8 Install new solenoid assembly 9 Install liquid level board shield and secure solenoid 10 11 12 assembly and shield to the component bracket with a 10 32 screw and flat washer Install water inlet tube to connector on the sole noid EARLY MODELS Turn on the water supply to the brewer Refer to Fig 23 and reconnect the wires BLU from Liquid Level Board 1 _ BLK from Main Har ness EARLY 230V CE MODELS
44. re the brewer is disconnected from the power source If plumbing has been hooked up the brewer is ready for Initial Setup NOTE Schematic wiring diagrams are included in this manual Page 4 10060 011708 CE REQUIREMENTS This appliance must be installed in locations where it can be overseen by trained personnel For proper operation this appliance must be installed where the temperature is between 5 C to 35 C Appliance shall not be tilted more than 10 for safe operation An electrician must provide electrical service as specified in conformance with all local and national codes e This appliance must not be cleaned by water jet This appliance is not intended for use by persons including children with reduced physical sensory or mental capabilities or lack of experience and knowledge unless they have been given instructions concerning use of this appliance by a person responsible for its safety Children should be supervised to ensure they do not play with the appliance e f the power cord is ever damaged it must be replaced by the manufacturer or authorized service personnel with a special cord available from the manufacturer or its authorized service personnel in order to avoid a hazard PLUMBING REQUIREMENTS These brewers must be connected to a cold water system with operating pressure between 20 138 and 90 psi 620 kPa from a 1 2 or larger supply line A shut off valve should be installed in the line before the
45. reased by turning knob counterclockwise When desired temperature is reached insert funnel support funnel and funnel cover in position Be sure the water swing spout is over the center of the funnel cover turn ON OFF switch to the ON position push and release START and run a brew cycle of hot water only At the end of this cycle brewer will be ready for checking timer adjustment The timer has been preset for a 4 minute cycle This setting will deliver approximately 3 gallons of water per brewing cycle To increase or decrease amount of water adjust the timer as required See Adjusting Brew Volumes Having determined final settings of the thermostat and the timer replace front cupola cover Brewer is now ready for brewing coffee ADJUSTING BREW VOLUMES CAUTION Disconnect the power source from the brewer prior to the removal of any panel for the replacement or adjustment of any component NOTE Prior to setting or modifying batch sizes check that the brewer is connected to water supply the tank is properly filled and a funnel support funnel and funnel cover are in place 1 Modifying batch sizes modify a batch volume first check that the SET LOCK switch is in the SET posi tion on the circuit board To increase a batch size Press and hold the START or BREW switch until you see three breaks in the water stream from the swing arm Release the switch Failure to release the switch within two seconds after the third bre
46. res from the switch terminals 2 Compress the clips on the back side of the switch mounting bracket and gently push the through the opening 3 Pushthe new switch into the opening and spread the clips to hold switch in the mounting bracket NOTE ON 230V CE models terminal 3 must be on the top 4 Referto Fig 15 and reconnect the wires BLK from Main Harness sD BLK to Start Switch Brew Timer amp Liugid Level Board L2 120 208V 120 240V 208V 240V 380V AND 440V MODELS BLK from Main Harness C Timer amp Liquid Level Board E RED to Main Harness s A 230V CE Models RED to Start Switch Brew lt FIG 15 ON OFF SWITCH TERMINALS 10060 080900 SERVICE cont PUMP ASSEMBLY P o FIG 16 PUMP ASSEMBLY O P2209 60 Location The pump is located on the center rear of the component bracket Test Procedures 1 Disconnect the brewer from the power source 2 Disconnect the black wire from the black lead on the pump and the white wire from the black lead on the pump 3 With a voltmeter check the voltage across the black wire and the white wire Connect the brewer to the power source The indication must be a 120 volts ac for three wire 120 208 volt 120 240 volt and 380 volt models b 208 volts ac for two or three wire 208 volt models c 240 volts ac for two or three wire 240 volt models d 230 volts ac for two wire 230 volt mode
