®
BUNN
CW-APS,
CWT-TS &
CWT-TSR
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
10690.0000F 8/00 ©1993 Bunn-O-Matic Corporation
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.
#00831.0000
#00656.0000
#00658.0000
10690 021800
Page 3
ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up.
Model 15 has an attached cordset and requires 2-wire grounded service rated 120 volts ac, 15 amp, single
phase, 60 Hz.
L2 RED
WHITE
WHITE
120V A.C.
208 OR 240V A.C.
WHITE
NEUTRAL
L1 BLACK
NEUTRAL
L1 BLACK
120V A.C.
100V A.C.
NEUTRAL
L1BLACK
120V A.C.
Model 35 requires 3-
wire, grounded service
rated120/208or120/240
volts ac, 20 amp, single
phase, 60 Hz. Proceed as
follows:
Model 20 requires 2-
wire, grounded service
rated 120 volts ac, 20
amp, single phase, 60 Hz.
Proceed as follows:
“A" & "B” models re-
quire 2-wire, grounded
service rated 200 volts ac
or 240 volts ac, 20 amp,
single phase, 50 Hz. Pro-
ceed as follows:
"B”modelsrequire2-
wire, grounded service
rated 100 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. Connectthebrewertothepowersourceandverifythevoltageattheterminalblockbeforeproceeding. 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, CWT-TSR & CWT-TSR
These brewers must be connected to a cold water system with operating pressure between 20 and 90 psi (138
1
and620kPa)froma ⁄2"orlargersupplyline. Ashut-offvalveshouldbeinstalledinthelinebeforethebrewer. Install
a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345 kPa). The water
1
inlet fitting is ⁄4" flare.
1
3
NOTE - Bunn-O-Matic recommends ⁄4" copper tubing for installations of less than 25 feet and ⁄8" for more than
1
25 feet from the ⁄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).
10690 021800
Page 4
PLUMBING REQUIREMENTS (cont.)
SECOND TYPE MODELS W/FAUCET
EARLY MODELS W/OUT FAUCET
1. Flush the water line and securely attach it to the
flare fitting on the strainer.
2. Turn on the water supply.
THIRD TYPE MODELS W/FAUCET
Models CWTF-APS, CWTF-TS CWTF-TSR:
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. Place an empty vessel beneath the faucet and lift
the handle until water is dispensed.
FIRST TYPE MODELS W/FAUCET
10690 081100
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, CWT-TSR & CWTF-TSR
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, CWT-TSR & CWTF-TSR
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 “OFF” (lower) 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 CWA-PS & 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, CWT-TSR & CWTF-TSR
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 as
required. See Adjusting Brew Volumes. 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 following pages.
10690 062300
Page 6
ADJUSTING BREW VOLUMES
CAUTION - Disconnect the power source from the brewer prior to the removal of any panel for the replacement
or adjustment of any component.
NOTE: Prior to setting or modifying batch sizes, check that the brewer is connected to water supply, the tank is
properly filled, and a funnel and server are in place.
1. Modifying batch sizes. To modify a batch volume, first check that the SET/LOCK switch is in the “SET”
position on the circuit board.
To increase a batch size. Press and hold the START or BREW switch until three clicks are heard. Release the
switch (Failure to release the switch within two seconds after the third click causes the volume setting to be
aborted and previous volume setting will remain in memory) and press it again one or more times. Each time
the switch is pressed, two seconds are added to the brew time period. Allow the brew cycle to finish in order
to verify that the desired volume has been achieved.
To decrease a batch size. Press and release the START or BREW switch once for every two-second interval
to be removed from the total brew time period; then immediately press and hold down the START or BREW
switch until three clicks are heard. Release the switch. (Failure to release the switch within two seconds after
the third click causes the volume setting to be aborted and previous volume setting will remain in memory).
Allow the brew cycle to finish in order to verify that the desired volume has been achieved.
2. Setting batch sizes. To set a batch volume, first check that the SET/LOCK switch is in the “SET” position on
the circuit board. Press and hold the START or BREW switch until three distinct clicks are heard, and then
release the switch. (Failure to release the switch within two seconds after the third click causes the volume
setting to be aborted and previous volume setting will remain in memory). View the level of the liquid being
dispensed. When the desired level is reached, turn the ON/OFF switch to “OFF” (lower). The brewer remem-
bers this volume and will continue to brew batches of this size until the volume setting procedure is repeated.
