Bunn TB6Q, TB6, TB3Q-LP User Manual

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TB3/TB6 Series

Including: TB3; TB3-LP;

TB3Q; TB3Q-LP; TB6; TB6Q

STARTING WITH SERIAL NUMBER: TU00020000

SERVICE & REPAIR MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

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

41722.0000A 07/09 ©2009 Bunn-O-Matic Corporation

BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY

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 parts and 1 year labor.

4)Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis: parts and labor for 3 years or 30,000 pounds of coffee, whichever comes first.

These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the applicable warranty period. This warranty does not apply to any equipment, component or part that was not manufactured by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect, alteration, improper installation or operation, improper maintenance or repair, damage or casualty. This warranty is conditioned on the Buyer 1) giving 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; 2) if requested by BUNN, shipping the defective equipment prepaid to an authorized BUNN service location; and 3) receiving prior authorization from BUNN that the defective equipment is under warranty.

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.

If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its exclusive option while the equipment is under warranty, shall either 1) provide at no charge replacement parts and/or labor (during the applicable parts and labor warranty periods specified above) to repair the defective components, provided that this repair is done by a BUNN Authorized Service Representative; or 2) shall 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, AT BUNN’S SOLE OPTION AS SPECIFIED HEREIN, TO REPAIR, 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.

BrewWISE, BrewLOGIC, BrewMETER, BrewWIZARD, Bunn Gourmet, BUNN Gourmet Ice, BUNN Pour-O-Matic, BUNN, Bunn-OMatic, Bunn-O-Matic, BUNNlink, BUNNserve, BUNNSERVE, BUNN Espress, Cool Froth, DBC, Dr. Brew, Dual, EasyClear, EasyGard, Easy Pour, FlavorGard, Gourmet Ice, Gourmet Juice, High Intensity, IMIX, Infusion Series, Intellisteam, Quality Beverage Equipment Worldwide, The Mark of Quality in Beverage Equipment Worldwide, My Café, PowerLogic, Safety-Fresh, Scale-Pro, Silver Series, Single, Smart Funnel, Smart Hopper, SmartWAVE, Soft Heat, SplashGard, System III, ThermoFresh, 392, AutoPOD, AXIOM, Beverage Profit Calculator, Beverage Bar Creator, BUNNsource, Coffee At Its Best, Digital Brewer Control, Nothing Brews Like a BUNN, Pouring Profits, Pulse Wave, Signature Series, Smart Heat, Tea At Its Best, The Horizontal Red Line, Titan, Ultra, are either trademarks or registered trademarks of Bunn-O-Matic Corporation.

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41722 012609

 

 

Contents

Trouble Shooting..............................................................................................................

4

Component Acess ..........................................................................................................

10

Control Thermostat.........................................................................................................

10

Limit Thermostat............................................................................................................

12

Tank Heater.....................................................................................................................

13

Lighted ON/OFF Switch...................................................................................................

14

Non Lighted ON/OFF Switch...........................................................................................

15

Start Switches................................................................................................................

16

Inlet Solenoids................................................................................................................

17

Dual Timer (TB3/TB6).....................................................................................................

18

Digital Timer (TB3Q/TB6Q).............................................................................................

20

Schematic Wiring Diagrams..........................................................................................

22

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41722 070209

 

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

PROBABLE CAUSE

REMEDY

Brew cycle will not start

1.

No water

 

2.

No power or incorrect voltage

 

to the brewer

Water lines and valves to the brewer must be open.

(A1) Check the wire crimps for

120 volts across the black and white terminals on two wire 120 volt brewers.

(A2) Check the wire crimps for

200 volts on "B Series" brewers or 230 volts on "A Series" brewers across the red and black terminals.

(B) Check circuit breakers or fuses.

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41722 070209

 

TROUBLESHOOTING (cont.)

 

 

 

PROBLEM

PROBABLE CAUSE

REMEDY

Brew cycle will not start (cont.)

3. ON/OFF Switch

Refer to Service - ON/OFF

 

 

 

Switch for testing.

 

4.

Start Switch

Refer to Service - Start Switch

 

 

 

for testing procedures.

 

5.

Timer

Refer to Service - Timer for test-

 

 

 

ing procedures.

 

6.

Solenoid Valve

Refer to Service - Solenoid Valve

 

 

 

for testing procedures.

 

7.

Water strainer/flow control

(A) Direction of flow arrow must

 

 

(If equipped)

be pointing towards brewer.

 

 

 

(B) Remove the strainer/flow

 

 

 

control and check for obstruc-

 

 

 

tions. Clear or replace.

Water is not hot

1. (A) Limit Thermostat

Refer to Service - Limit Ther-

 

 

(B) Thermal Cut-Off (230V)

mostat for testing procedures.

