Bunn G9WD-RH Series User manual

BUNN®TECHNICAL TRAINING
G9WD-RH

Index
Unit 1: Installation
Site Requirements .............................................................................................................. 4
Location of the Serial Number .......................................................................................... 4
Electrical Install ..................................................................................................................4
Burr Adjustments ............................................................................................................... 4
Hopper Install and Coffee Grinding .................................................................................. 5
Unit 2: Setup
Setup and Programming.................................................................................................... 7
User Interface ...............................................................................................................7
Programming Lockout................................................................................................. 8
Level 1 Programming ......................................................................................................... 8
Level 2 Programming ......................................................................................................... 9
Calibrating the Selected Coffee ........................................................................................ 10
Calibrating Grinder Scale .................................................................................................. 11
Unit 3: Machine Composition
Exterior Overview ............................................................................................................... 14
Product Outlets and Removable Parts ......................................................................14
Accessing the Inside of the Grinder and Internal Assemblies....................................... 14
Control Panel................................................................................................................ 14
Component Bracket Assembly ................................................................................... 15
Load Cell or Weigh Scale Assembly .......................................................................... 15
Motor Mounting Plate Assembly ................................................................................15
Motor/Burr Assembly................................................................................................... 15
Machine Function and Operations.................................................................................... 16
Hopper Assembly......................................................................................................... 16
Grind System................................................................................................................ 17
Load Cell or Weigh Scale ............................................................................................ 17
Display/Control Panel .................................................................................................. 17
Unit 4: Preventive Maintenance
Preventive Maintenance..................................................................................................... 20
Prior to Servicing the Grinder ........................................................................................... 20
PM Steps .............................................................................................................................20
Unit 5: Troubleshooting
Service Tools ...................................................................................................................... 23
Test Outputs ................................................................................................................. 24
Test Switches ............................................................................................................... 24
Test Frequency............................................................................................................. 24
Error Messages................................................................................................................... 24
Transducer Replacement Special Instructions................................................................ 25
© 2010 Bunn-O-Matic Corporation. All Rights Reserved
Rev. A

Unit Objectives
Unit 1 installation
Given a realistic scenario depicting a new site install, the learner will be able to install and setup the Weight
Driven Grinder for customer turnover without error.
Given a new machine, all the necessary tools and safety equipment, the learner will be able to install
the Weight Driven Grinder without error.
The learner will be able to verify that the site requirements have been met.
The learner will be able to locate and document the serial number.
The learner will be able to install, power up, and perform the burr adjustment procedure.
The learner will be able to install the hopper, coffee beans and start a coffee grind cycle.

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Installation
Site Requirements
Space
• G9WD-RH is only for indoor use on a sturdy counter or shelf
• Adequate space must be available above the grinder to raise the lids when adding beans
• G9WD-RH dimensions is 29.1”H x 9.0” W x 16.0” D (73.9cm H x 22.8cm W x 40.6cm D)
• Weight 67 lbs
Electrical
• 120vac, 2 wire plus ground
• 15Amp circuit breaker, single phase, 60 Hz
• ¾ H.P. Motor
Location of the Serial Number
The machine’s serial number is located on the data plate which is located on the lower rear housing.
Electrical Install
Step 1: Plug-in the attached cordset from the grinder into a conventional 120 volt outlet.
Step 2: The grinder LCD (Liquid Crystal Display) will light up and the grinder is ready for the Burr Adjustment.
Burr Adjustment
ThegrinderisFactorySetat“Drip”grindbutcanbesetfromnetoverycoarsegrind.Thefollowingprocedures
should be used to make adjustments before initial set-up of the hopper and coffee beans.
Step 1: Remove two black screws from the lower control panel bezel.
Step 2: Remove the control panel and hang the control panel on front of grinder by inserting metal tabs on the back
of control panel into slots on the front of grinder.
Step 3:Makesurefunnelwithlterisplacedinthefunnelrails.Gotothe“GRINDMOTOR”menuunderthelevel
1“SERVICETOOL?”menu,andpressthebuttonunder“ON”tostartthemotor.Slowlyturntheadjust¬ingscrewin
a clockwise direction until a metallic whine is heard due to the rubbing of the grinding burrs. Reverse the adjusting
screw just until the whining stops. Turn off the motor and exit to home screen.
Step 4: Rotate the white plastic cap on the end of the grinder with the “0” aligned with the adjusting screw slot.
Step 5:ThefollowingsettingsapproximatelycorrespondtotheCBCrecognizedgrinds.FINEGRIND:Rotatethe
adjustingscrewtothe“7”inacounterclockwisedirection.DRIPGRIND:Rotatetheadjustingscrewtothe“8”ina
counterclockwisedirection.Regular(Coarse)Grind:Rotatetheadjustingscrewtothe“12”counterclockwise
direction.
Step 6: Reinstall front control panel.

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Note: The grind may need further adjustment after the initial setup of the hopper and coffee bean grind test. You will
need to remove the hopper and run grind cycles until all of the coffee in the grind chamber is dispensed. Repeat the
burr adjustment procedure until the desired grind is accomplished.
Hopper Install and Coffee Grinding
Step 1: Install hopper onto base.
Step 2: Fill hopper with whole beans. Hopper capacity is 6lbs.
Step 3:Placeapaperlterintothebrewfunnel.Theltermustnotbefolded-overortiltedtooneside.
Step 4: Insert the funnel into the funnel rails until it stops.
Step 5: Select batch size.
Step 6: Momentarily press the “START” switch. The grinding will begin after a moment. The recipe and actual weight
ofthecoffeebeinggroundintothefunnelwillbeshownonthedisplayduringgrinding.Thegrinderwillautomati¬cally
stopwhenthecorrectweightisreached.DONOTTOUCHTHEFUNNELORFUNNELHANDLEDURINGGRIND-
ING.THISWILLCAUSETHEINCORRECTWEIGHTOFCOFFEETOBEGROUND.
Step 7: Remove the funnel from the grinder and level the bed of grounds by gently shaking.
Step 8: The loaded funnel is now ready for use in any commercial drip coffee brewer according to the
manufac¬turer’sinstructions.

