Bunn Single 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

27118.0000C 10/00 ©1996 Bunn-O-Matic Corporation

INTRODUCTION

This equipment will brew a half-gallon, gallon, or gallon and a three fourths batch of coffee into an awaiting server at the push of a button and includes a hot water faucet for allied beverage use. The brewer is specifically designed for use with a BUNN® .5 gallon and 1.75 gallon server. 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

27118 100400

 

USER NOTICES

The notices on this brewer should be kept in good condition. Replace unreadable or damaged labels.

 

 

NL

! WARNING

HOT WATER

L

 

 

00831.0000

ELECTRICAL REQUIREMENTS

 

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

Requires 2-wire, grounded service rated 120 volts ac, 20 amp, single phase, 60 Hz.

Requires 3-wire, grounded ser-

vice rated 120/208 volts or 120/240 ac, volts ac, 20 amp, single phase, 60 20

Hz.

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 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.

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 12" 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 14" flare.

NOTE – Bunn-O-Matic recommends 14" copper tubing for installations of less than 25 feet and 38" for more than 25 feet from the 12" 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.Attach the quickconnect fitting from the tubing (supplied) to the water inlet fitting on the bottom of the brewer.

2.Flush the water line and securely attach it to the flare fitting on the tubing (supplied).

3.Turn on the water supply.

Page 4

27118 100400

 

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.

4.Wait approximately twenty-five minutes on 208V, 240V Models or fifty minutes on 120V Models for the water in the tank to heat to the proper temperature.

5.Place an empty server beneath the brew station. Place the 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 or 224 oz - 1-3/4 gallon. 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 timer as required. Refer to Adjusting Brew Volumes. 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 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 to the needle valve will require a timer adjustment for volume.

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

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

Page 5

27118 100400

 

ADJUSTING BREW VOLUMES

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

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

1.Modifying batch sizes. To modify a batch volume, first check that the SET/LOCK switch is in the “SET” position on the circuit board.

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

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

2.Setting batch sizes. To set a batch volume, first check that the SET/LOCK switch is in the “SET” position on

the circuit board. Press and hold the START or BREW switch until three distinct clicks are heard, and then release the switch. (Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory). View the level of the liquid being dispensed. When the desired level is reached, turn the ON/OFF switch to “OFF” (lower). The brewer remembers this volume and will continue to brew batches of this size until the volume setting procedure is repeated.

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

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

Page 6

27118 100400

 

OPERATING CONTROLS

BREW SELECTOR SWITCH

Placing the switch in the 12 Gal, 1 Gal, or 134 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.

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 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. Make sure server size agrees with batch selection.

6Place 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 7

27118 100400

 

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 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. Brew

1. No power or incorrect voltage

(A1) Check the terminal block for

cycle will not start.

 

120 volts across the black and white

 

 

terminals on 120 volt two wire brew-

 

 

ers.

 

 

(A2) 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.

 

 

(A3) 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 server size agrees with

 

 

batch selection.

 

2. No water

Check plumbing and shut-off valves

Page 8

27118 100400

 

TROUBLESHOOTING (cont.)

 

 

 

Problem

Probable Cause

Remedy

Brew cycle will not start (cont.)

3. Water strainer/flow control (.500

(A) Direction of flow arrow must be

 

GPM)

pointing towards brewer.

 

 

 

(B) Remove the strainer/flow con-

 

 

 

trol and check for obstructions. Clear

 

 

 

or replace.

 

4.

ON/OFF switch

Refer to Service - ON/OFF switch for

 

 

 

testing procedures. See page 31

 

5.

Start switch

Refer to Service - Start switch for

 

 

 

testing procedures. See page 35

 

6.

Timer

Refer to Service - Timer for testing

 

 

 

procedures. See page 38 or 40

 

7.

Dispense Valve

Refer to Service - Dispense valve for

 

 

 

testing procedures. See page 22

 

8.

Control Assembly (Electronic)

Refer to Service - Electronic con-

 

 

 

trols for testing procedures. See

 

 

 

pages 23 thru 27

 

9.

Brew selector switch

Refer to Service - Brew selector

 

 

 

switch for testing procedures. See

 

 

 

page 16

 

10. Server sensor

Refer to Service - Server sensor for

 

 

 

testing procedures. See page 33

Automatic refill will not operate

1. No water

Check plumbing and shut-off valves.

 

2. Water strainer/flow control (.500

(A) Direction of flow arrow must be

 

GPM)

pointing towards brewer.

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

Page 9

27118 100400

 

TROUBLESHOOTING (cont.)

 

 

Problem

Probable Cause

Remedy

Automatic refill will not operate

3. Overflow protection switch

Refer to Service - Overflow protec-

(cont.)

 

tion switch for testing procedures.

 

 

See page 32

 

4. (A) Level control board & level

Refer to Service - Level control board

 

probe. (Electro/mechanical)

for testing procedures. See page 28

 

(B) Control Assembly (Electronic)

Refer to Service - Electronic con-

 

 

trols for testing procedures. See page

 

 

23 thru 27

 

5. Solenoid Valve

Refer to Service - Solenoid valve for

 

 

testing procedures. See page 34

Beverage level will not adjust (Selec-

1. Selector switch

Refer to Service - Selector switch for

tor switch in any position)

 

testing procedures. See page 16

Water flows into tank continuously

1. Timer

Refer to Service - Timer for testing

(ON/OFF Switch "ON")

 

procedures. See page 38 or 40

Water flows into tank continuously

1. (A) Level control board and level

Refer to Service - Level control board

(ON/OFF Switch "OFF")

probe (Electro/mechanical)

for test procedures. See page 28

 

(B) Control assembly (Electronic)

Refer to Service - Control assembly

 

 

for testing procedures. See page 23

 

 

thru 27

 

2. Overflow protection switch

Refer to Service - Overflow protec-

 

 

tion switch for testing procedures.

 

 

See page 32

 

3. Solenoid Valve

Refer to Service - Solenoid valve for

 

 

testing procedures. See page 34

Water from tank is not hot

1. Limit thermostat

Refer to Service -Limit thermostat

 

CAUTION - Do not eliminate or by-

for testing procedures. See page 30

 

pass limit thermostat. Use only

 

 

B.O.M. part #23717.0001

 

Page 10

27118 100400

 

TROUBLESHOOTING (cont.)

