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Bunn G9-2 HD-S - page 1
BU N N ® OPERA TING & SER VICE MANU AL BUNN-O-MA TIC CORPORA TION OF CANAD A L TD . 280 INDUSTRIAL P ARKW A Y SOUTH AURORA, ONT ARIO. L4G 3T9 PHONE: (905) 841-2866 F AX: (905) 841-2775 10218.7000 3/00 ©1994 Bunn-O-Matic Corporation P E R S O N A L IN J U R Y H A Z A R D . K E E P F I N G E R S A N D F O R E I G N O B J E C T S O U T O F H O P ...
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Bunn G9-2 HD-S - page 2
2 CONTENTS Introduction .............................................................................. 2 Warranty ................................................................................... 2 User Notices .............................................................................. 3 Electrical Requirements ................................ ...
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Bunn G9-2 HD-S - page 3
3 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. #05942.0000 DISPENSE TIME (Seconds) DISPLAY Increase Decrease Readout will be displayed for 5 minutes. Timer can only be ...
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Bunn G9-2 HD-S - page 4
4 ELECTRICAL REQUIREMENTS This grinder has an attached cordset and requires 2-wire, grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz. OPERA TING 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 gr ...
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Bunn G9-2 HD-S - page 5
5 CLEANING The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all sur faces 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 STEP 1 STEP 2 STEP 3 STEP 4 ST ...
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Bunn G9-2 HD-S - page 6
6 ADJUSTMENTS The grind can be set from very fine to ver y coarse. The amount may be adjusted for use in most commer - cial coffee brewers. The following procedures should be used to make adjustments. A change in the burr adjust- ment will also change the amount dispensed. Any adjustment of the burrs should be followed by an adjustment of the timer ...
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Bunn G9-2 HD-S - page 7
7 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 T ech- nical Service Department. • Inspection, testing, and repair of electrical equipment should be performed only by q ...
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Bunn G9-2 HD-S - page 8
8 TROUBLESHOOTING (cont.) Problem Grinder will not start. Remedy (A) Plug-in the grinder . (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 “ST AR T” (lower) position. (B) Refer to Service - Off/On/Start switch for testing procedures. See page 11. Refer to ...
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Bunn G9-2 HD-S - page 9
9 Probable Cause 3. Relay 1. Hoppers 2. Bottoms of hoppers Remedy Refer to Service - Relay for testing procedures. See page 14. Begin each grind cycle by visually inspecting the hoppers for ample supplies of whole bean coffee. Foreign materials must not block the openings at the bottom of the hoppers. Refer to Service - Off/On/Start switch for test ...
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Bunn G9-2 HD-S - page 10
10 The rear panel is attached with eight 8-32 slot- ted head screws. The hopper assembly is attached with four 6- 32 slotted head screws with locking nuts located on the sides of the housing near the center and rear . Removal of the hopper will also require disconnec- tion of the solenoid wires from the grinder wiring har - ness. Contents Off/On/St ...
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Bunn G9-2 HD-S - page 11
11 SERVICE (cont.) Off/On/Start Switch Location: The Off/On/Start switch is located to the left side on the front of the housing above the upper front inspection panel. T est Pr ocedure: 1. Unplug the grinder . 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 ...
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Bunn G9-2 HD-S - page 12
12 SERVICE (cont.) Motor Location: The motor is located in the upper wrapper . T est Pr ocedure: 1. Remove the cover plate located on the right side of the housing. Press the red “Reset” button vis- ible through the opening. Listen carefully for a “click”. This resets the motor protection cir cuit and may indicate that something other than ...
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Bunn G9-2 HD-S - page 13
13 SERVICE (cont.) Motor (cont.) 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 pl ...
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Bunn G9-2 HD-S - page 14
14 SERVICE (cont.) Relay 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 slotted head screws beneath the timer dial. T est Pr ocedure: 1. Unplug the grinder . 2. Check the voltage across the red/black and white/green wires of the relay coil with a volt- meter when the O ...
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Bunn G9-2 HD-S - page 15
15 SERVICE (cont.) Slide Plate(s) Location: The slide plates are located on the solenoid mounting plate immediately beneath the hopper open- ings. The slide plates must always remain flat for proper operation. T est Pr ocedure: With the solenoid mounting plate attached to the hopper , push the solenoid plunger into the coil. The slide plate must mo ...
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Bunn G9-2 HD-S - page 16
16 SERVICE (cont.) Snubber Location: The snubber is located at the back of the motor attached to the right side of the wiring harness. Removal and Replacement: 1. Remove the snubber wires from the motor ter - minals. 2. Cut the ties holding the snubber to the wiring harness. 3. Refer to the following illustration when recon- necting the wires. 4. F ...
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Bunn G9-2 HD-S - page 17
17 Timer Location: The timer is located in the grinder base. T est Pr ocedure: 1. Unplug the grinder . 2. Check the voltage across contacts 1 & 2 of the larger connector on the timer board with a volt- meter whenever the grinder is plugged-in. Plug- in the grinder . The indication must be 120 volts ac. 3. Unplug the grinder . SERVICE (cont.) So ...
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Bunn G9-2 HD-S - page 18
18 4. Check the voltage across contacts 2 & 6 of the larger connector on the timer board with a volt- meter when the control switch is in any position except “OFF” (center). Plug-in the grinder . The in- dication must be 120 volts ac. 5. Unplug the grinder . If voltage is present as described, proceed to #6. If voltage is not present as des ...
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Bunn G9-2 HD-S - page 19
19 P614 1 8 P4 P1 1 8 3 1 P2 P3 1 11 BLK to Cordset BLK to Off/On/Start Switch WHI/BLK to Cordset WHI/GRN to Relay Coil WHI/ORN to Left Solenoid WHI/YEL to Right Solenoid WHI/RED to Off/On/Start Switch WHI/RED to Relay Contact RED/BLK to Relay Coil RED/BLK to Left Solenoid (P1-8) BLU to Off/On/Start Switch, Selector Switch (P1-6) ORA to Selector Sw ...
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Bunn G9-2 HD-S - page 20
20 BLU VIO YEL GRY TAN ORA WHI/BLK RED/BLK WHI/GRN WHI/ORA WHI/YEL WHI/RED WHI/BLK BLK WHI/RED WHI/BLU M K1 SOL 1 RT SOL 2 LT SNUBBER L2 L1 WHI/BLU WHI/BLK YEL 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ 10756.0000G 3/97 © 1993 BUNN-O-MATIC CORPORATION L1 N K1 N.O. ...
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