Bunn TU5Q User Manual

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BUNN

TU5Q

OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

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

www.bunnomatic.com

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CONTENTS

Introduction ............................................................. 2

Warranty .................................................................. 2

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

Electrical Requirements ........................................... 4

Plumbing Requirements .......................................... 4

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

Operating Controls................................................... 6

Cleaning................................................................... 6

Tea Brewing ............................................................. 6

Troubleshooting ....................................................... 7

Service................................................................... 12

Wiring Diagrams.................................................... 23

INTRODUCTION

This equipment will brew a three or five-gallon batch of fresh tea into an awaiting dispenser. The tea will be dispensed at approximately room temperature to conserve ice. The brewer is only for indoor use on a sturdy counter or shelf and requires a minimium of 40 inches of clearance above the counter.

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 mate-

rial and workmanship for two years from the date of installation.

3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever comes first.

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

THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of Bunn are

not authorized to make modifications to this warranty or to make additional warranties that are binding on Bunn. Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and should not be relied upon.

The Buyer shall give Bunn prompt notice of any claim to be made under this warranty by telephone at (217) 529-6601 or by writing to Post Office Box 3227, Springfield, Illinois, 62708-3227. If requested by Bunn, the Buyer shall ship the defective equipment prepaid to an authorized Bunn service location. If Bunn determines, in its sole discretion, that the equipment does not conform to the warranty, Bunn shall repair the equipment with no charge for parts during the warranty period and no charge for labor by a Bunn Authorized Service Representative during the warranty period. If Bunn determines that repair is not feasible, Bunn shall, at its sole option, replace the equipment or refund the purchase price for the equipment.

THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AS SPECIFIED HEREIN, TO REPAIR OR, AT BUNN’S SOLE OPTION, REPLACEMENT OR REFUND.

In no event shall Bunn be liable for any other damage or loss, including, but not limited to, lost profits, lost sales, loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute equipment, facilities or services, or any other special, incidental or consequential damages.

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#00831.0000

#00656.0000

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ELECTRICAL REQUIREMENTS

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

The brewer requires either 2-wire, grounded service rated 120 volts ac, or 3-wire, grounded service rated 120/208 or 120/240 volts ac, 20 amp, single phase, 60 Hz. Refer to the product's dataplate above the dilution nozzle for actual voltage of your particular brewer model.

Electrical Hook-Up CAUTION – Improper electrical installation will damage electronic components.

1. An electrician must provide electrical service as specified.

2. Remove top lid and rotate the control thermostat knob fully counterclockwise to the "OFF" position and

replace top lid.

3. Remove the lower rear panel, feed the cord through the strain relief at the rear of the brewer and connect it to

the terminal block.

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

5. Connect the brewer to the power source and verify voltage at the terminal block.

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

WARNING - The brewer must be electrically grounded using the green screw near the terminal block. Do not

assume a plumbing line will provide an adequate ground.

Initial Set-Up.

PLUMBING REQUIREMENTS

The brewer must be connected to a cold water system with operating pressure between 30 and 90 psi(207 and 621 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(621 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).

1. Attach the female fitting from the short piece of tubing on the strainer/flow control (supplied) to the water

inlet fitting at the rear of the brewer.

2. Flush the water line and securely attach it to the flare fitting on the strainer/flow control.

3. Turn on the water supply.

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INITIAL SET-UP

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

Initial Set-Up

, except

when specified in the instructions.

1. Remove the top lid from the brewer.

2. Rotate the control thermostat knob fully counterclockwise to the "OFF" position. Set the three-gallon timer knob at 4 minutes, the five-gallon timer knob at 6 3/4 minutes, and replace the top lid.

3. Insert an empty funnel into the funnel rails.

4. Place an empty dispenser on the brewer base.

5. Connect the brewer to the power source. Place the On/Off switch in the lighted "ON" position, the dilution switch in the "NO DILUTION" position, the batch selector in the 'FIVE GALLON" position, and momentarily press the start switch. Water will flow into the tank for approximately 6 3/4 minutes. Press the start switch again to initiate a second cycle. When the second cycle stops, press the start switch once more. During the third cycle, the tank will fill to its capacity and the excess will flow from the funnel into the dispenser. Empty the dispenser when the flow of water from the funnel stops.

