Bunn CS, CT, CWTF, CRT, CRTF User Manual

C, CT, CTF,

CWT, CWTF

OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: [phone] FAX: [phone]

www.bunnomatic.com

WARRANTY

Bunn-O-Matic Corp. (“Bunn”) warrants the equipment manufactured by it to be commercially free from defects
in material and workmanship existing at the time of manufacture and appearing within one year from the date of
installation. In addition:

1.) Bunn warrants electronic circuit and/or control boards to be commercially free from defects in material and

workmanship for three years from the date of installation.

2.) Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material

and workmanship for two years from the date of installation.

3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory

screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever comes first.

This warranty does not apply to any equipment, component or part that was not manufactured by Bunn or that,
in Bunn’s judgement, has been affected by misuse, neglect, alteration, improper installation or operation, improper
maintenance or repair, damage or casualty.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR
ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of Bunn are

not authorized to make modifications to this warranty or to make additional warranties that are binding on Bunn.
Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and should not
be relied upon.

The Buyer shall give Bunn prompt notice of any claim to be made under this warranty by telephone at (217)
529-6601 or by writing to Post Office Box 3227, Springfield, Illinois, 62708-3227. If requested by Bunn, the Buyer
shall ship the defective equipment prepaid to an authorized Bunn service location. If Bunn determines, in its sole
discretion, that the equipment does not conform to the warranty, Bunn shall repair the equipment with no charge
for parts during the warranty period and no charge for labor by a Bunn Authorized Service Representative during
the warranty period. If Bunn determines that repair is not feasible, Bunn shall, at its sole option, replace the
equipment or refund the purchase price for the equipment.

THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE
OF THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AS
SPECIFIED HEREIN, TO REPAIR OR, AT BUNN’S SOLE OPTION, REPLACEMENT OR REFUND.

In no event shall Bunn be liable for any other damage or loss, including, but not limited to, lost profits, lost sales,
loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute
equipment, facilities or services, or any other special, incidental or consequential damages.

Page 2

10841 042401

USER NOTICES

Carefully read and follow all notices in this manual and on the equipment. All labels on the equipment should

be kept in good condition. Replace any unreadable or damaged labels.

Page 3

10841 071000

ELECTRICAL REQUIREMENTS

CAUTION - The brewer must be disconnected from the power source until specified in

Model 15 has an attached cordset and requires 2-wire grounded service rated 120 volts ac, 15 amp, single

phase, 60 Hz.

Initial Set-Up.

Model 20 requires 2-wire,
grounded service rated 120 volts
ac, 20 amp, single phase, 60 Hz.
Proceed as follows:

Model 35 requires 3-wire,

grounded service rated 120/208 or
120/240 volts ac, 20 amp, single
phase, 60 Hz. Proceed as follows:

“A" & "B” models require 2-

wire, grounded service rated 200
volts ac or 230 volts ac, 20 amp,
single phase, 50 Hz. Proceed as
follows:

Electrical Hook-Up
CAUTION – Improper electrical installation will damage electronic components.

1. An electrician must provide electrical service as specified.

2. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.

3. Place the heater switch at the rear of the brewer in the “OFF” lower position.

4. Remove the front panel beneath the sprayhead.

5. Feed the cord through the strain relief and connect it to the terminal block.

6. Connect the brewer to the power source and verify the voltage at the terminal block before proceeding.

Replace the front panel.

7. If plumbing is to be hooked-up later be sure the brewer is disconnected from the power source. If plumbing

has been hooked-up, the brewer is ready for Initial Set-Up.

PLUMBING REQUIREMENTS

Model C:

This model is completely portable and requires no attached plumbing.

Models CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB

These brewers must be connected to a cold water system with operating pressure between 20 and 90 psi (138
to 620kPa) from a 1⁄2" or larger supply line. A shut-off valve should be installed in the line before the brewer. Install
a regulator in the line when pressure is greater than 90 psi (620kPa)to reduce it to 50 psi (345kPa). The water inlet
fitting is 1⁄4" flare.

NOTE - Bunn-O-Matic recommends 1⁄4" copper tubing for installations of less than 25 feet and 3⁄8" for more than
25 feet from the 1⁄2" water supply line. A tight coil of copper tubing in the water line will facilitate moving the brewer
to clean the countertop. Bunn-O-Matic does not recommend the use of a saddle valve to install the brewer. The
size and shape of the hole made in the supply line by this type of device may restrict water flow.

This equipment must be installed to comply with the Basic Plumbing Code of the

Building Officials and Code Administrators International, Inc. (BOCA)

and the Food Service Sanitation Manual of the Food and Drug Administration (FDA).

Page 4

10841 071000

PLUMBING REQUIREMENTS (cont.)

MODELS W/OUT FAUCET

MODELS W/FAUCET

Models CT, CWT, CTF & CWTF

1. Flush the water line and securely attach it to the flare fitting on the strainer or tee.

2. Turn on the water supply.

3. On CTF and CWTF Models, place an empty vessel beneath the faucet and lift the handle until water is
dispensed.

Page 5

10841 071000

INITIAL SET-UP

CAUTION - The brewer must be disconnected from the power source throughout the initial set-up, except

when specified in the instructions.

1. Insert an empty funnel into the funnel rails.

2. Place an empty dispenser under the funnel.

3. Place the heater switch at the rear of the brewer in the “OFF” lower position and connect the brewer to the
power source.

4. Fill the tank with water as directed:

4A. Model C

Pour three pitchers of tap water into the screened area on top of the brewer. Allow approximately two minutes
between pitchers for water to flow into the tank. While the third pitcher of water is entering the tank, the tank
will fill to capacity and the excess will flow from the sprayhead, out of the funnel, and into the dispenser.