NOTE: When brewing coffee, batch volumes will decrease due to absorption by the coffee grounds.
3. Setting programming disable feature. If it becomes necessary to prevent anyone from changing brew times
once programmed, you can set the SET/LOCK switch to the “LOCK” position. This will prevent any program-
ming to be done until switch is once again placed in the “SET” position.
OPERATING CONTROLS
Models CW-APS & CW-TS:
These models function without operating controls.
Models CWT-APS, CWTF-APS, CWT-TS, CWTF-TS, CWT-TSR & CWTF-TSR
ON/OFF SWITCH
Placingthe"ON/OFF"switchinthe"OFF"(lower)positionstopsbrewing. Stoppingabrewcycleafterithasbeen
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 enable 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.
10690 062300
Page 7
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, CWT-TSR & CWTF-TSR
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.
10690 062300
Page 8
TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems
encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.
•
•
Inspection, testing, andrepairofelectricalequipmentshouldbeperformedonlybyqualifiedservicepersonnel.
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.
Theuseoftwowrenchesisrecommendedwheneverplumbingfittingsaretightenedorloosened. Thiswillhelp
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
PROBABLE CAUSE
1. No water
REMEDY
Brew cycle will not start (CWT-
APS,CWTF-APS,CWT-TS,CWTF-
TS, CWT-TSR &CWTF-TSR)
Waterlinesandvalvestothebrewer
must be open.
2.Nopowerorincorrectvoltageto
the brewer
(A1) Check the terminal block for
120 volts across the black and
white terminals on two wire 120
volt brewers.
(A2) Check the terminal block for
120 volts across the red and white
terminals and the black and white
terminal on three wire 120/240
volt brewers.
(A3) Check the terminal block for
200 volts on "B Series" brewers or
240 volts on "A Series" brewers
across the red and black termi-
nals.
(A4) Check the terminal block for
100 volts on "B Series" brewers
across the white and black termi-
nals.
(B)Checkcircuitbreakersorfuses.
10690 091596
Page 9
TROUBLESHOOTING (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
Refer to Service - ON/OFF Switch
for testing. See page 18
Brew cycle will not start (cont.)
(CWT-APS, CWTF-APS, CWT-TS,
CWTF-TS, CWT-TSR &CWTF-
TSR)
3. ON/OFF Switch
Refer to Service - Start Switch for
testing procedures. See page 20
4. Start Switch
5. Timer
RefertoService-Timerfortesting
procedures. See page 25 or 27
Refer to Service - Solenoid Valve
for testing procedures. See page
19
6. Solenoid Valve
(A) Direction of flow arrow must
be pointing towards brewer.
7. Water strainer/flow control
(.222 GPM)
(B) Remove the strainer/flow con-
trol and check for obstructions.
Clear or replace.
Refer to Service - Tank Heater
Switchfortestingprocedures.See
page 23
Water is not hot
1. Tank Heater Switch
Refer to Service - Limit Thermo-
stat for testing procedures. See
page 17
2. Limit Thermostat
CAUTION - Do not eliminate or
bypass limit thermostat. Use only
BOM
replacement
part
#29329.1000
Refer to Service - Control Ther-
mostatfortestingprocedures.See
page 16
3. Control Thermostat
Refer to Service - Tank Heater for
testing procedures. See page 21
4. Tank Heater
10690 062300
Page 10
TROUBLESHOOTING (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
Inconsistentbeveragelevelindis-
penser
1. Strainer /flow control (.222
GPM) (CWT-APS, CWTF-APS,
CWT-TS, CWTF-TS, CWT-TSR &
CWTF-TSR
(A) Direction of flow arrow must
be pointing towards the brewer.
(B) Remove the strainer/flow con-
trol and check for obstruction.
Clear or replace.
2. Syphon System
Thebrewermustbelevelorslightly
lower in front to syphon properly.
3. Lime Build-up
Inspect the tank assembly for ex-
cessive lime deposits. Delime as
required.
CAUTION-Tankandtankcompo-
nentsshouldbedelimedregularly
depending on local water condi-
tions. Excessive mineral build-up
on stainless steel surfaces can
initiatecorrosivereactionsresult-
ing in serious leaks.
