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OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
27040.0000F
01/04 ©1996 Bunn-O-Matic Corporation
www.bunnomatic.com
INTRODUCTION
This equipment will brew two half-gallon, gallon, or gallon and a half batches of coffee into awaiting servers
at the push of a button. The brewer is also equipped with a hot water faucet for allied beverage use and is designed
to interface with a BUNN® Grinder. The brewer is specifically designed for use with a BUNN® 1.5 GPR server. It
is only for indoor use on a sturdy counter or shelf.
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:
1) All equipment other than as specified below: 2 years parts and 1 year labor.
2) Electronic circuit and/or control boards: parts and labor for 3 years.
3) Compressors on refrigeration equipment: 5 years parts and 1 year labor.
4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis: parts
and labor for 3 years or 30,000 pounds of coffee, whichever comes first.
These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will
be commercially free of defects in material and workmanship existing at the time of manufacture and appearing
within the applicable warranty period. This warranty does not apply to any equipment, component or part that was
not manufactured by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect, alteration, improper
installation or operation, improper maintenance or repair, damage or casualty. This warranty is conditioned on the
Buyer 1) giving BUNN prompt notice of any claim to be made under this warranty by telephone at (217) 529-6601
or by writing to Post Office Box 3227, Springfield, Illinois 62708-3227; 2) if requested by BUNN, shipping the
defective equipment prepaid to an authorized BUNN service location; and 3) receiving prior authorization from
BUNN that the defective equipment is under warranty.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR ORAL,
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.
If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its
exclusive option while the equipment is under warranty, shall either 1) provide at no charge replacement parts and/
or labor (during the applicable parts and labor warranty periods specified above) to repair the defective
components, provided that this repair is done by a BUNN Authorized Service Representative; or 2) shall replace
the equipment or refund the purchase price for the equipment.
THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF
THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AT BUNN’S
SOLE OPTION AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND.
In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost profits, lost sales,
loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute
equipment, facilities or services, or any other special, incidental or consequential damages.
27040 010804
Page 2
USER NOTICES
The notices on this brewer should be kept in good condition. Replace unreadable or damaged labels.
00658.0000
00831.0000
20201.5600
00656.0000
12364.0000
ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up.
L2 RED
L2 RED
120V A.C.
200 or 240V A.C.
WHITE
208 or 240V A.C.
NEUTRAL
120V A.C.
L1 BLACK
L1 BLACK
Requires 2-wire, grounded
service rated 200 to 240
volts ac, 30 amp, single
phase 50 or 60 Hz.
Requires 3-wire, grounded
service rated 120/208 or 120/
240 volts ac, 30 amp, single
phase, 60 Hz.
27040 010804
Page 3
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. Remove the front panel beneath the sprayheads.
Models with electronic control assemblies:
Place the tank heater switch at the top of the control assembly in the “OFF” position.
Models with electro/mechanical thermostats:
Rotate the control thermostat knob fully counterclockwise to the “OFF” position.
4. Feed the cord through the strain relief and connect it to the terminal block.
5. Connect the brewer to the power source and verify the voltage at the terminal block before proceeding. Replace
the front panel.
6. 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
This brewer must be connected to a cold water system with operating pressure between 20 and 90 psi (138
and 620 kPa) 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 (620 kPa) to reduce it to 50 psi (345 kPa). 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).
PLUMBING HOOK-UP
1. Flush the water line and securely attach it to the flare fitting on the strainer/flow control located on bottom of
brewer.
2. Turn on the water supply.
INITIAL SET-UP
CAUTION – The brewer must be disconnected from the power source throughout the initial set-up, except when
specified in the instructions.
NOTE: ECA Models Only -This brewer is equipped with a temperature sensor that indicates when to brew and, when
selected, locks-out the start of a brew cycle until the water has heated to the optimum brewing temperature.
1. Remove the front panel beneath the sprayhead.
Models with electronic control assemblies:
Place the tank heater switch at the top of the control assembly in the “OFF” position.
Replace the front panel.
Models with electro/mechanical thermostats:
Rotate the control thermostat knob fully counterclockwise to the “OFF” position.
Replace the front panel.
2. Connect the brewer to the power source. Water will begin flowing into the tank.
3. When water stops flowing into the tank, remove the front panel and proceed as directed:
27040 032201
Page 4
INITIAL SET-UP (cont.)
REFERENCE CHART
MECHANICAL BYPASS WITH ADJUSTABLE NEEDLE VALVE
BYPASS PERCENTAGE VS NUMBER OF FULL TURNS FROM
MAXIMUM CLOCKWISE POSITION
SINGLE & DUAL BREWERS
40
30
% BYPASS
4.
5.
6.
7.
Models with electronic control assemblies:
Place the tank heater switch at the top of the control assembly in the “ON” position and replace the front panel.
Models with electro/mechanical thermostats:
Rotate the control thermostat knob fully clockwise to the “ON” position and replace the front panel.
Wait approximately twenty minutes for the water in the tank to heat to the proper temperature.
Place an empty server beneath either brew station and the ON/OFF switch in the upper ("ON") position.
Triple-set Timers only: Place the brew station Selector switch in the 11⁄2 gallon position.
(A) Initiate a brew cycle; after water has stopped flowing from the funnel, place the ON/OFF switch in the lower
("OFF") position and check the water volume in the server. It should be 192 ounces (5.7 L) for 1 1/2 gallons.
If not, adjust the timer as required. Refer to Adjusting Brew Volumes
NOTE: Each batch setting must be adjusted individually, if they are not correct. Volumes are as follows:
1 gallon - 128 ounces (3.8L)
.5 gallon - 64 ounces (1.9L)
(B) If necessary adjust the needle valve to achieve desired water volume to be bypassed around the coffee filter
in the funnel.
NOTE: To increase the water bypass turn the needle valve counterclockwise, to decrease the water bypass turn
the needle valve clockwise. An adjustment of the needle valve will require a timer adjustment for volume. To
determine how many turns must be performed to achieve the desired volume, use the chart below.
20
10
0
0
1
2
3
4
5
NUMBER OF FULL TURNS
6
7
8
NOTE: The factory bypass is set at 20%
27040 011904
Page 5
INITIAL SET-UP (cont.)
8. Repeat step 7 until the proper water volume is achieved.
9. Repeat steps 5 through 8 for the remaining brew station.
10. The brewer is now ready for use in accordance with the coffee brewing instructions.
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 remembers 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 programming to be done until switch is once again placed in the “SET” position.
OPERATING CONTROLS
BREW SELECTOR SWITCH (Triple - set timer models only)
Placing the switch in the 1⁄2 Gal, 1 Gal, or 11⁄2 Gal position selects the amount of coffee to be brewed in
subsequent brew cycles. Repositioning this switch after a brew cycle has been initiated does not change the brew
batch in progress.
ON/OFF SWITCH
Placing the switch in the unlighted lower position cuts power to the brew station warmer and stops brewing.
Stopping a brew cycle after it has been started will not stop the flow of water from the funnel. Placing the switch
in the lighted upper position supplies power to the brew station warmer and enables the brew circuit.
START SWITCH
Momentarily pressing and releasing this switch starts a brew cycle when the On/Off switch is in the lighted
upper position.
GRINDER SELECTOR SWITCH
Pressing the right or left side of the switch selects the corresponding brew station.
NOTE – The On/Off switch must be in the lighted upper position to initiate and complete a brew cycle.
27040 011904
Page 6
INITIAL SET-UP (cont.)
COFFEE BREWING
1.
2.
3.
4.
5.
6
7.
Select the desired batch size.
Insert a BUNN® filter into the funnel.
Pour the proper amount of fresh ground coffee into the filter and level the bed of grounds by gently shaking.
Slide the funnel into the funnel rails.
Place an empty server under the funnel.
Place the On/Off switch in the lighted upper position. Momentarily press and release the start switch.
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.
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.
27040 011904
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.
•
•
•
•
•
•
•
WARNING
•
•
•
•
Inspection, testing, and repair of electrical equipment should be performed only by qualified
service personnel.
All electronic components have 120 - 240 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 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.
Exercise extreme caution when servicing electrical equipment.
Disconnect the brewer from the power source when servicing, except when electrical tests are
specified.
Follow recommended service procedures.
Replace all protective shields or safety notices.
Problem
Probable Cause
Remedy
Equipment will not operate.
1. No power or incorrect voltage.
(A1) Check the terminal block for
120 volts across the red and white
terminals and the black and white
terminals on 120/208 or 120/240
volt brewers.
(A2) Check the terminal block for
200 volts on "B Series" brewers or
240 volts on "A Series" brewers
across the red and black terminals.
(B) Check circuit breakers or fuses.
Brew cycle will not start.
1. No water
Check plumbing and shut-off valves
2. Water strainer/flow control
(.750 GPM)
(A) Direction of flow arrow must be
pointing towards brewer.
(B) Remove the strainer/flow control and check for obstructions. Clear
or replace.
27040 041100
Page 8
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Brew cycle will not start (cont.)
3. ON/OFF switch
Refer to Service - ON/OFF switch for
testing procedures. See page 32
4. Start switch
Refer to Service - Start switch for
testing procedures. See page 37
5. Timer
Refer to Service - Timer for testing
procedures. See page 39 or 42
6. Dispense Valve
Refer to Service - Dispense valve for
testing procedures. See page 22
7. Control Assembly (Electronic)
Refer to Service - Control assembly
for testing procedures. See pages
23 thru 28
1. No water
Check plumbing and shut-off valves.
2. Water strainer/flow control
(.750 GPM)
(A) Direction of flow arrow must be
pointing towards brewer.
Automatic refill will not operate
(B) Remove the strainer/flow control and check for obstructions. Clear
or replace.
3. Solenoid Valve
Refer to Service - Solenoid valve for
testing procedures. See page 36
4. Limit thermostat (Electro/
mechanical and Electronic)
Refer to Service - Limit thermostat
for testing procedures. See page 31
5. Overflow protection switch
Refer to Service - Overflow protection switch for testing procedures.
See page 33
6. (A) Level control board & level
probe. (Electro/mechanical controlled)
Refer to Service - Level control board
for testing procedures. See page 29
(B) Electronic controls
Refer to Service - Electronic controls for testing procedures. See page
23 thru 28
27040 011904
Page 9
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Beverage level will not adjust
(Selector switch in any position)
1. Brew Selector switch
Refer to Service - Selector switch for
testing procedures. See page 16
Water flows into tank continuously
.
1. Solenoid valve
Refer to Service - Solenoid valve for
testing procedures. See page 36
2A. Level control board and level
probe (Electro/mechanical)
Refer to Service - Level control board
for test procedures. See page 29
2B. Control assembly (Electronic)
Refer to Service - Control assembly
for testing procedures. See page 23
thru 28
1. Timer
Refer to Service - Timer for testing
procedures. See page 39 or 42
2. Overflow protection switch
Refer to Service - Overflow protection switch for testing procedures.
See page 33
1. Limit thermostat
Refer to Service -Limit thermostat
for testing procedures. See page 31
Water flows into tank continuously
(ON/OFF switch "ON").
Water from tank is not hot
CAUTION - Do not eliminate or bypass limit thermostat. Use only replacement part #23717.0001
2A. Control Thermostat (Electro/mechanical)
Refer to Service - Control Thermostat for testing procedures. See page
20
2B. Control assembly (Electronic)
Refer to Service - Control assembly
for testing procedure. See page 23
thru 28
3. Contactor (Brewers with Recovery Booster)
Refer to Service - Contactor for testing procedures. See page 18
4. Tank heaters
Refer to Service - Tank heaters for
testing procedures. See page 38
5. Triac assembly (Electronic)
Refer to Service - Triac assembly for
testing procedures. See page 23 thru
28
27040 011904
Page 10
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Water from tank is not hot (cont.).
6. Relay (Brewers with Recovery
Booster)
Refer to Service - Relay for testing
procedures. See page 34
Server warmer is not hot.
1. ON/OFF switch
Refer to Service - ON/OFF switch for
testing procedures. See page 32
2. Warmer element
Spitting or unusual steaming from
sprayhead or airvents.
Refer to Service - Warmer element
for testing procedures. See page 44
1A. Control thermostat (Electro/mechanical)
Refer to Service - Control thermostat for testing procedures. See page
20
1B. Control assembly (Electronic)
Refer to Service - Control assembly
for testing procedures. See page 23
thru 28
2. Triac assembly (Electronic)
Refer to Service - Triac assembly for
testing procedures. See page 23 thru
28
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.
Inconsistent beverage level in server.
Inspect the tank assembly for excessive lime deposits. Delime as required.
1. Strainer/flow control (.750 GPM)
(A) Direction of flow arrow must be
pointing towards the brewer.
(B) Remove the strainer/flow control and check for obstructions. Clear
or replace.
2. Improper water pressure
Check operating water pressure to
the brewer. It must be between 20
and 90 psi (138 and 620 kPa) .
27040 011904
Page 11
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Inconsistent beverage level in
server (cont.).
3. Dispense valve
Refer to Service - Dispense valve for
testing procedures. See page 22
Consistently high or low beverage
level in server.
1. Timer adjustment
Adjust the timer as required to
achieve the recommended volume
for each brew cycle.
Dripping from sprayhead.
1. Dispense valve
Refer to Service - Dispense valve
for testing procedures. See page 22
Water overflows filter.
1. Bypass valve
Refer to Initial Set-Up on page 5 step
#7. For test procedures see page 15
2. Needle Valve
Refer to Initial Set-Up on Page 5
step #7
3. Type of paper filters
BUNN® paper filters should be used
for proper extraction.
4. No sprayhead
Check sprayhead
1. Beverage left in server
The brew cycle should be started
only with an empty server under the
funnel.
