BUNN DUAL SH
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PN:
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
28222.0000 09/03 ©1997 Bunn-O-Matic Corporation
www.bunnomatic.com
INTRODUCTION
This equipment will brew two 1/2 gallon, 1 gallon and 1-1/2 gallon or 1-3/4 gallon 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 BUNN® 1-1/2 gallon or 1-3/4 gallon soft heat servers.
It is only for indoor use on a sturdy counter os 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.
BUNN, Dual and Soft Heat are trademarks or registered trademarks of Bunn-O-Matic Corporation.
USER NOTICES
The notices on this brewer should be kept in good condition. Replace unreadable or damaged labels.
! WARNING
HOT WATER
20201.5600
00656.0000
Page 2
28222 091603
USER NOTICES
00658.0000
00831.0000
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, 230 or 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.
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. 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.
28222 091603
Page 3
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 or female quick connect.
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 or quick disconnect 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.
1. Remove the front panel beneath the sprayhead. Rotate the control thermostat knob fully counterclockwise to
the “OFF” position.
2. Connect the brewer to the power source. Water will begin flowing into the tank.
3. When water stops flowing into the tank, rotate the control thermostat knob fully clockwise to the “ON” position
and replace the front panel.
4. Wait approximately twenty minutes for the water in the tank to heat to the proper temperature.
5. Place an empty server beneath either of the brew stations. Place its associated Selector switch in the desired
position, the On/Off switch in the upper position and initiate a brew cycle.
6. Place the On/Off switch in the lower “OFF” position after water has stopped flowing from the funnel, and check
the water volume in the server. It should be 64 oz (1/2 gallon), 128 oz (1 gallon), 196 oz (1-1/2 gallon) 224
oz (1-3/4 gallon) or adjust volume to your company specifications.
7. (A) If not, adjust the timer for that brew station as required. Refer to Adjusting Brew Volumes.
(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 of 1
gallon 1-1/2 gallon or 1-3/4 gallon.
8. Repeat step 7 until the proper water volume is achieved.
9. Repeat steps 5 through 8 for the other 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.
Page 4
28222 071700
ADJUSTING BREW VOLUMES (Cont,)
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
Placing the switch in the 1/2 Gal, 1 Gal, 1-1/2 Gal or 1-3/4 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 timer 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 timer 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 to the grinder interface.
NOTE – The On/Off switch must be in the lighted upper position to initiate and complete a brew cycle.
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.
28222 071700
Page 5
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.
Page 6
28222 050900
TROUBLESHOOTING (cont.)
Problem
Brew cycle will not start (cont.)
Automatic refill will not operate
Probable Cause
3. ON/OFF switch
Remedy
Refer to Service - ON/OFF switch for
testing procedures. See page 22
4. Start switch
Refer to Service - Start switch for
testing procedures. See page 30
5. Timer
Refer to Service - Timer for testing
procedures. See page 32 or 34
6. Dispense valve
Refer to Service - Dispense valve for
testing procedures. See page 18
7. Brew selector switch
Refer to Service - Brew selector
switch for testing procedures. See
page 14
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.
Beverage level will not adjust
(Selector switch in any position)
3. Solenoid valve
Refer to Service - Solenoid valve for
testing procedures. See page 29
4. Overflow protection switch
Refer to Service - Overflow protection switch for testing procedures.
See page 23
5. Level control board & level
probe.
Refer to Service - Level control board
for testing procedures. See page 20
1. Brew Selector switch
Refer to Service - Selector switch for
testing procedures. See page 14
Page 7
28222 062200
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Water flows into tank continuously
.
1. Solenoid valve
Refer to Service - Solenoid valve for
testing procedures. See page 29
2. Level control board and level
probe
Refer to Service - Level control board
for test procedures. See page 20
3. Overflow protection switch
Refer to Service - Overflow protection switch for testing procedures.
See page 23
Water flows into tank continuously
(ON/OFF switch "ON").
1. Timer
Refer to Service - Timer for testing
procedures. See page 32 or 34
Water from tank is not hot
1. Limit thermostat
CAUTION - Do not eliminate or bypass limit thermostat. Use only
B.O.M. part #23717.0001
Refer to Service -Limit thermostat
for testing procedures. See page 21
2. Control Thermostat
Refer to Service - Control Thermostat for testing procedures. See page
17
3. Contactor (Brewers with Recovery booster)
Refer to Service - Contactor for testing procedures. See page 16
4. Tank heaters
Refer to Service - Tank heaters for
testing procedures. See page 31
5. Relay (Brewers with Recovery
Booster)
Refer to Service - Relay for testing
procedures. See page 25
Page 8
28222 062200
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Spitting or unusual steaming from
sprayhead or airvents.
1. Control thermostat
Refer to Service - Control thermostat for testing procedures. See page
17
2. Lime build-up
Inspect the tank assembly for excessive lime deposits. Delime as required.
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.
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 the operating water pressure
to the brewer. It must be between 20
and 90 psi.
3. Dispense valve
Refer to Service - Dispense valve for
testing procedures. See page 18
4. Bypass valve
Refer to Initial Set-Up on page 4 step
#7. For test procedure see page 13.
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 18
Water overflows server.
1. Bypass valve
Refer to Initial Set -Up on page 4 step
#7. For test procedures see page 13.
2. Needle valve
Refer to Initial Set-Up on Page 4 step
#7.
Page 9
28222 050900
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Water overflows filter (cont.)
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 32 or 34
3. Dispense valve
Refer to Service - Dispense valve for
testing procedures. See page 18
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.
3. Sprayhead
B.O.M. Sprayhead #01082.0002
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.
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.
Page 10
28222 062200
Beverage overflows server.
Weak beverage
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Brewer is making unusual noises.
1. Solenoid valve
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.
(B) Water pressure to the brewer
must not be higher than 90 psi.
Install a regulator if necessary to
lower the working pressure to approximately 50 psi.
Server will not heat
4. Tank heaters
Remove and clean lime off tank heaters.
5. Contactor
Check for low voltage
1. Circuit breaker
A) Check and reset if necessary
B) Refer to Service - Circuit breaker
for test procedures. See page 15
2. Receptacle Contacts
Clean or replace. See page 24
3. Relay (Server Power) (Prior to
S.N. DUAL026000)
Refer to Service - Relay (Soft Heat)
for test procedures. See page 27
4. Transformer
Refer to Service - Transformer for
test procedures. See page 36
5. Rectifier
Refer to Service - Rectifier for test
procedures. See page 24
Page 11
28222 062200
SERVICE
This section provides procedures for testing and
replacing various major components used in this
brewer should service become necessary. Refer to
Troubleshooting for assistance in determining the
cause of any problem.
WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified
service personnel. The brewer should be unplugged
when servicing, except when electrical tests are required and the test procedure specifically states to
plug in the brewer.
COMPONENT ACCESS
WARNING - Unplug the brewer before the removal of
any panel or the replacement of any component.
D
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All components are accessible by the removal of
the top cover, front inspection panel and server
platform.
The top cover is attached with four #4-40 slotted
head screws.
The front inspection panel is attached with eleven
#6-32 slotted head screws.
The sever platform is attached with four #6-32
slotted head screws.
Contents
Brew Selector Switches ........................................ 14
Bypass Valves ....................................................... 13
Circuit Breakers .................................................... 15
Contactor Assembly.............................................. 16
Control Thermostat ............................................... 17
Dispense Valves.................................................... 18
Grinder Selector Switch ........................................ 19
Level Control Board and Level Probe .................... 20
Limit Thermostat .................................................. 21
ON/OFF Switches .................................................. 22
Overflow Protection Switch .................................. 23
Receptacles (Spring Contacts) ............................. 24
Rectifiers .............................................................. 24
Relays (Recovery Boost) ...................................... 25
Relays (Server Power) .......................................... 27
Solenoid ............................................................... 29
Start Switches ...................................................... 30
Tank Heaters ......................................................... 31
Timers ............................................................. 32,34
Transformer .......................................................... 36
Wiring Diagrams ............................................. 38-41
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658
PN:
FIG. 1 COMPONENT ACCESS
P1361
Page 12
28222 062200
If voltage is not present as described refer to the wiring
diagrams and check the brewer wiring harness.
SERVICE (cont.)
BYPASS VALVE
5. Check for continuity across the bypass valve coil
terminals.
1 1⁄2
If continuity is present as described, reconnect the
white/green and white/violet wires to the bypass valve
and proceed to #6.
If continuity is not present as described, replace the
bypass valve.
gal
1 gal
1⁄2
gal
RE
SE
ON
5
IC
AT
-M
-O
4
NN
BU
2
2
2.5
1.5
3
4
6
ST
7
.5
5
IC
AT
-M
-O
4
NN
3
1
6
AD
Y
OR
6. Check the bypass valve for coil action. Connect
brewer to the power source. With the "ON/OFF"
switch in the "ON" position press the start switch.
Listen carefully in the vicinity of the by-pass valve
for a "clicking" sound as the coil attracts and repels
the plunger.
T
8
1
ES
UT
MIN
1 1⁄2
ES
UT
C
IN
. M
ES 0 VA
UT AT
12IC
MIN 00
ES
-M VAC
-O
UT
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MIN
48NN - 12
BU
24
20
P/N N 26
P/
gal
1 gal
1⁄2
gal
ST
7
3
ON
/W
AR
AR
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8
5
2
6
1
2
2
.
ES UTES
UT INIC
2.5
1.5
MIN -MMATVAC
-O 0
1
NN - 12
ES
BU
UT
20
C
3
MIN N 26
0 VA
P/
12
ES
00
UT
6-00
MIN
48
24
P/N
SE
RE
AD
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CT
OR
Y
If the sound is heard as described, there may be a
blockage in the water line before the bypass valve or
the bypass valve may require inspection for wear and
removal of waterborne particles.
