Bunn Coffee Maker OT15 Service Manual

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HIGH HEAT WARMER
T O N
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P E E
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FAILURE TO COMPLY RISKS GLASS FAILURE/HOT LIQUID BURNS AND FIRE H
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B
U B M O
AZARD
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
10021.0000G 7/00 © 1989 BUNN-O-MATIC CORPORATION
CONTENTS
Introduction ............................................................... 2
User Notices .............................................................. 3
Electrical Requirements ............................................. 4
Plumbing Requirements ............................................ 4
Initial Set-Up.............................................................. 5
Adjusting Brew Volumes............................................ 6
Operating Controls..................................................... 6
Coffee Brewing .......................................................... 7
Cleaning..................................................................... 7
Troubleshooting ......................................................... 8
Service....................................................................... 12
Wiring Diagrams........................................................ 26
INTRODUCTION
This equipment will brew a half-gallon batch of coffee into an awaiting decanter at the press of a button. The OT has two and the RT has five warmers to keep the beverage at the right temperature, on the RT one of which is capable of heating water to boiling. 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.
Page 2
10021 071700
USER NOTICES
Carefully read and follow all notices on the equipment and in this manual. They were written for your protection.
All notices on the equipment should be kept in good condition. Replace any unreadable or damaged labels.
00831.0000
00658.0000
00656.0000
Page 3
WARNING
!
HIGH HEAT WARMER
DO NOT BOIL DECANTER DRY
KEEP COMBUSTIBLES AWAY
FAILURE TO COMPLY RISKS
GLASS FAILURE/HOT LIQUID
BURNS AND FIRE HAZARD
00688.0000
10021 101598
200 OR 240V.A.C.
L1 BLACK
L2 RED
ELECTRICAL REQUIREMENTS
CAUTION - Do not connect the brewer to the power source until specified in Initial Set-Up.
WHITE
NEUTRAL L1 BLACK
120V.A.C.
MODELS OT15 & 20 require 2­wire, grounded service rated 120 volts ac, 15 or 20 amp re­spectively, single phase, 60 Hz.
L2 RED
WHITE
NEUTRAL
L1 BLACK
120V.A.C.
208 or 240V.A.C.
120V.A.C.
MODELS OT35 & RT35 require 3-wire, grounded service rated 120/208 or 120/240 volts ac, 20 amp, single phase, 60 Hz.
Model 15 has an attached cordset.
Electrical Hook-Up
Model OT15 has an attached cordset. Models OT20, OT35, & RT35, proceed as follows:
CAUTION – Improper electrical installation will dam-
age 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 the front panel beneath the sprayhead
and rotate the control thermostat knob fully counterclockwise to the "OFF" position and re­place the panel.
4. Remove the rear panel, feed the cord through
the strain relief, and connect it to the terminal block.
5. Connect the brewer to the power source and
verify the voltage at the terminal block before proceeding. Replace the rear panel.
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
This brewer must be connected to a cold water
system with operating pressure between 20 and 90 psi from a 1/2" or larger supply line. A shut-off valve should be installed in the line before the brewer. In­stall a regulator in the line when pressure is greater than 90 psi to reduce it to 50 psi. The water inlet fitting is 1/4" flare.
RED
NEUTRAL L1 BLACK
MODELS OTA, RTA & RT35B
require 2-wire, grounded ser­vice rated 240 volts ac or 200 volts ac, 20 amp single phase,
MODEL RT25B requires 2­wire, grounded service rated 100 volts ac, 20 amp single phase, 50 Hz.
50 Hz.
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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 counter top. Bunn­O-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).
Page 4
100V.A.C.
P1709
10021 101598
PLUMBING REQUIREMENTS (Cont.)
Plumbing Hook-Up
Model OT15 has an attached water strainer, proceed to step 2. Models OT20, OT35, & RT35, proceed as follows:
1. Remove the rear panel and bottom pan. Run the long piece of tubing from the strainer (supplied) under the brewer and attach it to the water inlet fitting on the solenoid. Reinstall the bottom pan and rear panel.
2. Flush the water line and securely attach it to the 1/4" flare fitting on the strainer.
3. Turn on the water supply.
INITIAL SETUP
CAUTION - The brewer must be disconnected from the power source throughout the initial set-up, except when
specified in the instructions.
1. Remove the front panel.
2. Rotate the control thermostat knob fully coun­terclockwise to the "OFF" position and replace the panel.
3. Insert an empty funnel into the funnel rails.
4. Place a decanter containing a small amount of water on the warmer beneath the funnel.
5. Connect the brewer to the power source, place the On/Off brew station warmer switch the up­per position, and momentarily press 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 this 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 de­canter.
