Bunn OL Instruction and safety manual

OL & RL
10020.0000F 3/00 © 1989 BUNN-O-MATIC CORPORATION
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: [phone] FAX: [phone]
BUNN
®
OPERATING & SERVICE MANUAL
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:658 1985BUNN-O-MATIC CORPORATION
FUNNELCONTENTS
AREHOT
!
WARNING
!
HIGHHEATWARMER
DONOTBOILDECANTERDRY
KEEPCOMBUSTIBLESAWAY
FAILURETOCOMPLYRISKS
GLASSFAILURE/HOTLIQUID
BURNSANDFIREHAZARD
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985 BUNN-O-MATIC CORPORATION
FUNNELCONTENTS
AREHOT
!

Page 2
CONTENTS Introduction............................................................... 2
User Notices .............................................................. 3
Electrical Requirements............................................. 4
Plumbing Requirements ............................................ 4
Initial Set-Up.............................................................. 5
Operating Controls..................................................... 6
Coffee Brewing .......................................................... 7
Cleaning..................................................................... 7
Troubleshooting......................................................... 8
Service....................................................................... 12
Wiring Diagrams........................................................ 26
INTRODUCTION
Thisequipmentwillbrewahalf-gallon batchofcoffee intoanawaitingdecanteratthepressofabutton. The
OL has two and the RL has five warmers to keep the beverage at the right temperature, on the RL 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-MaticCorp.(“Bunn”)warrantstheequipmentmanufacturedbyittobecommerciallyfreefromdefects
in material and workmanship existing at the time of manufacture and appearing within one year from the date of
installation. In addition:
1.)Bunnwarrantselectroniccircuitand/orcontrolboardstobecommerciallyfreefromdefectsinmaterialand
workmanship for two years from the date of installation.
2.)Bunnwarrantsthecompressoronrefrigerationequipmenttobecommerciallyfreefromdefectsinmaterial
and workmanship for two years from the date of installation.
3.)Bunnwarrantsthatthegrindingburrsoncoffeegrindingequipmentwillgrindcoffeetomeetoriginalfactory
screensieveanalysisforthreeyearsfromdateofinstallationorfor30,000poundsofcoffee,whichevercomesfirst.
Thiswarrantydoesnotapplytoanyequipment,componentorpartthatwasnotmanufacturedbyBunnorthat,
inBunn’sjudgement,hasbeenaffectedbymisuse,neglect,alteration,improperinstallationoroperation,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
MERCHANTABILITYOR FITNESS FORA PARTICULAR PURPOSE.Theagents,dealersoremployeesof Bunnare
not authorized to make modifications to this warranty or to make additional warranties that are binding on Bunn.
Accordingly,statementsbysuchindividuals,whetheroralorwritten,donotconstitutewarrantiesandshouldnot
be relied upon.
The Buyer shall give Bunn prompt notice of any claim to be made under this warranty by telephone at (217)
529-6601orbywritingtoPostOfficeBox3227,Springfield,Illinois,62708-3227.IfrequestedbyBunn,theBuyer
shall ship the defective equipment prepaid to an authorized Bunn service location. If Bunn determines, in its sole
discretion,that theequipment doesnotconform tothewarranty, Bunnshall repair theequipment withnocharge
forparts 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.
THEBUYER’SREMEDYAGAINSTBUNNFORTHEBREACHOFANYOBLIGATIONARISINGOUTOFTHESALE
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.
InnoeventshallBunnbeliableforanyotherdamageorloss,including,butnotlimitedto,lostprofits,lostsales,
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.
10020 030800

Page 3
00656.0000 00688.0000
Fill water tank before turning -on
thermostat or connecting appliance
to power source.
Do not use near combustibles.
Follow national/local electrical codes.
Electrically ground the chassis.
Use only on a properly protected
circuit capable of the rated load.
FAILURE TO COMPLY RISKS EQUIPMENT
DAMAGE, FIRE, OR SHOCK HAZARD
READ THE ENTIRE OPERATING MANUAL
BEFORE BUYING OR USING THIS PRODUCT
THIS APPLIANCE IS HEATED WHENEVER
CONNECTED TO A POWER SOURCE
00831.0000F 3/98 © 1988 BUNN-O-MATIC CORPORATION
WARNING
!
This equipment is to 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).
WARNING
!
HIGH HEATWARMER
DO NOT BOIL DECANTER DRY
KEEP COMBUSTIBLES AWAY
FAILURETO COMPLY RISKS
GLASS FAILURE/HOT LIQUID
BURNS AND FIRE HAZARD
00831.0000 00658.0000
10020 111598
USER NOTICES
Carefullyread and follow all notices on theequipment and in this manual. They were writtenfor your protection.
All notices on the equipment should be kept in good condition. Replace any unreadable or damaged labels.

