Bunn Single SH Instruction and safety manual

BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: [phone] F X: [phone]
www.bunnomatic.com
OPERATING & SERVICE MANUAL
BUNN
®
CAUTION
CAUTION
DISCARD DECANTER
DISCARD DECANTER
IF:
IF:
. CRACKED
. CRACKED
. SCRATCHED
. SCRATCHED
. BOILEDDRY
. BOILED DRY
. HEATEDWHENEMPTY
. HEATED WHEN EMPTY
. USEDONHIGHFLAME
. USED ON HIGH FLAME
. OREXPOSEDELECTRIC
. OR EXPOSED ELECTRIC
ELEMENTS
ELEMENTS
FAILURE TO COMPLY RISKS INJURY
FAILURE TO COMPLY RISKS INJURY
PN:658
PN:658
1985BUNN-O-MATICCORPORATION
1985BUNN-O-MATIC CORPORATION
FUNNEL CONTENTS
FUNNEL CONTENTS
ARE HOT
ARE HOT
!
!
CAUTIONHOTWATER
DISCONNECTFROMPOWERSOURCE
BEFOREREMOVALOFANYPANELOR
REPLACEMENTOFANYCOMPONENT!
WARNING
!
DU L™ SH
DBC W/ FUNNEL LOCKS, FUNNEL
SENSOR & SERVER DETECT
32248.0000B 3/01 ©2000 Bunn-O-Matic Corporation

Page 2
W RR NTY
Bunn-O-Matic Corp. (“Bunn”) arrants the equipment manufactured by it to be commercially free from defects
in material and orkmanship existing at the time of manufacture and appearing ithin one year from the date of
installation. In addition:
1.) Bunn arrants electronic circuit and/or control boards to be commercially free from defects in material and
orkmanship for t o years from the date of installation.
2.) Bunn arrants the compressor on refrigeration equipment to be commercially free from defects in material
and orkmanship for t o years from the date of installation.
3.) Bunn arrants that the grinding burrs on coffee grinding equipment ill grind coffee to meet original factory
screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, hichever comes first.
This arranty does not apply to any equipment, component or part that as not manufactured by Bunn or that,
in Bunn’s judgement, has been affected by misuse, neglect, alteration, improper installation or operation, improper
maintenance or repair, damage or casualty.
THE FOREGOING W RR NTY IS EXCLUSIVE ND IS IN LIEU OF NY OTHER W RR NTY, WRITTEN OR
OR L, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, NY IMPLIED W RR NTY OF EITHER
MERCH NT BILITY OR FITNESS FOR P RTICUL R PURPOSE. The agents, dealers or employees of Bunn are
not authorized to make modifications to this arranty or to make additional arranties that are binding on Bunn.
Accordingly, statements by such individuals, hether oral or ritten, do not constitute arranties and should not
be relied upon.
The Buyer shall give Bunn prompt notice of any claim to be made under this arranty by telephone at (217)
529-6601 or by riting to Post Office Box 3227, Springfield, Illinois, 62708-3227. If requested by Bunn, the Buyer
shall ship the defective equipment prepaid to an authorized Bunn service location. If Bunn determines, in its sole
discretion, that the equipment does not conform to the arranty, Bunn shall repair the equipment ith no charge
for parts during the arranty period and no charge for labor by a Bunn Authorized Service Representative during
the arranty period. If Bunn determines that repair is not feasible, Bunn shall, at its sole option, replace the
equipment or refund the purchase price for the equipment.
THE BUYER’S REMEDY G INST BUNN FOR THE BRE CH OF NY OBLIG TION RISING OUT OF THE S LE
OF THIS EQUIPMENT, WHETHER DERIVED FROM W RR NTY OR OTHERWISE, SH LL BE LIMITED, S
SPECIFIED HEREIN, TO REP IR OR, T BUNN'S SOLE OPTION, REPL CEMENT OR REFUND. Bunn shall not
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 do n time, cost of substitute equipment, facilities or services,
or any other special, incidental or consequential damages.
32248 100500

