Bunn Dual TF User Manual

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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 two half-gallon, gallon, or gallon and three forths batches of coffee into awaiting servers at the push of a button. The brewer is also equipped with a hot water faucet for allied beverage use and is designed to interface with a BUNN® Grinder. The brewer is specifically designed for use with BUNN® .5 gallon and 1.75 gallon servers. 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.

Page 2

27124 050800

00831.0000

! WARNING

ELECTRICAL REQUIREMENTS

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

L2 RED

200 or 240V A.C.

L1 BLACK

Requires 2-wire, grounded service rated 200 to 240 volts ac, 30 amp, single phase 50 or 60 Hz.

L2 RED

WHITE

NEUTRAL

L1 BLACK

120V A.C.

208 or 240V A.C.

120V A.C.120V A.C.

Requires 3-wire, grounded service rated 120/208 or 120/240 volts ac, 30 amp, single phase, 60 Hz.

HOT WATER

Initial Set-Up.

Page 3

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 front panel beneath the sprayheads.

Models with electronic control assemblies:

Place the tank heater switch at the top of the control assembly in the “OFF” position.

Models with electro/mechanical thermostats:

Rotate the control thermostat knob fully counterclockwise to the “OFF” position.

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 front 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).

PLUMBING HOOK-UP

1. Flush the water line and securely attach it to the flare fitting or quick disconnect located on bottom of brewer.

2. Turn on the water supply.

INITIAL SET-UP

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

specified in the instructions. NOTE: ECA Models Only -This brewer is equipped with a temperature sensor that indicates when to brew and, when selected, locks-out the start of a brew cycle until the water has heated to the optimum brewing temperature.

1. Remove the front panel beneath the sprayhead.

Models with electronic control assemblies:

Place the tank heater switch at the top of the control assembly in the “OFF” position.

Models with electro/mechanical thermostats:

Rotate the control thermostat knob fully counterclockwise to the “OFF” position.

2. Connect the brewer to the power source. Water will begin flowing into the tank.

3. When water stops flowing into the tank, remove the front panel and proceed as directed:

Models with electronic control assemblies:

Place the tank heater switch at the top of the control assembly in the “ON” position and replace the front panel.

Models with electro/mechanical thermostats:

Rotate the control thermostat knob fully clockwise to the “ON” position and replace the front panel.

Page 4

27124 062100

INITIAL SET-UP (cont.)

4. Wait approximately twenty minutes for the water in the tank to heat to the proper temperature.

5. Place an empty server beneath either of the brew stations. Place its associated Selector switch in the desired position, the On/Off switch in the upper position and initiate a brew cycle.

6. Place the On/Off switch in the lower “OFF” position after water has stopped flowing from the funnel, and check the water volume in the server. It should be 64 oz (1/2 gallon), 128 oz (1 gallon), 224 oz (1-3/4 gallon) or adjust volume to your company specifications. On models with Digital Timers, refer to adjustments.

NOTE: Brewer will not operate if the server size does not match the selected batch size.

7. (A) If not, disconnect the brewer from the power source, remove the front panel, and adjust the brew timer for that brew station as required. Replace the front panel, connect the brewer to the power source, allow the water to reheat, start, and measure another brew cycle. (B) If necessary adjust the needle valve to achieve desired water volume to be bypassed around the coffee filter in the funnel. NOTE: To increase the water bypass turn the needle valve counterclockwise, to decrease the water bypass turn the needle valve clockwise. An adjustment of the needle valve will require a timer adjustment for volume of 1 gallon and 1-3/4 gallon.

8. Repeat step 7 until the proper water volume is achieved.

9. Repeat steps 5 through 8 for the other brew station.

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

Service

section for

OPERATING CONTROLS

BREW SELECTOR SWITCH

Placing the switch in the 1⁄2 Gal, 1 Gal, or 1-3⁄4 Gal position selects the amount of coffee to be brewed in

subsequent brew cycles. Repositioning this switch after a brew cycle has been initiated does not change the brew batch in progress.

ON/OFF SWITCH

Placing the switch in the unlighted lower position cuts power to the server sensor and stops brewing. Stopping

a brew cycle after it has been started will not stop the flow of water from the funnel. Placing the switch in the lighted upper position supplies power to the server sensor and enables the brew circuit.

START SWITCH

Momentarily pressing and releasing this switch starts a brew cycle when the On/Off switch is in the lighted

upper position.

GRINDER SELECTOR SWITCH

Pressing the right or left side of the switch selects the corresponding brew station to the grinder interface.

NOTE – The On/Off switch must be in the lighted upper position to initiate and complete a brew cycle.

COFFEE BREWING

1. Select the desired batch size.

2. Insert a BUNN® filter into the funnel.

3. Pour the proper amount of fresh ground coffee into the filter and level the bed of grounds by gently shaking.

4. Slide the funnel into the funnel rails.

5. Place an empty server under the funnel that matches the selected batch size.

6 Place the On/Off switch in the lighted upper position. Momentarily press and release the start switch.

7. 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.

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.

Page 5

27124 062100

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 - 240 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 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.

• Disconnect the brewer from the power source when servicing, except when electrical tests are

specified.

• Follow recommended service procedures.

• Replace all protective shields or safety notices.

Problem Probable Cause Remedy

Equipment will not operate.

1. No power or incorrect voltage.

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

(B) Check circuit breakers or fuses.

Brew cycle will not start.

1. Server

Make sure the server size agrees with the batch selection (.5 gallon = .5 gallon, 1.75 gallon = 1 & 1.75 gallon)

2. No water

Check plumbing and shut-off valves

Page 6

27124 050800

TROUBLESHOOTING (cont.)

Problem

Brew cycle will not start (cont.)

Probable Cause

3. Water strainer/flow control (.750 GPM)

4. ON/OFF switch

5. Start switch

6. Timer

7. Dispense Valve

Remedy

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

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

Refer to

Service

- ON/OFF switch for

testing procedures. See page 28

Refer to

Service -

Start switch for

testing procedures. See page 34

Refer to

Service -

Timer for testing

procedures. See page 36 or 38

Refer to

Service -

Dispense valve for

testing procedures. See page 19

Automatic refill will not operate

8. Control Assembly (Electronic)

9. Brew selector switch

10. Server sensor

1. No water

2. Water strainer/flow control (.750 GPM)

3. Solenoid Valve (Inlet)

Refer to

Service

- Control assembly for testing procedures. See pages 20 thru 25

Refer to

Service

- Brew selector switch for testing procedures. See page 14

Refer to

Service

- Server sensor for

testing procedures. See page 29

Check plumbing and shut-off valves.

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

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

Refer to

Service

- Solenoid valve for

testing procedures. See page 33

Page 7

27124 062100

TROUBLESHOOTING (cont.)

Problem Probable Cause

Automatic refill will not operate

4. Overflow protection switch

(cont.)

5. (A) Level control board & level probe. (Electro/mechanical controlled)

(B) Electronic controls

Beverage level will not adjust (Se-

1. Brew Selector switch

lector switch in any position)

Water flows into tank continuously .

1. Solenoid valve

2. (A) Level control board and level probe (Electro/mechanical)

Remedy

Refer to

Service -

Overflow protection switch for testing procedures. See page 30

Refer to

Service

- Level control board

for testing procedures. See page 26

Refer to

Service

- Electronic controls for testing procedures. See page 20 thru 25

Refer to

Service

- Selector switch for

testing procedures. See page 14

Refer to

Service

- Solenoid valve for

testing procedures. See page 33

Refer to

Service

- Level control board

for test procedures. See page 26

Water flows into tank continuously (ON/OFF switch "ON").

Water from tank is not hot

(B) Control assembly (Electronic)

3. Overflow protection switch

1. Timer

1. Limit thermostat CAUTION - Do not eliminate or bypass limit thermostat. Use only replacement part #23717.0001

2. (A) Control Thermostat (Electro/ mechanical

Refer to

Service

- Control assembly for testing procedures. See page 20 thru 25

Refer to

Service

- Overflow protection switch for testing procedures. See page 30

Refer to

Service

- Timer for testing procedures. See page 36 or 38

Refer to

Service

-Limit thermostat

for testing procedures. See page 27

Refer to

Service

- Control Thermostat for testing procedures. See page 18

Page 8

27124 062100

TROUBLESHOOTING (cont.)

Problem

Water from tank is not hot (cont.).

Spitting or unusual steaming from sprayhead or airvents.

Probable Cause

(B) Control assembly (Electronic)

3. Contactor (Brewers with Recovery booster)

4. Tank heaters

5. Triac assembly (Electronic)

6. Relay (Brewers with Recovery Booster)

1. (A) Control thermostat (Electro/ mechanical)

Remedy

Refer to

Service

- Control assembly for testing procedure. See page 20 thru 25

Refer to

Service

- Contactor for test-

ing procedures. See page 16

Refer to

Service

- Tank heaters for

testing procedures. See page 35

Refer to

Service

- Triac assembly for

testing procedures. See page 24

Refer to

Service

- Relay for testing

procedures. See page 31

Refer to

Service

- Control thermostat for testing procedures. See page 18

Inconsistent beverage level in server.

(B) Control assembly (Electronic)

2. Triac assembly (Electronic)

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.

1. Strainer/flow control (.750 GPM)

Refer to

Service

- Control assembly for testing procedures. See page 20 thru 25

Refer to

Service

- Triac assembly for

testing procedures. See page 24

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

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

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

Page 9

27124 050800

TROUBLESHOOTING (cont.)

Problem Probable Cause Remedy

Inconsistent beverage level in server. (cont.)

Consistently high or low beverage level in server.

Dripping from sprayhead.

Water overflows filter.

2. Improper water pressure

3. Dispense valve

4. Bypass valve

1. Timer adjustment

1. Dispense valve

1. Bypass valve

Check the operating water pressure to the brewer. It must be between 20 and 90 psi (138 and 620 kPa).

Refer to

Service -

Dispense valve for

testing procedures. See page 19

Refer to

Initial Set-Up

on page 5 step

#7. For test procedure see page 13.

Adjust the timer as required to achieve the recommended volume for each brew cycle.

Refer to

Service

- Dispense valve for

testing procedures. See page 19

Refer to

Initial Set -Up

on page 5 step #7. For test procedures see page 13.

Beverage overflows server

2. Needle Valve

3. Type of paper filters

4. No sprayhead

1. Beverage left in server

2. Timer adjustment

3. Dispense valve

Refer to

Initial Set-Up

on Page 5 step #7. . BUNN® paper filters should be used for proper extraction.

Check sprayhead

The brew cycle should be started only with an empty server under the funnel.

Adjust the timer as required to achieve the recommended volume for each brew cycle. Refer to

Service

- Timer for testing procedures. See page 36 or 38

Refer to

Service

- Dispense valve for

testing procedures. See page 19

Page 10

27124 050800

TROUBLESHOOTING (cont.)

Problem Probable Cause Remedy

Weak beverage

1. Type of paper filters

2. Coffee

3. Sprayhead

4. Funnel loading

5. Water temperature

®

BUNN

paper filters should be used

for proper extraction.

A sufficient quantity of fresh drip or regular grind should be used for proper extraction.

B.O.M. sprayhead #01082.0002 should be used to properly wet the bed of ground coffee in the funnel.

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

Empty the server, remove its cover. Place empty funnel over the server entrance, with ON/OFF switch in the "ON" position press the start switch and release it. Check the water temperature immediately below the sprayhead with a thermometer. The

reading should not be less than 195° F (76° C).

Brewer is making unusual noises.

1. Solenoid (Inlet)

2. Plumbing lines

3. Water supply

4. Tank Heaters

5. Contactor

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

Plumbing lines should not be resting on the counter top.

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

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

Remove and clean lime off tank heaters.

Check for low voltage

Page 11

27124 050800

SERVICE

Contents

This section provides procedures for testing and replacing various major components used in this brewer should service become necessary. Refer to

Troubleshooting

for assistance in determining the

cause of any problem.

WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel. The brewer should be unplugged when servicing, except when electrical tests are required and the test procedure specifically states to plug-in the brewer.

COMPONENT ACCESS

WARNING - Unplug the brewer before the removal of

any panel or the replacement of any component.

All components are accessible by the removal of the top cover, front inspection panel and server platform.

Brew Selector Switch............................................ 14

Bypass Valve ........................................................ 13

Contactor Assembly.............................................. 16

Control Thermostat............................................... 18

Dispense Valve ..................................................... 19

Electronic Control .................................... 20 thru 25

Grinder Selector Switch ........................................25

Level Control Board and Level Probe .................... 26

Limit Thermostat .................................................. 27

ON/OFF Switch...................................................... 28

Overflow Protection Switch .................................. 30

Relay .................................................................... 31

Server Sensor ....................................................... 29

Solenoid ............................................................... 33

Start Switch (Brew) .............................................. 34

Tank Heaters.........................................................35

Timers ............................................................. 36,38

Wiring Diagrams...................................... 40 thru 47

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DISCONNECT FROM POWER SOURCE BEFORE REMOVAL OF ANY PANEL OR

REPLACEMENT OF ANY COMPONENT!

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OPERATING PROCEDURES

1.Check Server size if

Brewer refuses to brew.

°F ± 5°

2.McDonald's Brew

Temperature: 200

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(3-18-96)

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HOT WATER

CAUTION

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The top cover is attached with four #4-40 slot-

ted head screws.

P970

The front inspection panel is attached with

seven #6-32 slotted head screws.

The sever platform is attached with four #6-32

slotted head screws.

Page 12

27124 062100

SERVICE (cont.)

1.5

.5

2.5

MINUTES

P/N 24486-0000 120 VAC

BUNN-O-MATIC

1.5

.5

2

.5

MINUTES

P/N 24486-0000 120 VAC

BUNN-O-MATIC

BYPASS VALVE

If voltage is not present as described refer to the wiring diagrams and check the brewer wiring harness.

5. Check for continuity across the bypass valve coil terminals.

If continuity is present as described, reconnect the white/green and white/ violet wires to the bypass valve, brew-lock if necessary and proceed to #6. If continuity is not present as described, replace the bypass valve.

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5 .

N

2

I

1.5

M

S

.

E

C

I

1

T

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U

S

A

E

N I

M

V

1

T

-

M

0

U

O

2

-

C

N

1

I

3

N

A

M

N

V

-

U

0

5

2

B

2

6

1

.5

2

C

S

4

I

0

N

E

/

T

0

T

P

A

0

U

7

0

M

-

N

6

I

O

8

-

M

3

4

N

4

N

2

U

8

N

B

5

/

P

3

2

S

1

6

2

E

T

U

.5

N

2

I

1.5

M

S

.

E

C I

1

T

C

U

A

S

A

N

E

I

M

V

-

1

T

M

0

O

U

2

-

C

N

1

N

I

3

A

N

M

-

V

U

0

2

B

2

6

1

.5

2

S

N

0

/

E

0

P

T

0

U

0

-

N

6

I

8

M

4 4 2

N / P

6. Check the bypass valve for coil action. Connect brewer to the power source. With the "ON/OFF" switch in the "ON" position press the start switch. Listen carefully in the vicinity of the by-pass valve for a "clicking" sound as the coil attracts and repels the plunger.

Location:

The bypass valves are located inside the right

front and the center front of the hood.

Test Procedures:

1. Disconnect the brewer from the power source and place 1-3/4 gallon server under funnel.

2. Disconnect the white/green wire and the white/ violet wire on the bypass valve.

NOTE: ECA MODELS ONLY - Brewer must be at

operating temperature to perform step #3 or brewlock must be bypassed. To bypass brew-lock disconnect white/orange and brown/black for right timer or orange and red/black for left timer from brew-lock of ECA and connect harness leads together.

3. Check the voltage across the white/green and the white/violet wires with a voltmeter. Connect the brewer to the power source. With the "ON/OFF" switch in the "ON' position, the selector switch in the 1 or 1-3/4 gallon position press the start switch. The indication must be: a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

4. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #5.

P971

If the sound is heard as described, there may be a blockage in the water line before the bypass valve or the bypass valve may require inspection for wear and removal of waterborne particles. If the sound is not heard as described, replace the bypass valve.

Removal and Replacement:

1. Remove the wires from the bypass valve.

2. Drain enough water from the tank so bypass valve is above the water line.

3. Remove water lines from bypass valve.

4. Remove the two nuts retaining the bypass valve inside the hood and remove bypass valve.

5. Remove hose barb fitting and attach to new bypass valve.

6. Install new bypass valve with hose barb fitting.

7. Reconnect the water tubes and the wires to the bypass valve.

8. Refer to the illustration below when reconnecting the wires.

WHI/GRN to Dispense Valve

WHI/VIO to Brew Selector Switch

LEFT AND RIGHT VALVE

P774

Page 13

SERVICE (cont.)

BREW SELECTOR SWITCH

present in any other position.

10. Check for continuity across the pink wire and gray wire on the selector switch when the switch is in the 1 gallon position. Continuity must not be present in any other position.

11. Reconnect the gray and tan wire on the selector switch to the gray and tan wires on the interface socket.

12. Reconnect the pink wire on the selector switch to the grinder switch.

N O I

N

T A R

O P R

O C C I

T

.

A

M

.

- S .

O

- U

N

,

N

S I

U

O

B

N I

Y

S

L

T

L

B

I

T

D

,

UN

A

N

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D

/

R

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S

W

E

U

I

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Z

F

: T

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S R

A

T N I

F

E N

R

U

H E

P

N

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B

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I W E O

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I

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.

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.

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IN

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A R E

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G

N

I

T

A

R

E

P

O

°F ± 5°

1. Check Server size if Brewer refuses to brew.

2. McDonald's Brew Temperature: 200 (3-18-96)

R E

T

N

A

O

C

I

E

T

D

U

R A

A

C

S I

D

:

!

F I

D E

K

D

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.

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E

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L

A

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O

D

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.

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P

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X

U

.

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T

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N

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P

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IS

E

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IC

O

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85

U

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19

A

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I A F

8 65

: N P

N

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T

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N

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Q

P972

Location:

The brew selector switches are located in the

front left and right side of the hood.

Test Procedure: Timer: Left or Right

1. Disconnect the brewer from the power supply.

2. Separate the connector on the selector switch harness from the brew timer circuit board.

3. Carefully slide the plastic cover off of the connector from the switch harness.

4. Check for continuity across the pink and tan wires on the connector when the switch is in the 1/2 gallon position. Continuity must not be present in any other switch position.

5. Check for continuity across the pink wire and gray wire when the switch is in the 1 gallon position. Continuity must not be present in any other position.

6. Reattach the connector to the brew timer circuit board.

Grinder Interface: Left or Right:

7. Disconnect the gray and tan wires on the selector switch from the gray and tan wires on the interface socket.

8. Disconnect the pink wire on the selector switch from the grinder switch.

9. Check for continuity across the pink wire and tan wire on the selector switch when the switch is in the 1/2 gallon position. Continuity must not be

Bypass Valve: Left or Right

13. Disconnect the white/violet on the selector switch from the bypass valve coil and disconnect the white/red from the dispense valve coil.

14. Check for continuity across the white/violet and the white/red wires when the selector is in the 1 gallon and 1-3/4 gallon position. Continuity must not be present in any other position.

15. Reconnect the white/violet to the bypass valve coil and white/red to the dispense valve coil.

Server Sensor: Left or Right

16. Disconnect the yellow, white/orange and the orange wires on the selector switch from the yellow, white/orange and orange wires of the brewer wiring harness.

17. Check for continuity across the white/orange and yellow wires on the selector switch when the switch is in the 1/2 gallon position. Continuity must not be present in any other position.

18. Check for continuity across the white/orange and orange wires of the selector switch when the switch is in the 1 gallon and 1-3/4 gallon position. Continuity must not be present in any other position.

19. Reconnect the yellow, white/orange and orange wires.

Removal and Replacement:

1. Disconnect the connector on the selector switch harness from the brewer timer circuit board.

2. Disconnect wires from the selector switch, interface socket, dispense valve, bypass valve and proximity sensor harness.

3. Loosen the set screw on the switch knob.

4. Remove the 9/16" nut and washer holding the switch to the hood.

5. Remove the switch.

Page 14

SERVICE (cont.)

BREW SELECTOR SWITCH (cont.)

6. Install the new switch. The positioning tab must be in the hole in the hood for proper switch and knob alignment.

7. Install the knob so that the arrow points to the 13/4 gallon position when the switch is turned to the full right position.

8. Reattach the connector to the brew timer circuit board.

9. Refer to the illustration below when reconnecting the wires.

WHI/VIO to Left or Right By-Pass Valve

ORA to Server Sensor ORA (Pin #3)

WHI/ORA To Left or Right Start Switch (Electro/mechanical) WHI/ORA to Interlock Assy (Electronic)

GRY from Left or Right Selector Switch to GRY Lead on Interface Socket

PNK from Left Selector Switch to Grinder Switch (Lower Left) PNK from Right Selector Switch to Grinder Switch (Lower Right)

TAN from Left or Right Selector Switch to TAN Lead on Interface Socket

YEL toServer Sensor YEL (Pin #4)

WHI/RED to Left or Right Dispense Valve

WHI/GRN to Left or Right Dispense Valve and Left or Right Bypass Valve

To Left or Right Timer

TAN

GRY

PNK

Page 15

P991

27124 050800

SERVICE (cont.)

CONTACTOR ASSEMBLY

Location:

The contactor assembly is located inside the

hood just to the rear of the right dispense valve.

Test Procedures: Mechanical Thermostat (Brewers with or without Recovery Booster)

1. Disconnect the brewer from the power source.

2. Disconnect the red wire of the two pole 200V or 240V terminal block or the white wire of the three 7920/208 2007920/2[(240V terminal blwer er))Tj TD-0.0402 ect tla blred wire of The contaccoil andight(Disconer))TjT*290402 ect tla blred wire of The role of Thermoswer fromer)

Page 16

SERVICE (cont.)

BLK to BLK Lead from Thermostat

BLK to White Lead from the Three Pole 120/208V or 120/240V Terminal Block BLK to Red Lead from the Two Pole 200V or 240V Terminal Block

RED T1 to Left Tank Heater RED T1 to Right Tank Heater

BLK T2 to Left Tank Heater BLK T2 to Right Tank Heater

BLK L2 to Terminal Block (Black Insert)

RED L1 to Terminal Block (Red Insert)

MECHANICAL THERMOSTAT W/RECOVERY BOOSTER

RED T1 to To Terminal Block (Red Insert )

BLK to WHI/BRN to Left Dispense Valve

BLK to GRY on Relay

BLU L1 to Left Tank Heater

ELECTRONIC CONTROL W/RECOVERY BOOSTER

CONTACTOR ASSEMBLY (cont.)

Test Procedures : Electronic Control (Brewers w/Recovery Booster)

1. Disconnect the brewer from the power source.

2. Disconnect the gray wire from the black wire on

the contactor coil and white /brown wire from the remaining black wire on the contactor coil.

NOTE: ECA MODELS ONLY - Brewer must be at

operating temperature to perform step #3 or brewlock must be bypassed. To bypass brew-lock disconnect white/orange and brown/black for right timer or orange and red/black for left timer from brew-lock of ECA and connect harness leads together.

3. Check the voltage across the gray wire and white/

brown with a voltmeter with both "ON/OFF" switches in the "ON" position. Connect the brewer to the power source and press both start switches. The indication must be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

4. Disconnect the brewer from the power source.

Removal and Replacement:

1. Remove all wires from the contactor.

2. Remove the two #10-32 slotted head screw securing contactor to the inside of the hood.

3. Securely install the new contactor inside the hood.

4. Refer to the following illustration when reconnecting the wires.

If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the wiring diagrams and check the brewer wiring harness.

