SERVICE & REPAIR MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
41711.0001B 05/12 ©2009 Bunn-O-Matic Corporation
C, CS, CT, CWTF,
CRT, CRTF Series
Including
DV, MV, APS/TC/TS,
Single CW & Twins
Supercedes Service Manual: 41711.0000
Page 2
41711.1 030912
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:
1) Airpots, thermal carafes, decanters, GPR servers, iced tea/coffee dispensers, MCP/MCA pod brewers thermal servers
and Thermofresh servers (mechanical and digital)- 1 year parts and 1 year labor.
2) All other equipment - 2 years parts and 1 year labor plus added warranties as specified below:
a) Electronic circuit and/or control boards - parts and labor for 3 years.
b) Compressors on refrigeration equipment - 5 years parts and 1 year labor.
c) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis - parts
and labor for 4 years or 40,000 pounds of coffee, whichever comes first.
These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be
commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the
applicable warranty period. This warranty does not apply to any equipment, component or part that was not manufactured
by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect, alteration, improper installation or operation,
improper maintenance or repair, non periodic cleaning and descaling, equipment failures related to poor water quality,
damage or casualty. In addition, the warranty does not apply to replacement of items subject to normal use including but
not limited to user replaceable parts such as seals and gaskets. This warranty is conditioned on the Buyer 1) giving BUNN
prompt notice of any claim to be made under this warranty by telephone at (217) 529-6601 or by writing to Post Office
Box 3227, Springfield, Illinois 62708-3227; 2) if requested by BUNN, shipping the defective equipment prepaid to an
authorized BUNN service location; and 3) receiving prior authorization from BUNN that the defective equipment is under
warranty.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR ORAL, EX-
PRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of BUNN are not authorized to make
modifications to this warranty or to make additional warranties that are binding on BUNN. Accordingly, statements by such
individuals, whether oral or written, do not constitute warranties and should not be relied upon.
If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its exclusive op-
tion while the equipment is under warranty, shall either 1) provide at no charge replacement parts and/or labor (during the
applicable parts and labor warranty periods specified above) to repair the defective components, provided that this repair
is done by a BUNN Authorized Service Representative; or 2) shall replace the equipment or refund the purchase price for
the equipment.
THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF THIS
EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AT BUNN’S SOLE OPTION
AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND.
In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost profits, lost sales, loss of
use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute equipment, facilities
or services, or any other special, incidental or consequential damages.
392, AutoPOD, AXIOM, BrewLOGIC, BrewMETER, Brew Better Not Bitter, BrewWISE, BrewWIZARD, BUNN Espress, BUNN
Family Gourmet, BUNN Gourmet, BUNN Pour-O-Matic, BUNN, BUNN with the stylized red line, BUNNlink, Bunn-OMatic,
Bunn-O-Matic, BUNNserve, BUNNSERVE with the stylized wrench design, Cool Froth, DBC, Dr. Brew stylized Dr. design,
Dual, Easy Pour, EasyClear, EasyGard, FlavorGard, Gourmet Ice, Gourmet Juice, High Intensity, iMIX, Infusion Series, In-
tellisteam, My Café, Phase Brew, PowerLogic, Quality Beverage Equipment Worldwide, Respect Earth, Respect Earth with
the stylized leaf and coffee cherry design, Safety-Fresh, savemycoffee.com, Scale-Pro, Silver Series, Single, Smart Funnel,
Smart Hopper, SmartWAVE, Soft Heat, SplashGard, The Mark of Quality in Beverage Equipment Worldwide, ThermoFresh,
Titan, trifecta, Velocity Brew, A Partner You Can Count On, Air Brew, Air Infusion, Beverage Bar Creator, Beverage Profit
Calculator, Brew better, not bitter., BUNNSource, Coffee At Its Best, Cyclonic Heating System, Daypart, Digital Brewer
Control, Nothing Brews Like a BUNN, Pouring Profits, Signature Series, Tea At Its Best, The Horizontal Red Line, Ultra are
either trademarks or registered trademarks of Bunn-O-Matic Corporation.
Page 3
41711.1 052009
Contents
Trouble Shooting .............................................................................................................. 4
Component Access ........................................................................................................ 10
Control Thermostat ........................................................................................................ 10
Electronic Thermostat .................................................................................................... 11
ON/OFF Switch ............................................................................................................... 12
Start Switch (Brew) ........................................................................................................ 13
Solenoid (Inlet) .............................................................................................................. 14
Tank Heater .................................................................................................................... 16
Fill Basin ........................................................................................................................ 16
Tank Heater Switch ........................................................................................................ 18
Thermal Cut-Off ............................................................................................................. 20
Coil/Faucet ..................................................................................................................... 21
Limit Thermostat ............................................................................................................ 22
Recovery Booster ........................................................................................................... 23
Timer (Early Model) ....................................................................................................... 24
Freshness Timer (Early Models)..................................................................................... 25
Digital Brew Timer (Late Model) .................................................................................... 26
Warmer Elements........................................................................................................... 28
Schematic Wiring Diagrams .......................................................................................... 29
Page 4
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,andrepairofelectricalequipmentshouldbeperformedonlybyqualiedserviceperson-
nel.
• Allelectroniccomponentshave120voltacandlowvoltagedcpotentialontheirterminals.Shortingof
terminals or the application of external voltages may result in board failure.
• Intermittentoperationofelectroniccircuitboardsisunlikely.Boardfailurewillnormallybepermanent.If
an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a
terminal or crimp.
• Solenoidremovalrequiresinterruptingthewatersupplytothevalve.Damagemayresultifsolenoidsare
energized for more than ten minutes without a supply of water.
• Theuseoftwowrenchesisrecommendedwheneverplumbingttingsaretightenedorloosened.Thiswill
help to avoid twists and kinks in the tubing.
• Makecertainthatallplumbingconnectionsaresealedandelectricalconnectionstightandisolated.
• Thisbrewerisheatedatalltimes.Keepawayfromcombustibles.
WARNING – • Exerciseextremecautionwhenservicingelectricalequipment.
• Unplugthebrewerwhenservicing,exceptwhenelectricaltestsarespecied.
• Followrecommendedserviceprocedures
• Replaceallprotectiveshieldsorsafetynotices
PROBLEM
Brew cycle will not start
PROBABLE CAUSE
1. No water
2. No power or incorrect voltage
to the brewer
REMEDY
Water lines and valves to the
brewer must be open.
(A1) Check the terminal block for
120 volts across the black and
white terminals on two wire 120
volt brewers.
(A2) Check the terminal block
for 120 volts across the red and
white terminals and the black
and white terminal on three wire
120/240 volt brewers.
(A3) Check the terminal block for
200 volts on "B Series" brewers
or 240 volts on "A Series" brew-
ers across the red and black
terminals.
(B) Check circuit breakers or
fuses.
41711.1 052009
Page 5
TROUBLESHOOTING (cont.)
Brew cycle will not start (cont.)
Water is not hot
PROBABLE CAUSE
REMEDY
3. ON/OFF Switch
4. Start Switch
5. Timer
6. Solenoid Valve
7. Water strainer/flow control
(.222 GPM) Early models
1. Tank Heater Switch
2. (A) Limit Thermostat
(B) Thermal Cut-Off (Brewers
with Faucet)
CAUTION - Do not eliminate
or bypass limit thermostat or
thermal cut-off. Use only BOM
replacement parts.
3. Control Thermostat
4. Tank Heater
Refer to Service - ON/OFF
Switch for testing.
Refer to Service - Start Switch
for testing procedures.
Refer to Service - Timer for test-
ing procedures.
Refer to Service - Solenoid Valve
for testing procedures.
(A) Direction of flow arrow must
be pointing towards brewer.
(B) Remove the strainer/flow
control and check for obstruc-
tions. Clear or replace.
Refer to Service - Tank Heater
Switch for testing procedures.
Refer to Service - Limit Ther-
mostat for testing procedures.
Thermal Cut-Off for testing
procedures.
Refer to Service - Control Ther-
mostat for testing procedures.
Refer to Service - Tank Heater
for testing procedures.
PROBLEM
41711.1 052009
Page 6
TROUBLESHOOTING (cont.)
Inconsistent beverage level in
dispenser
Consistently low beverage level
in the dispenser
Spitting or excessive steaming
1. Strainer /flow control (.222
GPM) Early models.
2. Syphon System
3. Lime Build-up
CAUTION - Tank and tank
components should be delimed
regularly depending on local wa-
ter conditions. Excessive min-
eral build-up on stainless steel
surfaces can initiate corrosive
reactions resulting in serious
leaks.
4. Water Pressure
1. Timer
2. Strainer/flow Control (.222
GPM)
1. Lime Build-up
CAUTION - Tank and tank
components should be delimed
regularly depending on local wa-
ter conditions. Excessive min-
eral build-up on stainless steel
surfaces can initiate corrosive
reactions resulting in serious
leaks.
(A) Direction of flow arrow must
be pointing towards the brewer.
(B) Remove the strainer/flow
control and check for obstruc-
tion. Clear or replace.
The brewer must be level or
slightly lower in front to syphon
properly.
Inspect the tank assembly for
excessive lime deposits. Delime
as required.
The water pressure to the
brewer must be at least 20 psi
(138 kPa).
Timer must be set for at least
two minutes and fifteen seconds.
(A) Direction of flow arrow must
be pointing towards brewer.
(B) Remove the strainer/flow
control and check for obstruc-
tions. Clear or replace.
Inspect tank assembly for exces-
sive lime deposits. Delime as
required.
PROBLEM
PROBABLE CAUSE
REMEDY
41711.1 052009
Page 7
TROUBLESHOOTING (cont.)
Spitting or excessive steaming
(cont.)
Dripping from sprayhead
Water flows into tank continu-
ously (ON/OFF Switch "ON")
Water flows into tank continu-
ously (ON/OFF Switch "OFF")
Beverage overflows dispenser
2. Control Thermostat
1. Syphon System
2. Lime Build-up
CAUTION - Tank and tank com-
ponents should be delimed
regularly depending on local
water conditions. Excessive min-
eral build-up on stainless steel
surfaces can initiate corrosive
reactions resulting in serious
leaks.
3. Solenoid Valve
1. Timer
1. Solenoid Valve
1.Dispenser
2. Timer
3. Solenoid Valve
Refer to Service - Control Ther-
mostat for testing procedures.
The brewer must be level or
slightly lower in front to syphon
properly.
Inspect the tank assembly for
excessive lime deposits. Delime
as required.
Remove the solenoid valve and
clear any obstructions. Rebuild
or replace the valve if necessary.
Refer to Service - Timer for test-
ing procedures.
Remove the Solenoid Valve and
clean any obstruction. Rebuild
or replace the valve if necessary.
The dispenser must be com-
pletely empty before starting a
brew cycle.
Refer to Service - Timer for test-
ing procedures.
Remove the Solenoid Valve and
clean any obstruction. Rebuild
or replace the valve if necessary.
PROBLEM
PROBABLE CAUSE
REMEDY
41711.1 052009
Page 8
TROUBLESHOOTING (cont.)
