Bunn Coffee Maker TU3 Installation Manual
TU3
!
CAUTION
HOT
LIQUID
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
10225.0000N 03/04 ©1987 Bunn-O-Matic Corporation
www.bunnomatic.com
CONTENTS
Introduction .....................................................................2
Warranty ..........................................................................2
User Notices .................................................................... 3
Electrical & Plumbing Requirements ............................... 4
Initial Set-Up ....................................................................5
Adjusting Brew Volumes .................................................. 6
Auto Sweetener Set-up ....................................................6
Operating Controls ........................................................... 7
Cleaning ...........................................................................7
Auto Sweetener Cleaning .................................................8
Tea Brewing ..................................................................... 8
Troubleshooting ...............................................................9
Service ...........................................................................15
Wiring Diagrams ............................................................29
INTRODUCTION
This equipment will brew a three-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.
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:
1) All equipment other than as specified below: 2 years parts and 1 year labor.
2) Electronic circuit and/or control boards: parts and labor for 3 years.
3) Compressors on refrigeration equipment: 5 years parts and 1 year labor.
4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis: parts and
labor for 3 years or 30,000 pounds of coffee, whichever comes first.
These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be
commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the
applicable warranty period. This warranty does not apply to any equipment, component or part that was not manufactured
by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect, alteration, improper installation or operation,
improper maintenance or repair, damage or casualty. This warranty is conditioned on the Buyer 1) giving 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; 2) if requested by BUNN, shipping the defective equipment prepaid to an authorized
BUNN service location; and 3) receiving prior authorization from BUNN that the defective equipment is under warranty.
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.
If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its exclusive
option while the equipment is under warranty, shall either 1) provide at no charge replacement parts and/or labor (during
the applicable parts and labor warranty periods specified above) to repair the defective components, provided that this
repair is done by a BUNN Authorized Service Representative; or 2) shall 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, AT BUNN’S SOLE OPTION
AS SPECIFIED HEREIN, TO REPAIR, 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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10225 031804
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
!
WARNING
Fill water tank before turning -on
thermostat or connecting appliance
to power source.
Use only on a properly protected
circuit capable of the rated load.
Electrically ground the chassis.
Follow natinal/local electrical codes.
Do not use near combustibles.
FAILURE TO COMPLY RISKS EQUIPMENT
DAMAGE, FIRE, OR SHOCK HAZARD
READ THE ENTIRE OPERATING MANUAL
BEFORE BUYING OR USING THIS PRODUCT
THIS APPLIANCE IS HEATED WHENEVER
CONNECTED TO A POWER SOURCE
00831.0000F 3/98 ©1988 BUNN-O-MATIC CORPORATION
#03408.0002
#03408.0000
#03409.0000
Page 3
#03409.0002
10225 031804
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 volts ac, 15 amp, single phase, 60 Hz.
"A" model brewers require 2-wire, grounded service rated 240 volts ac, 10 amp, single phase, 50 Hz.
"B" model brewers require 2-wire, grounded service rated 100 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. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.
3. Remove top cover from the brewer.
4. Rotate the control thermostat knob fully counterclockwise to the "OFF" position and replace the top cover.
5. Connect the brewer to the power source.
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 (138) and 90
psi (620 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 (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 cap from the bulkhead fitting 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 at the rear of the brewer.
3. Flush the water line and securely attach it to the flare fitting on the strainer/
flow control.
4. Turn on the water supply.
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10225 071500
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 and replace the top lid.
3. Set the delay knob of the timer on the right side of the hood at eight minutes and the dilution knob of the timer
on the right side of the hood at three minutes and forty-five seconds.
4. Remove the metal discharge tip from the funnel to speed up the set-up procedure. Insert the empty funnel
into the funnel rails.
5. Place an empty dispenser on the brewer base. Be sure the funnel discharge is directly above the hole in the
dispenser top lid.
6. Plug in the brewer and place the ON/OFF switch in the "ON" position. Momentarily press the start switch.
Water will flow into the tank and will shut off after three minutes. Press the start switch again. During the
second period, the tank will fill to its capacity and the excess will flow from the funnel into the dispenser.
7. Place the ON/OFF switch in the "OFF" position.
8. Disconnect the brewer from the power source and remove the top lid.
9. Rotate the control thermostat knob fully clockwise to the "ON" position and replace the top lid.
10. Plug in the brewer and wait for the water in the tank to heat to the proper temperature (approximately 20
minutes). Some water will drip from the funnel during this time; this is due to expansion and should not
occur thereafter.
11. Place an empty dispenser under the funnel.
12. Place the ON/OFF switch in the "ON" position and press the start switch. Empty the dispenser after water has
stopped flowing from the funnel.
13. Allow the water in the tank to reheat to the proper temperature.
14. Place the ON/OFF switch in the "ON" position and press the start switch.
15. Place the ON/OFF switch in the "OFF" position immediately after water stops flowing from the funnel. Check
the water volume in the dispenser. It should be seventy-six ounces.
16. If not, unplug the brewer, remove the top lid, and adjust the timer on the left side of the hood as required. See
Adjusting Brew Volumes.
cycle.
17. Repeat steps 13-16 until the proper water volume is achieved.
18. Unplug the brewer and remove the top lid.
19. Set the delay knob of the timer on the right side of the hood at three minutes and empty the dispenser.
20. Place the ON/OFF switch in the "ON" position, momentarily press the start switch, and allow both the concentrate and dilution cycles to occur.
21. When all water stops flowing, check the water volume in the dispenser. It should be 396 ounces.
22. If not, unplug the brewer and remove the top lid.
23. Adjust the dilution knob of the timer on the right side of the hood as required. Replace the top lid, plug in the
brewer, start, and measure another brew cycle.