5. Disconnect the blue and red wires from the contactor terminals. Check for continuity across the terminals of the contactor by manually closing the contacts. Continuity must not be present when the contact is released.

If continuity is present as described, reconnect the blue and red wires to the contactor terminals. Connect one black lead from the contactor coil to the gray wire and the white/brown wire to the remaining black lead of the contactor coil. Reconnect brew-lock wires to interlock of the ECA if necessary. The contactor is operating properly. If continuity is not present as described, replace the contactor.

P778

Page 17

27124 050800

P974

6. Gently remove the capillary bulb and grommet from the tank.

7. Check the voltage across the black wires of the control thermostat and the white insert on the three pole 120/208V, 120/240V terminal blocks and the red insert on two pole 200V, 240V terminal blocks with a voltmeter when the control thermo- stat is turned "ON" (fully clockwise). Connect the brewer to the power source. The indication must be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models. Voltage must not be indicated across these terminals when the thermostat is turned "OFF" (fully counterclockwise).

8. Disconnect the brewer from the power source.

If voltage is present as described, reinstall the capillary tube into the tank to the line 7" above the bulb, the control thermostat is operating properly. If voltage is not present as described, replace the thermostat.

Location:

The control thermostat is located inside the lower left front of the brewer on the component bracket.

1. Disconnect the brewer from the power source.

2. Locate the blue wire on the control thermostat.

3. Check the voltage across the blue wire on the

control thermostat and the white insert on three pole 120/208V, 120/240V terminal block and the red insert on two pole 200V, 240V terminal block with a voltmeter. Connect the brewer to the power source. The indication must be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

4. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the wiring diagrams and check the brewer wiring harness.

5. Locate the black wires from the control thermo-

stat.

Removal and Replacement:

1. Remove wires from the control thermostat.

2. Remove the thermostat capillary bulb by firmly pulling-up on the capillary tube at the tank lid. This will disengage the grommet from the tank lid.

3. Remove the #8-32 slotted head screw holding the control thermostat to the component bracket.

4. Slide the grommet to the line 7" above the bulb on the new capillary tube.

5. Insert the capillary bulb through the hole in the tank lid and press the grommet firmly and evenly so that the groove in the grommet fits into the tank lid.

6. Carefully bend the capillary tube so that the tube and bulb inside the tank are in the vertical position.

NOTE - The capillary tube must be clear of any electrical termination and not kinked.

7. Using a #8-32 slotted head screw fasten the control thermostat to the component bracket.

8. Refer to the illustration below when reconnecting the wires.

9. Adjust the control thermostat as required.

Page 18

SERVICE (cont.) CONTROL THERMOSTAT (cont.)

BLU to Left & Right Ready Lights BLU to RED Lead From Liquid Level Switch

BLK to BLK Lead of Contactor Coil

BLK toLeft & Right Ready Lights

DISPENSE VALVE

P780

P975

Location:

Dispense valves are located inside the hood in

the center of each sprayhead panel.

Test Procedures:

1. Disconnect the brewer from the power source. NOTE: ECA MODELS ONLY - Brewer must be at

operating temperature to perform step #2 or brewlock must be bypassed. To bypass brew-lock disconnect white/orange and brown/black for right timer or orange and red/black for left timer from brew-lock of ECA and connect harness leads together.

2. Disconnect the wires from the right dispense valve and check the voltage across the white/violet wire

Page 19

SERVICE (cont.)

12565.0004

DISPENSE VALVE (cont.)

WHI/VIO to Right Timer TL1 WHI/VIO to Right ON/OFF Switch WHI/RED to Right Brew Selector Switch

WHI/GRN to Right Timer TL4 WHI/GRN to Right By-Pass Valve

12565.0004

RIGHT

WHI/RED to Left Timer TL1 WHI/RED to Left Brew Selector Switch WHI/RED to Left ON/OFF Switch

WHI/BRN to Left Timer TL4 WHI/GRN to Left By-Pass Valve

LEFT

ELECTRONIC CONTROL ASSEMBLY

P782

1. Electronic Control

2. Terminal Block

3. Timers

4. Liquid Level Switch & Overflow Cup

5. Tank Heater

6. Limit Thermostat

7. Liquid Level Probe

8. Temperature Sensor

9. Dispense Valve

10. Recovery Booster Relay

11. Contactor Assembly

12. Bypass Valve

13. Ready Light

14. Solenoid Valve

15. LED

16. Temperature adjustment

17. Triac Assy

18. Server Sensor

Page 20

SERVICE (cont.)

ELECTRONIC CONTROL ASSEMBLY (cont.)

BREW START- LOCK

The water must be heated to the preset temperature indicated by the glowing ready light before a brew cycle can be initiated.

If the ready light goes out during a brew cycle, the cycle will continue until it is completed. You must wait until the ready light glows before starting another brew cycle.

PROBLEM:

LIQUID LEVEL CONTROL SYSTEM DOES NOT REFILL

PROBLEM:

LIQUID LEVEL CONTROL OVERFLOWS

DRAIN CUP

(4)

RETRY

OVERFLOW

?

YES

DRAIN CUP (4)

DISCONNECT PROBE

WIRE FROM PROBE (7)

SHORT PROBE WIRE

TO CHASSIS

RETRY

NO

OVERFLOW

?

NO

REPLACE PROBE (7)

OVERFLOW CUP FULL

(4)

NO

DISCONNECT LEVEL PROBE

(7)

VOLTAGE PRESENT AT

SOLENOID VALVE

(14)

NO

REPLACE CONTROL

ASSEMBLY (1)

YES

REMOVE POWER

(4)

DRAIN CUP

RETRY

DOES WATER FLOW

NO

REPLACE

SOLENOID VALVE

(14)

YES

REPLACE PROBE

(7)

P808

Page 21

YES

DRAIN CUP (4)

DISCONNECT WIRE

FROM

SOLENOID VALVE (14)

RETRY

YES

OVERFLOW

?

NO

REPLACE CONTROL

ASSEMBLY (1)

REPLACE SOLENOID

VALVE (14)

P809

Liquid Level Control Test Procedure:

1. Disconnect brewer from the power source.

2. Check the voltage across terminals 3 & 4 of the electronic control assembly (1) with a voltmeter. Connect brewer to power source. The indication must be:

a.) 208 volts ac for three wire 120/208 volt mod-

els and 240 volts ac for three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

27124 050800

SERVICE (cont.)

ELECTRONIC CONTROL ASSEMBLY (cont.)

3. Disconnect brewer from the power source.

If voltage was present as described, proceed to #4. If voltage was not present as described, refer to the wiring diagrams and check the brewer wiring harness.

4. Remove the pink wire from terminal 5 of the electronic control assembly (1).

5. Check the voltage across terminals 1 & 4 of the electronic control assembly (1) with a voltmeter. Connect brewer to the power source. The indication must be:

a.) 208 volts ac for three wire 120/208 volt mod-

els and 240 volts ac for three wire 120/240 volt models after a delay of approximately 1 second.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models after a delay of approximately 1 second.

6. Disconnect the brewer from the power source.

If voltage was present as described, the liquid level control system is operating properly, proceed to #7. If voltage was not present as described, replace the electronic control assembly (1) and temperature sensor (8) in the tank lid.

NOTE - each electronic control assembly is calibrated to a temperature sensor. Both components MUST be replaced as a set.

7. Reconnect the pink wire to terminal 5 of the electronic control assembly (1).

8. Remove the liquid level probe (7) from the tank lid, and inspect it for mineral deposits. Replace it if necessary. Keep the exposed ends of the probe away from any metal surface of the brewer.

9. Check the voltage across terminals 1 & 4 of the electronic control assembly (1) with a voltmeter. Connect the brewer to the power source. The indication must be:

a.) 208 volts ac for three wire 120/208 volt mod-

els and 240 volts ac for three wire 120/240 volt models after a delay of approximately 1 second.

b.) 200 to 240 volts ac for two wire 208 or 240 volt

Page 22

models after a delay of approximately 1 second.

10. Touch the screw head end of the probe to the brewer housing. The indication must be 0.

11. Move the probe away from the brewer housing. The indication must again be:

a.) 208 volts ac for three wire 120/208 volt mod-

els and 240 volts ac for three wire 120/240 volt models after a delay of approximately 1 second.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models after a delay of approximately 1 second.

12. Disconnect the brewer from the power source.

If voltage was present as described, reinstall the probe, the sensing function of the system is operating properly. If voltage was not present as described, check the pink probe wire and the green ground wire for continuity and/or replace the probe.

Temperature Control Flow Charts

PROBLEM:

WATER NOT HOT ENOUGH

TURN TEMPERATURE

LED ON CONSTANTLY

MEASURE VOLTAGE AT TANK HEATER (5)

VOLTAGE PRESENT

LIMIT THERMOSTAT (6)

OK

REPLACE CONTROL

ASSEMBLY (1)

MEASURE VOLTAGE AT TANK HEATER (5)

VOLTAGE PRESENT

RECHECK WATER

TEMPERATURE

NO

ADJUSTING SCREW (16)

CLOCKWISE CONTINUOUSLY

YES

LED ON

?

NO

REPLACE CONTROL

ASSEMBLY (1)

YES

REPLACE TANK

NO

?

YES

HEATER (5)

NO

CONTROL ASSEMBLY (1)

REPLACE LIMIT

THERMOSTAT (6)

REPLACE TRIAC (17)

CHECK FOR SPLIT

TANK HEATER (5)

REINSTALL ORIGINAL

ADJUST FOR CORRECT

WATER TEMPERARURE

P810

27124 050800

SERVICE (cont.)

ELECTRONIC CONTROLS (cont.)

PROBLEM:

WATER BOILS

DRAIN CUP (4)

RETRY

YES

NO

REPLACE CONTROL

ASSEMBLY (1)

CHECK FOR SPLIT

TANK HEATER (5)

REPLACE TRIAC (17)

LED (13)(15) ON WHILE BOILING

NO

DISCONNECT BLUE WIRE

FROM CONTROL BOARD PIN #7

RETRY

STILL BOILING

?

NO

REPLACE CONTROL

ASSEMBLY (1)

Temperature Control Test Procedure

P811

the temperature sensor (8) and the electronic control assembly (1).

NOTE - each temperature sensor is calibrated to an electronic control assembly. Both components MUST be replaced as a set.

7. Check the voltage across the tank heater (5) termi-

nals with a voltmeter. Connect the brewer to the power source. The indication must be:

a.) 208 volts for three wire 120/208 volt models

and 240 volts for three wire 120/240 volt models while the red indicator on the circuit board is on or blinking.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models while the red indicator on the circuit board is on or blinking.

8. Disconnect the brewer from the power source.

If voltage was present as described, the temperature control of the system is operating properly. If voltage was not present as described, contact BunnO-Matic to order an electronic control assembly (1), temperature sensor (8), and triac assembly (17) for revaluation and proceed to #9.

1. Disconnect the brewer from the power source.

2. Check the voltage across terminals 3 & 4 of the electronic control circuit board with a voltmeter. Connect the brewer to the power source. The indication must be:

a.) 208 volts ac for three wire 120/208 volt mod-

els and 240 volts ac for three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

3. Disconnect the brewer from the power source.

If voltage was present as described, proceed to #4. If voltage was not present as described, refer to the wiring diagrams and check the brewer wiring harness.

4. Connect the brewer to the power source and place the tank heater switch in the “ON” position.

5. Observe the red indicator on the electronic control circuit board (15).

6. Disconnect the brewer from the power source.

If the indicator was on or blinking, the temperature sensor is operating properly, proceed to #7. If the indicator was off, check the sensor connection on the electronic control circuit board and/or replace

9. Replace the electronic control assembly (1) and temperature sensor (8).

NOTE - each electronic control assembly is calibrated to a temperature sensor. Both components MUST be replaced as a set.

10. Check the voltage across the tank heater terminals (5) with a voltmeter. Connect the brewer to the power source. The indication must be:

a.) 208 volts ac for three wire 120/208 volt mod-

els and 240 volt ac for three wire 120/240 volt models while the red indicator on the circuit board is on or blinking.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models while the red indicator on the circuit board is on or blinking.

