Bunn TU5Q User Manual

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®
TU5Q
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
10777.0000B 4/00 © 1994 Bunn-O-Matic Corporation
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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10777 041500
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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
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. 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.)
4
2
3
1
MINUTES
MINUT
ES
BUNN-O-MA
TIC
P/N 05791-0006 120 VAC
5
3
6
4
7
5
6
6 7
8
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
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Page 15
BUNN-O-MATIC
6
P/N 05791-0006 120 VAC
5
4
3
MINUTES
5
6
4
7
3
8
7
2
1
6
MINUTES
Page 15
Page 16
SERVICE (cont.)
BUNN-O
-MATIC
P/N 05791-0006 120 VAC
BUNN
OFF
HI
BUNN
OFF
HI
CONTROL THERMOSTAT
VAC
5
6
4
7
BUNN-O-MATIC
3
8
6
7
P/N 05791-0006 120
2
5
1
6
4
MINUTES
3
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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Page 17
SERVICE (cont.)
4
2
3
1
MINUTES
MINUTES
B
UNN-O-MATIC
P
/
N
05791-0006 120 VAC
5
3
6
4
7
5
6
6 7
8
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.
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 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
Page 18
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
Page 18
Page 19
SERVICE (cont.)
MINUT
ES
P/N 05791-0006 120 VAC
LIMIT THERMOSTAT
FIG. 14 LIMIT THERMOSTAT
BUNN-O-MATIC
P/N 05791-0006 120 VAC
5
4
3
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
5
6
4
7
3
8
6
7
2
1
6
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
Page 19
10777 041500
Page 20
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
Page 20
10777 041500
Page 21
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
10777 041500
Page 22
SERVICE (cont.)
BUNN-O-MATIC
TANK HEATER
5
6
4
7
BUNN-O-MATIC
3
8
6
7
P/N 05791-0006 120 VAC
2
5
1
6
4
MINUTES
3
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
10777 041500
P1284.80
Page 23
Page 23
10777 041500
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