6. Place the dilution switch in the "DILUTION" position and press the start switch to begin another brew cycle. When the flow of water stops, measure the total water volume from the dispenser. It should be approximately 5 gallons and 15 ounces. (655 ounces.)

7. If not, disconnect the brewer from the power source, remove the top lid, and adjust the five gallon timer knob up or down, as required.

8. Replace the top lid, connect the brewer to the power source, start, and measure another cycle.

9. Repeat steps 6-8 until the recommended total water volume (655 ounces) is achieved.

10. Place the batch selector in the 'THREE GALLON" position and press the start switch to begin another brew cycle. When the flow of water stops, measure the total water volume from the dispenser. It should be approximately 3 gallons and 9 ounces. (393 ounces)

11. If not, disconnect the brewer from the power source, remove the top lid, and adjust the three gallon timer knob up or down, as required.

12. Replace the top lid, connect the brewer to the power source, start, and measure another cycle.

13. Repeat steps 10-12 until the recommended total water volume (393 ounces) is achieved.

14. The concentrate is pre-adjusted to deliver the correct ratio of water over the funnel to dilution water.

15. Disconnect the brewer from the power source, remove the top lid, rotate the control thermostat knob fully clockwise to the "ON" position and replace the top lid.

16. Empty the dispenser.

17. Connect the brewer to the power source and wait for the water in the tank to heat to brewing temperature (approximately 20 minutes). Some water will drip from the funnel during this time; this is due to expansion and should not occur thereafter.

18. Begin another brew cycle. Empty the reservoir after water has stopped flowing from the funnel.

19. Allow the water in the tank to heat to the proper temperature.

20. The brewer is now ready to brew approximately 3 or 5 gallons of freshly brewed room temperature tea using approximately 1 ounce of loose leaves per gallon of finished iced tea.

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OPERATING CONTROLS

A. Lighted ON/OFF Switch ON - Placing the switch in the lighted upper position allows the start switch to activate a timed brew cycle. OFF - Placing the switch in the lower position stops the brew cycle. Stopping a brew cycle after it has been started will not stop the flow of water into the funnel until the tank syphons down to its proper level. The switch should always be placed in this position after a brew cycle and whenever the brewer is unattended.

B. Dilution/No Dilution Selector Switch Dilution - Placing the switch in the upper position produces fully diluted iced tea from the brew cycle. No Dilution - Placing the switch in the lower position produces only tea concentrate that will need to be diluted

in another manner before it is ready to serve.

C. 3-Gallon/5-Gallon Selector Switch 3-Gallon - Placing the switch in the upper position produces three gallons of iced tea (set on "DILUTION") or 76 oz. of iced tea concentrate (set on "NO DILUTION") from the brew cycle. 5-Gallon - Placing the switch in the lower position produces five gallons of iced tea (set on "DILUTION") or 126 oz. of iced tea concentrate (set on "NO DILUTION") from the brew cycle.

D. Start Switch Starts a brew cycle when the ON/OFF switch is in the "ON" position.

CLEANING

CAUTION - CLEAN AND SANITIZE YOUR ICED TEA BREWER DAILY

1. Remove and thoroughly clean the entire brew funnel. The funnel tip and screen must be free from any tea particles or residue. Reassemble the funnel.

2. Unplug the brewer. Remove and thoroughly rinse the sprayhead. The holes must be open and clear of any mineral deposits. Wipe the sprayhead panel clean with a damp cloth.

3. Insert the deliming spring into the sprayhead fitting until no more than one inch is visible and move it in and out 5 or 6 times. Reattach the sprayhead.

4. Wash the entire outside surface of the brewer with a clean damp cloth.

CAUTION - DO NOT KEEP BREWED ICED TEA OVERNIGHT. THE SERVER MUST BE CLEANED DAILY.