2. Timer adjustment
Adjust the timer as required to
achieve the recommended volume
for each brew cycle.
Refer to Service - Timer for testing
procedures. See page 39 or 42
3. Dispense valve
Refer to Service - Dispense valve for
testing procedures. See page 22
1. Type of paper filters
BUNN® paper filters should be used
for proper extraction.
2. Coffee
A sufficient quantity of fresh drip or
regular grind should be used for
proper extraction.
Beverage overflows server.
Weak beverage.
27040 011904
Page 12
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Weak beverage (cont.)
3. Sprayhead
A clean sprayhead should be used to
properly wet the bed of ground coffee in the funnel.
4. Funnel loading
The BUNN® paper filter should be
centered in the funnel and the bed of
ground coffee leveled by gentle shaking.
5. Water temperature
Empty the server, remove its cover,
and place the server on the warmer.
Place empty funnel over the server
entrance, with ON/OFF switch in the
"ON" position press the start switch
and release it. Check the water temperature immediately below the
sprayhead with a thermometer. The
reading should not be less than
195˚F(91˚C).
1. Solenoid (Inlet)
The nut on back of the solenoid
must be tight or it will vibrate during
operation
2. Plumbing lines
Plumbing lines should not be resting on the counter top.
3. Water supply
(A) The brewer must be connected
to a cold water line.
Brewer is making unusual noises.
(B) Water pressure to the brewer
must not be higher than 90 psi (620
kPa). Install a regulator if necessary
to lower the working pressure to
approximately 50 psi (345 kPa).
4. Tank Heaters
Remove and clean lime off tank heaters.
5. Contactor
Check for low voltage
27040 011904
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 for assistance in determining the
cause of any problem.
The top cover is attached with four #4-40 slotted
head screws.
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.
The warmer base is attached with four #6-32
slotted head screws.
The front inspection panel is attached with five #632 slotted head screws.
Contents
COMPONENT ACCESS
WARNING - Unplug the brewer before the removal of
any panel or the replacement of any component.
All components are accessible by the removal of
the top cover, front inspection panel and warmer base
plate.
1 1⁄2
gal
1 gal
1⁄2
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Brewer Selector Switch......................................... 16
Bypass Valve ........................................................ 15
Contactor Assembly.............................................. 18
Control Thermostat ............................................... 20
Dispense Valve ..................................................... 22
Electronic Control .................................... 23 thru 28
Grinder Selector Switch ........................................ 28
Level Control Board and Level Probe .................... 29
Limit Thermostat .................................................. 31
ON/OFF Switch (Warmer) ..................................... 32
Overflow Protection Switch .................................. 33
Relay .................................................................... 34
Solenoid ............................................................... 36
Start Switches (Brew) ........................................... 37
Tank Heaters ......................................................... 38
Timers (Early Models) .......................................... 39
Digital Timer (Late Models) .................................. 42
Warmer Elements ................................................. 44
Wiring Diagrams ................................................... 45
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27040 011904
Page 14
SERVICE (cont.)
6. Connect the voltmeter lead ends to the bypass
valve coil terminals. Connect the brewer to the
power source. With the selector switch in the 1 or
1-1/2 gallon position, place "ON/OFF" Switch in the
"ON" position. Press and release the brew switch.
The indication must be:
a.) 120 volts ac for three wire 120/208 volt and
three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
BYPASS VALVE
1 gal
S
.
TE IC
NU AT C
MI -O-M 0 VA
NN - 12
BU 20
26
P/N
7. Disconnect the brewer from the power source.
S
TE IC
NU AT C
MI -O-M 0 VA
NN - 12
BU 20
26
P/N
.
N
:
W
A
R
M
E
R
S
A
N
D
S
U
R
F
A
C
E
S
A
R
E
H
O
T
If voltage is present as described, but no coil action is
observed, nor "clicking" heard, bypass valve is defective. Replace valve and test again to verify repair.
If voltage is not present as described, refer to Wiring
Diagrams and check the brewer wiring harness. Also
check the control board for proper operation. See
Pages 22 through 27.
T WA
TER
C
A
U
T
IO
HO
!
CA
UT
ION
P773
FIG. 1 BYPASS VALVES
Location:
The bypass valves are located inside the right front
and the center front of the hood.
Test Procedures:
1. Disconnect the brewer from the power source and
place a server beneath the funnel.
2. Check the water level in the tank to confirm that it
is within 1/2" from the top of the tank.
3. Connect the brewer to the power source.
4. Check the bypass valve for coil action. Place the
ON/OFF switch in the "ON" position, press and
release the BREW switch. Listen carefully in the
vicinity of the bypass valve for a "clicking" sound as
the coil magnet attracts and repels the plunger.
5. Disconnect the brewer from the power source.
Removal and Replacement:
1. Remove the wires from the bypass valve.
2. Drain enough water from the tank so bypass valve
is above the water line.
3. Remove water lines from bypass valve.
4. Remove the two nuts retaining the bypass valve
inside the hood and remove bypass valve.
5. Remove hose barb fitting and attach to new bypass valve.
6. Install new bypass valve with hose barb fitting.
7. Reconnect the water tubes and the wires to the
bypass valve.
8. Refer to Fig. 2 when reconnecting the wires.
If the sound is heard as described, there may be a
blockage in the bypass valve or the water line to the
sprayhead. Remove the bypass valve and inspect for
wear, and remove waterborne particles.
If the sound is not heard as described, proceed to #6.
WHI/GRN To Dispense Valve
WHI/VIO to Brew Selector
Switch
LEFT AND RIGHT VALVE
P774
FIG. 2 BYPASS VALVE TERMINALS
27040 032201
Page 15
SERVICE (cont.)
12. Reconnect the pink wire to the grind switch.
13. Disconnect the tan wire from the left or right
selector switch and tan wire from interface socket.
14. Check for continuity across the tan wires.
15. Reconnect the tan wires.
16. With the selector switch set at 1 and 1-1/2 gallon,
disconnect the white/violet from the bypass valve.
17. Check for continuity across the white/violet wire
and terminal on bypass valve.
18. Reconnect the white/violet wire to the terminal on
the bypass valve.
19. Disconnect the white/red wire from the dispense
valve.
20. Check for continuity across white/red wire and
terminal on dispense valve.
21. Reconnect white/red wire to the terminal on the
dispense valve.
BREW SELECTOR SWITCH
1 1⁄2
gal
1 gal
1⁄2
gal
RE
CT
LE
SE
ON
ST
1 1⁄2
AR
AR
/W
AD
Y
OR
R
ME
T
gal
1 gal
1⁄2
gal
ST
ON
SE
AD
RE
LE
AR
/W
ME
AR
T
R
OR
CT
Y
FIG. 3 BREW SELECTOR SWITCHES
P775
Location:
The brew selector switches are located in the front
left and right side of the hood.
Test Procedure:
1. Disconnect the brewer from the power supply.
2. Separate the connector on the selector switch
harness from the brew timer circuit board.
3. Carefully slide the plastic cover off of the connector from the switch harness.
4. Check for continuity across the pink and tan wires
on the connector when the switch is in the 1/2
gallon position. Continuity must not be present in
any other switch position.
5. Check for continuity across the pink wire and gray
wire when the switch is in the 1 gallon position.
Continuity must not be present in any other position.
6. Reattach the connector to the brew timer circuit
board.
7. Disconnect the gray wire from the left or right
selector switch and gray wire from the interface
socket.
8. Check for continuity across the gray wires.
9. Reconnect the gray wires from the selector switches
and the interface socket.
10. Disconnect the pink wire from the left or right
selector switch to the grinder switch.
11. Check for continuity across the pink wire and the
terminal on the grind switch.
If continuity is present as described the switch is
operating properly.
If continuity is not present as described replace switch
assembly.
Removal and Replacement:
1. Disconnect the connector on the selector switch
harness from the brewer timer circuit board.
2. Disconnect wires from the selector switch, interface socket, dispense valve and bypass valve.
3. Loosen the set screw on the switch knob.
4. Remove the 9/16" nut and washer holding the
switch to the hood.
5. Remove the switch.
6. Install the new switch. The positioning tab must be
in the hole in the hood for proper switch and knob
alignment.
7. Install the knob so that the arrow lines up in the 11/2 gallon position when the switch is turned to the
full right position.
8. Reattach the connector to the brew timer circuit
board.
9. Refer to Fig. 4 when reconnecting the wires.
27040 032201
Page 16
SERVICE (cont.)
WHI/VIO to Left or Right By-Pass Valve
To Left or Right Timer
WHI/RED to Left or Right Dispense Valve
TAN
GRY to Left or Right Selector Switch
to GRY Lead on Interface Socket
GRY
PNK
PNK from Left Switch to Grinder
Switch (Lower Left)
PNK from Right Switch to Grinder
Switch (Lower Right)
TAN to Left or Right Selector Switch to
TAN Lead on Interface Socket
FIG. 4 BREW SELECTOR SWITCH TERMINALS
P776
27040 032201
Page 17
SERVICE (cont.)
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
5. Disconnect the brewer from the power source.
CONTACTOR ASSEMBLY
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 harness.
1 1⁄2
gal
1 gal
1⁄2
gal
RE
AD
Y
OR
CT
LE
6. Check for continuity between the two black wires
of the contactor coil.
SE
RM
ON
ER
/ WA
T
AR
ST
1 1⁄2
gal
1 gal
S
TE IC
NU AT C
MI -O-M 0 VA
NN 12
BU 2026
.
1⁄2
gal
T
AR
ST
P/N
ON
RM
/ WA
ER
OR
S
.
TE IC
NU AT C
MI -O-M 0 VA
NN 12
BU 2026
CT
LE
SE
Y
AD
RE
If continuity is present as described, reconnect one
black wire to red or white wire from the terminal block
and the other black wire to the black wire from the
control thermostat. Reinstall capillary tube into the
tank to a line 7" above the bulb and proceed to #7.
If continuity is not present as described, replace the
contactor.
N
:
W
A
R
M
E
R
S
A
N
D
S
U
R
F
A
C
E
S
A
R
E
H
O
T
P/N
T WA
TER
C
A
U
T
IO
HO
!
CA
UT
ION
P796
FIG. 5 CONTACTOR ASSEMBLY
Location:
The contactor assembly is located inside the hood
just to the rear of the right dispense valve.
Test Procedures:
Mechanical Thermostat (Brewers with or without
Recovery Booster)
1. Disconnect the brewer from the power source.
2. Disconnect the red wire of the two pole 200V or
240V terminal block or the white wire of the three
pole 120/208V or 120/240V terminal block and the
black wire of the contactor coil. Disconnect the
black wire of the control thermostat from the
remaining black wire of the contactor coil.
3. Gently remove the capillary bulb and grommet
from the tank.
4. With a voltmeter, check the voltage across the
white wire from the terminal block on 120/208,
120/240 volt units or the red wire from 200 or 240
volt units and the black wire from the control
thermostat when the thermostat is turned clockwise to the "FULL ON" position. Connect the brewer
to the power source. The indication must be:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models.
7. Locate the red wire on the L1 terminal and black
wire on the L2 terminal on the contactor.
8. With a voltmeter, carefully check the voltage across
the red and black wires. The indication must be:
a.) 208 volts ac for three wire 120/208 volt models
and 240 volts ac for three wire 120/240 volt
models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
9. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #10.
If voltage is not present as described, refer to the
Wiring Diagrams and check brewer wiring harness.
10. Check for continuity across the terminals on the
left side of the contactor by manually closing the
contacts. Continuity must not be present when the
contact is released.
11. Check for continuity across the terminals on the
right side of the contactor by manually closing the
contacts. Continuity must not be present when the
contact is released.
If continuity is present as described, the contactor is
operating properly.
If continuity is not present as described, replace the
contactor.
27040 032201
Page 18
SERVICE (cont.)
CONTACTOR ASSEMBLY (cont.)
Test Procedures :
Electronic Control (Brewers w/Recovery Booster)
1. Disconnect the brewer from the power source.
2. Disconnect the gray wire from the black wire on
the rear of the contactor coil and white /brown wire
from the black wire on the front of the contactor
coil.
3. With a voltmeter, check the voltage across the gray
wire and white/brown wire with both "ON/OFF"
switches in the "ON" position. Connect the brewer
to the power source and press both start switches.
The indication must be:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
4. Disconnect the brewer from the power source.
RED L1 to Terminal Block
(Red Insert)
BLK L2 to Terminal Block
(Black Insert)
BLK to WHI Lead from the
Three Pole 120/208V or
120/240V Terminal Block
BLK to RED Lead from the
Two Pole 200V or 240V
Terminal Block
BLK T2 to Left Tank Heater
BLK T2 to Right Tank Heater
RED T1 to Left Tank Heater
RED T1 to Right Tank Heater
BLK to BLK Lead from Thermostat
MECHANICAL THERMOSTAT W/RECOVERY BOOSTER
RED T1 to Terminal Block (Red
Insert)
BLU L1 to Left Tank
Heater
BLK to GRY on Relay
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the
Wiring Diagrams and check brewer wiring harness.
BLK to WHI/BRN to Left
Dispense Valve
ELECTRONIC CONTROL W/RECOVERY BOOSTER
FIG. 6 CONTACTOR TERMINALS
P778
5. Disconnect the blue and red wires from the
contactor terminals. Check for continuity across
the terminals of the contactor by manually closing
the contacts. Continuity must not be present when
the contact is released.
If continuity is present as described, reconnect the
blue and red wires to the contactor terminals. Connect
one black lead from the contactor coil to the gray wire
and the white/brown wire to the remaining black lead
of the contactor coil. The contactor is operating properly.
If continuity is not present as described, replace the
contactor.