4B. Models CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB

Connect the brewer to the power source, place the "ON/OFF" switch in the "ON" upper position, and
momentarily press and release the start switch. Water will begin flowing into the tank. When water stops
flowing into the tank, initiate a second and a third brew cycle. During the third brew cycle the tank will fill to
its capacity and the excess will flow from the sprayhead, out of the funnel, and into the dispenser.

5. When the flow of water from the funnel stops, place the heater switch at the rear of the brewer in the “ON”
upper position and wait approximately twenty minutes for the water in the tank to heat to the proper
temperature. Some water will drip from the funnel during this time; this is due to expansion and should not
occur thereafter.

6. Empty the dispenser and initiate another brew cycle as directed:

6A. Model C

Pour one pitcher of tap water into the screened area on top of the brewer.

6B. Models CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB

Place the "ON/OFF" switch in the "ON" upper position, and momentarily press and release the start switch.

7. Place the "ON/OFF" switch in the lower “OFF” position after water has stopped flowing from the funnel, and
let the water in the tank reheat to the proper temperature.

8. Empty the dispenser; place the "ON/OFF" switch in the "ON" upper position, and momentarily press and release
the start switch. Check the water volume in the dispenser after water has stopped flowing from the funnel.
It should be 64 ounces.

9. If not, adjust the brew timer as required. See
measure another brew cycle.

10. Repeat step 9 until 64 oz water volume is achieved.

11. The brewer is now ready for use in accordance with the coffee brewing instructions on the next page.

Adjusting Brew Volumes

. Allow the water to reheat, start, and

ADJUSTING BREW VOLUMES

CAUTION - Disconnect the power source from the brewer prior to the removal of any panel for the replacement

or adjustment of any component.
NOTE: Prior to setting or modifying batch sizes, check that the brewer is connected to water supply, the tank is
properly filled, and a funnel and server are in place.

1. Modifying batch sizes. To modify a batch volume, first check that the SET/LOCK switch is in the “SET”

position on the circuit board.
To increase a batch size. Press and hold the START or BREW switch until three clicks are heard. Release the
switch (Failure to release the switch within two seconds after the third click causes the volume setting to be
aborted and previous volume setting will remain in memory) and press it again one or more times. Each time

Page 6

10841 071000

the switch is pressed, two seconds are added to the brew time period. Allow the brew cycle to finish in order
to verify that the desired volume has been achieved.
To decrease a batch size. Press and release the START or BREW switch once for every two-second interval
to be removed from the total brew time period; then immediately press and hold down the START or BREW
switch until three clicks are heard. Release the switch. (Failure to release the switch within two seconds after
the third click causes the volume setting to be aborted and previous volume setting will remain in memory).

Allow the brew cycle to finish in order to verify that the desired volume has been achieved.

OPERATING CONTROLS

Model C
ON/OFF SWITCH

Placing the "ON/OFF" switch in the "ON" upper position supplies power to the brew station warmer.

Models CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB
ON/OFF SWITCH

Placing the "ON/OFF" switch in the "OFF" lower position 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. Placing the
switch in the "ON" upper position supplies power to the brew station warmer and enables the brew circuit.

START SWITCH

Momentarily pressing and releasing the switch starts a brew cycle when the "ON/OFF" switch is in the "ON" upper
position.

NOTE – The "ON/OFF" switch must be in the "ON" upper position to initiate and complete a brew cycle.

COFFEE BREWING

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 an empty dispenser beneath the funnel.

5. Operate the brewer as directed:

5A. Model C

Pour one pitcher of tap water into the screened area on top of the brewer.

5B. Models CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB

Place the "ON/OFF" switch in the "ON" upper position. Momentarily press and release the start switch.

6. When brewing is completed, simply discard the grounds and filter.

CLEANING

1. The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all

surfaces on Bunn-O-Matic equipment.

2. Check and clean the sprayhead. The sprayhead holes must always remain open.

3. With the sprayhead removed, insert the deliming spring (provided) all the way into the sprayhead tube. When

inserted properly, no more than two inches of spring should be visible. Saw back and forth five or six times.

NOTE – In hard water areas, this may need to be done daily. It will help prevent liming problems in the brewer
and takes less than a minute.

Page 7

10841 071000

TROUBLESHOOTING

A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems

encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.

• Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.

• All electronic components have 120 volt ac and low voltage dc potential on their terminals. Shorting of
terminals or the application of external voltages may result in board failure.

• Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. If an
intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a
terminal or crimp.

• Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are
energized for more than ten minutes without a supply of water.

• The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will help
to avoid twists and kinks in the tubing.

• Make certain that all plumbing connections are sealed and electrical connections tight and isolated.

• This brewer is heated at all times. Keep away from combustibles.

WARNING – • Exercise extreme caution when servicing electrical equipment.

• Unplug the brewer when servicing, except when electrical tests are specified.

• Follow recommended service procedures

• Replace all protective shields or safety notices

PROBLEM

Brew cycle will not start (CT,
CTF, CWT, CWTA, CWTB, CWTF,
CWTFA & CWTFB)

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 terminals on three
wire 120/240 volt brewers.
(A3) Check the terminal block for
200 volts on "B Series" brewers
or 230 volts on "A Series" brew­ers across the red and black
terminals.

Page 8

(B) Check circuit breakers or
fuses.