11. Disconnect the brewer from the power source.

If voltage was present as described, return the new triac assembly (17) to Bunn-O-Matic for credit. The temperature control of the system is operating properly. If voltage was not present as described, reinstall your existing electronic control assembly (1) and temperature sensor (8), and proceed to #12.

12. Replace the triac assembly (17).

Page 23

27124 050800

SERVICE (cont.)

O

N

CAUTION

!

Failure To Comply Voids Warranty!

Hot W

ater System

s –

W

ater Tank W

ill Fill

Automatically W

hen Unit Is Connected To Power!

Coffee Brewers –

Fill The Water Tank In

Accordance W

ith The Installation Instructions!

D

O NO

T

Turn O

n The Tank H

eater Sw

itch

Until W

ater C

om

es From

O

pened Faucet!

HAZARDOUS

VOLTAGE

DISCONNECT FROM

POWER SOURCE

BEFORE REMOVING!

W

A

R

N

IN

G

#7 BLU from Triac Assy #6 WHI/BRN to Tank Heater Switch

#5 PNK to Liquid Level Probe #4 RED to Terminal Block (Red Insert))

#2 GRN to Ground #1 WHI/BLU to Solenoid

TAN from Triac Assy to Tank Heater Switch

#3 BLK to RED Lead from Liquid Level Switch

O

FF

N

O

N

CAUTION

!

Failure To Comply Voids Warranty!

Hot W

ater System

s –

Water Tank W

ill Fill

Automatically W

hen Unit Is C

onnected To Power!

Coffee Brew

ers –

Fill The W

ater Tank In

Accordance W

ith The Installation Instructions!

DO

N

O

T

Turn O

n The Tan

k Heater Switch

U

ntil W

ater Com

es From

O

pened Faucet!

HAZARDOUS

VOLTAGE

DISCONNECT FROM

POWER SOURCE

BEFORE REMOVING!

W

A

R

N

IN

G

S

T

O

P

READ NOTICE

WHI & WHI to Temperature Sensor

PNK (Top) & GRY (Bottom) to Interlock Assy

GRY & GRY to InterLock Assy

PNK (Top) & GRY (Bottom) from LED

O

P

1

P

2

P

3

P

4

OFF

ON

STOP

READ NOTICE

ELECTRONIC CONTROL ASSEMBLY (cont.)

13. Check the voltage across the tank heater terminals (5) with a voltmeter. Connect the brewer to the power source. The indication must be:

a.) 208 volts ac for three wire 120/208 volt mod-

els and 240 volts ac for three wire 120/240 volt models while the red indicator on the circuit board is on or blinking.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models while the red indicator on the circuit is on or blinking.

14. Disconnect the brewer from the power source.

If voltage was present as described, the temperature control of the system is operating properly. Return the new electronic control assembly (1) and temperature sensor (8) to Bunn-O-Matic for credit.

Electronic Controls Removal and Replacement

NOTE - each electronic control assembly is calibrated to a temperature sensor. Both components MUST be replaced as a set.

1. Remove all wires from the electronic control assembly terminals.

2. Remove the two 8-32 screws holding the electronic control assembly to the component bracket.

3. Disconnect the temperature sensor and ready indicator wires from the left side of the electronic control assembly board.

4. Remove the temperature sensor from the grommet in the tank lid.

5. Install the new temperature sensor into the grommet on the tank lid. Route the wires to the location of the new electronic control assembly.

6. Attach the temperature sensor and ready indicator wires to the electronic control assembly.

7. Fasten the new electronic control assembly to its bracket.

8. Reconnect the wires.

9. Refer to the following illustration when reconnecting the wires.

10. Review the initial set-up procedures and adjust the control as required for the desired temperature.

Triac Assembly Removal and Replacement

NOTE - each triac installation requires the use of an approved silicone heat sink compound. Bunn-O-

Page 24

P784

Matic recommends the use of Dow Corning 340 compound or equivalent. It can be purchased direct from Bunn-O-Matic (part number M2522.0002).

1. Place the tank heater switch on the electronic control assembly in the “OFF” position.

2. Completely drain the tank.

3. Place a stryofoam or wood block between the center of the tank and the rear of the brewer.

4. Disconnect triac wires, white/violet from terminal block, blue from right tank heater, blue from electronic control and tan from tank heater switch.

5. Carefully set the brewer on its back.

6. Remove the two 2" dia hole plugs from the bottom cover.

7. Remove the four #10-32 keps nut securing tank to tank mounting bracket.

8. Remove the twelve #8-32 slotted head screws securing the bottom cover.

9. Remove the bottom cover with the four feet, the tank mounting brackets, triac/heat sink as an assembly.

27124 050800

PNK to PNK Lead from Right Brew Selector Switch

PNK to PNK Lead from Interface Socket

PNK to PNK Lead from Left Brew Selector Switch

SERVICE (cont.) ELECTRONIC CONTROL ASSEMBLY (cont.)

10. Remove triac/heat sink from right tank mounting bracket and discard.

11. Install new triac/heat sink assembly on right tank mounting bracket.

12. Route the wires up around the rear of the brewer.

13. Reinstall the bottom cover, four feet, tank mounting brackets and triac/heat sink to the bottom of the tank using four #10-32 keps nuts.

14. Secure bottom cover to brewer base with twelve #8-32 slotted head screws.

15. Stand the brewer upright.

16. Reconnect the wires of the new triac assembly. Refer to the illustration below when reconnecting wires.

WHI/VIO to Terminal Block (200V-240V Red Insert)

Test Procedure:

1. Disconnect the brewer from the power source.

2. Remove all wires from the switch terminals.

3. Place the selector switch in the left position. 4 Check for continuity across the center and right

terminals on the rear of the switch.

5. Continuity must not be present across the center and left terminals on the rear of the switch.

6. Check the bottom row, then the top row of terminals.

If continuity is present as described proceed to #7. If Continuity is not present as described replace the switch.

7. Place the selector switch in the right position.

8. Check for continuity across the center and left terminals on the rear of the switch.

9. Continuity must not be present across the center and right terminals on the rear of the switch.

10. Check the bottom row, then the top row.

BLU to Right Tank Heater (Left)

BLU to Electronic Control #7

TAN to Tank Heater Switch

GRINDER SELECTOR SWITCH

N IO T

A R O

P R O C

. C I A .

T A

.S

-M , U

S

-O I

N

O

N

IN

U

L

B

L

I Y ,

S B D

T L

T

D

E

A

I

N

E

/

Z F

W

R

T

S G U

R

N

T

I

E

:

C

R

H

S

A

P

T F S

N

U

E

N

T

A

P

A

M

P

M

BUNN

A

G E R IN I W

W

O L

L O

F . C

E

.

H

A

L

T

E

S

F

D

T

O

L

O

E

G

O

M

R

E

N

V

I

O

S

D A

M

N

H

R

E

P

O

E

B

N

Y

O

A

R

E

M

D

S

N

T

U

N

S

E

D

T

E

A

R

E

P

V

R

E

O

H

C

T

U

O

E R

D

O

M R O

CE

E

N

O

PR

.

G TIN A

R

erver size if

E

P

O

heck S

± 5°

rew

°F

1.C Brewer refuses to brew

onald's B

cD

perature: 200

2.M Tem (3-18-96)

R E T

N

N A C

IO

E

T

D D

U

R A

A

C

S I

D

!

: F I

D E K

D

C

E

A

H

R

Y

C

T

.

P

Y

A

M

R

E

D

C

E

S

N

D

M

.

E

A

H

L I

L

C

W

F

I

O

R

D

B

H

T

.

E

G I

T

C

H

E

A

L

E

N

Y

E

H

O

R

.

D

U

E

N

J

S

O I

O

N

T

I

S

U

P

A

.

T

X

R

S

E

O

N

S

K

P

E

T

R

S I

O

T

N

O

C

.

E

R

N

C I

M

O

T

Y

E

A

C

L

M

-

E

P

L

T

O

-

M

E

N

O

N

O

H

U B

N

C

E

5 8

U

9

R

O

F

1

T

A

E R

U L I A

F

8 5

6 : N P

N

O

I

!

T

C

A

U

T

H

O

D

I

L

I

U

Q

If continuity is present as described, reconnect the wires, the switch is operating properly.

P785

If continuity is not present as described, replace the switch.

11. Refer to the illustration below when reconnecting the wires.

R E T

A

W T O

H

N O I T U

A C

!

N

O

I

!

T

C

A

U

T

H

O

D

I

L

I

U

Q

P977

P787

Location:

The grinder selector switch is located in the

upper center on the front of the hood.

Page 25

SERVICE (cont.)

1.

5

.5

2.5

MINUTES

P/N 24486-0000 120 VAC

BUNN-O-MATIC

1.5

.5

2.5

MINUTES

P/N 24486-0000 120 VAC

BUNN-O-MATIC

LEVEL CONTROL BOARD AND LEVEL PROBE (Electro/mechanical only)

al

g

⁄2 1

1 l a g

⁄2 1

Y D A

E R

R

O T C

E

L E S

R E M

R A

/ W N O

T R A

T

5

6

C

4

I T A

7

M

-

O

-

3

N

4

N U

8

B

5

3

2

S

1

6

2

E T

l a

U

g

5

.5

2.

1

N I

3

M

.5

S

E T U

-

N

6

I

/

8

M

4

P

4

5

2

6

N

C

/

4

I

P

T

A

7

M

-

O

-

3

N

4

N

U

8

B

5

3

2

S

1

6

2

E

S

T

.

E

C I

U

T

5

T

.

C

N

U

2

I

A

1.5

A

N

M

I

M

V

-

M

0

O

2

- 1

1

N

S

-

U

0

E

2

B

1

T

6

U

2

C

N

I

3

N

A

/

M

V

P

0 2 1

.5

S

0

E

0

T

0

U

0

-

N

6

I

8

M

4 4

2

N

/

P

2

⁄

N

1

I

1

M

al g 1

l

S

a g

E

S

⁄2 1

T

.

E

C I

U

T

C

U

A

N I

M

V

-

M

0

O

2

-

2

1

N

-

0

U

0

2

B

0

6

0

2

N

R

A W /

N O

R

O T C

E

L E S

Y D A

E R

S

T

R A T S

R E M

6. Carefully connect a piece of insulated jumper wire to terminal 4. Keep the other end of this wire away from any metal surface of the brewer.

7. Check the voltage across terminals 1 & 3 with a voltmeter. Connect the brewer to the power source. The indication must be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models after a delay of approximately 1 second.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models after a delay of approximately 1 second.

8. Touch the free end of jumper wire to the brewer housing. The indication must be 0.

9. Move the jumper wire away from the brewer housing. The indication must again be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models after a delay of approximately 1 second.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models after a delay of approximately 1 second.

10. Disconnect the brewer from the power source and remove the jumper wire from terminal 4.

P978

Location:

The level control board is located inside the front of the brewer just left of center on the component bracket

Test Procedure:

1. Disconnect the brewer from the power source.

2. Remove the violet wire from terminal 1 & pink wire

from terminal 4 of the circuit board.

3. Check the voltage across terminals 2 & 3 with a

voltmeter. Connect the brewer to the power source. The indication must be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

4. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the wiring diagrams and check the brewer wiring harness.

5. Reconnect the violet wire to terminal 1.

If voltage is present as described, the level control board is operating properly, proceed to #11. If voltage is not present as described, replace the level control board.

11. Reconnect the pink wire to terminal 4.

12. Gently pull the probe out of the tank lid and inspect for corrosion. Replace it if necessary.

13. Place the probe so that neither end is in contact with any metal surface of the brewer.

14. Check the voltage across terminals 1 & 3 with a voltmeter. Connect the brewer to the power source. The indication must be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models after a delay of approximately 1 second.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models after a delay of approximately 1 second.