47. rewer from the power source If voltage is present as described proceed to 76 If voltage is not presentas described refertothe Wiring Diagrams and check the brewer wiring harness Page 33 6 Withavoltmeter checkthe voltage acrossterminals TL1 and TL4 when the ON OFF switch is in the position Connect the brewer to the power source The indication must be O volts If voltage is as described proceed to 7 If voltage is not as described disconnect the brewer from the power source and replace the timer 7 With a voltmeter check the voltage across ter minals TL1 and TL4 when the ON OFF switch is in the position Connect the brewer to the power source and press the START switch The indication must be as follows 120 volts ac for three wire 120 208 volt 120 240 volt and 380 volt models b 208 volts ac for two wire 208 volt models 240 volts ac for two wire 240 volt models d 230 volts ac for two wire 230 volt CE models 208 or 240 volts ac for four wire 440 volt mod els If voltage is present as described the brew timer is operating properly Reset the timer as required to obtain the desired brew volume 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 78 32 screws securing circuit board to the mounting bracket 2 Remove circuit board and spacers as required 3 Remove all wires
48. ring Profits Pulse Wave Signature Series Silver Series Smart Heat Tea At Its Best The Horizontal Red Line Titan Ultra are either trademarks or registered trademarks of Bunn O Matic Corporation Page 2 10060 100908 INTRODUCTION This brewer will brew a three gallon batch of coffee into each reservoir one at a time Each reservoir has its own dispensing faucet s The brewer also has a hot water faucet s for allied beverage use It is only for indoor use on a sturdy counter where ambient temperature is in the range of 10 30 C 50 85 F Brewer to be installed at a location where it can be overseen by trained personnel USER NOTICES Carefully read and follow all notices on the brewer and in this manual They were written for your protection All notices on the brewer are to be kept in good condition Replace any unreadable or damaged labels WARNING Fill water tank before turning on thermostat or connecting appliance to power source Use only on a properly protected circuit capable of the rated load Electrically ground the chassis Follow national local electrical codes Do not use near combustibles FAILURE TO COMPLY RISKS EQUIPMENT DAMAGE FIRE OR SHOCK HAZARD READ THE ENTIRE OPERATING MANUAL BEFORE BUYING OR USING THIS PRODUCT THIS APPLIANCE IS HEATED WHENEVER CONNECTED TO A POWER SOURCE 00831 0000F 3 98 1998 BUNN O MATIC CORPORATION 00831 0000 A WARNING Very Hot Water Use Wi
49. s Incoming Power Supply L1 BLK Location Nu Main Wiring harness The Master ON OFF switch is located in the top hous BLK ing at the rear FIG 36 P1752 55 FIG 36 MASTER ON OFF SWITCH LOC RED Test Procedure 1 Disconnect the brewer from the power source and remove the wires from all terminals of the P3955 Master ON OFF switch FIG 37 MASTER ON OFF SWITCH WIRING 2 Check for continuity across the two terminals on the switch at L1 BLK and BLK to Main Harness when it is held in the lower position Fig 32 Check for continuity across the two terminals on the switch at L2 RED and RED to Main Harness when it is held in the lower position Continuity must not be present across these terminals in the upper position If continuity is present as described reconnect the wires the switch is operating properly If continuity is not present as described replace the switch Page 36 10060 011708 SCHEMATIC WIRING DIAGRAM 03 amp 038 GRN e MAIN ON OFF SWITCH Late Models only POWER IND BLK BLK TANK HEATER 1 I BLK 12 BLK 12 RED 12 N O BLK 12 TANK un RED 12 4 RED 12 N O SW amp THERMOSTAT LIMIT Dx THERMOSTAT BK de e e o de l Gagne BREAKER ON OFF EUR i switch SWITCH WHI BLU BU BLK n BLK 1 er aA o sg WHUGRN BLK PS i BREW i S i TIMER i WHISS WH P1