10841 071000

TROUBLESHOOTING (cont.)
PROBLEM

Brew cycle will not start (cont.)
(CT, CTF, CWT, CWTA, CWTB,
CWTF, CWTFA & CWTFB)

PROBABLE CAUSE

3. ON/OFF Switch

4. Start Switch

5. Timer

6. Solenoid Valve

7. Water strainer/flow control
(.222 GPM)

REMEDY

Refer to

Service

- ON/OFF Switch

for testing. See page 17

Refer to

Service

- Start Switch for

testing procedures. See page 20

Refer to

Service

- Timer for testing

procedures. See page 23

Refer to

Service

- Solenoid Valve
for testing procedures. See page
19

(A) Direction of flow arrow must
be pointing towards brewer.

(B) Remove the strainer/flow con­trol and check for obstructions.
Clear or replace.

Water is not hot

1. Tank Heater Switch

2. Limit Thermostat
CAUTION - Do not eliminate or
bypass limit thermostat. Use BOM
replacement part #29329.1000

3. Control Thermostat

4. Tank Heater

Refer to

Service

- Tank Heater
Switch for testing procedures. See
page 22

Refer to

Service

- Limit Thermo­stat for testing procedures. See
page 16

Refer to

Service

- Control Ther­mostat for testing procedures. See
page 15

Refer to

Service

- Tank Heater for

testing procedures. See page 20

Page 9

10841 071000

TROUBLESHOOTING (cont.)

PROBLEM

Inconsistent beverage level in
dispenser

PROBABLE CAUSE

1. Strainer/flow control (.222
GPM) (CT,CTF, CWT, CWTA,
CWTB, CWTF, CWTFA &
CWTFB)

2. Syphon System

3. Lime Build-up
CAUTION - Tank and tank
components should be delimed
regularly depending on local
water conditions. Excessive
mineral build-up on stainless
steel surfaces can initiate corro­sive reactions resulting in
serious leaks.

REMEDY

(A) Direction of flow arrow must
be pointing towards the brewer.

(B) Remove the strainer/flow
control and check for obstruc­tion. 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.

Consistently low beverage level
in the dispenser (CT, CTF, CWT,
CWTA, CWTB, CWTF, CWTFA &
CWTFB)

Spitting or excessive steaming

4. Water Pressure (CT, CTF,
CWT, CWTA, CWTB, CWTF,
CWTFA & CWTFB)

1. Timer

2. Strainer/flow Control (.222
GPM)

1. Lime Build-up
CAUTION - Tank and tank
components should be delimed
regularly depending on local
water conditions. Excessive
mineral build-up on stainless
steel surfaces can initiate corro­sive reactions resulting in
serious leaks.

The water pressure to the
brewer must be at least 20 psi
(138 kPa).

Timer dial must indicate 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 obstruc­tions. Clear or replace.

Inspect tank assembly for
excessive lime deposits. Delime
as required.

Page 10

10841 071000

TROUBLESHOOTING (cont.)
PROBLEM

Spitting or excessive steaming
(cont.)

Dripping from sprayhead

PROBABLE CAUSE

2. Control Thermostat

1. Syphon System

2. Lime Build-up
CAUTION - Tank and tank com­ponents should be delimed
regularly depending on local
water conditions. Excessive
mineral build-up on stainless
steel surfaces can initiate corro­sive reactions resulting in
serious leaks.

3. Solenoid Valve (CT, CTF,
CWT, CWTA, CWTB, CWTF
CWTFA & CWTFB)

REMEDY

Refer to

Service

- Control
Thermostat for testing proce­dures. See page 15

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.
See page 19

Water flows into tank continu­ously (ON/OFF Switch "ON")

Water flows into tank continu­ously (ON/OFF Switch "OFF")

Beverage overflows dispenser

1. Timer (CT, CTF, CWT, CWTA,
CWTB, CWTF, CWTFA & CWTFB)

1. Solenoid Valve (CT, CTF,
CWT, CWTA, CWTB, CWTF,
CWTFA & CWTFB)

1.Dispenser

2. Timer (CT, CTF, CWT, CWTA,
CWTB, CWTF, CWTFA & CWTFB)

3. Solenoid Valve (CT, CTF,
CWT, CWTA, CWTB, CWTF,
CWTFA & CWTFB)

Refer to

Service -

Timer for

testing procedures. See page 23

Remove the Solenoid Valve and
clean any obstruction. Rebuild
or replace the valve if necessary.
See page 19

The dispenser must be com­pletely empty before starting a
brew cycle.

Refer to

Service -

Timer for

testing procedures. See page 23

Remove the Solenoid Valve and
clean any obstruction. Rebuild
or replace the valve if necessary.
See page 19

Page 11

10841 091596

TROUBLESHOOTING (cont.)
PROBLEM

Weak beverage

PROBABLE CAUSE

1. Filter Type

2. Coffee Grind

3. Sprayhead

4. Funnel Loading

5. Water Temperature

REMEDY

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 spray­head 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 ther­mometer. The reading should not
be less than 195°F (76°C). Adjust
the control thermostat to increase
the water temperature. Replace if
necessary.

Dry coffee grounds remain in
the funnel

Brewer is making unusal noises
(CT, CTF, CWT, CWTA, CWTB,
CWTF, CWTFA & CWTFB)

1. Funnel Loading

1. Solenoid

2. Plumbing Lines

3. Water Supply

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 ap­proximately 50 psi (345 kPa).

Page 12

10841 012600

TROUBLESHOOTING (cont.)

