Bunn Coffee Maker TWF-EZ Installation Manual

BUNN

TWF-EZ

OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

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

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

Adjustments and Optional Settings........................... 7

Troubleshooting ........................................................ 8

Diagnostic Chart ..................................................... 14

Service.................................................................... 15

Wiring Schematic ................................................... 26

INTRODUCTION

This equipment will brew a half-gallon batch of hot coffee into an airpot server or dispenser and a three-gallon batch of fresh tea into a dispenser and dispense at approximately room temperature to conserve ice. The brewer 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 work-

manship for two years from the date of installation.

2.) Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material and

workmanship for two years from the date of installation.

3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory screen

sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever comes first.

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

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

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

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

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

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

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USER NOTICES

Carefully read and follow all notices on the equipment and in this manual. They were written for your protec-

tion. All notices on the equipment should be kept in good condition. Replace any unreadable or damaged labels.

#00831.0000

#00656.0000

#03408.0000

#03409.0000

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ELECTRICAL REQUIREMENTS

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

120V model brewers require 2-wire, grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz.

Proceed as follows:

Electrical Hook-Up

CAUTION – Improper electrical installation will damage electronic components.

1. An electrician must provide electrical service as specified.

2. Connect the brewer to the power source.

3. Using a voltmeter, check the voltage at the electrical source.

4. 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

Initial Set-Up.

PLUMBING REQUIREMENTS

These brewers must be connected to a cold water system with operating pressure between 20 (138) and 90 (620 kPa) psi from a 1⁄2" or larger supply line. A shut-off valve should be installed in the line before the brewer. Install a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345 kPa). The water inlet fitting is 1⁄4" flare.

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

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

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

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

1. Remove the shipping caps from the bulkhead fit-

tings on the rear of the brewer.

2. Attach the flare fitting from the short piece of tub-

ing on the tee and strainer/flow control (supplied)

to the water inlet fittings at the rear of the brewer.

3. Flush the water line and securely attach it to the

flare fitting on the tee.

4. Turn on the water supply.

5. Place an empty vessel beneath the faucet and lift

the handle until water is dispensed.

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P1392

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INITIAL SET-UP

1. Insert the funnel (empty) into the funnel rails.

2. Place an empty tea dispenser on the brewer base. Be prepared to empty the dispenser a few times.

3. Plug in the brewer, place the TEA/OFF/COFFEE switch in the “COFFEE” position, and momentarily press the start switch. When the flow of water into the tank stops, press the start switch to initiate a second cycle. Wait until the flow of water stops and start a third cycle. During the third cycle, the tank will fill to its capacity and the excess will flow from the funnel into the dispenser. The tank heater will come on automatically. Empty the dispenser when the third cycle stops. Allow the tank to heat (approximately 15 to 20 minutes). Some water will drip from the funnel during this time; this is due to expansion and will not occur thereafter. Empty the dispenser.

4. Place the TEA/OFF/COFFEE switch in the “TEA” position and begin another brew cycle.

5. Measure the total water volume from the dispenser. It should be approximately (396 ounces.)

6. If not, see

7. Repeat steps 5 & 6 until the recommended total water volume (396 ounces) is achieved.

8. The concentrate valve is preadjusted to deliver the correct ratio of brew water to dilution water.

9. Empty the dispenser.

10. Place the TEA/OFF/COFFEE switch in the “COFFEE” position and begin another brew cycle.

11. Measure the total water volume from the dispenser. It should be approximately 64 ounces.

12. If not, see

13. Repeat steps 11 & 12 until the recommended total water volume (64 ounces) is achieved.

14. The brewer is now ready to brew approximately one-half gallon of hot coffee or 3-gallons of freshly brewed room temperature tea.

Adjustments and Optional Settings

on page 7 to increase or decrease volumes.

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OPERATING CONTROLS

A. TEA/OFF/COFFEE Switch

TEA- Placing the switch in the full left position allows the start switch to activate a timed brew cycle for a 0.5 gallon

of tea concentrate and 2.5 gallons of dillution water into the dispenser.

