Bunn CWTF-MV User Manual

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BUNN® CWTF-MVCWTF-APS-MV

CWTF-TS-MV

CWTF-TSR-MV

OPERATING & SERVICE MANUAL

BUNN-O-MATICCORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

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

28182.0000C 9/00 ©1997 Bunn-O-MaticCorporation

INTRODUCTION

This equipment will brew a half-gallonbatch of coffee into an awaiting dispenser. It can be easily configured for 120V 15 amp, 120V 20 amp, 120/208V 20 amp or 120/240V 20 amp. The brewer has a hot water faucet for allied beverage use. It is only for indoor use on a sturdy counter or shelf.

WARRANTY

Bunn-O-MaticCorp. (“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) 529-6601or 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.

USER NOTICES

Carefully read and follow all notices in this manual and on the equipment. All labels on the equipment should be kept in good condition. Replace any unreadable or damaged labels.

#12364.0000

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USER NOTICES (CONT.)

#02765.0000

#28181.0001

#28181.0002

TWO WARMER BREWERS ALSO CWAPS,

ONE WARMER BREWERS

CWTS & CWTSR

 

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28182 021500

 

#2818100658.0000

ELECTRICAL REQUIREMENTS

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

Requires 2-wire,

Requires 2-wire,

Requires

3-wire,

grounded service

grounded service

grounded

service

rated 120 volts ac,

rated 120 volts ac,

rated 120/208 volts

20 amp, single

15 amp, single

ac, 20 amp, single

phase, 60 Hz.

phase, 60 Hz.

phase, 60 Hz.

ELECTRICAL HOOK-UP

CAUTION – Improper electrical installation will damage electronic components. This unit is factory wired for operation on a 120 volt, 15 amp service (1320W Version).

1.An electrician must provide electrical service and verify that the tank heater connections are connected as specified in the above diagram.

2.Determine the available on-siteelectrical service.

3.Select the desired unit wattage based on the available on-siteelectrical service.

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

5.Place the heater switch at the rear of the brewer in the "OFF" (lower) position.

6.Remove the front panel beneath the sprayhead.

7.Feed the supply leads through the rear panel of the brewer.

8.Using the above diagrams, connect the desired electrical service to the field wiring terminal block and remove the top cover of the brewer to verify the tank heater terminal block connections.

9.The electrical service connections at the field wiring terminal block must agree with the tank heater terminal block connections as specified in the above diagram.

10.Before proceeding, verify the voltage at the field wiring terminal block. Replace the panel and top cover.

11.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.

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PLUMBING REQUIREMENTS

These brewers 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. Ashut-offvalve 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 is14" flare.

NOTE - Bunn-O-Maticrecommends14" copper tubing for installations of less than 25 feet and38" for more than 25 feet from the12" water supply line. A tight coil of copper tubing in the water line will facilitate moving the brewer to clean the countertop.Bunn-O-Maticdoes 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.Flush the water line and securely attach it to the tee.

2.Turn on the water supply.

3.Place an empty vessel beneath the faucet and lift the handle until water is dispensed.

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INITIAL SET-UP

CAUTION - The brewer must be disconnected from the power source throughout the initialset-up,except when specified in the instructions.

1.Insert an empty funnel into the funnel rails.

2.Place an empty dispenser under the funnel.

3.Place the heater switch at the rear of the brewer in the "OFF" (lower) position and connect the brewer to the power source.

4.Connect the brewer to the power source, place the "ON/OFF" switch in the "ON" (upper) position, and momentarily press and release the start switch. Water will begin flowing into the tank. When water stops flowing into the tank, initiate a second and a third brew cycle. During the third brew cycle the tank will fill to its capacity and the excess will flow from the sprayhead, out of the funnel, and into the dispenser.

5.When the flow of water from the funnel stops, place the heater switch at the rear of the brewer in the “ON” (upper) position and wait approximately twenty minutes for the water in the tank to heat to the proper temperature. Some water will drip from the funnel during this time; this is due to expansion and should not occur thereafter.

6.Empty the dispenser, place the "ON/OFF" switch in the "ON" (upper) position, and momentarily press and release the start switch.

7.Place the "ON/OFF" switch in the "OFF" (lower) position after water has stopped flowing from the funnel, and let the water in the tank reheat to the proper temperature.

8.Empty the dispenser, place the "ON/OFF" switch in the "ON" (upper) position, and momentarily press and release the start switch. Check the water volume in the dispenser after water has stopped flowing from the funnel. It should be 64 ounces.

9.If not, adjust the brew timer as required. See Adjusting Brew Volumes. Start, and measure another brew cycle.

10.Repeat step 9 until 64 oz water volume is achieved.

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

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 dispenser 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 everytwo-secondinterval 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.

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090100

 

 

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

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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-MaticTechnical 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 will not start

1. No water

Waterlinesandvalvestothebrewer

 

 

must be open.

 

2. No power or incorrect voltage to

(A1) Check the terminal block for

 

the brewer

120 volts across the black and

 

 

white terminals on two wire 120

 

 

volt brewers.

 

 

(A2) Check the terminal block for

 

 

120 volts ac across the red and

 

 

white and the black and white ter-

 

 

minals on 120/208V and 120/240V

 

 

volt brewers.

 

 

(B) Check circuit breakers or fuses.

 

3. ON/OFF Switch

Refer to Service - ON/OFF Switch

 

 

for testing. See page 18

 

4. Start Switch

Refer to Service - Start Switch for

 

 

testing procedures. See page 20

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TROUBLESHOOTING (cont.)

 

 

PROBLEM

PROBABLE CAUSE

Brew cycle will not start (cont.)

5.

Timer

 

6.

Solenoid Valve

 

7.

Water strainer/flow control

 

(.222 GPM)

Water is not hot

1. Tank Heater Switch

2. Limit Thermostat

CAUTION - Do not eliminate or bypass limit thermostat. Use only replacement part #29329.1000

3. Control Thermostat

4. Tank Heater(s)

5. Fuse Holder and Fuse Assembly

6. Thermal Fuse

REMEDY

Refer to Service - Timer for testing procedures. See page 26 or 27

Refer to Service - Solenoid Valve for testing procedures. See page 19

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

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

Refer to Service - Tank Heater Switch for testing procedures. See page 23

Refer to Service - Limit Thermostat for testing procedures. See page 17

Refer to Service - Control Thermostat for testing procedures. See page 15

Refer to Service - Tank Heater(s) for testing procedures. See page 21

Refer to Service -FuseHolder and Fuse Assembly for testing procedures. See page 16

Refer to Service - Thermal Fuse for testing procedures. See page 25

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TROUBLESHOOTING (cont.)

 

 

 

PROBLEM

PROBABLE CAUSE

REMEDY

Inconsistent beverage level in

1.

Strainer/flow control (.222

(A) Direction of flow arrow must

dispenser

GPM)

be pointing towards the brewer.

 

 

 

(B) Remove the strainer/flow con-

 

 

 

trol and check for obstruction.

 

 

 

Clear or replace.

 

2.

Syphon System

The brewer must be level or slightly

 

 

 

lower in front to syphon properly.

 

3.

Lime Build-up

Inspect the tank assembly for ex-

 

CAUTION - Tank and tank compo-

cessive lime deposits. Delime as

 

nents should be delimed regularly

required.

 

depending on local water condi-

 

 

tions. Excessive mineral build-up

 

 

on stainless steel surfaces can

 

 

initiate corrosive reactions result-

 

 

ing in serious leaks.

 

 

4.

Water Pressure

The water pressure to the brewer

 

 

 

must be at least 20 psi (138 kPa).

Consistently low beverage level

1. Timer

Refer to Service - Timer for adjust-

in the dispenser

 

ing procedures. See page 26 or 27

 

2. Strainer/flow Control (.222

(A) Direction of flow arrow must

 

GPM)

be pointing towards brewer.

 

 

(B) Remove the strainer/flow con-

 

 

trol and check for obstructions.

 

 

Clear or replace.

Spitting or excessive steaming

1. Lime Build-up

Inspect tank assembly for exces-

 

CAUTION - Tank and tank compo-

sive lime deposits. Delime as re-

 

nents should be delimed regularly

quired.

 

depending on local water condi-

 

 

tions. Excessive mineral build-up

 

 

on stainless steel surfaces can

 

 

initiate corrosive reactions result-

 

 

ing in serious leaks.

 

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28182 021500