PROBLEM

Brewer is making unusal noises
(cont.)(CT, CTF, CWT, CWTA,
CWTB, CWTF, CWTFA & CWTFB)

Brewer is making unusal noises
(C)

Low beverage serving tempera­ture

PROBABLE CAUSE

4. Tank Heater

1. Tank Heater

1. Warmer

REMEDY

Remove and clean lime off the
tank heater. See page 20

Remove and clean lime off the
tank heater. See page 20

Refer to

Service -

Warmer
element for testing procedures.
See page 27

Page 13

10841 071000

CAUTION

DISCARD DECANTER
IF:

. CRACKED
. SCRATCHED
. BOILED DRY
. HEATED WHEN EMPTY
. USED ON HIGH FLAME
. OR EXPOSED ELECTRIC
ELEMENTS

FAILURE TO COMPLY RISKS INJURY

PN:

658

1985 BUNN-O-MATIC CORP

ORATION

FUNNEL CONTENTS
ARE HOT

CAUTION

DISCARD DECANTER
IF:

. CRACKED
. SCRATCHED
. BOILED DRY
. HEATED WHEN EMPTY
. USED ON HIGH FLAME
. OR EXPOSED ELECTRIC
ELEMENTS

FAILURE TO COMPLY RISKS INJURY

PN: 658

1985 BUNN-O-MATIC CORPORATION

FUNNEL CONTENTS
ARE HOT

SERVICE

This section provides procedures for testing and
replacing various major components used in this
brewer should service become necessary. Refer to

Troubleshooting

cause of any problem.
WARNING - Inspection, testing, and repair of electri-

cal equipment should be performed only by qualified
service personnel. The brewer should be unplugged
when servicing, except when electrical tests are re­quired and the test procedure specifically states to
plug-in the brewer.

COMPONENT ACCESS
WARNING - Disconnect the brewer from the power

source before the removal of any panel or the replace­ment of any component.

for assistance in determining the

A

C

!

FUNNEL CONTENTS
ARE HOT

FAILURE TO COMPLY RISKS INJURY

8
5
: 6

N
P

T

U

DISCARD DECANTER
IF:

R
. C
C
S
.
O
B
.
E
H
.
S
U
.
R
O
.
L
E

85
9
1

N

IO

D
E

D

K

E

C

H

A

C

Y

T

R

A

N

D

R

E

D

H

E

W

H

IL

D

G
I

E

H

T

E

A

N

D

O

E

D

S

E

O
P
X

S

T

E

N
E

M
E

CO

IC
T
A

M

-

-O
N

N
U
B

POUR IN WATER ONLY

Y
T
P

M

E

E

M
A

C

I

L

R

F

T
C

E
L

N
O

I
T
A

R
O
P

R

®

N

N

U

B

R
E

W

O

L

S

R

E

M

R

A

W

ION :

UT

CA

S
E
I

R

E

S

C

Y

READ

T

O

H

E

R

A

S

E

C

A

F

R

U

S

D

N

A

MODEL C

All components are accessible by the removal of
the top cover, front inspection panel and warmer
plate(s).

The top cover is attached with one #4-40 screw.

The front inspection panel is attached with four #6­32 screws.

The warmer assembly is attached with three #4-40
screws.

Contents

Control Thermostat............................................. 15

Limit Thermostat ................................................ 16

ON/OFF Switch.................................................... 17

Solenoid (Inlet) ................................................... 19

Start Switch (Brew) ............................................ 20

Tank Heater ........................................................ 20

Tank Heater Switch.............................................22

Timer ..................................................................23

Warmer Element ................................................. 27

Wiring Diagrams................................. 28, 29 & 30

S
E
I

R

E

S

W

C

READY

N
O

I

ECANTER

T

D D

U

AR

A

C

DISC

!

IF:

KED

PTY

RAC

TCHED

RY

ME

. C

N EM

RA

D

HE

. SC

H FLA

W

OILED

LECTRIC

. B

E

EATED

SED

. H
SED ON HIG

PO

. U

TS

Y

R EX

EN
. O
ELEM

RATION

S INJUR

TENTS

ISK

TIC CORPO

T

-O-MA

MPLY R

E HO

FUNNEL CON

1985 BUNN

E TO CO

AR

FAILUR

8

: 65

PN

B

CAUTION :

N

N

U

T
R
A
T

S

R

E
W
O

L

/
N
O

T

E HO

AR

CES

D SURFA

ERS AN

WARM

MODEL CWT

P1152

Page 14

10841 07100

Page 15

BLU to BLU Wire from
Limit Thermostat

BLK to BLK Wire fromTank Heater
(Brewers W/Out Faucet)
BLK toThermal Cut-Off from Tank
Heater (Brewers with Faucet)

Page 16

CAUTION

DISCARD DECANTER
IF:

CAUTION

DISCARD DECANTER
IF:

CAUTION

DISCARD DECANTER
IF:

CAUTION

DISCARD DECANTER
IF:

SERVICE (cont.)

ON/OFF SWITCH - MODEL C

POUR IN WATER ONLY

R

E

T

N

N

A

C

IO

E

T

D

D

U

R

A

A

C

C

IS

D
:

!

IF

C

!

N

IO

T

D

U

R

A

A

C

IS

D
:

IF

POUR IN WATER ONLY

R

E

T

N

A

C

E

D

C SERIES

Y

D

A

E

®

N

N

U

B

LOWER

R

ONE LOWER WARMER

C SERIES

Y

D

A

E

®

N

N

U

B

LOWER

LOWER

R

TOP

ONE LOWER & ONE UPPER WARMER

ON/OFF SWITCH - MODEL CWT

BUNN

BUNN

S

IE

R

E

S

W

C

Y

D

A

RE

T

R

A

T

S

R

E

W

O

L

/

N

O

ONE LOWER WARMER

S

IE

R

E

S

W

C

Y

D

A

E

R

T

R

A

T

S

R

E

W

O

L

/

N

O

ONE LOWER & ONE UPPER WARMER

C

!