 

 

Problem

Probable Cause

Remedy

Water from tank is not hot (cont.)

2. (A) Control Thermostat (Electro/

Refer to Service - Control thermo-

 

mechanical)

stat for testing procedures. See page

 

 

20

 

(B) Control assembly (Electronic)

Refer to Service - Control assembly

 

 

for testing procedure. See page 23

 

 

thru 27

 

3. Contactor (Electro/mechanical)

Refer to Service - Contactor for test

 

 

procedures. See page 18

 

4. Tank heater

Refer to Service - Tank heater for

 

 

testing procedures. See page 36

 

5. Triac assembly (Electronic)

Refer to Service - Triac assembly for

 

 

removal and replacement.See page

 

 

27

Spitting or unusual steaming from

1. (A) Control thermostat (Electro/

Refer to Service - Control thermo-

sprayhead or airvent.

mechanical)

stat for testing procedures. See page

 

 

20

 

(B) Control assembly (Electronic)

Refer to Service - Control assembly

 

 

for testing procedures. See page 23

 

 

thru 27

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.

Refer to Service - Triac assembly for testing procedures. See page 27

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

Page 11

27118 100400

 

TROUBLESHOOTING (cont.)

 

 

Problem

Probable Cause

Remedy

Inconsistent beverage level in server.

1. Strainer/flow control (.500 GPM)

(A) Direction of flow arrow must be

 

 

pointing towards the brewer.

 

 

(B) Remove the strainer/flow con-

 

 

trol and check for obstructions. Clear

 

 

or replace.

 

2. Improper water pressure

Check the operating water pressure

 

 

to the brewer. It must be between 20

 

 

and 90 psi (138 and 620 kPa)

 

3.

Dispense valve

Consistently high or low beverage

1.

Timer adjustment

level in server.

 

 

Dripping from sprayhead.

1.

Dispense valve

Water overflows filter.

1.

Bypass valve

 

2.

Type of paper filters

 

3.

No sprayhead

Beverage overflows server.

1.

Beverage left in server

 

2.

Timer adjustment

3. Dispense valve

Refer to Service - Dispense valve for testing procedures. See page 22

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

Refer to Service - Dispense valve for testing procedures. See page 22

Refer to Adjustments on page 5 step #7. For test procedures see page 15

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 224 oz for each 1-3/4 gallon brew cycle.

Refer to Service - Timer for testing procedures. See page 38 or 40

Refer to Service - Dispense valve for testing procedures. See page 22

Page 12

27118 100400

 

TROUBLESHOOTING (cont.)

 

 

Problem

Probable Cause

Remedy

Weak beverage

1. Type of paper filters

BUNN® paper filters should be used

 

 

for proper extraction.

 

2. Coffee

A sufficient quantity of fresh drip or

 

 

regular grind should be used for

 

 

proper extraction.

 

3. Sprayhead

B.O.M. sprayhead #01082.0002

 

 

should be used to properly wet the

 

 

bed of ground coffee in the funnel.

 

4. Funnel loading

The BUNN® paper filter should be

 

 

centered in the funnel and the bed of

 

 

ground coffee leveled by gentle shak-

 

 

ing.

 

5. Water temperature

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 tem-

 

 

perature immediately below the

 

 

sprayhead with a thermometer. The

 

 

reading should not be less than 195°

 

 

F.

Brewer is making unusual noises.

1. Solenoid (Inlet)

The nut on back of the solenoid must

 

 

be tight or it will vibrate during op-

 

 

eration

 

2. Plumbing lines

Plumbing lines should not be rest-

 

 

ing on the counter top.

 

3. Water supply

(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).

 

4. Tank heater

Remove and clean lime off the tank

 

 

heater.

 

5. Contactor

Check for low voltage.

 

Page 13

27118 100400

 

 

SERVICE

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 - Disconnect the brewer from the power source 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 warmer base plate.

The top cover is attached with one #4-40 slotted head screw.

The front inspection panel is attached with four #6- 32 slotted head screws.

The server plateform is attached with seven #6-32 slotted head screws.

 

 

 

CEDU

RES

 

 

PRO

 

OPER

ATING

 

 

 

 

 

 

 

 

UTION

!

CA

P1014

Contents

 

Brewer Selector Switch.........................................

16

Bypass Valve ........................................................

15

Contactor Assembly..............................................

18

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

20

Dispense Valve .....................................................

22

Electronic Control ....................................

23 thru 27

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

28

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

30

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

31

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

32

Proximity Sensor ..................................................

33

Solenoid (Inlet) .....................................................

34

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

35

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

36

Timer ...............................................................

38,40

Wiring Diagrams ......................................

42 thru 45

Page 14

27118 100400

 

SERVICE (cont.)

diagrams and check the brewer wiring harness.

BYPASS VALVE

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 wires if necessary and proceed to #6.

If continuity is not present as described, replace the bypass valve.

 

 

 

 

6. Check the bypass valve for coil action. Connect

TL1

TL2

TL3

TL4

TL5

 

 

 

 

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.

P999

If the sound is heard as described, there may be a

 

Location:

blockage in the water line before the bypass valve or

the bypass valve may require inspection for wear and

The bypass valve is located inside the right front

removal of waterborne particles.

of the hood.

If the sound is not heard as described, replace the

 

Test Procedures:

bypass valve.

 

 

1. Disconnect the brewer from the power source and

Removal and Replacement:

place a 1-3/4 gallon server under funnel.

1.

Remove the wires from the bypass valve.

2. Disconnect the white/green wire and the white/

2. Drain enough water from the tank so bypass valve

violet wire from the bypass valve.

 

is above the water line.

NOTE: ECA MODELS ONLY - Brewer must be at

 

3. Remove water lines from valve.

operating temperature to perform step #3 or brew-

4. Remove two nuts retaining bypass valve inside the

lock must be bypassed. To bypass brew-lock

 

hood and remove bypass valve.

disconnect white/yellow and orange wires from

 

5. Remove hose barb fitting and attach to new by-

interlock of ECA and connect harness leads to-

 

pass valve.

gether.

