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BUNN
®
OT & RT
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HIGH HEAT WARMER
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FAILURE TO COMPLY RISKS
GLASS FAILURE/HOT LIQUID
BURNS AND FIRE H
OPERATING & SERVICE MANUAL
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
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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.
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10021 071700
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00656.0000
00688.0000
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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
Page 5
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.
J1
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TL4
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P1690
10021 071700
Page 6
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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10021 071700
Page 7
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
Page 8
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
Page 9
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
Page 10
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
Page 10
Refer to Service - Solenoid Valve for
testing procedures. See page 24.
10021 071700
Page 11
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.
Page 11
(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).
10021 071700
Page 12
SERVICE
This section provides procedures for testing and replacing various major components used in this brewer
should service become necessary. Refer to Troubleshooting for assistance in determining the cause of any
problem.
Component Access
WARNING - Disconnect the brewer from the power
source before the removal of any panel or the replacement of any component.
The brew timer, and control thermostat are located behind the front panel, FIG. 1 located beneath
the brew funnel, attached with four #8-32 slotted-head
screws.
The base warmer(s), switch(es), indicator lamp,
start switch, tank "keep warm" heater, terminal block,
and solenoid valve, are located in the base. Access is
gained by removing the rear panel, FIG. 1 attached
with two #8-32 slotted-head screws
The limit thermostat, and tank heater are located
on the tank lid. Access is gained by removing the top
lid, FIG. 1 attached with three #8-32 slotted head
screws. On the model OT, the upper warmer, switch,
and associated indicator lamp are located on this removable top lid.
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 connect the brewer to the power
source.
Contents
Brew Timer (Early Models) ...................................13
Digital Timer (Late Models) .................................. 14
Control Thermostat...............................................16
Warmer(s)
OT:
Brew Station & Upper ............................................. 17
RT: Left Rear, Left Front, Brew Station, & Right Front ... 17
Right Rear Three Heat ............................................. 18
RT:
Warmer Switch(es)
OT: On/Off Brew Station & Upper .................................. 19
RT:
On/Off Brew Station ................................................ 19
RT: Left Rear, Left Front, & Right Front Rotary.............. 20
Right Rear Three Heat Rotary ................................. 21
RT:
Indicator Lamp(s) ................................................. 22
Limit Thermostat .................................................. 23
Solenoid Valve ......................................................24
Start Switch ..........................................................25
Tank Heater ........................................................... 26
Thermal Cut-off ................................................... 27
Wiring Schematics............................................... 28
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FIG. 1 ACCESS PANELS
Page 12
Page 13
SERVICE (cont.)
Brew Timer (Early Models)
5
4
MINUTES
BUNN-O-MATIC
P/N 2235-120 VAC
3
.5
1
2
P1690
FIG. 2 BREW TIMER
Location:
The brew timer is located behind the front panel
to the right of the tank, FIG. 2.
Test Procedure:
1. Disconnect the brewer from the power source
and separate the polarized, three-pin connectors
between the timer and brewer wiring harness and
rotate the brew timer dial fully counterclockwise.
2. Check the voltage across sockets 2 & 3 (white or
red and black wires) of the female connector with
a voltmeter when the On/Off brew station warmer
switch is in the upper position. Connect the
brewer to the power source. The indication must:
a) 120 volts ac for two wire 120 volt models.
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models and three wire 120/240 volt
models.
c) 100 volts ac for two wire 100 volt models.
3. Disconnect the brewer from the power source.
If voltage is present as described, reconnect the polarized, three-pin connectors, and proceed to #6.
If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness.
6. Disconnect the in-line connectors on the black
and white wires from the timer to the solenoid.
7. Check the voltage across the black and white
wires with a voltmeter when the On/Off brew station warmer switch is in the upper position and
the start switch is pressed to the lower position
and released. Connect the brewer to the power
source. The indication must be as described in
step 2, for approximately 20 seconds and then
return to its previous indication.
8. Disconnect the brewer from the power source.
If voltage is present as described, the brew timer is
operating properly. Reset the timer dial as required,
to obtain the desired brew volume.
If voltage is not present as described, replace the brew
timer.
Removal and Replacement:
1. Separate all connectors between the brewer wiring harness and the timer.
2. Remove the two 8-32 slotted-head screws holding the timer to the bracket.
3. Install the new timer to the bracket.
4. Refer to FIG.3 when reconnecting the wires.
5. Readjust the timer dial as required.
P1 BLU to Start Switch
P2 WHI (see below)
P3 BLK to ON/OFF Brew Station
Warmer Switch
2
1
.5
MINUTES
BUNN-O-MATIC
P/N 2235-120 VAC
3
4
5
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness.
4. Check the voltage across sockets 1 & 2 (blue and
white or red wires) of the female connector with
a voltmeter when the On/Off brew station warmer
switch is in the upper position and the start switch
is pressed to the lower position and held. Connect the brewer to the power source. The indication must be as described in step 2, until the start
switch is released.