Page 3
00656.0000
!WARNING
HOT WATER
00831.0000
00658.0000
20201.5600
USER NOTICES
The notices on this bre er should be kept in good condition. Replace unreadable or damaged labels.
32248 100500
INTRODUCTION
This bre er utilizes BUNN® DBC™ technology to control most of its functions. The controller is factory set
to bre in accordance ith accepted coffee industry standards, yet may be customized by the o ner to achieve
a variety of coffee flavor profiles. All user-accessible features of the controller are vie ed and entered using the
display unit, an internal box permanently attached to the bre er. The bre er operating settings are stored in the
controller and ill remain even in the event of po er failure. The bre er is also equipped ith a hot ater faucet
for allied beverage use. The bre er is specifically designed for use ith 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.
10044.0000

Page 4 32248 100500
PLUMBING HOOK-UP
1. Flush the ater line and securely attach it to the flare fitting located on bottom of bre er.
2. Turn on the ater supply.
PLUMBING REQUIREMENTS
This bre er must be connected to a cold ater system ith operating pressure bet een 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 bre er. Install
a regulator in the line hen pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345 kPa). The ater
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" ater supply line. A tight coil of copper tubing in the ater line ill facilitate moving the bre er
to clean the counter top. Bunn-O-Matic does not recommend the use of a saddle valve to install the bre er. The
size and shape of the hole made in the supply line by this type of device may restrict ater flo .
This equipment must be installed to comply with the Basic Plumbing Code of the
Building Officials and Code dministrators International, Inc. (BOC )
and the Food Service Sanitation Manual of the Food and Drug dministration (FD ).
ELECTRIC L HOOK-UP
C UTION – Improper electrical installation ill 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.
4. Feed the cord through the strain relief and connect it to the terminal block.
5. Connect the bre er to the po er 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 bre er is disconnected from the po er source. If plumbing
has been hooked up, the bre er is ready for Initial Set-Up.
Requires 3- ire, grounded ser-
vice rated 120/208 or 120/240
volts ac, 30 amp, single phase,
60 Hz.
ELECTRIC L REQUIREMENTS
C UTION - The bre er must be disconnected from the po er source until specified in Initial Set-Up.

Page 5
INITI L SET-UP
C UTION – The bre er must be disconnected from the po er source throughout the initial set-up, except hen
specified in the instructions.
1. Insert an empty funnel into the funnel rails of one of the bre stations.
2. Place an empty server under the funnel.
3. Connect the bre er to the po er source. Water ill begin flo ing into the tank and stop hen the tank is filled
to its capacity. Display ill sho F ULT 7 until tank is filled ith ater.
4. Wait approximately t enty minutes for the ater in the tank to heat to the proper temperature.
TEMP RE DY
indicator ill come on hen tank is at operating temperature.
5. Place a small vessel beneath the faucet and open the faucet handle. Release it hen you hear the tank refilling.
6. Place Selector s itch in the desired position. Momentarily press the START s itch and initiate a bre cycle.
(Server and funnel must be present to bre )
7. Water volumes have been preset at the factory. Refer to adjustments for the DBC controller section of this
manual should the volume need to be increased or decreased.
8. The bre er is no ready for use in accordance ith the coffee bre ing instructions.
OPER TING CONTROLS
BREW SELECTOR SWITCH
Placing the selector s itch in the Small, Medium, or Large position selects the amount of coffee to be bre ed.
Repositioning this s itch after a bre cycle has been initiated does not change the bre batch in progress.
ST RT/STOP SWITCH
Momentarily pressing and releasing this s itch to the START position starts a bre cycle. Momentarily
pressing and releasing this s itch to the STOP position stops a bre cycle.
COFFEE BREWING
Three requirements must be met to bre : bre er up to operating temperature, funnel in position, and server
in position.
1. Select the desired batch size.
2. Insert a BUNN® filter into the funnel.
3. Pour the proper amount of fresh ground coffee into the filter and level the bed of grounds by gently shaking.
4. Slide the funnel into the funnel rails.
5. Place an empty server under the funnel.
6 Momentarily press and release the START s itch. Once bre cycle has been started, funnel is locked in place.
7. When bre ing is completed, simply discard the grounds and filter. Funnel lock ill release follo ing a
programmed length of time that starts at the end of the bre cycle.
CLE NING
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 al ays remain open.
NOTE – In hard ater areas, this may need to be done daily. It ill help prevent liming problems in the bre er and
takes less than a minute.
32248 100500

