BUNN
®
CW-APS
CW-APS
CWT-TS
CWT-TS
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION OF
CANADA LTD.
280 INDUSTRIAL PARKWAY SOUTH
AURORA, ONTARIO L4G 3T9
PHONE: (905) 841-2866 FAX: (905) 841-2775
10690.7000 1/99 ©1993 Bunn-O-Matic Corporation
INTRODUCTION
This equipment will brew a half-gallon batch of coffee into an awaiting dispenser. It can be easily configured
for either pour-over or automatic brewing. The automatic version may include a hot water faucet for allied beverage
use. It is only for indoor use on a sturdy counter or shelf.
WARRANTY
Bunn-O-Matic Corp. (“Bunn”) warrants the equipment manufactured by it to be commercially free from defects
in material and workmanship existing at the time of manufacture and appearing within one year from the date of
installation. In addition:
1.) Bunn warrants electronic circuit and/or control boards to be commercially free from defects in material and
workmanship for two years from the date of installation.
2.) Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material
and workmanship for two years from the date of installation.
3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory
screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever comes first.
This warranty does not apply to any equipment, component or part that was not manufactured by Bunn or that,
in Bunn’s judgement, has been affected by misuse, neglect, alteration, improper installation or operation, improper
maintenance or repair, damage or casualty.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR
ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of Bunn are
not authorized to make modifications to this warranty or to make additional warranties that are binding on Bunn.
Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and should not
be relied upon.
The Buyer shall give Bunn prompt notice of any claim to be made under this warranty by telephone at (905)
841-2866 or by writing to 280 Industrial Parkway South, Aurora, Ontario, L4G 3T9. 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
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.
!
WARNING
Fill water tank before turning -on
thermostat or connecting appliance
to power source.
Use only on a properly protected
circuit capable of the rated load.
Electrically ground the chassis.
Follow national/local electrical codes.
Do not use near combustibles.
# 00831.7000
FAILURE TO COMPLY RISKS EQUIPMENT
DAMAGE, FIRE, OR SHOCK HAZARD
READ THE ENTIRE OPERATING MANUAL
BEFORE BUYING OR USING THIS PRODUCT
THIS APPLIANCE IS HEATED WHENEVER
CONNECTED TO A POWER SOURCE
00831.0000F 3/98 © 1988 BUNN-O-MATIC CORPORATION
# 00658.7999
Page 3
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.
L2 Red
L2 RED
WHITE
NEUTRAL
L1 BLACK
120V.A.C.
120V.A.C.
120V.ac
208 or 240V.A.C.
120V.ac
208 or 240Vac
Neutral
White
WHITE
NEUTRAL
L1 BLACK
L1 Black
120V.A.C.
120 V.a.c
White
Neutral
L1 Black
Model 35 requires 3-
wire, grounded service
rated 120/208 or 120/240
volts ac, 20 amp, single
phase, 60 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
Models CW-APS & CWT-TS:
These models are completely portable and require no attached plumbing.
Models CWT-APS, CWTF-APS, CWT-TS, CWTF-TS:
These brewers must be connected to a cold water system with operating pressure between 20 and 90 psi from
a 1/2" or larger supply line. A shut-off valve should be installed in the line before the brewer. Install a regulator
in the line when pressure is greater than 90 psi to reduce it to 50 psi. The water inlet fitting is 1/4" flare.
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
PLUMBING REQUIREMENTS (cont.)
BE SURE TO INSTALL THE ABOVE
ASSEMBLY AS SHOWN
10165.0000D 6/93
© 1988 BUNN-O-MATIC CORPORATION
EARLY MODELS W/OUT FAUCET
Models CWT-APS, CWT-TS
1. Attach the flare fitting from the short piece of
tubing on the flow control (supplied) to the
water inlet fitting at the left rear of the brewer.
2. Flush the water line and securely attach it to the
flare fitting on the strainer.
3. Turn on the water supply.
BE SURE TO INSTALL THE ABOVE
ASSEMBLY AS SHOWN
10447.0000C 6/93 © 1989 BUNN-O-MATIC CORPORATION
FIRST TYPE MODELS W/FAUCET
FLOW
BE SURE TO INSTALL THE ABOVE
ASSEMBLY AS SHOWN
26225.0000A 4/95 © 1995 BUNN-O-MATIC CORPORATION
SECOND TYPE MODELS W/FAUCET
Models CWTF-APS, CWTF-TS:
1. Attach the flare fitting from the short piece of
tubing on the flow control (supplied) to the
lower water inlet fitting at the left rear of the
brewer.