C

!

N

IO

T

D

U

R

A

A

C

IS

D
:

IF

N

IO

T

D

U

R

A

A

C

IS

D
:

IF

POUR IN WATER ONLY

R

E

T

N

A

C

E

D

POUR IN WATER ONLY

R

E

T

N

A

C

E

D

C SERIES

D

A

E

®

N

N

U

B

LOW

( LEFT OR RIGHT) OR ONE LOWER

AND TWO UPPER WARMERS

®

N

N

U

B

O

L

P

O

T

ONE UPPER & THREE LOWER

WARMERS (LEFT OR RIGHT)

R

EAR

E-R

ID

-S

T

N

O

FR

R

E

THREE LOWER WARMERS

C SERIES

D

A

E

R

R

A

E

-R

E

ID

-S

T

N

O

R

F

R

E

W

S

S

IE

IE
R

R

E

E
S

S

W

W
C

C

Y

Y
D

D

A

A
E

E

R

R

BUNN

BUNN

T

T

R

R

A

A

T

T

S

S

R

R

E

E

W

W

O

O

L

L

/

/

N

N

O

O

Y

Y

THREE LOWER WARMERS OR
ONE LOWER & TWO UPPER WARMERS

S

IE

R

E

S

W

C

Y

D

A
E

R

BUNN

T

R

A

T

S

R

E

W

O

L

/

N

O

ONE UPPER & THREE
LOWER WARMERS

P1156

P1155

Location:

The ON/OFF switch(s) are located on the front of

the hood.

Page 17

10841 091596

SERVICE (cont.)

ON/OFF SWITCH (cont.)

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 230 volts ac for two wire 200 or 230 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 har-

ness.

WHI to Terminal Block (White
Insert on 120V or 120/240V
Models)
RED to Terminal Block (Red
Insert on 200V or 230V
Models)

BLK to Terminal Block (Black
Insert)

Terminal #1 (See chart below)

P1918

Connect wire to Terminal #1 as follows:

Lower Warmer........................................................WHI/RED

One Top Warmer ............................................................. VIO

Two Top Warmers

(Front) .................................................................... BRN/BLK

(Rear) .............................................................................. VIO

Two Top Warmers (1 Switch)..........................................VIO

Side Warmers

(Front) .................................................................... BRN/BLK

(Rear) .............................................................................. VIO

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 wire to the
lower terminal.
If continuity is not present as described, replace the
switch.

Removal and Replacement:

1. Remove the wires from the switch terminals.

2. Compress the clips inside the hood and gently
push the switch through the opening.

3. Push the new switch into the opening and spread
the clips to hold switch in the hood.

4. Refer to the following illustration when recon­necting the wires.

Page 18

10841 071000

Page 19

SERVICE (cont.)

F

START SWITCH - CT & CWT

Location:

The start switch is located in the center front

of the hood.

Test Procedure:

1. Disconnect the brewer from the power supply.

2. Disconnect the blue wire from the top switch
terminal and the white/red from the bottom switch
terminal.

3. Check for continuity across the two terminals on
the switch when it is held in the lower position.
Continuity must not be present across these
terminals in the upper position.

BLU to BLU Lead
from Timer P1

WHI/RED to ON/OF
Switch

P1133

TANK HEATER

If continuity is present as described, reconnect the
blue wire to the top terminal and the white/red to the
bottom terminal.
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. Compress the clips inside the hood and gently
push the switch through the opening.

3. Push new switch into the opening and spread the
clips to hold the start switch in the hood.

4. Refer to the following illustration when recon­necting the wires.

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 230 volt models with a voltmeter. Connect
the brew to the power source. The indication
must be:
a) 120 volts ac for two wire 120 volt 15 and 20
amp models .
b) 240 volts ac for three wire 120/240 volt
models.

Page 20

SERVICE (cont.)
TANK HEATER (Cont.)

c) 200 to 230 volts ac for two wire 200 or 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 the

Wiring Diagrams

and check wiring harness.

4. Disconnect the black wire and the white or red
wire from the tank heater terminals.

5. Check for continuity across the tank heater termi­nals.

If continuity is present as described, reconnect the
wires, the tank heater is operating properly.
If continuity is not present as described, replace the
tank heater.

NOTE- If the tank heater remains unable to heat,
remove and inspect heater for cracks in the sheath.

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.

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 the illustration below when reconnecting
the tank heater wires.

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 brew­ers 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 reas­sembly.

7. Remove the eight #8-32 nuts securing the tank
lid to the tank.

8. Remove the tank lid with limit thermostat,
sprayhead tube, tank heater, coil assembly and
control thermostat w/bracket (early models only).

WHI to Terminal
Block (White Insert on
120V Two Wire
Models)
RED to Terminal
Block (Red Insert on
120/240V Threee wire
Models or 200V and
230V Two Wire
Models)

BLK to Control
Thermostat (Brewers
W/Out Faucet) Thermal
Cut-Off to BLK from
Control Thermostat
(Brewers W/Faucet

P1168

Page 21

10841 071000

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 thermo­stat.

3. With the tank heater switch in the "ON" position
check the voltage between the black wire re­moved from the limit thermostat and the white
wire or red wire on the tank heater with a voltme­ter. Connect the brewer to the power source. The
indication must be:
a) 120V volts ac on two wire 120 volt models.
b) 240 volts ac on three wire 120/240 volt mod­els.
c) 200 to 230 volts ac on 200 volt or 230 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

ness.

and check the brewer wiring har-

5. Check for continuity between the black wire re­moved from the limit thermostat and the black
insert on the terminal block. with the tank heater
switch in the "ON" upper position. 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. (BUNN-O-MATIC has
#12440 syphon assembly available for this pur­pose.