Page 6 32248 100500
DBC CONTROLLER
General
This bre er utilizes BUNN® DBC™ technology to control most of its functions. The controller is factory set to
bre in accordance ith accepted coffee industry standards, yet may be customized by the o ner to achieve a
variety of coffee flavor profiles. All user-accessible features of the controller are vie ed and entered using the
display unit. The bre er operating settings are stored in the controller and ill remain even in the event of po er
failure. Three requirements must be met in order to initiate a bre cycle, (1) Server must be present, (2) Funnel
must be present, (3) Tank must be up to bre ing temperature. Attempting to bre hen any or all requirements
are not met ill result in a non-bre ith flashing indicator(s). The display ill sho hat's rong along ith the
appropriate Left Ready or Right Ready indicator flashing. The display ill sho SEr hen server is missing, ill
sho FUnL hen funnel is missing, and ill sho COLd hen tank is not up to temperature. Display ill sho
any or all of these messages. As they are corrected, that message ill disappear. Once requirements are met, it
is necessary to press START again to initiate a bre cycle. Flashing indicators can be cleared by pressing the
STOP button.
The bre er also features funnel locks that prevents removing the funnel until they retract.
Home or FUNC Ø screen
When the unit is first connected, the display ill be in the “Home Screen” position here the actual temperature
of the ater in the tank is displayed. The display ill revert to this screen hen its keys have not been pressed for
more than 30 seconds or the “FUNC” key has been held, allo ing it to quickly scroll back to this screen. From
this screen all other functions are accessed. The bre er ill return to normal operation only after the display is
returned to this position. The “Home Screen” changes from tank temperature to sho ing time remaining in bre
cycle hen a bre cycle has been started. The time remaining is also accompanied by an "L" or "r", sho ing
hich side is bre ing. If both sides are bre ing the display sho s the last one initiated. "+" and "-" can be used
to toggle bet een L and r.
Moving to any other function screen
Pressing the “FUNC” key once ill scroll the display to the next available screen. Each controllable element of the
bre er has a function number assigned to it and that number 1, 2, 3, etc. ill be displayed in the upper left hand
corner of the display hen you reach that screen. The function number ill increase ith each press of the
“FUNC” key. To scroll back ards or go to a lesser function number, press and hold the function key, then press
the minus “–“ key. The function number ill decrease ith each press of the “FUNC” key. NOTE: Pressing the “–
“ key before the “FUNC” key ill change the setting of the function. It is important to press and hold the “FUNC”
key before pressing the “–“ key.
In any screen other than home screen, the tank heater and tank refill circuits are disabled. They ill
become active again as soon as the display unit returns to the home screen.
Programming- lways refer to Function List
Programming is divided into t o sections, "USER" and "SECURED". "USER" Section (Functions 1-18) is accessed
by pressing the FUNC button on the display box and entering the correct pass ord (unless pass ord is "0"). The
"+" and "-" buttons can be used to alter the target values (that are set in the "SECURED" section) by a maximum
amount of ±5%.
Access to the "SECURED" section (Functions 101 and up) is accessed by setting the RUN - PROGRAM s itch on
the DBC controller to PROGRAM and then entering the correct pass ord (unless pass ord is "0").

Page 7 32248 100500
Setting or adjusting the brewer’s controls
Refer to the function list for the accessible screen numbers and their values. Scroll to the desired function
screen and change the value by pressing either the “+” or “–“ keys.
The change ill not be entered into the programming until you move to another screen by scrolling either
up-or-do n ith the “FUNC” key.
Setting or adjusting the tank’s water temperature
At the home screen, the actual temperature of the ater in the tank is displayed. The target tank temperature
is set at the FUNC 101 screen hich is in the "SECURED" Section.
Setting or adjusting the batch volumes
Refer to the function list to determine the proper screen for batch size and side (left or right) of the bre er
being set. Program the total amount of bre ater as ell as the desired percentage of bypass
Note: If the programmed value doesn’t produce the exact volume desired, simply adjust it by pressing either
the “+” or “–“ keys as required to increase-or-decrease it by the difference in ounces.
Setting or adjusting parameters for pulsed brewing
The bre er is capable of pulsing the sprayhead and bypass flo s on-and-off over the course of the bre
cycle. This gives you the ability to fine-tune the bre er for specific flavor profiles. Refer to the function list for
the appropriate screen numbers and their values. Pulse bre ing can be programmed for any and all batch sizes.
Three settings must be made or changed for each:
a) The duration in seconds of Off time that occurs bet een the initial On and subsequent On times.
b) The initial On time in seconds for the sufficient grounds etting.
c) The duration in seconds of subsequent On times that ill occur for the remainder of the bre cycle.
Setting or adjusting passwords
The DBC has t o pass ords that can be set (to any number up to 4 digits) to prevent unauthorized access
to programming section of the list. Pass ords are default set to “0” hich allo s free access. FUNC 14 screen is
used to set pass ord for the "USER" Section and FUNC XXX (see Function List) for the "SECURED" Section. If the
pass ord is forgotten after being set, there is no ay of recovering it. The controller must have the factory
settings restored by simultaneously pressing and holding the “+” and “-” keys hile po ering-up the bre er.
Hold both keys until the display begins to count, then release them.