2. Attach the flare fitting from the short piece of
tubing on the needle valve or tee (supplied) to
the upper water inlet fitting at the left rear side of
the brewer.
3. Flush the water line and securely attach it to the
flare fitting on the strainer or tee.
4. Turn on the water supply.
5. Place an empty vessel beneath the faucet and lift
the handle until water is dispensed.
Page 5
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. Models CW-APS & CW-TS:
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 CWT-APS, CWTF-APS, CWT-TS, CWTF-TS:
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. Models CW-APS & CW-TS:
Pour one pitcher of tap water into the screened area on top of the brewer.
6B. Models CWT-APS, CWTF-APS, CWT-TS, CWTF-TS:
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 and proceed as directed:
8A. Models CW-APS & CW-TS:
The brewer is now ready for use in accordance with the coffee brewing instructions on the next page.
8B. Models CWT-APS, CWTF-APS, CWT-TS, CWTF-TS:
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, disconnect the brewer from the power source, remove the front panel, and adjust the brew timer dial
up-or-down as required. Replace the front panel, connect the brewer to the power source, and allow the water
to reheat, start, and 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.
Page 6
OPERATING CONTROLS
Models CW-APS & CW-TS:
These models function without operating controls.
Models CWT-APS, CWTF-APS, CWT-TS, CWTF-TS:
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. Models CW-APS & CW-TS:
Pour one pitcher of tap water into the screened area on top of the brewer.
5B. Models CWT-APS, CWTF-APS, CWT-TS, CWTF-TS:
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
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 (CWTAPS, CWTF-APS, CWT-TS,
CWTF-TS)
PROBABLE CAUSE
1. No water
2. No power or incorrect voltage
to the brewer
3. ON/OFF Switch
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.
(B) Check circuit breakers or
fuses.
Refer to
for testing. See page 17
Service
- ON/OFF Switch
4. Start Switch
Page 8
Refer to
for testing procedures. See page
19
Service
- Start Switch
TROUBLESHOOTING (cont.)
PROBLEM
Brew cycle will not start (cont.)
(CWT-APS, CWTF-APS, CWT-TS,
CWTF-TS)
Water is not hot
PROBABLE CAUSE
5. Timer
6. Solenoid Valve
7. Water strainer/flow control
(.222 GPM)
1. Tank Heater Switch
2. Limit Thermostat
CAUTION - Do not eliminate or
bypass limit thermostat. Use
only BOM replacement part
#04680.0000
REMEDY
Refer to
testing procedures. See page 22
Refer to
for testing procedures. See page
18
(A) Direction of flow arrow must
be pointing towards brewer.
(B) Remove the strainer/flow
control and check for obstructions. Clear or replace.
Refer to
Switch for testing procedures.
See page 21
Refer to
stat for testing procedures. See
page 16
Service
Service
Service
Service
- Timer for
- Solenoid Valve
- Tank Heater
- Limit Thermo-
3. Control Thermostat
4. Tank Heater
Refer to
Thermostat for testing
procedures. See page 15
Refer to
for testing procedures. See page
19
Service
Service
- Control
- Tank Heater
Page 9
TROUBLESHOOTING (cont.)
PROBLEM
Inconsistent beverage level in
dispenser
PROBABLE CAUSE
1. Strainer /flow control (.222
GPM) (CWT-APS, CWTF-APS,
CWT-TS, CWTF-TS)
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 (CWT-APS,
CWTF-APS, CWT-TS, CWTF-TS)
Spitting or excessive steaming
4. Water Pressure (CWT-APS,
CWTF-APS, CWT-TS, CWTF-TS)
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.
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
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 (CWT-APS,
CWTF-APS, CWT-TS, CWTF-TS)
REMEDY
Refer to
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 18
Service
- Control
Water flows into tank continuously (ON/OFF Switch "ON")
Water flows into tank continuously (ON/OFF Switch "OFF")
Beverage overflows dispenser
1. Timer (CWT-APS, CWTF-APS,
CWT-TS, CWTF-TS)
1. Solenoid Valve (CWT-APS,
CWTF-APS, CWT-TS, CWTF-TS)
1. Dispenser
2. Timer (CWT-APS, CWTF-APS,
CWT-TS, CWTF-TS)
3. Solenoid Valve (CWT-APS,
CWTF-APS, CWT-TS, CWTF-TS)
Refer to
testing procedures. See page 22
Remove the Solenoid Valve and
clean any obstruction. Rebuild
or replace the valve if necessary.