9. Gently reinstall the thermostat sensor and grom­met in the tank lid.

10. Remove the two #8-32 screws securing the tank
assembly to the hood.

11. Lift tank and components out as an assembly and
set aside for reassembly.

12. Disconnect the two black wires from the tank
heater switch.

13. 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.

14. Insert new tank heater switch through the hole in
the upper left rear of the trunk and secure with

Page 22

SERVICE (cont.)
TANK HEATER SWITCH (cont.)

switch indicator/guard bracket, hex facenut and
plastic facenut.

15. Reconnect the two black wires to the tank heater
switch terminals.

16. Set tank assembly inside the hood on mounting
brackets and secure with two #8-32 screws.

17. Reconnect the wires to the limit thermostat, tank
heater and the control thermostat. Refer to limit
thermostat, tank heater and control thermostat
sections in this manual when reconnecting wires.

18. Brewers with faucet reinstall the faucet tube and
reconnect the water supply tube to the coil as­sembly.

19. Secure the sprayhead tube to the hood using hex
nut.

20. Install sprayhead.

21. Install fill basin, inlet gasket and secure to tank lid
with tank inlet fitting.

22. Carefully install water fill tube into the back of
the fill basin.

23. Reconnect and turn on the incoming water sup­ply.

24. Refer to the illustration below when reconnecting
the wires.

BLK to Limit Thermostat

BLK to Terminal Block
(Black Insert)

P1135

DIAL TIMER (Early Models) - CT & CWT

S
E
I

R

E

S

W

C

Y

D

A

E

2

1

3

.5

BUNN-O-MATIC

P/N 2235-120 VAC

MINUTES

4

5

USE COPPER WIRE ONLY FOR

POWER SUPPLY CONNECTIONS

Dial Timer

N

N

U

B

ARMERS AND SURFACES

W

N :

TIO

CAU

R

T

AR

ST

ER

W

/LO
N
O

T

ARE HO

P1153

Location:

The timer is located inside the front of the

trunk on the upper right side of component bracket.

Test Procedure (Dial Timer).

1. Disconnect the brewer from the power source.

2. Disconnect the polarized, three pin connector
from the brewer wiring harness and rotate the
brew timer dial fully counterclockwise.

3. Check the voltage across sockets P2 & P3 (white
and black wires) of the female connector with a
voltmeter when the "ON/OFF" 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 230 volts ac on two wire 200 volt or 230
volt models.

4. Disconnect the brewer from the power source.

Page 23

If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the
Wiring Diagrams and check the brewer wiring
harness.

5. Check the voltage across the sockets P1 & P2
(blue and white wires) of the female connector

10841 071000

SERVICE (cont.)

DIAL TIMER (Early Models) (cont.)

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:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac for two wire 200 volt or 230
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 #7
If voltage is not present as described, refer to Wiring
Diagrams and check the brewer wiring harness.

3 Install new timer on component bracket securing

with one #8-32 screw.

4. Refer to the illustration below when reconnect­ing the wires.

5. Readjust the timer dial as required.

2

1

3

.5

BUNN-O-MATIC

P/N 2235-120 VAC

MINUTES

4

5

To Main Wiring Harness

WHI to Solenoid Valve

BLK to Solenoid Valve

7. Disconnect the black and white wires from the
solenoid.

8. Check the voltage across the black and white
wires with a voltmeter when the "ON/OFF" switch
is in the "ON" position (upper) and the "START"
switch is pressed to the "START" position (lower)
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 230 volts ac for approximately 20
seconds for two wire 200 volt or 230 volt models.

If voltage is present as described, the brew timer is
operating properly. Reset the timer dial as required,
to obtain the desired brew volume.
If voltage is not present as described, replace the
timer.

Removal and Replacement (Dial Timer):

1. Disconnect the timer socket from the brewer
wiring harness and the timer leads from the
solenoid valve.

2. Remove the one #8-32 screw securing timer to
component bracket.

Dial Timer

P1136

Page 24

10841 071000

SERVICE (cont.)
DIGITAL BREW TIMER (Late Models)

DIGITAL BREW TIMER

P2203.45

6. With a voltmeter, check the voltage across termi­nals TL1 and TL4 when the "ON/OFF" switch is in
the "ON" position. Connect the brewer to the power
source. The indication must be 0 volts.

If voltage is as described, proceed to #7.
If voltage is not as described, disconnect the brewer
from the power source and replace the timer.

7. With a voltmeter, check the voltage across termi­nals TL1 and TL4 when the "ON/OFF" switch is in
the "ON" position. Connect the brewer to the power
source 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 230 volts ac on two wire 200 volt or 230
volt models.

Location:

The timer is located inside the front of the trunk on

the upper right side of component bracket.

Test Procedure (Digital Timer):
NOTE: Do not remove or install wires while timer
board is installed. Pressure applied to one side may
cause damage to the board.

1. Disconnect the brewer from the power source and
remove the front access panel.

2. Remove the #8-32 screw securing circuit board to
the mounting bracket.

3. Remove circuit board and spacers (as required).

4. With a voltmeter, check the voltage across termi­nals TL1 and TL2 when the "ON/OFF" switch is in
the "ON" position. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac on two wire 200 volt or 230
volt models.

5. Disconnect the brewer from the power source.

If voltage is present as described, the brew timer is
operating properly. Reset the timer as required, to
obtain the desired brew volume.
If voltage is not present as described, disconnect the
brewer from the power source and replace the timer.