Page 4
BUNN
OFF
HI
ELECTRICAL REQUIREMENTS
CAUTION - Do not connect the brewer to the power source until specified in Initial Set-Up.
MODELS OL15 & 20 require 2-
wire, grounded service rated
120 volts ac, 15 or 20 amp re-
spectively, single phase, 60 Hz.
NEUTRAL
WHITE
L1 BLACK
208 or 240V.A.C.
120V.A.C.
120V.A.C.
L2 RED
MODELS OL35 & RL35 require
3-wire, grounded service rated
120/208or120/240voltsac,20
amp, single phase, 60 Hz.
120V.A.C.
NEUTRAL
WHITE
L1 BLACK
Electrical Hook-Up
Model OL15 has an attached cordset.
Models OL20, OL35, & RL35, proceed as follows:
CAUTION – Improper electrical installation will dam-
age electronic components.
1. Anelectrician mustprovide electrical service as
specified.
2. Using a voltmeter, check the voltage and color
codingofeachconductorattheelectricalsource.
3. Removethetoppanelandrotatethecontrolther-
mostatknob fully counterclockwiseto 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. Ifplumbingisto 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. In-
stall 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.
NOTE - Bunn-O-Matic recommends 1/4" copper tub-
ing 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 facili-
tatemovingthebrewertocleanthecountertop. Bunn-
O-Maticdoesnotrecommendtheuseofasaddlevalve
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 Build-
ing Officials and Code Administrators Inter-
national, Inc. (BOCA) and the Food Service
Sanitation Manual of the Food and Drug Ad-
ministration (FDA).
MODELS OLA, RLA, OL35B &
RL35B require 2-wire,
grounded service rated 240
voltsacor200voltsac,20amp
single phase, 50 Hz.
200 OR 240V.A.C.
L1 BLACK
L2 RED
P1478
MODEL OL25B & RL25B
requires2-wire,grounded
servicerated100voltsac,
20 amp single phase, 50
Hz.
100V.A.C.
NEUTRAL
RED
L1 BLACK
10020 111598

Page 5
PLUMBING REQUIREMENTS (Cont.)
Plumbing Hook-Up
Model OL15 has an attached water strainer, proceed to step 2.
Models OL20, OL35, & RL35, proceed as follows:
1. Remove the rear panel and bottom pan. Run the long piece of tubing from the strainer (supplied) under the
brewerand attachitto thewaterinlet fitting onthe bottom bracket. Reinstallthe bottom panandrear 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 setup, except when
specified in the instructions.
1. Remove the top panel.
2. Rotate the control thermostat knob fully coun-
terclockwisetothe"OFF"positionandreplacethe
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
theOn/Offbrewstationwarmerswitchtheupper
position,andmomentarilypressthestartswitch.
Water will begin flowing into the tank. When
water stops flowing into the tank, initiate a sec-
ondandathirdbrewcycle. Duringthisthirdbrew
cycle the tank will fill to its capacity and the ex-
cesswillflowfromthesprayhead,outofthefun-
nel, and into the decanter.
NOTE - The On/Off brew station warmer switch must
beintheupperpositiontoinitiateandcompleteabrew
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 top panel.
9. Rotate the control thermostat knob fully clock-
wise to the "ON" position and replace the panel.
10. Connectthebrewertothepowersourceandwait
approximately twenty minutes for the water in
thetanktoheattothepropertemperature. 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. Allowthewaterinthetanktoreheattotheproper
temperature.
14. Placeanemptydecanteronthewarmerandpress
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, disconnect the brewer from the power
source and remove the top panel.
16. Add or remove washers to the float on the level
switchasrequired.Addingwashersincreasesthe
volume,removingwashersdecreasesit.Replace
the top panel, connect the brewer to the power
source, start, and measure another brew cycle.
17. Repeat steps 13-16 until 64 oz water volume is
achieved.
P1712 P1478
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATICCORPORATION
FUNNELCONTENTS
AREHOT
!
BUNN
OFF
HI
10020 111598