TEA BREWING

1. Begin each brew cycle with a clean empty brew funnel and server. (Be sure the server lid doesn’t interfere with the flow of dilution water.)

2. Insert a BUNN® filter into the funnel.

3. Pour the packet of loose fresh tea leaves into the filter. Approximately one ounce is recommended for each gallon of finished beverage.

4. Level the bed of tea leaves by gently shaking.

5. Slide the funnel into the funnel rails until it stops.

6. Place the ON/OFF switch in the “ON” position.

7. Place the batch selector switch in the desired position.

8. Place the dilution switch in the desired position.

9. Momentarily press the start switch.

CAUTION - The funnel contains hot liquids. Remove funnel slowly.

10. Carefully remove the brew funnel and discard the used filter when tea no longer drips from the funnel tip.

11. Place the ON/OFF switch in the "OFF" position to prevent a false start.

12. Fresh tea is available at the faucet.

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TROUBLESHOOTING

A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic Technical Service Department.

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

nel.

• All electronic components have 120 volt ac and low voltage dc potential on their terminals. Shorting of

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

• Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. If an

intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a

terminal or crimp.

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

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

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

help to avoid twists and kinks in the tubing.

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

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

WARNING –

• Exercise extreme caution when servicing electrical equipment.

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

• Follow recommended service procedures

• Replace all protective shields or safety notices

Problem

Brew cycle will not start

Probable Cause

1. No water

2. No power or incorrect voltage to the brewer

3. External Strainer/Flow Control (.750 GPM)

4. ON/OFF Switch

5. Start Switch

Remedy

Water lines and valves to the brewer must be open.

Check circuit breakers or fuses.

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

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

Refer to

Service

- ON/OFF Switch

for testing. See page 20

Refer to

Service

- Start Switch for

testing procedures. See page 21

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TROUBLESHOOTING (cont.)

PROBLEM

Brew cycle will not start (cont.)

Water is not hot

PROBABLE CAUSE

6. Brew Timer

7. Brew Solenoid Valve

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

2. Control Thermostat

3. Tank Heater

REMEDY

Refer to

Service

- Brew Timer for

testing procedures. See page 15

Refer to

Service

- Brew Solenoid Valve for testing procedures. See page 14

Refer to

Service

- Limit Thermostat

for testing procedures. See page 19

Refer to

Service

- Control Thermostat for testing procedures. See page 16

Refer to

Service

- Tank Heater for

testing procedures. See page 22

Dilution cycle will not start

1. ON/OFF Switch

2. Start Switch

3. Dilution Switch

Refer to

Service

- ON/OFF Switch for testing procedures. See page 20

Refer to

Service

- Start Switch for

testing procedures. See page 21

Refer to

Service -

Dilution Switch

for testing procedures. See page 18

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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY

Inconsistent beverage level in dispenser

Consistently high or low beverage level in the dispenser

1. Syphon System

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

3. Water Pressure

1. External Strainer/Flow Control (.750 GPM)

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

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

The water pressure to the brewer must be at least 20 psi(138 kPa).

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

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

Spitting or excessive steaming

Drip-out time too long

1. 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.

2. Control Thermostat

1. Funnel Tip

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

Refer to

Service

- Control Thermostat for testing procedures. See page 16

The brew funnel should be cleaned thoroughly before each brew cycle to lessen the chance of tea leaf particles clogging the drip-out tip.

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TROUBLESHOOTING (cont.) PROBLEM

Dripping from sprayhead

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

PROBABLE CAUSE

1. Syphon System

3. Brew Solenoid Valve

1. Brew Timer

REMEDY

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

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

Refer to

Service

- Brew Solenoid Valve for testing procedures. See page 14

Refer to

Service

- Brew Timer for

testing procedures. See page 15

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

Beverage overflows dispenser

Weak beverage

1. Brew Solenoid Valve

1. Dispenser

2. Brew Timer

3. Brew Solenoid Valve

1. Filter Type

2. Tea

Refer to Service - Brew Solenoid Valve for testing procedures. See page 14

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

Refer to

Service -

Brew Timer for

testing procedures. See page 15

Remove the Brew Solenoid Valve and clean any obstruction. Rebuild or replace the valve if necessary. See page 14

BUNN® paper filters must be used for proper extraction.