If the sound is not heard as described, replace the
bypass valve.
1 2 3 4 5
6
BUNN
1 2 3 4 5
6
.500 gpm FLOW
90 psig max operating pressure
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
(Repl. Screen #23721.0000)
.5
4
CT
2
6
3
BU
/
LE
MER
3
5
1
1
AR
WAR
FIG. 2 BYPASS VALVE
P973
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 1.5 or 1.75 gallon server under the funnel.
2. Disconnect the white/green wire and the white/
violet wire on the bypass valve.
3. Check the voltage across the white/green and the
white/violet wires with a voltmeter. Connect the
brewer to the power source. With the "ON/OFF"
switch in the "ON" position, the selector switch in
the 1.5 or 1.75 gallon position 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.
b.) 200 to 240 volts ac for two wire 200, 230 or
240 volt models.
4. 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 level
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. 3 when reconnecting the wires.
WHI/GRN to Dispense Valve
WHI/VIO to Brew Selector Switch
LEFT AND RIGHT VALVE
FIG. 3 BYPASS VALVE TERMINALS
If voltage is present as described, proceed to #5.
Page 13
P774
28222 081597
8. Disconnect the pink wire on the selector switch
from the grinder switch.
9. Check for continuity across the pink wire and tan
wire on the selector switch when the switch is in
the 1/2 gallon position. Continuity must not be
present in any other position.
10. Check for continuity across the pink wire and gray
wire on the selector switch when the switch is in
the 1 gallon position. Continuity must not be
present in any other position.
11. Reconnect the gray and tan wire on the selector
switch to the gray and tan wires on the interface
socket.
12. Reconnect the pink wire on the selector switch to
the grinder switch.
SERVICE (cont.)
BREW SELECTOR SWITCH
!
W
A
R
N
IN
G
CE
UR OR T!
SO NEL EN
WERY PA ON
PO AN COMP
OM OF Y
FR L AN
CT VA
T OF
NE MO
EN
ONRE RE
EM
DISCFOPLAC
BERE
HO
!
!
CA
UT
IO
T WA
TE
R
N
ER
N
IO CANT
UT RD DE
CA DISCA
IF:
D
Y
KE D
PT
AC HEY
. CRRATCDR EN EM ME
IC
D
. SC ILE WH H FLATR
EC
. BOATED HIG EL
ON D
SE
. HEED
PO
Y
. US EX TS
UR
N
. OREMEN INJ
ATIO
TS
EL
POR
KS
EN
COR
RIS
NT
TIC
LY
CO T
-MA
N-O
MP
EL HO
CO
NN E
5 BUN
198
FU AR
TO
RE
ILU
FA
658
PN:
P1361
FIG. 4 BREW SELECTOR SWITCH
Location:
The brew selector switches are located in the
front left and right side of the hood.
Test Procedure:
Timer: Left or Right
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.
Bypass Valve: Left or Right
13. Disconnect the white/violet on the selector switch
from the bypass valve coil and disconnect the
white/red from the dispense valve coil.
14. Check for continuity across the white/violet and
the white/red wires when the selector is in the 1
gallon, 1-1/2 gallon or 1-3/4 gallon position.
Continuity must not be present in any other position.
15. Reconnect the white/violet to the bypass valve coil
and white/red to the dispense valve coil.
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 points to the 11/2 or 1-3/4 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. 5 when reconnecting the wires.
Grinder Interface: Left or Right:
7. Disconnect the gray and tan wires on the selector
switch from the gray and tan wires on the interface
socket.
Page 14
28222 081597
SERVICE (cont.)
Test Procedures:
BREW SELECTOR SWITCH (cont.)
1. Disconnect the dispenser from the power source.
2. Remove the wires from the circuit breaker.
3. Check for continuity between the terminals. Continuity must be present between the terminals.
WHI/VIO to Left or Right
By-Pass Valve
To Left or Right Timer
If continuity is present as described the circuit breaker
is functioning properly.
If continuity is not present as described, press reset
button and repeat step #3, if continuity is not present
as described, replace the circuit breaker.
TAN
WHI/RED to Left or Right
Dispense Valve
GRY
GRY To Left or Right Selector Switch
to GRY Lead on Interface Socket
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
P776
FIG. 5 BREW SELECTOR SWITCH TERMINALS
CIRCUIT BREAKERS
Removal and Replacement:
1. Remove the wires from the circuit breaker.
2. Compress the clips on the back side of the server
platform and gently push the circuit breaker through
the opening in the server platform.
3. Push the new circuit breaker into the opening in
the server platform until the clips snap into position.
4. Reconnect the wires to the circuit breaker.
5. Refer to Fig. 7 when reconnecting the wires.
BLU/BLK
to Transformer
RED
from Transformer
#12
R
TE
T WA
HO
!
!
ION
UT
CA
ER
ON CANT
UTI RD DE
CA DISCA
IF:
D
CKEHED
PTY
. CRAATC
DRYEN EM ME
D
. SCR
ILE WH H FLA IC
CTR
. BO TED HIG
ELE
. HEAD ON D
Y
OSE UR
N
. USEEXP
ATIO
NTSINJ
TS
. OR MEKS
POR
EN
COR
ELE
RIS
NT
IC
LY
CO T
MAT
N-OMP
EL
BUN
CO
NN E HO
1985
FU AR
TO
RE
ILU
FA
658
PN:
RED
from Main
Harness "AC"
BLU/BLK
to Rectifier
FIG. 7 CIRCUIT BREAKER TERMINALS
FIG. 6 CIRCUIT BREAKERS
P1330
P1361
Location
The circuit breakers are located on the lower front
of the brewer, mounted on the server platform just
above the spring contact receptacle assembly.
Page 15
28222 081597
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 200,230 or
240 volt models.
5. Disconnect the brewer from the power source.
SERVICE (cont.)
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
SE
ON
5
IC
AT
-M
-O
4
NN
BU
2
1.5
2
2.5
3
4
6
ST
7
4
BU
ES
UT
MIN
1 1⁄2
ES
UT
C
IN
3
. M
ES 0 VA
UT AT
12IC
MIN 00
ES
-M VAC
-O
UT
6-00 0
MIN
48NN - 12
BU
24
20
P/N N 26
P/
T
gal
1 gal
1⁄2
gal
ST
7
3
4
6. Check for continuity between the two black wires
of the contactor coil.
Y
8
1
ON
/W
AR
AR
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.
T
MER
8
5
2
.
2.5
SE
RE
AD
LE
CT
OR
Y
1
2
3 4 5
6
1
BUNN
2 3 4 5
6
.500 gpm FLOW
90 psig max operating pressure
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
(Repl. Screen #23721.0000)
.5
2
AR
AD
OR
2
6
6 1
ES UTES
UT INIC
MIN -MMATVAC
-O 0
1
NN - 12
ES
BU
UT
20
C
3
MIN N 26
0 VA
P/
12
ES
00
UT
6-00
MIN
48
24
P/N
2
1.5
1
3
6
/W
CT
3
5
1
1
.5
5
IC
AT
-M
-O
NN
AR
LE
MER
FIG. 8 CONTACTOR ASSEMBLY
P973
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 from
the black wire of the contactor coil and 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. Adjust the thermostat clockwise to the "FULL ON"
position, and 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, 230 or 240 volt units and the black wire from
the control thermostat. Connect the brewer to the
7. Locate the red wire on the L1 terminal and black
wire on the L2 terminal on the contactor.
8. Carefully check the voltage across the red and
black with a voltmeter. 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, 230 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 the 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.
28222 081597
Page 16
SERVICE (cont.)
CONTACTOR ASSEMBLY (cont.)
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. 9 when reconnecting the wires.
BLK T2 to Left Tank Heater
BLK T2 to Right Tank Heater
RED L1 to Terminal Block
(Red Insert)
RED T1 to Left Tank Heater
RED T1 to Right Tank Heater
BLK L2 to Terminal Block
(Black Insert)
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the
wiring diagrams and check the brewer wiring harness.
BLK to White 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 to BLK Lead from Thermostat
MECHANICAL THERMOSTAT W/RECOVERY BOOSTER
P778
FIG. 9 CONTACTOR ASSEMBLY TERMINALS
CONTROL THERMOSTAT
1 1⁄2
gal
1 gal
1⁄2
gal
RE
SE
ON
5
IC
AT
-M
-O
4
NN
BU
2
1.5
2
2.5
3
4
6
ST
7
4
BU
1
AR
CT
AD
Y
OR
T
8
1
ES
UT
MIN
1 1⁄2
ES
C
INUT
3
. M
ES 0 VA
UT AT
12IC
MIN 00
ES
-M VAC
-O
UT
6-00 0
MIN
48NN - 12
BU
24
20
P/N N 26
P/
gal
1 gal
1⁄2
gal
ST
7
ON
/W
AR
ME
AR
T
R
8
5
2
6 1
2
2
.
ES UTES
UT INIC
2.5
1.5
MIN -MMATVAC
-O 0
1
NN - 12
ES
BU
UT
20
C
3
MIN N 26
0 VA
P/
12
ES
00
UT
6-00
MIN
48
24
P/N
SE
RE
AD
LE
CT
OR
Y
1 2 3 4 5
6
BUNN
1 2 3 4 5
6
.500 gpm FLOW
90 psig max operating pressure
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
(Repl. Screen #23721.0000)
.5
3
6
/W
LE
R
2
6
3
4
AR
ME
3
5
1
1
.5
5
IC
AT
-M
-O
NN
Test Procedures
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
or 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.
b.) 200 to 240 volts ac for two wire 200, 230 or
240 volt models.
4. Disconnect the brewer from the power source.
FIG. 10 CONTROL THERMOSTAT
Location:
The control thermostat is located inside the
lower left front of the brewer on the component
bracket.
P973
5. Locate the black wires from the control thermostat.
6. Gently remove the capillary bulb and grommet
from the tank.