 

6. Install new bypass valve with hose barb fitting.

3. Check the voltage across the white/green and the

7. Reconnect the water tubes and the wires to the

white/violet wires with a voltmeter. Connect the

 

bypass valve.

brewer to the power source. With the "ON/OFF"

 

8. Refer to the illustration below when reconnecting

switch in the "ON' position, the selector switch in

 

the wires.

the 1 or 1-3/4 gallon position press the start

 

 

 

switch. The indication must be:

 

WHI/GRN to Dispense Valve

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

 

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

 

WHI/VIO to Brew Selector Switch

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.

 

P774

If voltage is not present as described refer to the wiring

 

 

 

Page 15

27118 100400

 

SERVICE (cont.)

BREW SELECTOR SWITCH

 

 

 

DURE

S

 

 

OCE

 

 

RATIN

G PR

 

 

OPE

 

 

 

!

CAUTION

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

10.Reconnect the pink, gray and tan wires on the selector switch to the pink, gray and tan wires on the interface.

Bypass Valve:

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

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

13.Reconnect the white/violet to the bypass valve coil

P1014

and the white/red to the dispense valve coil.

 

Location:

The brew selector switch is located in the front right side of the hood.

Test Procedure:

Timer:

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:

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

8.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 present in any other position.

Server Sensor:

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

15.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.

16.Check for continuity across the white/orange and orange wires on 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.

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

If continuity is present as described the switch is operating properly.

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

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.

Page 16

27118 100400

 

Page 17

SERVICE (cont.)

CONTACTOR ASSEMBLY (W/MECHANICAL THER-

MOSTAT ONLY)

 

TL1

TL5 TL4 TL3 TL2

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.

5. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #6.

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

6.Check for continuity between the two black wires of the contactor coil.

P999

Location:

The contactor assembly is located inside the hood just behind the dispense valve.

Test Procedures:

Mechanical Thermostat

1.Disconnect the brewer from the power source.

2.Disconnect the white wire of the two pole 120V terminal block, white wire of the three pole 120/ 208V or 120/240V or the red wire of the two pole 200V or 240V terminal block and the black wire of the contactor coil and disconnect the black wire of the control thermostat from the remaining black wire of the contactor coil.

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

4.Check the voltage across the white wire from the terminal block on 120,120/208, 120/240 volt units or the red wire from 200, 240 volt units and the black wire from the control thermostat with a voltmeter when the thermostat is turned clockwise to the "FULL ON" position. Connect the brewer to the power source. The indication must be:

If continuity is present as described, reconnect one black wire to the white wire or red wire from the terminal block and the other black wire to the black wire from the control thermostat. Reinstall capillary tube into tank to line 7" above the bulb and proceed to #7.

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

7.Locate the white wire or red wire on L1 terminal and black wire on the L2 terminal on the contactor.

8.Carefully check the voltage across the white or red and black wires with a voltmeter. The indication must be:

a.) 120 volts ac for two wire 120 volt models, 208 volts ac for three wire 120/208 volt models and 240 volts ac for three wire 20/240 volt models. b.) 200 to 240 volts ac for two wire 200 or 240 volt models.

9.Disconnect the brewer from the power source.

If voltage is present as described, proceed to #10.

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

10.Check for continuity across the terminals on the left side of the contactor by manualy closing the contacts. Continuity must not be present when the contact is released.

11.Check for continuity across the terminals on the right side of the contactor by manualy closing the contacts. Continuity must not be present when the contact is released.

Page 18

SERVICE (cont.)

CONTACTOR ASSEMBLY (W/ MECHANICAL THER-

MOSTAT ONLY) (cont.)

If continuity is present as described, the contactor is operating properly.

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

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 illustration below when reconnecting the wires.

P828

Page 19

27118 100400

 

CONTROL THERMOSTAT

P999

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 wires on the control thermostat.

3.Check the voltage across the blue wires on the control thermostat and the white insert on the two or three pole 120V, 120/208V, 120/240V terminal block and the red insert on two pole 200V or 240V terminal blocks with a voltmeter. 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.

4.Disconnect the brewer from the power source.

Page 20

SERVICE (cont.)

CONTROL THERMOSTAT (cont.)

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 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.

P842

Page 21

27118 100400

 

0

SERVICE (cont.)

If voltage is not present as described, refer to the

DISPENSE VALVE

wiring diagrams and check the brewer wiring harness.

Location:

4. Check for continuity across the dispense valve coil

Dispense valve is located inside the hood

directly above the sprayhead.

 

terminals.

1

 

If continuity is present as described, reconnect the

22978.0000

wires to the dispense valve, brew-lock wires if neces-

 

 

 

sary and proceed to #5.

 

If continuity is not present as described, replace the

 

dispense valve.

 

5. Check the dispense valve for coil action. Connect

 

 

the brewer to power source. Place the "ON/OFF"

 

 

switch in the "ON" position, press and release the

 

 

start switch. Listen carefully in the vicinity of the

 

 

dispense valve for a "clicking" sound as the coil

 

 

magnet attracts and repels the plunger.

 

6. Disconnect the brewer from the power source.

 

If the sound is heard as described, there may be a

 

blockage in the dispense valve or the water line to the

 

sprayhead. Remove the dispense valve and inspect for

 

wear, and remove waterborne particles.

8

 

If the sound is not heard as described, replace the

 

dispense valve.

P999

Removal and Replacement:

 

Test Procedures:

1.

Disconnect wires from dispense valve.

1. Disconnect the brewer from the power source.

2. Drain enough water from the tank so the dispense

NOTE: ECA MODELS ONLY - Brewer must be at

 

valve is above the water line.

1

operating temperature to perform step #2 or brew-

3.

Remove water lines and hose barb fitting from

lock must be bypassed. To bypass brew-lock

 

dispense valve.

disconnect white/yellow and orange wires from

4. Remove dispense valve from the sprayhead panel.

interlock of ECA and connect leads together.

5. Install new dispense valve .

2. Disconnect the wires from the dispense valve and

6. Reconnect the water lines, hose barb fitting and

check the voltage across the white/violet wire and

 

the wires to the dispense valve.

1

white/green wire. Connect brewer to the power

7. Refer to the illustration below when reconnecting

source. Place the "ON/OFF" switch in the "ON"

 

wires.

position, press and release the start switch. The

 

 

indication must be:

 

 

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

 

WHI/VIO to Timer TL1

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

 

WHI/VIO to ON/OFF Switch

volt models.