15. Move the probe's flat end to the brewer housing. The indication must be 0.

16. Move the probe's flat end away from the brewer housing. The indication should again be

a.) 120 volts ac for three wire 120/208 volt mod-

Page 26

SERVICE (cont.)

1.5

.5

2.5

MINUTES

P/N 24486-0000 120 VAC

BUNN-O-MATIC

LEVEL CONTROL BOARD AND LEVEL PROBE (Electro/mechanical only) (cont.)

els and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

17. Disconnect the brewer from the power source.

LIMIT THERMOSTAT

If voltage is present as described, reinstall the probe, the level control board and level probe are operating properly. If voltage is not present as described, check the pink probe wire for continuity.

Removal and Replacement:

1. Remove all wires from the level control board.

2. Remove two #8-32 slotted head screws holding level control board to component bracket.

3. Install the new level control board to the component bracket. Make certain that the lockwashers are between the level control board and the component bracket.

4. Refer to the illustration below when reconnecting the wires.

T4 PNK to Probe T3 WHI to Terminal Block (White Insert

on 120V Two Wire , 120/208V or 120/240V Three Wire Brewers) T3 RED to Terminal Block (Red Insert on 200V or 240V Brewers)

T2 BLU to Overflow Protection Switch

T1 VIO to Solenoid Coil

P789

S

.

E

C I

T

C

U

A

A N I

M

V

-

M

0

O

2

-

1 N N

-

U

0

2

B

6 2

N /

P

5

6

C

4

I

T

A

7

M

O

-

3

N

4

N U

8

B

5

3

2

S

1

6

2

E

S

T

.

E

C I

U

T

5

T

.

C

N

U

2

I

A

1.5

A

N

M

I

M

V

-

M

0

O

2

- 1

1

N

S

-

U

0

E

2

B

1

T

6

U

2

C

N I

3

N

A

/

M

V

P

0 2

1

.5

S

0

E

0

T

0

U

0

-

N

6

I

8

M

4 4 2

N /

P

P979

Location:

The limit thermostat is located inside the hood

on the tank lid just to the left of the right tank heater.

Test Procedure:

1. Disconnect the brewer from the power supply.

2. Disconnect the black wires from the limit thermostat.

3. Check continuity across the limit thermostat terminals with an ohm meter

If continuity is present as described, reconnect the black wires to the limit thermostat, the limit thermostat is operating properly. If continuity is not present as described, press the reset button on the limit thermostat and repeat step #3. After repeating step #3 no continuity is shown, replace the limit thermostat.

Removal and Replacement:

1. Remove all wires from the limit thermostat terminals.

2. Carefully remove the two #8-32 nuts securing the limit thermostat to tank lid and remove limit thermostat.

3. Carefully secure new limit thermostat to tank lid.

4. Refer to the illustrations below when reconnecting the wires.

Page 27

SERVICE (cont.)

ON/OFF SWITCH

N O I

N

T

A R O P R O

C

.

C I

A .

T

S

A

N

.

M

U

- ,

S

-O I

N

O

N

I

U

L

B

L I

Y

,

S

B

D

T

L

T

D

U

E

A

I

E

/N

Z

F

W

R

S

T

G

U

R

N

T

I

E

:

C

R

H

S

A

P

T

F

S

N

U

E

N

T

A

P

A

M

P

B

A

G

E

N

R

I I W

W

O L

L O F

.

E

.C

H

A

T

L E

S

F

D

T

O

L

O

E

G

O

M

R

E

V

IN

O

S

D

A

M

N

H

R

E

P

O

E

B

N O

Y A

R

E

M

D

S

N

T N

U

S

E

D

T

E

A

R

E

P

V

R

E

O

H

C

T

U

O E

R

D

O M

E

R O

C

E N

O

R

P

if

.

G

ize

rew

IN

b

T

er s

A

v

to

er

es

ER

S

us

P

k

ef

O

ec

r

5°

h

±

er

C

rew

w

.

B

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re

0°F

's

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ld

: 20

a

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on

tu

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ra

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pe

.

m

6)

2

e

-9

T

18

(3-

R E T

N

N A

C

IO

E

T

D D

U

R

A

C

S I

D

!

:

F I

D E

K

D

C

E

A

H

R

Y

C

T

C

T

.

P

Y

A

M

R

E

C

D

E

S

N

D

M

.

E

A

H L I

L

W

IC

O

F

R

D

H

B

T

.

E

G I

T

C

H

E

A

L

E

N

Y

E

H

O

R

.

D

U

E E

N

J

S

O I

O

N

T

I

S

U

P

A

.

T

X

R

S

E

O

N

S

K

P

E

T

R

S I

O

T

N

O

C

.

E

R

N

C I

M

O

T

Y

E

A

C

L

M

-

P

E

L

T

O

-

M

E

N

O

N

O

H

U B

N

C

E

5 8

U

9

R

O

F

1

T

A

E

R U L I

A

F

8 5 6

: N P

P980

Location:

The ON/OFF switches are located on the front of the hood just to the left and right of the start switches. Test Procedure:

1. Disconnect the brewer from the power source.

2. Viewing the switch from the back remove the white

or red wire from the upper right terminal and the black wire from the center terminal.

3. Check the voltage across the white wire and the

black wire or red and black wire with a voltmeter. Connect the brewer to the power source. The indication must be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

4. Disconnect the brewer from the power source.

left terminal with switch in the "ON" position. Continuity must not be present when switch is in the "OFF" position.

If continuity is present as described, reconnect the black wire to the center terminal and the white/red wire on the left switch or the white/violet on the right switch to the lower left terminal. If continuity is not present as described, replace the switch.

Removal and Installation:

1. Remove the wires from the switch terminals.

2. Compress the clips inside the hood and gently push the switch through the opening.

3. Push the new switch into the opening and spread the clips to hold switch in the hood.

4. Refer to the illustration below when reconnecting the wires.

WHI to Terminal

BLK to Terminal Block (Black

Insert) WHI/RED to Left Timer TL1

LEFT

BLK to Terminal Block (Black Insert) WHI/VIO to Right Timer TL1

RIGHT

Block (White Insert on 120/208V or 120/240V Models) RED to Terminal Block (Red Insert on 200V or 240V Models)

WHI to Terminal Block ( White Insert on 120/208V or 120/240V Models) RED to Terminal Block (Red Insert on 200V or 240V Models)

P793

If voltage is present as described, reconnect the white or the red wire, and proceed to #5. If voltage is not present as described, refer to the

Wiring Diagrams

and check the brewer wiring har-

ness.

5. With the black wire removed, remove the white/ red wire on the left switch or the white/violet wire on the right switch from the lower left terminal.

6. Check for continuity across the center and lower

Page 28

Page 29

SERVICE (cont.)

SERVER SENSOR (cont.)

OVERFLOW PROTECTION SWITCH

3. Check for continuity across the overflow protection switch red wires only until the plastic float is raised and check that continuity returns when the plastic float is again lowered.

If continuity is present as described, reconnect the red wires to the blue wire from the thermostat or black wire from electronic control assembly and the black wire from terminal block. If continuity is not present as described, replace the overflow protection switch.

Removal and Replacement:

1. Disconnect the red leads from the overflow protection switch from the blue wire from the thermostat or black wire from electronic control assembly and the black wire from the terminal block.

2. Remove the nut beneath the copper overflow cup.

3. Remove the entire switch assembly from the cup.

4. Place the new switch assembly into the cup, wires first. Make sure that the gasket is in place around the threaded switch stem.

NOTE - The magnets must be at the top of float and there must be NO adjusting washers installed for the overflow protection switch to operate properly.

5. Install the nut beneath the copper overflow cup. Be sure not to overtighten.

6. Refer to the illustration below when reconnecting wires.

Location:

The overflow protection switch is located inside the hood on the center of the tank inside the copper overflow cup.

To test the overflow protection switch, access will also be needed to the level control board or electronic control assembly and terminal block.

Test Procedure:

1. Disconnect the brewer from the power source.

2. Remove the wire nuts connecting the red wires

from the overflow protection switch to the black wire from the terminal block and blue wire from the thermostat or the black wire from the electronic control assembly.

Page 30

RED to BLK Wire from Terminal Block

RED to BLU Lead from Thermostat

P795

SERVICE (cont.)

1.5

.5

2.5

MINUTES

P/N 24486-0000 120 VAC

BUNN-O-MATIC

1.5

.5

2.5

MINUTES

P/N 24486-0000 120 VAC

BUNN-O-MATIC

RELAY (Brewers W/Recovery Booster)

NOTE -Electro/ mechanically controlled brewers have

two relays and the electronic controlled have one relay.

l a

g

⁄2 1

1 l ga

1 al g

⁄2 1

Y

D A E

R

O T C

E

L E S

R E M

R

A / W N

O

T R

5

6

C

4

I T A

7

M

-

O

-

3

N

4

N U

8

B

5

3

2

S

1

6

2

E T

U

.5

N

2

I

1.5

1

3

.5

S E T

U

5

N

6

I

M

C

4

I

4

T

2

P

A

7

M

N

/

P

O

-

3

N

4

N

U

8

B

5

3

2

S

1

6

2

E T U

.5

N

.5

2

I

1

M

S

.

E

C

I

1

T

C

U

A

S

A

N

E

I

M

V

-

1

T

M

0

O

U

2

-

C

N

1

N

I

3

A

N

M

-

V

U

0

2

B

2

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source . The indication must be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

4. Disconnect brewer from the power source.

If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the wiring diagrams and check the brewer wiring harness.

5. Remove the white/green wire from the "A" terminal and white/violet wire from the "B" terminal on the right relay, the white/brown from the "A" terminal and white/red wire from "B" terminal on the left relay.

6. Check for continuity across the "A" and "B" terminals of each relay.

If continuity is present as described, reconnect the white /green wire and white violet wire to the right relay or the white/brown and the white /red wire to the left relay and proceed to #7. If continuity is not present as described, replace the relay(s).

Location: Electro/mechanical Controlled Brewers

The relays are located inside the hood, the right relay just to the right of the contactor in front of the tank and left relay is just left of the component bracket in front of the tank. Electronic Controlled Brewers

The relay is located inside the hood just to the right of the contactor in front of the tank.

Test Procedures: Electro/mechanically Controlled Brewers.

1. Disconnect the brewer from the power source.

2. Locate the black wire on the left relay center

terminal and the blue wire on the right relay center terminal.

3. Check the voltage across the black and blue wire

with a voltmeter. Connect the brewer to the power

P982

7. Remove the two blue wires from terminal 5 and the red wire from terminal 7 on the right relay, the black wires from terminal 5 and the red wire from terminal 7 on the left relay.

8. Check for continuity across terminals 5 and 7 of each relay by manually closing relay contact. Continuity must not be present when contact is released.

If continuity is present as described, reconnect blue wires to terminal 5 on the right relay, the black wires to terminal 5 on the left relay and the red wire to left and right terminal 7, the relays are operating properly. If continuity is not present as described, replace the relay(s).

Electronically Controlled Brewers NOTE: Brewer must be at operating temperature to perform test procedures or brew-lock must be bypassed. To bypass brew-lock disconnect white/ orange and brown/black for right timer or orange and red/black for left timer from brew-lock of ECA and connect the harness leads together.

Page 31

SERVICE (cont.) Relay (Brewers W/Recovery Booster) (cont.)

1. Disconnect brewer from the power source and place both selector switches in the 1/2 gallon position.

2. Locate the gray wire on terminal 7 and the white/ green wire on terminal B of the relay.

3. Check the voltage across the gray and white/green wire with left and right "ON/OFF" switch in the "ON" position. Connect the brewer to the power source and press the left and right start switch. The indication must be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

4. Disconnect brewer from the power source.

If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the wiring diagrams and the check brewer wiring harness.

LEFT

7

5. Locate the white/red wire on the relay terminal 5 and the gray wire relay terminal 7.

6. Check for continuity across the relay terminals 5 and 7 by manually closing relay contact. Continuity must not be present when contact is released.