Removal and Replacement:
1. Remove all wires from the contactor.
2. Remove the two #10-32 slotted head screw securing contactor to the inside of the hood.
3. Securely install the new contactor inside the hood.
4. Refer to Fig. 6 when reconnecting the wires.
27040 032201
Page 19
SERVICE (cont.)
CONTROL THERMOSTAT
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
4. Disconnect the brewer from the power source.
1 1⁄2
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the
Wiring Diagrams and check brewer wiring harness.
gal
1 gal
1⁄2
gal
Y
AD
RE
OR
CT
SE
ON
AR
ST
1 1⁄2
/ WA
RM
LE
ER
T
gal
1 gal
S
TE IC
NU AT C
MI -O-M 0 VA
NN - 12
BU 20
26
P/N
.
1⁄2
gal
AR
ST
T
ER
RM
ON
/ WA
OR
CT
S
.
TE IC
NU AT C
MI -O-M 0 VA
NN - 12
BU 20
26
P/N
LE
SE
Y
AD
R
M
E
R
S
A
N
D
S
U
R
F
A
C
E
S
A
R
E
H
O
T
RE
IO
N
:
W
A
TER
T WA
HO
T
U
A
C
!
ION
UT
CA
P779
FIG. 7 CONTROL THERMOSTAT
Location:
The control thermostat is located inside the lower
left front of the brewer on the component bracket.
1. Disconnect the brewer from the power source.
2. Locate the blue wire on the control thermostat.
3. With a voltmeter, check the voltage across the blue
wire on the control thermostat and the white insert
on three pole 120/208V, 120/240V terminal block
and the red insert on two pole 200V, 240V terminal
block. Connect the brewer to the power source.
The indication must be:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models.
5. Locate the black wires from the control thermostat.
6. Gently remove the capillary bulb and grommet
from the tank.
7. With a voltmeter, check the voltage across the
black wires of the control thermostat and the white
insert on the three pole 120/208V, 120/240V
terminal blocks and the red insert on two pole
200V, 240V terminal blocks 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 three wire 120/208 volt models and three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
Voltage must not be indicated across these terminals when the thermostat is turned "OFF" (fully
counterclockwise).
8. Disconnect the brewer from the power source.
If voltage is present as described, reinstall the capillary
tube into the tank to the line 7" above the bulb, the
control thermostat is operating properly.
If voltage is not present as described, replace the
thermostat.
27040 032201
Page 20
SERVICE (cont.)
CONTROL THERMOSTAT (cont.)
Removal and Replacement:
1. Remove wires from the control thermostat.
2. Remove the thermostat capillary bulb by firmly
pulling up on the capillary tube at the tank lid. This
will disengage the grommet from the tank lid.
3. Remove the #8-32 slotted head screw holding the
control thermostat to the component bracket.
4. Slide the grommet to the line 7" 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.
BLU to Left & Right Ready Lights
BLU to RED Lead from Liquid Level Switch
BLK to BLK Lead of Contactor Coil
BLK to Left & Right Ready Lights
FIG. 8 CONTROL THERMOSTAT
TERMINALS
P780
NOTE - The capillary tube must be clear of any electrical termination and not kinked.
7. Using a #8-32 slotted head screw fasten the control thermostat to the component bracket.
8. Refer to Fig. 8 when reconnecting the wires.
9. Adjust the control thermostat as required.
27040 032201
Page 21
SERVICE (cont.)
6. Check for continuity across the dispense valve coil
terminals.
DISPENSE VALVE
If continuity is present as described, reconnect the
wires to the dispense valve and proceed to #7
If continuity is not present as described, replace the
dispense valve.
1 1⁄2
gal
1 gal
1⁄2
gal
7. Check the dispense valve for coil action. Connect
the brewer to power source. Place the ON/OFF"
switch in the "ON" position, press and release the
start switch. Listen carefully in the vicinity of the
dispense valve for a "clicking" sound as the coil
magnet attracts and repels the plunger.
8. Disconnect the brewer from the power source.
Y
AD
RE
SE
ON
/ WA
RM
LE
OR
CT
ER
T
AR
ST
1 1⁄2
gal
1 gal
S
.
TE IC
NU AT C
MI -O-M 0 VA
NN - 12
BU 20
26
P/N
1⁄2
gal
T
AR
ST
ON
S
TE IC
NU AT C
MI -O-M 0 VA
NN - 12
BU 20
26
P/N
.
LE
SE
RE
/ WA
ER
RM
OR
CT
Y
AD
FIG. 9 DISPENSE VALVE
P796
Location:
Dispense valves are located inside the hood in the
center of each sprayhead panel.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the wires from the right dispense valve
and check the voltage across the white/violet wire
and white/green wire. Connect brewer to the power
source. Place the "ON/OFF" switch in the "ON"
position, press and release the start switch. The
indication must be:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
3. Disconnect brewer from the power source.
4. Disconnect the wires from the left dispense valve
and check voltage across the white/red wire and
the white/brown wire. Connect the brewer to the
power source. Place the "ON/OFF" switch in the
"ON" position and press and release the start
switch. The indication must be:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
5. Disconnect brewer from power source.
If the sound is heard as described, there may be a
blockage in the dispense valve or the water line to the
dispense valve. Remove the dispense valve and inspect for wear, and remove waterborne particles.
If the sound is not heard as described, replace the
dispense valve.
Removal and Replacement:
1. Disconnect wires and water tubes from dispense
valve.
2. Drain enough water from the tank so the dispense
valves are above the water line.
3. Remove dispense valve from the sprayhead panel.
4. Install new dispense valve.
5. Reconnect the water lines and the wires to the
dispense valve.
6. Refer to Fig. 10 when reconnecting wires.
If voltage is present as described in steps 2 & 4
proceed to #6.
If voltage is not present as described, refer to the
Wiring Diagrams and check brewer wiring harness.
WHI/VIO to Right Timer TL1
WHI/VIO to Right ON/OFF Switch
WHI/RED to Right Brew Selector Switch
WHI/GRN to Right Timer TL4
WHI/GRN to Right By-Pass Valve
RIGHT
WHI/RED to Left Timer TL1
WHI/RED to Left Brew Selector Switch
WHI/RED to Left ON/OFF Switch
WHI/BRN to Left Timer TL4
WHI/GRN to Left By-Pass Valve
P782
LEFT
FIG. 10 DISPENSE VALVE TERMINALS
27040 032201
Page 22
SERVICE (cont.)
7
ELECTRONIC CONTROL ASSEMBLY
8 6
11 10
5
9
Location:
The electronic control assembly (1) is located
inside the lower left front on the component bracket of
the brewer. Access will also be needed to the temperature sensor (8), liquid level probe (7) located on the
tank lid and to the triac assembly (17) located beneath
the tank.
12
5
1 1⁄2
gal
1 gal
1⁄2
4
gal
Y
AD
RE
OR
CT
LE
SE
ON
/
R
ME
WAR
T
AR
ST
1 1⁄2
gal
1 gal
S
.
TE IC
NU AT C
MI -O-M 0 VA
NN 12
BU 2026
1⁄2
gal
T
AR
ST
P/N
R
ME
AR
/W
13
Y
AD
RE
O
D
A
E
R
P IC
O T
T O
S N
E
P/
F
OF
N
h
!
N itc
IO ateFar Swucet!
ed
UTe Tank He
en
CA
Th m Op
On Fro
rn
T Tu me
NO ter Co
DO til Wa
3
s
Un
Fa
ilu
re
To
Co
mp
ly
Vo
ids
Wa
rra
nty
!
14
NG
AR
NI
W
S
OU
RD E
ZA AG
HA LT
VO
OM
T FR
EC CE
NN UR G!
CO R SO VIN
DIS WE REMO
PO RE
FO
BE
N
:
W
A
R
M
E
R
S
A
N
D
S
U
R
F
A
C
E
S
A
R
E
H
O
T
General:
This system controls the liquid level and water
temperature of the brewer. These two functions act
independently of each other and should be tested
separately.
ON
OR
CT
LE
SE
S
TE IC
NU AT C
MI -O-M 0 VA
NN 12
BU 20N 26
.
T WA
TE
R
C
A
U
T
IO
HO
!
CA
UT
ION
16
2
15
1
17
P783
FIG. 11 ELECTRONIC CONTROL ASSEMBLY
1.
2.
3.
4.
5.
6.
7.
8.
9.
Electronic Control
Terminal Block
Timers
Liquid Level Switch
& Overflow Cup
Tank Heater
Limit Thermostat
Liquid Level Probe
Temperature Sensor
Dispense Valve
10. Recovery Booster
Relay
11. Contactor Assembly
12. Bypass Valve
13. Ready Light
14. Solenoid Valve
15. LED
16. Temperature adjustment
17. Triac Assy
27040 032201
Page 23
PROBLEM:
LIQUID LEVEL CONTROL OVERFLOWS
SERVICE (cont.)
ELECTRONIC CONTROL ASSEMBLY (cont.)
DRAIN CUP
(4)
BREW START- LOCK
The water must be heated to the preset temperature indicated by the glowing ready light before a brew
cycle can be initiated.
RETRY
OVERFLOW
?
If the ready light goes out during a brew cycle, the
cycle will continue until it is completed. You must wait
until the ready light glows before starting another brew
cycle.
YES
DRAIN CUP (4)
DISCONNECT PROBE
WIRE FROM PROBE (7)
SHORT PROBE WIRE
TO CHASSIS
RETRY
PROBLEM:
LIQUID LEVEL CONTROL SYSTEM DOES NOT REFILL
OVERFLOW
?
REMOVE POWER
OVERFLOW CUP FULL
(4)
YES
NO
REPLACE PROBE (7)
DRAIN CUP (4)
RETRY
YES
DRAIN CUP (4)
NO
DISCONNECT WIRE
FROM
SOLENOID VALVE (14)
DISCONNECT LEVEL PROBE
(7)
VOLTAGE PRESENT AT
SOLENOID VALVE
(14)
RETRY
YES
OVERFLOW
?
DOES WATER FLOW
YES
REPLACE SOLENOID
VALVE (14)
YES
NO
NO
NO
REPLACE
CONTROL
ASSEMBLY (1)
REPLACE PROBE
(7)
REPLACE
CONTROL
ASSEMBLY (1)
P809
REPLACE
SOLENOID VALVE
(14)
P808
Liquid Level Control Test Procedure:
1. Disconnect brewer from the power source.
2. With a voltmeter, check the voltage across terminals 3 & 4 of the electronic control assembly (1).
Connect brewer to power source. The indication
must be:
a.) 208 volts ac for three wire 120/208 volt models
and 240 volts ac for three wire 120/240 volt
models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
27040 041100
Page 24
SERVICE (cont.)
ELECTRONIC CONTROL ASSEMBLY (cont.)
3. Disconnect brewer from the power source.
If voltage was present as described, proceed to #4.
If voltage was not present as described, refer to the
Wiring Diagrams and check brewer wiring harness.
4. Remove the pink wire from terminal 5 of the
electronic control assembly (1).
5. With a voltmeter, check the voltage across terminals 1 & 4 of the electronic control assembly (1).
Connect brewer to the power source. The indication must be:
a.) 208 volts ac for three wire 120/208 volt models
and 240 volts ac for three wire 120/240 volt
models after a delay of approximately 1 second.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models after a delay of approximately 1 second.
6. Disconnect the brewer from the power source.
11. Move the probe away from the brewer housing.
The indication must again be:
a.) 208 volts ac for three wire 120/208 volt models
and 240 volts ac for three wire120/240 volt
models after a delay of approximately 1 second.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models after a delay of approximately 1 second.
12. Disconnect the brewer from the power source.
If voltage was present as described, reinstall the
probe, the sensing function of the system is operating
properly.
If voltage was not present as described, check the pink
probe wire and the green ground wire for continuity
and/or replace the probe.
Temperature Control Flow Charts
If voltage was present as described, the liquid level
control system is operating properly, proceed to #7.
If voltage was not present as described, replace the
electronic control assembly (1) and temperature sensor (8) in the tank lid.
PROBLEM:
WATER NOT HOT ENOUGH
LED ON CONSTANTLY
NO
YES
MEASURE VOLTAGE
LED ON
?
AT TANK HEATER (5)
NOTE - each electronic control assembly is calibrated
to a temperature sensor. Both components MUST be
replaced as a set.
7. Reconnect the pink wire to terminal 5 of the
electronic control assembly (1).
8. Remove the liquid level probe (7) from the tank lid,
and inspect it for mineral deposits. Replace it if
necessary. Keep the exposed ends of the probe
away from any metal surface of the brewer.
9. With a voltmeter, check the voltage across terminals 1 & 4 of the electronic control assembly (1).
Connect the brewer to the power source. The
indication must be:
a.) 208 volts ac for three wire 120/208 volt models
and 240 volts ac for three wire 120/240 volt
models after a delay of approximately 1 second.
b.) 200 to 240 volts ac for two wire 208 or 240 volt
models after a delay of approximately 1 second.
10. Touch the screw head end of the probe to the
brewer housing. The indication must be 0.
TURN TEMPERATURE
ADJUSTING SCREW (16)
CLOCKWISE CONTINUOUSLY
YES
ADJUST FOR CORRECT
WATER TEMPERARURE
NO
YES
REPLACE CONTROL
ASSEMBLY (1)
VOLTAGE PRESENT
REPLACE TANK
HEATER (5)
NO
LIMIT THERMOSTAT (6)
OK
?
NO
REPLACE LIMIT
THERMOSTAT (6)
YES
REPLACE CONTROL
ASSEMBLY (1)
MEASURE VOLTAGE
AT TANK HEATER (5)
REPLACE TRIAC (17)
VOLTAGE PRESENT
NO
CHECK FOR SPLIT
TANK HEATER (5)
REINSTALL ORIGINAL
CONTROL ASSEMBLY (1)
YES
RECHECK WATER
TEMPERATURE
P810
27040 041100
Page 25
SERVICE (cont.)
assembly (1).