 

WHI/RED to Brew Selector Switch

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

 

WHI/GRN to Timer TL4

 

 

WHI/GRN to By-Pass Valve

7models.

3. Disconnect brewer from the power source.

 

 

If voltage is present as described in step 2 proceed to

 

 

#4.

 

P829

 

 

2

Page

 

 

ELECTRONIC CONTROL ASSEMBLY

PROBLEM:

LIQUID LEVEL CONTROL SYSTEM DOES NOT REFILL

 

REMOVE POWER

OVERFLOW CUP FULL

YES

DRAIN CUP (4)

(4)

 

 

RETRY

NO

 

DISCONNECT LEVEL PROBE

 

(7)

 

VOLTAGE PRESENT AT

YES

DOES WATER FLOW

 

YES

SOLENOID VALVE

 

 

 

 

 

 

(12)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

 

 

 

REPLACE PROBE

 

 

 

 

 

 

 

NO

(7)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REPLACE

 

REPLACE

 

 

 

CONTROL

 

 

 

 

 

SOLENOID VALVE

 

 

 

ASSEMBLY (1)

 

 

 

 

 

(12)

 

 

 

 

 

 

 

 

 

1.Electronic Control

2.Terminal Block

3.Timer

4.Liquid Level Switch & Overflow Cup

5.Tank Heater

6.Limit Thermostat

7.Liquid Level Probe

Location:

The electronic control assembly (1) is located inside the lower left front on the component bracket of the brewer. Access will also be needed to the temperature sensor (8), liquid level probe (7) located on the tank lid and to the triac assembly (15) located beneath the tank.

General:

This system controls the liquid level and water temperature of the brewer. These two functions act independently of each other and should be tested separately.

BREW START - LOCK

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

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.)120 volts ac for two wire 120 volt models,208 volts ac for three wire 120/208 volt models 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 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.) 120 volts ac for two wire 120 volt models,

three wire 120/208 volt models andr th mode1).YE9J

Page 23

SERVICE (cont.)

ELECTRONIC CONTROL ASSEMBLY (cont.)

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 dispenser.

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.)120 volts ac for two wire 120 volt models, three wire 120/208 volt models and 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 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.)120 volts ac for two wire 120 volt models, three wire 120/208 volt models 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.

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.

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

OVERFLOW

?

YES

DRAIN CUP (4)

DISCONNECT WIRE

FROM

SOLENOID VALVE (12)

RETRY

OVERFLOW

?

NO

REPLACE

CONTROL

ASSEMBLY (1)

NO

REPLACE PROBE (7)

YES

REPLACE SOLENOID

 

VALVE (12)

Page 24

27118 100400

 

SERVICE (cont.)

ELECTRONIC CONTROL ASSEMBLY (cont.)

PROBLEM

WATER NOT HOT ENOUGH

LED ON CONSTANTLY

NO

 

TURN TEMPERATURE

 

 

 

 

ADJUSTING SCREW (14)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CLOCKWISE CONTINUOUSLY

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MEASURE VOLTAGE

 

 

 

 

 

YES

 

 

 

 

LED ON

ADJUST FOR CORRECT

AT TANK HEATER (5)

 

?

 

 

 

WATER TEMPERARURE

 

 

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REPLACE CONTROL

 

 

 

 

 

YES

 

 

ASSEMBLY (1)

 

 

VOLTAGE PRESENT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REPLACE TANK

 

 

 

 

 

 

 

 

HEATER (5)

 

 

 

 

NO

 

 

 

 

 

 

 

 

LIMIT THERMOSTAT (6)

NO

 

 

REPLACE LIMIT

 

 

OK

 

 

 

THERMOSTAT (6)

 

 

 

 

 

 

 

 

 

 

?

YES

REPLACE CONTROL

ASSEMBLY (1)

MEASURE VOLTAGE

AT TANK HEATER (5)

REPLACE TRIAC (15)

Temperature Control Test Procedure

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.) 120 volts ac for two wire 120 volt models, 208 volts ac for three wire 120/208 volt models 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 LED indicator on the electronic control circuit board (13).

6.Disconnect the brewer from the power source.

VOLTAGE PRESENT

NO CHECK FOR SPLIT

If the indicator was on or blinking, the temperature

 

 

TANK HEATER (5)

 

 

 

 

 

 

 

 

REINSTALL ORIGINAL

sensor is operating properly, proceed to #7.

 

 

 

CONTROL ASSEMBLY (1)

 

YES

 

 

If the indicator was off, check the sensor connection

 

 

 

RECHECK WATER

 

 

on the electronic control circuit board and/or replace

TEMPERATURE

 

 

 

 

 

P844

the temperature sensor (8) and the electronic control

 

 

 

 

assembly (1).

 

 

 

PROBLEM:

NOTE - each temperature sensor is calibrated to an

 

 

WATER BOILS

electronic control assembly. Both components

 

 

 

 

MUST be replaced as a set.

DRAIN CUP (4)

 

 

 

RETRY

LED (11)(13) ON

YES

 

REPLACE CONTROL

WHILE BOILING

 

 

ASSEMBLY (1)

 

NO

 

 

 

 

 

 

 

DISCONNECT BLUE WIRE

 

 

 

FROM CONTROL BOARD PIN #7

 

 

 

RETRY

 

 

 

 

 

 

 

CHECK FOR SPLIT

 

 

 

 

 

 

 

 

STILL BOILING

NO

 

TANK HEATER (5)

 

 

?

 

 

 

REPLACE TRIAC (15)

 

 

 

 

 

NO

 

 

 

 

 

 

 

REPLACE CONTROL

 

 

 

ASSEMBLY (1)

 

 

 

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

a.) 120 volts ac for two wire 120 volt models, 208 volts ac for three wire 120/208 volt models 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 board is on or blinking.

8.Disconnect the brewer from the power source.

P845

Page 25

27118 100400

 

SERVICE (cont.)

ELECTRONIC CONTROL ASSEMBLY (cont.)

If voltage was present as described, the temperature control of the system is operating properly.

If voltage was not present as described, contact Bunn- O-Matic to order an electronic control assembly (1), temperature sensor (8), and triac assembly (15) for revaluation and proceed to #9.