5. Disconnect the brewer from the power source.
FIG. 3 BREW TIMER WIRING
MODEL
OT WHI to Indicator Lamp
RT WHI to Brew Station Warmer
Page 13
WHI to Solenoid Coil
BLK to Solenoid Coil
P1691
10021 071700
Page 14
SERVICE (cont.)
DIGITAL BREW TIMER (Late Models)
J1
J2
SET LOCK
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P2201
FIG. 4 DIGITAL BREW TIMER
Location:
The timers are located inside the front of the trunk
on the upper right side of the component brackets.
Test Procedure.
NOTE: Do not remove or install wires while timer board
is installed. Pressure applied to one side may cause
damage to the board.
1. Disconnect the brewer from the power source and
remove the front access panel.
2. Remove the one #8-32 screw securing circuit
board to the mounting bracket.
3. Remove circuit board and spacers (as required).
4. With a voltmeter, check the voltage across terminals TL1 and TL2 when the "ON/OFF" switch is in
the "ON" position. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 200 or 240 volts ac for two wire 200 or 240
volt models and three wire 120/240 volt models.
c) 100 volts ac for two wire 100 volt models.
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 brewer wiring har-
ness.
6. Disconnect the white/blue wire from terminal TL3
and the blue/black wire from terminal TL5. With a
voltmeter, check for continuity across the two
wires when the "ON/OFF" switch is in the "ON"
position (upper) and the START switch is pressed.
Connect the brewer to the power source. The
indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 200 or 240 volts ac for two wire 200 or 240
volt models and three wire 120/240 volt models.
c) 100 volts ac for two wire 100 volt models.
If continuity is present as described, reconnect the
wires and proceed to #7.
If continuity is not present as described, refer to the
Wiring Diagrams
and check the brewer wiring har-
ness.
7. With a voltmeter, check the voltage across terminals TL1 and TL4 when the "ON/OFF" switch is in
the "ON" position. Connect the brewer to the power
source. The indication must be 0 volts.
If voltage is as described, proceed to #8.
If voltage is not as described, disconnect the brewer
from the power source and replace the timer.
8. With a voltmeter, check the voltage across terminals TL1 and TL4 when the "ON/OFF" switch is in
the "ON" position. Connect the brewer to the power
source and press the "START" switch. The indication must be as follows:
a) 120 volts ac for two wire 120 volt models.
b) 200 or 240 volts ac for two wire 200 or 240
volt models and three wire 120/240 volt models.
c) 100 volts ac for two wire 100 volt models.
If voltage is present as described, the brew timer is
operating properly. Reset the timer as required, to
obtain the desired brew volume.
If voltage is not present as described, disconnect the
brewer from the power source and replace the timer.
Removal and Replacement:
1. Remove the one #8-32 screw securing circuit
board to the mounting bracket.
2. Remove circuit board and spacers (as required).
Page 14
10021 071700
Page 15
SERVICE (cont.)
DIGITAL BREW TIMER (Late Models)(cont.)
3. Remove all wires from the timer.
4. Attach all wires to the replacement timer board
prior to installation to the component mounting
bracket. Refer to FIG. 5 when reconnecting the
wires.
5. Install new circuit board with spacers (as required) to the component mounting bracket.
6. Adjust the timer as described below.
Timer Setting:
NOTE: Prior to setting or modifying volumes, check
that the brewer is connected to water supply, the tank
is properly filled, and a funnel and server are in place.
NOTE: All volume settings must be done with the
sprayhead installed.
1. Modifying brew volumes. To modify a brew vol-
ume, first check that the SET/LOCK switch is in the
“SET” position on the circuit board.
To increase a brew volume, place the ON/OFF
switch in the “ON” position, press and hold the START
switch until three clicks are heard. Release the switch
and press it again one or more times. (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.) 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.
2. Setting brew volumes. To set a brew volume,
first check that the SET/LOCK switch is in the “SET”
position on the circuit board. Place the ON/OFF switch
in the “ON” position, press and hold the START 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”.
NOTE: Several ounces of water will continue to syphon from the tank after turning the switch “OFF”.
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, volume will decrease due
to absorption by the coffee grounds.
3. Setting programming disable feature. If it be-
comes necessary to prevent anyone from changing
brew time once programmed, you can set the SET/
LOCK switch to the “LOCK” position. This will prevent any further programming until switch is once
again put into the “SET” position.
To decrease a brew volume, place the ON/OFF
switch in the “ON” position, press and release the
START switch once for every two-second interval to
be removed from the total brew time period; then immediately press and hold down the START 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.
Page 15
BLU/BLK wire from TL5 to P1
WHI/GRN wire from TL4 to (WHI) Solenoid
WHI/BLU wire from TL3 to (BLK) Solenoid
WHI wire from TL2 to P2
BLK wire from TL1 to P3
FIG. 5 DIGITAL TIMER WIRING
P2037
10021 071700
Page 16
SERVICE (cont.)