ELECTRONIC CONTROLS (cont.)
NOTE - each temperature sensor is calibrated to an
electronic control assembly. Both components MUST
be replaced as a set.
PROBLEM:
WATER BOILS
7. With a voltmeter, check the voltage across the tank
heater (5) terminals. Connect the brewer to the
power source. The indication must be:
a.) 208 volts for three wire 120/208 volt models
and 240 volts for three wire 120/240 volt models
while the red indicator on the circuit board is on or
blinking.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models while the red indicator on the circuit board
is on or blinking.
8. Disconnect the brewer from the power source.
DRAIN CUP (4)
RETRY
LED (13)(15) ON
WHILE BOILING
YES
REPLACE CONTROL
ASSEMBLY (1)
NO
DISCONNECT BLUE WIRE
FROM CONTROL BOARD PIN #7
RETRY
STILL BOILING
?
NO
CHECK FOR SPLIT
TANK HEATER (5)
If voltage was present as described, the temperature
control of the system is operating properly.
If voltage was not present as described, contact BunnO-Matic to order an electronic control assembly (1),
temperature sensor (8), and triac assembly (17) for
revaluation and proceed to #9.
REPLACE TRIAC (17)
NO
REPLACE CONTROL
ASSEMBLY (1)
P811
Temperature Control Test Procedure
1. Disconnect the brewer from the power source.
2. With a voltmeter, check the voltage across terminals 3 & 4 of the electronic control circuit board.
Connect the brewer to the power source. The
indication must be:
a.) 208 volts ac for three wire 120/208 volt models
and 240 volts ac for three wire 120/240 volt
models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
3. Disconnect the brewer from the power source.
If voltage was present as described, proceed to #4.
If voltage was not present as described, refer to the
Wiring Diagrams and check brewer wiring harness.
4. Connect the brewer to the power source and place
the tank heater switch in the “ON” position.
5. Observe the red indicator on the electronic control
circuit board (15).
6. Disconnect the brewer from the power source.
If the indicator was on or blinking, the temperature
sensor is operating properly, proceed to #7.
If the indicator was off, check the sensor connection
on the electronic control circuit board and/or replace
the temperature sensor (8) and the electronic control
9. Replace the electronic control assembly (1) and
temperature sensor (8).
NOTE - each electronic control assembly is calibrated
to a temperature sensor. Both components MUST be
replaced as a set.
10. With a voltmeter, check the voltage across the tank
heater terminals (5). Connect the brewer to the
power source. The indication must be:
a.) 208 volts ac for three wire 120/208 volt models
and 240 volt ac for three wire 120/240 volt models
while the red indicator on the circuit board is on or
blinking.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models while the red indicator on the circuit board
is on or blinking.
11. Disconnect the brewer from the power source.
If voltage was present as described, return the new
triac assembly (17) to Bunn-O-Matic for credit. The
temperature control of the system is operating properly.
If voltage was not present as described, reinstall your
existing electronic control assembly (1) and temperature sensor (8), and proceed to #12.
12. Replace the triac assembly (17).
13. With a voltmeter, check the voltage across the tank
27040 041100
Page 26
R
E
A
D
GRY to GRY to
InterLock Assy
O
N
F
OF
heater terminals (5). Connect the brewer to the
power source. The indication must be:
a.) 208 volts ac for three wire 120/208 volt models
and 240 volts ac for three wire 120/240 volt
models while the red indicator on the circuit board
is on or blinking.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models while the red indicator on the circuit is on
or blinking.
14. Disconnect the brewer from the power source.
P C
O TI
T O
S N
E
SERVICE (cont.)
ELECTRONIC CONTROL ASSEMBLY (cont.)
h
WHI & WHI to
Temperature Sensor
N witc
IO eater Sucet!
UTe TankpHened ilFl aFill er!
A
C Th O k W Pow
P1
P2
PNK (Top) &
GRY (Bottom) to
Interlock Assy
P4
P3
! rn On s Fromter Taten d Tok In !
n ns
e
Tu
Wa ec Ta
T Com s – onn ter uctio
NO ater ystemnit Is Che Wan Instr nty!
O
D til W ter S en U Fill T llatio arra
h
a
ta
–
n
U ot W lly W ers e Ins ids W
H tica rew Th
Vo
a B
h
tom ee Wit mply
Au Coff nce
o
rda To C
co
Ac ure
il
Fa
ING
RN
WA
S
OU
RD E
ZA G
HA OLTA
M
V
RO
TF E
EC RC G!
NN OU
CO R S OVIN
IS
E
D W REM
PO RE
FO
BE
PNK (Top) & GRY
(Bottom) from LED
If voltage was present as described, the temperature
control of the system is operating properly. Return the
new electronic control assembly (1) and temperature
sensor (8) to Bunn-O-Matic for credit.
DO
!
ON
N
P TICE
Un OT
til W Tu
OFFSTO NO
ate rn O
AD
RE
Au Hot W r Co n Th
tom a
me e T
ati ter
s
a
Fr nk
C ca Sy
H
Ac offee lly W stem om
co
Op eate
rda Bre hen U s –
r
e
W
w
Fa nce W ers nit Is ater ned Swit
ilu
Fa ch
–
re ith Th Fill TConn Tank
u
To
e In he ecte Wil cet!
W d lF
C
s
O
N
N
UT
IO
Electronic Controls Removal and Replacement
NOTE - each electronic control assembly is calibrated
to a temperature sensor. Both components MUST be
replaced as a set.
1. Remove all wires from the electronic control assembly terminals.
2. Remove the two 8-32 screws holding the electronic control assembly to the component bracket.
3. Disconnect the temperature sensor and ready
indicator wires from the left side of the electronic
control assembly board.
4. Remove the temperature sensor from the grommet in the tank lid.
5. Install the new temperature sensor into the grommet on the tank lid. Route the wires to the location
of the new electronic control assembly.
6. Attach the temperature sensor and ready indicator
wires to the electronic control assembly.
7. Fasten the new electronic control assembly to its
bracket.
8. Reconnect the wires.
9. Refer to Fig. 12 when reconnecting the wires.
10. Review the initial set-up procedures and adjust the
control as required for the desired temperature.
Triac Assembly Removal and Replacement
NOTE - each triac installation requires the use of an
approved silicone heat sink compound. Bunn-OMatic recommends the use of Dow Corning 340 compound or equivalent. It can be purchased direct from
Bunn-O-Matic (part number M2522.0002).
om
N
ta
a
T ill
ply llationter Tao Pow
In nk er!
Vo
ids struc In
Wa tions
rra !
nty
!
WA
RN
IN
G
HA
ZA
VO RDO
LT US
A
GE
DIS
C
PO ONN
BE WE ECT
FO R S FR
RE OU O
RE RC M
MO E
VIN
G!
O
CA
#7 BLU from Triac Assy
#6 WHI/BRN to Tank Heater Switch
TAN from Triac Assy to Tank Heater
Switch
#5 PNK to Liquid Level Probe
#4 RED to Terminal Block (Red Insert)
#3 BLK to RED Lead from Liquid Level
Switch
#2 GRN to Ground
#1 WHI/BLU to Solenoid
FIG. 12 ELECTRONIC CONTROL BOARD
TERMINALS
P784
1. Place the tank heater switch on the electronic
control assembly in the “OFF” position.
2. Completely drain the tank.
3. Place a stryofoam or wood block between the
center of the tank and the rear of the brewer.
4. Disconnect triac wires, white/violet from terminal
block, blue from right tank heater, blue from
electronic control and tan from tank heater switch.
5. Carefully set the brewer on its back.
6. Remove the two 2" dia. hole plugs from the bottom
cover.
7. Remove the four #10-32 keps nut securing tank to
tank mounting bracket.
8. Remove the twelve #8-32 slotted head screws
securing the bottom cover.
9. Remove the bottom cover with the four feet, the
tank mounting brackets, triac/heat sink as an
assembly.
10. Remove triac/heat sink from right tank mounting
bracket and discard.
27040 032201
Page 27
SERVICE (cont.)
ELECTRONIC CONTROL ASSEMBLY (cont.)
11. Install new triac/heat sink assembly on right tank
mounting bracket.
12. Route the wires up around the rear of the brewer.
13. Reinstall the bottom cover, four feet, tank mounting brackets and triac/heat sink to the bottom of
the tank using four #10-32 keps nuts.
14. Secure bottom cover to brewer base with twelve
#8-32 slotted head screws.
15. Stand the brewer upright.
16. Reconnect the wires of the new triac assembly.
Refer to Fig. 13 when reconnecting wires.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Remove all wires from the switch terminals.
3. Place the selector switch in the left position.
4 Check for continuity across the center and right
terminals on the rear of the switch.
5. Continuity must not be present across the center
and left terminals on the rear of the switch.
6. Check the bottom row, then the top row of terminals.
If continuity is present as described proceed to #7.
If continuity is not present as described replace the
switch.
7. Place the selector switch in the right position.
8. Check for continuity across the center and left
terminals on the rear of the switch.
9. Continuity must not be present across the center
and right terminals on the rear of the switch.
10. Check the bottom row, then the top row.
WHI/VIO to Terminal Block (200V-240V Red
Insert)
BLU to Right Tank Heater (Left)
BLU to Electronic Control #7
TAN to Tank Heater Switch
If continuity is present as described, reconnect the
wires, the switch is operating properly.
If continuity is not present as described, replace the
switch.
P785
FIG. 13 TRIAC TERMINALS
GRINDER SELECTOR SWITCH
11. Refer to Fig. 15 when reconnecting the wires.
1 1⁄2
PNK to PNK Lead from
Right Brew Selector Switch
PNK to PNK Lead from Interface
Socket
gal
1 gal
1⁄2
gal
Y
AD
RE
OR
CT
LE
SE
ON
/W
AR
ME
R
T
AR
ST
1 1⁄2
gal
1 gal
1⁄2
gal
T
AR
ST
ON
/W
AR
ME
R
PNK to PNK Lead from
Left Brew Selector Switch
OR
CT
LE
SE
Y
AD
RE
P786
P787
FIG. 14 GRINDER SELECTOR SWITCH
FIG. 15 GRINDER SELECTION
SWITCH TERMINALS
Location:
The grinder selector switch is located in the upper
center on the front of the hood.
27040 032201
Page 28
SERVICE (cont.)
LEVEL CONTROL BOARD AND LEVEL PROBE (Electro/
mechanical only)
1 1⁄2
gal
1 gal
1⁄2
gal
AD
RE
Y
OR
CT
SE
LE
R
ON
ST
1 1⁄2
AR
AR
/W
ME
T
gal
1 gal
.
ES IC
UT AT C
MIN-O-M 0 VA
NN - 12
BU 20
26
P/N
1⁄2
gal
AR
T
ST
R
ON
/W
AR
ME
OR
.
ES IC
UT AT C
MIN-O-M 0 VA
NN - 12
BU 20
26
P/N
LE
SE
CT
Y
AD
N
:
W
A
R
M
E
R
S
A
N
D
S
U
R
F
A
C
E
S
A
R
E
H
O
T
RE
C
A
U
T
IO
HO
!
CA
UT
IO
T WA
TE
R
N
P796
FIG. 16 LIQUID LEVEL CONTROL BOARD
Location:
The level control board is located inside the front
of the brewer just left of center on the component
bracket
Test Procedure:
1. Disconnect the brewer from the power source.
2. Remove the violet wire from terminal 1 & pink wire
from terminal 4 of the circuit board.
3. With a voltmeter, check the voltage across terminals 2 & 3. Connect the brewer to the power
source. The indication must be:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the
Wiring Diagrams and check brewer wiring harness.
5. Reconnect the violet wire to terminal 1.
6. Carefully connect a piece of insulated jumper wire
to terminal 4. Keep the other end of this wire away
from any metal surface of the brewer.
7. With a voltmeter, check the voltage across terminals 1 & 3. Connect the brewer to the power
source. The indication must be:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models after a delay of
approximately 1 second.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models after a delay of approximately 1 second.
8. Touch the free end of jumper wire to the brewer
housing. The indication must be 0.
9. Move the jumper wire away from the brewer
housing. The indication must again be:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models after a delay of
approximately 1 second.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models after a delay of approximately 1 second.
10. Disconnect the brewer from the power source and
remove the jumper wire from terminal 4.
If voltage is present as described, the level control
board is operating properly, proceed to #11.
If voltage is not present as described, replace the level
control board.
11. Reconnect the pink wire to terminal 4.
12. Gently pull the probe out of the tank lid and inspect
for corrosion. Replace it if necessary.
13. Place the probe so that neither end is in contact
with any metal surface of the brewer.
14. With a voltmeter, check the voltage across terminals 1 & 3. Connect the brewer to the power
source. The indication must be:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models after a delay of
approximately 1 second.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models after a delay of approximately 1 second.
27040 032201
Page 29
SERVICE (cont.)
LEVEL CONTROL BOARD AND LEVEL PROBE (Electro/
mechanical only) (cont.)
15. Move the probe's flat end to the brewer housing.
The indication must be 0.
16. Move the probe's flat end away from the brewer
housing. The indication should again be:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
17. Disconnect the brewer from the power source.
If voltage is present as described, reinstall the probe,
the level control board and level probe are operating
properly.
If voltage is not present as described, check the pink
probe wire.