7. 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 or
the red insert on two pole 200V, 240V terminal
blocks with a voltmeter 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, 230 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.
Removal and Replacement:
1. Remove wires from the control thermostat.
Page 17
28222 081597
DISPENSE VALVE
SERVICE (cont.)
CONTROL THERMOSTAT (cont.)
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.
1 1⁄2
gal
RE
SE
ON
5
IC
4
AT
1.5
2
2.5
3
6
ST
7
-M
-O
NN
BU
2
4
NN
BU
1
2
1
ES
UT
MIN
1 1⁄2
ES
C
INUT
3
. M
ES 0 VA
UT AT
12IC
MIN 00
ES
-M VAC
-O
UT
6-00 0
MIN
48NN - 12
BU
24
20
P/N N 26
P/
4
ME
Y
T
gal
1 gal
1⁄2
gal
ST
7
3
ON
/W
AR
ME
AR
T
R
8
5
3
AR
AD
OR
2
6
2
6 1
ES UTES
UT INIC
MIN -MMATVAC
-O 0
1
NN - 12
ES
BU
UT
20
C
3
MIN N 26
0 VA
P/
12
ES
00
UT
6-00
MIN
48
24
P/N
2
1.5
.5
6
/W
CT
8
5
1
1
.5
5
IC
AT
-M
-O
AR
LE
R
3
4
.
2.5
SE
RE
AD
LE
CT
OR
Y
FIG. 12 DISPENSE VALVE
P973
1 2 3 4 5
6
Location:
Dispense valves are located inside the hood in
the center of each sprayhead panel.
1 2 3 4 5
6
NOTE - The capillary tube must be clear of any electrical termination and not kinked.
gal
1 gal
1⁄2
7. Using a #8-32 slotted head screw fasten the control thermostat to the component bracket.
8. Refer to Fig. 11 when reconnecting the wires.
9. Adjust the control thermostat as required.
BLU to Overflow Protection Switch
BLU to Ready Light
BLK to Contactor
BLK to Ready Light
P1382
FIG. 11 CONTROL THERMOSTAT TERMINALS
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, 230 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, 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, 230 or
240 volt models.
5. Disconnect brewer from power source.
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 the brewer wiring harness.
Page 18
28222 081597
SERVICE (cont.)
DISPENSE VALVE (cont.)
GRINDER SELECTOR SWITCH
D
B IS
!
R EFOCO
E
W
P R NN
LA E E
A
C R CT
R
E E
N
M M FR
E O O
IN
N V
T A M
G
O L P
F O O
A F W
N A E
Y N R
C Y S
O PA O
M N U
P E R
O L C
N O E
E R
N
T!
6. Check for continuity across the dispense valve coil
terminals.
If continuity is present as described, reconnect the
wires to the dispense valve(s) and proceed to #7
If continuity is not present as described, replace the
dispense valve.
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.
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. Drain enough water from the tank so the dispense
valves are above the water level.
2. Disconnect wires and water tubes from dispense
valve.
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. 13 when reconnecting wires.
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
R
TE
T WA
HO
!
!
ION
UT
CA
ER
ON CANT
UTI RD DE
CA DISCA
IF:
D
CKEHED
PTY
. CRAATC
DRYEN EM ME
D
. SCR
ILE WH H FLA IC
CTR
. BO TED HIG
ELE
. HEAD ON D
Y
OSE UR
N
. USEEXP
ATIO
NTSINJ
TS
. OR MEKS
POR
EN
COR
ELE
RIS
NT
IC
LY
CO T
MAT
N-OMP
EL
BUN
CO
NN E HO
1985
FU AR
TO
RE
ILU
FA
658
PN:
FIG. 14 GRINDER SELECTOR SWITCH
P1361
Location:
The grinder selector switch is located in the upper
center on the front of the hood.
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.
If continuity is present as described, reconnect the
wires, the switch is operating properly.
If continuity is not present as described, replace the
switch.
11. Refer to Fig. 15 when reconnecting the wires.
LEFT
FIG. 13 DISPENSE VALVE TERMINALS
P782
Page 19
28222 081597
SERVICE (cont.)
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, 230 or
240 volt models.
4. Disconnect the brewer from the power source.
GRINDER SELECTOR SWITCH (cont.)
PNK to PNK Lead from
Right Brew Selector Switch
PNK to PNK Lead from Interface Socket
PNK to PNK Lead from
Left Brew Selector Switch
P787
FIG. 15 GRINDER SELECTOR SWITCH
TERMINALS
LEVEL CONTROL BOARD AND LEVEL PROBE
1 1⁄2
gal
1 gal
1⁄2
gal
RE
SE
ON
5
IC
AT
-M
-O
4
NN
BU
2
1.5
2
2.5
3
4
6
ST
7
4
BU
1
2
Y
T
8
1
ES
UT
MIN
1 1⁄2
ES
UT
C
IN
3
. M
ES 0 VA
UT AT
12IC
MIN 00
ES
-M VAC
-O
UT
6-00 0
MIN
48NN - 12
BU
24
20
P/N N 26
P/
gal
1 gal
1⁄2
gal
ST
7
3
4
AR
AD
OR
2
6
ON
/W
AR
AR
T
MER
8
5
2
6 1
ES UTES
UT INIC
MIN -MMATVAC
-O 0
1
NN - 12
ES
BU
UT
20
C
3
MIN N 26
0 VA
P/
12
ES
00
UT
6-00
MIN
48
24
P/N
2
1.5
.
2.5
SE
RE
AD
LE
CT
OR
Y
1
2
3
4
5
6
1
2
3
BUNN
4
5
6
.500 gpm FLOW
90 psig max operating pressure
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
(Repl. Screen #23721.0000)
.5
3
6
/W
CT
3
5
1
1
.5
5
IC
AT
-M
-O
NN
AR
LE
MER
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the
wiring diagrams and check the brewer wiring harness.
5. 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, 230 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, 230 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.
P973
FIG. 16 LEVEL CONTROL BOARD AND
LEVEL PROBE
Location:
The level control board is located inside the front
of the brewer just left of center on the component
bracket
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
Test Procedure:
for corrosion. Replace it if necessary.
1. Disconnect the brewer from the power source.
13. Place the probe so that neither end is in contact
2. Remove the violet wire from terminal 1 & the pink
with any metal surface of the brewer.
wire from terminal 4 of the circuit board.
14. With a voltmeter check the voltage across terminals 1 & 3. Connect the brewer to the power
28222 081597
Page 20
SERVICE (cont.)
LIMIT THERMOSTAT
LEVEL CONTROL BOARD AND LEVEL PROBE
(cont.)
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 for continuity.
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.
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)
1 1⁄2
gal
1 gal
1⁄2
gal
RE
SE
ON
5
IC
AT
-M
-O
4
NN
BU
5
3
2
ST
7
AR
/W
AR
1
.5
T
8
ES
UT
P973
C
MIN
0 VA
12
ES
00
UT
MIN
5
IC
4
-O
NN
2
24
7
-M
BU
6-00
48
P/N
6
Y
ES
UT
MIN
FIG. 18 LIMIT THERMOSTAT
AT
AD
OR
3
1
2.5
1
3
6
CT
2
6
2
1.5
4
LE
MER
3
4
8
5
3
2
1
6
2
ES
Location:
The limit thermostat is located inside the hood on
the tank lid just to the left of the right tank heater.
UT
MIN
2.5
1.5
1
ES
1
UT
0 VA
12
ES
00
UT
MIN
C
MIN
3
.5
6-00
48
P/N
24
2
3
4
5
6
1
2
3
4
5
6
Test Procedure:
1. Disconnect the brewer from the power supply.
2. Disconnect the black wires from the limit thermostat.
3. Check continuity across the limit thermostat terminals with an ohm meter
1
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, 230 or
240 volt models after a delay of approximately
1 second.
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 after a
delay of approximately 1 second.
b.) 200 to 240 volts ac for two wire 200, 230 or
240 volt models after a delay of approximately
1 second.
17. Disconnect the brewer from the power source.
If continuity is present as described, reconnect the
black wires to the limit thermostat, the limit thermostat is operating properly.
If continuity is not present as described, press the
reset button on the limit thermostat and repeat step
#3. After repeating step #3 no continuity is shown,
replace the limit thermostat.
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.
BLK to Terminal
Block (Black
Insert)
T2 BLU to Overflow Protection Switch
T1 VIO to Solenoid Coil
BLK to Contactor
Terminal
FIG 19 LIMIT THERMOSTAT TERMINALS
P789
P791
FIG. 17 LEVEL CONTROL BOARD TERMINALS
Page 21
28222 081597
SERVICE (cont.)
Continuity must not be present when switch is in
the "OFF" position.
ON/OFF SWITCH
D
B IS
!
R EFOCO
E
W
P R NN
LA E E
A
C R CT
R
E E
N
M M FR
E O O
IN
N V
T A M
G
O L P
F O O
A F W
N A E
Y N R
C Y S
O PA O
M N U
P E R
O L C
N O E
E R
N
T!
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.
R
TE
T WA
HO
!
!
ION
UT
CA
ER
ON CANT
UTI RD DE
CA DISCA
IF:
D
CKEHED
PTY
. CRAATC
DRYEN EM ME
D
. SCR
ILE WH H FLA IC
CTR
. BO TED HIG
ELE
. HEAD ON D
Y
OSE UR
N
. USEEXP
ATIO
NTSINJ
TS
. OR MEKS
POR
EN
COR
ELE
RIS
NT
IC
LY
CO T
MAT
N-OMP
EL
BUN
CO
NN E HO
1985
FU AR
TO
RE
ILU
FA
658
PN:
FIG. 20 ON/OFF SWITCH
P1361
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, 230 or
240 volt models.
4. Disconnect the brewer from the power source.
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.