24. Repeat steps 20-23 until the proper water volume is achieved.
25. Return the delay knob of the timer on the right side of the hood to eight minutes. Replace the top lid and plug
in the brewer.
26. Reinstall the metal discharge tip into the funnel.
27. Load the funnel with a BUNN® paper filter and approximately four ounces of loose tea leaves.
28. Place the ON/OFF switch in the "ON" position, momentarily press the start switch, and allow both the concentrate and dilution cycles to occur. Observe the funnel discharge and the dilution streams near the end of the
brew cycle. The dilution stream should stop approximately thirty seconds after the funnel discharge has
stopped.
Replace the top lid, plug in the brewer, start, and measure another concentrate
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10225 071500
INITIAL SET-UP (cont.)
29. If not, unplug the brewer and remove the top lid.
30. Adjust the delay knob of the timer on the right side of the hood as required. Replace the top lid and plug in
the brewer.
31. Repeat steps 27-30 until the proper dilution timing is achieved.
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 tea, batch volumes will decrease due to absorption by the tea 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.
AUTO SWEETENER 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 and both rear panels.
2. Make sure the brewer water supply is off.
3. Connect sweetener hose from the bag in a box delivery system to the rear fitting marked "Sweetener" .
IMPORTANT - System delivery pressure must be regulated between 30-40 psi. System also needs to deliver
product for at least 4 minutes without shutting off. Some pump systems shut off after a few minutes of continuous running.
4. Set the "Delay knob on the dilution timer to the 3 minute setting. (The minimum delay setting)
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10225 031804
AUTO SWEETENER SET-UP (cont.)
5. Plug brewer into the power source.
6. Place an empty reservoir under the dilution nozzle of the brewer.
7. Close the adjustment valve on the rear of the brewer fully (clockwise), then open (counterclockwise) 1/2
turn.
8. Set the selector switch to the "Sweetened" side and press the "Start" switch momentarily. (After approxi-
mately 3 minutes the sweetener will come out of the dilution nozzle.)
9. Run sweetener for 1 minute, then set selector switch to the "Off" position. The flow will stop.
10. Measure the amount of sweetener dispensed and calculate if the volume needs to be increased or decreased
(Dilution cycle is usually between 3 to 3 1/2 minutes).
11. If adjustment is needed, turning the adjustment valve clockwise decreases the amount of sweetener dis-
pensed and turning the adjustment valve counterclockwise increases the amount of sweetener dispensed.
12. Set the "Delay" knob on the dilution timer back to the 6 to 7 minute setting.
13. After the desired volume has been set, turn the water supply on.
14. Reinstall the top lid, lower and upper rear panels.
The brewer may now be returned to service.
OPERATING CONTROLS
A. ON/OFF Switch
ON - Placing the switch in the left position allows the start switch to activate a timed brew cycle for three gallons
of tea.
OFF - Placing the switch in the right 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 ON/OFF switch is in the "ON" position.
C. OFF/SELECTOR Switch (Models with Sweetener Only)
UNSWEET - Placing the switch in the left positional allows the start switch to activate a timed brew cycle for three
gallons of tea without sweetener.
OFF - Placing the switch in the middle 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.
SWEET - Placing the switch in the right positional allows the start switch to activate a timed brew cycle for three
gallons of tea with sweetener.
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.
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10225 031804
CLEANING (cont.)
2. Place the ON/OFF 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 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.
CAUTION - DO NOT KEEP BREWED ICED TEA OVERNIGHT. THE SERVER MUST BE CLEANED DAILY.
AUTO SWEETENER CLEANING
1. Remove the connector off of the bag in a box.
2. Place the end in a bucket of hot water (120°-130°F)
3. Place an empty reservoir on the base under the dilution nozzle.
4. Set the selector switch to the "Sweetened" setting.
5. Press and release the "Start" switch.
6. Run three brew cycles in a row, emptying the reservoir after each cycle.
7. When the three cycles have been completed, hook the connector back up to the bag in a box system. (This
will keep buildup from occurring in the system.)
This procedure should be performed weekly or as needed to keep the system clear.
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 four ounces is recommended.
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. Momentarily press the start switch.
CAUTION - The funnel contains hot liquids. Remove funnel slowly.
8. Carefully remove the brew funnel and discard the used filter when tea no longer drips from the funnel tip.
9. Place the ON/OFF switch in the "OFF" position to prevent a false start.
10. Fresh tea is available at the faucet.
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10225 031804
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)
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.
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10225 021599
TROUBLESHOOTING (cont.)
PROBLEM
Brew cycle will not start (cont.)
PROBABLE CAUSE
4. ON/OFF Switch
5. Start Switch
6. Brew Timer
7. Brew Solenoid Valve
8. Internal Flow control (.195 GPM)
REMEDY
Refer to
Service
- ON/OFF Switch
for testing. See page 24
Refer to
Service
- Start Switch for
testing procedures. See page 26
Refer to
Service
- Brew Timer for
testing procedures. See page 17 or
18
Refer to
Service
- Brew Solenoid
Valve for testing procedures. See
page 16
(A) Direction of flow arrow must be
pointing towards brewer.
(B) Remove the flow control and
check for obstructions. Clear or replace.
Water is not hot
Dilution cycle will not start
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
1. ON/OFF Switch
2. Start Switch
3. Dilution Timer
Refer to
Service
- Limit Thermostat
for testing procedures. See page 23
Refer to
Service
- Control Thermostat for testing procedures. See
page 20
Refer to
Service
- Tank Heater for
testing procedures. See page 28
Refer to
Service
- ON/OFF Switch
for testing procedures. See page 24
Refer to
Service
- Start Switch for
testing procedures. See page 26
Refer to
Service
- Dilution Timer for
testing procedures. See page 22
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10225 031804
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