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.) 120 volts ac for two wire 120 volt models, 208 volts ac for three wire 120/208 volt models 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 board is on or blinking.

11.Disconnect the brewer from the power source.

If voltage was present as described, return the new triac assembly (15) 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 (15).

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.) 120 volts ac for two wire 120 volt models, 208 volts ac for three wire 120/208 volt models and 240 volts ac 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 illustrationon next page when reconnecting the wires.

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

Page 26

27118 100400

 

SERVICE (cont.)

7.

Remove the two #8-32 keps nuts securing tank to

ELECTRONIC CONTROL ASSEMBLY (cont.)

 

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.

 

10.

Remove triac/heat sink from tank mount

 

 

ing bracket and discard.

 

11.

Install new triac/heat sink assembly on

 

 

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 two #8-32 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 reconnect-

 

 

ing wires.

P924

 

 

Triac Assembly Removal and Replacement

 

 

NOTE - each triac installation requires the use of an

 

P923

 

 

approved silicone heat sink compound. Bunn-O-

 

 

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 tank heater, blue from electronic control and tan from tank heater switch.

5.Carefully set the brewer on its back.

6.Remove the 2" dia hole plug from the bottom cover.

Page 27

27118 100400

 

models

b.)

ond.

volt

wire

a.)120

models

b.)200

ond.

volt

wire

a.)120

The

f

SERVICE (cont.)

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

TL1

TL2

TL3

TL4

TL5

P999

Location:

The level control board is located inside the front in center of the brewer on the component bracket. The level probe is located inside the hood on the center rear of the tank lid.

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 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.

4.Disconnect the brewer from the power source.

 

 

after

a

delay

 

 

of

 

 

approximately

1

 

second.195 Disconnect

 

 

If

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If

 

voltage

 

is

 

 

not

 

 

present

 

as

 

described,

 

replace

control board.

 

200

 

to

 

 

240

 

 

volts

 

ac

 

for

 

two

115 Reconnect

 

the

 

pink

 

 

wire

 

to

 

terminal

 

4.125 Gently

 

 

 

The

 

indication

 

must

 

 

be:

 

 

 

 

 

 

 

 

 

a

 

.

)

 

1

 

2

 

 

0

 

 

 

 

 

 

three

models

after

a

delay

of

 

approximately

 

 

15. Move the probe's flat end to the brewer housing.

 

120/240

 

 

 

sec-

 

 

 

 

 

 

 

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

1

 

 

 

 

 

 

 

1

second.

 

 

 

 

 

 

 

the

 

 

 

 

 

 

 

b.) 200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

models

 

after

a

 

 

delay

 

of

approximately

1

120/2082volt

 

second.

 

 

 

If voltage is not present as described, refer to

 

The indication must be 0.

 

brewer

 

 

 

after

a

delay

 

 

of

 

 

approximately

1

 

second.8.

Touch

 

 

 

to

 

240

 

 

volts

 

 

16. Moveac

the probe's flat for

end away from thetwo

wire

 

wiring diagrams and check the brewer wiring harness.

 

 

 

 

 

 

 

 

models

after

a

delay

of

 

approximately

 

1

sec-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 28

 

120/2082volt

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

indication

must

 

 

 

be:

 

 

 

 

 

 

 

 

 

r

o

m

a

n y

 

 

m

 

e t

a l

 

s

u r

f a c e

 

o

2BUNN297810000

7

1

1

0

.

6

0

0

4

0

0

5

.

R

e

c

o

n

n

e

c

t

t

h

e

v

i

o

l

e

t

SERVICE (cont.)

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

housing. The indication should again 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 after a delay of approximately 1 second.

17. Disconnect the brewer from the power source.

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 and lockwashers 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.

P832

Page 29

27118 100400

 

SERVICE (cont.)

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 illustration below when reconnectng the wires.

TL1

TL2

TL3

TL4

TL5

BLK to Terminal

Block (Black Insert)

BUNN

P999

BLK to Tank Heater (Left Terminal) BLK to Contactor Terminal

P833

Location:

The limit thermostat is located inside the hood on the tank lid just to the left of the tank heater.

Test Procedure:

1.Disconnect the brewer from the power supply.

2.Disconnect both black wires from the limit thermostat.

3.Check for continuity across the limit thermostat terminals with a ohmmeter.

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.

Page 30

27118 100400

 

22978 0000

SERVICE (cont.)

ON/OFF SWITCH

 

 

 

CEDU

RES

 

 

G PRO

 

 

ATIN

 

 

OPER

 

 

 

 

 

 

 

 

 

UTIO

N

 

CA

 

!

 

 

P1014

Location:

The ON/OFF switch is located on the front of the hood in the center to the right of the start switch.

Test Procedure:

1.Disconnect the brewer from the power source.

2.Viewing the switch from the back remove the red or white wire from the upper right terminal and the black wire from the center terminal.

3.Check the voltage across the red or white wire and the black wire with a voltmeter. 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.

4.Disconnect the brewer from the power source.

If voltage is present as described, reconnect the red or white wire, and proceed to #5.

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

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

6.Check for continuity across the center and lower

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/violet wire on the 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 following below when reconnecting the wires.

P1064

Page 31

27118 100400

 

22978.0000

 

 

 

 

TL1

TL2

TL3

TL4

TL5

BUNN

 

 

 

 

271183100400

 

 

 

 

SERVICE (cont.)

SERVER SENSOR

WARN

ING

 

BUNN

P1009

Location:

The server sensor is attached to the bottom side of the server platform.

With brew selector switch in the 1/2 gallon position the server sensor will allow a brew cycle to start with a 1/2 gallon server only.

With brew selector switch in the 1 gallon or 1-3/4 gallon position the server sensor will allow a brew cycle to start with a 1-3/4 gallon server only.

If the correct server is used for the selected batch size and the brew cycle will not start, procede with the test procedures.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the terminal plug on the wiring harness from terminal plug on the server sensor.

3.Check the voltage across the gray wire (pin #1) and the white wire or red wire (pin #2) on the wiring harness with a voltmeter and with the "ON/OFF" switch 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 on 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.

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/yellow and orange wires from interlock of ECA and connect harness leads together.

5.Disconnect the white/yellow wire from timer terminal TL5.

