Bunn GMB-PS User Manual

BUNN

ponent!

WARNING

oval of any panel or ent of any com

Disconnect from power source

before rem

replacem

GMB-PS

S I D

: F I

. CRACKED . SCRATCHED . BOILED DRY . HEATED WHEN EMPTY . USED ON HIGH FLAME . OR EXPOSED ELECTRIC

ELEMENTS

U J N

1985 BUNN-O-MATIC CORPORATION

U L I

PN: 658

F F

OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

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

INTRODUCTION

This equipment will brew a half-gallon batch of coffee into an awaiting dispenser at the push of a button and

includes a hot water faucet for allied beverage use. It is only for indoor use on a sturdy counter or shelf.

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 two 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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USER NOTICES

Carefully read and follow all notices in this manual and on the equipment. All labels on the equipment should

be kept in good condition. Replace any unreadable or damaged labels.

This equipment is to be installed to

comply with the Basic Plumbing Code of

the Building Officials and Code

Administrators International, Inc. (BOCA)

and the Food Service Sanitation Manual

of the Food and Drug Administration (FDA).

#00656.0000 #10044.0000

WARNING

! WARNING

DISCARD DECANTER IF:

° CRACKED ° SCRATCHED ° BOILED DRY ° HEATED WHEN EMPTY

FUNNEL CONTENTS

ARE HOT

READ THE ENTIRE OPERATING MANUAL

BEFORE USING THIS PRODUCT

FAILURE TO COMPLY RISKS INJURY

#00658.0000

° USED ON HIGH FLAME OR EXPOSED ELECTRIC ELEMENTS

Fill water tank before turning -on thermostat or connecting appliance to power source. Use only on a properly protected circuit capable of the rated load. Electrically ground the chassis. Follow natinal/local electrical codes. Do not use near combustibles.

FAILURE TO COMPLY RISKS EQUIPMENT

DAMAGE, FIRE, OR SHOCK HAZARD

READ THE ENTIRE OPERATING MANUAL

BEFORE BUYING OR USING THIS PRODUCT

THIS APPLIANCE IS HEATED WHENEVER

CONNECTED TO A POWER SOURCE

#00831.0000

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ELECTRICAL REQUIREMENTS

CAUTION - The brewer must be disconnected from the power source until specified in

Model 15 has an attached cordset and requires 2-wire grounded service rated 120 volts ac, 15 amp, single

phase, 60 Hz.

L2 RED

WHITE

NEUTRAL L1 BLACK

120V.A.C.

WHITE

NEUTRAL

L1 BLACK

P2185

120 V.A.C.

208 OR 240 V.A.C.

120 V.A.C.

P1841

Initial Set-Up.

P2193

Model 20 requires 2-wire, grounded service rated 120 volts ac, 20 amp, single phase, 60 Hz. Proceed as follows:

Model 35 requires 3-wire, grounded service rated 120/208 or 120/240 volts ac, 20 amp, single phase, 60 Hz. Proceed as follows:

“A" & "B” models require 2wire, grounded service rated 200 volts ac or 240 volts ac, 20 amp, single phase, 50 Hz. Proceed as follows:

Electrical Hook-Up

CAUTION – Improper electrical installation will damage electronic components.

1. An electrician must provide electrical service as specified.

2. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.

3. Remove the rear panel.

4. Feed the cord through the strain relief and connect it to the terminal block.

5. Connect the brewer to the power source and verify the voltage at the terminal block before proceeding. Replace the rear panel.

6. If plumbing is to be hooked up later be sure the brewer is disconnected from the power source. If plumbing has been hooked up, the brewer is ready for

Initial Set-Up

PLUMBING REQUIREMENTS

This brewer must be connected to a cold water system with operating pressure between 20 and 90 psi (138

and 620 kPa) from a 1⁄2" or larger supply line. A shut-off valve should be installed in the line before the brewer. Install a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345 kPa). The water inlet fitting is 1⁄4" flare.

