Bunn TWF, TW User Manual

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BUNN® TW

TWF

OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

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

10510.0000 11/00 © 1990 Bunn-O-Matic Corporation

CONTENTS

 

Introduction .............................................................

2

Warranty ..................................................................

2

User Notices ............................................................

3

Electrical Requirements ...........................................

4

Plumbing Requirements ..........................................

4

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

5

Adjusting Brew Controls ..........................................

6

Cleaning ...................................................................

6

Operating Controls...................................................

7

Tea Brewing .............................................................

7

Troubleshooting .......................................................

8

Service...................................................................

14

Wiring Diagram .....................................................

31

INTRODUCTION

This equipment will brew a half-gallon batch of hot coffee into an airpot server or dispenser and a threegallon 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 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.

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#00831.0000

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E©ut1i/09Bu©

#00656.0000

ELECTRICAL REQUIREMENTS

CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up.

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

120/208V model brewers require 3-wire, grounded service rated 120/ 208 volt, 20 amp, single phase, 60 Hz.

L2 RED

 

WHITE

120V.A.C.

208V.A.C.

 

NEUTRAL

120V.A.C.

L1 BLACK

 

Electrical Hook-Up

CAUTION – Improper electrical installation will damage electronic components.

1.An electrician must provide electrical service as specified.

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

3.a) 120V brewers have an attached cordset. Plug in the brewer and proceed to #6.

b) 120/208V brewers, 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 power source.

5.Connect the brewer to the power source and verify the 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.

PLUMBING REQUIREMENTS

These brewers must be connected to a cold water system with operating pressure between 20 (128) and 90 psi (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.

1.Remove the shipping cap(s) from the bulkhead fitting(s) on the rear of the brewer.

2.Attach the flare fitting from the short piece of tubing on the strainer/flow control (supplied) to the water inlet fitting(s) at the rear of the brewer.

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

4.Turn on the water supply.

5.On brewers with a faucet, place an empty vessel beneath the faucet and lift the handle until water is dispensed.

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).

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PLUMBING REQUIREMENTS (cont.)

BREWERS W/OUT FAUCET

BREWERS W/FAUCET

 

INITIAL SET-UP

CAUTION – The brewer must be unplugged 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 and replace the top lid.

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

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

5.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. Empty the dispenser when this third cycle stops.

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

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

8.If not, adjust the Iced Tea Brew Timer (right timer) as required. (See Adjusting Brew Volume)

9.Start, and measure another cycle.

10.Repeat steps 7-9 until the recommended total water volume (396 ounces) is achieved.

11.The concentrate valve is pre-adjusted to deliver the correct ratio of brew water to dilution water.

12.Unplug the brewer, remove the top lid, rotate the control thermostat knob fully clockwise to the “ON” position and replace the top lid.

13.Empty the dispenser.

14.Plug in the brewer 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.

15.Place the TEA/OFF/COFFEE switch in the “COFFEE” position and begin another brew cycle. Empty the reservoir after water has stopped flowing from the funnel.

16.Allow the water in the tank to heat to the proper temperature and begin another brew cycle.

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

18.If not, adjust the Coffee Brew Timer (left timer) as required. (See Adjusting Brew Volume)

19.Start, and measure another cycle.

20.Repeat steps 17-19 until the recommended total water volume (64 ounces) is achieved.

21The brewer is now ready to brew approximately one-half gallon of hot coffee or 3-gallons of freshly brewed room temperature tea.

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INITIAL SET-UP (cont.)

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.

CLEANING

CAUTION – Do not keep brewed tea overnight. Clean and sanitize your iced tea dispenser daily

1.Remove and thoroughly clean the 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. Insert the spring into the airvent 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.

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OPERATING CONTROLS

A. TEA/OFF/COFFEE Switch

TEA– Placing the switch in the left position allows the start switch to activate a timed brew cycle delivering .5 gallon of tea concentrate and 2.5 gallons of dilution water into the dispenser.

OFF – Placing the switch in the center position stops the brew cycle. Stopping a brew cycle after it has started will not stop the flow of water into the funnel until the tank syphons down to its level. The switch should always be placed in this position after a brew cycle and whenever the brewer is unattended.

COFFEE– Placing the switch in the right position allows the start switch to activate a timed brew cycle delivering

.5 gallon of hot coffee into an airpot dispenser. B. Start Switch

Starts a brew cycle when the TEA/OFF/COFFEE switch is in either the “TEA” or “COFFEE” position.

BREWING

1.Begin brewing with a clean empty brew funnel and dispenser. (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 fresh tea leaves or coffee into the filter. Approximately 4 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 desired position.