With Relay (Prior to S.N. DUAL026000)
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.
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.
6. Check for continuity across the center and lower
left terminal with switch in the "ON" position.
WHI to Terminal
Block (White Insert
on 120/208V
or 120/240V Models)
RED to Terminal
Block (Red Insert on
200V or 240V Models)
BLK to Terminal
Block (Black
Insert)
WHI/RED to Left
Timer TL1
LEFT
WHI to Terminal
Block ( White Insert
on 120/208V
or 120/240V Models)
RED to Terminal
Block (Red Insert on
200V or 240V Models)
BLK to Terminal
Block (Black
Insert)
WHI/VIO to Right
Timer TL1
RIGHT
P793
Without Relay (After S.N. DUAL026000)
WHI to Terminal Block
WHI to Terminal
(White
Insert on 120/
Block (White
Insert
208V
or 120/240V
on 120/208V
Models)
or 120/240V
Models)
RED
to Terminal
Block
RED to Terminal
(Red
Insert
on 200V or
Block (Red Insert on
240V
Models)
200V or
240V Models)
BLK to Left Start
Switch and
BLKBLK
to to
Terminal
Terminal
Block
(Black
Block
(Black
Insert)
Insert)
WHI/REDtotoLeft
Left
WHI/RED
Timer TL1
Timer
TL1
LEFT
WHI to Terminal
WHI to
Terminal
Block
(White
Insert
( White or
Insert
onBlock
120/208V
on 120/208V
120/240V
Models)
or 120/240V
Models)
RED
to Terminal
RED to Terminal
Block (Red Insert on
Block (Red Insert on
200V
200Vor
or240V
240V Models)
Models)
BLK to Right Start
Switch and BLK to
Terminal
BLK to Block
Terminal
BlockInsert)
(Black
(Black
Insert)
WHI/VIO
Right
WHI/VIO
totoRight
Timer TL1
Timer TL1
RIGHT
FIG. 21 ON/OFF SWITCH TERMINALS
Page 22
28222 101699
SERVICE (cont.)
Removal and Replacement:
1. Disconnect the red leads from the overflow protection switch from the blue wire from the thermostat 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.
OVERFLOW PROTECTION SWITCH
1 1⁄2
gal
1 gal
1⁄2
gal
RE
SE
ON
5
IC
AT
-M
-O
4
NN
BU
2
1.5
2
2.5
3
4
6
ST
7
BU
3
4
6
1
CT
AD
Y
OR
T
8
2
6
1
ES
UT
MIN
1 1⁄2
ES
C
INUT
3
. M
ES 0 VA
UT AT
12IC
MIN 00
ES
-M VAC
-O
UT
6-00 0
MIN
48NN - 12
BU
24
20
P/N N 26
P/
gal
1 gal
1⁄2
gal
ST
7
3
ON
/W
AR
AR
T
MER
8
5
2
1
.5
/
LE
MER
3
5
1
1
.5
5
IC
AT
-M
-O
4
NN
AR
WAR
6
2
2
.
ES UTES
UT INIC
2.5
1.5
MIN -MMATVAC
-O 0
1
NN - 12
ES
BU
UT
20
C
3
MIN N 26
0 VA
P/
12
ES
00
UT
6-00
MIN
48
24
P/N
SE
RE
AD
LE
CT
OR
Y
P973
6
FIG. 22 OVERFLOW PROTECTION SWITCH
1
2
3
4
5
6
1
2
3
4
5
Location:
The overflow protection switch is located inside
the hood on the left side of the tank inside the copper
overflow cup.
To test the overflow protection switch, access
will also be needed to the level control board and
terminal block.
RED to BLK Wire from
Terminal Block
RED to BLU Lead
from Thermostat
FIG. 23 OVERFLOW PROTECTION SWITCH
LEADS
P795
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.
3. 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.
If continuity is present as described, reconnect the red
wires to the blue wire from the thermostat and the
black wire from terminal block.
If continuity is not present as described, replace the
overflow protection switch.
Page 23
28222 081597
SERVICE (cont.)
RECEPTACLE ASSEMBLIES
BLK to (-) Terminal on Right Rectifier
D
B IS
!
R EFOCO
E
W
P R NN
LA E E
A
C R CT
R
E E
N
M M FR
E O O
IN
N V
T A M
G
O L P
F O O
A F W
N A E
Y N R
C Y S
O PA O
M N U
P E R
O L C
N O E
E R
N
T!
RED to (+) Terminal on Right Rectifier
RIGHT
BLK to (-) Terminal on Left Rectifier
RED to (+) Terminal on Left Rectifier
R
TE
T WA
HO
!
!
ION
UT
CA
ER
ON CANT
UTI RD DE
CA DISCA
IF:
D
CKEHED
PTY
. CRAATC
DRYEN EM ME
D
. SCR
ILE WH H FLA IC
CTR
. BO TED HIG
ELE
. HEAD ON D
Y
OSE UR
N
. USEEXP
ATIO
NTSINJ
TS
. OR MEKS
POR
EN
COR
ELE
RIS
NT
IC
LY
CO T
MAT
N-OMP
EL
BUN
CO
NN E HO
1985
FU AR
TO
RE
ILU
FA
658
PN:
LEFT
P1380
FIG. 25 RECEPTACLE TERMINALS
RECTIFIERS
1 1⁄2
gal
1 gal
1⁄2
gal
RE
SE
FIG. 24 RECEPTACLE ASSEMBLIES
P1361
ON
5
IC
AT
-M
-O
4
NN
BU
5
3
2
1.5
2
2.5
4
6
ST
7
Location:
The receptacle assemblies are located on the lower
left and right front of the brewer mounted on the server
platform.
3
2
1
6
2
AR
AD
Y
OR
MER
T
3
8
1
ES
UT
MIN
1 1⁄2
ES
C
INUT
3
. M
ES 0 VA
UT AT
12IC
MIN 00
ES
-M VAC
-O
UT
6-00 0
MIN
48NN - 12
BU
24
20
P/N N 26
P/
gal
1 gal
1⁄2
gal
ST
7
3
ON
/W
AR
AR
T
MER
8
2
6
1
ES UTES
UT INIC
MIN -MMATVAC
-O 0
1
NN - 12
ES
BU
UT
20
C
3
MIN N 26
0 VA
P/
12
ES
00
UT
6-00
MIN
48
24
P/N
1.5
.5
4
/W
CT
2
6
1
1
.5
5
IC
AT
-M
-O
4
NN
BU
5
AR
LE
.
2.5
SE
RE
AD
LE
CT
OR
Y
2
1
6
5
4
3
2
1
Removal and Replacement:
1. Disconnect the brewer from the power source.
2. Disconnect the wires from the receptacle assembly.
3. Remove the two #6-32 flat head screws securing
the receptacle to the server platform.
4. Remove and discard receptacle.
5. Install new receptacle in the server platform and
secure two #6-32 flat head screws..
6. Refer to Fig. 25 and reconnect the wires.
3
BUNN
4
5
6
.500 gpm FLOW
90 psig max operating pressure
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
(Repl. Screen #23721.0000)
Test Procedures:
1. Clean or replace spring contacts.
FIG. 26 RECTIFIERS
P973
Location:
The rectifiers are located inside the base housing
on the right side of the base plate just in front of the
transformers.
Page 24
28222 081597
RELAY (Brewers W/Recovery Booster)
SERVICE (cont.)
RECTIFIERS (cont.)
Test Procedures:
1. Disconnect the brewer from the power source;
2. Remove the red wire and the black wire from the
rectifier to be tested.
3. With a voltmeter check the voltage across the (+)
and (-) terminals on the rectifier. Connect the
brewer to the power source. The indication must
be 24 volts dc.
4. Disconnect the brewer from the power source.
1 1⁄2
RE
ON
5
IC
AT
-M
-O
4
NN
BU
5
3
2
2
2.5
4
6
ST
7
IC
AT
-M
-O
4
NN
BU
5
If voltage is present as described, the rectifier is
operating properly.
If voltage is not present as described, refer to the
brewer wiring diagrams and check the brewer wiring
harness.
C
A
+
3
1
6
/W
AR
CT
AD
Y
OR
T
3
8
1
ES
UT
MIN
1 1⁄2
ES
C
INUT
3
. M
ES 0 VA
UT AT
12IC
MIN 00
ES
-M VAC
-O
UT
6-00 0
MIN
48NN - 12
BU
24
20
P/N N 26
P/
gal
1 gal
1⁄2
gal
ST
7
3
ON
/W
AR
AR
T
MER
8
2
6 1
2
2
.
ES UTES
UT INIC
2.5
1.5
MIN -MMATVAC
-O 0
1
NN - 12
ES
BU
UT
20
C
3
MIN N 26
0 VA
P/
12
ES
00
UT
6-00
MIN
48
24
P/N
SE
RE
AD
LE
CT
OR
Y
4
5
6
.5
4
AR
LE
MER
2
6
1
1
.5
5
RED to Right Receptacle Terminal
BLU/BLK to Transformer #7
BLU/BLK to Circuit Breaker
BLK to Left Receptacle Terminal
gal
SE
1.5
P973
2
3
4
5
6
1
2
3
FIG. 28 RECOVERY BOOSTER RELAY
1
Removal and Replacement:
1 Disconnect the wires from the rectifier.
2. Remove the #6-32 truss head screw securing the
rectifier to the brew base plate.
3. Remove the rectifier and discard.
4. Install new rectifier on base plate and secure with
a #6-32 truss head screw.
5. Refer to Fig. 27 when reconnecting the wires.
gal
1 gal
1⁄2
Location:
The relays are located inside the hood, the right
relay is just to the right of the contactor in front of the
tank and the left relay is just left of the component
bracket in front of the tank.
C
A
Test Procedures:
1. Disconnect the brewer from the power source.
2. Locate the black wire on the left relay center
terminal and the blue wire on the right relay center
terminal.