 

CAUTION - Do not eliminate

Thermal Cut-Off for testing

 

or bypass limit thermostat or

procedures.

 

thermal cut-off. Use only BOM

 

 

replacement parts.

 

 

2.

Control Thermostat

Refer to Service - Control Ther-

 

 

 

mostat for testing procedures.

 

3.

Tank Heater

Refer to Service - Tank Heater

 

 

 

for testing procedures.

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TROUBLESHOOTING (cont.)

 

PROBLEM

PROBABLE CAUSE

Inconsistent beverage level in

1. Strainer /flow control

dispenser

(If equipped)

2. Syphon System

3. Lime Build-up

CAUTION - Tank and tank components should be delimed regularly depending on local water conditions. Excessive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks.

4. Water Pressure

Consistently low beverage level

1.

Timer

in the dispenser

 

 

 

2.

Strainer/flow Control

 

(If equipped)

Spitting or excessive steaming

1. Lime Build-up

 

CAUTION - Tank and tank com-

 

ponents should be delimed

 

regularly depending on local

 

water conditions. Excessive min-

 

eral build-up on stainless steel

 

surfaces can initiate corrosive

 

reactions resulting in serious

 

leaks.

 

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REMEDY

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

(B)Remove the strainer/flow control and check for obstruction. Clear or replace.

The brewer must be level or slightly lower in front to syphon properly.

Inspect the tank assembly for excessive lime deposits. Delime as required.

The water pressure to the brewer must be at least 20 psi (138kPa) and minimum 1.0 gpm flow rate.

Timer dial must indicate at least two minutes and fifteen seconds. Refer to Operating Manual.

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

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

Inspect tank assembly for excessive lime deposits. Delime as required.

41722 070209

TROUBLESHOOTING (cont.)

PROBLEM

Spitting or excessive steaming (cont.)

Dripping from sprayhead

Water flows into tank continuously (ON/OFF Switch "ON")

Water flows into tank continuously (ON/OFF Switch "OFF")

Beverage overflows dispenser

PROBABLE CAUSE

2. Control Thermostat

1.Syphon System

2.Lime Build-up

CAUTION - Tank and tank components should be delimed regularly depending on local water conditions. Excessive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks.

3. Solenoid Valve

1. Timer

1. Solenoid Valve

1.Dispenser

2.Timer

3.Solenoid Valve

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REMEDY

Refer to Service - Control Thermostat for testing procedures.

The brewer must be level or slightly lower in front to syphon properly.

Inspect the tank assembly for excessive lime deposits. Delime as required.

Remove the solenoid valve and clear any obstructions. Rebuild or replace the valve if necessary.

Refer to Service - Timer for testing procedures.

Remove the Solenoid Valve and clean any obstruction. Rebuild or replace the valve if necessary.

The dispenser must be completely empty before starting a brew cycle.

Refer to Service - Timer for testing procedures.

Remove the Solenoid Valve and clean any obstruction. Rebuild or replace the valve if necessary.

41722 070209

TROUBLESHOOTING (cont.)

 

 

PROBLEM

PROBABLE CAUSE

Weak beverage

1. Filter Type

 

2.

Coffee Grind

 

3.

Sprayhead

 

4.

Funnel Loading

 

5.

Water Temperature

Dry coffee grounds remain in the

1. Funnel Loading

funnel

 

Brewer is making unusal noises

1. Solenoid

2. Plumbing Lines

3. Water Supply

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REMEDY

BUNN® paper filters must be used for proper extraction.

A fine or drip grind must be used for proper extraction.

A six-hole stainless steel sprayhead must be used for proper extraction.

The BUNN® paper filter must be centered in the funnel and the bed of ground leveled by gentle shaking.

Place an empty funnel on an empty dispenser beneath the sprayhead. Initiate a brew cycle and check the water temperature immediately below the sprayhead with a thermometer. The reading should not be less than 200°F (93°C). Adjust the control thermostat to increase the water temperature. Replace if necessary.

The BUNN® paper filter must be centered in the funnel and the bed of grounds leveled by gently shaking.

The nut on the solenoid must be tight or it will vibrate during operation.

Plumbing lines should not resting on the counter top.

(A)The brewer must be connected to a cold water line.

(B)Water pressure to the brewer must not exceed 90 psi (620 kPa). Install a regulator if necessary to lower the working pressure to approximately 50 psi (345 kPa).

41722 070209

TROUBLESHOOTING (cont.)

 

 

PROBLEM

PROBABLE CAUSE

REMEDY

Brewer is making unusal noises

4. Tank Heater

Remove and clean lime off the

(cont.)

 

tank heater.

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41722 070209

 

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