7.Momentarily press the start switch.

CAUTION – The funnel contains hot liquid. Remove funnel slowly.

8.Carefully remove the brew funnel and discard its contents after liquid stops flowing from the funnel.

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

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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 personnel.

All electronic components have 120 volt ac and low voltage dc potential on their terminals. Shorting of terminals or the application of external voltages may result in board failure.

Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. If an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a terminal or crimp.

Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are energized for more than ten minutes without a supply of water.

The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will help to avoid twists and kinks in the tubing.

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

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

WARNING –

Exercise extreme caution when servicing electrical equipment.

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

Follow recommended service procedures

Replace all protective shields or safety notices

Problem

Probable Cause

Remedy

Brew cycle(s) will not start

1. No water

Water lines and valves to the brewer

 

 

 

must be open.

 

2. No power or incorrect voltage to

Check circuit breakers or fuses.

 

the brewer

 

 

3.

External Strainer/ Flow Control

(A) Direction of flow arrow must be

 

(.750 GPM)

pointing towards the brewer.

 

 

 

(B) Remove the strainer/flow con-

 

 

 

trol and check for obstructions.

 

 

 

Clear or replace.

 

4.

TEA/OFF/COFFEE Switch

Refer to Service - TEA/OFF/COFFEE

 

 

 

Switch for testing. See page 26

 

5.

Start Switch

Refer to Service - Start Switch for

 

 

 

testing procedures. See page 27

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TROUBLESHOOTING (cont.)

 

 

PROBLEM

PROBABLE CAUSE

REMEDY

Brew cycle(s) will not start (cont.)

6. Brew Timer

Refer to Service - Brew Timer (Iced

 

A) Iced Tea

 

 

Tea) for testing procedures. See

 

 

page 20 or 21

 

B) Hot Coffee

Refer to Service - Brew Timer (Hot

 

 

Coffee) for testing procedures. See

 

 

page 17 or 18

 

7. Brew Solenoid Valve

Refer to Service - Brew Solenoid

 

A) Iced Tea

Valve (Iced Tea) for testing proce-

 

 

dures. See page 16

 

B) Hot Coffee

Refer to Service- Brew Solenoid

 

 

Valve (Hot Coffee) for testing pro-

 

 

cedures. See page 15

8. Internal Flow control (.195 GPM) (Hot Coffee Only)

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

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

Brew water is not hot

1. Limit Thermostat

 

Refer to Service - Limit Thermostat

 

CAUTION - Do not eliminate or by-

for testing procedures. See page 25

 

pass limit thermostat. Use only

 

 

BOM

replacement

part

 

#29329.1000

2. Thermal Fuse

CAUTION - Do not eliminate or bypass thermal fuse.

3. Control Thermostat

Refer to Service - Thermal fuse for testing procedures. See page 29

Refer to Service - Control Thermostat for testing procedures. See page 23

 

4.

Tank Heater

Refer to Service - Tank Heater for

 

 

 

testing procedures. See page 28

Dilution (Iced Tea) cycle will not

1.

TEA/OFF/COFFEE Switch

Refer to Service - TEA/OFF/COFFEE

start

 

 

Switch for testing procedures. See

 

 

 

page 26

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TROUBLESHOOTING (cont.)

 

 

 

PROBLEM

PROBABLE CAUSE

REMEDY

Dilution (Iced Tea) cycle will not

2. Start Switch

Refer to Service - Start Switch for

start (cont.)

 

 

testing procedures. See page 27

 

3.

Brew Timer (Iced Tea)

Refer to Service- Brew Timer (Iced

 

 

 

Tea) for testing procedures. See

 

 

 

page 20 or 21

 

4.

Brew Solenoid Valve (Iced Tea)

Refer to Service - Brew Solenoid

 

 

 

Valve (Iced Tea) for testing proce-

 

 

 

dures. See page 16

 

5.

Dilution Solenoid Valve

Refer to Service - Dilution Solenoid

 

 

 

Valve for testing procedures. See

 

 

 

page 24

Inconsistent beverage level in dispenser (Hot Coffee)

1. Internal Flow Control (.195 GPM)

2.Syphon System

3.Lime Build-up

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

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

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

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

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

 

4.

Water Pressure

The water pressure to the brewer

 

 

 

must be at least 20 psi (128 kPa).

Consistently high or low beverage

1.

Brew Timer

With the TEA/OFF/COFFEE switch in

level in the dispenser

 

 

the "TEA" position adjust the needle

 

 

 

valve to achieve the recommended

 

 

 

76 oz of concentrate then the timer

to achieve a total of 396 oz for each three-gallon brew cycle.

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