A sufficient quantity of fresh, loose tea leaves should be used for proper extraction.

3. Sprayhead

Page 10

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

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TROUBLESHOOTING (cont.) PROBLEM

Weak beverage (cont.)

PROBABLE CAUSE

4. Funnel Loading

5. Water Temperature

6. Low Brew Water Volume

REMEDY

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

Place an empty funnel on an empty dispenser beneath the sprayhead. Initiate a brew cycle and check the water temperature immediately below the sprayhead with a thermometer. The reading should not be less

than 200°F. Adjust the control ther-

mostat to increase the water temperature. Replace if necessary.

Adjust needle valve to achieve 76 oz. water from the sprayhead when the batch size setting is at three gallons. To increase volume, turn counter-clockwise. To decrease volume, turn clockwise.

Dry tea leaves remain in the funnel

Brewer is making unusal noises

1. Funnel Loading

1. Solenoid(s)

2. Plumbing Lines

3. Water Supply

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

The nut on the solenoid(s) 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 exceed 90 psi(621 kPa). Install a regulator if necessary to lower the working pressure to approximately 50 psi(345 kPa).

4. Tank Heater

Page 11

Remove and clean lime off the tank heater. See page 22

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SERVICE

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

Troubleshooting

cause of any problem.

WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel. The brewer should be disconnected from the power source 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 and rear inspection panel.

for assistance in determining the

The top cover is attached with four #6-32 screws. Removal of the top cover will allow access to ON/OFF switch, start switch, batch selector switch, dilution switch, brew timer, control thermostat, limit thermostat and tank heater.

The rear inspection panel is attached with six #832 screws. Removal of the rear panel will allow access to the brew solenoid, dilution solenoid and terminal block.

FIG. 1 COMPONENT ACCESS

P2131.40

Contents

Batch Selector Switch .......................................... 13

Brew Solenoid Valve ............................................ 14

Brew Timer .......................................................... 15

Control Thermostat.............................................. 16

Dilution Solenoid Valve ........................................ 17

Dilution Switch .................................................... 18

Limit Thermostat ................................................. 19

ON/OFF Switch..................................................... 20

Start Switch ......................................................... 21

Tank Heater .......................................................... 22

Wiring Diagram ................................................... 23

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SERVICE (cont.)

BATCH SELECTOR SWITCH

P2131.40

FIG. 2 BATCH SELECTOR SWITCH

Location:

The batch selector switch is located in the front of the hood, above and to the right of the brew funnel. It is the second switch from the right.

Testing Procedures:

1. Disconnect the brewer from the power source.

2. Remove the wires from all terminals.

3. Select the 3-gallon setting.

4. Check for continuity between the terminals where

the orange and green wires connect to the switch.

Continuity should be present across these termi-

nals.

5. Select the 5-gallon setting.

6. Check for continuity between the terminals where the orange and yellow wires connect to the switch. Continuity should be present.

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 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 the switch captive in the hood.

4. Refer to Fig. 3 when reconnecting the wires.

YEL to 5-Gal Timer Dial

ORA to Timer Board

GRN to 3-Gal Timer Dial

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

P2144

FIG. 3 BATCH SELECTOR SWITCH

TERMINALS

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SERVICE (cont.)

MINUTES

MINUT

BUNN-O-MA

TIC

P/N 05791-0006 120 VAC

6 7

BREW SOLENOID VALVE

P2146.35

FIG. 4 BREW SOLENOID VALVE

Location:

The brew solenoid is located inside the upper rear access panel, on the left side of the bracket when looking at it from the rear of the brewer . Test Procedures:

1. Disconnect the brewer from the power source.

2. Disconnect the white/violet and white/green wires

from the solenoid valve. With the ON/OFF switch

in the "ON" position press the start switch.

