Bunn G9 HD Electric Burr Grinder
Contents
1. 13 10171 042707 SERVICE cont Motor Location The motor is located in the upper wrapper under the hopper Test Procedure 1 Remove the hole plug located on the right side of the housing Press the red Reset button visible through the opening Listen carefully for a click This resets the motor protection circuit and may indicate that something other than coffee was inserted into the hopper for grinding If the grinder remains unable to start proceed to step 2 If the grinder stops operating shortly after starting refer to the removal and replacement steps to gain ac cess to the grind chamber Remove any foreign materials that may be found 2 Disconnect the grinder from the power supply 3 Remove the electrical access panel at the rear of the motor 4 Check the voltage across terminals Li amp L2 of the motor with a voltmeter when the Off On Start switch is placed in the START right position and released Connect the grinder to the power supply The indica tion must be a 120 volts ac for two wire 120 volt models b 240 volts ac for two wire 240 volt models 5 Disconnect the grinder from the power supply If voltage is present as described and the grinder remains unable to start replace the motor If voltage is not present as described refer to the Wir ing Diagrams and check the grinder wiring harness Removal and2. The Off On Start switch is centered in the housing above the upper front inspection panel Test Procedure 1 Disconnect the grinder from the power supply 2 Remove the black wire from the switch 3 Check for continuity across the black wire from the Off On Start switch and the left blade of the cordset connector see illustration below CORDSET CONNECTOR Looking Strait on Black 1 oa Ground White continuity is present as described proceed to step 4 If continuity is not present as described refer to the Wiring Diagrams and check the grinder wiring har ness 4 Remove the remaining wires from the switch 5 Check for continuity across the lower terminals when the switch is placed in both the ON center and START right positions continuity is present as described proceed to step 6 continuity is not present as described replace the switch 6 Check for continuity across the upper terminals when the switch is placed in the START right position only Page 11 continuity is present as described the Off On Start switch is operating properly continuity is not present as described replace the switch Removal and Replacement 1 Remove all wires from the switch terminals 2 Compress the clips inside the front wrapper and gently push the switch through the opening 3 Push the new switch into the opening and spread the clips to hold the switc
3. G9HD G9T HD OPERATING amp SERVICE MANUAL BUNN O MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD ILLINOIS 62708 3227 PHONE 217 529 6601 217 529 6644 To obtain the Illustrated Parts Catalog visit the Bunn O Matic website at www bunn com This is absolutely FREE and the quickest way to obtain the catalog Contact 0 Corporation at 1 800 286 6070 to obtain a paper copy of the required Illustrated Parts Catalog mailed via U S Postal Service 10171 0000M 04 07 1986 Bunn O Matic Corporation www bunn com CONTENTS Introduction 2 Warranty 2 User NOTICES 5 3 Electrical Requirements 3 Initial Set Up 3 Operating Controls 3 Cleaning 4 Coffee Grinding 4 Adjustments 4 TfOUGIESABOUNN assine 6 8 Wiring 14 INTRODUCTION This equipment will store up to nine pounds of who
4. position B Refer to Service Off On Start Switch for testing procedures See page 11 Page 6 10171 121597 TROUBLESHOOTING cont Problem Grinder will not start cont Grinder will not shut off Grinder starts but will not dis pense Incorrect amount of coffee Incorrect coffee grind dispensed Probable Cause 4 Timer Relay 6 Motor Off On Start switch 2 Timer 3 Relay Hopper Bottom of hopper oe Shear plate Timer adjustment Burr adjustment Page 7 Remedy Refer to Service Timer for testing procedures See page 13 Refer to Service Relay for testing procedures See page 12 Refer to Service Motor for testing procedures See page 9 A Place the switch in the OFF left position B Refer to Service Off On Start Switch for testing procedures See page 11 Refer to Service Timer for testing procedures See page 13 Refer to Service Relay for testing procedures See page 12 Begin each grind cycle by visually inspecting the hopper for an ample supply of whole bean coffee Foreign materials must not block the opening at the bottom of the hopper Refer to Service Motor for replace ment procedures See page 9 Refer to the Adjustments section See page 4 Refer to the Adjustments section See page 4 10171 121597 SERVICE This section provides procedures for testing an