Control Thermostat
FIG. 6 CONTROL THERMOSTAT
The indication must be as described in step 2.
Voltage must not be indicated across these terminals when the thermostat is turned "OFF" (fully
counterclockwise).
5. Disconnect the brewer from the power source.
If voltage is present as described, the control thermostat is operating properly.
If voltage is not present as described, replace the control thermostat.
Removal and Replacement:
1. Remove both wires from the control thermostat
H
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B
F
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terminals.
2. Remove the top lid from the brewer to gain access to the thermostat bulb.
3. Remove the thermostat bulb by firmly pullingup on the capillary tube at the tank lid. This will
disengage the grommet from the tank lid.
4. Remove the two #8-32 screws holding the control thermostat to the bracket.
5. Fasten the new control thermostat to the brewer
housing.
P1689
6. Route the capillary tube up though the brewer
trunk.
Location:
The control thermostat is located behind the front
panel, FIG. 6 to the left of the tank.
To test the control thermostat, access will also
be needed to the tank heater located in the top of the
brewer.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Check the voltage across the blue wire on the
control thermostat and the white or red wire on
the tank heater with a voltmeter. Connect the
brewer to the power source. The indication must
be:
a) 120 volts ac for two wire 120 volt models.
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models and three wire 120/240 volt
models.
c) 100 volts ac for two wire 100 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 Diagrams and check the brewer wiring harness.
NOTE - Make sure that the capillary tube is away from
any electrical termination and is not kinked.
7. Slide the grommet to the red mark on the capillary tube.
8. Insert the 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.
9. Carefully bend the capillary tube so that the tube
and bulb inside the tank are in a vertical position.
10. Refer to FIG. 7 when reconnecting the wires.
11. Readjust the control thermostat dial as required.
BLU to Limit Thermostat
BLK to Tank Heater
4. Check the voltage across the black wire terminal
of the control thermostat and the white or red
wire on the tank heater with a voltmeter when
the control thermostat is turned "ON" (fully clockwise). Connect the brewer to the power source.
Page 16
P1098
FIG. 7 THERMOSTAT WIRING
10021 071700
Page 17
SERVICE (cont.)
Warmer(s)
OT: Brew Station & Upper
RT: Left Rear, Left Front, Brew Station, & Right Front
FIG. 8 WARMERS
5. Check for continuity from the wire terminal of
the white or red wire to the splice or indicator
lamp using the chart b5ew
FIG. 9 WARMERS FIG. 10 WARMER WIRING
Location:
OT: One of the warmers is beneath the brew funnel
and the other is on the top lid, FIG. 8.
RT: These warmers include the one beneath the
brew funnel, the ones on the right and left of the brew
station, and the one above and to the left of the brew
station as viewed from the front, FIG. 9.
Test Procedure:
1. Once the switch has been tested and switch fail-
ure has been eliminated, proceed as follows.
2. Disconnect the brewer from the power source
and remove the #4-40 screws attaching the
warmer being tested.
3. Lift the warmer assembly from the brewer and
invert the warmer making the wire terminals accessible for testing.
4. Check for continuity from the switch to the black
wire at the warmer element.
If continuity is present as described, proceed to #5.
Page 17
Page 18
SERVICE (cont.)
Warmer
RT: Right Rear Three Heat
If continuity is present as described, proceed to #5.
If continuity is not present as described, refer to the
Wiring Diagrams and check the brewer wiring harness.
5. Check for continuity across the two outside terminals on the warmer. Then across one of the
outside terminals and the center terminal. Finally, across the other outside terminal, and the
center terminal.
If continuity is present as described, the warmer is
operating properly.
If continuity is not present as described, replace the
warmer.
Removal and Replacement:
1. Remove the #4-40 slotted-head screws holding
the warmer to the brewer
2. Lift the warmer assembly from the brewer.
3. Disconnect the wires from the warmer.
4. Refer to FIG. 12 when reconnecting the wires.
5. Place the new warmer into the brewer and securely attach it using the #4-40 screws.
FIG. 11 THREE HEAT WARMER
Location:
The three heat warmer is above and to the right of the
brew station as viewed from the front, FIG. 11.
Test Procedure:
1. Once the switch has been tested and switch failure has been eliminated, proceed as follows.
2. Disconnect the brewer from the power source
and remove the #4-40 screws attaching the
warmer being tested.
3. Lift the warmer assembly from the brewer and
invert the warmer making the wire terminals accessible for testing.
4. Check for continuity of the red wire, the white
wire, then the brown wire from the switch to the
warmer element.
FIG. 12 THREE HEAT WARMER WIRING
Page 18
Page 19
SERVICE (cont.)
Warmer Switch(es)
OT: On/Off Brew Station & Upper
RT: On/Off Brew Station
FUNNEL CONTENTS
ARE HOT
FAILURE TO COM
8
5
6
:
N
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FIG. 13 WARMER SWITCHES
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness.