Weak beverage
Dry coffee grounds remain in
the funnel
Brewer is making unusal noises
1. Filter Type
2. Coffee Grind
3. Sprayhead
4. Funnel Loading
5. Water Temperature
1. Funnel Loading
1. Solenoid
2. Plumbing Lines
3. Water Supply
PROBLEM PROBABLE CAUSE
BUNN® paper filters must be used
for proper extraction.
A fine or drip grind must be used
for proper extraction.
A six-hole stainless steel spray-
head must be used for proper
extraction.
The BUNN® paper filter must be
centered in the funnel and the
bed of ground leveled by gentle
shaking.
Place an empty funnel on an empty
dispenser beneath the sprayhead.
Initiate a brew cycle and check the
water temperature immediately
below the sprayhead with a ther-
mometer. The reading should not
be less than 195°F (76°C). Adjust
the control thermostat to increase
the water temperature. Replace if
necessary.
The BUNN® paper filter must be
centered in the funnel and the
bed of grounds leveled by gently
shaking.
The nut on the solenoid must
be tight or it will vibrate during
operation.
Plumbing lines should not resting
on the counter top.
(A) The brewer must be connected
to a cold water line.
(B) Water pressure to the brewer
must not exceed 90 psi (620 kPa).
Install a regulator if necessary to
lower the working pressure to ap-
proximately 50 psi (345 kPa).
REMEDY
41711.1 052009
Page 9
TROUBLESHOOTING (cont.)
Brewer is making unusal noises
(cont.)
Low beverage serving tempera-
ture
4. Tank Heater
1. Warmer
2. ON/OFF Switch
Remove and clean lime off the
tank heater.
Refer to Service - Warmer ele-
ment for testing procedures.
Refer to Service - ON/OFF
Switch for testing procedures.
PROBLEM
PROBABLE CAUSE
REMEDY
41711.1 052009
Page 10
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.
WARNING - Inspection, testing, and repair of electri-
cal equipment should be performed only by qualified
service personnel. The brewer should be unplugged
when servicing, except when electrical tests are re-
quired and the test procedure specifically states to
plug-in the brewer.
COMPONENT ACCESS
WARNING - Disconnect the brewer from the power
source before the removal of any panel or the replace-
ment of any component.
All components are accessible by the removal of
the top cover, front inspection panel, warmer plate(s)
and rear utility cover (Twins only).
CONTROL THERMOSTAT
FIG. 10-1 CONTROL THERMOSTAT
Location:
The control thermostat is located inside the trunk
on the upper left side of the component bracket.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the leads from control thermostat.
41711.1 052009
3. Gently remove the capillary bulb and grommet
from the tank.
4. Check for continuity across the thermostat termi-
nals. The indication must be:
a) Continuity with knob rotated fully clockwise.
b) No continuity with knob rotated fully counter-
clockwise. NOTE: First style does not have the ON/
OFF feature, simply check continuity.
If continuity is not present as described, replace control
thermostat.
If continuity is present as described, refer to the wiring
diagrams and check the brewer wiring harness.
Removal and Replacement:
1. Disconnect the control thermostat wires.
2. Remove the thermostat capillary bulb by firmly
pulling up on the capillary at the tank lid. This will
disengage the grommet from the tank lid.
3. Remove the one #8-32 screw securing the control
thermostat to the component bracket inside the
trunk.
4. Slide the grommet to the line 4.5" above the bulb
on the new capillary tube.
5. Insert the capillary bulb through the hole in the
tank lid and press the grommet firmly and evenly
so that the groove in the grommet fits into the tank
lid.
6. Carefully bend the capillary tube so that the tube
and bulb inside the tank are in the vertical posi-
tion.
NOTE - The capillary tube must be clear of any electri-
cal termination and not kinked.
7. Using #8-32 screw(s), secure the control thermo-
stat to the component bracket inside the trunk.
8. For first type thermostat, refer to Wiring Diagrams
when reconnecting thermostat wires.
9. Adjust the control thermostat as required.
NOTE: First type will only turn approximately one
turn. Clockwise to the stopper is approximately
180° F, maximum counterclockwise to stopper is
approximately 200° F.
Later types will be approximately 200° F when
turned maximum clockwise. Turning it counter-
clockwise until it clicks will turn off (open con-
tacts).
Page 11
SERVICE (cont.)
OPTIONAL ELECTRONIC THERMOSTAT (ERT):
The ERT is located inside the trunk on the upper left
side of the component bracket.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Gently remove the temperature sensor and grom-
met from the tank.
3. Check voltage across the blue wire from limit
thermostat and the white wire at the terminal
block. Connect the brewer to the power source.
The indication must be: 120Vac.
If voltage is not present as described, refer to the wiring
diagrams and check the brewer wiring harness
If voltage is present as described, proceed to #4.
4. Disconnect the brewer from the power source.
5. With the temperature sensor and grommet still out
of the tank, check voltage across the black wire
to the heater and the white wire at the terminal
block. Connect the brewer to the power source.
The indication must be: 120Vac.
If voltage is not present as described, replace ERT.
If voltage is present as described, the ERT is function-
ing properly.
Removal and Replacement:
1. Disconnect the control thermostat wires.
2. Remove the temperature sensor by firmly pulling-
up on the metal sheath at the tank lid. This will
disengage the grommet from the tank lid.
3. Remove the one #8-32 screw securing the ERT to
the component bracket inside the trunk.
4. Slide the grommet to the top of the sheath.
5. Insert the temperature sensor through the hole
in the tank lid and press the grommet firmly and
evenly so that the groove in the grommet fits into
the tank lid.
6. Using the #8-32 screw, secure the ERT to the
component bracket inside the trunk.
7. For first type thermostat, refer to Wiring Diagrams
when reconnecting ERT wires.
8. Adjust the ERT as required.
FIG 11-1 THERMOSTAT TERMINALS
First Type
Second Type
Third Type
41711.1 052009
ERT
NOTE: The ERT has a range of 170° - 210°F. Use care
not to set it too high or boiling could occur.
Page 12
Location:
The ON/OFF switch(s) are located on the front of
the hood.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Viewing the switch from the back remove the white
or red wire from the upper terminal and the black
wire from the center terminal.
3. Check the voltage across the white wire or red wire
and the black wire 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 to 240 volts ac for two wire 200 or 240 volt
models.
4. Disconnect the brewer from the power source.
If voltage is present as described, reconnect the white
or red wire and proceed to #5.
If voltage is not present as described, refer to the Wiring
Diagrams and check the brewer wiring harness.
5. With the black wire removed, remove the wire from
the lower terminal.
6. Check for continuity across the center and lower
terminal with the switch in the "ON" position.
Continuity must not be present when the switch
is in the "OFF" position.
If continuity is present as described, reconnect the
black wire to the center terminal and the remaining
wire to the lower terminal.
If continuity is not present as described, replace the
switch.
SERVICE (cont.)
ON/OFF WARMER SWITCH
FIG. 12-1 ON/OFF WARMER SWITCHES
FIG. 12-2 WARMER SWITCH TERMINALS
Removal and Replacement:
1. Remove the wires from the switch terminals.
2. Compress the clips inside the hood and gently
push the switch through the opening.
3. Push the new switch into the opening and spread
the clips to hold switch in the hood.
4. Refer to Fig.7 when reconnecting the wires.
(3) WHI to Neutral or RED to L2
(2)BLKtoL1
(1) To Warmer
WARMER SWITCH
(1) LOAD (WARMER)
(2) LINE (L1)
(3) NEUTRAL (L2)
41711.1 052009
Page 13
SERVICE (cont.)
START SWITCHES
Location: CRT/CRTF
On brewers w/out fresh light, the start switch is
located in the right front of the hood.
On brewers w/fresh light, the start switch is located
on the right side of the hood.
Location: CT/CWT/CWTF/TWINS
On most "CT" series brewers, the start switch is
located in the front of the hood.
On some "convertible" or "CS" brewers, the start
switch is located on either the right or left side of the
hood.
NOTE: Optional on the left and right side warmer
housings on 0/6 TWINS, connected in parallel to front
mounted start switches.
Test Procedure:
1. Disconnect the brewer from the power supply.
2. Disconnect the blue wire and the white/red wire
from the switch terminals.
3. Check for continuity across the two terminals on
the switch when it is held in the "pressed-in" posi-
tion. Continuity must not be present across these
terminals in the released position.
If continuity is present as described, reconnect the blue
wire and the white/red to the switch terminals.
If continuity is not present as described, replace the
switch.
Removal and Replacement:
1. Remove the blue wire and white/red from the start
switch.
2. Remove round retaining nut from the front of
the switch and remove switch and internal tooth
lockwasher from the inside of the hood.
3. Push new switch with internal tooth lockwasher
through the hole in the hood and secure with round
retaining nut.
4. Refer to Fig. 11 when reconnecting the wires.
FIG. 13-1 START SWITCH
FIG. 13-2 START SWITCH TERMINALS
BLU to Timer P1
WHI/RED to
Timer P3
(3) WHI to Neutral or RED to L2
(2)BLKtoL1
START SWITCH
CT SERIES
CRT/CRTF
CRT/CRTF
CT/CWT/CWTF/TWINS
41711.1 052009
Page 14
SERVICE (cont.)
SOLENOID VALVES
Location:
The solenoid valve is located inside the trunk on
the lower center part of the component bracket.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the white and black wires from the
solenoid valve. With the "ON/OFF" switch in the
"ON" upper position press the start switch.
3. Check the voltage across the white and black 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 to 240 volts ac for two wire 200 or 240 volt
models.
4. Disconnect the brewer from the power source,
If voltage is present as described, proceed to #5
If voltage is not present as described, refer to Wiring
Diagrams and check brewer wiring harness.
5. Check for resistance across the solenoid valve coil
terminals.
If resistance is present as described, reconnect the
white and black wire from the timer.
If resistance is not present as described, replace the
solenoid valve.
6. Check the solenoid valve for coil action. Connect
the brewer to the power source. With "ON/OFF"
switch in the "ON' upper position press start switch
and listen carefully in the vicinity of the solenoid
valve for a" clicking" sound as the coil magnet
attracts.
7. Disconnect the brewer from the power source.
If the sound is heard as described and water will not
pass through the solenoid valve, there may be a block-
age in the water line before the solenoid valve or, the
solenoid valve may require inspection for wear, and
removal of waterborne particles.
If the sound is not heard as described, replace the
solenoid valve.
Removal and Replacement:
1. Remove the white and black from the solenoid
valve.
2. Turn off the water supply to the brewer.
3. Disconnect the water lines to and from the solenoid
valve.
4. Remove the two #8-32 screws securing the sole-
noid mounting bracket to the component bracket.
Remove solenoid bracket and solenoid valve as an
assembly.
5. Remove the two #10-32 screws and lockwash-
ers securing the solenoid valve to the solenoid
bracket.
6. Using two #10-32 screws and lockwashers in-
stall new solenoid valve on solenoid mounting
bracket.
7. Using two #8-32 screws install solenoid valve and
bracket to the component bracket.