3. Check the voltage across the black and blue wire
with a voltmeter. 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, 230 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 the brewer wiring harness.
FIG. 27 RECTIFIER TERMINALS
P1381
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 from the "A" terminal
Page 25
28222 081597
SERVICE (cont.)
Relay (Brewers W/Recovery Booster) (cont.)
and white/red wire from "B" terminal on the left
relay.
6. Check for continuity across the "A" and "B" terminals of each relay.
If continuity is present as described, reconnect the
white /green wire and white/violet wire to the right
relay or the white/brown and the white /red wire to the
left relay and proceed to #7.
If continuity is not present as described, replace the
relay(s).
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).
Removal and Replacement:
1. Remove all wires from relay terminals.
2. Remove the #6-32 truss head screw securing
relay to the relay mounting bracket.
3. Remove the relay and discard.
4. Securely install the new relay to the mounting
bracket using a #6-32 truss head screw.
5. Refer to Fig. 29 when reconnecting the wires.
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.
5
BLK to BLK Lead on
Contactor Coil
BLK to BLK Lead on
Thermostat
B
BLU to BLU Lead
from Thermostat
BLU to BLU Lead
from Liquid Level Board
5
WHI/RED to Left Dispense Valve
B
WHI/VIO to Right Dispense
Valve
A WHI/GRN to Right Dispense
Valve
A WHI/BRN to Left Dispense
Valve
7
LEFT
7
RED
RIGHT
BREWERS W/RECOVERY BOOSTER
FIG. 29 RECOVERY BOOSTER RELAYS
Page 26
P1378
28222 081597
SERVICE (cont.)
RELAY (SERVER POWER)(Prior to S.N. DUAL026000)
4. Check for continuity across the "A" and "B" terminals of the relay.
If continuity is present as described, reconnect the
white or red wire to terminal "B" and the green wire to
terminal "A" and proceed to #5.
If continuity is not present as described, replace the
relay.
1 1⁄2
gal
1 gal
1⁄2
gal
RE
SE
ON
5
IC
AT
-M
-O
4
NN
BU
2
2
2.5
1.5
3
4
6
ST
7
5
BU
2
1
6
2
ES
UT
MIN
MER
T
1 1⁄2
gal
1 gal
1⁄2
gal
ST
7
3
ON
/W
AR
AR
T
MER
8
5
3
5. Disconnect the yellow wire from terminal 6 and the
orange wire from terminal 9 on the left relay or the
white/yellow from terminal 6 and white/orange
wire from terminal 9 on the right relay.
6. Check for continuity across terminals 6 and 9 of
the relay by manually closing the relay contacts.
Continuity must not be present when the contacts
are released.
Y
8
1
2
6
1
ES UTES
UT INIC
MIN -MMATVAC
-O 0
1
NN - 12
ES
BU
UT
20
C
3
MIN N 26
0 VA
P/
12
ES
00
UT
6-00
MIN
48
24
P/N
1.5
.5
4
AR
AD
OR
2
6
ES
C
INUT
. M
ES 0 VA
UT AT
12IC
MIN 00
ES
-M VAC
-O
UT
6-00 0
MIN
48NN - 12
BU
24
20
P/N N 26
P/
3
IC
AT
-M
-O
4
NN
/W
CT
3
5
1
1
.5
AR
LE
.
2.5
SE
RE
AD
LE
CT
OR
Y
P973
If continuity is present as described, reconnect the
yellow wire to terminal 6 and the orange wire to
terminal 9 for the left relay or the white/yellow wire to
terminal 6 and the white/orange wire to terminal 9 of
the right relay.
NOTE: On brewers with recovery boost, the server
power relays are located just in front of the recovery
boost relays.
7. Disconnect the black wires from terminals 1 and 7
from the left or right relay.
8. Check for continuity across terminals 1 and 7 until
the contacts are manually opened and that continuity returns when the contacts are released.
1
2
3
4
5
6
1
2
3
4
5
6
FIG. 30 SERVER POWER RELAYS
Location:
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.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the white or red wire from terminal "B"
and the green wire from the terminal "A" of the left
or right server power relay coil. Check the voltage
across the white or red wire and the green wire.
Connect the brewer to the source. Place the ON/
OFF switch in the "ON" position, press and hold the
start switch. The indication must be:
a.) 120 volts ac for three wire 102/208 volt models and three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200, 230 or
240 volt models.
3. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #4
If voltage is not present as described , refer to the
wiring diagram and check the brewer wiring harness.
If continuity was present as described, reconnect the
wires to terminals 1 and 7.
If continuity was present as described in steps #6 and
#8 the relay is operating properly.
If continuity is not present as described, replace the
relay.
Removal and Replacement:
1. Remove all the wires from the relay terminals.
2. Remove the #6-32 screw securing the relay to the
relay mounting bracket.
3. Remove and discard relay.
4. Securely install the new relay to the mounting
bracket using a #6-32 screw.
5. Refer to Fig. 31 when reconnecting the wires.
Page 27
28222 101599
SERVICE (cont.)
RELAY (SERVER POWER)(cont.)
6 - YEL to Left Brew Timer TL5
6 - WHI/YEL to Right Brew Timer TL5
9 - ORN to Left Brew Timer TL3
9 - WHI/ORN to Right Brew Timer TL3
B - WHIor RED to Terminal Block
B - WHI or RED to Terminal Block
1 - BLK to Right Transformer (1)
A - GRN to Right Start Switch
1 - BLK to Left Transformer (1)
A - GRN to Left Start Switch
LEFT
7
BLK
7
RIGHT
FIG. 31 SERVER POWER RELAYS
Page 28
P1379
28222 081597
If continuity is not present as described, replace the
solenoid valve.
SERVICE (cont.)
SOLENOID VALVE
5
IC
4
AT
2
2.5
3
6
7
-M
-O
NN
BU
2
1.5
3
4
8
5
.5
5
IC
4
AT
1
ES
UT
MIN
NN
BU
3
6
1 1⁄2
ES
UT
C
IN
3
. M
ES 0 VA
UT AT
12IC
MIN 00
ES
-M VAC
-O
UT
6-00 0
MIN
48NN - 12
BU
24
20
P/N N 26
P/
gal
ST
3
4
ON
/W
AR
AR
T
MER
8
5
2
6 1
2
2
.
ES UTES
UT INIC
2.5
MIN -MMATVAC
-O 0
1
NN - 12
ES
BU
UT
20
C
3
MIN N 26
0 VA
P/
12
ES
00
UT
6-00
MIN
48
24
P/N
1.5
1
SE
RE
AD
LE
CT
OR
Y
1 2 3 4 5
6
BUNN
1 2 3 4 5
6
.500 gpm FLOW
90 psig max operating pressure
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
(Repl. Screen #23721.0000)
.5
gal
1 gal
1⁄2
7
-M
-O
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.
2
6
1
1
FIG. 32 SOLENOID VALVE
P973
Location:
The solenoid valve is located inside the lower right
front of the brewer.
Test Procedure:
1. Disconnect the brewer from the power source and
draw 1/4 gallon of water from faucet.
2. Remove both wires from the solenoid valve coil
terminals.
3. With a voltmeter check the voltage across the
violet wire and white wire on 120/208 volt and 120/
240 volt three wire models or violet wire and red
wire on 200 volt and 240 volt two wire 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 200, 230 or 240V
two wire models.
4. 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.
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. 33 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. Check for continuity across the solenoid valve coil
terminals.
WHI
Level
Control
Board
WHI totoLevel
Control
Board
T3 T3
(120/208V
or
120/240V
Electro/mechanical)
(120/208V or 120/240V Three
WHI to Terminal Block (120/208V or 120/240V
Models)
Electronic)
RED
to Level Control Board T3
Red to Level Control Board T3 (200 or 240V
(200V
or 240V Two
Wire Assy
Models)
Electro/mechanical
or Control
T4 Electronic)
VIO totoLevel
Control
Board
T1 (Electro/mechanical)
VIO
Level
Control
Board
T1
If continuity is present as described, reconnect the
white and violet wires on the 120/208 and 120/240 volt
brewers or the red and violet wires on 200, 230 or 240
volt brewers.
Page 29
WHI/BLU to Control Assy #1 (Electronic)
FIG. 33 SOLENOID VALVE TERMINALS
P799
28222 081597
SERVICE (cont.)
WITH RELAY (Prior to S.N. DUAL026000)
START SWITCHES
GRN to Left Relay Terminal "A"
D
B IS
!
R EFOCO
E
W
P R NN
LA E E
A
C R CT
R
E E
N
M M FR
E O O
IN
N V
T A M
G
O L P
F O O
A F W
N A E
Y N R
C Y S
O PA O
M N U
P E R
O L C
N O E
E R
N
T!
WHI/RED to Left ON/OFF Switch
to Left Timer TL1
LEFT
GRN to Right Relay Terminal "A"
R
TE
T WA
HO
ION
UT
!
!
CA
WHI/VIO to Right ON/OFF Switch
and Right Timer TL1
ER
ON CANT
UTI RD DE
CA DISCA
IF:
D
CKEHED
PTY
. CRAATC
DRYEN EM ME
D
. SCR
ILE WH H FLA IC
CTR
. BO TED HIG
ELE
. HEAD ON D
Y
OSE UR
N
. USEEXP
ATIO
NTSINJ
TS
. OR MEKS
POR
EN
COR
ELE
RIS
NT
IC
LY
CO T
MAT
N-OMP
EL
BUN
CO
NN E HO
1985
FU AR
TO
RE
ILU
FA
658
PN:
P1361
FIG. 34 START SWITCHES
RIGHT
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.
If continuity is present as described, reconnect the
wires, the switch is operating properly.
If continuity is not present as described, replace the
switch.
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. 35 when reconnecting the wires.