If continuity is present as described, reconnect the brew-lock if necessary, the relay is operating properly. If continuity is not present as described, replace the relay.

Removal and Replacement:

1. Remove all wires from relay terminals.

2. Remove the #8-32 slotted screw holding relay mounting bracket to the hood.

3. Remove the relay from the mounting bracket.

4. Securely install the new relay to the mounting bracket.

5. Install the relay mounting to the hood.

6. Refer to the illustration below when reconnecting the wires.

RED

RIGHT

7

B

A

WHI/BRN to Left Dispense Valve

MECHANICAL THERMOSTAT W/RECOVERY BOOSTER

GRY to BLK Lead from Contactor Coil

WHI/VIO to Right Dispense Valve

BLK to BLK Lead on Contactor Coil

5

BLK to BLK Lead on Thermostat

WHI/RED to Left Dispense Valve

7

WHI/RED to Left Dispense Valve

WHI/GRN to Right Dispense Valve

BLU to BLU Lead from Thermostat BLU to BLU Lead from Liquid Level Board

A

WHI/VIO to Right Dispense Valve

WHI/GRN to Right

B

Dispense Valve

5

A

5

B

ELECTRONIC CONTROL W/RECOVERY BOOSTER

Page 32

P797

27124 050800

SERVICE (cont.)

1.5

.5

2.5

MINUTES

P/N 24486-0000 120 VAC

BUNN-O

-MATIC

1.5

.5

2.5

MINUTES

P/N 24486-0000 120 VAC

BUNN-O-MATIC

SOLENOID VALVE (Inlet)

If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the wiring diagrams and check brewer wiring harness.

5. Check for continuity across the solenoid valve coil

terminals.

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Location:

The solenoid valve is located inside the lower

right front of the brewer.

Test Procedure:

1. Disconnect the brewer from the power source and draw 1/4 gallon of water from faucet.

2. Remove both wires from the solenoid valve coil terminals.

3. Check the voltage across the removed wires: a.) Violet and white on 120/208 volt and 120/240

volt three wire electro/mechanical models.

b.) Violet and red on 200 volt and 240 volt electro/

mechanical models.

c.) White/Blue and White on 120/208 volt and

120/240 volt electronic models.

d.) White/Blue and Red on 200 volt and 240 volt

electronic models. with a voltmeter. Connect the brewer to the power source. The indication must be: a.) 120 volts ac for 120/208V and 120/240V three

wire models. b.) 200 to 240 volts ac for 200V or 240V two wire

models.

4. Disconnect the brewer from the power source.

If continuity is present as described, reconnect the white and violet wires on the electro/mechanical controlled 120/208 and 120/240 volt brewers, white and white/blue on electronic controlled 120/208 and 120/ 240 volt brewers, red and violet on electro/mechanical controlled 200 or 240 volt brewers and red and white/ blue on electronic controlled 200 or 240 volt brewers. If continuity is not present as described, replace the solenoid valve.

6. Check the solenoid valve for coil action. Connect the brewer to the power source. Listen carefully in the vicinity of the solenoid valve for a "clicking" sound after approximately 1 second, as the coil magnet attracts.

7. Disconnect the brewer from the power source.

P983

If the sound is heard as described and water will not pass through the solenoid valve, there may be a blockage in the water line before or after the solenoid valve or, the solenoid valve may require inspection for wear, and removal of waterborne particles. If the sound is not heard as described, replace the solenoid valve.

Removal and Replacement:

1. Remove all wires from the solenoid valve coil.

2. Turn-off the water supply to the brewer.

3. Disconnect the water lines to and from the solenoid valve.

4. Remove the two #8-32 slotted head screws holding the solenoid valve and mounting bracket to the brewer trunk.

5. Lift-out the solenoid valve.

6. Remove the two #10-32 slotted head screws holding the solenoid valve to the mounting bracket.

7. Securely install the new solenoid valve to its mounting bracket.

8. Attach the solenoid valve and mounting bracket to the brewer trunk.

9. Securely fasten the water lines to and from the

(Continued)

Page 33

SERVICE (cont.) SOLENOID VALVE (Inlet) (cont.)

solenoid valve.

10. Refer to the illustration below when reconnecting the wires.

WHI to Level Control Board T3 (120/208V or 120/240V Electro/mechanical) WHI to Terminal Block (120/208V or 120/240V Electronic) Red to Level Control Board T3 (200 or 240V Electro/mechanical or Control Assy T4 Electronic)

VIO to Level Control Board T1 (Electro/mechanical) WHI/BLU to Control Assy #1 (Electronic)

If continuity is present as described, reconnect the wires, the switch is operating properly. If continuity is not present as described, replace the switch.

Removal and Replacement:

1. Remove all wires from the switch terminals.

2. Compress the clips inside the hood and gently push the switch through the opening.

3. Push the new switch into the opening and spread the clips to hold the switch in the hood.

4. Refer to the following illustration when reconnecting the wires.

GRN to Left Relay Terminal "A"

START SWITCHES

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Location:

The momentary start switches are located in

front of hood just left and right of center.

P799

P984

LEFT

RIGHT

WHI/RED to Left ON/OFF Switch to Left Timer TL1

GRN to Right Relay Terminal "A"

WHI/VIO to Right ON/OFF Switch and Right Timer TL1

P992

Test Procedure:

1. Disconnect the brewer from the power source and remove the wires from both terminals of the switch.

2. Check for continuity across the two terminals on the switch when it is held in the lower position. Continuity must not be present across these terminals in the upper position.

Page 34

27124 050800

SERVICE (cont.)

TANK HEATERS

P985

Location:

The tank heaters are located on the left and

right side of the tank lid.

Test Procedure:

Electro/Mechanical Models.

1. Disconnect the brewer from the power supply. 2 Check the voltage across the black and the red

wires on three wire 120/208V, 120/240V or two wire 200V, 240V models on the tank heaters. With the control thermostat turned to the "ON" position (fully clockwise), connect the brewer to the power supply and check the voltage across the wires with a voltmeter. The indication should be:

a.) 208 volts ac for three wire 120/208 volt mod-

els and 240 volts ac for three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

3. Disconnect the brewer from the power supply.

wires, the tank heaters are operating properly. If continuity is not present as described, replace the tank heater(s). NOTE - If the tank heater remains unable to heat, remove and inspect the heater for cracks in the sheath.

Electronic Control Models:

1. Disconnect the brewer from the power source.

2. Disconnect wires from heater(s).

3. Check for continuity across the tank heater terminals.

If continuity is present as described, the tank heater is operating properly. If continuity is not present as described, replace the tank heater. NOTE - If the tank heater remains unable to heat, remove and inspect the heaters for cracks in the sheath.

Removal and Replacement:

1. Remove wires from tank heater.

2. Remove the four #8-32 nuts securing tank heater to tank lid.

3. Remove tank heater and gasket.

4. Install new tank heater and gasket with four #8-32 nuts on tank lid.

5. Refer to the illustration below when reconnecting the wires.

If voltage is present as described, proceed to #4. If voltage is not present as described, refer to the wiring diagrams and check the wiring harness.

4. Remove the black and red wires from the tank heaters.

5. Check for continuity across the terminals of the tank heaters.

If continuity is present as described, reconnect the

P803

Page 35

SERVICE (cont.)

TIMERS (Early Models)

S

.

E

C I

T

C

U

A

A N I

M

V

-

M

0

O

2

-

1

N

-

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0 2

B

6

2 N /

P

P986

Location:

The timers are located inside the left front of

the brewer on the upper part of the component bracket.

pink wire to TL3, white/brown to TL4, yellow to TL5 and proceed to #5. If voltage is not present as described, refer to the wiring diagrams and check the brewer wiring harness.

NOTE: ECA MODELS ONLY - Brewer must be at operating temperature to perform step 5 or brew-lock must be bypassed. To bypass brew-lock disconnect white/orange and brown/black for right timer or orange and red/black for left timer from brew-lock of ECA and connect the harness leads together.

5. Place 1/2 gallon server under the funnel and select 1/2 gallon position on the selector switch.

6. Check the voltage across terminals TL1 and TL4 with a voltmeter when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source and press the start switch. The indication must be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/208 volt models for approximately 20 seconds for 1/2 gallon batch.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models for approximately 20 seconds for 1/2 gallon batch.

7. Place a 1-3/4 gallon server under the funnel. Select a 1 gallon batch and repeat #6. The voltage indication should remain for approximately 40 seconds.

8. Select a 1-3/4 gallon batch and repeat #6. The indication should remain approximately 1 minute.

9. Reconnect brew-lock wires if necessary.

Test Procedures:

1. Disconnect the brewer from the power source.

2. Disconnect the wires from the timer terminals TL3, TL4 and TL5 and rotate the dial(s) fully counterclockwise.

3. Check the voltage across terminals TL1 and TL2 with a voltmeter when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source. The indication must be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

4. Disconnect the brewer from the power source.

If voltage is present as described for the right timer reconnect the pink wire to TL3, white/green to TL4 and white/yellow to TL5. For the left timer reconnect the

Removal and Replacement:

1. Remove all wires from the timer.

2. Remove the four #6-32 slotted head screws holding circuit board and dial plate on to the component mounting bracket.

3. Remove circuit board, nylon spacers and dial plate.

4. Install new dial plate and circuit board with nylon spacers to component mounting bracket.

5. Refer to the illustration on the following pages when reconnecting wires.

6. Adjust timer dials as required.

Page 36

SERVICE (cont.)

2

1.5

1

.5

2.5

MINUTES

P/N 24486-0000 120 VAC

BUNN-O-MATIC

3

4

5

6

7

8

1.5

.5

2.5

MINUTES

P/N 24486-0000 120 VAC

BUNN-O-MATIC

Timers (Early Models)(cont.)

5

6

4

7

3

4

8

BUNN-O-MATIC

5

3

2

1

6

2

.5

2

1

.5

1.5

MINUTES

1

3

MINUTES

P/N 24486-0000 120 VAC

MINUTES

BUNN-O-MATIC

2

.5

2

1.5

1

3

.5

MINUTES

P/N 24486-0000 120 VAC

2

1

MINUTES

5

6

4

7

3

4

8

5

3

2

1

6

MINUTES

WHI/RED TL1 to Left ON/OFF Switch WHI/RED TL1 to Left Start Switch

WHI TL2 To Terminal Block and Left Soft Heat Relay "B" (White Insert on120/208V and 120/240V Three Pole Terminal Blocks) RED TL2 to Terminal Block (Red Insert on 200V or 240V Two Pole Terminal Blocks.

ORA TL3 to Left Start Switch Terminal WHI/BRN TL4 to Left Dispense Valve YEL TL5 to Left Start Switch Terminal

LEFT

WHI/VIO TL1 to Right ON/OFF Switch WHI/VIO TL1 to Right Start Switch

WHI TL2 To Terminal Block and Right Soft Heat Relay "B" (White Insert on 120/208V and 120/240V Three Pole Terminal Blocks) RED TL2 to Terminal Block (Red Insert on 200V or 240V Two Pole Terminal Blocks.

WHI/ORA TL3 to Right Start Switch Terminal WHI/GRN TL4 to Right Dispense Valve WHI/YEL TL5 to Right Start Switch Terminal

RIGHT

P1070

Page 37

27124 050800

SERVICE (cont.) TIMERS (Late Models)

P2194

Location:

The timers are located inside the left front of the

brewer on the upper part of the component bracket.

Test Procedures: NOTE: Do not remove or install wires while timer board is installed. Pressure applied to one side may cause damage to the board.

1. Disconnect the brewer from the power source and remove the front panel.

2. Check the voltage across terminals TL1 and TL2 with a voltmeter when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source. The indication must be:

a.) 120 volts ac for two wire 120 volt models,

three wire 120/208 volt models and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

3. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #4. If voltage is not present as described, refer to the wiring diagrams and check the brewer wiring harness.

4. Disconnect the PNK wire from terminal TL3 and the YEL or WHI/YEL wire from terminal TL5. Check for continuity across the two wires when the start switch is pressed to the "START" position.