4. Check the voltage across the other switch terminal and the terminal on the indicator lamp with
white or red wires with a voltmeter when the
switch is in the upper position. Connect the
brewer to the power source. The indication must
be as described in step 2. Voltage must not be
present across these terminals in the lower posi-
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IF:
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tion.
5. Disconnect the brewer from the power source.
If voltage is present as described the switch is operating properly.
If voltage is not present as described, replace the
switch.
Removal and Replacement:
1. Compress the clips inside the housing and gen-
P1687
tly push the switch through the opening.
2. Remove the wires from the switch terminals.
3. Refer to FIG. 15 when reconnecting the wires.
4. Push the new switch firmly into the opening.
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CAUTION
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P1688
FIG. 14 WARMER SWITCHES
Location:
These switches are located beneath and to the
left of their associated warmers as viewed from the
front, FIG.s 13 and 14.
Test Procedure:
1. Locate the switch terminal with black wires that
do not go to the nearby indicator lamp.
2. Check the voltage across this terminal and the
terminal on the indicator lamp with white or red
wires with a voltmeter. Connect the brewer to
the power source. The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models and three wire 120/240 volt
models.
c) 100 volts ac for two wire 100 volt models.
3. Disconnect the brewer from the power source.
Page 19
BLK (A) (see below)
BLK (B) (see below)
P1697
FIG. 15 WARMER SWITCH WIRING
MODEL
OT Upper BLK A to Warmer
to Indicator Lamp
BLK B to Harness P3
OT On/Off Brew Station
BLK A to Indicator Lamp
to Brew Station Warmer
to Timer P3
BLK B to Terminal Block
RT On/Off Brew Station
BLK A to Indicator Lamp
to Timer P3
to Brew Station Warmer
BLK B to Left Front Warmer Switch
to Right Front Warmer Switch
10021 071700
Page 20
SERVICE (cont.)
Warmer Switch(es)
RT: Left Rear, Left Front, & Right Front
R
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WARNING
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FIG. 16 WARMER SWITCHES
Location:
These warmer switches are the two at the left
and the left most one on the right of the base as viewed
from the front, FIG. 16. Their knobs are marked Off/
On/Off/On.
To test these switches, access will also be needed
to the terminal block located in the rear of the brewer.
3. Check the voltage across terminal 1 and the white
or red wire on the terminal block with a voltmeter when the switch is in the "ON" position. Connect the brewer to the power source. The indication must be as described in step 1. Voltage must
not be present across these terminals in the "OFF"
positions.
4. Disconnect the brewer from the power source.
If voltage is present as described, the switch is operating properly.
If voltage is not present as described, replace the
switch.
Removal and Replacement:
1. Remove the knob from the switch.
2. Loosen the 5/8" nut on the switch shaft and push
the switch through the opening.
3. Remove the wires from the switch terminals.
4. Refer to FIG. 17 when reconnecting the wires.
5. Securely mount the new switch onto the housing and reinstall the knob.
Test Procedure:
1. Check the voltage across terminal L1 and the
white or red wire on the terminal block with a
voltmeter. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models and three wire 120/240 volt
models.
c) 100 volts ac for two wire 100 volt models.
2. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #3.
If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness.
FIG. 17 WARMER SWITCH WIRING
Page 20
Page 21
SERVICE (cont.)
Warmer Switch(es)
RT: Right Rear Three Heat Rotary
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P1688
FIG. 18 THREE HEAT WARMER SWITCH
Location:
This switch is the farthest on the right of the base as
viewed from the front, FIG. 18. Its knob is marked
Off/Low/Med/High.
Test Procedure:
1. Check the voltage across terminals L1 and N with
a voltmeter. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models and three wire 120/240 volt
models.
c) 100 volts ac for two wire 100 volt models.
2. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #3.
If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness.
5. Check the voltage across terminals L1 and 2 with
a voltmeter when the switch is in the "High" position. Connect the brewer to the power source.
The indication must be as described in step 1.
Voltage must not be present across these terminals in the "Off", "Low", or "Med" positions.
6. Disconnect the brewer from the power source.
7. Check the voltage across terminals N and 1 with
a voltmeter when the switch is in the "Med" or
"High" positions. Connect the brewer to the power
source. The indication must be as described in
step 1. Voltage must not be present across these
terminals in the "Off" or "Low" positions.
8. Disconnect the brewer from the power source.
9. Check the voltage across terminals N and 2 with
a voltmeter when the switch is in the "Low" position. Connect the brewer to the power source.
The indication must be as described in step 1.
Voltage must not be present across these terminals in the "Off", "Med", or "High" positions.
10. Disconnect the brewer from the power source.
If voltage is present as described, the switch is operating properly.
If voltage is not present as described, replace the
switch.