NOTE - The On/Off brew station warmer switch must be in the upper position to initiate and complete a brew cycle.
6. Place the On/Off brew station warmer switch in the lower position.
7. Disconnect the brewer from the power source.
8. Remove the front panel.
9. Rotate the control thermostat knob fully clock­wise to the "ON" position and replace the front panel.
10. Connect the brewer to the power source 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.
11. Place an empty decanter under the funnel.
12. Place the On/Off brew station warmer switch in the upper position and momentarily press the start switch. Empty the decanter after water has stopped flowing from the funnel.
13. Allow the water in the tank to reheat to the proper temperature.
14. Place an empty decanter on the warmer and press the start switch. Check the water volume in the decanter after water has stopped flowing from the funnel. It should be 64 ounces.
15. If not, adjust the Timer as described in Adjusting Brew Volumes (Page 6).
16. Repeat steps 13-15 until 64 oz. water volume is achieved.
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TL4
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P1690
10021 071700
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.
OPERATING CONTROLS
MODEL OT
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Page 6
10021 071700
MODELS OT & RT A. On/Off Brew Station Warmer Switch
Placing the switch in the upper position supplies power to the brew station warmer and enables brew­ing. Placing the switch in the lower position cuts power to the brew station warmer and stops brewing. 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.
E. Upper Warmer Indicator Lamp
Glows whenever the upper warmer switch is in
the upper position showing that the warmer is on.
F. Left Rear Warmer Rotary Switch
Rotating the knob to the "ON" position supplies power to the left rear warmer. Rotating the knob to the "OFF" position cuts power to the left rear warmer.
NOTE - The On/Off brew station warmer switch must
G. Left Front Warmer Rotary Switch
be in the upper position to initiate and complete a brew cycle.
B. On/Off Brew Station Warmer Indicator Lamp
power to the left front warmer. Rotating the knob to the "OFF" position cuts power to the left front warmer.
Glows whenever the On/Off brew station warmer
switch is in the upper position showing that the
H. Right Front Warmer Rotary Switch
warmer is on and that the automatic brew cycle can be started.
C. Start Switch
power to the right front warmer. Rotating the knob to the "OFF" position cuts power to the right front warmer.
Starts a brew cycle when the On/Off brew station
warmer switch is in the upper position.
D. Upper Warmer Switch
Placing the switch in the upper position supplies power to the upper warmer. Placing the switch in the lower position cuts power to the upper warmer.
I. Right Rear Warmer Three Heat Rotary Switch
positions supply power to the right rear warmer. Ro­tating the knob to the "OFF" position cuts power to the right rear warmer. The “HIGH” position of this switch makes the warmer capable of boiling water.
COFFEE BREWING
Start each brew cycle with an empty, clean, half-gallon decanter.
Rotating the knob to the "ON" position supplies
Rotating the knob to the "ON" position supplies
Rotating the knob to the "LO", "MED", or "HIGH"
1. Insert a BUNN® filter into the funnel.
2. Pour the fresh coffee into the filter and level the bed of grounds by gently shaking.
3. Slide the funnel into the funnel rails.
4. Place the On/Off brew station warmer switch in the upper position.
5. Momentarily press the start switch.
6. When brewing is completed, simply discard the grounds and filter.
CLEANING
1. The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all
surfaces on Bunn-O-Matic equipment.
2. Check and clean the sprayhead. The sprayhead holes must always remain open.
3. With the sprayhead removed, insert the deliming spring (provided) all the way into the sprayhead tube.
When inserted properly, no more than two inches of spring should be visible. Saw back and forth five or six
times. Then, repeat this step for the air vent tube.
NOTE - In hard water areas, this may need to be done daily. It will help prevent liming problems in the brewer and takes less than a minute.
Page 7
10021 071700
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 electric components have 120 volt ac voltage on their terminals. Shorting of terminals or the application
of external voltages may result in equipment failure.
Intermittent operation of electronic equipment is unlikely. Component 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 unless disconnected from the power source. Keep away from combustibles.
WARNING
Exercise extreme caution when servicing electrical equipment.
Disconnect the brewer from the power source when servicing, except when electrical tests are specified.
Follow recommended service procedures
Replace all protective shields or safety notices
Problem
Equipment will not operate.
Brew cycle will not start.
Probable Cause
1. No power or incorrect voltage
1. No water
2. Water Strainer
3. Flow Control
Remedy
(A) Connect the brewer to the power source.
(B) Check the terminal block for the proper voltages.
(C) Check circuit breaker/fuse.
Check plumbing and shut-off valves.
(A) Direction of flow arrow must be pointing towards brewer.
(B) Remove the strainer and check for obstructions. Clear or replace.
(A) Direction of flow arrow must be pointing away from the solenoid.
Page 8
(B) Remove the control and check for obstructions. Clear or replace.
10021 101598
TROUBLESHOOTING (cont.)
Problem
Brew cycle will not start. (cont.)
Water flows into tank continuously (On/Off brew station warmer switch "OFF").
Water flows into tank continuously (On/Off brew station warmer switch "ON").
Probable Cause
4. On/Off Brew Station Warmer Switch
5. Start Switch
6. Brew Timer
7. Solenoid Valve
1. Solenoid Valve
1. Brew Timer
Remedy
Refer to Service - On/Off Brew Sta­tion Warmer Switch for testing pro­cedures. See page 19.
Refer to Service - Start Switch for testing procedures. See page 25.
Refer to Service - Brew Timer for testing procedures. See page 13 or
14.
Refer to Service - Solenoid Valve for testing procedures. See page 24.
Refer to Service - Solenoid Valve for testing procedures. See page 24.
Refer to Service - Brew Timer for testing procedures. See page 13 or
14.
Water is not hot.
Decanter warmer is not hot.
1. Limit Thermostat CAUTION: Do not eliminate or by­pass limit thermostat. Use only B.O.M. part #29329.1000
2. Control Thermostat
3. Tank Heater
1. Warmer Switches
2. Decanter Warmers
Refer to Service - Limit Thermostat for testing procedures. See page 23.
Refer to Service - Control Thermo­stat for testing procedures. See page 16.
Refer to Service - Tank Heater for testing procedures. See page 26.
(A) The Warmer Switch(es) must be in the "ON" position for the warmer to operate.
(B) Refer to Service - Warmer Switch(es) for testing procedures. See pages 19,20, & 21.
Refer to Service - Warmers for test­ing procedures. See pages 17 & 18.
Page 9
10021 071700
TROUBLESHOOTING (cont.)
Problem
Spitting or unusual steaming from sprayhead.
Inconsistent beverage level in de­canter.
Probable Cause
1. Control Thermostat
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.
1. Flow control
Remedy
Refer to Service - Control Thermo­stat for testing procedures. See page 16.
Inspect the tank assembly for exces­sive lime deposits. Delime as re­quired.
(A) Direction of flow arrow must be pointing away from the solenoid.
(B) Remove the control and check for obstructions. Clear or replace.
Consistently high or low beverage level in decanter.
Dripping from sprayhead.
2. Improper water pressure
3. Syphon system
1. Brew Timer adjustment
1. Syphon system
Check the operating water pressure to the brewer. It must be between 20 and 90 psi (138 and 620 kPa).
Water should flow freely from the sprayhead for approximately twenty seconds after the brew solenoid has shut-off and then stop flowing abruptly. The brewer must be level from front-to-back to syphon prop­erly.
Adjust the brew timer as required to achieve the recommended 64 oz for each brew cycle.
Water should flow freely from the sprayhead for approximately twenty seconds after the brew solenoid has shut-off and then stop flowing abruptly. The brewer must be level from front-to-back to syphon prop­erly.
2. Solenoid Valve
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Refer to Service - Solenoid Valve for testing procedures. See page 24.
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TROUBLESHOOTING (cont.) Problem
Beverage overflows decanter.
Weak beverage.
Probable Cause
1. Beverage left in decanter
1. Type of paper filters
2. Coffee
3. Sprayhead
4. Funnel loading
Remedy
The brew cycle should be started only with an empty decanter under the funnel.
BUNN® paper filters should be used for proper extraction.
A sufficient quantity of fine or drip grind coffee should be used for proper extraction.
B.O.M. sprayhead #01082.0000 should be used to properly wet the bed of ground coffee in the funnel.
The BUNN® paper filter should be centered in the funnel and the bed of coffee leveled by gentle shaking.
Brewer is making unusual noises.
5. Water temperature
1. Solenoid Valve
2. Plumbing lines
3. Water supply
Place a funnel over an empty de­canter on the warmer beneath the sprayhead. Place the On/Off brew station warmer switch in the upper position, press the start switch, and check the water temperature imme­diately below the sprayhead with an accurate thermometer. The reading should not be less than 195° F. Ad- just the control thermostat slightly clockwise to increase the water tem­perature.
The nut on top of the solenoid valve must be tight or it will vibrate dur­ing operation.
Plumbing lines should not rest on the counter top.
(A) The brewer must be connected to a cold water line.
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(B) Water pressure to the brewer must not be higher than 90 psi (620 kPa). Install a regulator if necessary to lower the working pressure to ap­proximately 50 psi (345 kPa).
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