50. sent as described refer to the Wiring Diagrams and check the brewer wiring harness Page 14 4 With the black wire removed remove the other black wire from the circuit breaker 5 Check for continuity across the terminals on the circuit breaker If continuity is present as described the circuit breaker is operating properly If continuity is not present as described press the reset button and repeat step 5 if continuity is not present as described replace the circuit breaker Removal and Replacement 1 Remove wires from the circuit breaker 2 Removethe nut securing the circuit breaker to the component bracket 3 Remove circuit breaker and discard 4 Install new circuit breaker on component bracket and secure with nut 5 Referto Fig 3 and reconnect the wires dm re BLK from Main Harness BLK from ON OFF Switch FIG 3 CIRCUIT BREAKER TERMINALS 10060 080900 SERVICE cont CONTACTOR P2209 60 FIG 4 CONTACTOR Location The contactor is located on the left front of the component bracket Test Procedures 1 Disconnect the brewer from the power source 2A 120 208V 120 240V 380V THREE WIRE MODELS 380V and 440V FOUR WIRE MODELS Disconnect the black wire from the contactor coil to the limit thermostat and black wire from the white wire on the main harness 2B 208V or 240V TWO WIRE MODELS Prior to U300004095 208V and 240V THREE WIRE MODELS Disconnect the black wire
51. stat 6 Install new control thermostat on thermostat mounting bracket and secure with two 76 32 screw Install knob on thermostat Install thermostat and mounting bracket on the component bracket and secure with one 8 32 screw 9 Carefully bend the capillary tube so that the tube and bulb inside the brewer are in the vertical posi tion NOTE The capillary tube must be clear of any electrical termination and not kinked 10 Refer to Fig 7 and reconnect the wires 11 Adjust the control thermostat as required pug co 74 BLK from Main Har ness All Models Ex cept 230V CE Models RED from Main Harness 230V CE Models BLK to Limit Thermostat All Models Except 230V CE Models RED to Limit Thermostat 230V CE Models P1730 80 7 CONTROL THERMOSTAT TERMINALS 10060 080900 SERVICE cont FUSE AND FUSE HOLDER 208V 240V 230V Two Wire Models and 380V Three Wire Models FIG 8 FUSE AND FUSE HILDER Location The fuse and fuse holder are located on the right rear of the component bracket Test Procedures 1 Disconnect the brewer from the power source 2 Remove the cap and fuse from the fuse holder 3 Remove fuse from the cap 4 Check for continuity through the fuse If continuity is present as described reinstall the fuse the fuse is operating properly If continuity is not present as described replace the fuse Page 18 Removal and Replacement
52. te the brew timer dial fully counterclockwise 3 Witha voltmeter check the voltage across sockets P2 and P3 white and black wire or red wire of the female connector on the main wiring harness when the ON OFF switch is in the upper position Connect the brewerto the power source The indication must be a 120 volts acforthree wire 120 208 volt 120 240 volt 380 volt models and 208 or 240 volts ac for four wire 440 volt models b 208 volts ac for two and three wire 208 volt models C 240 volts ac for two and three wire 240 volt models d 230 volts ac for two wire 230 volt CE models 4 Disconnect the brewer from the power source If voltage is present as described proceed to 5 Ifvoltageis not presentas described refertothe Wiring Diagrams and check the brewer wiring harness 10060 080900 SERVICE cont TIMER Early Models cont 5 With a voltmeter check the voltage across the sockets P1 and P2 blue and white wires of the female connector on the main harness when the ON OFF switch is in the ON upper position and the start switch pressed Connect the brewer to the power source The indication must be 120 volts ac for three wire 120 208 volt 120 240 volt 380 volt models and 208 or 240 volt ac for four wire 440 volt models b 208 volts ac for two and three wire 208 volt models C 240 volts ac for two and three wire 240 volt models d 230 volts ac for two wire 230 volt CE models
53. te time for filling manually is 3 minutes CAUTION Never leave brewer unattended while manually filling tank 2 Connect the brewer to the power source Turn ON OFF switch to the ON position Water should finish filling tank automatically NOTE It is recommended that the ON OFF switch be left in the OFF position at the end of the operating day or when unattended for a long period of time 3 Disconnect the brewer from the power source Remove front cupola cover for access to thermostat knob and timer On some brewers the thermostat knob is located on the front of the cupola cover 4 Turn the thermostat knob clockwise to an approximate 5 o clock position Allow 1 1 2 hours for water to heat Time will vary with incoming water temperature 5 On initial warm up some water may flow thru the overflow spigot due to expansion of the cold water in the tank This will not recur during the use of the brewer and may be avoided on the initial warm up by drawing off 1 2 gallon decanters of water each 15 minutes till brewing temperature is reached Page 5 10060 102808 INITIAL SETUP cont 6 Brewing cycles may be started whenever water temperature is correct This condition is indicated by the dial thermometer on front of the brewer Whenever the pointer is in the green brewer is ready for brewing The recommended brewing temperature is approximately 200 F 93 C Water temperature may be increased by turning thermostat knob clockwise dec
54. th Care 12593 0000 HOT SURFACES 12555 0000 This equipment must be installed to comply with the International Plumbing Code of the International Code Council and the Food Code Manual of the Food and Drug Adminis tration FDA For models installed outside the U S A comply with the applicable Plumbing Sanitation Code 00656 0000 To reduce the risk of electric shock do not remove or open cover No user serviceable parts inside Authorized service personnel only Disconnect power before servicing 37881 0000 A WARNING REMOVE FUNNEL SLOWLY 03408 0000 HOT LIQUID 03409 0000 ATTENTION TURN OFF WHEN UNATTENDED 00878 0000 YT 100824 0001 10060 011708 3 ELECTRICAL REQUIREMENTS CAUTION The brewer must be disconnected from the power source until specified in Initial Set Up 120V A C 208 OR 240V A C L1 BLACK P1841 P1843 93 amp U38 requires 3 wire grounded service rated U333 amp U3833 requires 3 wire grounded service 120 208 or 120 240 volts ac U3 30 amp U38 40 amp rated 240 volt ac 35 amp or 440 volts ac 30 amp for single phase 60 Hz Proceed as follows U333 three phase 60 Hz or 380 volts ac 30 amp for U3833 three phase 50 Hz Proceed as follows L1 L2 L3 are the 3 phases V1 Phase to phase voltage between any 2 phases V2 Phase t
55. wer remembers this volume and will continue to brew batches of this size until the volume setting procedure is repeated NOTE When brewing coffee batch volumes will decrease due to absorption by the coffee grounds NOTE HALF BATCH AND FULL BATCH SETTINGS MUST EACH BE SET SEPARATELY 3 Setting programming disable feature If it becomes necessary to prevent anyone from changing brew times once programmed you can set the SET LOCK switch to the LOCK position This will prevent any program ming to be done until switch is once again placed in the SET position Page 6 10060 080900 COFFEE BREWING 1 Brewing cycles may be started whenever water temperature is correct This condition is indicated by the dial thermometer on front of the brewer Whenever the pointer is in the green brewer is ready for brewing 2 Insert Bunn filter in funnel and add desired amount of coffee 3 Level the bed of coffee and place funnel into the funnel support Place funnel cover over the funnel and be sure the water swing spout is over the center of the funnel cover 4 Turn ON OFF switch to the ON position 5 Pushand release START switch to start the brew cycle 6 Water swing spout should not be moved as long as water is flowing into the funnel cover When water stops flowing it may then be moved for access to brewing funnel 7 Remove funnel cover Funnel should not be removed from brewer until drip out of coffee has been com pleted 8
56. wo 78 32 screws securing the level probe to the component bracket 11 Gently pullthe probe out of the component bracket and inspect for corrosion Replace if necessary 12 Place the probe so that neither end is in contact with any metal surface of the brewer 13 Connect the brewer to the power source Check the voltage across terminals 1 and 3 refer to chart below There is an approximate delay of five seconds for output to stabilize Model Voltage Voltage Jumper Jumper Not Touching Touching Frame Frame 120 208V amp 120V 0 120 240V 3 wire w ground single phase 230V 2 wire 230V 0 w ground single phase 208V or 240V 208V or 0 2 wire wground 240V 0 single phase 280V or 440V 220V or 0 4 wire w ground 254V 0 3 phase 380V 3 wire 120V 0 w ground 3 phase w stepdown trans former Page 21 14 Disconnect the brewer from the power source If voltage is present as described reinstall the level probe the liquid level board and level probe are op erating properly If voltage is not present as described check the pink wire on the level probe from liquid level board terminal 4 Removal and Replacement 1 Remove all wires from the liquid level board 2 Removethe 710 32 screw and flat washer securing the protective shield to the component bracket 3 Remove the 710 32 screw and internal tooth lockwasher securing the liquid level board to the component bracket Remove liquid level board
Download Pdf Manuals
Related Search