T4 PNK to Probe
T3 WHI to Terminal Block (White
Insert on 120V Two Wire, 120/208V
or 120/240V Three Wire Brewers)
T3 RED to Terminal Block (Red Insert
on 200V or 240V Brewers)
T2 BLU to Overflow Protection Switch
T1 VIO to Solenoid Coil
P789
FIG. 17 LIQUID LEVEL CONTROL BOARD
TERMINALS
Removal and Replacement:
1. Remove all wires from the level control board.
2. Remove two #8-32 slotted head screws holding
level control board to component bracket.
3. Install the new level control board to the component bracket. Make certain that the lockwashers
are between the level control board and the component bracket.
4. Refer to Fig. 17 when reconnecting the wires.
27040 032201
Page 30
SERVICE (cont.)
LIMIT THERMOSTAT
If voltage is present as described, reconnect the black
wire to the limit thermostat from the terminal block,
the limit thermostat is operating properly.
If voltage is not present as described, refer to the
Wiring Diagrams and check brewer wiring harness.
1 1⁄2
Removal and Replacement:
1. Remove all wires from the limit thermostat terminals.
2. Carefully remove the two #8-32 nuts securing the
limit thermostat to tank lid and remove limit thermostat.
3. Carefully secure new limit thermostat to tank lid.
4. Refer to Fig. 19 when reconnecting the wires.
gal
1 gal
1⁄2
gal
RE
Y
AD
OR
CT
LE
SE
ON
/
MER
WAR
T
AR
ST
1 1⁄2
gal
1 gal
.
ES
UT ATIC C
MIN-O-M 0 VA
NN 12
BU 2026
P/N
1⁄2
gal
T
AR
ST
MER
AR
ON
SE
/W
OR
CT
LE
Y
AD
RE
P790
FIG. 18 LIMIT THERMOSTAT
Location:
The limit thermostat is located inside the hood on
the tank lid just to the left of the right tank heater.
Test Procedure:
1. Disconnect the brewer from the power supply.
2. Disconnect the black wire from the limit thermostat to the terminal block.
3. With a voltmeter, check the voltage across the
black wire removed from the limit thermostat and
the black wires to the tank heater terminals.
4. Connect the brewer to the power supply.
5. The indication must be:
a.) 208 or 240 volts ac on electronic three wire
models.
b.) 120 volts ac on eletro/mechanical brewers.
c.) 200 or 240 volts ac on electro/mechanical or
electronic control two wire "A" or "B" models.
6. Disconnect the brewer from the power supply.
BLK to Terminal Block
(Black Insert)
BLK to Tank Heater
(Electronic)
BLK to Contactor Terminal
(Electro/mechanical)
P791
FIG. 19 LIMIT THERMOSTAT
TERMINALS
27040 032201
Page 31
SERVICE (cont.)
ON/OFF SWITCH (Warmers)
6. Check for continuity across the center and lower
left terminal with switch in the "ON" position.
Continuity must not be present when switch is in
the "OFF" position.
1 1⁄2
If continuity is present as described, reconnect the
black wire to the center terminal and the white/red wire
on the left switch or the white/violet on the right switch
to the lower left terminal.
If continuity is not present as described, replace the
switch.
gal
1 gal
1⁄2
gal
AD
Y
RE
CT
OR
LE
SE
ME
ON
/
R
WAR
T
AR
ST
1
1⁄2
gal
1 gal
1⁄2
gal
T
AR
ST
ON
/W
R
ME
AR
OR
CT
LE
SE
Y
AD
RE
P792
FIG. 20 ON/OFF SWITCHES
Location:
The ON/OFF switches are located on the front of
the hood just to the left and right of the start switches.
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 right terminal and the
black wire from the center terminal.
3. With a voltmeter, check the voltage across the
white wire and the black wire or red and black wire.
Connect the brewer to the power source. The
indication must be:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
4. Disconnect the brewer from the power source.
If voltage is present as described, reconnect the white
or the red wire, and proceed to #5.
If voltage is not present as described, refer to the
Wiring Diagrams and check the brewer wiring harness.
Removal and Installation:
1. Remove the wires from the switch terminals.
2. Compress the clips inside the hood and gently
push the switch through the opening.
3. Push the new switch into the opening and spread
the clips to hold switch in the hood.
4. Refer to Fig. 21 when reconnecting the wires.
BLK to Terminal
Block (Black Insert)
WHI/RED to Left
Timer TL1
LEFT
BLK to Terminal
Block (Black Insert)
WHI/VIO to Right
Timer TL1
RIGHT
WHI to Terminal Block
(White Insert on 120/
208V or 120/240V
Models)
RED to Terminal Block
(Red Insert on 200V or
240V Models)
WHI to Terminal Block
(White Insert on 120/
208V or 120/240V
Models)
RED to Terminal Block
(Red Insert on 200V or
240V Models)
P793
FIG. 21 ON/OFF SWITCH TERMINALS
5. With the black wire removed, remove the white/
red wire on the left switch or the white/violet wire
on the right switch from the lower left terminal.
27040 032201
Page 32
SERVICE (cont.)
OVERFLOW PROTECTION SWITCH
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the
Wiring Diagrams and check brewer wiring harness.
1 1⁄2
5. Check for continuity across the overflow protection switch red wires only until the plastic float is
raised and check that continuity returns when the
plastic float is again lowered.
gal
1 gal
1⁄2
gal
RE
LE
SE
ON
/ WA
CT
Y
AD
OR
ER
RM
If continuity is present as described, reconnect the red
wires to the blue wire from the thermostat or black
wire from electronic control assembly and the black
wire from terminal block.
If continuity is not present as described, replace the
overflow protection switch.
T
AR
ST
1 1⁄2
gal
1 gal
1⁄2
gal
T
AR
ST
TL1
TL2
TL3
TL4
TL5
ON
LE
SE
CT
ER
RM
/ WA
OR
J1
J2
TL1
TL2
TL3
TL4
TL5
Y
AD
RE
SET
SET
LOCK
LOCK
J1
J2
SET
SET
LOCK
LOCK
FIG. 22 OVERFLOW PROTECTION SWITCH
P2194
Location:
The overflow protection switch is located inside
the hood on the center of the tank inside the copper
overflow cup.
To test the overflow protection switch, access will
also be needed to the level control board or electronic
control assembly and terminal block.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Remove the wire nuts connecting the red wires
from the overflow protection switch to the black
wire from the terminal block and blue wire from the
thermostat or the black wire from the electronic
control assembly.
3. Carefully check the voltage across the violet wire
and the blue wire on electro/mechanical models or
the black wires on electronic models. Connect the
brewer to the power source. The indication must
be:
a.) 120 volts ac for electro/mechanical three wire
120/208 volt models and three wire 120/240 volt
models.
b.) 208 volts for electronic three wire 120/208 volt
models and 240 volts ac on 120/240 volt models.
c.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
4. Disconnect brewer from the power source.
Removal and Replacement:
1. Disconnect the red leads from the overflow protection switch from the blue wire from the thermostat or black wire from electronic control assembly
and the black wire from the terminal block.
2. Remove the nut beneath the copper overflow cup.
3. Remove the entire switch assembly from the cup.
4. Place the new switch assembly into the cup, wires
first. Make sure that the gasket is in place around
the threaded switch stem.
NOTE - The magnets must be at the top of float and
there must be NO adjusting washers installed for the
overflow protection switch to operate properly.
5. Install the nut beneath the copper overflow cup. Be
sure not to overtighten.
6. Refer to Fig. 23 when reconnecting wires.
RED to BLK Wire
form Terminal Block
RED to BLU Lead from
Thermostat
FIG. 23 OVERFLOW PROTECTION
SWITCH TERMINALS
P795
27040 032201
Page 33
SERVICE (cont.)
RELAY (Brewers W/Recovery Booster)
NOTE - Electro/mechanically controlled brewers have
two relays and the electronically controlled have one.
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
4. Disconnect 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 brewer wiring harness.
1 1⁄2
gal
5. Remove the white/green wire from the "A" terminal
and white/violet wire from the "B" terminal on the
right relay, the white/brown wire from the "A"
terminal and white/red wire from "B" terminal on
the left relay.
6. Check for continuity across the "A" and "B" terminals of each relay.
1 gal
1⁄2
gal
AD
RE
CT
SE
ON
ST
1 1⁄2
AR
/ WA
RM
Y
OR
LE
ER
T
gal
1 gal
S
.
TE IC
NU AT C
MI -O-M 0 VA
NN - 12
BU 20
26
P/N
1⁄2
gal
ST
ON
S
TE IC
NU AT C
MI -O-M 0 VA
NN - 12
BU 20
26
P/N
.
LE
SE
AR
T
ER
RM
/ WA
OR
Y
If continuity is present as described, reconnect the
white/green wire and white/violet wire to the right relay
or the white/brown wire and the white/red wire to the
left relay and proceed to #7.
If continuity is not present as described, replace the
relay(s).
R
TE
T WA
HO
C
A
U
T
IO
N
:
W
A
R
M
E
R
S
A
N
D
S
U
R
F
A
C
E
S
A
R
E
H
O
T
AD
RE
CT
!
ION
UT
CA
P796
FIG. 24 RELAY
Location:
Electro/mechanically Controlled Brewers
The relays are located inside the hood, the right
relay just to the right of the contactor in front of the
tank and left relay is just left of the component bracket
in front of the tank.
Electronically Controlled Brewers
The relay is located inside the hood just to the right
of the contactor in front of the tank.
Test Procedures:
Electro/mechanically Controlled Brewers.
1. Disconnect the brewer from the power source.
2. Locate the black wire on the left center relay
terminal and the blue wire on the right center relay
terminal.
3. With a voltmeter, check the voltage across the
black and blue wire. Connect the brewer to the
power source . The indication must be:
7. Remove the two blue wires from terminal 5 and the
red wire from terminal 7 on the right relay, the
black wires from terminal 5 and the red wire from
terminal 7 on the left relay.
8. Check for continuity across terminals 5 and 7 of
each relay by manually closing relay contact. Continuity must not be present when contact is released.
If continuity is present as described, reconnect blue
wires to terminal 5 on the right relay, the black wires
to terminal 5 on the left relay and the red wire to left and
right terminal 7, the relays are operating properly.
If continuity is not present as described, replace the
relay(s).
Electronically Controlled Brewers
1. Disconnect brewer from the power source.
2. Locate the gray wire on terminal 7 and the white/
green wire on terminal B of the relay.
27040 032201
Page 34
SERVICE (cont.)
Relay (Brewers W/Recovery Booster) (cont.)
6. Check for continuity across the relay terminals 5
and 7 by manually closing relay contact. Continuity must not be present when contact is released.
3. Check the voltage across the gray and white/green
wire with left and right "ON/OFF" switch in the "ON"
position. Connect the brewer to the power source
and press the left and right start switch. The
indication must be:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
4. Disconnect brewer from the power source.
If continuity is present as described, reconnect the
wires, the relay is operating properly.
If continuity is not present as described, replace the
relay.
Removal and Replacement:
1. Remove all wires from relay terminals.
2. Remove the #8-32 slotted screw holding relay
mounting bracket to the hood.
3. Remove the relay from the mounting bracket.
4. Securely install the new relay to the mounting
bracket.
5. Install the relay mounting to the hood.
6. Refer to Fig. 25 when reconnecting the wires.
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the
Wiring Diagrams and check brewer wiring harness.
5. Locate the white/red wire on the relay terminal 5
and the gray wire relay terminal 7.
LEFT
RIGHT
RED
7
7
5
BLK to BLK Lead on Contactor
Coil
BLK to BLK Lead on Thermostat
B
A
WHI/RED to Left Dispense Valve
WHI/BRN to Left Dispense
Valve
WHI/GRN to Right Dispense
Valve
A
5
B
BLU to BLU Lead from Thermostat
BLU to BLU Lead from Liquid Level Board
WHI/VIO to Right Dispense
Valve
MECHANICAL THERMOSTAT W/RECOVERY BOOSTER
B
GRY to BLK Lead from
Contactor Coil
7
WHI/VIO to Right Dispense
Valve
A
WHI/GRN to Right
Dispense Valve
5
WHI/RED to Left Dispense
Valve
ELECTRONIC CONTROL W/RECOVERY BOOSTER
FIG. 25 RELAY TERMINALS
P797
27040 032201
Page 35
wires and proceed to #6.
If continuity is not present as described, replace the
solenoid valve.
SERVICE (cont.)
SOLENOID VALVE (Inlet)
AR
ST
1 1⁄2
T
6. Check the solenoid valve for coil action. Connect
the brewer to the power source. Listen carefully in
the vicinity of the solenoid valve for a "clicking"
sound after approximately 1 second, 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 or after 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.
gal
1 gal
S
.
TE IC
NU AT C
MI -O-M 0 VA
NN - 12
BU 20
26
P/N
1⁄2
gal
AR
ST
ON
S
.
TE IC
NU AT C
MI -O-M 0 VA
NN - 12
BU 20
26
P/N
LE
SE
T
ER
RM
OR
CT
Y
AD
N
:
W
A
R
M
E
R
S
A
N
D
S
U
R
F
A
C
E
S
A
R
E
H
O
T
RE
/ WA
T WA
TE
R
C
A
U
T
IO
HO
!
CA
UT
ION
FIG. 26 SOLENOID VALVE
P796
Location:
The solenoid valve is located inside the lower right
front of the brewer.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Remove both wires from the solenoid valve coil
terminals.
3. With a voltmeter, check the voltage across the
removed wires:
a.) Violet and white on 120/208 volt and 120/240
volt three wire electro/mechanical models.
b.) Violet and red on 200 volt and 240 volt electro/
mechanical models.
c.) White/blue and white on 120/208 volt and 120/
240 volt electronic models.
d.) White/blue and red on 200 volt and 240 volt
electronic models.
Connect the brewer to the power source. The
indication must be:
a.) 120 volts ac for 120/208V and 120/240V three
wire models.
b.) 200 to 240 volts ac for 200V or 240V two wire
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 brewer wiring harness.