5. Replacement MOTOR 1 Remove all wires from the Off On Start switch motor and motor mounting plate 2 Theentire wiring harness must be fed into the bottom Page 9 11 12 13 of the grinder housing through the hole in the motor mounting plate Remove both 6 32 screws beneath the upper front inspection panel Remove the six 10 32 hex head screws on top of the motor mounting plate Slowly slide the assembly out the rear of the grinder housing The mounting plate will have to be raised to gain clearance for the motor hardware and wiring harness bushing Remove the four 5 16 18 bolts and nuts to separate the motor from the mounting plate Mount the new motor and tighten the four bolts and nuts They should be tightened approximately one full turn past snug Slide the motor mounting plate into the rear of the grinder housing Feed the wiring harness into the top of the housing through the hole in the motor plate Reinstall the six 10 32 hex head screws through the motor plate and the two 6 32 screws through the housing Reattach the green wire to the 10 32 stud on the motor mounting plate Refer to the Off On Start switch section when recon necting the switch wires Refer to the illustration below when reconnecting the motor wires WHI BLU to Snubber WHI BLU to Relay WHI BLK to Cordset 120V models RED BLK to Cordset 230V models WHI BLK to Snubber GRN to Chasis Gro
6. check the grinder wiring har ness 4 Remove the white orange and white yellow wires from terminals amp TL5 5 Check for continuity across the white orange and white yellow wires when the Off On Start switch is placed in the START right position continuity is present as described reconnect the white orange wire to terminal TL3 and the white yellow wire to terminal TL5 and proceed to step 6 continuity is not present as described refer to the Wiring Diagram and check the grinder wiring harness Page 13 6 Check the voltage across terminals TL1 and TL4 with a voltmeter when the Off On Start switch is placed in the START right position and released Connect grinder to the power supply The indication must be a 120 volts ac for two wire 120 volt mod els b 240 volts ac for two wire 240 volt models 7 Disconnect the grinder from the power supply If voltage is present as described the timer is Operating properly Refer to the Adjustments section to vary the amount dispensed If voltage is not present as described replace the timer Removal and Replacement 1 Remove all wires from the timer terminals 2 Remove the four 6 32 screws and nuts holding the circuit board to the timer bracket 3 Remove the two 6 32 screws and nuts holding the dial plate to the timer bracket 4 Installthe new dial plate and circuit board to the timer bracket 5 Refer to the illustr
7. 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 to repair the defective components provided that
8. ation below when reconnecting the wires 6 Refer to the Adjustments section to vary the amount dispensed WHI RED to Relay WHI RED to Off On Start Switch WHI to Cordset 120 v RED BLK to Cordset 240 v WHI ORA to Off On Start Switch WHI GRN to Relay Coil WHI YEL to Off On Start Switch Single set timer shown Multi set timer Urn Carafe connections are the same P1313 10171 121597 WIRING DIAGRAM SCHEMATIC WIRING DIAGRAM G9 WHI RED W H 0 OPTIONAL KEY SW 120VOLTSAC 2 WIRE Ban 5 e SINGLE PHASE 60 HZ SCHEMATIC WIRING DIAGRAM G9 URN CARAFE WHI RED WHI RED 120VOLTS AC 2 WIRE KE CARAFE SINGLE PHASE MULTI SET sw 60 7 OPTIONAL Page 14 10171 041597 SCHEMATIC WIRING DIAGRAM G9A HD GREEN WHI RED 200 VOLTS AC 2 WIRE SINGLE PHASE 50 HZ SCHEMATIC WIRING DIAGRAM G9A HD POWER INDICATOR LIGHT WHI RED 200 VOLTS AC 2 WIRE SINGLE PHASE 50 HZ Page 15 WIRING DIAGRAM SCHEMATIC WIRING DIAGRAM G9 GREEN 1 WHI RED 120 VOLTS AC 2 WIRE De eeeeeeeeeeeeeeee SINGLE PHASE OPTIONAL BREWER OPTIONAL INTERFACE CONNECTOR MULTI SET SW SCHEMATIC WIRING DIAGRAM G9 GREEN 1 WHI RED 120 VOLTS AC OPTIONAL BREWER 2 WIRE INTERFACE CONNECTOR 16
9. d replacing various major components used in this grinder 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 grinder should be disconnected from the power supply when servicing except when electrical tests are required and the test procedure specifically states to plug in the grinder Component Access WARNING Disconnect the grinder from the power supply before the removal of any panel or the replace ment of any component All components are accessible by the removal of the upper and lower front inspection panels top lid rear panel and hopper The upper front inspection panel is attached with two 6 32 screws The lower front inspection panel is attached with two 6 32 screws Page 8 The top lid is attached with four 6 32 screws These screws need only to be loosened for lid removal The hopper extension assembly is attached with six 8 32 Screws Contents Motor 9 Off On Start Switch 11 Urn Caraffe Switch 11 Relay 12