8. Securely fasten the water lines to and from the
solenoid valve.
9. Refer to Fig. 9 when reconnecting the wires.
FIG. 14-1 SOLENOID VALVE
FIG. 14-2 SOLENOID VALVE TERMINALS
WHI from Timer
BLKfromTimer
41711.1 052009
EARLY MODELS LATE MODELS
Page 15
41711.1 052009
120VAC-1.18K
240VAC-3.76K
120VAC - 247
240VAC - 757
120VAC - 334
SERVICE (cont.)
SOLENOID VALVES
Disassembly:
1. Use of the basin wrench 01060.0000 is recom-
mended for disassembly of early style valves as
illustrated below.
2. Disconnect from power source and turn off the
water supply to the brewer.
3. Disconnect the water lines to and from the solenoid
valve.
4. Remove the two #8-32 screws securing the sole-
noid mounting bracket to the component bracket.
Remove solenoid bracket and solenoid valve as an
assembly.
5. Remove the two #10-32 screws and lock wash-
ers securing the solenoid valve to the solenoid
bracket.
6. Disassemble the valve according to the illustrations
that correspond to the particular valve you have.
7. On early style valves, leave the fittings installed
in the base to use as leverage. DO NOT CLAMP
THE BASE WITH LOCKING PLIERS AS THIS CAN
CAUSE DAMAGE!
8. Refer to Illustrated Parts Catalogs for replacement
solenoids and repair/rebuild kits.
FIG. 15-1 FIRST STYLE
FIG. 15-2 THIRD STYLE
FIG. 15-2 SECOND STYLE
Page 16
SERVICE (cont.)
TANK HEATER
Location:
The tank heater is located inside the tank and
secured to the tank lid.
Test Procedures:
1. Disconnect the brewer from the power supply.
2. Check the voltage across the black and white wires
on 120 volt models or the black and red wires for
120/240 volt models, 200 volt models and 240
volt models with a voltmeter. Connect the brewer
to the power source. The indication must be:
a) 120 volts ac for two wire 120 volt 20 amp
models .
b) 240 volts ac for three wire 120/240 volt mod-
els.
c) 200 to 240 volts ac for two wire 200 or 240 volt
models.
3. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #4
If voltage is not present as described, refer to the Wir-
ing Diagrams and check wiring harness.
4. Disconnect the wires from the tank heater termi-
nals.
5. Check resistance value across tank heater terminals
and compare to chart.
FIG.16-2TANKHEATER
FILL BASIN
FIG.16-1TANKHEATER
Disassembly:
1. Use of the basin wrench 01060.0000 is recom-
mended for removal of the fill basin.
2. Disconnect from power source and turn off the
water supply to the brewer.
3. Remove top cover.
4. Use the basin wrench (as shown above) turning
counterclockwise to remove inlet fitting.
5. Lift basin off of the tank inlet.
6. Use new inlet gasket when reinstalling.
41711.1 052009
Page 17
1800W-120V 7.40 - 8.70
1850W-220V 24.40 -28.40
3500W-200V 10.70 -12.36
3500W-240V 15.36 -17.90
HEATER RESISTANCE
If resistance is present as described, reconnect the
wires, the tank heater is ok.
If resistance is not present as described, replace the
tank heater.
NOTE- If any resistance is read between sheath and
either terminal, remove and inspect heater for cracks
in the sheath.
Removal and Replacement:
1. Disconnect the water supply tube from the fill
basin.
2. Remove the tank inlet fitting securing the fill basin
to the tank lid, remove fill basin and tank inlet
gasket. Set all three parts aside for reassembly.
3. On brewers with faucet, shut-off water supply
to the brewer and disconnect the inlet and outlet
water lines to the faucet coil assembly.
4. Disconnect the black wire on the limit thermostat
from the tank heater switch. On late model brew-
ers also disconnect the blue wire from the limit
thermostat to the control thermostat.
5. Disconnect the black wire and the white or red
wire from the tank heater terminals.
6. Remove sprayhead and the hex nut securing the
sprayhead tube to the hood. Set aside for reas-
sembly.
7. Remove the eight #8-32 nuts securing the tank lid
to the tank.
8. Remove the tank lid with limit thermostat, spray-
head tube, tank heater, coil assembly and control
thermostat w/bracket (early models only).
9 Remove the two hex nuts securing the tank heater
to the tank lid. Remove tank heater with gaskets
and discard.
10. Install new tank heater with gaskets on the tank
lid and secure with two hex nuts.
SERVICE (cont.)
TANK HEATER (Cont.)
FIG.17-2TANKHEATERTERMINALS
11. Install tank lid with limit thermostat, sprayhead
tube, tank heater, coil assembly (brewers with
faucet) and control thermostat with bracket (early
brewers only) using eight #8-32 hex nut.
12. Reconnect the inlet and outlet water lines to the
faucet coil assembly.
13. Secure sprayhead tube to hood using a hex nut.
14. Install sprayhead.
15. Reconnect the wires to the limit thermostat, tank
heater and control thermostat. See limit thermostat
and control thermostat sections in this manual
when reconnecting wires.
16. Install fill basin, secure with tank inlet fitting and
gasket. Insert water supply line through grommet
in fill basin.
17. Refer to Fig.13 when reconnecting the tank heater
wires.
WHI to Terminal Block
(White Insert on 230V
Two Wire Models)
RED to Terminal Block
(Red Insert on 120/240V
Three Wire Models or
200V and 240V Two
Wire Models
BLK to Control Ther-
mostat (Brewers W/
Out Faucet)
ThermalCut-OfftoBLK
from Control Ther-
mostat (Brewers W/
Faucet)
41711.1 052009
FIG.17-1TANKHEATERRESISTANCE
TERMINAL TO SHEATH - INFINITE (OPEN)
Page 18
SERVICE (cont.)
TANK HEATER SWITCH
Location:
The tank heater switch is located on the rear of
the brewer on the upper left side of the trunk.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Disconnect the black wire from the limit thermo-
stat.
3. With the tank heater switch in the "ON" position
and with a voltmeter, check the voltage between
the black wire removed from the limit thermostat
and the white wire or red wire on the tank heater.
Connect the brewer to the power source. The
indication must be:
a) 120 volts ac on two wire 120 volt models.
b) 240 volts ac on three wire 120/240 volt mod-
els.
c) 200 to 240 volts ac on 200 volt or 240 volt
models.
4. Disconnect the brewer from the power source.
If voltage is not present as described, proceed to
#5.
If voltage is present as described, the switch is work-
ing properly.
5. With the tank heater switch in the "ON" upper posi-
tion, check for continuity between the black wire
removed from the limit thermostat and the black
insert on the terminal block. Continuity should
not be present in the "OFF" lower position.
If continuity is present as described, the tank heater
switch is operating properly.
If continuity is not present as described, replace the
tank heater switch.
Removal and Replacement:
1. Shut off and disconnect the incoming water supply
to the brewer.
2. On automatic brewers gently remove the fill tube
from back of fill basin.
3. Remove the tank inlet fitting securing fill basin the
tank lid. Remove fill basin and gasket. Set all three
parts aside for reassembly.
4. On brewers with faucets, disconnect the water
supply to coil assembly and remove the tube from
the tank to the faucet.
5. Remove sprayhead and hex nut securing sprayhead
tube to the hood. Set aside for reassembly.
6. Disconnect the wires on the limit thermostat and
the tank heater and the control thermostat (early
models).
7. Gently pull the thermostat sensor and grommet
from the tank lid.
8. Insert a tube to the bottom of the tank and syphon
ALL of the water out.
9. Remove the two #8-32 screws securing the tank
assembly to the hood.
10. Lift tank and components out as an assembly and
set aside for reassembly.
11. Disconnect the two black wires from the tank heater
switch.
12. Remove the plastic facenut, hex facenut and the
switch indicator/guard bracket that secures tank
heater switch to the rear of the brewer. Remove
switch and discard.
13. Insert new tank heater switch through the hole in
the upper left rear of the trunk and secure with
switch indicator/guard bracket, hex facenut and
plastic facenut.
14. Reconnect the two black wires to the tank heater
switch terminals.
FIG18-1TANKHEATERSWITCH
41711.1 052009
Page 19
SERVICE (cont.)
TANK HEATER SWITCH (cont.)
FIG.19-1TANKHEATERSWITCHTERMINALS
15. Set tank assembly inside the hood on mounting
brackets and secure with two #8-32 screws.
16. Reconnect the wires to the limit thermostat, tank
heater and the control thermostat. Refer to limit
thermostat, tank heater and control thermostat sec-
tions in this manual when reconnecting wires.
17. Brewers with faucet reinstall the faucet tube and
reconnect the water supply tube to the coil as-
sembly.
18. Secure the sprayhead tube to the hood using hex
nut.
19. Install sprayhead.
20. Install fill basin, inlet gasket and secure to tank lid
with tank inlet fitting.
21. Carefully install water fill tube into the back of
the fill basin.
22. Reconnect and turn on the incoming water sup-
ply.
23. Refer to Fig. 15 when reconnecting the wires.
BLKtoLimitThermostat
BLKtoTerminalBlock
(Black Insert)
41711.1 052009
Page 20
Location:
The thermal cut-off (TCO) is a thermal fuse located
above the tank lid, connected to the tank heater.
NOTE: Installed only on tanks with coil faucet.
CE models have an additional TCO connected to the
other heater terminal.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect both ends of the TCO.
3. Check for continuity across TCO with an ohm-
meter.
If continuity is present as described, the TCO is op-
erating properly.
If continuity is not present as described, replace the
TCO.
THERMAL CUT-OFF (Brewers W/Faucet)
Fig. 20-1 THERMAL CUT-OFF
FIG. 20-3 TCO TERMINALS
SERVICE (cont.)
Removal and Replacement:
1. Disconnect both ends of the TCO.
2. Install new thermal cut-off.
3. Refer to Fig. 17 when reconnecting wires.
Thermal Cut-Off from Tank
Heater to BLK Lead from
Control Thermostat
WHI or RED to
Terminal Block
FIG. 20-4 TCO TERMINALS
Thermal Cut-Off from Tank
Heater to BLK Lead from
Control Thermostat
RED to
Heater Switch
120V, 120/240V
230V CE
FIG. 20-2 TESTING TCO
41711.1 052009
Page 21
SERVICE (cont.)
41711.1 052009
COIL/FAUCET
Location:
The coil for the faucet is located in the tank.
Operation:
Water inside the coil is separate from the brewing water
and is always under line pressure. Brewing water in
the tank heats the submerged coil. Use of a coil faucet
during a brew cycle will not cause short potting, but is
limited to 8-10 ounces of hot water before the cooler
water is passed through coil.
Removal and Replacement:
1. Disconnect the brewer from the power and water
sources.
2. Turn and remove aerator assembly from bottom of
faucet. Clean parts of any mineral buildup. Install
new gasket when reassembling.
3. Remove the bonnet nut and remove handle as-
sembly.
4. Remove the seat cup. Clean inside the faucet body
and install new seat cup.
Fig. 21-1 COIL/FAUCET
BONNET NUT
AERATOR
SEAT CUP
FAUCET BODY
Page 22
SERVICE (cont.)
41711.1 052009
LIMIT THERMOSTAT
Location:
The limit thermostat is located inside the rear of
the hood on the tank lid.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the blue and black wires from the limit
thermostat.
3. Check for continuity across the limit thermostat
terminals with a ohmmeter.
FIG. 22-1 LIMIT THERMOSTAT
FIG. 22-2 LIMIT THERMOSTAT TERMINALS
to Tank
Heater Switch
Lead from
Control Thermostat
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 all wires from limit thermostat termi-
nals.
2. Carefully slide the limit thermostat out from under
the retaining clip and remove limit thermostat.
3. Carefully slide the new limit thermostat into the
retaining clip.
4. Refer to the Fig. 5 when reconnecting the wires.
Page 23
RECOVERY BOOSTER RELAY (OPTIONAL)
FIG. 23-1 RECOVERY BOOSTER RELAY
Location
The recovery booster(s) are located inside the trunk
on the center of the component brackets just above
the solenoid valve. The coil is activated by the timer/
solenoid circuit. The contacts then close, bypassing
the mechanical thermostat, thereby allowing faster
heating of the incoming water in the tank.
Test Procedures
1. Disconnect the brewer from the power source.
2. Disconnect the white and black wires from the coil
of the recovery booster relay.
3. With a voltmeter, check the voltage across the
white and the black wires. Connect the brewer
to the power source and initate a brew cycle. The
indication must be 120 volts ac.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to Wiring
Diagrams and check the brewer wiring harness.
5. Check the resistance across the coil's terminals.
If resistance is present as described in FIG 9, reconnect
the white and black wires to the coil.
If resistance is not present as described, replace the
relay.
6. Disconnect the blue and black wires from the relay
contact terminals. Connect the brewer to the power
source. With the "ON/OFF" switch in the "ON" po-
sition and the start switch pressed and released,
check for continuity across relay terminals.
7. Disconnect the brewer from the power source.
If continuity is present as described, reconnect the blue
and black wires to the relay contact terminals.
If continuity is not present as described replace the
relay.
Removal and Replacement:
1. Remove all wires from the relay.
2. Remove the two #8-32 screws securing the relay
mounting bracket to the component bracket. Re-
move relay bracket and relay as an assembly.
3. Remove the screw securing the relay to the relay
mounting bracket.
4. Install new relay to the component bracket.
5. Refer to Fig. 9 when reconnecting the wires.
EARLY MODELS
1 = COIL to TIMER
LATER MODELS
4-7 = N.O. to THERMOSTAT
6-9 = N.O. spare
A = COIL to TIMER
B = COIL to TIMER
A
4
7
B
6
9
6-8 = N.O. not used
2-4 = N.O. to THERMOSTAT
0 = COIL to TIMER
FIG. 23-2 BOOSTER RELAY TERMINALS
8
6
4
2
1
0
41711.1 052009
Page 24
SERVICE (cont.)
TIMER (Early Models)
Location:
The timer is located inside the front of the trunk
on the upper right side of component bracket.
Test Procedure.
1. Disconnect the brewer from the power source.
2. Disconnect the polarized, three pin connector from
the brewer wiring harness.
3. With a voltmeter, check the voltage across sockets
P2 & P3 (white and white/red wires) of the female
connector when the "ON/OFF" switch is in the "ON"
position (upper). 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 to 240 volts ac on two wire 200 volt or 240
volt models.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the
Wiring Diagrams and check the brewer wiring har-
ness.
5. Check the voltage across the sockets P1 & P2
(blue and white wires) of the female connector
with a voltmeter when the "ON/OFF" switch is in the
"ON" position (upper) and start switch pressed.
FIG. 24-1 TIMER TERMINALS
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 to 240 volts ac for two wire 200 volt or 240
volt models.
6. Disconnect the brewer from the power source.
7. Reconnect the three pin connector from main
wiring harness to the timer.
If voltage is present as described, proceed to #8
If voltage is not present as described, refer to Wiring
Diagrams and check the start switch and brewer wir-
ing harness.
8. With a voltmeter, check the voltage across the
black and white wires when the "ON/OFF" switch
is in the "ON" position (upper) and the "START"
switch is pressed to the "START" position and
released. Connect the brewer to the power source.
The indication must be:
a) 120 volts ac for approximately 20 seconds for
two wire 120 volt models and three wire 120/240
volt models.
b) 200 to 240 volts ac for approximately 20 seconds
for two wire 200 volt or 240 volt models.
If voltage is present as described, the brew timer is
operating properly. Reconnect the polarized, three
pin connector.
If voltage is not present as described, replace the
timer.
Removal and Replacement:
1. Separate all connectors between the brewer wiring
harness and the timer.
2. Remove the one #8-32 screw securing timer to
component bracket.
3 Install new timer circuit board as described in Late
Model Timer section on the following pages.
4. Refer to Fig. 21 when reconnecting the wires.
5. Install the Timer Setting decal provided with the
replacement timer kit, below the schematic on the
inside of the front access panel.
6. Adjust the timer as required. Refer to Late Model
Timer section on the following pages.
EARLY STYLE
To Main Wiring Harness
To Solenoid Valve
41711.1 052009
Page 25
SERVICE (cont.)
FRESHNESS TIMER (Early Models)
Location:
The freshness timer is located inside the front of
the trunk on the component bracket.
Operation:
The freshness timer activates an LED on the
control panel after a predetermined amount of time
(after the brew cycle) to indicate carafe on warmer
too long.
Settings: Default settings underlined
JP1: Choose between flashing LED or steady.
JP2: Choose whether the LED stays ON, then
turns off; or is off, then turns on at the end of delay.
R4: Delay time adjustment, 20-60 minutes.
Test Procedure.
1. Disconnect the brewer from the power source.
2. With a voltmeter, check the voltage across T1 & T2
(black & white wires) of the fresh timer. 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 to 240 volts ac on two wire 200 volt or 240
volt models.
3. Disconnect the brewer from the power source.
FIG. 25-1 TIMER TERMINALS
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 har-
ness.
4. Check the voltage across the T3 and T4 (white/
orange and white/blue wires) of the fresh timer
with a voltmeter when the "ON/OFF" switch is in
the "ON" position (upper) and start switch pressed.
Connect the brewer to the power source. The
indication must be: (when solenoid is activated)
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 240 volts ac for two wire 200 volt or 240
volt models.
5. Disconnect the brewer from the power source.
6. Reconnect the three pin connector from main
wiring harness to the timer.
If voltage is present as described, proceed to #7
If voltage is not present as described, refer to Wiring
Diagrams and check the start switch and brewer wir-
ing harness.
7. With a voltmeter, check the voltage across connec-
tor P1 after the delay period (JP1 set to "STEADY",
and JP2 set to "ON"). The indication must be:
3-5 volts dc (when solenoid is activated).
If voltage is present as described, the fresh timer
is operating properly. If voltage is not present as
described, replace the timer. NOTE: The freshness
timer is no longer available.
Removal and Replacement:
1. Disconnect the brewer from the power source.
2. Disconnect all four connectors from the timer.
2. Remove the two #8-32 screws securing timer to
component bracket.
6. Adjust the timer as required. Refer to Late Model
Timer section on the following pages.
41711.1 052009
Page 26
DIGITAL BREW TIMER (Late Models)
FIG. 26-1 DIGITAL BREW TIMER
SERVICE (cont.)
Location:
The timer is located inside the front of the trunk
on the upper right side of component bracket.
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. With a voltmeter, check the supply 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 and
three wire 120/240 volt models.
b) 200 to 240 volts ac on two wire 200 volt or
240 volt models.
3. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the Wir-
ing Diagrams and check the wiring harness.
4. With a voltmeter, check the output voltage across
terminals TL2 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 and
three wire 120/240 volt models.
b) 200 to 240 volts ac for two wire 200 volt or 240
volt models.
If voltage is present as described, the timer is operat-
ing properly. Reset the timer as required, to obtain the
desired brew volume.
If voltage is not present as described, proceed to
#6.
6. With a voltmeter, check the input start voltage
across terminals TL2 and TL5 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 and
three wire 120/240 volt models.
b) 200 to 240 volts ac on two wire 200 volt or
240 volt models.
If voltage is not present as described, refer to the
Wiring Diagrams and check the wiring harness to the
start switch.
If voltage is present as described, disconnect the brewer
from the power source and replace the timer.
Removal and Replacement:
1. Remove the two #8-32 screws securing circuit
board to the mounting bracket.
2. Remove circuit board and spacers (as required).
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. 21 when reconnecting the
wires.
5. Install new circuit board with spacers (as required)
to the component mounting bracket.
6. Adjust the timer as described in the next sec-
tion.
41711.1 052009
Page 27
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,rstcheckthattheSET/LOCKswitchisinthe
“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 re-
lease 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.
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 im-
mediately 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). Al-
low 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,
rstcheckthattheSET/LOCKswitchisinthe“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 sy-
phon 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/
LOCKswitchtothe“LOCK”position.Thiswillprevent
any further programming until switch is once again
put into the “SET” position.
BLU wire to TL5 from start switch
WHI/GRN wire to TL4 from solenoid
WHI/BLU wire to TL3 from solenoid
WHI wire to TL2 from N/L2
WHI/RED wire to TL1 from on/off switch
FIG. 27-1 DIGITAL TIMER WIRING
SERVICE (cont.)
DIGITAL BREW TIMER (Late Models)(cont.)
41711.1 052009
Page 28
WARMER ELEMENT(S)
Location:
The warmer element(s) is located under the warmer
plate.
Test Procedures:
1. Disconnect the brewer from the power source.
2. With a voltmeter, check voltage across the two
wires at the warmer element with the "ON/OFF"
switch in the "ON" position. Connect the brewer
to the power source. The indication must be 120
volts ac for two wire 120 volt models and three
wire 120/208 and 120/240 volt models, or 230
volts ac for two wire 230 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 Wiring
Diagrams and check wiring harness.
FIG. 28-1 WARMER ELEMENTS
FIG. 28-3 WARMER ELEMENT TERMINALS
SERVICE (cont.)
4. Check the resistance across the two terminals on
the warmer element. NOTE: There should be no
resistance reading between the heater sheath and
either terminal. Refer to the following chart.
If resistance is to specification, reconnect the two
wires to the warmer element.
If resistance is not to specification, replace the warmer
element.
Removal and Replacement:
1. Remove the three #4-40 screws securing the
warmer assembly to the brewer.
2. Lift the warmer assembly from the brewer.
3. Disconnect the two wires from the warmer element
terminals.
4. Remove the two #8-32 nuts securing the warmer
element to the warmer plate.
5. Securely install new warmer element.
6. Reconnect the two wires to warmer element ter-
minals.
7. Securely install warmer assembly on the brewer.
WHI/RED to ON/OFF Switch (Center Warmer)
YEL to ON/OFF Switch (Left Front Warmer)
WHI/VIO to ON/OFF Switch (Left Rear Warmer)
BRN/BLk to ON/OFF Switch (Right Front Warmer)
VIO to ON/OFF Switch (Right Rear Warmer)
WHI to Terminal Block (120V or
120/240V Brewers)
RED to Terminal Block (200V or
240V Brewers
100W-120V 132 - 152
100W-220V 450 - 532
100W-200V 372 - 432
WARMER RESISTANCE
TERMINAL TO SHEATH - INFINITE (OPEN)
41711.1 052009
FIG. 28-2 WARMER ELEMENTS
Page 29
L1
BLK
WHI
BLK
BLK
BLK
BLK
BLK VIO
BRN/BLK
YEL
WHI/VIO
LEFT FRONT
WARMER
LEFT REAR
WARMER
RIGHT FRONT
WARMER
RIGHT REAR
WARMER
BLK BLK
TANK HEATER
WHI (MODEL 20)
NL2
RED (MODEL 35)
GREEN
WHI
WHI
WHI
WHI
WHI
WHI
WHI
WHI
WHI
WHI
WHI/GRN
WHI/BLU
LOWER CENTER WARMER
BLUWHI/RED
WHI/RED
WHI/RED
START SWITCH
SOL
T2
T4
T3T5T1
BREW
TIMER
BLU
LIMIT
THERMOSTAT
ON/OFF SWITCH
"KEEP WARM" HEATER
(FAUCET OPTION
ONLY)
THERMAL
CUT-OFF
HEATER
SWITCH
SWITCH AND
THERMOSTAT
ON/OFF SWITCH
ON/OFF SWITCH
ON/OFF SWITCH
ON/OFF SWITCH
10476.0000G 07/03 © 1990 BUNN-O-MATIC CORPORATION
120/240 VOLTS AC 3 WIRE
120 VOLTS AC 2 WIRE
SINGLE PHASE
SCHEMATIC WIRING DIAGRAM
CRT5, & CRTF5
White Strip-Tac Plus
Black Ink
Finished Size: 4.25" x 5"
53% Reduction
41711.1 052009
Page 30
L1
BLK
BLK
BLK
BLK
BLK
BLK
BRN/BLK
YEL
VIO
WHI/VIO
WHI/RED
WHI/RED
WHI/RED
WHI/BLU
RED
RED
RED
RED
RED
RED
RED
WHI/GRN
BREW
TIMER
T1 T5 T3
T4
T2
BLU
START SWITCH
WHI
BLK BLK
GRN/YEL
RED
L2
WHI
RED
RED
SOL
TANK HEATER
(MODEL CRTF5A ONLY)
THERMAL
CUT-OFF
BLU
HEATER
SWITCH
LIMIT
THERMOSTAT
"KEEP WARM" HEATER
LOWER CENTER WARMER
LEFT FRONT
WARMER
LEFT REAR
WARMER
RIGHT FRONT
WARMER
RIGHT REAR
WARMER
ON/OFF SWITCH
ON/OFF SWITCH
ON/OFF SWITCH
ON/OFF SWITCH
ON/OFF SWITCH
SWITCH AND
THERMOSTAT
10477.0000H 07/03 © 1990 BUNN-O-MATIC CORPORATION
240 VOLTS AC 2 WIRE
SINGLE PHASE
SCHEMATIC WIRING DIAGRAM
CRT5A, & CRTF5A
41711.1 052009
Page 31
L1
BLK
BLK WHI/RED
WHI/RED
WHI/RED
BLK
YEL
WHI/VIO
BRN/BLK
VIO
BLK
BLK
BLK
LOWER CENTER WARMER
ON/OFF SWITCH
ON/OFF SWITCH
ON/OFF SWITCH
ON/OFF SWITCH
ON/OFF SWITCH
BLK BLK
GREEN
TANK HEATER
WHI
L2
WHI
WHI
WHI
WHI
WHI
WHI
WHI
WHI
WHI
SOL
BLU
START SWITCH
T1 T5 T3
T4
T2
WHI/BLU
BREW
TIMER
LEFT FRONT
WARMER
LEFT REAR
WARMER
RIGHT FRONT
WARMER
RIGHT REAR
WARMER
WHI/GRN
(MODEL CRTF5B ONLY)
THERMAL
CUT-OFF
BLU
HEATER
SWITCH
LIMIT
THERMOSTAT
SWITCH AND
THERMOSTAT
10477.0001H 07/03 © 1993 BUNN-O-MATIC CORPORATION
200 VOLTS AC 2 WIRE
SINGLE PHASE
SCHEMATIC WIRING DIAGRAM
CRT5B, & CRTF5B
41711.1 052009
Page 32
10693.0000G 02/07 © 1993 BUNN-O-MATIC CORPORATION
120/240 VOLTS AC 3 WIRE
120 VOLTS AC 2 WIRE
SINGLE PHASE
BREW
TIMER
WHI
WHI
WHI
WHI/BLU
WHI/GRN
SOL
T1
T2
T3
T4
T5
START SWITCH
BLU
WHI/RED
BLK
BLK BLK BLK
WHI/RED
ON/OFF
SWITCH
OPTIONAL AUTOMATIC BREW CIRCUIT
WHI
HEATER
SWITCH
"KEEP WARM" HEATER
TANK HEATER
BLKBLK
BLKBLU
(FAUCET OPTION ONLY)
THERMAL
FUSE
READY INDICATOR
SW. & THERMOSTAT
LIMIT
THERMOSTAT
SCHEMATIC WIRING DIAGRAM
CW/CWT/CWTF - APS/TS/TSR/TC
WHI-14 Model 20
RED-14 Model 35
BLK-14
GREEN
BLK Model 20 & 35
L1
L2
BLK
BLK Model 15
N
MAIN ON/OFF SWITCH
(Late 20 & 35
Models only)
WHI Model 15
RED Model 35
WHI Model 15 & 35
WHI Model 20
WHI Model 20
41711.1 052009
Page 33
AUXILIARY OUTLET
(200 WATT MAXIMUM)
BLK
E.R.T
ASSY.
120/240 VOLTS AC 3 WIRE
120 VOLTS AC 2 WIRE
SINGLE PHASE
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
WHIBLK
SOL
BLU BLU
WHI
BREW
TIMER
BLK
P1
P3
P2
WHI
OPTIONAL AUTOMATIC BREW CIRCUIT
SCHEMATIC WIRING DIAGRAM CW-TS & CW-APS ERT
10693.0001C 9/96 © 1996 BUNN-O-MATIC CORPORATION
WHI
BLK
ON/OFF
SWITCH
START SWITCH
WHI/RED
WHI/RED
BLU
LIMIT
THERMOSTAT
BLK
HEATER
SWITCH
WHI
(FAUCET OPTION ONLY)
THERMAL FUSE
WHI
BLK
L1
TANK HEATER
GRN
N
RED (3-WIRE MODELS)
L2
WHI (2-WIRE MODELS)
BLK
TAN
TAN
THERMOSTAT
SWITCH
BLU
"KEEP WARM" HEATER
50W
READY INDICATOR
WHI
BLU BLK
WHI
41711.1 052009
Page 34
SCHEMATIC WIRING DIAGRAM FOR CWT-APS MV,
CWTF-APS MV, CWTF-TS MV, CWTF-TSR MV
41711.1 052009
Page 35
41711.1 052009
Page 36
41711.1 052009
Page 37
41711.1 052009
Page 38
BLK
41711.1 052009
Page 39
41711.1 052009
Page 40
WHI/RED
LEFT LOWER WARMER
WHI/RED
WHI/GRN
P1-2
P1-3
P4-2
P4-3
SCHEMATIC WIRING DIAGRAM
CWT/CWTF TWIN 0/2, 2/2, 4/2 & CWT TWIN-APS
(FAUCET)
THERMAL
SAFETY FUSE
BLK
RIGHT TANK HEATER
BLK
BLK BLK
REDBLUBLKBLK
SW2
RT. LIMIT
THERMOSTAT
RT. READY INDICATOR
RT. SW. & THERMOSTAT
BLK
10736.0000L 03/07 © 1993 BUNN-O-MATIC CORPORATION
120/240 VOLTS AC
3 WIRE + GND
SINGLE PHASE
RED
WHI
WHI
WHI
MODEL 4/2 ONLY
RED
SW9
LEFT TOP REAR WARMER
P5-2
P5-3
SW10
BLK
RIGHT TOP REAR WARMER
WHI
P5-1
WHI/VIO WHI/VIO
WHI/BRN WHI/BRN
WHI WHI
RED
WHI
WHI
WHI
LEFT TOP FRONT
WARMER
RIGHT TOP FRONT WARMER
WHI
P4-1
YEL YEL
WHI/YEL WHI/YEL
WHI WHIRED
SW7
SW8
BLK
WHI/BLU
LT
SOL
BLU
LEFT
BREW TIMER
SW5
WHI/RED
WHI/RED
RED
WHI
WHI
WHI
WHI
P1-1
WHI/GRN
WHI
WHIRED
SW3
SW4
BLK
RIGHT "KEEP WARM" HEATER
WHI
WHI/BLU
RT
SOL
BLU
WHI/GRN
RIGHT
BREW TIMER
WHI
SW6
BLK
WHI/GRN
WHI/GRN
WHI
LEFT TANK HEATER
REDBLUBLKBLK
SW1
LT.LIMIT
THERMOSTAT
LT. READY INDICATOR
LT. SW. & THERMOSTAT
BLK
LEFT "KEEP WARM" HEATER
WHI WHI
RIGHT LOWER WARMER
MODELS 2/2 & 4/2 ONLY
(NOT AVAILABLE ON CWT TWIN-APS)
WHI
RED
RED
BLU
BLU
T1 T5 T3
T1 T5 T3
T4
T2
T4
T2
GRN
N
L1
L2
WHI
BLK
RED
BLK
MAIN ON/OFF SWITCH
(Late Models only)
41711.1 052009
Page 41
WHI/RED
LEFT LOWER WARMER
WHI/RED
WHI/GRN
P1-2
P1-3
P4-2
P4-3
SCHEMATIC WIRING DIAGRAM
CWT/CWTF TWIN 0/2, 2/2, 4/2 & CWT TWIN-APS
(FAUCET)
THERMAL
SAFETY FUSE
BLK
RIGHT TANK HEATER
BLK
BLK BLK
REDBLUBLKBLK
SW2
RT. LIMIT
THERMOSTAT
RT. READY INDICATOR
RT. SW. & THERMOSTAT
BLK
10736.0000M 01/10 © 1993 BUNN-O-MATIC CORPORATION
120/240 VOLTS AC
3 WIRE + GND
SINGLE PHASE
RED
WHI
WHI
WHI
MODEL 4/2 ONLY
RED
SW9
LEFT TOP REAR WARMER
P5-2
P5-3
SW10
BLK
RIGHT TOP REAR WARMER
WHI
P5-1
WHI/VIO WHI/VIO
WHI/BRN WHI/BRN
WHI WHI
RED
WHI
WHI
WHI
LEFT TOP FRONT
WARMER
RIGHT TOP FRONT WARMER
WHI
P4-1
YEL YEL
WHI/YEL WHI/YEL
WHI WHIRED
SW7
SW8
BLK
WHI/BLU
LT
SOL
BLU
LEFT
BREW TIMER
SW5
WHI/RED
WHI/RED
WHI
WHI
WHI
WHI
P1-1
WHI/GRN
WHI
WHIBLK
SW3
SW4
BLK
RIGHT "KEEP WARM" HEATER
WHI
WHI/BLU
RT
SOL
BLU
WHI/GRN
RIGHT
BREW TIMER
WHI
SW6
BLK
WHI/GRN
WHI/GRN
WHI
LEFT TANK HEATER
REDBLUBLKBLK
SW1
LT.LIMIT
THERMOSTAT
LT. READY INDICATOR
LT. SW. & THERMOSTAT
BLK
LEFT "KEEP WARM" HEATER
WHI WHI
RIGHT LOWER WARMER
MODELS 2/2 & 4/2 ONLY
(NOT AVAILABLE ON CWT TWIN-APS)
WHI
RED
RED
BLU
BLU
T1 T5 T3
T1 T5 T3
T4
T2
T4
T2
GRN
N
L1
L2
WHI
BLK
RED
BLK
MAIN ON/OFF SWITCH
(Late Models only)
Models after 2/210
41711.1 020410
Page 42
WHI/RED
WHI/GRN
P1-2
P1-3
P4-2
P4-3
SCHEMATIC WIRING DIAGRAM CWTFA
TWIN 2/2 & 4/2
L1
GRN/YEL
L2 L3
RIGHT TANK HEATER
BLK BLU
RT. READY INDICATOR
RT. SW. & THERMOSTAT
REDBLK
SW2
BLU
RT. LIMIT
THERMOSTAT
BLU
10736.0001G 12/00 © 1993 BUNN-O-MATIC CORPORATION
230 VOLTS AC 3 WIRE
THREE PHASE
RED
RED
RED
MODEL 4/2 ONLY
SW9
LEFT TOP REAR WARMER
P5-2
P5-3
SW10
BLK
RIGHT TOP REAR WARMER
RED
P5-1
WHI/VIO WHI/VIO
WHI/BRN WHI/BRN
RED RED
RED
RED
RED
LEFT TOP FRONT
WARMER
RIGHT TOP FRONT WARMER
RED
P4-1
YEL YEL
WHI/YEL WHI/YEL
RED REDBLK
SW7
SW8
BLK
P2-3
BLK
WHI/GRN
WHI/BLU
BLU BLU/BLK
LEFT
BREW TIMER
P2-1
SW5
WHI/RED
WHI/RED
RED
RED
RED
LEFT LOWER WARMER
RIGHT LOWER WARMER
RED
P1-1
WHI/RED
WHI/GRN
RED RED
SW3
SW4
BLK
RIGHT "KEEP WARM" HEATER
WHI WHI
P3-3
BLK
WHI/GRN
WHI/BLU
RT
SOL
BLU BLU/BLK
WHI
RIGHT
BREW TIMER
P3-1
P3-2
RED
SW6
WHI/GRN
WHI/GRN
WHI
P2-2
RED
LEFT "KEEP WARM" HEATER
WHI WHI
BLK
LT
SOL
BLK
BLU
LT. READY INDICATOR
LT. SW. & THERMOSTAT
BLK
(FAUCET)
THERMAL
SAFETY FUSE
BLK
LEFT TANK HEATER
BLU
SW1
BLU
LT. LIMIT
THERMOSTAT
RED
BLK
BLK
RED
BLK
BLU
BLU
BLK
RED
T1 T5 T3
T1 T5 T3
T4
T2
T4
T2
41711.1 052009
Page 43
BLK WHI/RED
WHI/GRN
P1-2
P1-3
P4-2
P4-3
SCHEMATIC WIRING DIAGRAM
CWTFA & CWTFB TWIN 2/2 & 4/2
L1
GRN/YEL
L2
(FAUCET)
THERMAL
FUSE
BLK
RIGHT TANK HEATER
BLK REDBLUBLKBLK
SW2
RT. LIMIT
THERMOSTAT
RT. READY INDICATOR
RT. SW. & THERMOSTAT
BLKRED
10736.0002J 12/00 © 1993 BUNN-O-MATIC CORPORATION
200 OR 240 VOLTS AC 2 WIRE
SINGLE PHASE
RED
RED
RED
MODEL 4/2 ONLY
BLK
SW9
LEFT TOP REAR WARMER
P5-2
P5-3
SW10
BLK
RIGHT TOP REAR WARMER
RED
P5-1
WHI/VIO WHI/VIO
WHI/BRN WHI/BRN
RED RED
RED
RED
RED
LEFT TOP FRONT WARMER
RIGHT TOP FRONT WARMER
RED
P4-1
YEL YEL
WHI/YEL WHI/YEL
RED REDBLK
SW7
SW8
BLK
P2-3
BLK
WHI/GRN
WHI/BLU
LT
SOL
BLU BLU/BLK
LEFT
BREW TIMER
P2-1
SW5
WHI/RED
WHI/RED
RED
RED
RED
LEFT LOWER WARMER
RIGHT LOWER WARMER
RED
P1-1
WHI/RED
WHI/GRN
RED RED
SW3
SW4
BLK
P3-3
BLK
WHI/GRN
WHI/BLU
RT
SOL
BLU BLU/BLK
WHI
RIGHT
BREW TIMER
P3-1
P3-2
RED
SW6
WHI/GRN
WHI/GRN
WHI
P2-2
RED
LEFT TANK HEATER
REDBLUBLKBLK
SW1
LT.LIMIT
THERMOSTAT
LT. READY INDICATOR
LT. SW. & THERMOSTAT
BLKRED
BLU
BLU
BLKBLK
T1 T5 T3
T4
T2
T1 T5 T3
T4
T2
41711.1 052009
Page 44
BLK WHI/RED
WHI/GRN
P1-2
P1-3
P4-2
P4-3
SCHEMATIC WIRING DIAGRAM
CWTFA 2/2 TWIN, CWTFA 4/2 TWIN & CWTFA TWIN-APS
L1 L2
10736.0004A 02/06 © 2006 BUNN-O-MATIC CORPORATION
230 VOLTS AC 2 WIRE
SINGLE PHASE
RED
RED
RED
MODEL 4/2 ONLY
NOT APPLICABLE TO APS MODELS
NOT APPLICABLE TO APS MODELS
BLK
SW9
LEFT TOP REAR WARMER
P5-2
P5-3
SW10
BLK
RIGHT TOP REAR WARMER
RED
P5-1
WHI/VIO WHI/VIO
WHI/BRN WHI/BRN
RED RED
RED
RED
RED
LEFT TOP FRONT WARMER
RIGHT TOP FRONT WARMER
RED
P4-1
YEL YEL
WHI/YEL WHI/YEL
RED REDBLK
SW7
SW8
BLK
P2-3
BLK
WHI/GRN
WHI/BLU
LT
SOL
BLU BLU/BLK
LEFT
BREW TIMER
P2-1
SW5
WHI/RED
WHI/RED
RED
RED
RED
LEFT LOWER WARMER
RIGHT LOWER WARMER
RED
P1-1
WHI/RED
WHI/GRN
RED RED
SW3
SW4
BLK
P3-3
BLK
WHI/GRN
WHI/BLU
RT
SOL
BLU BLU/BLK
WHI
RIGHT
BREW TIMER
P3-1
P3-2
RED
SW6
WHI/GRN
WHI/GRN
WHI
P2-2
RED
T1 T5 T3
T4
T2
T1 T5 T3
T4
T2
GRN/YEL
RIGHT TANK HEATER
BLK
RT. READY INDICATOR
RT. SW. & THERMOSTAT
BLK
SW2
BLKBLU
WHI WHI
LEFT "KEEP WARM" HEATER
RIGHT "KEEP WARM" HEATER
WHI WHI
BLK BLK
BLU
RED
BLK
BLK
BLK
BLU
BLK
RED
RED
LEFT TANK HEATER
RT. LIMIT
THERMOSTAT
LT. READY INDICATOR
LT. SW. & THERMOSTAT
BLKBLK
BLK
BLU
SW1
LT. LIMIT
THERMOSTAT
(FAUCET)
THERMAL
SAFETY FUSE
BLK
41711.1 052009
Page 45
SCHEMATIC WIRING DIAGRAM
CWTFA TWIN-APS CE
L1
GRN/YEL
L2
BLK
10736.0005B 08/07 © 2007 BUNN-O-MATIC CORPORATION
230 VOLTS AC
2 WIRE + GND
SINGLE PHASE
RED
SW4
BLK
WHI/GRN
WHI/BLU
RT
SOL
BLU
RIGHT
BREW TIMER
RED
SW6
WHI/RED
WHI/REDWHI/RED
LT. TANK HEATER
REDBLUBLK
SW1
NCNC
NCNC
LT. READY INDICATOR
LT. SW. & THERMOSTAT
BLKRED
BLK
T1 T5 T3
T4
T2
LT. LIMIT
THERMOSTAT
RED
SW3
BLK
WHI/GRN
WHI/BLU
LT
SOL
BLU
LEFT
BREW TIMER
RED
SW5
WHI/RED
WHI/REDWHI/RED
T1 T5 T3
T4
T2
LEFT "KEEP WARM" HEATER
WHI WHIBLK
BLK
RT. TANK HEATER
RED
RED
REDBLUBLK
SW2
LT. SW. & THERMOSTAT
RT. LIMIT
THERMOSTAT
RIGHT "KEEP WARM" HEATER
WHI WHIBLK
BLU
LT. READY INDICATOR
BLKRED
BLK
BLU
41711.1 052009
Page 46
GRY
PIN
L.E.D.L.E.D.
GRYPIN
GRY
PIN
OPTIONAL
INDICATOR
TIMER
WHI/RED
WHI/GRN
P1-2
P1-3
SCHEMATIC WIRING DIAGRAM CWTF TWIN 0/6
(FAUCET)
BLKBLK
RIGHT TANK HEATER
BLKBLUBLKBLK
SW2
RT. LIMIT
THERMOSTAT
RT. READY INDICATOR
RT. SW. & THERMOSTAT
BLKRED
LEFT BREW WARMER
RIGHT BREW WARMER
WHI
P1-1
WHI/RED
WHI/GRN
WHI WHI
RED
SW3
SW4
BLK
RIGHT "KEEP WARM" HEATER
WHI
WHI/GRN
WHI
P3-2
WHI/GRN
WHI/GRN
LEFT TANK HEATER
RED
RED
REDBLUBLKBLK
SW1
LT.LIMIT
THERMOSTAT
LEFT "KEEP WARM" HEATER
WHI
WHI/RED
WHI/RED
WHI/RED
P2-3
BLK
WHI/GRN
WHI/BLU
SW6
SW5
BLU BLU/BLK
LEFT
BREW TIMER
P2-1
WHI
P2-2
P4-2
P4-3
10741.0000H 01/07 © 1993 BUNN-O-MATIC CORPORATION
120/240 VOLTS AC
3 WIRE + GND
SINGLE PHASE
WHI
WHI
WHI
WHI
WHI
WHI
WHI
LEFT FRONT WARMER
LEFT REAR WARMER
SW9
RIGHT FRONT WARMER
P5-2
P5-3
SW10
BLK
RIGHT REAR WARMER
WHI
BRN/BLK
VIO
WHI
BLK
P3-1
P3-3
BLK
WHI/BLU
BLU BLU/BLK
SW7
SW8
RED
RED
SW11
YEL
WHI/VIOWHI
SW12
WHI
WHI
P5-1
BRN/BLK
VIO
WHI
WHI
WHI
YEL
WHI/VIO
WHI
P4-1
WHI/ORA
WHI/ORA
WHI
WHI/ORA
BLK
WHI
WHI/ORA
BLK
WHI
WHI
LT. READY INDICATOR
BLK
BLU
LT. SW. & THERMOSTAT
THERMAL
SAFETY FUSE
LT
SOL
RT
SOL
RIGHT
BREW TIMER
4321
T1 T5 T3
T4
T2
T1 T5 T3
T4
T2
GRN
N
L1
L2
WHI
BLK
RED
BLK
MAIN ON/OFF SWITCH
(Late Models only)
41711.1 052009
Page 47
WHI/BLU
P3
BLK
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
BLU
BLU/BLK
WHI
BREW
TIMER
P1
P2
WHI
OPTIONAL AUTOMATIC BREW CIRCUIT
SCHEMATIC WIRING DIAGRAM C, CT & CWT
10836.0000H 05/09 ©1995 BUNN-O-MATIC CORPORATION
P2
P1
FRONT
WHI
WHI
P3
WHI
BRN/BLK
VIO
WHI
REAR
WHI
WHIBLK
WHI/RED
LOWER WARMER
START SWITCH
WHI/RED
WHI/RED
ON/OFF
SWITCH
WHI/RED
REAR
WHI
WHI
P3
P1
VIO
120/240 VOLTS AC 3 WIRE
120 VOLTS AC 2 WIRE
SINGLE PHASE
BLK
BRN/BLK
BLK
VIO
OPTIONAL DUAL WARMER ASSY (TOP OR SIDE)
BLK
OPTIONAL SINGLE TOP WARMER ASSY
IHWOIV
OPTIONAL FRESH LIGHT SYSTEM (EARLY MODELS)
WHI
WHI/ORA
GRY
L.E.D.
PNK
INDICATOR
TIMER
4
3
2
1
SOL
T1 T5 T3
T4
T2
WHI/BLU
WHI/GRN
1
3
2
1
3
2
1
3
2
1
3
2
WHI
BLK BLK BLU
WHI
HEATER
SWITCH
"KEEP WARM" HEATER
TANK HEATER
BLKBLK
BLKBLU
(FAUCET OPTION ONLY)
THERMAL
FUSE
READY INDICATOR
SW. & THERMOSTAT
LIMIT
THERMOSTAT
WHI-14 Model 20
RED-14 Model 35
BLK-14
GREEN
BLK Model 20 & 35
L1
L2
BLK
BLK Model 15
N
MAIN ON/OFF SWITCH
(Late 20 & 35
Models only)
WHI Model 15
RED Model 35
WHI Model 15 & 35
WHI Model 20
WHI Model 20
L1 N
41711.1 052009
Page 48
P3
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
BLU
P1
RED
OPTIONAL AUTOMATIC BREW CIRCUIT
SCHEMATIC WIRING DIAGRAM CWTB
10836.0002E 07/00 ©1995 BUNN-O-MATIC CORPORATION
P2
P1
FRONT
RED
RED
P3
RED
BRN/BLK
VIO
RED
REAR
RED
RED
REDBLK
WHI/RED
LOWER WARMER
START SWITCH
WHI/RED
WHI/RED
L1
GRN/YEL
BLK
L2
HEATER
SWITCH
BLK
BLU
ON/OFF SWITCH
WHI/RED
REAR
RED
RED
P3
P1
VIO
(FAUCET
OPTION ONLY)
THERMAL
FUSE
BLKBLK
LIMIT
THERMOSTAT
200 VOLTS AC 2 WIRE
SINGLE PHASE
BLK
BRN/BLK
BLK
VIO
OPTIONAL DUAL WARMER ASSY (TOP OR SIDE)
BLK
OPTIONAL SINGLE TOP WARMER ASSY
VIO RED
READY
BLK
BLU
SW. & THERMOSTAT
TANK HEATER
BLK
BLU/BLK
WHI
BREW
TIMER
P2
SOL
T1 T5 T3
T4
T2
WHI/BLU
WHI/GRN
1
3
2
1
3
2
1
3
2
1
3
2
41711.1 052009
Page 49
P3
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
BLU
P1
RED
OPTIONAL AUTOMATIC BREW CIRCUIT
SCHEMATIC WIRING DIAGRAM CWTA
10836.0003E 07/00 ©1995 BUNN-O-MATIC CORPORATION
P2
P1
FRONT
RED
RED
P3
RED
BRN/BLK
VIO
RED
REAR
RED
WHI
RED
REDBLK
WHI/RED
LOWER WARMER
START SWITCH
WHI/RED
WHI/RED
L1
GRN/YEL
BLK
L2
HEATER
SWITCH
BLK
BLU
ON/OFF
SWITCH
WHI/RED
WHI
REAR
RED
RED
P3
P1
VIO
(FAUCET
OPTION ONLY)
THERMAL
FUSE
BLKBLK
LIMIT
THERMOSTAT
220-240 VOLTS AC
2 WIRE
SINGLE PHASE
BLK
BRN/BLK
BLK
VIO
OPTIONAL DUAL WARMER ASSY (TOP OR SIDE)
BLK
OPTIONAL SINGLE TOP WARMER ASSY
VIO RED
READY
BLK
BLU
SW. & THERMOSTAT
TANK HEATER
"KEEP WARM"
BLK
BLU/BLK
WHI
BREW
TIMER
P2
SOL
T1 T5 T3
T4
T2
WHI/BLU
WHI/GRN
1
3
2
1
3
2
1
3
2
1
3
2
41711.1 052009
Page 50
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
SOL
BREW
TIMER
RED
RED
10836.0004H 10/02 ©1997 BUNN-O-MATIC CORPORATION
P2
P1
FRONT WARMER
RED
RED
P3
RED
BRN/BLK
VIO
RED
REAR WARMER
RED
RED
WHI/RED
WHI/RED
LOWER WARMER
REAR WARMER
RED
RED
P3 P1
VIO
230 VOLTS AC
2 WIRE
SINGLE PHASE
BLK BRN/BLK
BLK VIO
OPTIONAL DUAL WARMER ASSY (TOP OR SIDE)
BLK
OPTIONAL SINGLE TOP WARMER ASSY
VIO RED
BLK
BLK
ON/OFF
SWITCH
WHI/RED
TANK HEATER
SCHEMATIC WIRING DIAGRAM CWTA - CE
L2
L1
GRN/YEL
BLK
HEATER
SWITCH
BLK
BLU
THERMAL
FUSE
THERMAL
FUSE
BLKBLK
LIMIT
THERMOSTAT
RED
RED
"KEEP WARM" HEATER
WHI
WHI
WHI/ORN
WHI/GRN
WHI/YEL
START
SWITCH
1
2
3
4
5
READY INDICATOR
BLK
BLU
SW. & THERMOSTAT
GRY
PNK
GRINDER
INTERFACE
CONNECTOR
4
1
2
3
BATCH
SELECTION
SWITCH
OPTIONAL GRINDER INTERFACE
41711.1 052009
Page 51
20
AMP
T1
T5 T3 T4
T2
41711.1 052009
Page 52
P3
BLK
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
WHI
BLK
SOL
BLU BLU
WHI
BREW
TIMER
P1
P2
WHI
OPTIONAL AUTOMATIC BREW CIRCUIT
SCHEMATIC WIRING DIAGRAM
CWTF, CWTFB NO WARMER
10836.0006M 02/07 ©1995 BUNN-O-MATIC CORPORATION
WHI
BLK
START SWITCH
WHI/RED
WHI/RED
TANK HEATER
BLK
HEATER
SWITCH
BLK
BLU
READY INDICATOR
BLU
SW. & THERMOSTAT
ON/OFF
SWITCH
WHI/RED
"KEEP WARM" HEATER
WHI
(FAUCET OPTION ONLY)
THERMAL
FUSE
BLKBLK
LIMIT
THERMOSTAT
120/240 VOLTS AC 3 WIRE
100-120 VOLTS AC 2 WIRE
SINGLE PHASE
BLK
WHI
OPTIONAL FRESH LIGHT SYSTEM
BLK
4
3
2
1
PNK
GRY
L.E.D.
INDICATOR
TIMER
WHI
WHI/ORA
WHI-14 Model 20
RED-14 Model 35
BLK-14
GREEN
BLK Model 20 & 35
L1
L2
BLK
BLK Model 15
N
MAIN ON/OFF SWITCH
(Late 20 & 35
Models only)
WHI Model 15
RED Model 35
WHI Model 15 & 35
WHI Model 20
WHI Model 20
41711.1 052009
Page 53
READY INDICATOR
BLK
BLU
SW. & THERMOSTAT
P3
BLK
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
WHI
BLK
SOL
BLU BLU
WHI
BREW
TIMER
P1
P2
WHI
OPTIONAL AUTOMATIC BREW CIRCUIT
SCHEMATIC WIRING DIAGRAM
CWTFA NO WARMER
10836.0008A 12/99 ©1999 BUNN-O-MATIC CORPORATION
RED
BLK
WHI/RED
WHI/RED
TANK HEATER
L1
GRN
BLK
RED
L2
HEATER
SWITCH
BLK
BLK
BLU
ON/OFF
SWITCH
WHI/RED
"KEEP WARM" HEATER
WHI
THERMAL
FUSE
THERMAL
FUSE
BLKBLK
LIMIT
THERMOSTAT
230 VOLTS AC
2 WIRE
SINGLE PHASE
WHI
OPTIONAL FRESH LIGHT SYSTEM
BLK
4
3
2
1
PNK
GRY
L.E.D.
INDICATOR
TIMER
WHI
WHI/ORA
START SWITCH
RED
RED
41711.1 052009
Page 54
T1
T5 T3 T4
T2
BLK-14 BLK-14
120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE
SINGLE PHASE
WHI-14
WHI
WHI
WHIWHI/RED
WHI/RED
WHI/RED
WHI
WHI
WHIWHI
WHI
WHI
WHIWHI
WHI/GRN
WHI/BLU
WHI/VIO-14
BLU-14
RED-14
TANK HEATER
1320 W
1800 W
TANK HEATER
SELECTOR
SWITCH
10836.0009C 02/07 ©2003 BUNN-O-MATIC CORPORATION
BLK
BLK
BLK
BRN/BLK BRN/BLK
BLK
BLK BLK
BLK
BLU
BLU
WHI/RED
WHI
HEATER
SWITCH
ON/OFF
SWITCH
BLU
LIMIT
THERMOSTAT
READY INDICATOR
SW. & THERMOSTAT
VIO
VIO
VIO
VIO
REAR WARMER
FRONT WARMER
LOWER WARMER
REAR WARMER
BREW
TIMER
SOL
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE PIN
CONNECTOR
P2
P1
P1
P3
P3
OPTIONAL AUTOMATIC BREW CIRCUIT
START SWITCH
"KEEP WARM" HEATER
OPTIONAL DUAL WARMER ASSY (TOP OR SIDE)
OPTIONAL SINGLE TOP WARMER ASSY
SCHEMATIC WIRING DIAGRAM
CT-DV, CTF-DV, CWT-DV & CWTF-DV
(FAUCET OPTION ONLY)
THERMAL
SAFETY FUSE
GRN
BLK
N
L1
L2
WHI
BLK
RED
MAIN ON/OFF SWITCH
(Late Models only)
41711.1 052009
Page 55
T1
T5 T3 T4
T2
BLK-14 BLK-14
120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE
SINGLE PHASE
WHI-14
WHI
WHI
WHI/RED
WHI/RED
WHI
WHI/GRN
WHI/BLU
WHI/VIO-14
BLU-14
RED-14
TANK HEATER
TANK HEATER
SELECTOR
SWITCH
10836.0010B 02/07 ©2001 BUNN-O-MATIC CORPORATION
BLK
BLK BLK
BLK
BLU
BLU
WHI/RED
WHI
HEATER
SWITCH
ON/OFF
SWITCH
BLU
LIMIT
THERMOSTAT
READY INDICATOR
SW. & THERMOSTAT
BREW
TIMER
SOL
START SWITCH
"KEEP WARM" HEATER
SCHEMATIC WIRING DIAGRAM
CWT, CWTF - APS, TS, TC DV
THERMAL
SAFETY FUSE
(Faucet models only)
GRN
BLK
N
L1
L2
WHI
BLK
RED
MAIN ON/OFF SWITCH
(Late Models only)
41711.1 052009
Page 56
BLU
WHI
BREW
TIMER
SCHEMATIC WIRING DIAGRAM
SINGLE CW
10836.0011B 01/03 ©2003 BUNN-O-MATIC CORPORATION
WHI
WHI
WHI
WHIBLK
WHI/RED
LOWER WARMER
START SWITCH
WHI/RED
WHI/RED
L1
GRN
BLK
RED (MODEL 35)
WHI (MODELS 15 & 20)
N L2
HEATER
SWITCH
BLK
BLU
ON/OFF
SWITCH
WHI/RED
WHI
WHI
(FAUCET
OPTION ONLY)
THERMAL
FUSE
BLKBLK
LIMIT
THERMOSTAT
120/240 VOLTS AC 3 WIRE
120 VOLTS AC 2 WIRE
SINGLE PHASE
BLK
BRN/BLK
VIO
TAN
PNK
BLK
WHI
READY
BLK
BLK
SW. & THERMOSTAT
TANK HEATER
"KEEP WARM" HEATER
SOL
T1 T5 T3
T4
T2
WHI/BLU
WHI/GRN
1
3
2
P1
P3
P2
1
3
2
1
3
2
HALF/FULL
SWITCH
NO CONNECTION THIS APPLICATION
P1, P2, &
P3 ARE
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR.
41711.1 052009
Page 57
BLK
WHI
RED
BLU
TANK HEATER
BLK
LIMIT
THERMOSTAT
LIMIT
THERMOSTAT
SW1-L
SW1-R
(FAUCET SIDE)
"KEEP WARM" HEATER
SCHEMATIC WIRING DIAGRAM
CWTF TWIN 4/2 & 0/6 TWO-CIRCUIT
LEFT
RIGHT
10847.0000D 01/07 ©1994 BUNN-O-MATIC CORPORATION
TWO INDIVIDUAL BRANCH
CIRCUITS REQUIRED
EACH RATED
120/240 VOLTS AC
3 WIRE + GND
SINGLE PHASE
"KEEP WARM" HEATER
BLU
TANK HEATER
BLK BLK
BLK
WHI
WHI
RED
LEFT BREW WARMER
WHI/GRN
BLU BLU/BLK
WHI
BLKWHI/RED
SW3-L
SW2-L
BLK
WHI
P1-1L
P1-2L
P1-3L
WHI/RED
WHI/BLU
WHI/RED
WHI/GRN
BLU BLU/BLK
WHI
BLKWHI/RED
SW3-R
SW2-R
BLK
WHI
P1-1R
P1-2R
P1-3R
WHI/RED
WHI/BLU
RIGHT BREW WARMER
WHI
WHI
WHI/RED
WHI
BLK
LEFT FRONT WARMER
VIO
LEFT REAR WARMER
SW4-L
P2-2L
BRN/BLK
SW5-L
P2-3L
WHI
VIOBLK
P2-1L
WHI
WHI
RIGHT FRONT WARMER
BRN/BLK
VIO
RIGHT REAR WARMER
SW4-R
BLK
P2-2R
BRN/BLK
P2-1R
SW5-R
P2-3R
WHI
VIO
BLK
WHI
BLK
WHI
WHI
WHI
WHI
WHI
THERMAL
SAFETY FUSE
BLK
BLK
READY INDICATOR
BLK
RED
SW. & THERMOSTAT
READY INDICATOR
BLK
RED
SW. & THERMOSTAT
SOL
BREW TIMER
BREW TIMER
SOL
T1 T5 T3
T1 T5 T3
T4
T2
T4
T2
GRN
N
L1
L2
WHI
BLK
BLK
RED
MAIN ON/OFF SWITCH
(Late Models only)
GRN
N
L1
L2
WHI
BLK
BLK
RED
MAIN ON/OFF SWITCH
(Late Models only)
41711.1 052009
Page 58
P4-2
P4-3
SCHEMATIC WIRING DIAGRAM CWT TWIN 2/2 & 4/2
W/RECOVERY BOOSTER
RED
WHI
WHI
WHI
LEFT TOP WARMER
RIGHT TOP WARMER
WHI
P4-1
YEL YEL
WHI/YEL WHI/YEL
WHI WHIRED
SW7
SW8
BLK
P5-3
P5-2
10867.0000F 01/07 © 1995 BUNN-O-MATIC CORPORATION
120/240 VOLTS AC
3 WIRE + GND
SINGLE PHASE
RED
WHI
WHI
WHI
LEFT TOP WARMER
RIGHT TOP WARMER
WHI
P5-1
WHI/VIO WHI/VIO
WHI/BRN WHI/BRN
WHI WHIRED
SW9
SW10
BLK
LEFT TANK HEATER
REDBLUBLKBLK
SW1
LT. LIMIT
THERMOSTAT
BLK
BLK
RT
SOL
WHIBLK
K2
WHIBLK
P2-3
BLK
LT
SOL
BLU BLU/BLK
LEFT
BREW TIMER
P2-1
SW5
WHI/RED
WHI/RED
RED
WHI
WHI
WHI
SW3
WHI/RED
WHI/GRN
P1-2
P1-3
LEFT LOWER WARMER
RIGHT LOWER WARMER
WHI
P1-1
WHI/RED
WHI/GRN
WHI WHIRED
SW4
BLK
RIGHT "KEEP WARM" HEATER
WHI WHI
WHI
WHI/GRN
P2-2
WHI
WHI
P3-3
BLK
RT
SOL
BLU BLU/BLK
WHI
WHI/GRN
RIGHT
BREW TIMER
P3-1
P3-2
SW6
WHI/GRN
WHI/GRN
WHIBLK
K1
WHIBLK
RIGHT TANK HEATER
BLK REDBLUBLKBLK
SW2
RT. LIMIT
THERMOSTAT
RT. SW. & THERMOSTAT
BLU BLK
K2 N.O.
LT. SW. & THERMOSTAT
BLU BLK
K1 N.O.
LEFT "KEEP WARM" HEATER
WHI WHI
BLU
BLU BLK
(FAUCET)
THERMAL
FUSE
MODELS 2/2 & 4/2 ONLY
MODELS 4/2 ONLY
WHI/BLU
T1 T5 T3
T1 T5 T3
WHI/BLU
T4
T2
T4
T2
GRN
N
L1
L2
WHI
BLK
RED
MAIN ON/OFF SWITCH
(Late Models only)
41711.1 052009
Page 59
WHI/RED
WHI/GRN
P1-2
P1-3
SCHEMATIC WIRING DIAGRAM CWTF TWIN 0/6 WITH
RECOVERY BOOSTER
L1
GREEN
(FAUCET)
THERMAL
SAFETY FUSE
BLKBLK
RIGHT TANK HEATER
BLKBLUBLKBLK
SW2
RT. LIMIT
THERMOSTAT
RT. READY INDICATOR
RT. SW. & THERMOSTAT
BLKRED
LEFT BREW WARMER
RIGHT BREW WARMER
WHI
P1-1
WHI/RED
WHI/GRN
WHI WHIRED
SW3
SW4
BLK
RIGHT "KEEP WARM" HEATER
WHI
WHI
RT
SOL
WHI
WHI/GRN
WHI/BLU
P3-2
WHI/GRN
WHI/GRN
LEFT TANK HEATER
L2
RED
RED
REDBLUBLKBLK
SW1
LT.LIMIT
THERMOSTAT
LT. READY INDICATOR
LT. SW. & THERMOSTAT
BLKRED
LEFT "KEEP WARM" HEATER
WHI
WHI/RED
WHI/RED
WHI/RED
P2-3
BLK
WHI
SW6
SW5
BLU BLU/BLK
LEFT
BREW TIMER
P2-1
WHI
P2-2
LT
SOL
P4-2
P4-3
27693.0000D 07/03 © 1996 BUNN-O-MATIC CORPORATION
120/240 VOLTS AC 3 WIRE
SINGLE PHASE
N
WHI
WHI
WHI
WHI
WHI
WHI
WHI
LEFT FRONT WARMER
LEFT REAR WARMER
SW9
RIGHT FRONT WARMER
P5-3
P5-2
SW10
BLK
RIGHT REAR WARMER
WHI
BRN/BLK
VIO
WHI
BLK
P3-1
P3-3
BLK
BLK
BLU
BLU/BLK
RIGHT
BREW TIMER
SW8
SW7
RED
RED
SW11
YEL
WHI/VIO
WHI
SW12
WHI
WHI
P5-1
BRN/BLK
VIO
WHI
WHI
WHI
YEL
WHI/VIO
WHI
P4-1
WHI/ORA
WHI/ORA
WHI
WHI/ORA
BLK
4
3
2
1
GRY
OPTIONAL
INDICATOR
TIMER
PNK
L.E.D.
L.E.D.
GRYPNK
WHI
WHI/ORA
K1
WHI
BLK
BLK
K2
BLK
WHI
BLU BLK
K.1. N.O.
BLU
K.2. N.O.
BLK
BLU
BLU
BLK
BLK
BLU
BLU
BLK
BLK
GRY
PNK
BLK
WHI/GRN
WHI/BLU
T1 T5 T3
T4
T2
T1 T5 T3
T4
T2
41711.1 052009