Page 8
TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems
encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.
• Inspection, testing, and repair of electrical equipment should be performed only by qualified service
personnel.
• All electronic components have 120 - 240 volt ac and lo 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 ill normally be
permanent. If an intermittent condition is encountered, the cause ill likely be a s itch contact or
a loose connection at a terminal or crimp.
• Solenoid removal requires interrupting the ater supply to the valve. Damage may result if
solenoids are energized for more than ten minutes ithout a supply of ater.
• The use of t o renches is recommended henever plumbing fittings are tightened or loosened.
This ill help avoid t ists and kinks in the tubing.
• Make certain that all plumbing connections are sealed and electrical connections tight and isolated.
• This bre er is heated at all times. Keep a ay from combustibles.
W RNING
• Exercise extreme caution hen servicing electrical equipment.
• Disconnect the bre er from the po er source hen servicing, except hen electrical tests are
specified.
• Follo recommended service procedures.
• Replace all protective shields or safety notices.
Equipment ill not operate.
Bre cycle ill not start.
Probable Cause Remedy
1. No po er or incorrect voltage.
1. Server or funnel not present, tank
not up to temperature.
2. No ater
3. Water strainer
Check the terminal block for 120
volts across the black and hite
terminals on 120/208 or 120/240
volt bre ers.
(B) Check circuit breakers or fuses.
Check plumbing and shut-off valves
(A) Direction of flo arro must be
pointing to ards bre er.
(B) Remove the strainer and check
for obstructions. Clear or replace.
Problem
32248 100500

Page 9
Bre cycle ill not start (cont.)
Automatic refill ill not operate
Beverage level ill not adjust
(Selector s itch in any position)
Remedy
4. Start s itch
5. Dispense valve
6. Bre selector s itch
7. Defective DBC
1. No ater
2. Water strainer
3. Solenoid valve
4. Overflo protection s itch
5. Defective DBC
1. Bre Selector s itch
Refer to Service - Start s itch for
testing procedures. See page 30
Refer to Service - Dispense valve for
testing procedures. See page 20
Refer to Service - Bre selector
s itch for testing procedures. See
page 16
Refer to Service - DBC Controller for
testing procedures. See page 19
Check plumbing and shut-off valves.
(A) Direction of flo arro must be
pointing to ards bre er.
(B) Remove the strainer and check
for obstructions. Clear or replace.
Refer to Service - Solenoid valve for
testing procedures. See page 29
Refer to Service - Overflo protec-
tion s itch for testing procedures.
See page 26
Refer to Service - DBC Controller for
testing procedures. See page 19
Refer to Service - Selector s itch for
testing procedures. See page 16
Probable Cause
TROUBLESHOOTING (cont.)
Problem
32248 100500

Page 10
Water flo s into tank continuously
.
Water from tank is not hot
1. Solenoid valve
2. Defective DBC
3. Overflo protection s itch
1. Limit thermostat
C UTION - Do not eliminate or by-
pass limit thermostat. Use only
B.O.M. part #23717.0001
2. Defective DBC
3. Tank heaters
4. Tank not filled ith ater, dry
plug protection
Refer to Service - Solenoid valve for
testing procedures. See page 29
Refer to
Service - DBC Controller for
testing procedures. See page 19
Refer to
Service - Overflo protec-
tion s itch for testing procedures.
See page 26
Refer to Service -Limit thermostat
for testing procedures. See page 25
Refer to Service - DBC Controller for
testing procedures. See page 19
Refer to Service - Tank heaters for
testing procedures. See page 31
Remedy
TROUBLESHOOTING (cont.)
Probable CauseProblem
32248 100500