COFFEE- Placing the switch in the full right position allows the start switch to activate a timed brew cycle for a 0.5 gallon of coffee into the dispenser.

OFF - Placing the switch in the center 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. Start Switch Starts a brew cycle when the

TEA/OFF/COFFEE switch is in the "TEA" or "COFFEE" position.

C. Ready Indicator This indicator glows when preselected brew water temperature has been achieved. It is also used for diagnostic testing.

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. Place the TEA/OFF/COFFEE switch in the "OFF" position. 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 two inches is visible and move it in and out 5 or 6 times. Insert the spring into the air vent hole in the sprayhead panel 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.

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 or coffee into the filter. Approximately four ounces is recommended for tea.

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

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

6. Place the TEA/OFF/COFFEE switch in the "TEA" or "COFFEE" position.

7. Momentarily press the start switch.

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

8. Carefully discard the used filter when beverage no longer drips from the funnel tip.

9. Place the TEA/OFF/COFFEE switch in the "OFF" position to prevent a false start.

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TWF-EZ ADJUSTMENTS & OPTIONAL SETTINGS

3. Press and hold the brew start switch until you hear the brew solenoid click on-and-off three times (approximately 5 seconds). Release the switch immediately. Failure to release the switch within 2 seconds of the third click causes the volume setting to be aborted and the previous volume setting will remain in memory.

4. Allow the cycle to continue until the desired amount of water is dispensed and then place the "TEA/OFF/COFFEE" switch in the "OFF" position.

The brewer is now set to dispense this amount of water for each subsequent brew cycle.

P1864

P1901

Adjusting Brew Volumes

BREW VOLUME SET-UP: Use the following steps

when setting up the brewer for the first time.

1. Place an empty funnel in the funnel rails and an empty decanter (when switch is in "COFFEE" position) or 3gallon dispenser (when switch is in the "TEA" position) beneath the funnel.

2. Place the "TEA/OFF/COFFEE" switch in the "TEA" or "COFFEE" position.

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To increase the amount of water for each brew

cycle place an empty funnel in the funnel rails and an empty decanter (when switch is in the "COFFEE" position) or empty 3-gallon dispenser (when switch is in the "TEA" position) beneath the funnel. Place the "TEA/OFF/COFFEE" switch in the "TEA" or "COFFEE" position. Press and hold the "START" switch until you hear the solenoid click on-and-off three times (approximately 5 seconds), then release the "START" switch immediately. Failure to release the switch within 2 seconds of the third click causes the volume setting to be aborted and the previous volume setting will remain in memory. Momentarily press and release the "START" switch once for each 3.2 ounces (approximate) of water to be added to the prior setting and allow the brew cycle to finish.

To decrease the amount of water for each brew

cycle place an empty funnel in the funnel rails and an empty decanter (when switch is in the "COFFEE" position) or empty 3-gallon dispenser (when switch is in the "TEA" position) beneath the funnel. Place the "TEA/OFF/COFFEE" switch in the "TEA" or "COFFEE" position. Momentarily press and release the "START" switch once for each 3.2 ounces (approximate) of water to be removed from the existing setting. Press and hold the "START" switch until you hear the solenoid click on-and-off three times (approximately 5 seconds), then release the "START" switch immediately (failure to release the switch within 2 seconds of the third click causes the volume setting to be aborted and the previous volume setting will remain in memory) and allow the cycle to finish.

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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.

Before troubleshooting this brewer, check for the following:

A. Control Board

Locate J6 connector on control board. If jumper is across pins 1 & 2, board is set up to operate this coffee/tea brewer which does not use a refill system. See page 7 for proper jumper location.

B. Also make sure before servicing brewer that voltage is present at control board. Check for voltage across pins

1 & 7 of the eight pin J1 connector (black and white wires). If voltage is present, proceed with testing. If voltage is not present, check wiring and voltage at socket. Correct the problem and retest before proceeding with testing.

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