4. Water Pressure (CWT-APS,
CWTF-APS, CWT-TS, CWTF-TS,
CWT-TSR & CWTF-TSR)
The water pressure to the brewer
must be at least 20 psi (138 kPa).
Consistently low beverage level in
the dispenser (CWT-APS, CWTF-
APS, CWT-TS, CWTF-TS, CWT-
TSR & CWTF-TSR)
1. Timer
Timer must activate solenoid for
at least two minutes and fifteen
seconds.
2. Strainer/flow Control (.222
GPM)
(A) Direction of flow arrow must
be pointing towards brewer.
(B) Remove the strainer/flow con-
trol and check for obstructions.
Clear or replace.
Spitting or excessive steaming
1. Lime Build-up
Inspect tank assembly for exces-
sive lime deposits. Delime as re-
quired.
CAUTION-Tankandtankcompo-
nentsshouldbedelimedregularly
depending on local water condi-
tions. Excessive mineral build-up
on stainless steel surfaces can
initiatecorrosivereactionsresult-
ing in serious leaks.
10690 062300
Page 11
TROUBLESHOOTING (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
2. Control Thermostat
Spitting or excessive steaming
(cont.)
Refer to Service - Control Ther-
mostatfortestingprocedures.See
page 16
1. Syphon System
Dripping from sprayhead
Thebrewermustbelevelorslightly
lower in front to syphon properly.
2. Lime Build-up
Inspect the tank assembly for ex-
cessive lime deposits. Delime as
required.
CAUTION - Tank and tank compo-
nents should be delimed regularly
depending on local water condi-
tions. Excessive mineral build-up
on stainless steel surfaces can ini-
tiate corrosive reactions resulting
in serious leaks.
3. Solenoid Valve (CWT-APS,
CWTF-APS, CWT-TS, CWTF-TS,
CWT-TSR & CWTF-TSR)
Remove the solenoid valve and
clear any obstructions. Rebuild or
replace the valve if necessary.
See page 19
1. Timer (CWT-APS, CWTF-APS,
CWT-TS, CWTF-TS, CWT-TSR &
CWTF-TSR)
Waterflowsintotankcontinuously
(ON/OFF Switch "ON")
RefertoService-Timerfortesting
procedures. See page 25 or 27
1. Solenoid Valve (CWT-APS,
CWTF-APS, CWT-TS, CWTF-TS,
CWT-TSR & CWTF-TSR)
Waterflowsintotankcontinuously
(ON/OFF Switch "OFF")
Remove the Solenoid Valve and
clean any obstruction. Rebuild or
replace the valve if necessary. See
page 19
1. Dispenser
Beverage overflows dispenser
Thedispensermustbecompletely
emptybeforestartingabrewcycle.
2. Timer (CWT-APS, CWTF-APS,
CWT-TS, CWTF-TS, CWT-TSR &
CWTF-TSR)
RefertoService-Timerfortesting
procedures. See page 25 or 27
3. Solenoid Valve (CWT-APS,
CWTF-APS, CWT-TS, CWTF-TS,
CWT-TSR & CWTF-TSR)
Remove the Solenoid Valve and
clean any obstruction. Rebuild or
replace the valve if necessary. See
page 19
10690 062300
Page 12
TROUBLESHOOTING (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
Weak beverage
1. Filter Type
BUNN® paper filters must be
used for proper extraction.
2. Coffee Grind
3. Sprayhead
A fine or drip grind must be used
for proper extraction.
A six-hole stainless steel spray-
head must be used for proper
extraction.
4. Funnel Loading
The BUNN® paper filter must be
centered in the funnel and the bed
of ground leveled by gentle shak-
ing.
5. Water Temperature
Placeanemptyfunnelonanempty
dispenser beneath the sprayhead.
Initiate a brew cycle and check the
water temperature immediately
below the sprayhead with a ther-
mometer. The reading should not
be less than 195°F. Adjust the
control thermostat to increase the
watertemperature.Replaceifnec-
essary.
Dry coffee grounds remain in the
funnel
1. Funnel Loading
1. Solenoid
The BUNN® paper filter must be
centered in the funnel and the bed
ofgroundsleveledbygentlyshak-
ing.