Page 11
TROUBLESHOOTING (cont.)
Spitting or unusual steaming from
sprayhead or airvents.
Inconsistent beverage level in
server.
Consistently high or lo beverage
level in server.
Dripping from sprayhead.
Water overflo s server.
1. Lime build-up
C UTION - Tank and tank compo-
nents should be delimed regularly
depending on local ater conditions.
Excessive mineral build-up on stain-
less steel surfaces can initiate cor-
rosive reactions resulting in serious
leaks.
1. Strainer
2. Improper ater pressure
3. Dispense valve
4. Bypass valve
1. Volume adjustment needed
1. Dispense valve
1. Bypass valve
Inspect the tank assembly for ex-
cessive lime deposits. Delime as re-
quired.
(A) Direction of flo arro must be
pointing to ards the bre er.
(B) Remove the strainer and check
for obstructions. Clear or replace.
Check the operating ater pressure
to the bre er. It must be bet een 20
and 90 psi (138 and 620 kPa).
Refer to Service - Dispense valve for
testing procedures. See page 20
Refer to Initial Set-Up on page 4 step
#7. For test procedure see page 15
Refer to Setting or Adjusting Batch
Volumes, page 7
Refer to Service - Dispense valve for
testing procedures. See page 20
Refer to Initial Set-Up on page 4 step
#7. For test procedures see page 15
Probable Cause RemedyProblem
32248 100500

Page 12
TROUBLESHOOTING (cont.)
Water overflo s filter (cont.)
Beverage overflo s server.
Weak beverage
2. Type of paper filters
3. No sprayhead
1. Beverage left in server
2. Volume adjustment needed
3. Dispense valve
1. Type of paper filters
2. Coffee
3. Sprayhead
4. Funnel loading
5. Water temperature
BUNN® paper filters should be used
for proper extraction.
Check sprayhead
The bre cycle should be started
only ith an empty server under the
funnel.
Refer to Setting or Adjusting Batch
Volumes, page 7
Refer to
Service - Dispense valve for
testing procedures. See page 20
BUNN® paper filters should be used
for proper extraction.
A sufficient quantity of fresh drip or
regular grind should be used for
proper extraction.
B.O.M. Sprayhead #01082.0002
should be used to properly et the
bed of ground coffee in the funnel.
The BUNN® paper filter should be
centered in the funnel and the bed of
ground coffee leveled by gentle shak-
ing.
Empty the server, remove its cover.
Place empty funnel over the server
entrance, ith ON/OFF s itch in the
"ON" position press the start s itch
and release it. Check the ater tem-
perature immediately belo the
sprayhead ith a thermometer. The
reading should not be less than 195°
F.
Problem Probable Cause Remedy
32248 100500

Page 13
TROUBLESHOOTING (cont.)
Bre er is making unusual noises.
Server ill not heat
1. Solenoid valve
2. Plumbing lines
3. Water supply
4. Tank heaters
1. Circuit breaker
2. Receptacle Contacts
3. Transformer
4. Rectifier
RemedyProbable CauseProblem
The nut on back of the solenoid
must be tight or it ill vibrate during
operation
Plumbing lines should not be rest-
ing on the counter top.
(A) The bre er must be connected
to a cold ater line.
(B) Water pressure to the bre er
must not be higher than 90 psi (620
kPa). Install a regulator if necessary
to lo er the orking pressure to
approximately 50 psi (345 kPa).
Remove and clean lime off tank heat-
ers.
A) Check and reset if necessary
B) Refer to Service - Circuit breaker
for test procedures. See page 18
Clean or replace. See page 27
Refer to Service - Transformer for
test procedures. See page 32
Refer to Service - Rectifier for test
procedures. See page 28
32248 100500