P992
WITHOUT RELAY(After S.N. DUAL026000)
YEL to Timer #5
BLK to On/Off
Switch
ORG to Timer #3
BLK to SH
Transformer
#1
LEFT
WHI/YEL to Timer
#5
BLK to On/Off
Switch
WHI/ORG to Timer
#3
Page 30
BLK to SH
Transformer
#1
RIGHT
FIG. 35 START SWITCH TERMINALS
28222 101599
SERVICE (cont.)
If continuity is present as described, reconnect the
wires, the tank heaters are operating properly.
If continuity is not present as described, replace the
tank heater(s).
NOTE - If the tank heater remains unable to heat,
remove and inspect the heater for cracks in the sheath.
TANK HEATERS
1 1⁄2
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. 37 when reconnecting the wires.
gal
1 gal
1⁄2
gal
RE
SE
ON
5
IC
AT
-M
-O
4
NN
BU
2
1.5
2
2.5
3
4
6
ST
7
BU
2
1.5
2
2.5
1
1
.5
4
6
AR
AD
Y
OR
MER
T
8
2
6
1
ES
UT
MIN
1 1⁄2
ES
UT
C
IN
3
. M
ES 0 VA
UT AT
12IC
MIN 00
ES
-M VAC
-O
UT
6-00 0
MIN
48NN - 12
BU
24
20
P/N N 26
P/
gal
1 gal
1⁄2
gal
ST
7
3
5
3
/W
CT
3
5
1
1
.5
5
IC
AT
-M
-O
4
NN
AR
LE
ON
/W
AR
AR
T
MER
8
2
.
6 1
ES UTES
UT INIC
MIN -MMATVAC
-O 0
SE
NN - 12
ES
BU
UT
20
C
3
MIN N 26
0 VA
P/
12
ES
00
UT
6-00
MIN
48
24
P/N
RE
AD
LE
CT
OR
Y
BLK to Contactor
FIG. 36 TANK HEATERS
P973
RED to Contactor
1
2
3
4
5
6
1
2
3
4
5
6
Location:
The tank heaters are located on the left and right
side of the tank lid.
Test Procedure:
1. Disconnect the brewer from the power supply.
2 Check the voltage across the black and the red
wires on three wire 120/208V, 120/240V or two
wire 200, 230 or 240 volt models on the tank
heaters. With the control thermostat turned to the
"ON" position (fully clockwise), connect the brewer
to the power supply and check the voltage across
the wires with a voltmeter. 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, 230 or
240 volt models.
3. Disconnect the brewer from the power supply.
LEFT & RIGHT
P803
FIG 37. TANK HEATER TERMINALS
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the
wiring diagrams and check the wiring harness.
4. Remove the black and red wires from the tank
heaters.
5. Check for continuity across the terminals of the
tank heaters.
Page 31
28222 081597
reconnect the orange wire to TL3, white/brown to TL4,
and yellow to TL5 then proceed to #5.
If voltage is not present as described, refer to the
wiring diagrams and check the brewer wiring harness.
SERVICE (cont.)
TIMERS (Early Models)
1 1⁄2
5. Place a server under the funnel and select 1/2
gallon position on the selector switch.
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 20 seconds for 1/2 gallon batch.
b.) 200 to 240 volts ac for two wire 200, 230 or
240 volt models for approximately 20 seconds
for 1/2 gallon batch.
7. Place a 1-3/4 gallon server under the funnel. Select
a 1 gallon batch and repeat #6. The voltage indication should remain for approximately 40 seconds.
8. Select a 1-1/2 or 1-3/4 gallon batch and repeat #6.
The indication should remain approximately 1
minute.
gal
1 gal
1⁄2
gal
RE
SE
ON
5
IC
AT
-M
-O
4
NN
BU
2
1.5
2
2.5
3
4
6
ST
7
BU
2
1
6
ES
UT
MIN
Y
T
1 1⁄2
ES
UT
C
IN
3
. M
ES 0 VA
UT AT
12IC
MIN 00
ES
-M VAC
-O
UT
6-00 0
MIN
48NN - 12
BU
24
20
P/N N 26
P/
gal
1 gal
1⁄2
gal
ST
7
ON
/W
AR
AR
T
MER
8
5
2
6
1
.
ES UTES
UT INIC
2.5
1.5
MIN -MMATVAC
-O 0
1
NN - 12
ES
BU
UT
20
C
3
MIN N 26
0 VA
P/
12
ES
00
UT
6-00
MIN
48
24
P/N
2
AD
OR
8
1
SE
RE
AD
LE
CT
OR
Y
1 2 3 4 5
6
BUNN
1 2 3 4 5
6
.500 gpm FLOW
90 psig max operating pressure
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
(Repl. Screen #23721.0000)
.5
3
4
CT
2
6
3
4
/
LE
MER
3
5
1
1
.5
5
IC
AT
-M
-O
NN
AR
WAR
FIG. 38 TIMERS
P973
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, 230 or
240 volt models.
4. Disconnect the brewer from the power source.
If voltage indications were as described the timer is
operating properly.
If voltage indications were other than described, replace the timer.
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 dial plate and circuit board with nylon
spacers to component mounting bracket.
5. Refer to Fig. 39 when reconnecting wires.
6. Adjust timer dials as required.
If voltage is present as described for the right timer
reconnect the white/orange wire to TL3, white/green
to TL4 and white/yellow to TL5. For the left timer
Page 32
28222 062200
SERVICE (cont.)
Timers (Early Models)(cont.)
WITH RELAY (Prior to S.N. DUAL026000)
5
BU
2
NN
-O
-M
IC
1
6
2
MIN
1
MIN
3
UT
ES
P/N
24
48
5
7
IC
AT
-M
-O
4
NN
BU
5
8
2
1
.5
6
4
3
5
2.5
1.5
MIN
AT
4
3
UT
6-0
00
UT
3
ES
2
ES
12
0
0V
1
AC
1
3
.5
ES
UT
MIN
P/N
7
8
1
6
2
2.5
1.5
6
4
3
2
ES
UT
MIN
ES
UT
AC
MIN
0V
12
0
00
6-0
48
24
WHI/RED TL1 to Left ON/OFF Switch
WHI/RED TL1 to Left Start Switch
WHI TL2 To Terminal Block and Left Soft Heat Relay "B"
(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.
WHI/VIO TL1 to Right ON/OFF Switch
WHI/VIO TL1 to Right Start Switch
WHI TL2 To Terminal Block and Right Soft Heat Relay "B"
(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 Soft Heat Relay #9
WHI/BRN TL4 to Left Dispense Valve
YEL TL5 to Left Soft Heat Relay #6
WHI/ORA TL3 to Right Soft Heat Relay #9
WHI/GRN TL4 to Right Dispense Valve
WHI/YEL TL5 to Right Soft Heat Relay #6
LEFT
RIGHT
WITHOUT RELAY (After S.N. DUAL026000)
5
BU
2
NN
-O
-M
IC
MIN
ES
P/N
24
6
48
IC
AT
-M
-O
4
NN
BU
5
8
1
MIN
1
3
UT
5
7
6
1
6
2
2.5
.5
4
3
5
2
1.5
MIN
AT
4
3
UT
-00
E
UT
3
S
2
12
2.5
1.5
ES
00
0V
1
AC
1
3
.5
6
2
ES
UT
MIN
P/N
4
6
7
3
8
2
1
ES
UT
MIN
ES
UT
AC
MIN
0V
12
0
00
6-0
48
24
WHI/RED TL1 to Left ON/OFF Switch
WHI/RED TL1 to Left Start Switch
WHI TL2 To Terminal Block and Left Soft Heat Relay "B"
(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 Terminal
WHI/BRN TL4 to Left Dispense Valve
YEL TL5 to Left Start Switch Terminal
WHI/VIO TL1 to Right ON/OFF Switch
WHI/VIO TL1 to Right Start Switch
WHI TL2 To Terminal Block and Right Soft Heat Relay "B"
(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 Terminal
WHI/GRN TL4 to Right Dispense Valve
WHI/YEL TL5 to Right Start Switch Terminal
LEFT
RIGHT
FIG. 39 TIMER TERMINALS
Page 33
P1070
28222 062200
If continuity is present as described, reconnect the
wires and proceed to #5.
If continuity is not present as described, refer to the
wiring diagrams and check the brewer wiring harness.
SERVICE (cont.)
TIMERS (Late Models)
5. 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. The indication must be zero volts.
If voltage indications are other than described, disconnect the brewer from the power source and replace the
timer.
P2194
FIG. 40 TIMERS
Location:
The timers are located inside the left front of the
brewer on the upper part of the component bracket.
Test Procedures:
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 panel.
2. Check the voltage across terminals TL1 and TL2
with a voltmeter 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 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 is present as described, proceed to #4.
If voltage is not present as described, refer to the
wiring diagrams and check the brewer wiring harness.
4. Disconnect the ORA or WHI/ORA wire from terminal TL3 and the YEL or WHI/YEL wire from terminal TL5. Check for continuity across the two wires
when the start switch is pressed to the "START"
position.
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 two wire 120 volt models,
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.
If voltage indications are other than described, disconnect the brewer from the power source and replace the
timer.
7. Remove the test equipment and connect all wires
as described below.
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 six #6-32 screws securing circuit
board to component mounting bracket.
2. Remove circuit board and nylon spacers.
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. 41 when reconnecting the
wires.
5. Install new circuit board with nylon spacers to
component mounting bracket using four #6-32
screws.
6. Adjust the timer as described below.
Page 34
28222 062200
SERVICE (cont.)
TIMERS (Late Models)(cont.)
TL5
TL4
SET
J2
TL3
TL2
TL1
J1
SET
LOCK
LOCK
Timer Setting:
NOTE: Check that the brewer is connected to water
supply, the tank is properly filled, and a funnel and
server are in place, prior to setting or modifying
volumes.