Brewer is making unusal noises
(CWT-APS,CWTF-APS,CWT-TS,
CWTF-TS,CWT-TSR,CWTF-TSR)
The nut on the solenoid must be
tight or it will vibrate during op-
eration.
2. Plumbing Lines
3. Water Supply
Plumbing lines should not resting
on the counter top.
(A)Thebrewermustbeconnected
to a cold water line.
(B) Water pressure to the brewer
must not exceed 90 psi (620 kPa).
Install a regulator if necessary to
lower the working pressure to ap-
proximately 50 psi (345 kPa).
10690 021800
Page 13
TROUBLESHOOTING (cont.)
PROBLEM
REMEDY
PROBABLE CAUSE
Remove and clean lime off the
tank heater. See page 21
Brewer is making unusal noises
(cont.)(CWT-APS, CWTF-APS,
CWT-TS, CWTF-TS, CWT-TSR,
CWTF-TSR)
4. Tank Heater
Remove and clean lime off the
tank heater. See page 21
Brewer is making unusal noises
(CW)
1. Tank Heater
10690 062300
Page 14
SERVICE
This section provides procedures for testing and
replacing various major components used in this
brewer should service become necessary. Refer to
Troubleshooting for assistance in determining the
cause of any problem.
WARNING - Inspection, testing, and repair of electri-
cal equipment should be performed only by qualified
service personnel. The brewer should be unplugged
when servicing, except when electrical tests are re-
quired and the test procedure specifically states to
plug-in the brewer.
COMPONENT ACCESS
WARNING - Disconnect the brewer from the power
source before the removal of any panel or the replace-
ment of any component.
CW-APS
All components are accessible by the removal of
the top cover and front inspection panel.
The top cover is attached with one #4-40 screw.
The front inspection panel is attached with six #6-
32 screws on APS and TS Models and eight #6-32
screws on and TSR Models
Contents
CWT-TS
Control Thermostat............................................. 16
Limit Thermostat ................................................ 17
ON/OFF Switch.................................................... 18
Solenoid (Inlet) ................................................... 19
Start Switch (Brew) ............................................ 20
Tank Heater ........................................................ 21
Tank Heater Switch............................................. 23
Timer (Early Models) .......................................... 25
Digital Timer (Late Models) ................................ 27
Wiring Diagrams.................................... 29 thru 33
CWT-TSR
P1126.30
FIG. 1 COMPONENT ACESS
10690 062300
Page 15
SERVICE (cont.)
Test Procedures:
CONTROL THERMOSTAT
1. Disconnect the brewer from the power source.
2. Locate the blue wire on the control thermostat.
3. Withavoltmeter,checkthevoltageacrosstheblue
wire on the control thermostat and the white in-
sert on two pole 100 or 120 volt terminal block or
threepole120/240voltterminalblocksandthered
insert on two wire 200 volt or 240 volt terminal
block. Connect the brewer to the power source.
The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 240 volts ac for two wire 200 or 240 volt
models.
c) 100 volts ac for two wire 100 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.
EARLY
MODELS
P1137.40
5. Locate the black wire on the control thermostat.
6. Gently remove the capillary bulb and grommet
from the tank.
7. With a voltmeter, check the voltage across the
black wire of the control thermostat and the white
insert on the two pole 100 or 120 volt or three pole
120/240 volt terminal block and the red insert on
the two pole 200 volt or 240 volt terminal block
when the control thermostat is turned "ON" (Fully
clockwise). Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 240 volts ac for two wire 200 volt or 240
volt models.
c) 100 volts ac for two wire 100 volt models.
8. Disconnect the brewer from the power source.
LATE
MODELS
Ifvoltageispresentasdescribed,reinstallthecapillary
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.
P1127.40
FIG. 2 CONTROL THERMOSTAT
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.
10690 062300
Page 16
LIMIT THERMOSTAT
SERVICE (cont.)
CONTROL THERMOSTAT (cont.)
Removal and Replacement:
1. Remove wires from control thermostat leads.
2. Remove the thermostat capillary bulb by firmly
pulling up on the capillary at the tank lid. This will
disengage the grommet from the tank lid.
3. Early Models: Remove the two #8-32 screws se-
curing control thermostat bracket mounted inside
the hood.