6.Check for continuity between the white/yellow wire disconnected from timer terminal TL5 and the yellow wire (pin #4) on the server sensor terminal plug of the wiring harness with the brew selector switch in the 1/ 2 batch position and the start switch depressed.

7.Select the 1 gallon or 1-3/4 gallon setting on the brew selector switch.

8.Check for continuity between the white/yellow wire disconnected from timer terminal TL5 and the orange wire (pin #3) on the server sensor terminal plug of the wiring harness and the start switch depressed.

9.Reconnect the white/yellow to timer terminal TL5 and brew-lock if necessary.

10.Disconnect the pink wire from timer terminal TL3.

11.Check continuity between the pink wire removed from timer terminal TL3 and the pink wire (pin #5) on the

server sensor terminal plug of the wiring harness. 12 Reconnect the pink wire to timer terminal TL3.

If continuity is present as described the server sensor wiring is operating properly. Replace the server sensor. If continuity is not present as described refer to the wiring diagrams and check brewer wiring harness.

Removal and Replacement:

1.Remove the four #6-32 slotted head screws securing the server platform to the brewer base.

2.Lift server platform high enough to be able to disconnect the server sensor terminal plug from the terminal plug on the wiring harness. Disconnect the plugs.

3.Turn the server platform over and remove the two #8- 32 Keps nuts securing the server sensor to the weld stud on the server platform.

4.Remove the server sensor leaving the two spacers in place.

5.Install new server sensor on the weld studs and secure with two #8-32 Keps nuts.

6.Reconnect the terminal plug on the server sensor to the terminal plug on the wiring harness.

7.Reinstall server platform on the brewer base using four #6-32 Slotted head screws.

Page 33

27118 100400

 

Page 34

SERVICE (cont.)

START SWITCH

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.

 

 

OCED

URES

 

 

 

 

ATIN

G PR

 

OPER

 

 

 

 

 

UTIO

N

 

CA

 

!

 

 

P1014

P1012

Location:

The momentary start switch is located in front of hood just to the left of the ON/OFF switch.

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.

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.

Page 35

27118 100400

 

TANK HEATER

22978.0000

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.Disconnect wires from the tank heater.

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

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

P999

Location:

The tank heater is located inside the hood on the right rear of the tank lid.

Test Procedure: Electro/Mechanical Models.

1. Disconnect the brewer from the power supply.

2Check the voltage across the black and the red wire on 120V, 208 or 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.)120 volts ac for two wire 120 volt models,208 volts ac for three wire 120/208 volt models 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.

NOTE - If the tank heater remains unable to heat, remove and inspect the heater for cracks in the sheath.

T

Page 36

SERVICE

SERVICE (cont.)

TANK HEATER (cont.)

Electronic Control Models:

1.Disconnect the brewer from the power source.

2.Disconnect wires from heater.

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 heater for cracks in the sheath.

Removal and Replacement:

1.Remove wires from tank heater.

2.Remove the four #8-32 nuts securing tank heat 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.

BLK to Contactor T2

 

 

BLK to Limit Thermostat

 

 

 

 

 

 

 

RED to Contactor T1

 

 

 

BLU Lead from

 

 

 

 

 

 

 

 

Triac Assy

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ELECTRO/MECHANICAL

ELECTRONIC

P837

Page 37

27118 100400

 

SERVICE (cont.)

TIMER (First Type)

3

4

2

5

1

.5

TESTIC

INU-MA

VAC

NMN-O-

120

 

BU2620

 

 

P/N

 

 

P1000

Location:

The timer is located inside the left front of the brewer on the upper part of the component bracket.

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 brewlock must be bypassed. To bypass brew-lock disconnect white/yellow and orange wires from interlock of ECA and connect harness leads together.

5.Place 1/2 gallon server under the funnel and select 1/2 gallon position on 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 two wire 120 volt models, three wire 120/208 volt models and three wire 120/240 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 1-3/4 gallon server under 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 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.

4.Disconnect the brewer from the power source.

If voltage is present as described, reconnect pink wire to TL3,white/green wire to TL4, white/yellow wire to

If voltage is present as described timer is operating properly.

If voltage is not present as described, replace the timer.

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 page when reconnecting wires.

6.Adjust timer dial(s) as required.

Page 38

SERVICE (cont.)

TIMER (First Type)(cont.)

 

 

 

 

 

 

 

 

 

 

 

 

5

6

 

 

 

 

 

 

 

 

IC

 

 

4

 

 

 

 

 

 

N

-O

-MAT

 

3

 

 

7

 

 

 

BUN

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

8

 

 

 

 

 

 

5

 

 

 

 

 

 

 

 

 

3

 

 

 

2

 

 

 

 

 

 

2

2

 

 

 

 

6

 

1

 

INUT

ES

1

.5

 

2.5

 

 

 

 

 

 

 

M

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

INUTES

 

 

 

C

 

 

 

3

 

M

0

VA

 

 

 

 

 

 

 

 

12

 

 

.5

 

ES

 

 

 

 

 

 

 

 

 

 

 

INUT

 

 

6-

000

0

 

 

 

 

 

M

 

 

 

 

 

 

 

 

 

 

2448

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P/N

 

 

 

 

 

 

 

 

 

 

 

WHI/VIO TL1 to ON/OFF Switch WHI/VIO TL1 to Server Sensor

WHI TL2 to Terminal Block and Server Sensor (120V Two Pole, 120/208V or 120/240V Three Pole Terminal Block)

RED TL2 to Terminal Block and Server Sensor (200V or 240V Two Pole Terminal Block)

PNK TL3 to Server Sensor PNK (Pin 5)

WHI/GRN TL4 to Dispense Valve

WHI/YEL TL5 to Start Switch

P1011

Page 39

27118 100400

 

SERVICE (cont.)

DIGITAL TIMER (SecondType)

TL1

TL2

TL3

TL4

TL5

BUNN

P999

Location:

The timer is 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 WHI/ORA wire from terminal TL3 and the WHI/YEL wire from terminal TL5. Check for continuity across the two wires when the start

switch is pressed to the "START" position.

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 four #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 illustration below when reconnecting the wires.

5.Install new circuit board with nylon spacers to component mounting bracket using two #6-32 screws.

6.Adjust the timer as described below.

Page 40

27118 100400

 

SERVICE (cont.)

TIMERS (Second Type)(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 volume, 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).