Removal and Replacement (Digital Timer):

1. Remove the #8-32 screw securing circuit board to
the mounting bracket.

2. Remove circuit board and spacers (as required).

3. Remove all wires from the timer.

If voltage is present as described, proceed to #6.
If voltage is not present as described, refer to the

Wiring Diagrams

and check the brewer wiring har-

ness.

Page 25

10841 071000

SERVICE (cont.)
DIGITAL BREW TIMER (Late Models)(cont.)

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 below.

Timer Setting (Digital):
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.

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
approximately 50 ounces is reached, turn the ON/OFF
switch to “OFF”.
NOTE: Several ounces of water will continue to sy­phon from the tank after turning the switch “OFF”.
The brewer remembers this volume and will continue
to brew batches of this size until the volume setting
procedure is repeated.
NOTE: When brewing coffee, volume will decrease due
to absorption by the coffee grounds.

1. Modifying brew volumes. To modify a brew vol-

ume, first check that the SET/LOCK switch is in the
“SET” position on the circuit board.

To increase a brew volume, place the ON/OFF

switch in the “ON” position, press and hold the START
switch until three clicks are heard. Release the switch
and press it again one or more times. (Failure to re­lease the switch within two seconds after the third
click causes the volume setting to be aborted and pre­vious volume setting will remain in memory) Each time
the switch is pressed, two seconds are added to the
brew time period. Allow the brew cycle to finish in
order to verify that the desired volume has been
achieved.

To decrease a brew volume, place the ON/OFF

switch in the “ON” position, press and release the
START switch once for every two-second interval to
be removed from the total brew time period; then im­mediately press and hold down the START switch until
three clicks are heard. Release the switch. (Failure to
release the switch within two seconds after the third
click causes the volume setting to be aborted and pre­vious volume setting will remain in memory). Allow
the brew cycle to finish in order to verify that the de­sired volume has been achieved.

2. Setting brew volumes. To set a brew volume,

first check that the SET/LOCK switch is in the “SET”
position on the circuit board. Place the ON/OFF switch
in the “ON” position, press and hold the START switch

Page 26

3. Setting programming disable feature. If it be­comes necessary to prevent anyone from changing
brew time once programmed, you can set the SET/
LOCK switch to the “LOCK” position. This will pre­vent any further programming until switch is once
again put into the “SET” position.

BLU/BLK wire from TL5 to P1
WHI/GRN wire from TL4 to Solenoid
WHI/BLU wire from TL3 to Solenoid
WHI wire from TL2 to P2
BLK wire from TL1 to P3

P2037

DIGITAL TIMER WIRING

10841 071000

SERVICE (cont.)
WARMER ELEMENT(S)

If continuity is present as described, reconnect the
white or red and white/red, and brown/black or violet
wires on the warmer element.
If continuity is not present as described, 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 termi­nals.

7. Securely install warmer assembly on the brewer.

8. Refer to the illustration below when reconnecting
the wires.

P1158

Location:

The warmer element(s) is located under the

warmer plate.

Test Procedures:

1. Disconnect the brewer from the power source.

2. Use the white or red wire to the terminal block and
the white/red, brown/black or violet wire to the
"ON/OFF" switch.

3. Check voltage across the white or red and white/
red, brown/black or violet with a voltmeter with the
"ON/OFF" switch in the "ON" position. The indica­tion must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac for two wire 200 or 230 volt
models.

4. Disconnect the brewer from the power source.

WHI/RED to ON/OFF Switch (One Lower Warmer)
BRN/BLK to ON/OFF Switch (Top Front Warmer
or Side Warmer)
VIO to ON/OFF Switch (Top Rear Warmer or
Rear Side Warmer)

WHI to Terminal Block (120V
or 120/240V Brewers)
RED to Terminal Block (200V or
230V Brewers)

P1159

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 the continuity across the two terminals on
the warmer element.

Page 27

10841 071000

SCHEMATIC WIRING DIAGRAM C, CT & CWT

L1

BLK

HEATER
SWITCH

BLK

LIMIT

THERMOSTAT

BLU

READY

BLU

SW. & THERMOSTAT

BLK

(FAUCET

OPTION ONLY)

THERMAL

FUSE

BLK

BLK

GRN

TANK HEATER

WHI (MODELS 15 & 20)

RED (MODEL 35)

N L2

3
1

WHI/RED

GRY

PNK

WHI

INDICATOR

TIMER

"KEEP WARM" HEATER

OPTIONAL AUTOMATIC BREW CIRCUIT

4
3
2
1

OPTIONAL DUAL WARMER ASSY (TOP OR SIDE)

BLK

BLK

OPTIONAL SINGLE TOP WARMER ASSY

WHI/RED

WHI/RED

2

2

ON/OFF

SWITCH

2

OPTIONAL FRESH LIGHT SYSTEM

L.E.D.

120/240 VOLTS AC 3 WIRE

120 VOLTS AC 2 WIRE

BLK

2

SINGLE PHASE

10836.0000E 07/00 ©1995 BUNN-O-MATIC CORPORATION

WHI/RED
WHI/ORA

START SWITCH

P1

BLU/BLK

BLU

P3

BLK

P1, P2, & P3 ARE PINS OF A

POLARIZED THREE-PIN

CONNECTOR.

