BUNN ® N IO UT RY CA L INJU . ONA RD D RS ZA AN PE HA ERS CTS NG JE FI OB ER EP N PP G. KE REIG HO ENIN FO T OFE OP OU UT CH OR OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION OF CANADA LTD. 280 INDUSTRIAL PARKWAY SOUTH AURORA, ONTARIO. L4G 3T9 PHONE: (905) 841-2866 FAX: (905) 841-2775 10218.
CONTENTS Introduction .............................................................................. 2 Warranty ................................................................................... 2 User Notices .............................................................................. 3 Electrical Requirements ............................................................ 4 Operating Controls .................................................................... 4 Initial Set-Up ............................
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. WARNING 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.
ELECTRICAL REQUIREMENTS This grinder has an attached cordset and requires 2-wire, grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz. OPERATING CONTROLS Off/On/Start Switch OFF - (upper position) Switching to this position stops all operation of the grinder. ON - (middle position) The switch will return to this position after a grind cycle has begun and will remain in this position after grinding has ceased.
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 hopper or windows with any abrasive material. Regular cleaning will keep your grinder looking new for years. COFFEE GRINDING P597 STEP 1 1. 2. 3. 4. 5. 6. P598 STEP 2 P599 STEP 3 P600 STEP 4 P601 STEPS 5 & 6 Visually inspect the desired hopper for an ample supply of whole bean coffee.
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 adjustment of the burrs should be followed by an adjustment of the timer. C Burr Adjustment 1. Unplug the grinder and empty all beans from the hoppers. 2.
ADJUSTMENTS (cont.) 4. 5. 6. 7. 8. Plug-in the grinder. Select either the right or left hopper with the selector switch. Do not press the start switch. If grinder has an analog timer, proceed to step 6. If grinder has a digital timer, momentarily press the center (DISPLAY) button on the dispense timer panel. The readout will indicate the present timer setting in seconds and will remain displayed for five minutes. Adjust the timer setting to obtain the desired amount of coffee for the selected hopper.
TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Grinder will not start. 1. No power or incorrect voltage (A) Plug-in the grinder. 2. Off/On/Start switch (B) Check the voltage at the wall outlet with a voltmeter. It must be 120 volts ac. (A) Momentarily press the Off/On/ Start switch to the “START” (lower) position. (B) Refer to Service - Off/On/Start switch for testing procedures. See page 11. Grinder will not shut off. 3. Timer Refer to Service - Timer for testing procedures. See page 17.
Probable Cause Remedy 3. Relay Refer to Service - Relay for testing procedures. See page 14. 1. Hoppers Begin each grind cycle by visually inspecting the hoppers for ample supplies of whole bean coffee. 2. Bottoms of hoppers Foreign materials must not block the openings at the bottom of the hoppers. Refer to Service - Off/On/Start switch for testing procedures. See page 11j0 -1.
SERVICE This section provides procedures for testing and 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 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.
If continuity is present as described, proceed SERVICE (cont.) to #6. If continuity is not present as described, re place the switch. Off/On/Start Switch 6. Check for continuity across the right terminals when the switch is placed in the “START” (lower) position only. If continuity is present as described, the Off/On/Start switch is operating properly. If continuity is not present as described, replace the switch. Removal and Replacement: 1. Remove all wires from the switch terminals. 2.
If voltage is not present as described, refer to the Wiring Diagrams, and check the grinder wiring harness. SERVICE (cont.) Motor Removal and Replacement - MOTOR 1. Remove all wires from the solenoids and lift the hopper assy out of the grinder housing. 2. Remove all wires from the Off/On/Start switch, motor, and motor mounting plate. 3. The entire wiring harness must be fed into the bottom of the grinder housing through the hole in the motor mounting plate. 4.
SERVICE (cont.) Motor (cont.) WHI/ BLU to Snubber WHI/BLU to Relay WHI/BLK to Cordset WHI/BLK to Snubber GRN to Chasis Ground YEL to Snubber P621 Removal and Replacement - GRIND CHAMBER 1. Remove the two 1/4"-20 screws holding the front cover to the burr housing. Carefully remove the burr housing front cover. Inspect the adjusting screw to see if the thrust plug is worn. Replace if excessively worn or damaged. 2. Carefully remove the rotor cup, shear plate, and burr rotor from the grinder.
the Wiring Diagrams and check the grinder wiring harness. SERVICE (cont.) Relay 4. 5. ) ds on ec (S ME E TI NS PE e DIS reas Y Dec LA P DIS utes se ea min r5 Incr d fo sted laye adjuyed. disp be la be only disp will can t is ut ou E do mer ad AG Rea Ti le re LT whi + N IN A R VO 6. . Remove the white/red and white/blue wires from the relay contacts. Check for continuity across the relay contacts when the Off/On/Start switch is pressed to the “START” (lower) position and released.
SERVICE (cont.) Slide Plate(s) Location: The slide plates are located on the solenoid mounting plate immediately beneath the hopper openings. The slide plates must always remain flat for proper operation. Removal and Replacement: 1. Remove the hopper from the grinder. 2. Remove six slotted head screws holding the solenoid mounting panel to the hopper. 3. The slide plate with attached linkage can be lifted off the pivot pin and removed with the solenoid plunger. 4.
Solenoid(s) SERVICE (cont.) Snubber Location: The snubber is located at the back of the motor attached to the right side of the wiring harness. Location: The solenoids are located on the mounting plate immediately beneath the hoppers. Removal and Replacement: 1. Remove the snubber wires from the motor terminals. 2. Cut the ties holding the snubber to the wiring harness. 3. Refer to the following illustration when reconnecting the wires. 4. Fasten the snubber to the wiring harness using new ties.
SERVICE (cont.) If continuity is present as described, reconnect the white/brown wires to the grinder wiring harness, and proceed to #6. If continuity is not present as described, replace the solenoid. 6. 7. WHI/YEL to Timer P4-5 RED/BLK to Right Solenoid RED/BLK to Timer P4-7 Solenoid(s) (cont.) RED/BLK to Left Solenoid Right WHI/ORN to Timer P4-4 Check the solenoid for coil action when the control switch is momentarily pressed to the “START” (lower) position and released. Plug-in the grinder.
has been momentarily pressed to the right “START” (lower) position and released. Plug-in the grinder. The indication must be 120 volts ac and should remain for the approximate timer setting. 11. Unplug the grinder. SERVICE (cont.) Timer (cont.) 4. 5. Check the voltage across contacts 2 & 6 of the larger connector on the timer board with a voltmeter when the control switch is in any position except “OFF” (center). Plug-in the grinder. The indication must be 120 volts ac. Unplug the grinder.
SERVICE (cont.) Timer (cont.
L1 N YEL VIO BLK WHI/BLK WHI/GRN WHI/ORA WHI/YEL GRY TAN ORA RT LT SOL 2 SOL 1 BLU K1 RED/BLK WHI/RED WHI/BLU YEL SNUBBER WHI/BLK WHI/RED WHI/BLU K1 N.O. 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ WHI/BLK M L1 L2 10756.