Unit Objectives
Unit 2 setup
Given a realistic scenario depicting a new site install, the learner will be able to install and setup the Weight
Driven Grinder for customer turnover without error.
Given an installed machine, all the necessary tools and safety equipment, the learner will be able to
set the machine up for initial operation.
The learner will be able to operate the interface touchpad panel.
The learner will be able to enter level 1 and 2 programming and be knowledgeable of the main
menu and sub screens.
The learner will be able to perform the calibrations.

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Setup and Programming
Accessing and using the brewer’s programming features is done from the front panel and requires no special tools.
The user interface allows the user to program the grinder for product recipes and begin the grind process with the
selection of a batch size.
A. Hidden buttons used to navigate setup and programming menus.
B. Hidden button used to access the programming menus.
C. Hidden button used to navigate the programming menus.
Operating Controls
D. Used to select between small, medium and large batch size.
E. Used to initiate or start a grind cycle.
F. Used to stop the operation of the grinder.
C
D
EF

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Programming Lockout
Disconnect grinder from power source before removing any
panel.
The program lockout switch is located on the main control
board. Accessing the lockout switch, you will need to remove
the switch panel by removing two standard screws. The lock-
out switch is located on the rear lower corner of the CBA.
This switch can be set to prevent change to the program-
ming settings of the brewer. Once all the correct settings are
programmed, the operator can set the switch to the “Lock”
position to prohibit anyone from changing the settings. With
the switch in the “Lock” position, the programming menus can
still be accessed to view the current settings. However, no
changes will be saved. The menu will display a message “Memory is locked, constant change is not possible” when
you enter the programming menus.
Level 1 Programming
Press and hold the switch labeled “B” in the diagram for 1 second to enter Level 1.
The menu is used to select the coffee name from the recipe list and will keep
     recordofthetotalpoundsusedfortheselectedcoffeeavororcoffeename.
This function screen prompts the user to enter in a password to advance
farther into programming. If a password has not been set then access is
allowed by advancing through the programming screens.
This function allows the operator to set a password to be entered at the “Enter
Password” screen. The password is set to prevent access to certain levels of
programming so that setup functions can not be altered.
This function has two parts. It allows the operator to view the recipe parameters
settings and allows the operator to modify any of the recipe settings for a particu-
lar coffee name.
This function allows the operator to enter in an optional asset number. This can
be useful for tracking the usage or service of an individual machine within a
group.
This function enables the operator to enter in to the diagnostic section of
programming. The items that can be checked vary from machine to machine.
This is a feature that aides in troubleshooting and test individual input and out-
puts.
Selecting “Yes” will reset all of the previously entered settings and
calibrations. Factory preset default values will replace all previous settings.
ENTER ASSET #
AN000000

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New Level 1 Sub-Menus
Below are new sub-menus associated with the G9WD.
This menu sets the “offset” weight for the coffee name selected so accurate
weight grinding will be achieved.
This menu allows selection of scale test and will prompt you to tare the funnel
and add a calibrated weight to check the scale.
This menu is prompted in the “Test Scale” menu which allows the present
weight/funnel to be tarred.
This menu is prompted in the “Test Scale” menu to show the measurement of
weight in ounces. The weight being applied to the load cell has a direct relation
to the electrical signal which is converted into a readable format called “Sensor
Bits”.
This menu allows the switches on the control panel to be disabled for servicing
of the grinder
This menu shows the total amount of the coffee which has been ground through
the grinder. The running total can be used to determine when the grinding burrs
need cleaning or replacement.
Level 2 Programming
Enter Level 1 program. “Select Coffee” menu will appear. Depress the “B” (right hidden) switch one more time to
scroll to “Enter Password” screen. Press and hold the “B” (right hidden) switch for 3 seconds in “Enter Password”
menu to enter Level 2 programming. Level 2 programming will begin with “Machine Type” menu.
The menu is used to select between option of using the grinder as a weight
based or time based grinder.
The menu allows calibration of the scale. It is recommended to use a precision
weight to accurately calibrate the scale to the main control board during a PM or
service part replacement of the weigh scale (transducer) or CBA.
The menu allows adjustment of the “Max Bit Spread”. The Max Bit Spread is the
maximum deviation permitted in the array to accept the tare of the funnel.
The menu is used to select between the options of which style grinder is being
used, grinders with or without the read/write coils. Smart funnels are used to
transfer information between grinder and brewer. Two pieces of information
writes to the transponder and is read from the brewer which is batch size and
coffee name.

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New Level 2 Sub-Menus
Below are new Level 2 sub-menus associated with the Calibrate Scale
The menu allows you to adjust for the known precision weight which will be
added for calibration of the weigh scale.
The menu allows scale to be tarred for calibration.
This screen is displayed while scale is being tarred.
An instructional screen directing the user to place precision weight inside funnel
to continue the calibration procedure.
The last menu screen shown when completing the scale calibration.
Calibrating Selected Coffee
Afterinitialsetup,coffeenamemustbeselectedfromthecoffeeprolelist.
The machine will keep track of selected coffee weight in total pounds and ounces used. The “Calibrated Coffee”
menu located in the “Review Recipe” menu will follow after the “3 Batches Done” menu. The purpose of the “Cali-
brate Coffee” menu sets the “offset” weight for the coffee name selected, so that accurate weight grinding will be
achieved.
Step 1: Enter level 1 program and stop at “Select Coffee” menu and select yes.