Page 6
WARNING
!
HIGHHEATWARMER
DONOTBOILDECANTERDRY
KEEPCOMBUSTIBLESAWAY
FAILURETOCOMPLYRISKS
GLASSFAILURE/HOTLIQUID
BURNSANDFIREHAZARD
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILED DRY
.HEATED WHEN EMPTY
.USED ON HIGH FLAME
.OR EXPOSED ELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATICCORPORATION
FUNNELCONTENTS
AREHOT
!
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILED DRY
.HEATED WHEN EMPTY
.USED ON HIGH FLAME
.OR EXPOSED ELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATICCORPORATION
FUNNELCONTENTS
AREHOT
!
OPERATING CONTROLS
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.
NOTE - The On/Off brew station warmer switch must be in the upper position to initiate and complete a brew
cycle.
B. On/Off Brew Station Warmer Indicator Lamp
Glows whenever the On/Off brew station warmer switch is in the upper position showing that the warmer is
on and that the automatic brew cycle can be started.
C. Start Switch
Starts a brew cycle when the On/Off brew station warmer switch is in the upper position.
MODEL OL
D. Upper Warmer Switch
Placingthe switch intheupper position supplies
power to the upper warmer. Placing the switch in the
lower position cuts power to the upper warmer.
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.
G. Left Front Warmer Rotary Switch
Rotating the knob to the "ON" position supplies
power to the left front warmer. Rotating the knob to
the"OFF" position cuts power totheleft frontwarmer.
H. Right Front Warmer Rotary Switch
Rotating the knob to the "ON" position supplies
powerto theright front warmer. Rotating theknob to
the"OFF"positioncutspowertotherightfrontwarmer.
I. Right Rear Warmer Three Heat Rotary Switch
Rotating the knob to the "LO", "MED", or "HIGH"
positions supply power to the right rear warmer. Ro-
tatingtheknob tothe "OFF"positioncutspowertothe
rightrearwarmer. The“HIGH”positionof thisswitch
makes the warmer capable of boiling water.
MODEL RL
D E
A B C
F G A B C H I
P1712
P1713
10020 111598

Page 7
COFFEE BREWING
Start each brew cycle with an empty, clean, half-gallon decanter.
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.
Wheninserted properly, no more than two inches of spring shouldbevisible. Sawbackand forth five or six
times.
NOTE- Inhardwaterareas,thismayneedtobedonedaily. Itwillhelppreventlimingproblemsinthebrewerand
takes less than a minute.
10020 111598

Page 8
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. Water Level Switch and Overflow
Safety Switch
Remedy
(A)Connectthebrewertothepower
source.
(B) Check the terminal block for the
proper voltages.
(C) Check circuit breaker/fuse.
Checkplumbingandshut-offvalves.
(A) Direction of flow arrow must be
pointing towards brewer.
(B) Remove the strainer and check
for obstructions. Clear or replace.
RefertoService-WaterLevelSwitch
andOverflowSafetySwitchfortest-
ing procedures. See page 25.
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,andrepairofelectricalequipmentshouldbeperformedonlybyqualifiedservicepersonnel.
•Allelectriccomponents have 120 volt ac voltage on their terminals. Shorting of terminals or the application
of external voltages may result in equipment failure.
•Intermittentoperationofelectronicequipmentisunlikely. Componentfailurewillnormallybe 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.
•Thisbrewerisheatedatalltimesunlessdisconnectedfromthepowersource. Keepawayfromcombustibles.
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
10020 111598