Late Models: Remove the one #8-32 screw secur-
ingthecontrolthermostattothecomponentbracket
in the trunk.
P1127.40
FIG. 4 LIMIT THERMOSTAT
Location:
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.
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. Withanohmmeter,checkforcontinuityacrossthe
limit thermostat terminals.
6. Carefully bend the capillary tube so that the tube
andbulbinsidethetankareintheverticalposition.
NOTE - The capillary tube must be clear of any electri-
cal termination and not kinked.
If continuity is present as described, the limit
thermostat is operating properly.
If continuity is not present as described, replace the
limit thermostat.
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 in-
side the trunk.
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.
8. Refer to Fig. 3 when reconnecting the wires.
9. Adjust the control thermostat as required.
4. Refer to Fig. 5 when reconnecting the wires.
BLUtoBLUWirefromLimitTher-
mostat
BLU to BLU Lead from
Control Thermostat
BLK to Tank
Heater Switch
BLKtoBLKWirefromTankHeater
(Brewers W/Out Faucet)
BLKtoThermalCut-Offfrom Tank
Heater (Brewers with Faucet)
P1800
FIG. 5 LIMIT THERMOSTAT TERMINALS
P1129
FIG. 3 CONTROL THERMOSTAT TERMINALS
10690 062300
Page 17
SERVICE (cont.)
ON/OFF SWITCH
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" (upper) posi-
tion. Continuity must not be present when the
switch is in the "OFF" (lower) position.
If continuity is present as described, reconnect the
blackwiretothecenterterminalandthewhite/redwire
to the lower terminal.
If continuity is not present as described, replace the
switch.
P0150.40
FIG. 6 ON/OFF SWITCH
Location:
The ON/OFF switch is located on the left front of
the hood.
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.
Test Procedure:
3. Push the new switch into the opening and spread
the clips to hold switch in the hood.
4. Refer to Fig. 7 when reconnecting the wires.
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. With a voltmeter, check the voltage across the
white wire and the black wire. Connect the brewer
to the power source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 240 volts ac for two wire 200 or 240 volt
models.
c) 100 volts ac for two wire 100 volt models.
4. Disconnect the brewer from the power source.
WHI to Terminal Block (White
Insert on 100V, 120V or
120V/240V Models)
Red to Terminal Block (Red Insert
on 200V or 240V Models)
BLK to Terminal Block
(Black Insert)
If voltage is present as described, reconnect the white
wire and proceed to #5.
WHI/RED to Timer P3
P1131
FIG. 7 ON/OFF SWITCH TERMINALS
10690 062300
Page 18
SERVICE (cont.)
If continuity is not present as described, replace the
solenoid valve.
SOLENOID VALVE
6. Check the solenoid valve for coil action. Connect
the brewer to the power source. With "ON/OFF"
switch in the "ON" (upper) position press start
switch and listen carefully in the vicinity of the
solenoid valve for a" clicking" sound as the coil
magnet attracts.
7. Disconnect the brewer from the power source.
If the sound is heard as described and water will not
pass through the solenoid valve, there may be a
blockage in the water line before the solenoid valve, or
thesolenoidvalvemayrequireinspectionforwearand
removal of waterborne particles.
If the sound is not heard as described, replace the
solenoid valve.
P1127.40
Removal and Replacement:
1. Remove the white and black wires from the sole-
noid valve.
FIG. 8 SOLENOID VALVE
Location:
2. Turn off the water supply to the brewer.
3. Disconnect the water lines to and from the sole-
noid valve.
The solenoid valve is located inside the trunk on
the center lower part of the component bracket.
4. Remove the two #8-32 screws securing the sole-
noid mounting bracket to the component bracket.
Remove solenoid bracket and solenoid valve as an
assembly.
5. Remove the two #10-32 screws and lockwashers
securingthesolenoidvalvetothesolenoidbracket.
6. Using two #10-32 screws and lockwashers install
new solenoidvalveonsolenoidmountingbracket.
7. Using two #8-32 screws install solenoid valve and
bracket to 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. With a voltmeter, check the voltage across the
white and black wires. Connect the brewer to the
power source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 240 volts ac for two wire 200 or 240 volt
models.
c) 100 volts ac for two wire 100 volt models.
4. Disconnect the brewer from the power source,
8. Securely fasten the water lines to and from the
solenoid valve.