Page 14
CAUTION
CAUTION
DISCARDDECANTER
DISCARD DECANTER
IF:
IF:
.CRACKED
.CRACKED
.SCRATCHED
.SCRATCHED
.BOILEDDRY
.BOILED DRY
.HEATEDWHENEMPTY
.HEATED WHEN EMPTY
.USEDONHIGHFLAME
.USED ON HIGH FLAME
.OREXPOSEDELECTRIC
.OR EXPOSED ELECTRIC
ELEMENTS
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
FAILURE TO COMPLY RISKS INJURY
PN:658
PN:658
1985BUNN-O-MATICCORPORATION
1985BUNN-O-MATIC CORPORATION
FUNNELCONTENTS
FUNNEL CONTENTS
AREHOT
ARE HOT
!
!
CAUTIONHOTWATER
DISCONNECTFROMPOWERSOURCE
BEFOREREMOVALOFANYPANELOR
REPLACEMENTOFANYCOMPONENT!
WARNING
!
The top cover is attached ith four #4-40 slotted
head scre s.
The front inspection panel is attached ith eleven
#6-32 slotted head scre s.
The server platform is attached ith four #6-32
slotted head scre s.
Contents
Bre Selector S itches ........................................16
Bypass Solenoid Valves ........................................ 15
Circuit Breakers .................................................... 18
DBC Display .......................................................... 19
Dispense Solenoid Valves ..................................... 20
Funnel Sensor S itch ........................................... 21
Funnel Lock Solenoid ........................................... 22
Grinder Interface Circuit Board .............................23
Grinder Selector S itch ........................................ 24
Limit Thermostat .................................................. 25
Overflo Protection S itch ..................................26
Receptacles (Spring Contacts) ............................. 27
Rectifiers .............................................................. 28
Refill Solenoid Valve ............................................. 29
Start/Stop S itches .............................................. 30
Tank Heaters......................................................... 31
Transformer .......................................................... 32
Wiring Diagram .................................................... 34
SERVICE
This section provides procedures for testing and
replacing various major components used in this
bre er should service become necessary. Refer to
Troubleshooting for assistance in determining the
cause of any problem.
W RNING - Inspection, testing, and repair of electri-
cal equipment should be performed only by qualified
service personnel. The bre er should be unplugged
hen servicing, except hen electrical tests are re-
quired and the test procedure specifically states to
plug in the bre er.
COMPONENT CCESS
W RNING - Unplug the bre er before the removal of
any panel or the replacement of any component.
All components are accessible by the removal of
the top cover, front inspection panel and server
platform.
FIG. 1 COMPONENT ACCESS P2214
32248 100500

Page 15
SERVICE (cont.)
Location:
The bypass valves are located inside the right front
and the center front of the hood.
Test Procedures:
1. Disconnect the bre er from the po er source and
place 1.5 or 1.75 gallon server under the funnel.
2. Check the ater level in the tank to confirm that it
is ithin 1/2" from the top of the tank.
3. Connect the bre er to the po er source.
4. Check the bypass valve for coil action. Place the
ON/OFF s itch in the "ON" position, press and
release the BREW s itch. Listen carefully in the
vicinity of the bypass valve for a "clicking" sound as
the coil magnet attracts and repels the plunger.
5. Disconnect the bre er from the po er source.
If the sound is heard as described, there may be a
blockage in the bypass valve or the ater line to the
sprayhead. Remove the bypass valve and inspect for
ear, and remove aterborne particles.
If the sound is not heard as described, proceed to #6.
P2232
P774
LEFT AND RIGHT VALVE
FIG. 2 BYPASS SOLENOID VALVE
BYP SS SOLENOID V LVE
FIG. 3 BYPASS VALVE TERMINALS
WHI to Funnel Lock Indicator
and Bre Solenoid
WHI/ORN to DBC J1-11 or
WHI/YEL to DBC J1-13
32248 031201
6. Connect the voltmeter lead ends to the bypass
valve coil terminals. Connect the bre er to the
po er source. With the selector s itch in the 1.5
or 1.75 gallon position, place "ON/OFF" S itch in
the "ON" position. Press and release the bre
s itch. The indication must be 120 volts ac for
three ire 120/208 volt models and three ire
120/240 volt models.
7. Disconnect the bre er from the po er source.
If voltage is present as described, but no coil action is
observed, nor "clicking" heard, bypass valve is defec-
tive. Replace valve and test again to verify repair.
If voltage is not present as described, refer to Wiring
Diagrams and check the bre er iring harness. Also
check the control board for proper operation. See
Pages 23 through 27.
Removal and Replacement:
1. Remove the ires from the bypass valve.
2. Drain enough ater from the tank so bypass valve
is above the ater level
3. Remove ater lines from bypass valve.
4. Remove the t o nuts retaining the bypass valve
inside the hood and remove bypass valve.
5. Remove hose barb fitting and attach to ne by-
pass valve.
6. Install ne bypass valve ith hose barb fitting.
7. Reconnect the ater tubes and the ires to the
bypass valve.
8. Refer to Fig. 3 hen reconnecting the ires.