Page 9
TROUBLESHOOTING (cont.)
Problem
Brew cycle will not start. (cont.)
Water flows into fill basin continu-
ously (On/Off brew station warmer
switch "OFF").
Water flows into fill basin continu-
ously (On/Off brew station warmer
switch "ON").
Water is not hot.
Decanter warmer is not hot.
Probable Cause
4. On/Off Brew Station Warmer
Switch
5. Start Switch
6. Relay
7. Solenoid Valve
1. Solenoid Valve
1. Start Switch
1. Limit Thermostat
CAUTION
Donoteliminateorbypasslimitther-
mostat. Use only B.O.M. replace-
ment part #29329.1000
2. Control Thermostat
3. Tank Heater
1. Warmer Switches
2. Decanter Warmers
Remedy
Refer to Service - On/Off Brew Sta-
tionWarmerSwitch for testing pro-
cedures. See page 16.
Refer to Service - Start Switch for
testing procedures. See page 19.
Refer to Service - Relay for testing
procedures. See page 23.
RefertoService-SolenoidValvefor
testing procedures. See page 22.
RefertoService-SolenoidValvefor
testing procedures. See page 22.
Refer to Service - Start Switch for
testing procedures. See page 19.
Refer to Service - Limit Thermostat
fortestingprocedures. Seepage21.
Refer to Service - Control Thermo-
stat for testing procedures. See
page 13.
Refer to Service - Tank Heater for
testing procedures. See page 24.
(A)TheWarmerSwitch(es)mustbe
in the "ON" position for the warmer
to operate.
(B) Refer to Service - Warmer
Switch(es) for testing procedures.
See pages 16,17, & 18.
RefertoService-Warmersfor test-
ingprocedures. Seepages14&15.
10020 111598

Page 10
TROUBLESHOOTING (cont.)
Problem
Spitting or unusual steaming from
sprayhead.
Warmerplatestoohot,solenoidcoil
smoking, or water in tank heats ex-
cessively fast.
Inconsistent beverage level in de-
canter.
Dripping from sprayhead.
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
surfacescan initiate corrosive reac-
tions resulting in serious leaks.
1. Brewer wired to wrong voltage
1. Improper water pressure
2. Syphon system
1. Syphon system
2. Solenoid Valve
Remedy
Refer to Service - Control Thermo-
stat for testing procedures. See
page 13.
Inspectthetankassemblyforexces-
sive lime deposits. Delime as re-
quired.
Refer to Electrical Requirements -
Page 4.
Check the operating water pressure
to the brewer. It must be between
20 and 90 psi.
Water should flow freely from the
sprayhead and then stop abruptly.
Thebrewermustbelevelfromfront-
to-back to syphon properly.
Water should flow freely from the
sprayhead and then stop abruptly.
Thebrewermustbelevelfromfront-
to-back to syphon properly.
RefertoService-SolenoidValvefor
testing procedures. See page 22.
10020 111598

Page 11
TROUBLESHOOTING (cont.)
Problem
Beverage overflows decanter.
Weak beverage.
Brewer is making unusual noises.
Probable Cause
1. Beverage left in decanter
1. Type of paper filters
2. Coffee
3. Sprayhead
4. Funnel loading
5. Water temperature
1. Solenoid Valve
2. Plumbing lines
3. Water supply
Remedy
The brew cycle should be started
only with an empty decanter under
the funnel.
BUNN®paperfiltersshouldbeused
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.
Place a funnel over an empty de-
canter on the warmer beneath the
sprayhead. Place the On/Off brew
station warmer switch in the upper
position,press thestartswitch, and
checkthe water temperature imme-
diately below the sprayhead with an
accuratethermometer. The reading
should not be less than 195°F. Ad-
just the control thermostat slightly
clockwisetoincreasethewatertem-
perature.
The nut on top of the solenoid valve
must be tight or it will vibrate dur-
ing operation.
Plumbing lines should not rest on
the counter top.
(A) The brewer must be connected
to a cold water line.
(B) Water pressure to the brewer
must not be higher than 90 psi. In-
stallaregulatorifnecessarytolower
the working pressure to approxi-
mately 50 psi. 10020 111598