3. With a voltmeter, check the voltage across the

white/violet and white/green wires. Connect the

brewer to the power source. The indication must

be:

a) 120 volts ac for 2-wire 120 volt models.

b) 120 volts ac for 3-wire 120/208 and 120/240

volt models.

4. Disconnect the brewer from the power source.

If continuity is present as described, reconnect the white/violet from the brew timer and white/green wire from the brew timer. 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. With ON/OFF switch in the "ON" position press start switch and listen carefully in the vicinity of the solenoid valve for a "clicking" sound as the coil magnet attracts.

7. Disconnect the brewer from the power source.

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 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 solenoid valve.

2. Turn off the water supply to the brewer.

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

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

5. Securely install the new solenoid valve to the bracket.

6. Securely fasten the water lines to and from the solenoid valve.

7. Refer to the Fig. 5 when reconnecting the wires.

WHI/GRN to Brew Timer TL4 WHI/GRN to Dilution Solenoid

If voltage is present as described, proceed to #5 If voltage is not present as described, refer to

Diagram

and check brewer wiring harness.

Wiring

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

Page 14

WHI/VIO to Brew Timer TL1

P1799

FIG. 5 SOLENOID VALVE TERMINALS

10777 041500

Page 15

BUNN-O-MATIC

P/N 05791-0006 120 VAC

MINUTES

Page 15

Page 16

SERVICE (cont.)

BUNN-O

-MATIC

P/N 05791-0006 120 VAC

BUNN

OFF

BUNN

OFF

CONTROL THERMOSTAT

VAC

BUNN-O-MATIC

P/N 05791-0006 120

MINUTES

P2143.35

FIG. 8 CONTROL THERMOSTAT

Location:

The control thermostat is located inside hood on

the right side.

Test Procedures:

1. Disconnect the brewer from the power source.

2. Locate the blue/black wire on the control thermostat.

3. With a voltmeter, check the voltage across the blue wire on the control thermostat and the white or red wire on the tank heater. Connect the brewer to the power source. The indication must be: a) 120 volts ac for 2-wire 120 volt models. b) 208 volts ac for 3-wire 120/208 volt models. c) 240 volts ac for 3-wire 120/240 volt models.

4. Disconnect the brewer from the power source.

a) 120 volts ac for 2-wire 120 volt models. b) 208 volts ac for 3-wire 120/208 volt models. c) 240 volts ac for 3-wire 120/240 volt models.

8. Disconnect the brewer from the power source.

If voltage is present as described, reinstall the capillary tube into the tank to the line 5.5" above the bulb, the control thermostat is operating properly. If voltage is not present as described, replace the thermostat.

Removal and Replacement:

1. Remove both wires from the control thermostat terminals.

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 screw holding the control thermostat to its bracket.

4. Slide the grommet to the line 5.5" 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 a vertical position.

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

7. Fasten the new control thermostat to its bracket.

8. Refer to Fig. 9 when reconnecting the wires.

9. Adjust the control thermostat as required.

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 wire on the control thermostat.

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

7. With a voltmeter, check the voltage across the black wire of the control thermostat and the white or red wire on the tank heater when the control thermostat is turned fully clockwise. Connect the brewer to the power source. The indication must be:

Page 16

BLK to Tank Heater

BLU to Limit Thermostat

P2090.80

FIG. 9 CONTROL THERMOSTAT TERMINALS

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SERVICE (cont.)

MINUTES

UNN-O-MATIC

05791-0006 120 VAC

6 7

DILUTION SOLENOID VALVE

P2146.35

FIG. 10 DILUTION SOLENOID VALVE

Location:

The dilution solenoid valve is located behind the upper rear access panel on the right side of the bracket, when looking at it from the rear of the brewer.