Removal and Replacement:
1. Remove the knob from the switch.
2. Loosen the 5/8" nut on the switch shaft and push
the switch through the opening.
3. Remove the wires from the switch terminals.
4. Refer to FIG. 19 when reconnecting the wires.
5. Securely mount the new switch onto the housing and reinstall the knob.
NOTE: Switch must be installed right side up.
WHI or RED to Terminal Block
WHI or RED to Right Front
Warmer
WHI or RED to Indicator Lamp
NL1
RED or BLACK to Terminal
Block
3. Check the voltage across terminals L1 and 3 with
a voltmeter when the switch is in the "Low", "Med",
or "High" positions. Connect the brewer to the
power source. The indication must be as described in step 1. Voltage must not be present
across these terminals in the "Off" position.
4. Disconnect the brewer from the power source.
Page 21
12 3
RED to Right Rear Warmer
BRN to Right Rear Warmer
WHI to Right Rear Warmer
P1696
FIG. 19 THREE HEAT WARMER SWITCH WIRING
10021 071700
Page 22
SERVICE (cont.)
c) 100 volts ac for two wire 100 volt models.
Indicator Lamp(s)
R
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FIG. 20 INDICATOR LAMP - MODEL OT
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CAUTION
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:
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PN: 658
L
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P
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1985 BUNN-O-MATIC CORPORATION
H
E
R
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A
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Z
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B
4. Disconnect the brewer from the power source.
If voltage is present, the indicator lamp is operating
properly.
If voltage is not present, replace the indicator lamp.
Removal and Replacement:
1. Compress the clips inside the housing and gently push the indicator lamp through the opening.
2. Remove the wires from the indicator lamp terminals.
3. Refer to FIG. 22 when reconnecting the wires.
4. Push the new indicator lamp firmly into the
opening.
FIG. 21 INDICATOR LAMP - MODEL RT
Location:
The indicator lamps are located beneath their associated warmers, FIG.s 20 and 21.
Test Procedure:
1. Check continuity of the black wire from the switch
to the indicator lamp.
2. Check continuity of the white or red wire from
the indicator lamp to the terminal block.
If continuity is present, proceed to #3.
If continuity is not present, refer to Wiring Diagrams
and check brewer wiring harness.
3. Check for voltage across the indicator lamp ter-
minals. Connect the brewer to the power source.
The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models and three wire 120/240 volt
models.
FIG. 22 INDICATOR LAMP WIRING
MODEL
OT Upper BLK to Warmer Switch
WHI or RED to Warmer
to Harness P2
OT Lower BLK to Start Switch
to On/Off Brew Station Warmer
Switch
WHI or RED to Timer P2
to Brew Station Warmer
RT BLK to Start Switch
to On/Off Brew Station Warmer
Switch
WHI or RED to Right Rear Warmer Switch
to Left Front Warmer
Page 22
Page 23
SERVICE (cont.)
Limit Thermostat
FIG. 23 LIMIT THERMOSTAT
P1698
4. Check for continuity across the limit thermostat
terminals.
If continuity is present as described, the limit thermostat is operating properly.
If continuity 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.
4. Refer to FIG. 24 when reconnecting the wires.
Location:
The limit thermostat is located on the tank lid between
the tank heater terminals, FIG. 23.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Check voltage across the black wire 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 two wire 120 volt models.
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models and three wire 120/240 volt
models.
c) 100 volts ac for two wire 100 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 Diagrams and check the brewer wiring harness.
BLK to Terminal Block
BLU to BLU Lead from
Control Thermostat
FIG. 24 LIMIT THERMOSTAT WIRING
P1984
Page 23
10021 071700
Page 24
SERVICE (cont.)
Solenoid Valve
FIG. 25 SOLENOID VALVE
Location:
The solenoid valve is located below and to the left of
the tank as viewed from the rear, FIG. 25.
Test Procedure:
1. Check the voltage across the white and black
wires with a voltmeter when the On/Off brew station warmer switch is in the upper position and
the start switch is pressed to the lower position
and released. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models,
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models,
c) 100 volts ac for two wire 100 volt models,
for the approximate setting on the brew timer dial
and then return to zero.
2. Disconnect the brewer from the power source.
4. Check the solenoid valve for coil action. Connect the brewer to the power source, place the
On/Off brew station warmer switch in the upper
position, press and release the start switch. Listen carefully in the vicinity of the solenoid valve
for a "clicking" sound as the coil magnet attracts
and after the approximate setting on the brew
timer dial, repels the plunger.
5. 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 or after 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 the solenoid valve coil.
2. Turn off the water supply to the brewer.
3. Remove the bottom pan attached with one or
more 8-32 slotted-head screw(s) beneath the
front of the brewer.
4. Raise the brewer approximately six inches from
the counter top and support the feet on something sturdy.
5. Disconnect the water lines to and from the solenoid valve.
6. Remove the two 10-32 screws holding the solenoid valve to the bracket.
7. Lift-out the solenoid valve.
8. Securely install the new solenoid valve to the
bracket. Check the direction of flow arrow on
the valve. It must be pointing toward the flow
control.