Page 12
WARNING
!
HIGHHEATWARMER
DONOTBOILDECANTERDRY
KEEPCOMBUSTIBLESAWAY
FAILURETOCOMPLYRISKS
GLASSFAILURE/HOTLIQUID
BURNSANDFIREHAZARD
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILED DRY
.HEATED WHEN EMPTY
.USED ON HIGH FLAME
.OR EXPOSED ELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATICCORPORATION
FUNNELCONTENTS
AREHOT
!
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATICCORPORATION
FUNNELCONTENTS
AREHOT
!
FIG. 1 ACCESS PANELS
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
sourcebeforetheremovalofanypanelorthereplace-
ment of any component.
The control thermostat, solenoid valve and relay
are located under the top cover or top warmer hous-
ing, FIG. 1, attached with three #8-32 slotted-head
screws.
The base warmer(s), switch(es), indicator lamp,
start switch, tank "keep warm" heater and terminal
block 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 assembly. Access is gained by removing
the rear panel, FIG. 1 attached with two #8-32 slotted
head screws.
Onthe model OL, the upper warmer, switch, and
associated indicator lamp are located on the remov-
able top warmer housing, FIG. 1.
WARNING - Inspection, testing, and repair of electri-
cal equipment should be performed only by qualified
servicepersonnel. Thebrewershouldbedisconnected
from the power source when servicing, except when
electrical tests are required and the test procedure
specificallystates to connect the brewer to the power
source. Contents
Control Thermostat...............................................13
Warmer(s)
OL: Brew Station & Upper............................................. 14
RL: Left Rear, Left Front, Brew Station, & Right Front .. 14
RL: Right Rear Three Heat ............................................ 15
Warmer Switch(es)
OL:On/Off Brew Station & Upper.................................. 16
RL:On/Off Brew Station................................................ 16
RL:Left Rear, Left Front, & Right Front Rotary ............. 17
RL:Right Rear Three Heat Rotary ................................. 18
Start Switch..........................................................19
Indicator Lamp(s).................................................20
Limit Thermostat ..................................................21
Solenoid Valve ......................................................22
Relay.....................................................................23
Tank Heater...........................................................24
Over Flow Safety Switch .......................................25
Wiring Schematics............................................... 26
P1712 P1713
10020 111598

Page 13
FIG. 2 CONTROL THERMOSTAT
FIG. 3 THERMOSTAT WIRING
SERVICE (cont.)
Control Thermostat
Location:
The control thermostat is located under the top
cover or top warmer housing, FIG. 2.
To test the control thermostat, access will also
be needed to the tank heater located in the bottom of
the tank assembly.
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
brewertothepowersource. Theindicationmust
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.
Ifvoltageisnotpresentasdescribed,refertotheWir-
ing Diagrams and check the brewer wiring harness.
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
thecontrolthermostatisturned"ON"(fullyclock-
wise). Connect the brewer to the power source.
The indication must be as described in step 2.
Voltage must not be indicated across these ter-
minalswhenthethermostatisturned"OFF"(fully
counterclockwise).
5. Disconnect the brewer from the power source.
Ifvoltageispresentasdescribed,thecontrolthermo-
stat is operating properly.
Ifvoltageisnotpresentasdescribed,replacethecon-
trol thermostat.
Removal and Replacement:
1. Remove the top cover or top warmer housing
from the brewer to gain access.
2. Remove both wires from the control thermostat
terminals.
3. Remove the thermostat bulb by firmly pulling-
up 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 con-
trol thermostat to the bracket.
5. Fasten the new control thermostat to the com-
ponent bracket.
NOTE- Makesurethatthe capillarytubeis awayfrom
any electrical termination and is not kinked.
6. Slide the grommet to the red mark on the capil-
lary tube.
7. Insert the bulb through the hole in the tank lid
andpress the grommet firmly and evenly so that
the groove in the grommet fits into the tank lid.
8. Carefully bend the capillary tube so that the tube
andbulbinsidethetankareinaverticalposition.
9. Refer to FIG. 3 when reconnecting the wires.
10. Readjustthe control thermostat dial as required.
BLU to Limit Thermostat
BLK to Tank Heater
P1478
P1098
BUNN
OFF
HI
10020 111598

Page 14
WARNING
!
HIGHHEATWARMER
DONOTBOILDECANTERDRY
KEEPCOMBUSTIBLESAWAY
FAILURETOCOMPLYRISKS
GLASSFAILURE/HOTLIQUID
BURNSANDFIREHAZARD
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATICCORPORATION
FUNNELCONTENTS
AREHOT
!
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATIC CORPORATION
FUNNELCONTENTS
AREHOT
!
FIG. 4 WARMERS
FIG. 5 WARMERS FIG. 6 WARMER WIRING
SERVICE (cont.)
Warmer(s)
OL: Brew Station & Upper
RL: Left Rear, Left Front, Brew Station, & Right Front
Location:
OL:Oneof thewarmersis beneaththebrewfunnel
and the other is on the top lid, FIG. 4.
RL: These warmers include the one beneath the
brewfunnel, theoneson therightand leftofthe brew
station, and the one above and to the left of the brew
station as viewed from the front, FIG. 5.
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 ac-
cessible for testing.
4. Checkfor continuity from the switch to theblack
wire at the warmer element.
If continuity is present as described, proceed to #5.
5. Check for continuity from the wire terminal of
the white or red wire to the splice or indicator
lamp using the chart below.
If continuity is present as described, proceed to #6.
If continuity is not present as described, refer to the
Wiring Diagrams and check the brewer wiring har-
ness.
6. Checkfor continuity acrossthetwo terminals on
the warmer.
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 both wires from the warmer.
4. Refer to FIG. 6 when reconnecting the wires.
5. Place the new warmer into the brewer and se-
curely attach it using the #4-40 screws.
MODEL
OL Upper WHI OR RED to Indicator Lamp
OL Brew Station WHI OR RED to Indicator Lamp
to Terminal Block
RL Left Rear WHI OR RED to Terminal Block
to Brew Station Warmer
RL Left Front WHI OR RED to Indicator Lamp
RL Brew Station WHI OR RED to Relay P2
to Left Rear Warmer
RL Right Front WHI OR RED to Right Rear Warmer Switch
WHI or RED (see below)
BLK to Warmer Switch
P1712
P1713 P1692
10020 111598

Page 15
FIG. 7 THREE HEAT WARMER
FIG. 8 THREE HEAT WARMER WIRING
SERVICE (cont.)
Warmer
RL: 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 har-
ness.
5. Check for continuity across the two outside ter-
minals on the warmer. Then across one of the
outside terminals and the center terminal. Fi-
nally, 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. 8 when reconnecting the wires.
5. Place the new warmer into the brewer and se-
curely attach it using the #4-40 screws.
Location:
Thethree heat warmer isaboveand to the rightofthe
brew station as viewed from the front, FIG. 7.
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 ac-
cessible for testing.
4. Check for continuity of the red wire, the white
wire, then the brown wire from the switch to the
warmer element.
RED to Right Rear Warmer
Switch 3
WHI to Right Rear Warmer
Switch 1
BRN to Right Rear Warmer
Switch 2
P1713
P1693
WARNING
!
HIGHHEATWARMER
DONOTBOILDECANTERDRY
KEEPCOMBUSTIBLESAWAY
FAILURETOCOMPLYRISKS
GLASSFAILURE/HOTLIQUID
BURNSANDFIREHAZARD
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATICCORPORATION
FUNNELCONTENTS
AREHOT
!
10020 111598

Page 16
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATICCORPORATION
FUNNELCONTENTS
AREHOT
!
FIG. 9 WARMER SWITCHES
FIG. 10 WARMER SWITCHES FIG. 11 WARMER SWITCH WIRING
SERVICE (cont.)
Warmer Switch(es)
OL:On/Off Brew Station & Upper
RL:On/Off Brew Station
If voltage is present as described, proceed to #4.
Ifvoltageisnotpresentasdescribed,refertotheWir-
ing Diagrams and check the brewer wiring harness.
4. Check the voltage across the other switch termi-
nal 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
brewertothepowersource. Theindicationmust
be as described in step 2. Voltage must not be
presentacrosstheseterminalsinthelowerposi-
tion.
5. Disconnect the brewer from the power source.
If voltage is present as described the switch is oper-
ating properly.
If voltage is not present as described, replace the
switch.
Removal and Replacement:
1. Compress the clips inside the housing and gen-
tly push the switch through the opening.
2. Remove the wires from the switch terminals.
3. Refer to FIG. 11 when reconnecting the wires.
4. Push the new switch firmly into the opening.
Location:
These switches are located beneath and to the
left of their associated warmers as viewed from the
front, FIG.s 9 and 10.
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 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.
3. Disconnect the brewer from the power source.
MODEL
OL Upper BLK A to Warmer
to Indicator Lamp
BLK B to Harness P3
OL On/Off Brew Station
BLK A to Indicator Lamp
to Brew Station Warmer
to Level Switch
BLK B to Terminal Block
RL On/Off Brew Station
BLK A to Indicator Lamp
to Level Switch
to Brew Station Warmer
BLK B to Left Front Warmer Switch
to Right Front Warmer Switch
BLK (A) (see below)
BLK (B) (see below)
P1712
P1713
P1697
WARNING
!
HIGHHEATWARMER
DONOTBOILDECANTERDRY
KEEPCOMBUSTIBLESAWAY
FAILURETOCOMPLYRISKS
GLASSFAILURE/HOTLIQUID
BURNSANDFIREHAZARD
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATICCORPORATION
FUNNELCONTENTS
AREHOT
!
10020 111598

Page 17
WARNING
!
HIGHHEATWARMER
DONOTBOILDECANTERDRY
KEEPCOMBUSTIBLESAWAY
FAILURETOCOMPLYRISKS
GLASSFAILURE/HOTLIQUID
BURNSANDFIREHAZARD
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATICCORPORATION
FUNNELCONTENTS
AREHOT
!
FIG. 12 WARMER SWITCHES
FIG. 13 WARMER SWITCH WIRING
SERVICE (cont.)
Warmer Switch(es)
RL: Left Rear, Left Front, & Right Front
Location:
These warmer switches are the two at the left
andtheleftmostoneontherightofthebaseasviewed
from the front, FIG. 12. Their knobs are marked Off/
On/Off/On.
Totesttheseswitches,accesswillalsobeneeded
tothe terminal block located in the rear of the brewer.
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 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.
2. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #3.
Ifvoltageisnotpresentasdescribed,refertotheWir-
ing Diagrams and check the brewer wiring harness.
3. Checkthevoltageacrossterminal1andthewhite
or red wire on the terminal block with a voltme-
ter when the switch is in the "ON" position. Con-
nectthebrewertothepowersource. Theindica-
tionmustbeasdescribedinstep1. Voltagemust
notbepresentacrosstheseterminalsinthe"OFF"
positions.
4. Disconnect the brewer from the power source.
If voltage is present as described, the switch is oper-
ating properly.
If voltage is not present as described, replace the
switch.
Removal and Replacement:
1. Remove the knob from the switch.
2. Loosenthe5/8"nutontheswitchshaftandpush
the switch through the opening.
3. Remove the wires from the switch terminals.
4. Refer to FIG. 13 when reconnecting the wires.
5. Securely mount the new switch onto the hous-
ing and reinstall the knob.
MODEL
RT Left Rear BLK 1 to Warmer
BLK L1 to Left Front Warmer Switch
RT Left Front BLK 1 to Warmer
BLK L1 to Left Rear Warmer Switch
to Brew Station Warmer Switch
RT Right Front BLK 1 to Warmer
BLK L1 to Terminal Block
to Brew Station Warmer Switch
L1
1
BLK (L1) (see below)
BLK (1) (see below)
P1713
P1695
10020 111598

Page 18
WARNING
!
HIGHHEATWARMER
DONOTBOILDECANTERDRY
KEEPCOMBUSTIBLESAWAY
FAILURETOCOMPLY RISKS
GLASSFAI LURE/HOT LIQUID
BURNSAND FIRE HAZARD
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATICCORPORATION
FUNNELCONTENTS
AREHOT
!
FIG. 14 THREE HEAT WARMER SWITCH
FIG. 15 THREE HEAT WARMER SWITCH WIRING
SERVICE (cont.)
Warmer Switch(es)
RL: Right Rear Three Heat Rotary
5. CheckthevoltageacrossterminalsL1and2with
avoltmeterwhentheswitchis inthe"High"posi-
tion. Connect the brewer to the power source.
The indication must be as described in step 1.
Voltage must not be present across these termi-
nals 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. Connectthebrewertothepower
source. The indication must be as described in
step1. Voltagemustnotbepresentacrossthese
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" posi-
tion. Connect the brewer to the power source.
The indication must be as described in step 1.
Voltage must not be present across these termi-
nals in the "Off", "Med", or "High" positions.
10. Disconnect the brewer from the power source.
If voltage is present as described, the switch is oper-
ating properly.
If voltage is not present as described, replace the
switch.
Removal and Replacement:
1. Remove the knob from the switch.
2. Loosenthe5/8"nutontheswitchshaftandpush
the switch through the opening.
3. Remove the wires from the switch terminals.
4. Refer to FIG. 15 when reconnecting the wires.
5. Securely mount the new switch onto the hous-
ing and reinstall the knob.
NOTE: Switch must be installed right side up.
Location:
This switch is the farthest on the right of the base as
viewed from the front, FIG. 14. Its knob is marked
Off/Low/Med/High.
Test Procedure:
1. CheckthevoltageacrossterminalsL1andNwith
a voltmeter. 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.
2. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #3.
Ifvoltageisnotpresentasdescribed,refertotheWir-
ing Diagrams and check the brewer wiring harness.
3. CheckthevoltageacrossterminalsL1and3with
avoltmeterwhentheswitchisinthe"Low","Med",
or "High" positions. Connect the brewer to the
power source. The indication must be as de-
scribed in step 1. Voltage must not be present
across these terminals in the "Off" position.
4. Disconnect the brewer from the power source.
NL1
12 3
WHI or RED to Terminal Block
WHI or RED to Right Front
Warmer
WHI or RED to Indicator Lamp
RED or BLACK to Terminal
Block
RED to Right Rear Warmer
BRN to Right Rear Warmer
WHI to Right Rear Warmer
P1713
P1696
10020 111598

Page 19
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETO COMPLY RISKS INJURY
PN:6581985BUNN-O-MATICCORPORATION
FUNNELCONTENTS
AREHOT
!
FIG. 17 START SWITCH - MODEL RL
FIG. 16 START SWITCH - MODEL OL
FIG. 18 START SWITCH WIRING
SERVICE (cont.)
Start Switch
Location:
The start switch is located in the base, below and to
the right of the brew station, FIG.s 16 & 17.
Test Procedure:
1. Disconnect the brewer from the power source
and remove the wires from both terminals of the
start switch.
2. Checkfor continuity acrossthetwo terminals on
the switch when it is held in the lower position.
Continuity must not be present across these ter-
minals in the upper position.
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-
tly push the switch through the opening.
3. Pushthenewswitchintotheopeningandspread
the clips to hold the switch captive in the hous-
ing.
4. Refer to FIG. 18 when reconnecting the wires.
BLU to Relay P1
BLK to Relay P3
& Level Switch
P1712
P1713
P1697
WARNING
!
HIGHHEATWARMER
DONOTBOILDECANTERDRY
KEEPCOMBUSTIBLESAWAY
FAILURETOCOMPLYRISKS
GLASSFAILURE/HOTLIQUID
BURNSANDFIREHAZARD
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATICCORPORATION
FUNNELCONTENTS
AREHOT
!
10020 111598

Page 20
WARNING
!
HIGHHEATWARMER
DONOTBOILDECANTERDRY
KEEPCOMBUSTIBLESAWAY
FAILURETOCOMPLYRISKS
GLASSFAILURE/HOTLIQUID
BURNSANDFIREHAZARD
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATICCORPORATION
FUNNELCONTENTS
AREHOT
!
CAUTION
DISCARDDECANTER
IF:
.CRACKED
.SCRATCHED
.BOILEDDRY
.HEATEDWHENEMPTY
.USEDONHIGHFLAME
.OREXPOSEDELECTRIC
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
PN:6581985BUNN-O-MATIC CORPORATION
FUNNELCONTENTS
AREHOT
!
FIG. 21 INDICATOR LAMP WIRING
FIG. 19 INDICATOR LAMPS - MODEL OL
FIG. 20 INDICATOR LAMP - MODEL RL
SERVICE (cont.)
Indicator Lamp(s)
c) 100 volts ac for two wire 100 volt models.
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 gen-
tly push the indicator lamp through the opening.
2. Removethewiresfromtheindicatorlamptermi-
nals.
3. Refer to FIG. 21 when reconnecting the wires.
4. Push the new indicator lamp firmly into the
opening.
Location:
The indicator lamps are located beneath their associ-
ated warmers, FIG.s 19 and 20.
Test Procedure:
1. Checkcontinuityoftheblackwirefromtheswitch
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.Connectthebrewertothe powersource.
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.
MODEL
OL Upper BLK to Warmer Switch
WHI or RED to Warmer
to Harness P2
OL Lower BLK to On/Off Brew Station Warmer
Switch
WHI or RED to Relay P2
to Brew Station Warmer
RL BLK to On/Off Brew Station Warmer
Switch
WHI or RED to Right Rear Warmer Switch
to Left Front Warmer
WHI or RED
(see below)
BLK (see below)
P1712
P1713
P1694
10020 111598