NOTE: All volume settings must be done with the
sprayhead installed.
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 (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 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).
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/VOI wire to TL1
RED
WHI/RED
P2037
FIG. 41 TIMER WIRING
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, 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 time once programmed, you can set the
SET/LOCK switch to the "LOCK" position. This will
prevent any further programming.
Page 35
28222 062200
SERVICE (cont.)
5. Disconnect the blue/black wires from terminals #7
and #12 on the transformer.
6. With a voltmeter check the voltage across the blue/
black wires. Connect the brewer to the power
source. The indication must be 24 volts ac.
TRANSFORMERS
1 1⁄2
gal
1 gal
1⁄2
gal
RE
SE
ON
5
IC
AT
-M
-O
4
NN
BU
2
2
2.5
1.5
3
4
6
ST
7
5
IC
AT
-M
-O
NN
BU
1
ES
UT
MIN
1 1⁄2
ES
C
INUT
. M
ES 0 VA
UT AT
12IC
MIN 00
ES
-M VAC
-O
UT
6-00 0
MIN
48NN - 12
BU
24
20
P/N N 26
P/
3
4
6
If voltage is present as described the transformer is
operating properly.
If voltage is not present as described, replace the
transformer.
Removal and Replacement:
1. Disconnect all the wires from the transformer that
is to be replaced.
2. Remove the two #6-32 screws and the two #6-32
keps nuts securing the transformer to the brewer
base plate.
3. Remove transformer and discard.
4. Install new transformer on the brewer base plate
securing with two #6-32 screws and two #6-32
keps nuts.
5. Refer to Fig. 43 to reconnect the wires.
gal
gal
ST
7
3
4
MER
T
1 gal
1⁄2
ON
/W
AR
AR
T
MER
8
5
2
.
2.5
SE
RE
AD
LE
CT
OR
Y
1 2 3 4 5
6
BUNN
1 2 3 4 5
6
.500 gpm FLOW
90 psig max operating pressure
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
(Repl. Screen #23721.0000)
.5
2
Y
8
1
6 1
ES UTES
UT INIC
MIN -MMATVAC
-O 0
1
NN - 12
ES
BU
UT
20
C
3
MIN N 26
0 VA
P/
12
ES
00
UT
6-00
MIN
48
24
P/N
2
AR
AD
OR
2
6
3
1.5
/W
CT
3
5
1
1
.5
AR
LE
FIG. 42 TRANSFORMERS
P973
Location:
The transformers are located in the brewer base on
the right center of the base plate.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the black wire from terminal #1 (from
the server relay) and the white or red wire from
terminal # 6.
3. With a voltmeter check the voltage across the
black and white wire. Connect the brewer to the
power supply. 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, 230 or 240
volt models.
4. Disconnect the brewer from the power supply.
If voltage is present as described reconnect the wires
and proceed to #5.
If voltage is not present as described, refer to the
wiring diagrams and check the brewer wiring harness.
Page 36
28222 062200
SERVICE (cont.)
TRANSFORMERS (cont.)
WITH RELAY (Prior to S.N. DUAL026000)
#6 WHI or RED from
Transformer Terminal #2
#6 WHI to Transformer
Terminal #2
#12 BLU/BLK to
Right Circuit Breaker
#5 BLK from
Transformer
Terminal #1
#7 BLU/BLK to Right
Rectifier "AC"
#2 WHI or RED to
Transformer Terminal #6
#2 WHI to Right
Transformer Terminal #2
#1 BLK to Left Server
Power Relay
#1 BLK from Transformer
Terminal #5
#2 WHI from Left
Transformer
Terminal #2
1 2 3 4 5
#7 BLU/BLK to Left
Rectifier "AC"
6
6
#12 BLU/BLK to Left
Circuit Breaker
1 2 3 4 5
#6 WHI or RED to
Terminal Block
#5 BLK to Transformer
Terminal #1
#2 WHI or RED from
Transformer Terminal #6
#1 BLK to Right
Server Power Relay
#1 BLK to Transformer
Terminal #5
LEFT
RIGHT
WITHOUT RELAY (After S.N. DUAL026000)
#6 WHI or RED from
Transformer Terminal #2
#6 WHI to Transformer
Terminal #2
#12 BLU/BLK to
Right Circuit Breaker
#5 BLK from
Transformer
Terminal #1
#7 BLU/BLK to Right
Rectifier "AC"
#2 WHI or RED to
Transformer Terminal #6
#2 WHI to Right
Transformer Terminal #2
#1 BLK to Left Start
Switch
#1 BLK from Transformer
Terminal #5
#2 WHI from Left
Transformer
Terminal #2
1 2 3 4 5
#7 BLU/BLK to Left
Rectifier "AC"
6
6
#12 BLU/BLK to Left
Circuit Breaker
1 2 3 4 5
#6 WHI or RED to
Terminal Block
#5 BLK to Transformer
Terminal #1
#2 WHI or RED from
Transformer Terminal #6
#1 BLK to Right
Start Switch
LEFT
#1 BLK to Transformer
Terminal #5
RIGHT
FIG. 43 TRANSFORMER TERMINALS
Page 37
P1383
28222 062200
SCHEMATIC WIRING DIAGRAM DUAL BREWER SH
(W/ONE-GRINDER INTERFACE)
(Prior to S.N. DUAL026000)
L1
L2
N
GRN
LIMIT THERMOSTAT
BLK-12
BLK-12
RED-12
BLK-12
K1
N.O.
BLK-12
TANK HEATERS (TWO)
RED-12
RED-12
K1
N.O.
READY INDICATORS
OVERFLOW
PROTECTION SW
RED
RED
BLK
TANK HEATER
CONTACTOR
SW. & THERMOSTAT
BLK
BLU
REFILL
OPTIONAL
RECOVERY BOOSTER
BLU
RED
LIQUID 1
LEVEL 2
BOARD 3
4
BLK
K2 N.O.
WHI
K1
K3 N.O.
VIO
BLU
WHI
SOL
WHI
PIN-20
PROBE
BLU
BLK
OPTIONAL 3-SET SELECTOR SWITCHES SHOWN
WITH ONE-GRINDER INTERFACE OPTION
TAN
GRY
1
RIGHT 2
BREW 3
TIMER 4
5
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
FRACTIONAL BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
RIGHT
DISPENSE
6
WHI/RED
GRY
PNK
TAN
RIGHT SERVER
POWER RELAY
WHI/VIO
WHI/RED
WHI
LEFT START
SWITCH
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
3/4 BATCH
BATCH COMMON
1
LEFT 2
BREW 3
TIMER 4
5
WHI/VIO
SOL
LEFT
DISPENSE
ORA
WHI/BRN
SOL
YEL
6
7
7
9
OPTIONAL
RECOVERY BOOSTER
WHI/RED
K5
N.O.
K3
WHI/BRN
1
K4
N.C.
BLU/BLK
12
4
AMP
2
CIRCUIT
BREAKER
BLK
5
6
WHI
WHI/RED
K5
N.C.
WHI
WHI
K5
B
A
LEFT SERVER
POWER RELAY
WHI/RED
WHI/GRN
WHI/RED
1
B
WHI
GRY
1
WHI
K4
A
GRN
LEFT WATER
BYPASS
S
W
GRN
RIGHT START
SWITCH
WHI/VIO
LEFT SWITCH
K2
WHI/RED
FRACTIONAL BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
S
E
L
E
C
T
O
R
WHI/VIO
WHI/GRN
WHI
TAN
TAN
K4
N.O.
RIGHT SWITCH
GRIND
SELECTOR
SWITCH
OPTIONAL
RECOVERY BOOSTER
9
WHI/RED
GRINDER INTERFACE
CONNECTOR
4
GRY 3
PNK 2
TAN 1
GRY
PNK
L
T
SOL
RIGHT WATER
BYPASS
WHI/GRN
SOL
WHI/VIO
S
W
WHI
WHI/ORA
WHI/GRN
WHI/YEL
3/4 BATCH
BATCH COMMON
R
T
S
E
L
E
C
T
O
R
WHI/VIO
1
BLU/BLK
BLK
AC
–
RECTIFIER
+
AC
2
LEFT TRANSFORMER
120/208 VOLTS AC OR
120/240 VOLTS AC 3 WIRE
SINGLE PHASE
4
AMP
CIRCUIT
BREAKER
BLK
5
RED
BLU/BLK
7
BLU/BLK
12
+
–
24VDC
–
+
WHI
6
BLU/BLK
AC
–
RECTIFIER
+
AC
BLK
RED
BLU/BLK
7
RIGHT TRANSFORMER
Front view of Brewer
Server Connector
+
–
24VDC
–
+
Front view of Brewer
Server Connector
28218.0000A 7/97 © 1997 BUNN-O-MATIC CORPORATION
Page 38
28222 062200
SCHEMATIC WIRING DIAGRAM DUAL BREWER SH
(W/ONE-GRINDER INTERFACE)
(After S.N. DUAL026000)
L1
LIMIT THERMOSTAT
BLK-12
BLK-12
BLK-12
TANK HEATERS (TWO)
RED-12
RED-12
K1
N.O.
READY INDICATORS
OVERFLOW
PROTECTION SW
RED
RED
BLK
N
RED-12
BLK-12
K1
N.O.
L2
GRN
TANK HEATER
CONTACTOR
SW. & THERMOSTAT
BLK
BLU
REFILL
OPTIONAL
RECOVERY BOOSTER
BLU
RED
VIO
BLU
LIQUID 1
LEVEL 2
BOARD 3 PNK-20
4
BLK
K2 N.O.
WHI
K1
K3 N.O.