TL1

TL2

TL3

TL4

TL5

LOCK

J2

J1

SET

 

LOCK

SET

 

TIMER WIRING

WHI/YEL wire to TL5

WHI/GRN wire to TL4 WHI/ORA wire to TL3

WHI wire to TL2 (120V Two Pole, 120/208V or 120/240V Three Pole Terminal Block)

RED wire to TL2 (200V or 240V Two Pole Terminal Block)

WHI/VOI wire to TL1

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 becomes 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 41

27118 100400

 

SCHEMATIC WIRING DIAGRAM

SINGLE BREWER ECA-TF W/ SERVER SENSOR

L1

GRN

L2 N

 

 

 

LIMIT

 

 

 

 

 

 

 

 

 

 

 

 

THERMOSTAT

 

TANK HEATER

 

 

 

 

 

 

RED-12 (208 OR 240V)

BLK-12

BLK-12

 

 

BLU-12

 

 

WHI-12 (120V)

 

W

 

 

 

 

 

 

 

 

 

 

TAN

 

 

 

 

 

W

 

 

 

 

 

 

 

 

 

 

t° H

 

 

 

 

 

 

 

 

 

 

 

 

 

BLU

 

 

 

 

 

 

 

H

I

 

 

7

 

 

 

 

 

 

 

I

 

 

 

WHI/BRN

 

 

 

 

 

 

 

 

 

TANK HEATER

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

READY

 

PNK

PNK

 

SW

 

PNK 20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L.E.D.

 

GRY

GRY

 

 

 

(PROBE)

 

 

 

 

 

 

 

INTERLOCK

GRY

 

 

5

 

 

RED (208 OR 240V)

 

 

 

GRY

 

 

 

 

 

WHI (120V)

 

 

 

ASSY

 

 

4

BLK

 

 

 

 

 

ORA

 

 

 

 

 

 

 

 

 

ELECTRONIC

3

 

 

REFILL

 

 

 

 

 

 

GRN

 

 

 

 

 

 

 

WHI/YEL

 

 

 

 

 

 

 

2

WHI/BLU

WHI

 

OVERFLOW

 

 

 

CONTROL ASSY

 

SOL

 

 

 

 

 

1

 

 

 

 

 

PROTECTION SW

 

 

 

 

 

 

 

 

 

 

BLK

RED

RED

 

 

 

 

 

 

 

 

 

 

N.C.

 

 

 

 

 

 

WHI/YEL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BLK

 

 

 

 

 

WHI

 

 

 

 

 

WHI

 

 

 

 

 

 

 

 

START SW.

 

 

 

 

 

TAN

 

BLK

 

WHI/VIO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GRY

 

1/4 BATCH

 

1

WHI/VIO

 

WHI/VIO

GRY

1

TAN

 

 

 

 

 

WHI

 

WHI

WHI

GRN

 

 

FRACTIONAL BATCHES

 

1/3 BATCH

BREW

2

 

2

 

 

(CONNECT

 

1/2 BATCH

PNK

 

 

 

ORA

 

 

AS REQUIRED)

 

2/3 BATCH

TIMER 3

 

 

 

3

SERVER

 

 

 

WHI/GRN

 

 

 

YEL

 

FULL BATCH

 

3/4 BATCH

 

4

 

 

 

4

SENSOR

 

(NO CONNECTION)

PNK

 

WHI/YEL

 

 

 

PNK

 

 

BATCH COMMON

 

5

 

 

 

5

 

 

 

 

 

 

 

 

 

 

BLU

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

BYPASS

S

WHI/VIO

SOL

WHI/GRN

WHI/GRN

 

 

 

WHI/VIO

 

 

 

 

 

E

WHI/RED

 

 

WHI/RED

SOL

L

 

 

YEL

YEL

 

 

E

 

 

 

ORA

ORA

 

 

DISPENSE

C

 

 

WHI/ORA

 

 

 

T

 

 

 

 

O

 

 

 

 

 

R

 

 

 

 

 

S

W

 

 

 

 

 

 

 

 

 

GRY

 

GRY

4

GRINDER

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

INTERFACE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PNK

PNK

2

CONNECTOR

 

 

 

 

 

 

 

 

 

TAN

TAN

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

120 VOLTS AC 2 WIRE 120/208 VOLTS AC OR 120/240 VOLTS AC

3 WIRE

27202.0000B 5/96 © 1996 BUNN-O-MATIC CORPORATION

Page 42

27118 100400

 

 

SCHEMATIC WIRING DIAGRAM

 

L1

SINGLE BREWER W/ SERVER SENSOR

L2 N

 

 

 

 

 

 

 

 

 

 

 

GRN

 

 

LIMIT THERMOSTAT

 

BLK-12

TANK HEATER

RED-12

 

RED-12 (208 OR 240V)

BLK-12

 

BLK-12

 

WHI-12 (120V)

 

 

 

 

K1

 

 

 

 

K1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N.O.

READY INDICATOR

N.O.

 

 

 

 

 

 

OVERFLOW

 

SW. & THERMOSTAT

 

 

 

 

 

 

 

PROTECTION SW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BLK

 

RED

RED

BLU

 

 

 

BLK

K1

 

 

 

WHI

 

 

N.C.

 

 

 

 

 

 

 

 

 

REFILL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LIQUID

1

VIO

SOL

WHI

 

 

 

 

 

 

 

 

 

BLU

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

LEVEL

 

 

WHI

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

BOARD

PIN-20

 

 

 

 

 

 

 

 

 

 

 

4

PROBE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BLK

 

 

 

 

 

 

 

WHI

 

 

 

 

WHI

3-SET SELECTOR SWITCH WITH

 

 

 

 

 

 

START SW.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GRINDER INTERFACE OPTION

 

 

BLK

 

 

 

WHI/VIO

 

 

 

 

 

 

TAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GRY

 

1/4 BATCH

 

 

1

 

WHI/VIO

WHI/VIO

GRY

1

TAN

 

 

FRACTIONAL BATCHES

 

1/3 BATCH

 

BREW

 

WHI

WHI

WHI

GRN

 

 

 

 

2

 

2

 

 

(CONNECT

 

1/2 BATCH

 

 

PNK

 

 

ORA

 

 

AS REQUIRED)

 

2/3 BATCH

 