Test Procedures:

1. Disconnect the brewer from the power source.

2. Place Dilution switch in "DILUTION" position.

3. Disconnect the white/blue and white/green wires

from the solenoid valve. With the ON/OFF switch

in the "ON" position press the start switch.

4. With a voltmeter, check the voltage across the

white/blue and white/green wires. Connect the

brewer to the power source. The indication must

be:

a) 120 volts ac for 2-wire 120 volt models.

b) 120 volts ac for 3-wire 120/208 and 120/240

volt models.

4. Disconnect the brewer from the power source.

If continuity is present as described, reconnect the white/blue wire from the dilution switch and white/ green wire from the brew solenoid terminal. If continuity is not present as described, replace the solenoid valve.

7. Disconnect the brewer from the power source.

Removal and Replacement:

1. Remove all wires from solenoid valve.

2. Turn off the water supply to the brewer.

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

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

5. Securely install the new solenoid valve to the bracket.

6. Securely fasten the water lines to and from the solenoid valve.

7. Refer to FIG. 11 when reconnecting the wires.

WHI/BLU to Dilution Switch

If voltage is present as described, proceed to #5. If voltage is not present as described, refer to

Wiring Diagram

and check brewer wiring harness.

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

WHI/GRN to Brew Solenoid Valve

P1799

FIG. 11 SOLENOID VALVE TERMINALS

Page 17

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SERVICE (cont.)

DILUTION SWITCH

P2131.40

FIG. 12 DILUTION SWITCH

Location:

The dilution switch is located in the front of the hood, above and to the left of the brew funnel, and right of the ON/OFF switch. It is the second switch from the left

5. Set Dilution switch to "NO DILUTION".

6. Check for continuity between the terminals where the white/blue and white/violet connect to the switch. Continuity should not be present.

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 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 the switch captive in the hood.

4. Refer to Fig. 13 when reconnecting the wires.

Test Procedures:

1. Disconnect the brewer from the power source.

2. Remove the wires from all terminals.

3. Set Dilution switch to "DILUTION".

4. Check for continuity between the terminals where the white/blue and white/violet wires connect to the switch. Continuity should be present.

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

WHI/BLU to Dilution Solenoid Valve

WHI/VIO to ON/OFF Switch

P2144

FIG. 13 DILUTION SWITCH

TERMINALS

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SERVICE (cont.)

MINUT

P/N 05791-0006 120 VAC

LIMIT THERMOSTAT

FIG. 14 LIMIT THERMOSTAT

BUNN-O-MATIC

P/N 05791-0006 120 VAC

MINUTES

white or red wire on the tank heater terminal. Connect the brewer to the power source. The indication must be: a) 120 volts ac for 2-wire 120 volt models. b) 208 volts ac for 3-wire 120/208 volt models. c) 240 volts ac for 3-wire 120/240 volt models.

6. Disconnect the brewer from the power source.

If voltage is present as described, reconnect the blue wire to the limit thermostat. The limit thermostat is

MINUTES

operating properly. If voltage is not present as described, replace the limit thermostat.

Removal and Replacement

1. Remove both wires from the limit thermostat terminals.

2. Carefully slide the limit thermostat out from under the retaining clip.

3. Carefully slide the new limit thermostat into the retaining clip.

P2143.35

4. Refer to Fig. 15 when reconnecting the wires.

Location: The limit thermostat is located inside the hood on the tank lid.

Test Procedure:

1. Disconnect the brewer from the power source and remove the black wire from the limit thermostat.

2. With a voltmeter, check the voltage across the black wire removed from the limit thermostat and the white or red wire on the tank heater terminal. Connect the brewer to the power source. The indication must be: a) 120 volts ac for 2-wire 120 volt models. b) 208 volts ac for 3-wire 120/208 volt models. c) 240 volts ac for 3-wire 120/240 volt models.

3. Disconnect the brewer from the power source.

If voltage is present as described, reconnect the black wire and proceed to #4. If voltage is not present as described, refer to the Wiring Diagrams and check the wiring harness.