9. Refer to Fig. 9 when reconnecting the wires.
WHI from Timer
BLK from Timer
If voltage is present as described, proceed to #5
If voltage is not present as described, refer to Wiring
Diagrams and check brewer wiring harness.
5. Check for continuity across the solenoid valve coil
terminals.
P1132.50
FIG. 9 SOLENOID VALVE TERMINALS
10690 062300
If continuity is present as described, reconnect the
white and black wire from the timer.
Page 19
SERVICE (cont.)
START SWITCH
If continuity is present as described, reconnect the
blue wire to the top terminal and the white/red wire 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 wire 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 Fig. 11 when reconnecting the wires.
P0150.50
FIG 10 START SWITCH
Location:
The start switch is located in the front of the
hood just to the right of center.
Test Procedure:
BLU to BLU Lead from
Timer P1
1. Disconnect the brewer from the power supply.
2. Disconnect the blue wire from the top switch
terminal and the white/red wire from the bottom
switch terminal.
WHI/RED to ON/OFF
Switch
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 ter-
minals in the upper position.
P1133
FIG. 11 START SWITCH TERMINALS
10690 062300
Page 20
SERVICE (cont.)
TANK HEATER
4. Disconnecttheblackwireandthewhitewireorred
wire from the tank heater terminals.
5. Check for continuity across the tank heater termi-
nals.
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.
P1127.40
Removal and Replacement:
FIG. 12 TANK HEATER
1. Disconnect the water supply tube from the fill
basin.
Location:
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 a faucet, shut off water supply to
the brewer and disconnect the inlet and outlet
water lines to the faucet coil assembly.
4. Disconnect the black wire on the limit thermostat
from the tank heater switch. On late model brew-
ers also disconnect the blue wire from the limit
thermostat to the control thermostat.
5. Disconnecttheblackwireandthewhiteorredwire
from the tank heater terminals.
6. Remove sprayhead and the hex nut securing the
sprayhead tube to the hood. Set aside for reas-
sembly.
7. Remove the eight #8-32 nuts securing the tank lid
to the tank.
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. With a voltmeter, check the voltage across the
black and white wires on 100 or 120 volt models
or the black and red wires for 120/240 volt mod-
els, 200 volt models and 240 volt models . Con-
nect 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)240voltsacforthreewire120/240voltmodels.
c) 200 to 240 volts ac for two wire 200 or 240 volt
models.
d) 100 volts ac for two wire 100 volt models.
3. Disconnect the brewer from the power source.
8. Remove the tank lid with limit thermostat, spray-
head tube, tank heater, coil assembly and control
thermostat w/bracket (early models only).
9 Remove the two hex nuts securing the tank heater
to the tank lid. Remove tank heater with gaskets
and discard.
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.
10690 062300
Page 21
SERVICE (cont.)
TANK HEATER (Cont.)
10. Install new tank heater with gaskets on the tank lid
and secure with two hex nuts.
WHItoTerminalBlock
(White Insert on 120V
or 100V Two Wire
Models)
REDtoTerminalBlock
(Red Insert on 120/
240VThreeWireMod-
els or 200V and 240V
Two Wire Models)
BLK to Control Thermostat
(Brewers W/Out Faucet)
BLK to Fuse (Brewers W/
Faucet)
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 thermo-
statandcontrolthermostatsectionsinthismanual
when reconnecting wires.
16. Install fill basin, secure with tank inlet fitting and
gasket. Insert water supply line through grommet
in fill basin.
17. RefertoFig. 13 whenreconnectingthetankheater
wires.
P1134.65
FIG. 13 TANK HEATER TERMINALS
10690 062300
Page 22
SERVICE (cont.)
TANK HEATER SWITCH
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 re-
moved from the limit thermostat and the black
insert on the terminal block. with the tank heater
switchinthe"ON"upperposition.Continuityshould
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 sup-
ply to the brewer.
2. On automatic brewers gently remove the fill tube
from back of fill basin.
P1127.40
FIG. 14 TANK HEATER SWITCH
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 spray-
head tube to the hood. Set aside for reassembly.
6. Disconnect the wires on the limit thermostat and
the tank heater and the control thermostat (early
models).
7. Gently pull the thermostat sensor and grommet
from the tank lid.