9. Securely fasten the water lines to and from the
solenoid valve.
10. Refer to FIG. 26 when reconnecting the wires.
If voltage is present as described, proceed to #3.
If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness.
3. Check for continuity across the solenoid valve
FIG. 26 SOLENOID VALVE WIRING
Page 24
Page 25
SERVICE (cont.)
Start Switch
FIG. 27 START SWITCH - MODEL OT
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 all wires from the switch terminals.
2. Compress the clips inside the housing and gen-
R
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5
6
:
N
P
tly 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 housing.
4. Refer to FIG. 29 when reconnecting the wires.
P1687
R
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T
N
A
C
E
D
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A
CAUTION
C
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!
:
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C
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WARNING
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.
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.
IL DECANT
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DO NOT BO
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KEEP COMBUSTIBLES AWAY
IO
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P1688
FIG. 28 START SWITCH - MODEL RT
Location:
The start switch is located in the base, below and to
the right of the brew station, FIG.s 27 & 28.
Test Procedure:
1. Disconnect the brewer from the power source
and remove the wires from both terminals of the
start switch.
2. Check for continuity across the two terminals on
the switch when it is held in the lower position.
Continuity must not be present across these terminals in the upper position.
BLU to Timer P1
BLK to Indicator
Lamp
P1697
FIG. 29 START SWITCH WIRING
Page 25
10021 071700
Page 26
SERVICE (cont.)
Tank Heater
FIG. 30 TANK HEATER
Location:
The tank heater is located on the tank lid, FIG. 30.
Test Procedure:
1. Check the voltage across the black and white or
red wires on the tank heater with a voltmeter when
the control thermostat is turned "ON" (fully clockwise). Connect the brewer to the power source.
The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models and three wire 120/240 volt
models.
c) 100 volts ac for two wire 100 volt models.
2. Disconnect the brewer from the power source.
Removal and Replacement:
1. Remove the wires to the tank heater and limit
thermostat terminals.
2. Gently pull the thermostat tube with grommet out
of the tank lid.
3. Remove the sprayhead and sprayhead nut from
the panel on the bottom of the hood.
4. Disconnect the air vent tube from the fitting above
the sprayhead panel.
5. On units with faucet, disconnect the inlet and
outlet tubes from the faucet coil fittings.
6. Loosen the eight 8-32 nuts on the tank lid and
remove the tank lid.
7. Remove the two nuts from the tank heater fittings.
8. Remove the tank heater.
9. Install the new tank heater with new sealing washers on the underside of the tank lid.
10. Securely tighten the nuts to be certain of a watertight seal.
11. Reinstall the tank lid and tighten the eight nuts.
12. Reconnect the air vent tube to the fitting above
the sprayhead panel.
13. Reconnect the inlet and outlet tubes to the faucet coil fittings on units with faucet.
14. Reinstall the sprayhead tube nut and sprayhead.
15. Reinstall the thermostat into the tank lid.
16. Refer to FIG. 31 when reconnecting the wires.
If voltage is present as described, proceed to #3.
If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness.
3. Check for continuity across the terminals of the
tank heater.
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, remove and inspect the heater for cracks in the sheath.
FIG. 31 TANK HEATER WIRING
Page 26
Page 27
SERVICE (cont.) Test Procedures:
1. Disconnect the brewer from the power source.
Thermal Cut-off
Location:
The thermal cut-off is located on the tank heater, FIG.
32.
2. Disconnect the thermal cut-off from the tank
heater terminal and the wiring harness.
3. Check for continuity across the thermal cut-off
terminals using an ohmmeter.
If continuity is present, the thermal cut-off is operating
properly. If continuity is not present as described,
replace the thermal cut-off.
Removal and Replacement:
1. Disconnect the thermal cut-off from the tank
heater terminal and the wiring harness.
2. Remove thermal cut-off and discard.
3. Connect new thermal cut-off to the tank heater
terminal and the wiring harness.
4. Refer to FIG. 32 when reconnecting wires.
FIG. 32 THERMAL CUT-OFF
P1698
Page 27
10021 071700
Page 28
THERMOSTAT
BLK
SCHEMATIC WIRING DIAGRAM OT
(FAUCET OPTION ONLY)
THERMAL CUT-OFF
BLK
BLKBLU
TANK HEATER
LIMIT
SW. &
THERMOSTAT
GREEN
WHI (OT15 & 20)
RED (OT35)
NL1
L2
WHI
P3
BLK
BLK
BLK
BLK
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
120 VOLTS AC 2 WIRE
120/240 VOLTS AC 3 WIRE
SINGLE PHASE
60 HZ
BLK
BLK
BLK
BLK
P3
CONNECTOR.