BLU to Control Thermostat

BLK to Terminal Block

P1800

FIG. 15 LIMIT THERMOSTAT TERMINALS

4. Remove the blue wire from the limit thermostat.

5. With a voltmeter, check the voltage across the exposed terminal of the limit thermostat and the

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SERVICE (cont.) ON/OFF SWITCH

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 wiring harness.

6. Check for continuity across the center and end terminals of the bottom row when the switch is in the “ON” position.

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

Removal and Replacement:

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 the switch captive in the hood.

4. Refer to FIG. 17 when reconnecting the wires.

FIG. 16 ON/OFF SWITCH

P2131.40

Location: The ON/OFF switch is located in the front of the hood, above and to the left of the brew funnel.

Test Procedure:

1. Disconnect the brewer from the power source.

2. Remove the black and white/violet wires from the switch terminals.

3. With a voltmeter, check the voltage across the black wire removed from the ON/OFF switch and the white wire on the switch terminal.

4. Connect the brewer to the power source.The indication must be: a) 120 volts ac for 2-wire 120 volt models. b) 120 volts ac for 3-wire 120/208 and 120/240 volt models.

WHI to Timer Board TL2

BLK to Terminal Block

WHI/VIO to Dilution Switch WHI/VIO to Timer Board TL1

P1590

FIG.17 ON/OFF SWITCH TERMINALS

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SERVICE (cont.) START SWITCH

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 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 the switch captive in the hood.

4. Refer to Fig. 19 when reconnecting the wires.

FIG. 18 START SWITCH

P2131.40

Location: The start switch is located in the front of the hood, above and to the right of the brew funnel.

Test Procedure:

1. Disconnect the brewer from the power source.

2. Remove the wires from all terminals.

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

WHI/YEL to Timer Board TL5

WHI/ORA to Timer Board TL3

P2091

FIG. 19 START SWITCH TERMINALS

Page 21

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SERVICE (cont.)

BUNN-O-MATIC

TANK HEATER

BUNN-O-MATIC

P/N 05791-0006 120 VAC

MINUTES

P2143.35

FIG. 20 TANK HEATER

Location:

The tank heater is located inside the tank and se-

cured to the tank lid.

Test Procedures:

1. Disconnect the brewer from the power supply.

2. With a voltmeter, check the voltage across the black and white or red wires. Connect the brewer to the power source. The indication must be: a) 120 volts ac for 2-wire 120 volt models. b) 208 volts ac for 3-wire 120/208 volt models. c) 240 volts ac for 3-wire 120/240 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 Diagram

and check wiring harness.

4. Disconnect the black wire and the white or red wire from the tank heater terminals.

5. Check for continuity across the tank heater terminals.

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. NOTE- If the tank heater remains unable to heat, re-

move and inspect heater for cracks in the sheath.

Removal and Replacement:

1. Disconnect the black wire and the white or red wire from the tank heater terminals.

2. Remove sprayhead and the hex nut securing the sprayhead tube to the hood. Set aside for reassembly.

3. Disconnect vent tube and water inlet tube.

4. Remove the eight #8 keps nuts securing the tank lid to the tank.

5. Remove the tank lid with limit thermostat, sprayhead tube, tank heater and vent tube.

6. Remove the two hex nuts securing the tank heater to the tank lid. Remove tank heater with gaskets and discard.

7. Install new tank heater with gaskets on the tank lid and secure with two hex nuts.

8. Install tank lid with limit thermostat, sprayhead tube, tank heater and vent tube using eight #8 keps nuts.

9. Secure sprayhead tube to hood using a hex nut.

10. Install sprayhead.

11. Connect vent tube and water inlet tube to fitting.

12. Reconnect the wires to the limit thermostat and tank heater. See limit thermostat section in this manual when reconnecting wires.

13. Refer to Fig. 21 when reconnecting the tank heater wires.

BLK to Control Thermostat

WHI to Terminal Block (120V) RED to Terminal Block (208&240V)

Page 22

FIG. 21 TANK HEATER TERMINALS

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P1284.80

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