NOTE - Bunn-O-Matic recommends 1⁄4" copper tubing for installations of less than 25 feet and 3⁄8" for more than 25 feet from the 1⁄2" water supply line. A tight coil of copper tubing in the water line will facilitate moving the brewer to clean the countertop. Bunn-O-Matic does not recommend the use of a saddle valve to install the brewer. The size and shape of the hole made in the supply line by this type of device may restrict water flow.

This equipment must be installed to comply with the Basic Plumbing Code of the

Building Officials and Code Administrators International, Inc. (BOCA)

and the Food Service Sanitation Manual of the Food and Drug Administration (FDA).

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PLUMBING REQUIREMENTS (cont.)

1. Attach the flare fitting from the short piece of tubing on the strainer

(supplied) to the water inlet fitting at the left rear of the brewer.

2. Flush the water line and securely attach it to the flare fitting on the

strainer.

3. Turn on the water supply.

4. Place an empty vessel beneath the faucet and lift the handle until water

is dispensed.

P1939

INITIAL SET-UP

CAUTION - The brewer must be disconnected from the power source throughout the initial set-up, except when

specified in the instructions.

1. Insert an empty funnel into the funnel rails.

2. Place an empty dispenser under the funnel.

3. Connect the brewer to the power source, place the "ON/OFF" switch in the "ON" upper position, and momentarily

press and release the start switch. Water will begin flowing into the tank. When water stops flowing into the tank, initiate a second, third and a fourth brew cycle. During the fourth brew cycle the tank will fill to its capacity and the excess water will flow from the sprayhead, out of the funnel, and into the dispenser.

4. When the flow of water from the funnel stops, wait approximately twenty minutes for the water in the tank to

heat to the proper temperature. Some water will drip from the funnel during this time; this is due to expansion and should not occur thereafter.

5. Empty the dispenser and initiate another brew cycle.

6. Place the "ON/OFF" switch in the lower "OFF" position after water has stopped flowing from the funnel, and let

the water in the tank reheat to the proper temperature.

7. Place the "ON/OFF" switch in the "ON" upper position, and momentarily press and release the start switch. Check

the water volume in the dispenser after water has stopped flowing from the funnel. It should be 64 ounces.

8. If not, adjust the brew timer as required. See

measure another brew cycle.

9. Repeat step 8 until 64 oz water volume is achieved.

10. The brewer is now ready for use in accordance with the coffee brewing instructions on the next page.

Adjusting Brew Volumes.

Allow the water to reheat, start, and

ADJUSTING BREW VOLUMES

CAUTION - Disconnect the power source from the brewer prior to the removal of any panel for the replacement

or adjustment of any component. NOTE: Prior to setting or modifying batch sizes, check that the brewer is connected to water supply, the tank is properly filled, and a funnel and server are in place.

1. Modifying batch sizes. To modify a batch volume, first check that the SET/LOCK switch is in the "SET"

position on the circuit board. To increase a batch size. Press and hold the START or BREW switch until three clicks are heard. Release the switch (Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory) and press it again one or more times. Each time the switch is pressed, two seconds are added to the brew time period. Allow the brew cycle to finish in order to verify that the desired volume has been achieved.

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ADJUSTING BREW VOLUMES (cont.)

To decrease a batch size. Press and release the START or BREW switch once for every two-second interval

to be removed from the total brew time period; then immediately press and hold down the START or BREW switch until three clicks are heard. Release the switch. (Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory). Allow the brew cycle to finish in order to verify that the desired volume has been achieved.

2. Setting batch sizes. To set a batch volume, first check that the SET/LOCK switch is in the "SET" position on the circuit board. Press and hold the START or BREW switch until three distinct clicks are heard, and then release the switch. (Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory). View the level of the liquid being dispensed. When the desired level is reached, turn the ON/OFF switch to "OFF" (lower). The brewer remembers this volume and will continue to brew batches of this size until the volume setting procedure is repeated.

NOTE: When brewing coffee, batch volumes will decrease due to absorption by the coffee grounds.