See page 18
The dispenser must be completely empty before starting a
brew cycle.
Refer to
testing procedures. See page 22
Remove the Solenoid Valve and
clean any obstruction. Rebuild
or replace the valve if necessary.
See page 18
Service -
Service -
Timer for
Timer for
Page 11
TROUBLESHOOTING (cont.)
PROBLEM
Weak beverage
PROBABLE CAUSE
1. Filter Type
2. Coffee Grind
3. Sprayhead
4. Funnel Loading
5. Water Temperature
REMEDY
®
BUNN
Dry coffee grounds remain in
the funnel
Brewer is making unusal noises
(CWT-APS, CWTF-APS, CWTTS, CWTF-TS)
1. Funnel Loading
1. Solenoid
2. Plumbing Lines
3. Water Supply
Page 12
TROUBLESHOOTING (cont.)
PROBLEM
Brewer is making unusal noises
(cont.)(CWT-APS, CWTF-APS,
CWT-TS, CWTF-TS)
Brewer is making unusal noises
(CW)
PROBABLE CAUSE
4. Tank Heater
1. Tank Heater
REMEDY
Remove and clean lime off the
tank heater. See page 19
Remove and clean lime off the
tank heater. See page 19
Page 13
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 electrical 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.
All components are accessible by the removal of
the top cover and front inspection panel.
for assistance in determining the
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The front inspection panel is attached with six #6-
32 screws on APS and TS Models
Contents
Control Thermostat............................................. 15
Limit Thermostat ................................................ 16
ON/OFF Switch ................................................... 17
Solenoid (Inlet) ................................................... 18
Start Switch (Brew) ............................................ 19
Tank Heater ........................................................ 19
Tank Heater Switch ............................................. 21
Timer .................................................................. 22
Wiring Diagrams................................................. 24
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Page 14
SERVICE (cont.)
CONTROL THERMOSTAT
EARLY
MODELS
USE COPPER WIRE ONLY FOR
POWER SUPPLY CONNECTIONS
USE COPPER WIRE ONLY FOR
POWER SUPPLY CONNECTIONS
BUNN-O-MATIC
P/N 2235-120 VAC
MINUTES
.5
BUNN-O-MATIC
P/N 2235-120 VAC
Test Procedures:
1. Disconnect the brewer from the power source.
2. Locate the blue wire on the control thermostat.
3. Check the voltage across the blue wire on the
control thermostat and the white insert on two
pole 120 volt terminal block or three pole 120/
240 volt terminal blocks with a voltmeter. Connect
the brewer to the power source. The indication
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2
1
3
4
5
BUNN
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must be 120 volts ac for two wire 120 volt models
and three wire 120/240 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 harness.
5. Locate the black wire on the control thermostat.
6. Gently remove the capillary bulb and grommet
from the tank.
7. Check the voltage across the black wire of the
P1137
control thermostat and the white insert on the
two pole 120 volt or three pole 120/240 volt
terminal block with a voltmeter when the control
thermostat is turned "ON" (Fully clockwise).
Connect the brewer to the power source. The
indication must be 120 volts ac for two wire 120
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3
.5
MINUTES
4
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R
volt models and three wire 120/240 volt models.
8. Disconnect the brewer from the power source.
LATE
MODELS
P1127
Location:
Early Models: The control thermostat is mounted
on a bracket inside the hood on the right side just in
front of the tank lid.
Late Models: The control thermostat is located
inside the trunk on the left side of the component
bracket.
If voltage is present as described, reinstall the capillary
tube into the tank to the line 4.5" above the bulb, the
control thermostat is operating properly.
If voltage is not present as described, replace the
thermostat.
Removal and Replacement:
1. Remove wires from control thermostat leads.
2. Remove the thermostat capillary bulb by
firmlypulling-up on the capillary at the tank lid.
This will disengage the grommet from the tank
lid.
Page 15
SERVICE (cont.)
CONTROL THERMOSTAT (cont.)
3. Early Models: Remove the two #8-32 screws
securing control thermostat bracket mounted
inside the hood.
Late Models: Remove the one #8-32 screw securing the control thermostat to the component
bracket in 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 position.