Removal and Replacement:
1. Remove all wires from the solenoid valve coil.
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 slotted head screws holding the solenoid valve and mounting bracket to the
brewer trunk.
5. Lift out the solenoid valve.
6. Remove the two #10-32 slotted head screws holding the solenoid valve to the mounting bracket.
7. Securely install the new solenoid valve to its mounting bracket.
8. Attach the solenoid valve and mounting bracket to
the brewer trunk.
9. Securely fasten the water lines to and from the
solenoid valve.
10. Refer to Fig. 27 when reconnecting the wires.
5. Check for continuity across the solenoid valve coil
terminals.
If continuity is present as described, reconnect the
WHI to Level Control Board T3 (120/208V or 120/
240V Eletro/mechanical)
WHI to Terminal Block (120/208V or 120/240V
Electronic)
RED to Level Control Board T3 (200 or 240V
Electro/mechanical or Control Assy T4 Electronic)
VIO to Level Control Board T1 (Electro/
mechanical)
WHI/BLU to Control Assy #1 (Electronic)
P799
FIG. 27 SOLENOID VALVE TERMINALS
27040 032201
Page 36
SERVICE (cont.)
If continuity is present as described, reconnect the
wires, the switch is operating properly.
If continuity is not present as described, replace the
switch.
START SWITCHES
1 1⁄2
Removal and Replacement:
1. Remove all 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 the switch in the hood.
4. Refer to Fig. 29 when reconnecting the wires.
gal
1 gal
1⁄2
gal
Y
AD
RE
OR
CT
LE
SE
ON
/
WAR
ME
R
T
AR
ST
1
1⁄2
gal
1 gal
1⁄2
gal
T
AR
ST
ON
/W
AR
ME
R
OR
CT
LE
SE
Y
AD
RE
FIG. 28 START SWITCHES
ORN to Left Timer TL3 (Electro/
mechanical)
P792
Location:
The momentary start switches are located in front
of hood just left and right of center.
Test Procedure:
1. Disconnect the brewer from the power source and
remove the wires from both terminals of the switch.
2. 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.
RED/BLK to Interlock Assy (Electronic)
YEL to Left Timer TL5
WHI/ORN to Right Timer TL3 (Electro/
mechanical)
BRN/BLK to Interlock Assy (Electronic)
WHI/YEL to Right Timer TL5
P801
FIG. 29 START SWITCH TERMINALS
27040 032201
Page 37
SERVICE (cont.)
tank heater(s).
NOTE - If the tank heater remains unable to heat,
remove and inspect the heater for cracks in the sheath.
TANK HEATERS
Electronic Models:
1. Disconnect the brewer from the power source.
2. Disconnect wires from heater(s).
3. Check for continuity across the tank heater terminals.
1 1⁄2
gal
1 gal
1⁄2
gal
Y
AD
RE
SE
ON
OR
CT
LE
MER
AR
/W
T
AR
ST
1 1⁄2
gal
1 gal
.
ES
IC
UT
MIN -MATVAC
-O 0
NN 12
BU 2026
P/N
1⁄2
gal
T
AR
ST
ON
MER
AR
/W
OR
CT
LE
SE
Y
AD
RE
P790
FIG. 30 TANK HEATERS
Location:
The tank heaters are located on the left and right
side of the tank lid.
Test Procedure:
Electro/Mechanical Models.
1. Disconnect the brewer from the power supply.
2 Check the voltage across the black and the red
wires on 120/208V or 120/240V models on the
tank heaters. With the control thermostat turned to
the "ON" position (fully clockwise), connect the
brewer to the power supply and with a voltmeter,
check the voltage across the wires. The indication
should be:
a.) 208 volts ac for three wire 120/208 volt models
and 240 volts ac for three wire 120/240 volt
models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
3. Disconnect the brewer from the power supply.
If continuity is present as described, 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 the heaters for cracks in the
sheath.
Removal and Replacement:
1. Remove wires from tank heater.
2. Remove the four #8-32 nuts securing tank heater
to tank lid.
3. Remove tank heater and gasket.
4. Install new tank heater and gasket with four #8-32
nuts on tank lid.
5. Refer to Fig. 31 when reconnecting the wires.
BLK to Contactor
RED to Contactor
LEFT & RIGHT
ELECTRO/MECHANICAL
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the
Wiring Diagrams and check the wiring harness.
BLU
BLK
BLK to Terminal Block
(Black Insert)
4. Remove the black and red wires from the tank
heaters.
5. Check for continuity across the terminals of the
tank heaters.
If continuity is present as described, reconnect the
wires, the tank heaters are operating properly.
If continuity is not present as described, replace the
LEFT
ELECTRONIC
BLU Lead from
from Triac Assy.
RIGHT
P803
FIG. 31 TANK HEATER TERMINALS
27040 032201
Page 38
SERVICE (cont.)
NOTE: ECA MODELS ONLY - Brewer must be at
operating temperature to perform step 5 or brew-lock
must be bypassed. To bypass brew-lock disconnect
white/orange wire and brown/black wire for right timer
or orange wire and red/black wire for left timer from
brew-lock of ECA and connect the harness leads
together.
TIMERS (Early Models)
1 1⁄2
5. Check for continuity across the white/orange wire
and white/yellow wire from the right timer or the
orange wire and yellow wire on the left timer when
the start switch is pressed.
gal
1 gal
1⁄2
gal
Y
AD
RE
OR
CT
SE
ON
AR
ST
1 1⁄2
/ WA
RM
LE
ER
T
gal
1 gal
S
.
TE IC
NU AT C
MI -O-M 0 VA
NN - 12
BU 20
26
P/N
1⁄2
gal
AR
ST
ON
S
TE IC
NU AT C
MI -O-M 0 VA
NN - 12
BU 20
26
P/N
.
LE
SE
RE
/ WA
T
ER
RM
OR
CT
Y
AD
N
:
W
A
R
M
E
R
S
A
N
D
S
U
R
F
A
C
E
S
A
R
E
H
O
T
If continuity is present as described, reconnect the
wires to terminals TL3, TL4 and TL5 of the timer board
and brew-lock wires if necessary, and proceed to #6.
T WA
TE
R
C
A
U
T
IO
HO
!
EARLY MODELS
CA
UT
ION
P796
FIG. 32 TIMERS
Location:
The timers are located inside the left front of the
brewer on the upper part of the component bracket.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the wires from the timer terminals
TL3, TL4 and TL5 and rotate the dial(s) fully
counterclockwise.
3. 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 three wire 120/208 volt models
and three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the
Wiring Diagrams and check brewer wiring harness.
6. Check the voltage across terminals TL1 and TL4
with a voltmeter 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:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models for approximately 1 minute for 1-1/2 gallon batch.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models for approximately 1 minute for 1-1/2 gallon batch.
7. Select a 1 gallon batch and repeat #6. The indication should remain for approximately 40 seconds.
8. Select a 1/2 gallon batch and repeat #6. The
indication should remain approximately 20 seconds.
Removal and Replacement:
1. Remove all wires from the timer.
2. Remove the four #6-32 slotted head screws holding circuit board and dial plate on to the component mounting bracket.
3. Remove circuit board, nylon spacers and dial
plate.
4. Install new timer circuit board as described in
Digital Timer section on the following pages.
5. Refer to Fig. 36 when reconnecting wires.
6. Install the timer setting decal provided with the
replacement timer kit, on the inside of the front
access panel.
7. Adjust timer as required. Refer to Digital Timer
section on the following pages.
27040 032201
Page 39
SERVICE (cont.)
Timers (Early Models)(cont.)
.
ES
UT ATIC C
MIN-O-M 0 VA
2
NN 1
BU 6202
P/N
.
ES
UT ATIC C
MIN-O-M 0 VA
2
NN 1
BU 6202
P/N
WHI/VIO TL1 to Right ON/OFF Switch
WHI/VIO TL1 to Right Warmer Element
WHI TL2 To Terminal Block and Warmer Element
(White Insert on 120/208V and 120/240V Three Pole
Terminal Blocks)
RED TL2 to Terminal Block (Red Insert on 200V or
240V Two Pole Terminal Blocks.
WHI/RED TL1 to Left ON/OFF Switch
WHI/RED TL1 to Left Warmer Element
WHI TL2 To Terminal Block and Warmer Element
(White Insert on 120/208V and 120/240V Three Pole
Terminal Blocks)
RED TL2 to Terminal Block (Red Insert on 200V or
240V Two Pole Terminal Blocks.
ORA TL3 to Left Start Switch
WHI/BRN TL4 to Left Dispense Valve
YEL TL5 to Left Start Switc
WHI/ORA TL3 to Right Start Switch
WHI/GRN TL4 to Right Dispense Valve
WHI/YEL TL5 to Right Start Switch
LEFT
RIGHT
SINGLE BATCH MACHINE ONLY
5
IC
AT
-M
-O
4
NN
BU
5
3
2
6
2
2.5
1.5
1
U
MIN
TE
UT
5
7
E
UT
IC
AT
-M
-O
4
NN
BU
5
3
S
2
MIN
0
00
6-0
48
24
2
2.5
1.5
ES
3
S
P/N
6
8
1
MIN
1
.5
4
3
2
4
6
7
3
8
2
6
S
TE
INU
1
M
1
AC
0V
12
1
3
.5
S
TE
INU
M
P/N
ES
UT
AC
MIN
0V
12
00
-00
6
48
24
WHI/RED TL1 to Left ON/OFF Switch
WHI/RED TL1 to Left Warmer Element
WHI TL2 To Terminal Block and Warmer Element
(White Insert on120/208V and 120/240V Three
Pole Terminal Blocks)
RED TL2 to Terminal Block (Red Insert on 200V or
240V Two Pole Terminal Blocks.
ORA TL3 to Left Start Switch
WHI/BRN TL4 to Left Dispense Valve
YEL TL5 to Left Start Switch
WHI/VIO TL1 to Right ON/OFF Switch
WHI/VIO TL1 to Right Warmer Element
WHI TL2 To Terminal Block and Warmer Element
(White Insert on 120/208V and 120/240V Three
Pole Terminal Blocks)
RED TL2 to Terminal Block (Red Insert on 200V or
240V Two Pole Terminal Blocks.
WHI/ORA TL3 to Right Start Switch
WHI/GRN TL4 to Right Dispense Valve
WHI/YEL TL5 to Right Start Switch
LEFT
RIGHT
ELECTRO/MECHANICAL
(120/208V AC or 120/240V AC 3 WIRE, 200V AC or 240V AC 2 WIRE)
FIG. 33 TIMER TERMINALS
P805
27040 032201
Page 40
SERVICE (cont.)
Timers (Early Models)(cont.)
.
ES
UT ATIC C
MIN-O-M 0 VA
2
NN 1
BU 6202
P/N
.
ES
UT ATIC C
MIN-O-M 0 VA
2
NN 1
BU 6202
P/N
WHI/VIO TL1 to Right ON/OFF Switch
WHI/VIO TL1 to Right Warmer Element
WHI TL2 To Terminal Block and Warmer Element
(White Insert on120/208V or 20/240V Three
Pole Terminal Blocks)
RED TL2 to Terminal Block (Red Insert on 200V or
240V Two Pole Terminal Blocks.
WHI/RED TL1 to Left ON/OFF Switch
WHI/RED TL1 to Left Warmer Element
WHI TL2 To Terminal Block and Warmer Element
(White Insert on 120/208V or 120/240V Three
Pole Terminal Blocks)
RED TL2 to Terminal Block (Red Insert on 200V or
240V Two Pole Terminal Blocks.
ORA TL3 toInterlock Assy
WHI/BRN TL4 to Left Dispense Valve
YEL TL5 to Left Start Switch
WHI/ORA TL3 to Interlock Assy
WHI/GRN TL4 to Right Dispense Valve
WHI/YEL TL5 to Right Start Switch
LEFT
RIGHT
SINGLE BATCH MACHINE ONLY
5
IC
4
AT
2
2
2.5
1.5
3
6
5
7
-M
-O
NN
BU
IC
8
5
BU
1
ES
UT
MIN
2
ES
UT
AC
MIN
0V
12
0
00
6-0
48
3
ES
UT
MIN
P/N
1
3
.5
8
5
2
1
ES
UT
MIN
ES
UT
AC
MIN
0V
12
00
-00
86
1
24
6
3
4
6
2
2.5
1.5
1
1
.5
3
7
-M
-O
NN
2
6
4
AT
3
4
ES
UT
MIN
4
24
P/N
WHI/RED TL1 to Left ON/OFF Switch
WHI/RED TL1 to Left Warmer Element
WHI TL2 To Terminal Block and Warmer Element
(White Insert on120/208V or 120/240V Three
Pole Terminal Blocks)
RED TL2 to Terminal Block (Red Insert on 200V or
240V Two Pole Terminal Blocks.
ORA TL3 to Interlock Assy
WHI/BRN TL4 to Left Dispense Valve
YEL TL5 to Left Start Switch
WHI/VIO TL1 to Right ON/OFF Switch
WHI/VIO TL1 to Right Warmer Element
WHI TL2 To Terminal Block and Warmer Element
(White Insert on 120/208V or 120/240V Three
Pole Terminal Blocks)
RED TL2 to Terminal Block (Red Insert on 200V or
240V Two Pole Terminal Blocks.
WHI/ORA TL3 Interlock Assy
WHI/GRN TL4 to Right Dispense Valve
WHI/YEL TL5 to Right Start Switch
LEFT
RIGHT
ELECTRONIC
(120/208V AC or 120/240V AC 3 WIRE, 200V AC or 240V AC 2 WIRE)
P847
FIG. 34 TIMER TERMINALS
27040 032201
Page 41
SERVICE (cont.)