"KEEP WARM" HEATER
WHI
WHI
UPPER WARMER
BREW STATION WARMER
P1
BLU BLU/BLK
WHI/GRNWHI/BLU
BLK
T5
T1
10278.0000E 7/00© 1988 BUNN-O-MATIC CORPORATION
T3
BREW
TIMER
SOL
T4
T2
P2
WHI WHI
WHI
WHI
WHI
WHI
P2
Page 28
10021 071700
Page 29
BLK
BLK
BLK
SCHEMATIC WIRING DIAGRAM OT
SW. &
THERMOSTAT
"KEEP WARM" HEATER
WHI
UPPER WARMER
BREW STATION WARMER
P1
BLU BLU/BLK
BLK
T1
PNK
TAN
PNK
PNK
BLK
50W
130W
130W
T5
BREW
TIMER
GRY
TAN
TAN
T3
GRY
GRY
T4
T2
3500W
TANK HEATER
WHI/GRNWHI/BLU
SOL
THERMOSTAT
P3
BLK
LIMIT
BLK
BLK
SELECTOR
CONTROL
GRN YEL RED
BLU
BLK
BLK WHI
BLK
BLK
P3
BOARD
2/3 F1/3
GREEN
WHI
P2
P2
WHI
P1, P2, & P3
ARE PINS OF A
POLARIZED
THREE-PIN
CONNECTOR.
GRINDER
INTERFACE
CONNECTORS
RED
L2
WHIWHI
WHI
WHI
WHI
WHI
NL1
120/240 VOLTS AC
3 WIRE
SINGLE PHASE
10280.0000D 7/00 © 1988 BUNN-O-MATIC CORPORATION
Page 29
10021 071700
Page 30
L1
BLK
SCHEMATIC WIRING DIAGRAM OTA
GRN/YEL
LIMIT
THERMOSTAT
BLU
SW. &
THERMOSTAT
BLK
TANK HEATER
L2
RED/BLK
BLK
BLK
P3
BLK
BLK
BLK
BLK
BLK
BLK
BLK
P3
RED/BLK
UPPER WARMER
BREW STATION WARMER
P1
BLU BLU/BLK
BLK
240 VOLTS AC
T5
2 WIRE
SINGLE PHASE
T1
BREW
TIMER
50-60 HZ
10282.0000B 7/00 © 1988 BUNN-O-MATIC CORPORATION
T3
T4
T2
SOL
RED/BLK
WHI/GRNWHI/BLU
P2
P1, P2, & P3 ARE
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR
P2
WHI
RED/BLK
RED/BLK
RED/BLK
RED/BLK
Page 30
10021 071700
Page 31
SCHEMATIC WIRING DIAGRAM OT25B
L1
BLK
BLK
P3 P2
BLK
BLK
BLK
100 VOLTS AC
LIMIT
THERMOSTAT
BLU
BLK
BLK
BLK
BLK
BLK
READY INDICATOR
BLU
SW. & THERMOSTAT
BLK
P1
BLU BLU/BLK
P3
BLK
TANK HEATER
RED
T1
2 WIRE
SINGLE PHASE
50-60 HZ
10635.0000B 7/00 © 1991 Bunn-O-Matic Corporation
BLK
BLK
REDBLK
UPPER WARMER
BREW STATION WARMER
SOL
T5
T3
BREW
TIMER
T4
T2
GRN/YEL
K1
K1 N.OK1 N.O
P1, P2, & P3 ARE
PINS OF A
WHI/GRNWHI/BLU
POLARIZED
THREE-PIN
CONNECTOR.
P2
N
RED
RED
REDRED
RED
RED
REDWHI
Page 31
10021 071700
Page 32
L1
SCHEMATIC WIRING DIAGRAM OT35B
READY INDICATOR
BLU
BLK
GRN/YEL
L2
BLK
P3
BLK
BLK
200 VOLTS AC
2 WIRE
SINGLE PHASE
LIMIT
THERMOSTAT
BLU
BLK
BLK
BLK
BLK
BLK
SW. & THERMOSTAT
BLK
BLK
BLU
P3
P1
BLK
50-60 HZ
10637.0000B 7/00 © 1991 Bunn-O-Matic Corporation
BLK
RED
UPPER WARMER
BREW STATION WARMER
BLU/BLK
T5
T1
T3
BREW
TIMER
T4
T2
TANK HEATER
RED
WHI/GRNWHI/BLU
SOL
P2
P1, P2, & P3 ARE
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR.
P2
WHI
RED
RED
RED
RED
RED
Page 32
10021 071700
Page 33
L1
BLK
WHI
SCHEMATIC WIRING DIAGRAM RT
(FAUCET OPTION ONLY)
THERMAL CUT-OFF
BLK
BLK
LIMIT
THERMOSTAT
SW. &
THERMOSTAT
BLU
"KEEP WARM" HEATER
GREEN
TANK HEATER
WHI
N
L2
RED
BLK
L1 1
ON
BLK
BLK
BLK
BLK
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
BLK
OFF
ON
L1 1
OFF
ON
P3
CONNECTOR.