NOTE - The capillary tube must be clear of any electrical
termination and not kinked.
7. Early Models: Using two #8-32 screws secure the
control thermostat inside the hood.
Late Models. Using one #8-32 screw secure the
control thermostat to the component bracket
inside the trunk.
8. Refer to the illustration below when reconnecting
the wires.
9. Adjust the control thermostat as required.
LIMIT THERMOSTAT
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READ
P1130
USE COPPER WIRE ONLY FOR
POWER SUPPLY CONNECTIONS
BUNN-O-MATIC
P/N 2235-120 VAC
2
1
3
.5
MINUTES
4
5
N
N
U
B
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.
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 terminals.
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 illustration below when reconnecting
the wires.
BLU to BLU Lead from
Limit Thermostat
BLK to BLK Lead fromTank Heater
(Brewers W/Out Faucet)
BLK toThermal Cut-Off from Tank
Heater (Brewers with Faucet)
P1129
Page 16
BLU to BLU Lead from
Control Thermostat
BLK to Tank
Heater Switch
P1130
SERVICE (cont.)
ON/OFF SWITCH
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FAILURE TO COMPLY RISKS INJURY
PN: 00658.0000D 3/97 © 1985 BUNN-O-MATIC CORPO
Location:
The ON/OFF switch is located on the left front of
the hood.
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 illustration below when reconnecting
the wires.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Viewing the switch from the back remove the
white wire from the upper terminal and the black
wire from the center terminal.
3. Check the voltage across the white wire and the
black wire with a voltmeter. Connect the brewer
to the power source. The indication must be 120
volts ac for two wire 120 volt models and three
wire 120/240 volt models.
4. Disconnect the brewer from the power source.
If voltage is present as described, reconnect the white
and proceed to #5.
If voltage is not present as described, refer to the
Wiring Diagrams
and check the brewer wiring har-
ness.
5. With the black wire removed, remove the white/
red 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 white/red
to the lower terminal.
Page 17
SERVICE (cont.)
SOLENOID VALVE
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P1127
USE COPPER WIRE ONLY FOR
POWER SUPPLY CONNECTIONS
BUNN-O-MATIC
P/N 2235-120 VAC
2
1
3
.5
MINUTES
4
5
N
N
U
B
Location:
The solenoid valve is located inside the trunk on
the center lower 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 120 volts
ac for two wire 120 volt models and three wire
120/240 volt models.
4. Disconnect the brewer from the power source,
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
blockage 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 solenoid mounting bracket to the component bracket.
Remove solenoid bracket and solenoid valve as
an assembly.
5. Remove the two #10-32 screws and lockwashers
securing the solenoid valve to the solenoid bracket.
6. Using two #10-32 screws and lockwashers install 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.
If voltage is present as described, proceed to #5
If voltage is not present as described, refer to
Diagrams
and check brewer wiring harness.
Wiring
5. Check for continuity across the solenoid valve
coil terminals.
If continuity is present as described, reconnect the
white and black wire from the timer.
If continuity is not present as described, replace the
solenoid valve.
P1132
Page 18
SERVICE (cont.)
F
1
2
3
4
5
.5
MINUTES
BUNN-O-MATIC
P/N 2235-120 VAC
USE COPPER WIRE ONLY FOR
POWER SUPPLY CONNECTIONS
BUNN
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START SWITCH
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P-150
Location:
The start switch is located in the front of the
hood just to the right of center.
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
P1127
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, 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 19
SERVICE (cont.)
TANK HEATER (Cont.)
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 wire 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.
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 spayhead 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).
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.
WHI to Terminal Block
(White Insert on 120V
Two Wire Models)
Red to Terminal Block
(Red Insert on 120/240V
Three Wire Models)
BLK to Control Thermostat
(Brewers W/Out Faucet)
BLK to Fuse (Brewers W/Faucet)
P1134CAN
Page 20
SERVICE (cont.)
should not be present in the "OFF" lower position.
TANK HEATER SWITCH
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W
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P1127
USE COPPER WIRE ONLY FOR
POWER SUPPLY CONNECTIONS
P/N 2235-120 VAC
BUNN-O-MATIC
2
1
3
.5
MINUTES
4
5
N
N
U
B
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.
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 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
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 sup-
ply to the brewer.
1. On automatic brewers gently remove the fill tube
from back of fill basin.