TIMERS (Late Models)
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.
1 1⁄2
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.
gal
1 gal
1⁄2
gal
RE
LE
SE
ON
CT
Y
AD
OR
ER
RM
/ WA
T
AR
ST
1 1⁄2
gal
1 gal
1⁄2
gal
T
AR
ST
TL1
TL2
TL3
TL4
TL5
ON
LE
SE
CT
ER
RM
/ WA
OR
J1
J2
TL1
TL2
TL3
TL4
TL5
Y
AD
RE
SET
SET
LOCK
LOCK
J1
J2
SET
SET
1.0000)
ol # 22300.0750
.500 gpm FLOW
erating pressure
#20526.0750)
LOCK
LOCK
LATE MODELS
P2194
FIG. 35 DIGITAL TIMER
Location:
The timers are located inside the left front of the
brewer on the upper part of the component bracket.
Test Procedure.
NOTE: Do not remove or install wires while timer board
is installed. Pressure applied to one side may cause
damage to the board.
1. Disconnect the brewer from the power source and
remove the front access panel.
2. Remove the two #8-32 screws 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, three
wire 120/208 volt models and 120/240 volt models.
b) 200 to 240 volts ac on two wire 200 volt or 240
volt models.
5. Disconnect the brewer from the power source.
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 harness.
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, three
wire 120/208 volt models and 120/240 volt models.
b) 200 to 240 volts ac on two wire 200 volt or 240
volt models.
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:
NOTE: Do not remove or install wires while timer board
is installed. Pressure applied to one side may cause
damage to the board.
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. 36 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:
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.
27040 032201
Page 42
SERVICE (cont.)
TIMERS (Late Models)(cont.)
1. Modifying brew volumes. To modify a brew volume, 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
until three distinct clicks are heard and then release
the switch. (Failure to release the switch within two
seconds after the third click causes the volume setting to be aborted and previous volume setting will
remain in memory.)
View the level of the liquid being dispensed. When
the desired level is reached, turn the ON/OFF switch
to “OFF”.
NOTE: Several ounces of water will continue to 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.
LEFT TIMER
RIGHT TIMER
YEL
WHI/BRN
ORA
WHI
WHI/YEL wire to TL5
WHI/GRN wire to TL4
WHI/ORA wire to TL3
WHI wire to TL2 (120V Two Pole,
120/208V or 120/240V Three Pole
Terminal Block)
RED wire to TL2 (200V or 240V
Two Pole Terminal Block)
WHI/VIO wire to TL1
RED
WHI/RED
P2037
FIG. 36 DIGITAL TIMER TERMINALS
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.
27040 032201
Page 43
5. Check the continuity across the two terminals on
the warmer element.
SERVICE (cont.)
WARMER ELEMENTS
1 1⁄2
If continuity is present as described, reconnect the
white or red and white/red wires on the left warmer
element or the white or red and white/violet wires on
the right warmer element.
If continuity is not present as described, replace the
warmer element.
gal
1 gal
1⁄2
gal
AD
RE
SE
ON
/ WA
RM
LE
CT
Y
OR
ER
T
AR
ST
1 1⁄2
gal
1 gal
S
TE IC
NU AT C
MI -O-M 0 VA
NN - 12
BU 20
N 26
.
P/
1⁄2
gal
AR
ST
ON
S
.
TE IC
NU AT C
MI -O-M 0 VA
NN - 12
BU 20
26
P/N
CT
/ WA
T
ER
RM
OR
LE
SE
AD
Y
R
TE
T WA
HO
C
A
U
T
IO
N
:
W
A
R
M
E
R
S
A
N
D
S
U
R
F
A
C
E
S
A
R
E
H
O
T
RE
!
ION
UT
CA
P796
Removal and Replacement:
1. Remove the three #4-40 slotted head screws securing the warmer assembly to the brewer base.
2. Lift the warmer assembly from the brewer base.
3. Disconnect the two wires from the warm 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 in brewer base.
8. Refer to Fig. 38 when reconnecting wires.
FIG. 37 WARMER ELEMENTS
Location:
The warmer elements are located in the base of the
brewer under the warmer plate.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Using the white wire in the terminal block and the
white/red wire to left warmer or the white/violet
wire to right warmer check the voltage. With a
voltmeter, check voltage across the white and
white/red wire or the white wire and white/violet
wire with the "ON/OFF" switch in the "ON" position.
The indication must be 120 volts ac for three wire
120/208 volt models and three wire 120/240 volt
models.
3. With a voltmeter, check the voltage across the red
wire and white/red wire or red wire and white/
violet wire with the "ON/OFF" switch in the "ON"
position. The indication must be 200 to 240 volts
ac for two wire 200 or 240 volt models.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the
Wiring Diagrams and check brewer wiring harness.
WHI/RED to Left Timer TL1
WHI to Terminal Block (White Insert
on Three Pole Terminal Blocks or
Red Insert on Two Pole Terminal Blocks)
WHI or Red to Right Warmer Element
LEFT WARMER
ELEMENT
WHI to Terminal Block (White Insert on
Three Pole Terminal Blocks or Red Insert
on Two Pole Terminal Blocks)
WHI or Red to Left Warmer Element
WHI/VIO to Right Timer TL1
RIGHT WARMER
ELEMENT
P807
FIG. 38 WARMER ELEMENT TERMINALS
27040 032201
Page 44
SCHEMATIC WIRING DIAGRAM DUAL BREWER
(W/TWO-GRINDER INTERFACE)
L1
L2 N
GRN
LIMIT THERMOSTAT
BLK-12
BLK-12
BLK-12
K1
N.O.
RED-12
TANK HEATERS (TWO)
BLK-12
RED-12
RED-12
K1
N.O.
READY INDICATORS
OVERFLOW
PROTECTION SW
BLK
RED
SW. & THERMOSTAT
RED
BLU
WHI
K1
OPTIONAL
RECOVERY BOOSTER
BLU
RED
K2 N.O.
LIQUID 1
LEVEL 2
BOARD 3
BLK
K3 N.O.
4
VIO
BLU
WHI
SOL
WHI
PIN-20
PROBE
BLK
OPTIONAL 3-SET SELECTOR SWITCHES SHOWN
WITH TWO-GRINDER INTERFACE OPTION
TAN
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
3/4 BATCH
BATCH COMMON
WHI/VIO
S
E
L
E
C
T
O
R
S
W
WHI/ORA
WHI/GRN
WHI/YEL
SOL
OPTIONAL
RECOVERY BOOSTER
WHI/VIO
WHI/GRN
SOL
WHI
WHI
K2
WHI/GRN
WHI/RED
4
GRY 3 GRINDER
PNK 2 INTERFACE
CONNECTOR
TAN 1
S
W
S
E
L
E
C
T
O
R
WHI/VIO
WHI/VIO
WATER
BYPASS
R
T
L
T
1
RIGHT 2
BREW
3
TIMER
4
5
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
4
GRY 3 GRINDER
PNK 2 INTERFACE
CONNECTOR
TAN 1
TAN
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
3/4 BATCH
BATCH COMMON
RIGHT SW.
WHI
START SW.
WHI/VIO
LEFT SW.
WHI
START SW.
WHI/RED
1
LEFT 2
BREW 3
TIMER
4
5
WHI/RED
ORA
WHI/BRN
YEL
WATER
BYPASS
WHI/VIO
SOL
SOL
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
WHI
WHI
OPTIONAL
RECOVERY BOOSTER
WHI/RED
WHI/GRN
K3
WHI/BRN
WHI/RED
120/208 VOLTS AC OR
120/240 VOLTS AC
3 WIRE
27040 062200
Page 45
SCHEMATIC WIRING DIAGRAM DUAL-A & -B BREWER
(W/TWO-GRINDER INTERFACE)
L1
L2
GRN/YEL
LIMIT THERMOSTAT
BLK-12
BLK-12
K1
N.O.
BLK-12
RED-12
TANK HEATERS (TWO)
BLK-12
RED-12
RED-12
K1
N.O.
READY INDICATORS
OVERFLOW
PROTECTION SW
BLK
RED
SW. & THERMOSTAT
RED
BLU
RED
K1
OPTIONAL
RECOVERY BOOSTER
BLU
RED
K2 N.O.
LIQUID 1
LEVEL 2
BOARD 3
BLK
K3 N.O.
4
VIO
BLU
SOL
RED
RED
PIN-20
PROBE
BLK
OPTIONAL 3-SET SELECTOR SWITCHES SHOWN
WITH TWO-GRINDER INTERFACE OPTION
TAN
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
3/4 BATCH
BATCH COMMON
WHI/VIO
S
E
L
E
C
T
O
R
S
W
RED
WHI/ORA
WHI/GRN
WHI/YEL
4
5
SOL
OPTIONAL
RECOVERY BOOSTER
WHI/VIO
WHI/GRN
SOL
K2
WHI/GRN
WHI/RED
4
GRY 3 GRINDER
PNK 2 INTERFACE
CONNECTOR
TAN 1
S
W
S
E
L
E
C
T
O
R
WHI/VIO
WATER
BYPASS
R
T
L
T
1
RIGHT 2
BREW
3
TIMER
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
WHI/VIO
RED
4
GRY 3 GRINDER
PNK 2 INTERFACE
CONNECTOR
TAN 1
TAN
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
3/4 BATCH
BATCH COMMON
RIGHT SW.
RED
START SW.
WHI/VIO
LEFT SW.
RED
START SW.
WHI/RED
1
LEFT 2
BREW
3
TIMER
4
5
RED
ORA
WHI/BRN
YEL
WATER
BYPASS
WHI/VIO
SOL
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
WHI/RED
RED
SOL
OPTIONAL
RECOVERY BOOSTER
WHI/RED
WHI/GRN
K3
WHI/BRN
WHI/RED
200 OR 240 VOLTS AC
2 WIRE
27040 062200
Page 46
SCHEMATIC WIRING DIAGRAM DUAL BREWER ECA
(W/TWO-GRINDER INTERFACE)
GRN
L1
L2
N
OPTIONAL RECOVERY BOOSTER
BLK-12
LIMIT
THERMOSTAT
TANK HEATERS (TWO)
W
H
I
PNK
READY
L.E.D.
K1 N.O.
BLU-12
BLK-12
BLK-12
GRY
OVERFLOW
PROTECTION SW
RED
RED
BLK
BLK
BLU-12
BLU-12
W
t° H
I
TANK HEATER
SW
PNK
GRY
GRY
INTERLOCK
GRY
ASSY
BRN/BLK
RED/BLK
ORA
WHI/ORA
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
3/4 BATCH
BATCH COMMON
7
6
PIN 20
(PROBE)
5
4
ELECTRONIC 3
CONTROL 2
1
ASSY
RED
BLK
GRN
WHI/VIO
S
E
L
E
C
T
O
R
S
W
WHI/VIO
WHI
WHI/ORA
WHI/GRN
WHI/YEL
SOL
OPTIONAL
RECOVERY BOOSTER
4
GRY 3 GRINDER
PNK 2 INTERFACE
CONNECTOR
TAN 1
TAN
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
WHI/VIO
3/4 BATCH
BATCH COMMON
RIGHT SW.
K2
WHI/GRN
WHI/RED
START SW.
WHI
WHI/VIO
LEFT SW.
WHI
START SW.
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
WHI/RED
WHI
WHI/RED
1
LEFT 2
BREW 3
TIMER
4
5
WHI
ORA
WHI/BRN
YEL
SOL
OPTIONAL
RECOVERY BOOSTER
WATER
BYPASS
WHI/VIO
WHI
SOL
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
WHI/VIO
WHI
WHI/GRN
SOL
4
GRY 3 GRINDER
PNK 2 INTERFACE
CONNECTOR
TAN 1
S
W
S
E
L
E
C
T
O
R
4
5
WHI/BLU
WATER
BYPASS
R
T
L
T
1
RIGHT 2
BREW 3
TIMER
WHI-12
TAN
BLU
WHI/BRN
OPTIONAL 3-SET SELECTOR SWITCHES SHOWN
WITH TWO-GRINDER INTERFACE OPTION
TAN
RED-12
BLU-12
SOL
WHI/GRN
WHI/RED
WHI/BRN
K1
GRY
WHI/RED
K2 N.O.
120/208 VOLTS AC OR
120/240 VOLTS AC
3 WIRE
27040 041100
Page 47
SCHEMATIC WIRING DIAGRAM DUAL-A & -B BREWER ECA
(W/TWO-GRINDER INTERFACE)
GRN/YEL
L1
L2
OPTIONAL RECOVERY BOOSTER
LIMIT
THERMOSTAT
BLK-12
BLU-12
BLK-12
TANK HEATERS (TWO)
W
H
I
PNK
GRY
OVERFLOW
PROTECTION SW
RED
RED
BLK
BLK
K1 N.O.
BLU-12
BLK-12
READY
L.E.D.
BLU-12
BLU-12
W
t° H
I
TANK HEATER
SW
PNK
GRY
GRY
INTERLOCK
GRY
ASSY
BRN/BLK
RED/BLK
ORA
WHI/ORA
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
3/4 BATCH
BATCH COMMON
7
6
PIN 20
(PROBE)
5
4
ELECTRONIC 3
CONTROL 2
1
ASSY
RED
BLK
GRN
WHI/BLU
WHI/VIO
S
E
L
E
C
T
O
R
S
W
WHI/VIO
RED
WHI/ORA
WHI/GRN
WHI/YEL
SOL
OPTIONAL
RECOVERY BOOSTER
WHI/VIO
WHI/GRN
SOL
K2
WHI/GRN
WHI/RED
4
GRY 3 GRINDER
PNK 2 INTERFACE
CONNECTOR
TAN 1
S
W
S
E
L
E
C
T
O
R
4
5
RED
SOL
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
WHI/VIO
RED
WATER
BYPASS
R
T
L
T
1
RIGHT 2
BREW
3
TIMER
WHI-12
TAN
BLU
WHI/BRN
OPTIONAL 3-SET SELECTOR SWITCHES SHOWN
WITH TWO-GRINDER INTERFACE OPTION
TAN
RED-12
4
GRY 3 GRINDER
PNK 2 INTERFACE
CONNECTOR
TAN 1
TAN
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
3/4 BATCH
BATCH COMMON
START SW.
RIGHT SW.
RED
WHI/VIO
LEFT SW.
RED
START SW.
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
WHI/RED
RED
WHI/RED
1
LEFT 2
BREW
3
TIMER
4
5
RED
ORA
WHI/BRN
YEL
SOL
OPTIONAL
RECOVERY BOOSTER
WATER
BYPASS
WHI/VIO
WHI/GRN
SOL
WHI/BRN
GRY
K1
WHI/RED
WHI/RED
K2 N.O.
200 OR 240 VOLTS AC
2 WIRE
©
Page 48
O
C CO
O
O
27040 062200
SCHEMATIC WIRING DIAGRAM DUAL BREWER
(W/ONE-GRINDER INTERFACE)
L1
L2 N
GRN
LIMIT THERMOSTAT
BLK-12
RED-12
BLK-12
BLK-12
K1
N.O.
TANK HEATERS (TWO)
BLK-12
RED-12
RED-12
K1
N.O.
READY INDICATORS
OVERFLOW
PROTECTION SW
BLK
RED
SW. & THERMOSTAT
RED
BLU
WHI
K1
OPTIONAL
RECOVERY BOOSTER
BLU
RED
K2 N.O.
LIQUID 1
LEVEL 2
BOARD 3
BLK
K3 N.O.
4
VIO
BLU
WHI
SOL
WHI
PIN-20
PROBE
BLK
OPTIONAL 3-SET SELECTOR SWITCHES SHOWN
WITH ONE-GRINDER INTERFACE OPTION
TAN
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
3/4 BATCH
BATCH COMMON
1
RIGHT 2
BREW
3
TIMER
4
5
WHI/VIO
WHI/VIO
WHI/ORA
WHI/GRN
WHI/YEL
WHI/VIO
S
E
L
E
C
T
O
R
OPTIONAL
RECOVERY BOOSTER
WHI/VIO
WHI/RED
GRINDER INTERFACE
CONNECTOR
GRY
PNK
TAN
GRY
PNK
TAN
S
W
RIGHT SW.
4
3
2
1
GRIND
SELECTOR
SW
GRY
PNK
TAN
WHI
START SW.
WHI/VIO
LEFT SW.
WHI
START SW.
WHI/RED
L
T
S
E
L
E
C
T
O
R
S
W
K2
WHI/GRN
WHI/GRN
SOL
WHI
WHI
SOL
WATER
BYPASS
R
T
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
TAN
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
3/4 BATCH
BATCH COMMON
1
LEFT 2
BREW
3
TIMER
4
5
WHI/RED
ORA
WHI/BRN
YEL
WATER
BYPASS
WHI/VIO
SOL
SOL
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
WHI
WHI
OPTIONAL
RECOVERY BOOSTER
WHI/RED
WHI/GRN
K3
WHI/BRN
WHI/RED
120/208 VOLTS AC OR
120/240 VOLTS AC
3 WIRE
27040 062200
Page 49
SCHEMATIC WIRING DIAGRAM DUAL BREWER ECA
(W/ONE-GRINDER INTERFACE)
GRN
L1
L2
N
OPTIONAL RECOVERY BOOSTER
BLK-12
LIMIT
THERMOSTAT
TANK HEATERS (TWO)
W
H
I
PNK
READY
L.E.D.
K1 N.O.
BLU-12
BLK-12
BLK-12
GRY
OVERFLOW
PROTECTION SW
RED
RED
BLK
BLK
BLU-12
BLU-12
W
t° H
I
TANK HEATER
SW
PNK
GRY
GRY
INTERLOCK
GRY
ASSY
BRN/BLK
RED/BLK
ORA
WHI/ORA
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
1
3/4 BATCH
BATCH COMMON
RIGHT 2
BREW 3
TIMER
4
5
7
6
PIN 20
(PROBE)
5
4
ELECTRONIC 3
CONTROL 2
1
ASSY
RED
BLK
GRN
WHI/VIO
S
E
L
E
C
T
O
R
WHI/VIO
WHI
WHI/ORA
WHI/GRN
WHI/YEL
SOL
OPTIONAL
RECOVERY BOOSTER
GRY
PNK
TAN
GRY
PNK
TAN
WHI/RED
START SW.
WHI/VIO
LEFT SW.
WHI
START SW.
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
WHI/RED
WHI
WHI/RED
S
W
TAN
K2
WHI/GRN
WHI
4
3
2
1
GRIND
SELECTOR
SW
GRY
PNK
TAN
WHI/VIO
RIGHT SW.
WHI
SOL
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
WHI/VIO
WHI
WHI/GRN
SOL
GRINDER INTERFACE
CONNECTOR
S
W
S
E
L
E
C
T
O
R
WHI/BLU
WATER
BYPASS
R
T
L
T
WHI-12
TAN
BLU
WHI/BRN
OPTIONAL 3-SET SELECTOR SWITCHES SHOWN
WITH ONE-GRINDER INTERFACE OPTION
TAN
RED-12
BLU-12
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
3/4 BATCH
BATCH COMMON
1
LEFT 2
BREW 3
TIMER
4
5
WHI
ORA
WHI/BRN
YEL
SOL
OPTIONAL
RECOVERY BOOSTER
WATER
BYPASS
WHI/VIO
SOL
WHI/GRN
WHI/RED
WHI/BRN
K1
GRY
WHI/RED
K2 N.O.
120/208 VOLTS AC OR
120/240 VOLTS AC
3 WIRE
27040 062200
Page 50
SCHEMATIC WIRING DIAGRAM DUAL-A & -B BREWER
(W/ONE-GRINDER INTERFACE)
L1
L2
GRN/YEL
LIMIT THERMOSTAT
BLK-12
BLK-12
BLK-12
K1
N.O.
RED-12
TANK HEATERS (TWO)
BLK-12
RED-12
RED-12
K1
N.O.
READY INDICATORS
OVERFLOW
PROTECTION SW
BLK
RED
SW. & THERMOSTAT
RED
BLU
RED
K1
OPTIONAL
RECOVERY BOOSTER
BLU
RED
K2 N.O.
LIQUID 1
LEVEL 2
BOARD 3
BLK
K3 N.O.
4
VIO
BLU
SOL
RED
RED
PIN-20
PROBE
BLK
OPTIONAL 3-SET SELECTOR SWITCHES SHOWN
WITH ONE-GRINDER INTERFACE OPTION
TAN
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
1
3/4 BATCH
BATCH COMMON
RIGHT 2
BREW 3
TIMER
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
WHI/VIO
RED
WHI/VIO
RED
WHI/ORA
WHI/GRN
WHI/YEL
4
5
SOL
OPTIONAL
RECOVERY BOOSTER
WATER
BYPASS
R
T
WHI/VIO
S
E
L
E
C
T
O
R
WHI/VIO
WHI/GRN
SOL
WHI/RED
GRINDER INTERFACE
CONNECTOR
GRY
PNK
TAN
GRY
PNK
TAN
S
W
RIGHT SW.
4
3
2
1
GRIND
SELECTOR
SW
GRY
PNK
TAN
RED
START SW.
WHI/VIO
LEFT SW.
RED
START SW.
WHI/RED
L
T
S
E
L
E
C
T
O
R
S
W
K2
WHI/GRN
TAN
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
3/4 BATCH
BATCH COMMON
1
LEFT 2
BREW 3
TIMER
4
5
RED
ORA
WHI/BRN
YEL
WATER
BYPASS
WHI/VIO
SOL
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
WHI/RED
RED
SOL
OPTIONAL
RECOVERY BOOSTER
WHI/RED
WHI/GRN
K3
WHI/BRN
WHI/RED
200 OR 240 VOLTS AC
2 WIRE
27040 062200
Page 51
SCHEMATIC WIRING DIAGRAM DUAL-A & -B BREWER ECA
(W/ONE-GRINDER INTERFACE)
GRN/YEL
L1
L2
OPTIONAL RECOVERY BOOSTER
LIMIT
THERMOSTAT
BLK-12
BLU-12
BLK-12
TANK HEATERS (TWO)
W
H
I
PNK
GRY
OVERFLOW
PROTECTION SW
RED
RED
BLK
BLK
K1 N.O.
BLU-12
BLK-12
READY
L.E.D.
BLU-12
BLU-12
W
t° H
I
TANK HEATER
SW
PNK
GRY
GRY
INTERLOCK
GRY
ASSY
BRN/BLK
RED/BLK
ORA
WHI/ORA
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
1
3/4 BATCH
BATCH COMMON
RIGHT 2
BREW
3
TIMER
4
5
7
6
PIN 20
(PROBE)
5
4
ELECTRONIC 3
CONTROL 2
1
ASSY
RED
BLK
GRN
WHI/BLU
WHI/VIO
WHI/VIO
RED
WHI/ORA
WHI/GRN
WHI/YEL
SOL
OPTIONAL
RECOVERY BOOSTER
S
E
L
E
C
T
O
R
WHI/VIO
WHI/GRN
SOL
GRY
PNK
TAN
GRY
PNK
TAN
START SW.
RIGHT SW.
RED
4
3
2
1
GRIND
SELECTOR
SW
GRY
PNK
TAN
WHI/VIO
LEFT SW.
RED
START SW.
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
WHI/RED
RED
WHI/RED
S
W
K2
WHI/GRN
WHI/RED
GRINDER INTERFACE
CONNECTOR
S
W
S
E
L
E
C
T
O
R
RED
SOL
100W WARMER
(NOT AVAILABLE ON
DUAL-TF)
WHI/VIO
RED
WATER
BYPASS
R
T
L
T
WHI-12
TAN
BLU
WHI/BRN
OPTIONAL 3-SET SELECTOR SWITCHES SHOWN
WITH ONE-GRINDER INTERFACE OPTION
TAN
RED-12
TAN
GRY
FRACTIONAL
BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
PNK
3/4 BATCH
BATCH COMMON
1
LEFT 2
BREW
3
TIMER
4
5
RED
ORA
WHI/BRN
YEL
SOL
OPTIONAL
RECOVERY BOOSTER
WATER
BYPASS
WHI/VIO
WHI/GRN
SOL
WHI/BRN
K1
GRY
WHI/RED
WHI/RED
K2 N.O.
200 OR 240 VOLTS AC
2 WIRE
©
Page 52
O
C CO
O
O
27040 062200
SCHEMATIC WIRING DIAGRAM
DUAL BREWER W/DIGITAL BREWER CONTROL
WHI/VIO
120V.A.C.
208 0R 240V.A.C.
120V.A.C.
WHI
BLK
D
I
G
I
T
A
L
J1-1
WHI/RED
WHI/RED
WHI
WHI
WHI
WHI
WHI
OPTIONAL
RT BYPASS
BLK
BLK
BLK
BLK
WHI/GRN
WHI/GRN
WHI
TAN
BLU
C
O
N
T
R
O
L
WHI
SOL
WHI
RT LIMIT T'STAT
BLK
BLK
SOL
RT TANK HEATER BLU
P1
P2
B
O
A
R
D
REFILL
LT BREW
OPTIONAL
LT BYPASS
SOL
SOL
SOL
WHI
LT LIMIT T'STAT
BLK
BLK
RED
WHI/GRN
P1
P2
TRIAC
BLU
WHI/VIO
TAN
GRY
LT START SW
RED
BLK
RT START SW
BLK
BLK
P2
P3
P1
P1
WHI
WHI
RED
P2
BLU
RED
P2
P1
PNK
YEL
PNK
P4
PNK
TAN
ORA
GRY
TAN
GRY
TAN
PNK
WHI/VIO
WHI
TEMP.
SENSOR
WHI
R
I
G
H
T
B
A
T
C
H
WHI/RED
READY
GRY
S
W
I
T
C
H
4
3 GRINDER
INTERFACE
PNK
2 CONNECTOR
TAN
1
GRY
PNK
P4
P2
DRY PLUG
DETECTION
PNK
P3
GRY
GRN
RED
BLK
RED
RED
PNK
WHI
S
E
L
E
C
T
GRY
PNK
VIO
J3-40
BLU
OPTIONAL
DAY/NIGHT
SWITCH
N.C.
BLK
YEL
BLK
RED
PNK
WHI
RED
BLU
LT WARMER
RED
OVERFLOW
PROTECTION SWITCH
PNK
WHI/VIO
TAN
LT TANK HEATER
WHI
BLK
WHI/VIO
TRIAC
BLU
LT ON/OFF SW
WHI/GRN
C
I
R J1-24
C
U J3-1
I
T
BLU
WHI
TAN
BLU
BLK
WHI/BLU
RT WARMER
WHI/RED
WHI/RED
RT BREW
B
R
E
W
E
R
GRN
RT ON/OFF SW
P1
6
5 CONTROL
4 & DISPLAY
3 CONNECTOR
2 INTERFACE
1
LIQUID LEVEL SENSOR
10864.0000H 9/00 © 1995 BUNN-O-MATIC CORPORATION
TAN
VIO
YEL
ORA
WHI/VIO
WHI/GRN
L
E
F
T
B
A
T
C
H
S
E
L
E
C
T
S
W
I
T
C
H
120/208 OR
120/240 VOLTS AC
3 WIRE
SINGLE PHASE
27040 032201
Page 53
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