8. Insert a tube to the bottom of the tank and syphon
ALL of the water out.
9. Gently reinstall the thermostat sensor and grom-
met 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.
Location:
The tank heater switch is located on the rear of
the brewer on the upper left side of the trunk.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Disconnect the black wire from the limit thermo-
stat.
3. With the tank heater switch in the "ON"(upper)
position, and with a voltmeter, check the voltage
between the black wire removed from the limit
thermostat and the white wire or red wire on the
tank heater. Connect the brewer to the power
source. The indication must be:
a) 120V volts ac on two wire 120 volt models.
b) 240 volts ac on three wire 120/240 volt mod-
els.
c) 200 to 240 volts ac on 200 volt or 240 volt
models.
d) 100 volts ac for 100 volt models.
4. Disconnect the brewer from the power source.
12. Disconnect the two black wires from the tank
heater switch.
10690 062300
Page 23
SERVICE (cont.)
TANK HEATER SWITCH (cont.)
19. Secure the sprayhead tube to the hood using hex
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.
nut.
20. Install sprayhead.
21. Install fill basin, inlet gasket and secure to tank lid
with tank inlet fitting.
14. 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.
22. Carefullyinstall water fill tubeintothebackofthe
fill basin.
23. Reconnect and turn on the incoming water sup-
ply.
15. Reconnect the two black wires the tank heater
switch terminals.
24. Refer to FIG. 15 when reconnecting the wires.
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. On brewers with a faucet, reinstall the faucet tube
and reconnect the water supply tube to the coil
assembly.
BLK to Limit Thermostat
BLK to Terminal Block
(Black Insert)
P1135
FIG. 15 TANK HEATER SWITCH TERMINALS
10690 062300
Page 24
SERVICE (cont.)
TIMER(Early Models)
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. With a voltmeter, check the voltage across the
sockets P1 & P2 (blue and white wires) of the
female connector when the "ON/OFF" switch is in
the "ON" (upper) position and the "START" switch
is pressed. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 240 volts ac for two wire 200 volt or 240
volt models.
c) 100 volts ac for two wire 100 volt models.
6. Disconnect the brewer from the power source.
7. Reconnect the three pin connector from main
wiring harness to the timer.
P1127.40
FIG. 16 TIMER
Location:
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.
The timer is located inside the front of the trunk
on the top of component bracket.
Test Procedure.
7. Disconnect the black and white wires to the sole-
noid.
1. Disconnect the brewer from the power source.
2. Disconnectthepolarized,threepinconnectorfrom
the brewer wiring harness and rotate the brew
timer dial fully counterclockwise.
3. Withavoltmeter,checkthevoltageacrosssockets
P2 & P3 (white and black wires) of the female
connectorwhenthe"ON/OFF"isinthe"ON"(upper)
position. Connect the brewer to the power source.
The indication must be:
9. With a voltmeter, check the voltage across the
black and white wires when the "ON/OFF" switch is
in the "ON" (upper) position and the "START"
switch is pressed to the "START" (lower) position
and released. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for approximately 20 seconds for
two wire 120 volt models and three wire 120/240
volt models.
b) 200 to 240 volts ac for approximately 20 sec-
onds for two wire 200 volt or 240 volt models.
c) 100 volts ac for approximately 20 seconds for
two wire 100 volt models.
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 240 volts ac on two wire 200 volt or 240
volt models.
c) 100 volts ac for two wire 100 volt models.
4. Disconnect the brewer from the power source.
10690 062300
Page 25
SERVICE (cont.)
TIMER (cont.)
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. Separate all connectors between the brewer wir-
ing harness and the timer.
2. Remove the one #8-32 screw securing timer to
component bracket.
To Main Wiring Harness
WHI to Solenoid Valve
BLK to Solenoid Valve
3 Install new timer circuit board as described in Late
Model Timer section on the following pages.
4. Refer to Fig. 19 when reconnecting the wires.
5. Install the Timer Setting decal, provided with the
replacement timer kit, below the schematic on the
inside of the front access panel.
OLD STYLE
FIG. 17 TIMER TERMINALS
P1136
6. Adjust the timer as required. Refer to Late Model
Timer section on the following pages.
10690 062300
Page 26
DIGITAL BREW TIMER (Late Models)
If voltage is present as described, proceed to #6.
If voltage is not present as described, refer to the
Wiring Diagrams and check the brewer wiring har-
ness.
6. With a voltmeter, check the voltage across termi-
nals TL1 and TL4 when the "ON/OFF" switch is in
the"ON"position. Connectthebrewertothepower
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 termi-
nals TL1 and TL4 when the "ON/OFF" switch is in
the"ON"position. Connectthebrewertothepower
source and press the "START" switch. The indica-
tion must be as follows:
P1127.40
FIG. 18 DIGITAL BREW TIMER
Location:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 240 volts ac on two wire 200 volt or 240
volt models.
The timer is located inside the front of the trunk on
the top of the component bracket.
Test Procedure.
c) 100 volts ac for two wire 100 volt models.
NOTE:Donotremoveorinstallwireswhiletimerboard
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 two #8-32 screws securing circuit
board to the mounting bracket.
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.
3. Remove circuit board and spacers (as required).
4. With a voltmeter, check the voltage across termi-
nals TL1 and TL2 when the "ON/OFF" switch is in
the"ON"position. Connectthebrewertothepower
source. The indication must be:
Removal and Replacement:
1. Remove the two #8-32 screws securing circuit
board to the mounting bracket.
2. Remove circuit board and spacers (as required).
3. Remove all wires from the timer.
4. Attach all wires to the replacement timer board
prior to installation to the component mounting
bracket. Refer to FIG. 19 when reconnecting the
wires.
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 240 volts ac on two wire 200 volt or 240
volt models.
c) 100 volts ac for two wire 100 volt models.
5. Disconnect the brewer from the power source.
5. Install new circuit board with spacers (as re-
quired) to the component mounting bracket.
6. Adjust the timer as described below.
10690 062300
Page 27
SERVICE (cont.)
DIGITAL BREW TIMER (Late Models)(cont.)
View the level of the liquid being dispensed. When
the desired level is reached, turn the ON/OFF switch
to “OFF”.
NOTE: Several ounces of water will continue to sy-
phon from the tank after turning the switch “OFF”.
The brewer remembers this volume and will continue
to brew batches of this size until the volume setting
procedure is repeated.
Timer Setting:
NOTE: Prior to setting or modifying volumes, check
that the brewer is connected to water supply, the tank
is properly filled, and a funnel and server are in place.
NOTE: All volume settings must be done with the
sprayhead installed.
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.
3. Setting programming disable feature. If it be-
comes necessary to prevent anyone from changing
brew time once programmed, you can set the SET/
LOCK switch to the “LOCK” position. This will pre-
vent any further programming until switch is once
again put into the “SET” position.
To increase a brew volume, place the ON/OFF
switch in the “ON” position, press and hold the START
switch until three clicks are heard. Release the switch
and press it again one or more times. (Failure to re-
lease the switch within two seconds after the third
click causes the volume setting to be aborted and pre-
vious volume setting will remain in memory.) Each
time the switch is pressed, two seconds are added to
the brew time period. Allow the brew cycle to finish in
order to verify that the desired volume has been
achieved.
To decrease a brew volume, place the ON/OFF
switch in the “ON” position, press and release the
START switch once for every two-second interval to
be removed from the total brew time period; then im-
mediately press and hold down the START switch until
three clicks are heard. Release the switch. (Failure to
release the switch within two seconds after the third
click causes the volume setting to be aborted and pre-
vious volume setting will remain in memory). Allow
the brew cycle to finish in order to verify that the de-
sired volume has been achieved.
2. Setting brew volumes. To set a brew volume,
first check that the SET/LOCK switch is in the “SET”
position on the circuit board. Place the ON/OFF switch
in the “ON” position, press and hold the START switch
until three distinct clicks are heard and then release
the switch. (Failure to release the switch within two
seconds after the third click causes the volume set-
ting to be aborted and previous volume setting will
remain in memory.)
BLU/BLK wire from TL5 to P1
WHI/GRN wire from TL4 to (WHI) Solenoid
WHI/BLU wire from TL3 to (BLK) Solenoid
WHI wire from TL2 to P2
BLK wire from TL1 to P3
P2037
FIG. 19 DIGITAL TIMER WIRING
10690 062300
Page 28
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