3. Setting programming disable feature. If it becomes necessary to prevent anyone from changing brew times once programmed, you can set the SET/LOCK switch to the "LOCK" position. This will prevent any programming to be done until switch is once again placed in the "SET" position.

OPERATING CONTROLS

ON/OFF SWITCH

Placing the "ON/OFF" switch in the "OFF" lower position stops brewing. Stopping a brew cycle after it has been

started will not stop the flow of water into the funnel until the tank syphons down to its proper level. Placing the switch in the "ON" upper position supplies power to the brew circuit.

START SWITCH

Momentarily pressing and releasing the switch starts a brew cycle when the "ON/OFF" switch is in the "ON" upper

position.

NOTE – The "ON/OFF" switch must be in the "ON" upper position to initiate and complete a brew cycle.

COFFEE BREWING

1. Insert a BUNN® filter into the funnel.

2. Pour the fresh coffee into the filter and level the bed of grounds by gently shaking.

3. Slide the funnel into the funnel rails.

4. Place an empty dispenser beneath the funnel.

5. Place the "ON/OFF" switch in the "ON" upper position. Momentarily press and release the start switch.

6. When brewing is completed, simply discard the grounds and filter.

CLEANING

1. 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.

2. Check and clean the sprayhead. The sprayhead holes must always remain open.

3. With the sprayhead removed, insert the deliming spring (provided) all the way into the sprayhead tube. When inserted properly, no more than two inches of spring should be visible. Saw back and forth five or six times.

NOTE – In hard water areas, this may need to be done daily. It will help prevent liming problems in the brewer and takes less than a minute.

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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 120 volt ac and low voltage dc 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.

• Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are

energized for more than ten minutes without a supply of water.

• The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will help

to avoid twists and kinks in the tubing.

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

• This brewer is heated at all times. Keep away from combustibles.

WARNING – • Exercise extreme caution when servicing electrical equipment.

• Unplug the brewer when servicing, except when electrical tests are specified.

• Follow recommended service procedures

• Replace all protective shields or safety notices

PROBLEM

Brew cycle will not start

PROBABLE CAUSE

1. No water

2. No power or incorrect voltage to the brewer

REMEDY

Water lines and valves to the brewer must be open.

(A1) Check the power cord for 120 volts across the black and white terminals on two wire 120 volt brewers. (A2) Check the terminal block for 120 volts across the black and white terminals on two wire 120 volt brewers. (A3) Check the terminal block for 120 volts across the red and white terminals and the black and white terminal on three wire 120/208 volt or 120/240 volt brewers. (A4) Check the terminal block for 200 volts on "B Series" brewers or 240 volts on "A Series" brewers across the red and black terminals.

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(B) Check circuit breakers or fuses.

27479 091596

TROUBLESHOOTING (cont.)

PROBLEM

Brew cycle will not start (cont.)

PROBABLE CAUSE REMEDY

3. ON/OFF Switch

Refer to for testing. See page 16

4. Start Switch

Refer to testing procedures. See page 18

5. Timer

Refer to procedures. See page 20 or 21

6. Solenoid Valve

Refer to for testing procedures. See page 17

7. Water flow control (.222 GPM)

(A) Direction of flow arrow must be pointing towards brewer.

(B) Remove the flow control and check for obstructions. Clear or replace.

Service

- ON/OFF Switch

- Start Switch for

- Timer for testing

- Solenoid Valve

Water is not hot

8. Water strainer

1. Limit Thermostat CAUTION - Do not eliminate or bypass limit thermostat. Use only BOM replacement #29329.1000

2. Control Thermostat

3. Tank Heater

(A) Direction of flow arrow must be pointing towards brewer.

(B) Remove strainer and check for obstructions. Clear or replace.

Refer to

Service

- Limit Thermostat for testing procedures. See page 15

Refer to

Service

- Control Thermostat for testing procedures. See page 14

Refer to

Service

- Tank Heater for

testing procedures. See page19

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