Page 38

If continuity is present as described, reconnect the wires and proceed to #5. If continuity is not present as described, refer to the wiring diagrams and check the brewer wiring harness.

5. Check the voltage across terminals TL1 and TL4 with a voltmeter when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source. The indication must be zero volts.

If voltage indications are other than described, disconnect the brewer from the power source and replace the timer.

6. Check the voltage across terminals TL1 and TL4 with a voltmeter when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source and press the start switch. The indication must be:

a.) 120 volts ac for two wire 120 volt models,

three wire 120/208 volt models and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

If voltage indications are other than described, disconnect the brewer from the power source and replace the timer.

7. Remove the test equipment and connect all wires as described below.

Removal and Replacement: NOTE: Do not remove or install wires while timer board is installed. Pressure applied to one side may cause damage to the board.

1. Remove the six #6-32 screws securing circuit

board to component mounting bracket.

2. Remove circuit board and nylon spacers.

3. Remove all wires from the timer.

4. Attach all wires to the replacement timer board

prior to installation to the component mounting bracket. Refer to FIG. below when reconnecting the wires.

5. Install new circuit board with nylon spacers to

component mounting bracket using four #6-32 screws.

6. Adjust the timer as described below.

27124 062100

SERVICE (cont.)

TIMERS (Late Models)(cont.)

Timer Setting: NOTE: Check that the brewer is connected to water supply, the tank is properly filled, and a funnel and server are in place, prior to setting or modifying volumes. NOTE: All volume settings must be done with the sprayhead installed.

1. Modifying brew volumes. To modify a brew vol-

ume, first check that the SET/LOCK switch is in the "SET" position on the circuit board. To increase a brew volume, place the ON/OFF switch in the "ON" position, press and hold the START 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. To decrease a brew volume, place the ON/OFF switch in the "ON" position, press and release the START switch once for every two-second interval to be removed from the total brew time period; then immediately press and hold down the START 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 brew volumes. To set a brew volume, first

check that the SET/LOCK switch is in the "SET" position on the circuit board. Place the ON/OFF switch in the "ON" position, press and hold the START 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).

TL3

TL2

TL1

LOCK

LEFT TIMER RIGHT TIMER

YEL WHI/YEL wire to TL5 WHI/BRN WHI/GRN wire to TL4 PNK PNK wire to TL3 WHI WHI wire to TL2 (120V Two Pole,

RED RED wire to TL2 (200V or 240V

WHI/RED WHI/VOI wire to TL1

J2

SET

SET LOCK

120/208V or 120/240V Three Pole Terminal Block)

Two Pole Terminal Block)

TL4

TL5

J1

P2037

View the level of the liquid being dispensed. When the desired level is reached, turn the ON/OFF switch to "OFF". NOTE: Several ounces of water will continue to syphon from the tank after turning the switch "OFF". 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, volumes will decrease due to absorption by the coffee grounds.

3. Setting programming disable feature. If it be-

comes necessary to prevent anyone from changing brew time once programmed, you can set the SET/LOCK switch to the "LOCK" position. This will prevent any further programming.

Page 39

27124 062100

L1

BLK-12

LIMIT THERMOSTAT

DUAL-TF BREWER W/SERVER SENSOR

& TWO-GRINDER INTERFACE

BLK-12

N.O.

BLK-12 BLK-12

TANK HEATERS (TWO)K1

READY INDICATORS

RED-12 RED-12

K1

N.O.

GRN

RED-12

N

L2

BLK

R T

S E L E C T O R

S W

OVERFLOW

PROTECTION SW

RED RED

TAN GRY

FRACTIONAL BATCHES

(CONNECT

AS REQUIRED)

FULL BATCH

(NO CONNECTION)

WHI/VIO WHI/RED

YEL ORA

WHI/ORA

GRY

PNK

TAN

PNK

4 3

INTERFACE

2

CONNECTOR

1

1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH

3/4 BATCH BATCH COMMON

GRINDER

SW. & THERMOSTAT

OPTIONAL

RECOVERY BOOSTER

RIGHT

RIGHT BREW TIMER

RED

SW.

1 2 3 4 5

BYPASS

SOL

WHI

WHI/VIO WHI/VIO

WHI

PNK

WHI/GRN

WHI/YEL

WHI/GRN

K2 N.O. K3 N.O.

BLK

YEL ORA

WHI/ORA

BLKBLU

BOARD

LIQUID LEVEL

K1

REFILL

VIO

1

BLU

2

3

PIN-20

4

SOL

PROBE

WHI

WHI WHI

WHI

START SW.

WHI/VIO

WHI/GRN

GRY

1

WHIWHI

2 3 4 5 6

DISPENSE

WHI/GRN

RECOVERY BOOSTER

SOL

OPTIONAL

K2

TAN GRN ORA

YEL PNK BLU

SERVER SENSOR

WHI/VIO

4

PNK

3

INTERFACE

2

CONNECTOR

1

GRINDER

1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH

3/4 BATCH BATCH COMMON

BLK

LEFT BREW TIMER

YEL ORA

WHI/ORA

GRY

PNK

TAN

TAN GRY

FRACTIONAL BATCHES

(CONNECT

L T

S E L E C T O R

S W

AS REQUIRED)

FULL BATCH

(NO CONNECTION)

WHI/VIO WHI/RED

YEL ORA

WHI/ORA

LEFT SW.

WHI

WHI/RED

1

WHI

2

PNK

3

WHI/BRN

4

YEL

5

BYPASS

WHI/GRN

SOL

120/208 VOLTS AC OR

120/240 VOLTS AC

3 WIRE

Page 40

START SW.

WHI/RED

WHI/BRN WHI/RED

GRY WHIWHI

WHI/BRN WHI/RED

OPTIONAL

RECOVERY BOOSTER

1 2 3 4 5 6

DISPENSE

K3

SOL

TAN GRN ORA

YEL PNK BLU

SERVER SENSOR

WHI

27124 050800

L1

BLK-12

DUAL-ATF OR BTF BREWER W/SERVER SENSOR

LIMIT THERMOSTAT

BLK-12

& TWO-GRINDER INTERFACE

N.O.

BLK-12 BLK-12

TANK HEATERS (TWO)K1

READY INDICATORS

RED-12 RED-12

N.O.

GRN/YEL

L2

RED-12

K1

BLK

R T

S E L E C T O R

S W

OVERFLOW

PROTECTION SW

RED RED

TAN

GRY

FRACTIONAL BATCHES

(CONNECT

AS REQUIRED)

FULL BATCH

(NO CONNECTION)

WHI/VIO WHI/RED

YEL ORA

WHI/ORA

GRY

PNK

TAN

PNK

4 3

INTERFACE

2

CONNECTOR

1

1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH

3/4 BATCH BATCH COMMON

GRINDER

SW. & THERMOSTAT

OPTIONAL

RECOVERY BOOSTER

RIGHT

RIGHT BREW TIMER

RED

SW.

WHI/VIO WHI/VIO GRYWHI/VIO

1 2

PNK

3

WHI/GRN

4

WHI/YEL

5

BYPASS

SOL

K2 N.O. K3 N.O.

BLK

YEL ORA

WHI/ORA

BLKBLU

RED

WHI/GRN

BLKBLU

START SW.

LIQUID LEVEL

BOARD

WHI/GRN

K1

VIO

1

BLU

2

3

PIN-20

4

1

REDREDRED

2 3 4 5 6

DISPENSE

WHI/GRN

RECOVERY BOOSTER

SOL

OPTIONAL

K2

REFILL

SOL

PROBE

TAN GRN ORA

YEL PNK BLU

RED

RED RED

RED

SERVER SENSOR

WHI/VIO

BLK

LEFT BREW TIMER

YEL ORA

WHI/ORA

LEFT SW.

4

GRY PNK TAN

3

INTERFACE

2

CONNECTOR

1

GRINDER

TAN

GRY

FRACTIONAL BATCHES

(CONNECT

L T

S E L E C T O R

S W

AS REQUIRED)

FULL BATCH

(NO CONNECTION)

WHI/VIO WHI/RED

YEL ORA

WHI/ORA

PNK

1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH

3/4 BATCH BATCH COMMON

RED

WHI/RED WHI/RED GRYWHI/RED

1 2

PNK

3

WHI/BRN

4

YEL

5

BYPASS

WHI/GRN

SOL

200 OR 240 VOLTS AC

2 WIRE

Page 41

START SW.

TAN

1

REDREDRED

WHI/BRN WHI/RED

OPTIONAL

RECOVERY BOOSTER

WHI/BRN WHI/RED

2 3 4 5 6

DISPENSE

K3

SOL

GRN ORA

YEL PNK BLU

SERVER SENSOR

RED

27124 050800

DUAL -TF BREWER ECA W/SERVER SENSOR

L1

BLK-12

BLK

R T

S E L E C T O R

S

W

LIMIT

THERMOSTAT

PROTECTION SW

RED RED

FRACTIONAL BATCHES

(CONNECT

AS REQUIRED)

FULL BATCH

(NO CONNECTION)

WHI/VIO WHI/RED

WHI/ORA

GRY PNK TAN

BLK-12

READY

L.E.D.

OVERFLOW

TAN

GRY

YEL ORA

GRY PNK TAN

PNK

& TWO-GRINDER INTERFACE

GRN

t°

PNK

GRY GRY GRY

BRN/BLK

RED/BLK

RIGHT SW.

RIGHT BREW TIMER

W

H

I

1 2

3 4 5

BYPASS

BLU-12 BLU-12BLK-12

ELECTRONIC

CONTROL ASSY

WHI/VIO WHI/VIO

WHI PNK

WHI/GRN

WHI/YEL

SOL

TANK HEATER

SW

WHI

WHI/GRN

TANK HEATERS (TWO)

PNK

GRY

1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH

3/4 BATCH BATCH COMMON

4

GRINDER

3

INTERFACE

2

CONNECTOR

1

W H

I

INTERLOCK

ASSY

WHI/ORA

BLK

WHI/ORA

ORA

YEL ORA

OPTIONAL RECOVERY BOOSTER

BLU-12 RED-12

K1 N.O.

BLU-12

TAN BLU

7

WHI/BRN

6

PIN 20

(PROBE)

5 4 3 2 1

BRN/BLK RED/BLK

START SW.

BLK

GRN

WHI/VIO

WHI/GRN

WHI/BLU

GRY WHIWHI

WHI/GRN

OPTIONAL

RECOVERY BOOSTER

REFILL

1 2 3 4 5 6

DISPENSE

K2

SOL

RED

TAN GRN ORA

YEL PNK BLU

WHI-12

SERVER SENSOR

WHI/VIO

L2

WHI

N

4

PNK

GRINDER

3

INTERFACE

2

CONNECTOR

1

1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH

3/4 BATCH BATCH COMMON

BLK

GRY

PNK

TAN

GRY

FRACTIONAL BATCHES

(CONNECT

L T

S E L E C T O R

S

W

AS REQUIRED)

FULL BATCH

(NO CONNECTION)

WHI/VIO WHI/RED

YEL ORA

WHI/ORA

LEFT SW.

WHI

WHI/RED

1 2

3 4 5

BYPASS

SOL

WHI PNK

WHI/BRN

YEL

WHI/GRN

YEL ORA ORA

LEFT BREW TIMER

120/208 VOLTS AC OR

120/240 VOLTS AC

3 WIRE

Page 42

WHI

START SW.

WHI/RED

WHI/BRN WHI/RED

GRY WHIWHI

WHI/BRN WHI/RED

OPTIONAL

RECOVERY BOOSTER

K1

1 2 3 4 5 6

DISPENSE

SOL

GRY

TAN GRN ORA

YEL PNK BLU

SERVER SENSOR

K2 N.O.