2. Remove the tank inlet fitting securing fill basin
the tank lid. Remove fill basin and gasket. Set all
three parts aside for reassembly.
3. On brewers with faucets, disconnect the water
supply to coil assembly and remove the tube
from the tank to the faucet.
4. Remove sprayhead and hex nut securing
sprayhead tube to the hood. Set aside for reassembly.
5. Disconnect the wires on the limit thermostat and
the tank heater and the control thermostat (early
models).
6. Gently pull the thermostat sensor and grommet
from the tank lid.
7. 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.
8. Gently reinstall the thermostat sensor and grommet in the tank lid.
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 the tank heater
switch terminals.
Page 21
SERVICE (cont.)
TANK HEATER SWITCH (cont.)
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
sections in this manual when reconnecting wires.
17. Brewers with faucet reinstall the faucet tube and
reconnect the water supply tube to the coil assembly.
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 supply.
23. Refer to the illustration below when reconnecting
the wires.
TIMER
BLK to Limit Thermostat
BLK to Terminal Block
(Black Insert)
P1135
Page 22
SERVICE (cont.)
TIMER (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 120 volts ac for two wire 120
volt models and three wire 120/240 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 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
8. Disconnect on black and white wires to the solenoid.
9. 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 120 volts ac for
approximately 20 seconds for two wire 120 volt
models and three wire 120/240 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:
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.
WHI to Solenoid Valve
BLK to Solenoid Valve
P1136
Page 23
SCHEMATIC WIRING DIAGRAM FOR CW, CWT, CWTF - APS,
SCHEMATIC WIRING DIAGRAM FOR CW, CWT, CWTF, CWTF-APS, TS
L1
HEATER
HEATER SWITCH
SWITCH
BLK BLK
BLK
LIMIT THERMOSTAT
THERMOSTAT
BLK
LIMIT
WHI
BLK
OPTIONAL AUTOMATIC BREW CIRCUIT
OPTIONAL AUTOMATIC BREW CIRCUIT
ON/OFF
ON/OFF SWITCH
SWITCH
BLK
BLK
WHI/RED
READY INDICATOR
BLU
SW. & THERMOSTAT
BLU
BLU
SW. & THERMOSTAT
WHI/RED
TS,TSR
READY INDICATOR
BLK
BLKBLU
THERMOSTAT
50W
"KEEP WARM" HEATER
MODELS CWT35-TS, CWTF35-TS, CWT35-APS, CWTF35-APS, 3500W @ 240v
START SWITCH
START SWITCH
WHI/RED
WHI/RED
P1, P2, & P3 ARE PINS OF A
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
POLARIZED THREE-PIN
CONNECTOR
CONNECTOR.
GREEN
GREEN
(FAUCET
OPTION ONLY)
(FAUCET OPTION ONLY)
THERMAL FUSE
THERMAL
FUSE
BLK
BLK
MODEL 15 1320W @ 120V
MODELS CW15, CWT15, CWTF15, 1150W @ 120V
MODEL 20 1800W @ 120V
MODELS CW20, CWT20, CWTF20, 1450W @ 120V
MODELS CW35, CWT35, CWTF35, 3500W @ 240V
MODEL 35 3500W @ 240V
MODELS CW15-TS, CW20-TS, CW15-APS, CW20-APS,
CWT15-TS, CWT20-TS, CWT15-APS, CWT20-APS,
CWTF15-TS, CWTF20-TS, CWTF15-APS, CWTF20-APS, 1450W @ 120V
TANK HEATER
TANK HEATER
BLK
BLK
AUXILIARY OUTLET
WHI (MODELS 15 & 20)
WHI (MODELS 15 & 20)
RED (MODEL 35)
RED (MODEL 35)
(200 WATT MAXIMUM)
P1
BLU
BLU BLU
P1
BLU
BREW
BREW
TIMER
TIMER
BLK
P3
P3
BLK
BLK
SOL
SOL
WHI
WHIBLK
WHI
WHI
L2NL1
L2
N
WHI
WHI
WHI
WHI
P2
P2
WHI
WHI
120/240 VOLTS AC 3 WIRE
120/240 VOLTS AC 3 WIRE
120 VOLTS AC 2 WIRE
120 VOLTS AC 2 WIRE
SINGLE PHASE
SINGLE PHASE
10693.0000C 9/96 © 1993 BUNN-O-MATIC CORPORATION
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