3
1

BRN/BLK

3
1

VIO

3
1

P2

BRN/BLK

P3

VIO WHI

P3

T1 T5 T3

BREW
TIMER

FRONT

VIO

REAR

VIO

REAR

LOWER WARMER

SOL

WHI/BLU

WHI/GRN

T4
T2

WHI

WHI

P2

P1

P1

WHI
WHI

WHIBLK

WHI

WHI

WHI

WHI
WHI

WHI

WHI

Page 28

10841 071000

SCHEMATIC WIRING DIAGRAM CWTB

L1

HEATER
SWITCH

BLK

ON/OFF SWITCH

2

BLK

3
1

200 VOLTS AC 2 WIRE

THERMOSTAT

WHI/RED

LIMIT

BLU

OPTIONAL DUAL WARMER ASSY (TOP OR SIDE)

2

BLK

2

BLK

OPTIONAL SINGLE TOP WARMER ASSY

2

BLK

SINGLE PHASE

10836.0002E 07/00 ©1995 BUNN-O-MATIC CORPORATION

READY

BLU

SW. & THERMOSTAT

OPTIONAL AUTOMATIC BREW CIRCUIT

START SWITCH
WHI/RED

WHI/RED

P1, P2, & P3 ARE PINS OF A

POLARIZED THREE-PIN

CONNECTOR.

3
1

BRN/BLK

3
1

VIO

3
1

VIO RED

BLK

P2

P3

P3

(FAUCET

OPTION ONLY)

THERMAL

FUSE

BLK

P1

BLU

BLU/BLK

P3

BLK

BRN/BLK

VIO

VIO

BLK

WHI/RED

T1 T5 T3

BREW
TIMER

FRONT

REAR

REAR

GRN/YEL

TANK HEATER

LOWER WARMER

SOL

WHI/BLU

WHI/GRN

T4
T2

WHI

RED

P2

P1

P1

L2

RED

RED

REDBLK

RED

RED

RED
RED

RED

RED

Page 29

10841 071000

SCHEMATIC WIRING DIAGRAM CWTA

L1

BLK

HEATER
SWITCH

BLK

LIMIT

THERMOSTAT

BLU

READY

BLU

SW. & THERMOSTAT

BLK

(FAUCET

OPTION ONLY)

THERMAL

FUSE

BLK

BLK

GRN/YEL

TANK HEATER

L2

RED

ON/OFF

SWITCH

2

220-240 VOLTS AC

2 WIRE

SINGLE PHASE

3
1

WHI/RED

WHI

"KEEP WARM"

OPTIONAL AUTOMATIC BREW CIRCUIT

START SWITCH
WHI/RED

WHI/RED

P1, P2, & P3 ARE PINS OF A

POLARIZED THREE-PIN

CONNECTOR.

OPTIONAL DUAL WARMER ASSY (TOP OR SIDE)

3

2

BLK

2

BLK

OPTIONAL SINGLE TOP WARMER ASSY

2

BLK

1

BRN/BLK

3
1

VIO

3
1

VIO RED

10836.0003E 07/00 ©1995 BUNN-O-MATIC CORPORATION

P2

P3

P3

P1

BLU

P3

BLK

BRN/BLK

VIO

VIO

WHI/RED

BLU/BLK

T1 T5 T3

BREW
TIMER

WHI/BLU

T4
T2

FRONT

REAR

REAR

LOWER WARMER

SOL

WHI/GRN

WHI

P1

RED

P1

P2

WHI
RED

REDBLK

RED

RED

RED
RED

RED

RED

Page 30

10841 071000

L1

BLK

HEATER
SWITCH

SCHEMATIC WIRING DIAGRAM

CWTF, CWTFB NO WARMER

BLK

LIMIT

THERMOSTAT

BLU

READY INDICATOR

BLU

SW. & THERMOSTAT

BLK

(FAUCET

OPTION ONLY)

THERMAL

FUSE

BLKBLK

GRN

TANK HEATER

N L2

WHI (MODELS 15 & 20)

RED (MODEL 35)

ON/OFF

SWITCH

BLK

OPTIONAL FRESH LIGHT SYSTEM

WHI

WHI/RED

GRY

L.E.D.

PNK

INDICATOR

TIMER

BLK

120/240 VOLTS AC 3 WIRE
100-120 VOLTS AC 2 WIRE

SINGLE PHASE

"KEEP WARM" HEATER

4
3

2
1

WHI/ORA

OPTIONAL AUTOMATIC BREW CIRCUIT

START SWITCH

WHI/RED

WHI/RED

P1, P2, & P3 ARE PINS OF A

POLARIZED THREE-PIN

CONNECTOR.

P1

BLU BLU

P3

BLK

BLK

BREW
TIMER

SOL

WHI
WHI

P2

WHI
WHI

WHI

WHI

Page 31

10841 042401

L1

SCHEMATIC WIRING DIAGRAM

CWTFA NO WARMER

READY INDICATOR

BLU

BLK

GRN

L2

HEATER

SWITCH

BLK

RED

BLK

ON/OFF

SWITCH

BLK

OPTIONAL FRESH LIGHT SYSTEM

BLK

BLK

WHI/RED

GRY

L.E.D.

PNK

LIMIT

THERMOSTAT

230 VOLTS AC

2 WIRE

SINGLE PHASE

BLU

WHI

INDICATOR

TIMER

SW. & THERMOSTAT

"KEEP WARM" HEATER

4
3

2
1

THERMAL

FUSE

OPTIONAL AUTOMATIC BREW CIRCUIT

START SWITCH

WHI/RED

WHI/RED

P1, P2, & P3 ARE PINS OF A

POLARIZED THREE-PIN

CONNECTOR.

TANK HEATER

BLKBLK

BLU BLU

P3

WHI/ORA

P1

BLK

WHI

BLK

BREW
TIMER

RED

SOL

WHI
WHI

THERMAL

FUSE

P2

RED

RED

WHI

WHI

Page 32

10841 042401