27124 050800

DUAL -ATF BREWER ECA W/SERVER SENSOR

L1

BLK-12

BLK

R T

S E L E C T O R

S

W

LIMIT

THERMOSTAT

PROTECTION SW

RED RED

FRACTIONAL BATCHES

(CONNECT

AS REQUIRED)

FULL BATCH

(NO CONNECTION)

WHI/VIO WHI/RED

WHI/ORA

GRY PNK TAN

BLK-12

READY

L.E.D.

OVERFLOW

TAN

GRY

YEL ORA

GRY PNK TAN

PNK

& TWO-GRINDER INTERFACE

GRN/YEL

t°

PNK

GRY GRY GRY

BRN/BLK

RED/BLK

RIGHT SW.

RIGHT BREW TIMER

BLU-12 BLU-12BLK-12

W

H

I

TANK HEATER

SW

ELECTRONIC

CONTROL ASSY

RED

WHI/VIO WHI/VIO GRY

1

RED

2

PNK

3

WHI/GRN

4

WHI/YEL

5

BYPASS

WHI/GRN

SOL

TANK HEATERS (TWO)

PNK

GRY

1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH

3/4 BATCH BATCH COMMON

4

GRINDER

3

INTERFACE

2

CONNECTOR

1

W

H

I

INTERLOCK

ASSY

WHI/ORA

BLK

WHI/ORA

ORA

YEL ORA

OPTIONAL RECOVERY BOOSTER

BLU-12 RED-12

K1 N.O.

BLU-12

TAN BLU

7

WHI/BRN

6

PIN 20

(PROBE)

5 4

BLK

3 2

1

BRN/BLK RED/BLK

START SW.

GRN

WHI/VIO

WHI/GRN

WHI/BLU

WHIRED

WHI/GRN

RECOVERY BOOSTER

1 2 3 4 5 6

DISPENSE

OPTIONAL

K2

REFILL

SOL

TAN GRN ORA YEL PNK BLU

WHI-12

SERVER SENSOR

WHI/VIO

L2

RED

4

GRY PNK TAN

GRINDER

3

INTERFACE

2

CONNECTOR

1

TAN

GRY

FRACTIONAL BATCHES

(CONNECT

L T

S E L E C T O R

S

W

AS REQUIRED)

FULL BATCH

(NO CONNECTION)

WHI/VIO WHI/RED

YEL ORA

WHI/ORA

PNK

1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH

3/4 BATCH BATCH COMMON

BLK

YEL ORA

ORA

LEFT SW.

LEFT BREW TIMER

RED

WHI/RED

WHI/RED GRY

1

RED

2

PNK

3

WHI/BRN

4

YEL

5

BYPASS

WHI/GRN

SOL

200 OR 240 VOLTS AC

2 WIRE

Page 43

RED

START SW.

WHI/RED

WHIRED

WHI/BRN WHI/RED

OPTIONAL

RECOVERY BOOSTER

WHI/BRN WHI/RED

K1

1 2 3 4 5 6

DISPENSE

SOL

GRY

TAN GRN ORA

YEL PNK BLU

SERVER SENSOR

K2 N.O.

27124 050800

LIQUID LEVEL

BOARD

VIO

1 2 3

PIN-20

4

PROBE

120/208 VOLTS AC OR

120/240 VOLTS AC

3 WIRE

Page 44

DUAL -TF BREWER ECA W/SERVER SENSOR

L1

BLK-12

BLK

R T

S E L E C T O R

S

W

LIMIT

THERMOSTAT

PROTECTION SW

RED RED

FRACTIONAL BATCHES

(CONNECT

AS REQUIRED)

FULL BATCH

(NO CONNECTION)

WHI/VIO WHI/RED

WHI/ORA

GRY PNK TAN

BLK-12

READY

L.E.D.

OVERFLOW

TAN

GRY

YEL ORA

PNK

GRY

PNK

GRINDER

INTERFACE

CONNECTOR

& ONE-GRINDER INTERFACE

TANK HEATERS (TWO)

W

H

I

INTERLOCK

ASSY

WHI/ORA

BLK

1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH

3/4 BATCH BATCH COMMON

YEL ORA

WHI/ORA

4

GRY

3

PNK

2

TAN

1

t°

PNK

GRY GRY GRY

BRN/BLK

RED/BLK

ORA

RIGHT SW.

RIGHT BREW TIMER

GRN

BLU-12 BLU-12BLK-12

W

H

I

TANK HEATER

ELECTRONIC

CONTROL ASSY

WHI

WHI/VIO WHI/VIO GRY

1

WHI

2

PNK

3

WHI/GRN

4

WHI/YEL

5

BYPASS

WHI/GRN

SOL

OPTIONAL RECOVERY BOOSTER

BLU-12 RED-12

BLU-12

7 6

SW

PIN 20

5 4 3 2 1

BRN/BLK RED/BLK

START SW.

TAN BLU

WHI/BRN

(PROBE)

BLK

GRN

WHI/VIO

WHI/GRN

K1 N.O.

WHI/BLU

1

WHIWHI

2 3 4 5 6

DISPENSE

WHI/GRN

OPTIONAL

RECOVERY BOOSTER

K2

REFILL

SOL

TAN GRN ORA

PNK BLU

SOL

RED

YEL

WHI-12

SERVER SENSOR

WHI/VIO

L2

WHI

N

GRIND

PNK

SELECTOR

SW

1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH

3/4 BATCH BATCH COMMON

BLK

GRY PNK TAN

TAN

GRY

FRACTIONAL BATCHES

(CONNECT

L T

S E L E C T O R

S

W

AS REQUIRED)

FULL BATCH

(NO CONNECTION)

WHI/VIO WHI/RED

YEL ORA

WHI/ORA

LEFT SW.

WHI

WHI/RED

WHI/RED GRY

1 2 3

4 5

BYPASS

SOL

WHI PNK

WHI/BRN

YEL

WHI/GRN

YEL ORA

ORA

LEFT BREW TIMER

120/208 VOLTS AC OR

120/240 VOLTS AC

3 WIRE

Page 45

WHI

START SW.

WHI/RED

WHIWHI

WHI/BRN WHI/RED

OPTIONAL

RECOVERY BOOSTER

WHI/BRN WHI/RED

K1

1 2 3 4 5 6

DISPENSE

SOL

GRY

TAN GRN ORA

YEL PNK BLU

SERVER SENSOR

K2 N.O.

27124 050800

L1

BLK-12

DUAL-ATF OR BTF BREWER W/SERVER SENSOR

LIMIT THERMOSTAT

BLK-12

& ONE-GRINDER INTERFACE

N.O.

BLK-12 BLK-12

TANK HEATERS (TWO)K1

READY INDICATORS

RED-12 RED-12

K1

N.O.

GRN/YEL

L2

RED-12

BLK

R T

S E L E C T O R

S

W

OVERFLOW

PROTECTION SW

RED RED

TAN

GRY

FRACTIONAL BATCHES

(CONNECT

AS REQUIRED)

FULL BATCH

(NO CONNECTION)

WHI/VIO WHI/RED

YEL ORA

WHI/ORA

GRY PNK TAN

PNK

GRINDER

INTERFACE

CONNECTOR

1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH

3/4 BATCH BATCH COMMON

4

GRY

3

PNK

2

TAN

1

SW. & THERMOSTAT

OPTIONAL

RECOVERY BOOSTER

RIGHT

RIGHT BREW TIMER

RED

SW.

RED

WHI/VIO WHI/VIO GRYWHI/VIO

1

2

PNK

3

WHI/GRN

4

WHI/YEL

5

BYPASS

WHI/GRN

SOL

K2 N.O. K3 N.O.

BLK

YEL ORA

WHI/ORA

BLKBLU

LIQUID LEVEL

BOARD

K1

REFILL

VIO

1

BLU

2 3

PIN-20

4

SOL

PROBE

RED

RED RED

RED

START SW.

TAN

1 2 3 4 5 6

DISPENSE

K2

SOL

GRN ORA

YEL PNK BLU

SERVER SENSOR

WHI/VIO

WHI/GRN

REDREDRED

WHI/GRN

OPTIONAL

RECOVERY BOOSTER

GRIND

GRY PNK TAN

SELECTOR

SW

TAN

GRY

FRACTIONAL BATCHES

(CONNECT

L T

S E L E C T O R

S

W

AS REQUIRED)

FULL BATCH

(NO CONNECTION)

WHI/VIO WHI/RED

YEL ORA

WHI/ORA

PNK

1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH

3/4 BATCH BATCH COMMON

BLK

LEFT BREW TIMER

YEL ORA

WHI/ORA

LEFT SW.

RED

START SW.

WHI/RED

WHI/RED GRYWHI/RED

1

2

PNK

3

WHI/BRN

4

YEL

5

BYPASS

WHI/GRN

SOL

WHI/BRN WHI/RED

200 OR 240 VOLTS AC

2 WIRE

Page 46

RED

TAN

1

REDREDRED

WHI/BRN WHI/RED

OPTIONAL

RECOVERY BOOSTER

2 3 4 5 6

DISPENSE

K3

SOL

GRN ORA

YEL PNK BLU

SERVER SENSOR

27124 050800

DUAL -ATF BREWER ECA W/SERVER SENSOR

L1

BLK-12

BLK

R T

S E L E C T O R

S

W

LIMIT

THERMOSTAT

PROTECTION SW

RED RED

FRACTIONAL BATCHES

(CONNECT

AS REQUIRED)

FULL BATCH

(NO CONNECTION)

WHI/VIO WHI/RED

WHI/ORA

GRY PNK

TAN

BLK-12

READY

L.E.D.

OVERFLOW

TAN

GRY

YEL ORA

GRY

PNK

GRINDER

INTERFACE

CONNECTOR

& ONE-GRINDER INTERFACE

GRN/YEL

t°

PNK

GRY GRY GRY

BRN/BLK

RED/BLK

RIGHT SW.

RIGHT BREW TIMER

W

H

I

1 2 3

4 5

BYPASS

BLU-12 BLU-12BLK-12

CONTROL ASSY

WHI/VIO WHI/VIO

RED

PNK WHI/GRN WHI/YEL

SOL

TANK HEATER

SW

ELECTRONIC

RED

WHI/GRN

TANK HEATERS (TWO)

PNK

INTERLOCK

ASSY

1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH

3/4 BATCH BATCH COMMON

4

GRY

3

PNK

2

TAN

1

W

H

I

ORA

WHI/ORA

BLK

YEL ORA

WHI/ORA

OPTIONAL RECOVERY BOOSTER

BLU-12 RED-12

K1 N.O.

BLU-12

TAN BLU

7

WHI/BRN

6

PIN 20

(PROBE)

5 4

BLK

3 2

1

BRN/BLK RED/BLK

START SW.

GRN

WHI/VIO

WHI/GRN

WHI/BLU

GRY WHIRED

WHI/GRN

RECOVERY BOOSTER

1 2 3 4 5 6

DISPENSE

OPTIONAL

K2

REFILL

SOL

TAN GRN ORA

PNK BLU

SOL

YEL

WHI-12

RED

SERVER SENSOR

WHI/VIO

L2

RED

GRY PNK

TAN

GRY

FRACTIONAL BATCHES

(CONNECT

L T

S E L E C T O R

S

W

AS REQUIRED)

FULL BATCH

(NO CONNECTION)

WHI/VIO WHI/RED

YEL ORA

WHI/ORA

PNK

1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH

3/4 BATCH BATCH COMMON

BLK

LEFT SW.

RED

WHI/RED WHI/RED

1 2 3

4 5

BYPASS

SOL

RED PNK

WHI/BRN

YEL

WHI/GRN

YEL ORA

ORA

LEFT BREW TIMER

200 OR 240 VOLTS AC

2 WIRE

Page 47

RED

START SW.

WHI/RED

WHI/BRN WHI/RED

GRY WHIRED

WHI/BRN WHI/RED

OPTIONAL

RECOVERY BOOSTER

K1

1 2 3 4 5 6

DISPENSE

SOL

GRY

TAN GRN ORA

YEL PNK BLU

SERVER SENSOR

K2 N.O.

Bunn Dual TF User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual