Buffalo Technology HD-HC320U2 Computer Drive User Manual
Contents
1. OL c z lt NO JUMPER x Early H5E H5X H10X FR Install jumper thru ver 1 04 EBE STATIC FE SHIELD TII en em NOTE no jumper used on any H ERE o Model starting with ver 1 08 H 2 H E 200V AC 2 WIRE GND X 39333 0002A 12 12 SINGLE PHASE Pr gt 2006 2 BUNN O MATIC CORPORATION rrr 21 42311 121312 SCHEMATIC WIRING DIAGRAM H10X GRN L1 L2 or N Earth Ground MAIN ON OFF SWITCH Late Models only ee Chassis Ground BLK 18 BLK 14 BLK 14 WHI VIO 14 LIMIT THERMOSTAT BLK 14 BLK 14 BLU 14 TANK HEATER LIMIT THERMOSTAT BLK 14 am BLK 14 h BLU 14 OVERFLOW PROTECTION SWITCH RED RED BLK 18 PINK 22 RED 18 or WHI 18 GRN 18 WHI BLU 18 sou CONTROL BOARD USED ON ONLY FACTORY _ I RS 0 3 3VDC 4 1 F NU Install jumper thru ver 1 04 po e REFILL power 200 240 VOLTS Model starting with ver 1 08 2 WIRE GND a eres SINGLE PHASE WHI 24 22 aE 0 13 8VAC allel E Early H5E H5X H10X NOTE no jumper used on any 40707 0000C 09 09 2008 BUNN O MATIC CORPORATION 22 42311 071310 SCHEMATIC WIRING DIAGRAM H5E H5X GRN L1 L2 or N Earth Gro2. H10X HSX HSE DV PC ELEMENT With Digital Control Board SERVICE MANUAL BUNN O MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD ILLINOIS 62708 3227 PHONE 217 529 6601 FAX 217 529 6644 To ensure you have the latest revision of the manual or to obtain the illustrated parts catalog please visit www bunn com 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 Contact Bunn O Matic Corporation at 1 800 286 6070 to obtain a paper copy of the required Illustrated Parts Catalog mailed via U S Postal Service 42311 0000E 09 13 2011 BUNN O MATIC CORPORATION BUNN O MATIC COMMERCIAL PRODUCT WARRANTY Bunn O Matic Corp BUNN warrants equipment manufactured by it as follows 1 Airpots thermal carafes decanters GPR servers iced tea coffee dispensers MCP MCA pod brewers thermal servers and Thermofresh servers mechanical and digital 1 year parts and 1 year labor 2 All other equipment 2 years parts and 1 year labor plus added warranties as specified below a Electronic circuit and or control boards parts and labor for 3 years b Compressors on refrigeration equipment 5 years parts and 1 year labor Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis parts and labor for 4 years or 40 000 pounds of coffee whichever comes
3. LIMIT LIMIT THERMOSTAT THERMOSTAT ELE TANK HEATER TELE BLK 14 BLK 14 BLU 14 BLU 14 I I 4000 W eS e REFILL OVERFLOW WHI BLU 18 230VAC PROTECTION SWITCH RED 18 ue vow 2 VI0 18 230VAC 501 MAIN CONTROL BOARD PINK 22 USED ON H5X ONLY FACTORY J1 1 O O O O O or eo Se lt J c c gt le m Hl Ol BLK 24 WHI 24 0 13 8VAC J3 1 1 1 5 c 2 lt NO JUMPER x Early H5E H5X H10X 5 Install jumper thru ver 1 04 STATIC gt m SHIELD maa a 2 S NOTE no jumper used on any HE SEE o Model starting with ver 1 08 El 2 rT E 230V 2 WIRE GND 39333 0001C 10 09 SINGLE PHASE 2006 BUNN O MATIC CORPORATION 20 42311 071310 SCHEMATIC WIRING DIAGRAM LI L2orN TERMINAL BLOCK H5 PC 200V GRN YEL BLK RED Earth Ground MASTER ON OFF SWITCH Chassis Ground A i 7 BRN WHI BLU BLK gt FF SUPPRESSION L hd CAPACITOR EMI FILTER ERE WHI BLU TANK HEATER THERMOSTAT BLU RED REFILL DISPENSE OVERFLOW PROTECTION SWITCH TAN VIO WHI RED MAIN CONTROL BOARD USED ON H5X ONLY FACTORY J J3 1 1 L H5 PC 1 ooooo 9 of oO lt Oo C2 c P Hf BLK 24 WHI 24 0 13 8VAC
4. 17b LOCATION Test Procedure 1 Disconnect the dispenser from the power source 2 Disconnect the thermistor from J5 on control board 3 Check the resistance across thermistor with a ohmmeter The resistance range is approximately 9KN room temperature to approximately 2 200 F 4 Disconnect the dispenser from the power source If resistance was present as described the thermistor is working If resistance was not present as described replace the control board 17 Removal and Replacement 1 Disconnect the dispenser from the power source 2 pare the thermistor from J5 on control board 3 Loosen the set screw and the two screws securing the two half blocks together Remove thermistor assembly from overflow tube 4 Install new thermistor on tube and slide down until it contacts the flared end NOTE It s critical that the thermistor be centered directly under the tube opening 5 Snug the set screw so the block assembly does not move aroung easily 6 Connect the thermistor to J5 on control board NOTE DO NOT TEST OPERATION WITH PANELS REMOVED AS AIR MOVEMENT CAN HINDER PROPER READINGS ON THERMISTOR Mounting screws DO NOT BEND THERMISTOR S UP DOWN FIG 17c STEAM SENSOR EXPLODED Thermistor centered under tube opening FIG 17d THERMISTOR POSITION 42311 080510 SERVICE cont Dispense Valve PC Only Location The Dispense Valve is lo
5. Disconnect the dispenser from the power source and turn off the water supply to the dispenser 2 Remove the pink wire from terminal 5 of the elec tronic control board 3 Check the voltage across the solenoid valve coil terminals with a voltmeter Connect the dispenser to the power source The indication must be a 100 to 120 volts ac for 100 to 120 volt models or b 200 to 240 volts ac for 200 to 240 volt models or c 230 volts ac for 230 volt models after a delay of approximately 5 seconds 4 Disconnect the dispenser from the power source If voltage was present as described proceed to 5 If voltage was not present as described refer to the Wir ing Diagrams and check the dispenser wiring harness 5 Remove both wires from the solenoid valve coil terminals 6 Check for continuity across the solenoid valve coil terminals If continuity is present as described reconnect the wires and proceed to 77 If continuity is not present as described replace the solenoid valve coil 7 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 14 sound after approximately 5 seconds as the coil magnet attracts the plunger 8 Disconnect the dispenser from the power source 9 Reconnect the pink wire to terminal 5 of the elec tronic control board If the sound was heard as described and water will not pass through the
6. are located on the side of the dispenser Access Is gained by removing the side panel The panel is attached with eight 8 32 slotted head screws 42311 022311 SERVICE Liquid Level Control Flow Charts Electronic Controls H5E H5X LIQUID LEVEL CONTROL PROBLEM Does Not Refill Remove Power Does Water Flow No Replace Solenoid Valve Replace Probe P4093 35 FIG 8a ELECTRONIC CONTROL Voltage present at Solenoid Valve Replace Ready Lamp Replace Control Board M M N NANN Wr Wd ws e NM Triac Assy H5E H5X LIQUID LEVEL CONTROL j ve A ee v O r m O lt o Drain cup Unplug Ready Lamp Electronic Control Board Retry No Replace Ready Lamp od o FIG 8b ELECTRONIC CONTROL BOARD AND TRIAC Location The electronic control board is located inside the Cu rear of the dispenser Access will also be needed to the temperature sensor overflow tube temperature sensor and liquid level probe located on the tank lid Ii UE 1 i General This system controls the liquid level and water Soe temperature of the dispenser These two functions 4 act independently of each other and should be tested Separately 8 42311 071310 SERVICE cont Electronic Controls cont Liquid
7. 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 non periodic cleaning and descaling equipment failures related to poor water quality damage or casualty In addition the warranty does not apply to replacement of items subject to normal use including but not limited to user replaceable parts such as seals and gaskets This warranty is conditioned on the Buyer 1 giving BUNN prompt notice of any claim to be made under this warranty by telephone at 217 529 6601 or by writing to Post Office Box 3221 Springfield Illinois 62708 3227 2 if requested by BUNN shipping the defective equipment prepaid to an authorized BUNN service location and 3 receiving prior authorization from BUNN that the defective equipment is under warranty THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY WRITTEN OR ORAL EX PRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF EITHER MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE The agents dealers or employees of BUNN are
8. not present as described replace the tank heater 16 4 Remove the tank heater from the tank lid and in spect it for cracks in the sheath If the sheath shows no sign of damage proceed to 75 If the sheath is damaged replace the tank heater Check for continuity across the tank heater termi nals If continuity is present as described reinstall the tank heater The tank heater is operating properly If continuity is not present as described replace the tank heater Removal and Replacement E d M BLU to Control Board Relay Remove the wires to the tank heater Remove the 8 32 nuts from the tank heater flange Remove the tank heater Inspect the tank heater gasket and replace if neces securely install the new tank heater Be certain of a watertight seal Reconnect the wires FIG 10 BLK to Limit Thermostat FIG 16 TANK HEATER WIRING HEATER 1800W 120V 4000W 240V 4000W 208V RESISTANCE 7440 8 6 0 13 420 15 510 10 09 0 11 99 0 6000W 240V 0 00 0 10 23 0 6000W 208V 66 0 7 700 TERMINAL TO SHEATH INFINITE OPEN 42311 071310 SERVICE cont Steam Sensor Thermistor Location The thermistor is located on the end of the overflow tube above the overflow cup To test the thermistor access will also be needed to the electronic control board H 5X FIG 17a LOCATION FIG
9. 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 dispenser is heated at all times Keep away from combustibles WARNING e Exercise extreme caution when servicing electrical equipment e Disconnect dispenser from the power source when servicing except when electrical tests are specified e Follow recommended service procedures e Replace all protective shields or safety notices When a fault occurs failure to the unit the POWER lamp will flash to identify the problem early models FAULT CODES Flashes Description of Failure Er Temperature Sensor short 1 Temperature Sensor short Er2 Temperature Sensor open 2 Temperature Sensor open Er3 Refill Fault continuous refill for 15 minutes 3 Refill Fault continuous refill for 15 minutes Er4 Heater Fault heater relay on for 120 minutes 4 Heater Fault heater relay on for 120 minutes Ero Boil Thermistor short HoX H10X only 5 Boil Thermistor short HSX H10X only Er6 Boil Thermistor open H5X H10X only 6 Boil Thermistor open H5X H10X only Problem Probable Cause Remedy Equipment will not operate 1 No power or incorrect voltage A Check the terminal block for the cor rect voltage It should be
10. the top cover shroud and bracket Disconnect wires from the valve Using a back up wrench to hold fitting in place Remove the valve Wrap threads of fitting with Teflon tape and install new valve Install bracket nut flare nut wires and covers FIG 18b VALVE REMOVAL REPAIR KIT FIG 18c VALVE REPAIR KIT 42311 071310 L1 N L2 BLK 14 RED 14 N UN GRN Earth Ground MASTER ON OFF SWITCH JE Mu j Chassis Ground BLK 18 RED 14 EU SWITCH TANK HEATER THERMOSTAT SII IV BRN 14 BLK 14 12 V BLK 14 T7 1 1 WHI VIO 14 la Vg a WHT 14 amunununum m m 1800 W 1 REFILL 7 OVERFLOW WHI BLU 18 120VAC sot WHT 18 peoreorionswron 18 120VAC DISPENSE MAIN CONTROL BOARD PINK 22 USED ON H5X ONLY FACTORY J J3 1 1 1 H5 PC 1 120 240V AC 3 WIRE GND SINGLE PHASE NO JUMPER x Early 5 H5X H10X 2 Install jumper thru ver 1 04 EEE UP SLE Eili NOTE no jumper used on any FE Model starting with ver 1 08 EIE 120V AC 2 WIRE GND H E 120 208V AC 3 WIRE GND m 19 SCHEMATIC WIRING DIAGRAM HSE DV PC 39333 0000D 09 09 2006 BUNN O MATIC CORPORATION 42311 071310 1 12 SCHEMATIC WIRING DIAGRAM H5E PG GRN Bu RED 14 Earth Ground EM FILTER 9 9 5 Chassis Ground BLK 18 RED 14
11. 1310 SERVICE WARNING Disconnect the dispenser from the power source before the removal of any panel or the replacement of any component WARNING Inspection testing and repair of electrical equipment should be performed only by qualified service personnel Disconnect the dispenser fromthe power source when servicing except when electrical tests are required and the test procedure specifically states to connect the dispenser to the power source Component Access H5E DV PC X P1770 30 The check valve electronic control assembly safety overflow switch solenoid valve overflow tube tempera ture sensor and terminal block are located at the rear of the dispenser Access is gained by removing the upper and lower rear panels The upper is attached with six 8 32 slotted head screws The lower is attached with four 8 32 slotted head screws The middle panel must not be removed from the dispenser Faceplate Removal H5 ELEMENT After removing top cover remove the two upper screws securing the faceplate Carefully lift faceplate straight up until the three lower screws clear the key holes 7 Component Access H10X MAMMALIA DPA d SS RS 5 MS cS i us 2 2 Tos SS SS Tu S ES 878 30 The check valve electronic control assembly over flow protection switch solenoid valve overflow tube temperature sensor triac assembly EARLY MODELS ONLY and terminal block
12. CORPORATION 24 42311 050511 SCHEMATIC WIRING DIAGRAM H5 ELEMENT GRN or GRN YEL L1 L20rN Earth Ground TERMINAL BLOCK Chassis Ground MASTER ON OFF SWITCH BLK BRN BLK WHI BLU TANK HEATER THERMOSTAT BLU OVERFLOW PROTECTION SWITCH T CONTROL DISPLAY STEAM SENSOR USED ON H5X ONLY 29 TEMP PROBE REFILL PROBE 44657 0000B 05 11 2011 100 240V AC 2 WIRE GND BUNN O MATIC CORPORATION SINGLE PHASE 42311 050511
13. Level Control Test Procedure 1 Disconnect the dispenser from the power source 2 Check the voltage across terminals 3 amp 4 of the electronic control board with a voltmeter Connect the dispenser to the power source The indication must be a 100 to 120 volts ac for 100 to 120 volt models or b 200 to 240 volts ac for 200 to 240 volt models or 230 volts ac for 230 volt models 3 Disconnect the dispenser from the power source If voltage was present as described proceed to 4 If voltage was not present as described refer to the Wiring Diagrams and check the dispenser wiring harness Temperature Control Flow Charts H5X THERMOSTAT PROBLEM Water Not Hot Enough Reposition Jumper Replace Steam Sensor Red Light On Constantly Recheck Water Temperature o Replace Control Assembly Replace Tank Heater Replace Limit Thermostat Replace Control Assembly Measure Voltage At Tank Heater Replace Triac Check For Split Tank Heater Reinstall Original Control Assembl Voltage Present Recheck Water Temperature 4 Remove the pink wire from terminal 5 of the elec tronic control assembly 5 Check the voltage across terminals 1 amp 4 of the electronic control board with a voltmeter Connect the dispenser to the power source The indication must be 100 to 120 volts ac for 100 to 120 voltmodels or b 200 to 240 volts ac for 200 to 240 volt models or 230 volts ac for 230
14. a 100 to 120 volts ac across the black and white terminals for 100 to 120 volt models or b 200 to 240 volts ac across the red and black terminals for 200 to 240 volt models Or c 230 volts ac across the red and black terminals for 230 volt models B Check circuit breakers or fuses 4 42311 071310 TROUBLESHOOTING cont Problem Equipment will not operate cont Automatic refill will not oper ate after drawing hot water Water flows into the tank con tinuously Dispenser discon nected from power source Water flows into the tank con tinuously Dispenser connect ed to power source Water is cold Probable Cause 2 1 safety overflow switch No water Water strainer flow control Liquid level system Solenoid valve Solenoid valve Liquid level system Safety overflow switch Limit thermostat Remedy Refer to Service safety overflow switch for testing procedures Check plumbing and shut off valves A Direction of flow arrow must be point ing towards dispenser B Remove the strainer flow control and check for obstructions Clear or replace Refer to Service electronic controls for testing procedures Refer to Service solenoid valve for test ing procedures Refer to Service solenoid valve for test ing procedures Refer to Service electronic controls for testing procedures Refer to Service safe
15. cated behind control panel Dispense valve Nut Flare nut FIG 18a DISPENSE VALVE Test Procedures 1 Check the valve for coil action Turn on the valve with the dispense button Listen carefully in the vicinity of the dispense valve for a click as the coil pulls the plunger in If no sound is heard as described proceed to 2 If the sound is heard as described there may be a blockage in the valve Disconnect the dispenser from the power source Remove the valve and inspect for blockage and de lime all related areas 2 Connect voltmeter leads to the coil terminals Turn on the valve with the dispense button NOTE Due to the internally rectified coil the indication will be 120VAC all the time Set the meter to DC volts The indication should be 170VDC when activated If the polarity of meter leads are reversed reading will indicate 170VDC Double these readings for 240 volt coils If voltage is present as described but no coil action is observed valve is defective Replace valve and test again to verify repair 18 If voltage is not present as described refer to Wir ing Diagrams and check the dispenser wiring harness Also check the control board for proper operation Removal and Replacement Disconnect the dispenser from the power source and allow to cool Drain enough water from the tank so the water level is below the outlet Remove the nut and flare nut from the valve Remove
16. e If voltage was present as described the temperature control of the system is operating properly Return the new electronic control board or temperature sensor to Bunn O Matic for credit Electronic Controls Removal and Replacement 1 Removeall wires from the electronic control board terminals 2 Removethe six 6 32 screws holding the electronic control board to the component bracket 3 Disconnect the temperature sensor overflow tube temperature sensor and indicator wires from the electronic control board 4 Attach the temperature sensor overflow tube temperature sensor and indicator wires to the electronic control assembly 5 Fasten the new electronic control board to its bracket 6 Referto Fig 2 when reconnecting the wires 7 Review the initial set up procedures on page 6 11 T5 PNK to Liquid Level Probe T4 WHI or RED to ao Terminal Block gt BLK to Overflow Safety Switch T2 GRN or GRN YEL to Chassis Ground T1 WHI BLU to Solenoid BLU to Tank Heater WHI VIO to Terminal Block J5 GRY amp GRY toTherm istor H5X only J4 BLK amp WHI to Temperature Sensor J3 PNK amp GRY to Heater Indicator Refill Indicator Power Indicator Ready Indicator FIG 11a WIRING CONNECTIONS Adjustments The H5X H10X dispensers hold the water tempera ture at the threshold of boiling It is not adjustable by the user The H5E dispenser i
17. e dispenser from the power source If voltage was present as described reconnect the black wire and proceed to 75 If voltage was not present as described refer to the Wir ing Diagrams and check the dispenser wiring harness 5 Check for continuity across the terminals of the limit thermostat If continuity is not present as described the circuit is broken Press the reset button of the limit thermostat and recheck for continuity If continuity is not present as described replace the limit thermostat Removal and Replacement 1 Remove both wires from the limit thermostat ter minals 2 Remove the two 710 32 nuts attaching the limit thermostat to the top of the tank 3 Install the new limit thermostat and secure into place with two 10 32 nuts 4 Referto FlG 4 when reconnecting the wires BLK to Terminal Block BLK to Tank Heater FIG 12c LIMIT THERMOSTAT WIRING 42311 071310 SERVICE cont Safety Overflow Switch H 10 P1993 FIG 130 OVERFLOW PROTECTION SWITCH Location The safety overflow switch is located inside the rear of the dispenser inside the copper overflow cup For testing or removal of the safety overflow switch access may also be needed by removing the two screws attaching the electronic control assembly to its mount ing bracket Test Procedure 1 Once voltage is verified at the power source check for continuity across the safety overflow sw
18. for 100 to 120 volt models or b 200 to 240 volts ac for 200 to 240 volt models or c 230 volts ac for 230 volt models after a delay of approximately 5 seconds Touch the screw head end of the probe to the dis penser housing The indication must be 0 Move the probe away from the dispenser housing The indication must again be a 100 to 120 volts ac for 100 to 120 volt models or b 200 to 240 volts ac for 200 to 240 volt models or 230 volts ac for 230 volt models after a delay of approximately 5 seconds Disconnect the dispenser from the power source Temperature Control Flow Charts cont If voltage was present as described reinstall the probe the sensing function of the system is operating properly H5X THERMOSTAT PROBLEM Boils Excessively Fills Cup Disconnect Blue Wire From Red Light On While Boiling Replace Control Assembly Control Board Pin 7 Still Boiling Yes Replace Triac Assembly Check For Split Replace Control Board If voltage was not present as described check the pink probe wire and the green ground wire for continuity and or replace the probe Temperature Control Test Procedure 1 Disconnect the dispenser from the power source 2 Check the voltage across terminals 3 amp 4 of the electronic control circuit board with a voltmeter Connect the dispenser to the power source The indication must be a 100 to 120 vol
19. he test procedure specifically states to connect the dispenser to the power source CONTENTS TOU FESO OUI uu uy 4 OOINDOIHBIUEF ACDBSS VOC OIC CONIO S ds idR 0 11 LIEU EBeTITIOS EO D asen E 12 Safet Overflow WIFE sessi ince 13 Solenoid Valve 14 Solenoid Valve Early Models uuu uu uM ais m 15 16 S I I 01 17 Dispense EA do 18 Schematic Wiring 19 3 42311 071310 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 120 240 volt ac and low voltage dc potential on their terminals Shorting of terminals or the application of external voltages may result in board failure Intermittent operation of electronic circuit boards is unlikely Board failure will normally be permanent If an intermittent condition is encountered the cause will likely be a switch contact or a loose connection at a terminal or crimp solenoid removal requires interrupting the water supply to the valve Damage may result if
20. itch red wires only until the plastic float is raised and check that continuity returns when the plastic float is again lowered If continuity is present as described reconnect each of the red wires to the black wires the safety overflow switch is operating properly If continuity is not present as described replace the safety overflow switch 13 Removal and Replacement 1 Disconnect the black wires from the safety overflow switch 2 Remove the nut beneath the copper overflow cup 3 Remove the entire switch assembly from the cup 4 Placethe new switch assembly into the cup wires first Make sure that a gasket is in place around the threaded switch stem NOTE The magnets must be at the top of the float and there must be NO stainless steel washers installed for the safety overflow switch to operate properly 5 Install the nut beneath the copper overflow cup Be sure not to overtighten 6 Reconnect the wires FlG 6 RED to BLK Wire from ML NN Terminal Block RED to BLK Wire from Efe 1 tronic Control 3 FIG 13c SAFETY OVERFLOW WIRING 42311 071310 SERVICE cont Solenoid Valve Late Models Location The solenoid valve is located inside the rear of the dispenser on the right side near the bottom To test the solenoid valve access will also be needed to the electronic control board P1778 FIG 14a SOLENOID VALVE Test Procedure 1
21. ly Gourmet BUNN Gourmet BUNN Pour O Matic BUNN BUNN with the stylized red line BUNNlink Bunn OMatic Bunn O Matic BUNNserve BUNNSERVE with the stylized wrench design Cool Froth DBC Dr Brew stylized Dr design Dual Easy Pour EasyClear EasyGard FlavorGard Gourmet Ice Gourmet Juice High Intensity iMIX Infusion Series Intellisteam My Caf Phase Brew PowerLogic Quality Beverage Equipment Worldwide Respect Earth Respect Earth with the stylized leaf and coffee cherry design Safety Fresh savemycoffee com scale Pro Silver Series Single Smart Funnel Smart Hopper SmartWAVE Soft Heat SplashGard The Mark of Quality in Beverage Equipment Worldwide ThermoFresh Titan trifecta Velocity Brew Air Brew Beverage Bar Creator Beverage Profit Calculator Brew better not bitter BUNNSource Coffee At Its Best Cyclonic Heating System Daypart Digital Brew er Control Element Milk Texturing Fusion Nothing Brews Like a BUNN Pouring Profits Signature Series Sure Tamp Tea At Its Best The Horizontal Red Line Ultra are either trademarks or registered trademarks of Bunn O Matic Corporation The commercial trifecta brewer housing configuration is a trademark of Bunn O Matic Corporation 2 42311 070913 WARNING Inspection testing and repair of electrical equipment should be performed only by qualified service personnel Disconnect the dispenser fromthe power source when servicing except when electrical tests are required and t
22. not authorized to make modifications to this warranty or to make additional warranties that are binding on BUNN Accordingly statements by such individuals whether oral or written do not constitute warranties and should not be relied upon If BUNN determines in its sole discretion that the equipment does not conform to the warranty BUNN at its exclusive op tion while the equipment is under warranty shall either 1 provide 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 OF THIS EQUIPMENT WHETHER DERIVED FROM WARRANTY OR OTHERWISE SHALL BE LIMITED AT BUNN S SOLE OPTION AS SPECIFIED HEREIN TO REPAIR REPLACEMENT OR REFUND In no event shall BUNN be liable for any other damage or loss including but not limited to lost profits lost sales loss of use of equipment claims of Buyer s customers cost of capital cost of down time cost of substitute equipment facilities or services or any other special incidental or consequential damages 392 A Partner You Can Count On Air Infusion AutoPOD AXIOM BrewLOGIC BrewMETER Brew Better Not Bitter Brew WISE BrewWIZARD BUNN Espress BUNN Fami
23. om the solenoid valve coil Turn off the water supply to the dispenser the water lines to and from the solenoid valve Remove the two 8 32 slotted head screws holding the solenoid valve and mounting bracket to the component bracket Lift out the solenoid valve Remove the two 10 32 slotted head screws holding the solenoid valve to its mounting bracket 7 Securely install the new solenoid valve to its mount ing bracket The direction of flow arrow must be pointing towards the tank lid 8 Attach the solenoid valve and mounting bracket to the component bracket 9 Securely fasten the water lines to and from the Solenoid valve 10 Reconnect the wires FIG 8 MISES o WHI BLU to Contol Board T1 ___RED to Terminal Block RED to Control Board T4 S FIG 15b SOLENOID VALVE WIRING 42311 071310 SERVICE cont Tank Heater Location The tank heater is located in the tank lid FIG 16b TANK HEATER Test Procedure 1 2 3 Disconnect the dispenser from the power source Check the voltage across the terminals of the tank heater with a voltmeter Connect the dispenser to the power source The indication must be a 100 to 120 volts ac for 100 to 120 volt models or b 200 to 240 volts ac for 200 to 240 volt models or 230 volts ac for 230 volt models Disconnect the dispenser from the power source If voltage is present as described proceed to 4 If voltage is
24. s factory calibrated for the temperature specified on the data plate If adjustment is required use the following procedure 1 Fillthe dispenser according to the steps in the Initial Set up 2 Take the temperature of the stream of water im mediately below the faucet as it flows from the dispenser with an accurate thermometer Do not take the temperature of water collected in a con tainer 3 If any adjustment is required refer to LEVEL 1 PROGRAMMING in the Operating Manual 42311 071310 SERVICE cont Limit Thermostat Location The limit thermostat is located on the tank lid To test the limit thermostat access will also be needed to the terminal block located at the rear of the dispenser FIG 12b LIMIT THERMOSTAT Test Procedure 1 Disconnect the dispenser from the power source 2 There are two black wires on the limit thermostat terminals One comes from the terminal block The other goes directly to the tank heater terminal Re move the black wire at the limit thermostat coming from the terminal block 3 Check the voltage across the black wire removed from the limit thermostat and the white wire or red wire of the terminal block with a voltmeter Connect the dispenser to the power source The indication must be a 100 to 120 volts ac for 100 to 120 volt models or b 200 to 240 volts ac for 200 to 240 volt models or 230 volts ac for 230 volt models 4 Disconnect th
25. solenoid valve there may be a blockage in the water line before or after the solenoid valve or the solenoid valve may require inspection for wear and removal of waterborne particles If the sound was not heard as described replace the solenoid valve Removal and Replacement Remove all wires from the solenoid valve coil Turn off the water supply to the dispenser Disconnect the water line from the solenoid valve Remove the two 8 32 slotted head screws holding the solenoid valve and mounting bracket to the back panel Lift out the solenoid valve securely install the new solenoid valve to the back panel securely fasten the water line to the solenoid valve Reconnect the wires FIG 8 a i 252 WHI BLU to Electronic Contre Board 1 E LZ 5 WHI or RED to Terminal Block FIG 14b SOLENOID VALVE WIRING 42311 071310 SERVICE cont Solenoid Valve Early Models Location The solenoid valve is located behind the large access panel on the left side of the dispenser To test the solenoid valve access will also be needed to the electronic control board H 10 Pd P1994 FIG 15a SOLENOID VALVE Test Procedure 1 Disconnect the dispenser from the power source and turn off the water supply to the dispenser 2 Remove the pink wire from terminal 5 of the elec tronic control board 3 Check the voltage across
26. the solenoid valve coil terminals with a voltmeter Connect the dispenser to the power source The indication must be 200 to 240 volts ac for 200 to 240 volt models after a delay of approximately 5 seconds 4 Disconnect the dispenser from the power source If voltage was present as described proceed to 5 If voltage was not present as described refer to the Wir ing Diagrams and check the dispenser wiring harness 5 Remove both wires from the solenoid valve coil terminals 6 Check for continuity across the solenoid valve coil terminals 15 If continuity is present as described reconnect the wires and proceed to 7 If continuity is not present as described replace the solenoid valve coil 7 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 after approximately 5 seconds as the coil magnet attracts the plunger 0 Disconnect the dispenser from the power source 9 Reconnect the pink wire to terminal 5 of the elec tronic control board If the sound was heard as described and water will not pass through the solenoid valve there may be a blockage in the water line before or after the solenoid valve or the solenoid valve may require inspection for wear and removal of waterborne particles If the sound was not heard as described replace the solenoid valve Removal and Replacement Remove all wires fr
27. ts ac for 100 to 120 volt models or b 200 to 240 volts ac for 200 to 240 volt models or 230 volts ac for 230 volt models Disconnect the dispenser from the power source Check the voltage across the tank heater terminals with a voltmeter Connect the dispenser to the power source The indication must be a 100 to 120 volts ac for 100 to 120 volt models or b 200 to 240 volts ac for 200 to 240 volt models or 230 volts ac for 230 volt models 5 Disconnect the dispenser from the power source UR as H5E THERMOSTAT PROBLEM Boils Replace Control Assembly Disconnect Blue Wire From Control Board Pin 7 Still Boiling Yes Replace Triac Assembly Check For Split No Tank Heater Replace Control Board 42311 071310 SERVICE cont Electronic Controls cont If voltage was present as described the temperature control of the system is operating properly If voltage was not present as described contact Bunn O Matic to order an electronic control board and temperature sensor for evaluation and proceed to 79 6 Replace the electronic control board 7 Check the voltage across the tank heater terminals with a voltmeter Connect the dispenser to the power source The indication must be a 100 to 120 volts ac for 100 to 120 volt models or b 200 to 240 volts ac for 200 to 240 volt models or 230 volts ac for 230 volt models 8 Disconnect the dispenser from the power sourc
28. ty overflow switch for testing procedures Refer to Service limit thermostat for testing procedures CAUTION Do not eliminate or bypass limit thermostat Use only B O M replacement part 23717 0003 3 Tank heater 4 Temperature control Refer to Service tank heater for testing procedures Refer to Service electronic controls for testing procedures 42311 071310 TROUBLESHOOTING cont Problem Water boils continuously Probable Cause 1 Temperature control 2 Lime build up Remedy Refer to Service electronic controls for testing procedures Inspect the tank assembliy for excess lime deposits Delime as required CAUTION Tanks and tank components should be delimed reglarly depending on local water conditions Exces Sive mineral build up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks Dispenser is making unusual noises Ready indicator will not light 1 Plumbing lines 3 Water supply 1 Temperature control 2 Ready Indicator LED Plumbing lines should not be resting on the counter top A The dispenser must be connected to a cold water line B Water pressure to the dispenser must not be higher than 90 psi 620 kPa Install a regulator if necessary to lower the work ing pressure to approximately 50 psi 345 kPa Refer to Service electronic controls for testing procedures Replace the indicator LED 42311 07
29. und MAIN ON OFF SWITCH Late Models only Chassis Ground LIMIT THERMOSTAT BLK 14 14 BLU 14 l l m TANK HEATER OVERFLOW PROTECTION SWITCH RED RED BLK 18 WHINIO 14 PINK 22 RED 18 or WHI 18 WHI BLU 18 so MAIN CONTROL BOARD USED ON H5X ONLY FACTORY 7 9 S 0 3 3vpc 941 et WHI 24 03 1 m ER 0 13 8VAC NO JUMPER 100 120 VOLTS AC Ol c 2 lt Early H5E H5X H10X Install jumper thru ver 1 04 p REFILL POWER NOTE no jumper used on any or Model starting with ver 1 08 200 240 VOLTS AC e c LL E 2 WIRE GND 42375 0000A 09 09 2009 BUNN O MATIC CORPORATION SINGLE PHASE 23 42311 071310 SCHEMATIC WIRING DIAGRAM H5XA H5EA GRN YEL L1 L2 Earth Ground Chassis Ground BLK 14 LIMIT e e LIMIT THERMOSTAT BLK 14 eee eee K 14 BLU 14 CAPRA ART Sf 4 h MC en o le f ei I RFI SUPPRESSION CAPACITOR er Zz qu BLK 18 FILTER t OVERFLOW PROTECTION p BLK 18 MAIN CONTROL BOARD USED H5X ONLY FACTORY L5 N BLK 24 WHI 24 0 13 8VAC H5 PC NO JUMPER Early H5E H5X H10X Install jumper thru ver 1 04 NOTE no jumper used on any 230 VOLTS AC Model starting with ver 1 08 2 WIRE GND SINGLE PHASE 40712 0000F 05 11 2008 BUNN O MATIC
30. volt models after a delay of approximately 5 seconds 6 Disconnect the dispenser from the power source If voltage was present as described the liquid level con trol of the system is operating properly proceed to 7 If voltage was not present as described replace the electronic control board and the temperature sensor in the tank lid SERVICE cont H5E THERMOSTAT PROBLEM Water Not Hot Enough Red Light On No Constantly Yes Measure Voltage At Tank Heater Turn Temperature Adjustment Screw Clockwise Contiuously Red Light On Adjust For Correct Water Temperature No Replace Control Assembly Replace Tank Heater Replace Limit Thermostat Replace Control Assembly Measure Voltage At Tank Heater Replace Triac Check For Split Tank Heater Reinstall Original Control Assemb Voltage Present Recheck Water Temperature 42311 071310 Electronic Controls cont 6 10 11 12 Reconnect the pink wire to terminal 5 of the elec tronic control assembly Loosen the compression fitting remove the probe from the tank lid and inspect it for mineral depos its Replace it if necessary Keep the exposed ends of the probe away from any metal surface of the dispenser Check the voltage across terminals 1 amp 4 of the elec tronic control assembly with a voltmeter Connect the dispenser to the power source The indication must be a 100 to 120 volts ac
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