Bunn LPG, LPG-2E User Manual

OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: (217) 529-6601 FAX: (217) 529-6644

www.bunnomatic.com

CONTENTS

User Notices .............................................................3

Electrical Requirements ............................................3

Operating Controls....................................................3

Cleaning.................................................................... 4

Coffee Grinding......................................................... 4

Initial Set-Up............................................................. 5

Adjustments .............................................................5

Troubleshooting ........................................................6

Service..................................................................... 8

Wiring Schematics..................................................18

INTRODUCTION

The LPG will store up to six pounds and the LPG-2E will store up to three pounds of whole bean coffee in each of two hoppers 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.

WARRANTY

Bunn-O-Matic Corp. (“Bunn”) warrants the equipment manufactured by it to be commercially free from defects in material and workmanship existing at the time of manufacture and appearing within one year from the date of installation. In addition:

1.) Bunn warrants electronic circuit and/or control boards to be commercially free from defects in material and

workmanship for three years from the date of installation.

2.) Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material

and workmanship for two years from the date of installation.

3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory

screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever comes first.

This warranty does not apply to any equipment, component or part that was not manufactured by Bunn or that, in Bunn’s judgement, has been affected by misuse, neglect, alteration, improper installation or operation, improper maintenance or repair, damage or casualty.

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.

The Buyer shall give 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. If requested by Bunn, the Buyer shall ship the defective equipment prepaid to an authorized Bunn service location. If Bunn determines, in its sole discretion, that the equipment does not conform to the warranty, Bunn shall repair the equipment with no charge for parts during the warranty period and no charge for labor by a Bunn Authorized Service Representative during the warranty period. If Bunn determines that repair is not feasible, Bunn shall, at its sole option, 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, AS SPECIFIED HEREIN, TO REPAIR OR, AT BUNN’S SOLE OPTION, 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.

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CLEANING

EXTERIOR SURFACES

The use of a damp cloth rinsed in any mild, nonabrasive, 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.

GRIND CHAMBER

1. WARNING - Unplug grinder before removal of any panel or grind chamber housing parts.

2. Empty all beans from both hopper(s).

3. Plug-in the grinder, place funnel with filter into funnel rails. Press the Off/On/Start switch to the “START” lower

position and release. Run a few grind cycles until all the coffee in the grind chamber is dispensed and disconnect

grinder from the power source.

4. Remove the funnel with filter and carefully tip the grinder over on it’s back.

5. Remove the two #10-32 screws securing burr housing cap assembly to the burr housing and remove burr

housing cap assembly. 6 Remove load disc and slide rotor with lower burr, spring and brass bushing off of the motor shaft.

7. Clean the grind chamber and all parts with a dry non metallic bristle brush and wipe with a dry clean cloth.

8. Reinstall brass bushing (flanged end first), spring and rotor with lower burr onto the motor shaft. Reinstall load

disc flat side toward rotor and burr housing cap assembly to the burr housing.

9. Refer to Initial Set-up/Adjustments section to vary grind or weight of dispensed coffee if necessary.

COFFEE GRINDING

1. On models LPG-2E, select (either left or right hopper) with selector switch and visually inspect the desired

hopper for an ample supply of whole bean coffee.

2. Place a paper filter into the brew funnel. The filter must not be folded-over or tilted to one side.

3. Insert the funnel into the funnel rails and push until it stops.

4. Momentarily press Off/On/Start switch to the "START" lower position and release. The grinding action will stop

automatically after the preset amount of ground coffee is dispensed into the funnel.

5. 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.

STEP #1

STEP #2

STEP #3

STEP #4

STEP #5

INITIAL SET-UP/ADJUSTMENTS

The grind can be set from fine to very coarse. The grind may be adjusted for use in most commercial coffee

brewers. The following procedures should be used to make adjustments.

NOTE - A change in the burr adjustment will also change the amount dispensed. Any adjustment to the burrs should

be followed by an adjustment of the timer dials.

Burr Adjustment

1. Unplug the grinder and empty all beans from the hopper(s).

2. Plug-in the grinder, place funnel with filter into the funnel rails. Momentarily press the Off/On/Start switch to the “START” (lower) position (with desired hopper selected) and release, run a few grind cycles until all of the coffee in the grind chamber is dispensed.

3. Remove the funnel with filter and carefully tip the grinder over on it’s back.

4. Place the Off/On/Start switch in the “START” (lower) position and, using the grind adjustment key provided, slowly turn the adjusting screw in a clockwise

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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 the sound).

5. Make a mark with a pen on the decal to note the position of the arrow on the grind adjustment screw.

6. The following settings approximately correspond to the CBC recognized grinds. All are referenced from the arrow position marked in step #5.

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 10 hash marks in a counterclockwise direction.

NOTE: Exact adjustment will vary according to bean roast or added flavoring.

SCHEMATIC WIRING DIAGRAM

LPG2E

NL1

GRN

SELECTOR

BLK

SWITCH

GRN

WHI

2 3

BLU

YEL

WHI/BLK

BLK

RED

VIO

ORA

RED

RED RED

WHI

BLK

GRINDER

WHI

RED RED

RED

RT SOL

SLIDE GATES

RED

SOL

WHI

OFF/ON/START

TIMER ASSY.

(Hopper Slide Gate Timer Dial Wiring) Right - Brown Left - Orange

SWITCH

120 VOLTS AC

SINGLE PHASE

AMP

2 WIRE

60 HZ

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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.

• Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.

• All electronic components have ac voltage and dc voltage potential on their terminals. Shorting of

terminals or the application of external voltages may result in board failure.

• 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.

• Make certain that all electrical connections are tight and isolated.

WARNING

• Exercise extreme caution when servicing electrical equipment.

• Turn power OFF when servicing, except when electrical tests are specified.

• Follow recommended service procedures.

• Replace all protective shields or safety notices.

Problem

Grinder will not start.

Probable Cause

1. No power or incorrect voltage

2. Off/On/Start switch

3. Circuit Breaker (Not applicable on Model LPG with capacitor)

Remedy

(A) Plug-in the grinder. (B) Check the voltage at the wall outlet with a voltmeter. It must be 120 volts ac for 120 volt models, 100 volts for 100 volt models, and 230 volts for 230 volt models.

(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 14

Press the “Reset” button, located on rear of the grinder. 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

- Circuit Breaker for testing procedure. See page 9

4. Timer

Refer to

Service

- Timer for testing

procedures. See page 16

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TROUBLESHOOTING (cont.)

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