Page 16
SERVICE (cont.)
BREW SELECTOR SWITCH
Location:
The bre selector s itches are located in the
front left and right side of the hood.
Test Procedure:
Timer: Left or Right
1. Disconnect the bre er from the po er supply.
2. Separate the connector on the selector s itch
harness from the bre timer circuit board.
3. Carefully slide the plastic cover off of the connec-
tor from the s itch harness.
4. Check for continuity across the pink and tan ires
on the connector hen the s itch is in the 1/2
gallon position. Continuity must not be present in
any other s itch position.
5. Check for continuity across the pink ire and gray
ire hen the s itch is in the 1 gallon position.
Continuity must not be present in any other posi-
tion.
6. Reattach the connector to the bre timer circuit
board.
Grinder Interface: Left or Right:
7. Disconnect the gray and tan ires on the selector
s itch from the gray and tan ires on the interface
socket.
8. Disconnect the pink ire on the selector s itch
from the grinder s itch.
9. Check for continuity across the pink ire and tan
ire on the selector s itch hen the s itch is in
the 1/2 gallon position. Continuity must not be
present in any other position.
10. Check for continuity across the pink ire and gray
ire on the selector s itch hen the s itch is in
the 1 gallon position. Continuity must not be
present in any other position.
11. Reconnect the gray and tan ire on the selector
s itch to the gray and tan ires on the interface
socket.
12. Reconnect the pink ire on the selector s itch to
the grinder s itch.
Bypass Valve: Left or Right
13. Disconnect the hite/violet on the selector s itch
from the bypass valve coil and disconnect the
hite/red from the dispense valve coil.
14. Check for continuity across the hite/violet and
the hite/red ires hen 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 posi-
tion.
15. Reconnect the hite/violet to the bypass valve coil
and hite/red to the dispense valve coil.
FIG. 4 BREW SELECTOR SWITCH P2214
CAUTION
CAUTION
DISCARDDECANTER
DISCARD DECANTER
IF:
IF:
.CRACKED
.CRACKED
.SCRATCHED
.SCRATCHED
.BOILEDDRY
.BOILED DRY
.HEATEDWHENEMPTY
.HEATED WHEN EMPTY
.USEDONHIGHFLAME
.USED ON HIGH FLAME
.OREXPOSEDELECTRIC
.OR EXPOSED ELECTRIC
ELEMENTS
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
FAILURE TO COMPLY RISKS INJURY
PN:658
PN:658
1985BUNN-O-MATICCORPORATION
1985BUNN-O-MATIC CORPORATION
FUNNELCONTENTS
FUNNEL CONTENTS
AREHOT
ARE HOT
!
DISCONNECTFROMPOWERSOURCE
BEFOREREMOVALOFANYPANELOR
REPLACEMENTOFANYCOMPONENT!
WARNING
!
32248 100500

Page 17
P2233
FIG. 5 BREW SELECTOR SWITCH TERMINALS
BREW SELECTOR SWITCH (cont.)
SERVICE (cont.)
Removal and Replacement:
1. Disconnect the connector on the selector s itch
harness from the DBC controller.
2. Disconnect ires from the selector s itch, inter-
face socket and dispense valve.
3. Loosen the set scre on the s itch knob.
4. Remove the 9/16" nut and asher holding the
s itch to the hood.
5. Remove the s itch.
6. Install the ne s itch. The positioning tab must be
in the hole in the hood for proper s itch and knob
alignment.
7. Install the knob so that the arro points to the 1-
1/2 or 1-3/4 gallon position hen the s itch is
turned to the full right position.
8. Reattach the connector to the DBC controller.
9. Refer to Fig. 5 hen reconnecting the ires.
32248 100500

Page 18
CIRCUIT BRE KERS
CAUTION
CAUTION
DISCARDDECANTER
DISCARD DECANTER
IF:
IF:
.CRACKED
.CRACKED
.SCRATCHED
.SCRATCHED
.BOILEDDRY
.BOILED DRY
.HEATEDWHENEMPTY
.HEATED WHEN EMPTY
.USEDONHIGHFLAME
.USED ON HIGH FLAME
.OREXPOSEDELECTRIC
.OR EXPOSED ELECTRIC
ELEMENTS
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
FAILURE TO COMPLY RISKS INJURY
PN:658
PN:658
1985BUNN-O-MATICCORPORATION
1985BUNN-O-MATIC CORPORATION
FUNNELCONTENTS
FUNNEL CONTENTS
AREHOT
ARE HOT
!
!
CAUTIONHOTWATER
Location:
The circuit breakers are located on the lo er front
of the bre er, mounted on the server platform just
above the spring contact receptacle assembly.
Test Procedures:
1. Disconnect the dispenser from the po er source.
2. Remove the ires from the circuit breaker.
3. Check for continuity bet een the terminals. Con-
tinuity must be present bet een the terminals.
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.
SERVICE (cont.)
FIG. 6 CIRCUIT BREAKERS P2214
FIG. 7 CIRCUIT BREAKER TERMINALS P1330
BLU/BLK to Transformer #12
BLU/BLK to Rectifier "AC"
32248 100500
Removal and Replacement:
1. Remove the ires 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 ne circuit breaker into the opening in
the server platform until the clips snap into posi-
tion.
4. Reconnect the ires to the circuit breaker.
5. Refer to Fig. 7 hen reconnecting the ires.