TIMER

3

 

 

 

3

SERVER

 

 

 

 

WHI/GRN

 

 

YEL

 

FULL BATCH

 

3/4 BATCH

 

 

4

 

 

4

SENSOR

 

(NO CONNECTION)

PNK

 

 

WHI/YEL

 

 

PNK

 

 

BATCH COMMON

 

 

5

 

 

5

 

 

 

 

 

 

 

 

 

 

 

BLU

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BYPASS

 

 

 

 

 

 

 

 

S

WHI/VIO

 

 

 

SOL

 

WHI/GRN

WHI/GRN

 

 

 

 

 

 

 

 

 

WHI/VIO

 

 

 

 

 

 

 

 

 

 

 

 

E

WHI/RED

 

 

 

 

 

 

 

WHI/RED

SOL

 

L

 

 

 

 

 

 

 

 

YEL

 

 

YEL

 

 

 

 

 

 

 

E

 

 

 

 

 

 

 

 

 

 

ORA

 

 

ORA

 

 

 

 

 

 

DISPENSE

C

 

 

 

 

 

 

 

 

T

WHI/ORA

 

 

WHI/ORA

 

 

 

 

 

 

 

 

O

 

 

 

 

 

 

 

 

 

 

 

 

 

R

 

 

 

 

 

 

 

 

 

 

 

 

 

S

W

 

 

 

 

 

 

 

 

 

GRY

 

GRY

4

GRINDER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

INTERFACE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PNK

PNK

2

CONNECTOR

 

 

 

 

 

 

 

 

 

TAN

TAN

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

120 VOLTS AC 2 WIRE 120/208 VOLTS AC OR 120/240 VOLTS AC

3 WIRE

27202.0001B 5/96 © 1996 BUNN-O-MATIC CORPORATION

Page 43

27118 100400

 

SCHEMATIC WIRING DIAGRAM

SINGLE BREWER ECA-ATF & BTF W/ SERVER SENSOR

L1

GRN/YEL

 

L2

 

 

 

 

 

 

LIMIT

 

 

 

 

 

 

 

 

 

 

 

 

THERMOSTAT

 

TANK HEATER

 

 

 

 

 

 

 

 

RED-12

BLK-12

BLK-12

W

 

BLU-12

 

 

 

 

 

 

W

 

 

 

TAN

 

 

 

 

 

 

 

t° H

 

 

 

 

 

 

 

 

 

 

 

 

 

BLU

 

 

 

 

 

 

 

H

I

 

 

7

 

 

 

 

 

 

 

I

 

 

 

WHI/BRN

 

 

 

 

 

 

 

 

 

TANK HEATER

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

READY

 

PNK

PNK

 

SW

 

PNK 20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L.E.D.

 

GRY

GRY

 

 

 

(PROBE)

 

 

 

 

 

 

 

INTERLOCK

GRY

 

 

5

 

 

 

 

RED

 

 

 

GRY

 

 

 

 

 

 

 

 

 

ASSY

 

 

 

 

 

 

 

 

 

ORA

 

 

4

BLK

 

 

 

 

 

 

 

 

 

ELECTRONIC

3

 

 

REFILL

 

 

 

 

 

 

GRN

 

 

 

 

 

 

 

WHI/YEL

 

 

 

 

 

 

 

2

WHI/BLU

 

RED

 

OVERFLOW

 

 

 

CONTROL ASSY

 

 

SOL

 

 

 

 

 

1

 

 

 

 

 

PROTECTION SW

 

 

 

 

 

 

 

 

 

 

BLK

RED

RED

 

 

 

 

 

 

 

 

 

 

N.C.

 

 

 

 

 

 

WHI/YEL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BLK

 

 

 

 

 

RED

 

 

 

 

 

RED

 

 

 

 

 

 

 

 

START SW.

 

 

 

 

 

TAN

 

BLK

 

WHI/VIO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GRY

 

1/4 BATCH

 

1

WHI/VIO

 

WHI/VIO

GRY

1

TAN

 

 

 

 

 

RED

 

RED

RED

GRN

 

 

FRACTIONAL BATCHES

 

1/3 BATCH

BREW

2

 

2

 

 

(CONNECT

 

1/2 BATCH

PNK

 

 

 

ORA

 

 

AS REQUIRED)

 

2/3 BATCH

TIMER 3

 

 

 

3

SERVER

 

 

 

WHI/GRN

 

 

 

YEL

 

FULL BATCH

 

3/4 BATCH

 

4

 

 

 

4

SENSOR

 

(NO CONNECTION)

PNK

 

WHI/YEL

 

 

 

PNK

 

 

BATCH COMMON

 

5

 

 

 

5

 

 

 

 

 

 

 

 

 

 

BLU

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

BYPASS

S

WHI/VIO

SOL

WHI/GRN

WHI/GRN

 

 

 

WHI/VIO

 

 

 

 

 

E

WHI/RED

 

 

WHI/RED

SOL

L

 

 

YEL

YEL

 

 

E

 

 

 

ORA

ORA

 

 

DISPENSE

C

 

 

WHI/ORA

 

 

 

T

 

 

 

 

O

 

 

 

 

 

R

 

 

 

 

 

S

W

 

 

 

 

 

 

 

 

 

GRY

 

GRY

4

GRINDER

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

INTERFACE

 

200-240 VOLTS AC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PNK

PNK

2

CONNECTOR

 

 

 

 

 

 

 

 

 

 

 

 

 

TAN

 

TAN

1

 

 

2 WIRE

 

27202.0002B 5/96 © 1996 BUNN-O-MATIC CORPORATION

Page 44

27118 100400

 

LIMIT THERMOSTAT

 

 

OVERFLOW

 

SW. & THERMOSTAT

 

 

 

 

 

 

 

 

 

 

 

 

PROTECTION SW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BLK

 

RED

RED

 

BLU

 

 

 

 

 

 

 

 

 

 

 

RED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VIO

 

 

 

RED

 

 

 

 

 

 

 

 

LIQUID

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LEVEL

 

 

 

 

 

 

RED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BOARD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PIN-20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

PROBE

 

 

 

 

 

 

 

 

200-240 VOLTS AC

3 WIRE

27202.0003B 5/96 © 1996 BUNN-O-MATIC CORPORATION

Page 45