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Bunn G1 manual

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Table of contents for the manual

  • Page 1

    C L E A N I N G L E V E R G R O UN D C O FF EE 1 . S e l e c t t h e de s i r e d g r in d . 2 . L i f t t h e l i d a n d p o u r c o f f e e b e a n s in t o t h e h op p e r . 3 . S l i p b a g u n d e r t h e c h u t e . R e s t t he b a g o n t h e t r a y . 4 . P r e s s t h e s ta r t s w i t c h . 5 . F l i p t h e c l e a n in g le v e r a[...]

  • Page 2

    2 10191 070306 BUNN-O-MA TIC COMMERCIAL PRODUCT W ARRANTY 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 par[...]

  • Page 3

    3 SPECIAL R E G U L A R E L E C P E R C A U T O M A T I C D R I P[...]

  • Page 4

    4 ELECTRICAL REQUIREMENTS The 120 volt and 240 volt grinders have an attached cordset and requires 2-wire, grounded service rated 120 volts ac and 240 volts ac, 15 amp, single phase, 60 Hz. The 230 volt grinders have a power connector and requires 2-wire, grounded service rated 230 volts ac, 15 amp, single phase, 50 Hz. INITIAL SET -UP CAUTION - Un[...]

  • Page 5

    5 COFFEE GRINDING 1. T urn the selector knob to align the red arrow with the desired grind. 2. Raise the top lid and add the whole bean coffee. Close the top lid. 3. Locate the back of a bag behind the dispense chute. (The grinder will not operate unless the bag is behind the chute.) 4. Allow the bag to rest on the screen beneath the chute. 5. Pres[...]

  • Page 6

    6 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 T echnical Ser vice Department. • Inspection, testing, and repair of electrical equipment should be performed only by qualified service[...]

  • Page 7

    7 PROBABLE CAUSE 3. Bag Sensor . (cont.) 4. Motor overload protector . 1. Off/On/Start Switch 2. Bag Sensor 3. Relay TROUBLESHOOTING (cont.) PROBLEM Grinder will not start. (cont.) Grinder will not shut off. REMEDY (B) Refer to Ser vice - Bag Sensor Switch for testing and adjustment procedures. See page 9. Remove the plug located on the right side [...]

  • Page 8

    8 TROUBLESHOOTING (cont.) PROBABLE CAUSE 1. Hopper 2. Entrance to grind chamber 3.Shear Plate PROBLEM Grinder starts, but will not dis- pense. REMEDY Coffee must be poured into hopper before grinding. Foreign materials must not block the opening at the bottom of the hopper . Remove both black fillister head screws holding the grinder selector dial [...]

  • Page 9

    9 CONTENTS Bag Sensor Switch ..............................................9 Motor and Grind Chamber (AC) ........................10 Motor and Grind Chamber (DC) ........................13 Off/On/Start Switch ...........................................16 Rectifier ............................................................17 Relay ...............[...]

  • Page 10

    10 4. Disconnect the grinder from the power source. If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the Wiring Diagrams and check the grinder wiring harness. 5. Check for continuity across the terminals on the bag sensor switch. If continuity is present as described, reconnect the wires, the switc[...]

  • Page 11

    11 SERVICE (cont,) AC MOTOR AND GRIND CHAMBER (cont.) WHI/BLU to Relay N.O.(K4) WHI to Cordset (120V) RED/BLK to Cordset (230V) GRN to Ground (120V) GRN/YEL to Ground (230V) P1310 Removal and Replacement - Grind Chamber - Refer to Fig. 6: 1. Lo osen the tw o set scre ws (1 6) sec uri ng the gri nd selector knob to the grind selector dial plate (18)[...]

  • Page 12

    12 SERVICE (cont.)[...]

  • Page 13

    13 17. Ins tal l grind selec tor dial plat e (18) with adju sting scr ew w/be aring (19) onto the gr ind cham ber and secure with two .250”-20 screws (1). 18. Install grind selector knob (17) onto the grind selector dial plate (18). NOTE: Refer to ADJUSTMENTS and reset the burrs. SERVICE (cont.) DC MOTOR AND GRIND CHAMBER - G1MD ONL Y[...]

  • Page 14

    14 SERVICE (cont,) DC MOTOR AND GRIND CHAMBER - G1MD ONL Y (cont.)[...]

  • Page 15

    15 SERVICE (cont,) DC MOTOR AND GRIND CHAMBER - G1MD ONL Y (cont.)[...]

  • Page 16

    16 Location: The Off/On/Start switch is located in the up- per front wrapper above and to the right of the grind selector knob (left side when viewed from rear). T est Procedure: 1. Disconnect the grinder from the power source. 2. Check the voltage across the black wire on the Off/On/Star t switch and the white wire or the red/ black on the relay c[...]

  • Page 17

    17 + A C A C SERVICE (cont.) Removal and Replacement: 1. Disconnect the wires from the rectifier . 2. Remove the #10-32 screw securing the rectifier to the motor mounting bracket. 3. Remove the rectifier and discard. 4. Install new rectifier on the rear of the motor mounting bracket and secure with a #10-32 screw . 5. Refer to Fig. 13 and recon[...]

  • Page 18

    18 Location: The relay is located on the grinder base inside the lower housing. T est Procedure: 1. Disconnect the grinder from the power sour ce and place a coffee bag behind the dispense chute. 2. Check the voltage across the white/orange and white or red/black wires on terminals A & B of the relay with a voltmeter . Hold the Off/On/Start swi[...]

  • Page 19

    19[...]

  • Page 20

    20 WHI/VIO WHI/VIO WHI/BLU WHI/ORA 1 or A GRN L1 N SW1 BLK WHI/RED SW2 K 0 or B M L1 L2 120 VOL T AC 2 WIRE SINGLE PHASE 60 HZ WHI WHI K-2 or K-7 K-8 or K-9 K-6 K-4 SCHEMA TIC WIRING DIAGRAM G1, G2 & G3 10190.0000G 07/05 © 1985 BUNN-O-MA TIC CORPORA TION 10191 070306[...]

  • Page 21

    21 WHI/VIO WHI/VIO WHI/BLU WHI/ORA SCHEMA TIC WIRING DIAGRAM G1A, G2A & G3A GRN/YEL L1 L2 SW1 BLK WHI/RED WHI/RED SW2 N.O. N.O. M L1 L2 RED (230V) RED/BLK (240V) RED (230V) RED/BLK (240V) 10754.0000E 07/05 © 1993 BUNN-O-MA TIC CORPORA TION K-4 K-6 230 VOL TS AC 240 VOL TS AC 2 WIRE SINGLE PHASE K 1 or A 0 or B K-2 or K-7 K-8 or K-9 10191 07030[...]