Page 19
SERVICE (cont.)
DBC DISPL Y
32248 100500
CAUTION
DISCARDDECANTER
DISCARD DECANTER
IF:
IF:
.CRACKED
.CRACKED
.SCRATCHED
.SCRATCHED
.BOILED DRY
.BOILED DRY
.HEATED WHEN EMPTY
.HEATED WHEN EMPTY
.USED ON HIGHFLAME
.USED ON HIGH FLAME
.OR EXPOSED ELECTRIC
.OR EXPOSED ELECTRIC
ELEMENTS
ELEMENTS
FAILURETOCOMPLYRISKSINJURY
FAILURE TO COMPLY RISKS INJURY
PN:658
PN:658
1985BUNN-O-MATICCORPORATION
1985BUNN-O-MATIC CORPORATION
FUNNELCONTENTS
FUNNEL CONTENTS
AREHOT
ARE HOT
!
!
CAUTIONHOTWATER
DISCONNECTFROMPOWERSOURCE
BEFOREREMOVALOFANYPANELOR
REPLACEMENTOFANYCOMPONENT!
WARNING
!
FIG. 8 DBC DISPLAY P2214
Location:
The DBC Display is located inside the hood in the
upper center of the control panel.
Test Procedures:
1. Disconnect the dispenser from the po er source.
Removal and Replacement:

Page 20
If continuity is present as described, reconnect the
ires 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 bre er to po er source. Place the ON/OFF"
s itch in the "ON" position, press and release the
start s itch. 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 bre er from the po er source.
If the sound is heard as described, there may be a
blockage in the dispense valve or the ater line to the
dispense valve. Remove the dispense valve and in-
spect for ear, and remove aterborne particles.
If the sound is not heard as described, replace the
dispense valve.
Removal and Replacement:
1. Drain enough ater from the tank so the dispense
valves are above the ater level.
2. Disconnect ires and ater tubes from dispense
valve.
3. Remove dispense valve from the sprayhead panel.
4. Install ne dispense valve.
5. Reconnect the ater lines and the ires to the
dispense valve.
6. Refer to Fig. 11 hen reconnecting ires.
P782
FIG. 11 DISPENSE VALVE TERMINALS
DISPENSE SOLENOID V LVES
Location:
Dispense valves are located inside the hood in
the center of each sprayhead panel.
Test Procedures:
1. Disconnect the bre er from the po er source.
2. Disconnect the ires from the right dispense valve
and check the voltage across the hite ire and
hite/red ire. Connect bre er to the po er
source. Place the "ON/OFF" s itch in the "ON"
position, press and release the start s itch. The
indication must be 120 volts ac for three ire 120/
208 volt models and three ire 120/240 volt
models.
3. Disconnect bre er from the po er source.
4. Disconnect the ires from the left dispense valve
and check voltage across the hite ire and the
hite/green ire. Connect the bre er to the po er
source. Place the "ON/OFF" s itch in the "ON"
position, press and release the start s itch. The
indication must be 120 volts ac for three ire 120/
208 volt models and three ire 120/240 volt
models.
5. Disconnect bre er from po er source.
If voltage is present as described in steps 2 & 4
proceed to #6.
If voltage is not present as described, refer to the
iring diagrams and check the bre er iring harness.
6. Check for continuity across the dispense valve coil
terminals.
FIG. 10 DISPENSE VALVES P2232
SERVICE (cont.)
32248 100500
WHI to right By-pass Solenoid
WHI/RED to DBC Controller J1-1
WHI to left By-pass Solenoid
WHI/GRN to DBC Controller J1-9