OPTIONAL FLASHING INDICATOR SYSTEM
L.E.D.
OFF
OFF
L1 1
ON
GRY
PIN
ON
BLU
BLK
OFF
P1
P1
BLU/BLK
T1
INDICATOR
TIMER
ON
WARMER
WHI/BLU
T5
T3
BREW
TIMER
WHI/GRN
SOL
T4
T2
4
3
2
1
WHI/RED
LEFT REAR WARMER
LEFT FRONT WARMER
RIGHT FRONT WARMER
WHI
P2
WHI
WHI
WHI
WHI
WHIBLK BLK
WHIBLK BLK
WHIBLK BLK
OFF
WHI
MED
LOW
120/240 VOLTS AC
3 WIRE
HIGH
OFF
SINGLE PHASE
60 HZ
10277.0000D 7/00 © 1988 BUNN-O-MATIC CORPORATION
RIGHT REAR WARMER
BRN
213
NL
RED
WHI
RED
Page 33
10021 071700
Page 34
L1
BLK
SCHEMATIC WIRING DIAGRAM RTA
GRN/YEL
LIMIT
THERMOSTAT
BLU
SW. &
THERMOSTAT
BLK
TANK HEATER
L2
RED
BLK
BLK
BLK
1
ON
L1
ON
BLK
OFF
OFF
1
BLK
OFF
L1
BLK BLK
ON
BLK
BLK
OFF
P1
BLU
BLU/BLK
P3
BLK
T1
LEFT REAR WARMER
1
ON
L1
ON
WHI
MED
BLK
OFF
OFF
WARMER
WHI/BLU
T5
T3
BREW
TIMER
1
ON
2
T4
T2
LEFT FRONT WARMER
BLK
BRN
P1, P2, & P3 ARE
WHI/GRN
SOL
CONNECTOR.
WHI
RIGHT FRONT WARMER
RIGHT REAR WARMER
3
RED
PINS OF A
POLARIZED
THREE-PIN
P2
RED
RED
RED
RED
RED
RED
BLK
240 VOLTS AC
SINGLE PHASE
2 WIRE
50-60 HZ
LOW
HIGH
OFF
L
10283.0000C 7/00 © 1988 BUNN-O-MATIC CORPORATION
N
Page 34
10021 071700
Page 35
SCHEMATIC WIRING DIAGRAM RT25B
L1
LIMIT
BLK
BLK RED
BLK
BLK BLK
THERMOSTAT
OFF
L1
ON
BLK
BLK
1
ON
BLU
K1 N.O
BLK
BLK
OFF
READY INDICATOR
BLU
SW. & THERMOSTAT
P1
BLU
P3
BLU/BLK
BLK
T1
LEFT REAR WARMER
BLK
TANK HEATER
WARMER
WHI/BLU
T5
T3
BREW
TIMER
BLK
T4
T2
REDBLK
SOL
K1
K1 N.O
WHI/GRN
GRN/YEL
P1, P2, & P3 ARE
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR.
WHI
P2
N
RED
RED
RED
RED
RED
OFF
BLK BLK
BLK BLK
BLK
L1
ON
LOW
OFF
OFF
WHI
MED
1
ON
L1
ON
HIGH
OFF
OFF
LEFT FRONT WARMER
1
ON
BRN
213
L
100 VOLTS AC
2 WIRE
SINGLE PHASE
50-60 HZ
10634.0000D 7/00 © 1991 Bunn-O-Matic Corporation
RED
RED
RIGHT FRONT WARMER
RIGHT REAR WARMER
RED
N
RED
Page 35
10021 071700
Page 36
SCHEMATIC WIRING DIAGRAM RT35B
L1
LIMIT
BLK
BLK
BLK BLK
BLK BLK
BLK BLK
THERMOSTAT
OFF
L1
ON
OFF
BLK
BLK
1
ON
L1
ON
BLU
BLK
BLK
OFF
OFF
READY INDICATOR
BLU/BLK
T5
T1
ON
BLK
BREW
TIMER
BLU
SW. & THERMOSTAT
P1
BLU
P3
BLK
LEFT REAR WARMER
1
ON
OFF
L1 1
ON
WARMER
WHI/BLU
T3
LEFT FRONT WARMER
T4
T2
BLK
GRN/YEL
TANK HEATER
WHI/GRN
SOL
RIGHT FRONT WARMER
P1, P2, & P3 ARE
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR.
P2
WHI
L2
RED
RED
RED
RED
RED
RED
RED
BLK
200 VOLTS AC
2 WIRE
SINGLE PHASE
50-60 HZ
OFF
WHI
1
MED
LOW
HIGH
OFF
10636.0000D 7/00 © 1991 Bunn-O-Matic Corporation
L
BRN
2
N
RIGHT REAR WARMER
RED
3
RED
Page 36
10021 071700
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