10. ent of the burrs should be followed by an adjustment of the timer Burr Adjustment 1 Unplug the grinder and empty all beans from the hopper 2 Plug in the grinder momentarily place the Off On Start switch in the START right position and run a few grind cycles until all of the cof fee in the grind chamber is used up Remove the upper front inspection panel 4 Loosen the burr adjustment screw from its locked position 5 loosen the adjustment locking nut around the screw approximate ly one turn 6 Place the Off On Start switch in the START right position and slowly turn the adjusting screw in a clockwise direction until a metallic whine is heard due to the rubbing of the grinding burrs It may be necessary to start more than one grind cycle to obtain this sound 581 4 10171 041597 ADJUSTMENTS cont Burr Adjustment cont 7 Make a mark with a pen on the decal to note the position of the arrow on the grind adjustment screw 8 The following settings approximately correspond to the CBC recognized grinds All are referenced from the arrow position noted in step 7 FINE GRIND Rotate the adjusting screw 7 hash marks in a counterclockwise direction DRIP GRIND Rotate the adjusting screw 8 hash marks in a counterclockwise direction REGULAR COARSE GRIND Rotate the adjusting screw 12 hash marks in a counterclockwise direction 9 Hold the adjusting screw in its set posi
11. er than 10 feet if 18 gage 3 conductor wire 37881 0000 FAILURE TO COMPLY RISKS EQUIPMENT DAMAGE FIRE OR SHOCK HAZARD A CAUTION READ THE ENTIRE OPERATING MANUAL INCLUDING THE LIMIT OF WARRANTY AND DUCT PERSONAL INJURY LIABILITY BEFORE BUYING OR USING THIS PRODUC HAZARD 20545 00000 01 04 1990 Bunn O Matic Corporation KEEP FINGERS AND 20545 0000 FOREIGN OBJECTS OUT OF HOPPER OR CHUTE OPENING 05876 0000 ELECTRICAL REQUIREMENTS This grinder has an attached cordset and requires 2 wire grounded service rated 120 volts ac 15 amp single phase 60 Hz or 2 wire grounded service rated 220 240 volts ac 4 7 amp single phase 50 Hz INITIAL SET UP 1 Open the top lid Clear all foreign objects and shipping materials from the hopper compartment and the entrance to the grind chamber 2 Fill hopper compartment with whole bean coffee Capacity 9 pounds The grinder is now ready for use OPERATING CONTROLS Off On Start Switch OFF left position Placing the switch in this position stops the operation of the grinder ON center resting position The switch will return to this position after a grind cycle has begun and will remain in this position after grinding has ceased START right momentary position Placing the switch in this position initiates a timed grind cycle Batch Selector Switch Optional URN Switching to this position allows the correct amount of beans to be d
12. erminals or the application of external voltages may result in board failure e 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 e Make certain that all electrical connections are tight and isolated WARNING e Exercise extreme caution when servicing electrical equipment Turn power OFF when servicing except when electrical tests are specified Follow recommended service procedures e Replace all protective shields or safety notices Problem Probable Cause Remedy Grinder will not start 1 Motor overload protector Remove the cover plate located on the right side of the housing Press the red Reset button Listen carefully for a click This resets the motor protection circuit and indicates that an overload may have been encountered by the motor An overload can occur when something other than coffee is inserted into the hopper for grinding Refer to Service Motor for disassembly procedures See page 9 2 No power or incorrect voltage Check the voltage at the power cord with a voltmeter Voltage must be A 120 volts across the black and white wires for 120 volt models B 240 volts across the black and red black wires for 240 volt models 3 Off On Start switch A Momentarily place the switch in the START right
13. esent for the approximate setting on the timer 6 Disconnect the grinder from the power supply continuity is present as described reconnect the white red and white blue wires the relay is operating properly continuity is not present as described replace the relay Removal and Replacement Remove all wires from the relay terminals 2 Remove the 6 32 screw fastening the relay to the timer bracket 3 Mount the new relay to the timer bracket and tighten the screw 4 Refer to the illustration below when reconnect ing the wires WHI BLU to Motor L1 WHI GRN to Timer L4 WHI RED to Timer TL1 10171 121597 SERVICE cont Timer Single set timer shown Multi set timer Urn Carafe similar Location The timer is located on the timer bracket in the grinder base The bracket can be removed by loosen ing the two 8 32 screws beneath the timer dial s Test Procedure 1 Disconnect the grinder from the power supply 2 Check the voltage across terminals TL1 8 TL2 with a voltmeter when the Off On Start switch is placed in the START right position and released Connect grinder to the power supply The indication must be a 120 volts ac for two wire 120 volt mod els b 240 volts ac for two wire 240 volt models 3 Disconnect the grinder from the power supply If voltage is present as described proceed to step 4 If voltage is not present as described refer to the Wiring Diagram and
14. h captive in the hood 4 Refer to the illustration below when reconnecting the wires WHI YEL to Timer TL5 WHI ORA to Timer TL3 BLK to Cordset WHI RED to Timer TL1 P606 Urn Carafe Switch The Urn Carafe switch is located to the left side on the front of the housing above the upper inspection panel Test Procedure 1 Disconnect the grinder from the power supply 2 Remove the tan yellow and green wires from the Switch 3 Place the switch in the CARAFE position check for continuity across the pink and the tan wire terminals also across the orange and the yellow wire terminals lf continuity is present as described in both checks proceed to step 4 continuity is not present as described in one or both of the checks replace the switch 4 Place the switch in the URN position check for continuity across the orange and green wire ter minals continuity is present as described the switch is Operating properly 10171 041597 SERVICE cont continuity is not present as described replace the switch Removal and Replacement 1 Remove all the wires from the switch termi nals 2 Compress the clips inside the housing and gently push the switch through the opening 3 Pushthe new switch into the opening and spead the clips to hold the switch in the housing 4 Refer to the illu
15. ispensed when grinding a large batch CARAFE Switching to this position allows the correct amount of beans to be dispensed when grinding small batch Page 3 10171 042707 CLEANING The use of a damp cloth rinsed in any mild non abrasive liquid detergent is recommended for cleaning all surfaces on Bunn O Matic equipment Care should be taken not to scratch the windows with any abrasive mate rial Regular cleaning will keep your grinder looking new for years COFFEE GRINDING STEP 1 STEP 2 STEP 3 STEP 4 STEPS 5 amp 6 Visually inspect the hopper for an ample supply of whole bean coffee Place a paper filter into the brew funnel The filter must not be folded over or tilted to one side Insert the funnel into the funnel rails and push until it stops Momentarily place the switch in the START right position The grinding action will stop automatically after the preset amount of ground coffee is dispensed into the funnel Remove the funnel from the grinder and level the bed of grounds by gently shaking 6 The loaded funnel is now ready for use in any commercial drip coffee brewer according to the manufacturer s instructions ADJUSTMENTS The grind can be set from very fine to very coarse The amount may be adjusted for use in most commercial coffee brewers The following procedures should be used to make adjustments A change in the burr adjustment will also change the amount dispensed Any adjustm
16. le bean coffee and grind it to a preset grind and amount into an awaiting funnel and filter from most commercial drip coffee brewers The equipment is only for indoor use on a sturdy counter or shelf Adequate space must be available above the grinder to raise the lid when adding beans Use only with whole bean coffee The grind is preset at the factory to drip specifications as set forth by the United States Department of Commerce and adopted by the Coffee Brewing Center of the Pan American Coffee Bureau Adjustments may be made to alter both the amount and grind from the factory setting BUNN O MATIG COMMERCIAL PRODUCT WARRANTY Bunn O Matic Corp BUNN warrants equipment manufactured by it as follows 1 All equipment other than as specified below 2 years parts and 1 year labor 2 Electronic circuit and or control boards parts and labor for 3 years 3 Compressors on refrigeration equipment 5 years parts and 1 year labor 4 Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis parts and labor for 3 years or 30 000 pounds of coffee whichever comes first These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the applicable warranty period This warranty does not apply to any equipment component or part that
17. stration below when reconnecting the wires TAN 5 GF YEL PNK ORA Oj P1318 Relay Single set timer shown Multi set timer Urn Carafe similar Location The relay is located on the timer bracket in the grinder base The bracket can be removed by loosen ing the two 8 32 screws beneath the timer dial Test Procedure 1 Disconnect the grinder from the power supply 2 Check the voltage across the white red and white green wires of the relay coil with a voltmeter Page 12 when the Off On Start switch is placed in the START right position and released Connect grinder to the power supply The indication must be a 120 volts ac for two wire 120 volt models 240 volts ac for two wire 240 volt models for the approximate setting on the timer 3 Disconnect the grinder from the power supply If voltage is present as described reconnect the white red and white green wires to the relay coil and proceed to step 4 If voltage is not present as described refer to the Wiring Diagrams and check the grinder wiring harness 4 Remove the white red and white blue wires from the relay contacts 5 Check for continuity across the relay contacts when the Off On Start switch is placed in the START right position and released Connect grinder to the power supply Continuity must be pr
18. 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 Page 2 10171 042707 USER NOTICES Carefully read and follow all notices on the grinder and in this manual They were written for your protection All notices on the grinder are to be kept in good condition Replace any unreadable or damaged labels 7 N AWARNING To the risk of electric shock do not remove or open cover No user serviceable parts inside Authorized service personnel only Disconnect power before servicing AWARNING 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 An extension cord when used must be shorter than 20 feet if 16 gage 3 conductor wire or short
19. tion with a screwdriver while tightening the lock nut to a snug posi tion by hand Slightly loosen the adjusting screw and retighten it to its prior position The lock nut should now be tight against the burr housing front cover Timer Adjustment NOTE Grinders with Multi Set option Urn Carafe must be adjusted in both settings 1 Unplug the grinder and remove the lower front inspection panel 2 Determine the grind setting The factory setting is drip to determine other settings refer to the previous section 3 Use the table below to find the approximate timer setting for the grind and amount of coffee desired 4 the timer for the desired amount of coffee to be ground 5 Verify the setting by weighing a few samples Use the table below as an APPROXIMATE guide only APPROXIMATE TIMER SETTINGS IN SECONDS WEIGHT FINE DRIP REGULAR OUNCES _ 7 8 12 4 0 7 1 6 2 0 Hash mark settings Refer to Adjustment Burr section Page 5 10171 041597 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 e Inspection testing and repair of electrical equipment should be performed only by qualified service per sonnel e All electronic components have 120 volt ac and low voltage dc potential on their terminals Shorting of t
20. und YEL to Snubber WHI BLK to Snubber YEL to Snubber WHI BLU to Snubber WHI BLK to Cordset WHI BLU to Relay GRN to Chasis Ground MARATHON MOTOR P621 10171 042707 SERVICE cont Motor cont NM Adjusting Screw Locknut Adjusting Screw Burr Housing Cap Rotor Cup Shear Plate Removal and Replacement GRIND CHAMBER 1 Refer to the illustration above and remove the two 1 4 20 hex head screws holding the burr housing cap 3 to the burr housing carefully re move the burr housing cap Inspect the adjusting screw 2 to see if the thrust plug is worn Replace if excessively worn or damaged Carefully remove rotor cup 4 shear plate 5 and burr rotor 6 from the grinder Inspect the shear plate and burr 8 for wear Replace if excessively worn or damaged Remove and inspect stationary burr 9 for wear Replace if excessively worn or damaged NOTE Burrs must be replaced as a set Page 10 oo N Rotor Spring Burr Rotating Burr Stationary Inspect the grind chamber and remove any for eign materials The burrs will not properly seat in the chamber if any material or coffee particles remain Reinstall the stationary burr spring burr rotor shear plate rotor cup and burr housing cap to the burr housing Refer to the Adjustments section to vary the grind dispensed 10171 041597 SERVICE cont Off On Start Switch Location
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