BLU
WHI
SOL
WHI
PROBE
BLK
OPTIONAL 3-SET SELECTOR SWITCHES SHOWN
WITH ONE-GRINDER INTERFACE OPTION
TAN
GRY
1
RIGHT 2
BREW 3
TIMER 4
5
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
FRACTIONAL BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
SOL
RIGHT
DISPENSE
RIGHT WATER
BYPASS
WHI/GRN
SOL
WHI/VIO
WHI/RED
OPTIONAL
RECOVERY BOOSTER
WHI/VIO
K2
WHI/GRN
WHI/RED
GRINDER INTERFACE
CONNECTOR
4
GRY 3
PNK 2
TAN 1
GRY
PNK
WHI
LEFT START
SWITCH
WHI/VIO
RIGHT SWITCH
TAN
S
W
WHI
WHI/ORA
WHI/GRN
WHI/YEL
3/4 BATCH
BATCH COMMON
R
T
S
E
L
E
C
T
O
R
WHI/VIO
GRIND
SELECTOR
SWITCH
GRY
PNK
BLK
LEFT SWITCH
RIGHT START
SWITCH
N.C.
N.C.
BLK
N.O.
WHI
N.O.
WHI
L
T
WHI/RED
TAN
TAN
WHI
GRY
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
FRACTIONAL BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
S
E
L
E
C
T
O
R
3/4 BATCH
BATCH COMMON
1
LEFT 2
BREW 3
TIMER 4
5
WHI/RED
LEFT
DISPENSE
ORA
WHI/BRN
YEL
SOL
LEFT WATER
BYPASS
WHI/VIO
K3
WHI/RED
WHI/RED
S
W
WHI/RED
WHI/BRN
WHI/GRN
SOL
OPTIONAL
RECOVERY BOOSTER
BLK
BLK
1
BLU/BLK
12
2
CIRCUIT
BREAKER
BLK
5
WHI
6
1
BLU/BLK
4
AMP
BLK
AC
–
RECTIFIER
+
AC
2
LEFT TRANSFORMER
120/208 VOLTS AC OR
120/240 VOLTS AC 3 WIRE
SINGLE PHASE
4
AMP
CIRCUIT
BREAKER
BLK
5
RED
BLU/BLK
7
BLU/BLK
12
+
–
24VDC
–
+
WHI
6
BLU/BLK
AC
–
RECTIFIER
+
AC
BLK
RED
BLU/BLK
7
RIGHT TRANSFORMER
Front view of Brewer
Server Connector
+
–
24VDC
–
+
Front view of Brewer
Server Connector
28218.0003A 10/99 © 1999 BUNN-O-MATIC CORPORATION
Page 39
28222 062200
SCHEMATIC WIRING DIAGRAM
DUAL SH, 230V CE
L1
LIMIT THERMOSTAT
BLK-12
BLK-12
K1
N.O.
RED-12
BLK-12
TANK HEATERS (TWO)
BLK-12
RED-12
RED-12
K1
N.O.
READY INDICATORS
OVERFLOW
PROTECTION SW
RED
RED
BLK
L2
GRN/YEL
THERMAL
SAFETY FUSE
THERMAL
SAFETY FUSE
TANK HEATER
CONTACTOR
SW. & THERMOSTAT
BLK
BLU
RED
K1
N.C.
REFILL
OPTIONAL
RECOVERY BOOSTER
BLU
RED
LIQUID 1
LEVEL 2
BOARD 3
4
BLK
K2 N.O.
K3 N.O.
VIO
BLU
RED
SOL
RED
PIN-20
PROBE
BLU
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
3/4 BATCH
BATCH COMMON
RED
SOL
RIGHT START
SWITCH
N.C.
BLK
R
T
RIGHT WATER
BYPASS
WHI/GRN
SOL
WHI/VIO
S
E
L
E
C
T
O
R
WHI/VIO
RED
WHI/ORA
WHI/GRN
WHI/YEL
1
RIGHT 2
BREW 3
TIMER 4
5
WHI/RED
RIGHT
DISPENSE
BLK
WHI/GRN
N.O.
OPTIONAL RECOVERY BOOSTER
WHI/RED
GRINDER INTERFACE
CONNECTOR
4
GRY
3
PNK 2
TAN 1
GRY
PNK
ON/OFF
RED
LEFT START
SWITCH
WHI/VIO
RIGHT SWITCH
TAN
S
W
GRIND
SELECTOR
SWITCH
GRY
PNK
WHI/VIO
K2
N.C. BLK
BLK
ON/OFF
RED
N.O.
YEL
ORA
RED
WHI/RED
L
T
TAN
TAN
LEFT SWITCH
GRY
FRACTIONAL BATCHES
(CONNECT
AS REQUIRED)
FULL BATCH
(NO CONNECTION)
S
E
L
E
C
T
O
R
1/4 BATCH
1/3 BATCH
1/2 BATCH
2/3 BATCH
RED
WHI/RED
1
LEFT 2
BREW 3
TIMER 4
5
3/4 BATCH
BATCH COMMON
LEFT
DISPENSE
RED
ORA
WHI/BRN
SOL
YEL
LEFT WATER
BYPASS
WHI/VIO
WHI/BRN
WHI/GRN
SOL
BLK
1
2
BLK
5
RED
6
BLU/BLK
12
11
4
AMP
CIRCUIT
BREAKER
RESETTABLE
FUSE
8
BLU/BLK
7
LEFT TRANSFORMER
230 VOLTS AC 2 WIRE
SINGLE PHASE
BLU/BLK
BLK
1
AC
–
RECTIFIER
+
AC
BLU/BLK
12
BLK
2
RED
+
–
24VDC
–
+
WHI/RED
OPTIONAL RECOVERY BOOSTER
WHI/RED
WHI/RED
S
W
K3
BLK
5
RED
6
11
4
AMP
CIRCUIT
BREAKER
RESETTABLE
FUSE
8
BLU/BLK
7
RIGHT TRANSFORMER
Front view of Brewer
Server Connector
BLU/BLK
AC
BLK
–
RECTIFIER
+
AC
RED
+
–
24VDC
–
+
Front view of Brewer
Server Connector
28218.0001C 11/98 © 1997 BUNN-O-MATIC CORPORATION
Page 40
28222 062200
DUAL SH BREWER W/DIGITAL BREWER CONTROL
SCHEMATIC WIRING DIAGRAM
WHI/VIO
120V.A.C.
208 0R 240V.A.C.
120V.A.C.
WHI
BLK
D
I
G
I
T
A
L
B
R
E
W
E
R
C
O
N
T
R
O
L
WHI/RED
WHI/RED
WHI
WHI
WHI
WHI
J1-1
J1-5
J1-10
J1-15
GRN
RT ON/OFF SW
BLK
BLK
BLK
BLK
BLK
WHI/GRN
WHI/GRN
WHI
TAN
BLU
RT BREW
OPTIONAL
RT BYPASS
SOL
SOL
RT LIMIT T'STAT
BLK
BLK RT TANK HEATER BLU
WHI
P1
TRIAC
WHI/VIO
BLU
P2
TAN
WHI
LT ON/OFF SW
BLK
TAN
BLU
J1-20
BLK
WHI/BLU
C
I
R J1-24
C
U J3-1
I
T
B
O
A
R
D
WHI
REFILL
LT BREW
OPTIONAL
LT BYPASS
SOL
SOL
SOL
P1
WHI
BLK
WHI/VIO
J3-5
LT LIMIT T'STAT
LT TANK HEATER
BLU
BLK
BLK
P2
GRY
P2
P2
BLU
RED
P2
P1
PNK
TAN
WHI
WHI
GRY
TANK
TEMP
t° SENSOR
GRY
OPTIONAL
DAY/NIGHT
SWITCH
PNK
BLK
1
WHI 2
6
5 CONTROL
4 & DISPLAY
3 CONNECTOR
2 INTERFACE
1
BLU/BLK
12
PNK
TANK LEVEL
SENSING
AC
–
RECTIFIER
+
AC
BLK
LEFT TRANSFORMER
120/208 VOLTS AC OR
120/240 VOLTS AC 3 WIRE
SINGLE PHASE
BLK
BLK
BLK
LT START SW
4
GRINDER
3
INTERFACE
PNK
2 CONNECTOR
TAN
1
GRY
S
W
I
T
C
H
1
PNK
L
E
F
T
B
A
T
C
H
S
E
L
E
C
T
S
W
I
T
C
H
BLU/BLK
12
WHI 2
RED
BLU/BLK
7
WHI/GRN
BLK
BLU/BLK
4
AMP
BLK
WHI
WHI
TAN
WHI/VIO
CIRCUIT
BREAKER
5
6
TAN
GRY
P1
PNK
BLU
GRINDER
SELECTOR
SWITCH
P3
GRY
GRN
RED
BLK
RED
RED
PNK
WHI
S
E
L
E
C
T
P4
P2
RED
PNK
WHI
RED
B
A
T
C
H
WHI/RED
READY
GRY
J3-40
R
I
G
H
T
PNK
WHI/VIO
J3-30
J3-35
PNK
TAN
P1
P1
TAN
GRY
P3
WHI
WHI
RED
RT START SW
P4
PNK
TAN
PNK
GRY
J3-25
BLK
BLK
RED
BLK
J3-20
RED
BLK
OVERFLOW PROTECTION SWITCH
RED
RED
J3-15
WHI/VIO
TAN
PROBE, DRY PLUG
PREVENTION
BLK
YEL
BLK
J3-10
TRIAC
BLU
+
–
24VDC
–
+
CIRCUIT
BREAKER
BLK
6
BLU/BLK
AC
–
RECTIFIER
+
AC
BLK
RED
5
WHI
4
AMP
BLU/BLK
7
RIGHT TRANSFORMER
Front view of Brewer
Server Connector
+
–
24VDC
–
+
Front view of Brewer
Server Connector
29331.0000B 7/99 © 1999 BUNN-O-MATIC CORPORATION
Page 41
28222 062200