Bunn Coffee Maker Titan Dual Service Manual
TITAN DUAL™
TITAN SINGLE™
SERVICE & REPAIR MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
41747.0000A 11/08 ©2008 Bunn-O-Matic Corporation
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.
BrewWISE, BrewLOGIC, BrewMETER, BrewWIZARD, Bunn Gourmet, BUNN Gourmet Ice, BUNN Pour-O-Matic, BUNN,
Bunn-OMatic, Bunn-O-Matic, BUNNlink, BUNNserve, BUNNSERVE, BUNN Espress, DBC, Dr. Brew, Dual, EasyClear, EasyGard, Easy Pour, FlavorGard, Gourmet Ice, Gourmet Juice, High Intensity, IMIX, Infusion Series, Intellisteam, Quality Beverage Equipment Worldwide, The Mark of Quality in Beverage Equipment Worldwide, My Café, PowerLogic, Safety-Fresh,
Scale-Pro, Single, Smart Funnel, Smart Hopper, SmartWAVE, Soft Heat, SplashGard, System III, ThermoFresh, 392, AutoPOD, AXIOM, Beverage Profit Calculator, Beverage Bar Creator, BUNNsource, Coffee At Its Best, Cool Froth, Digital Brewer
Control, Nothing Brews Like a BUNN, Pouring Profits, Pulse Wave, Signature Series, Silver Series, Smart Heat, Tea At Its
Best, The Horizontal Red Line, Titan, Ultra, are either trademarks or registered trademarks of Bunn-O-Matic Corporation.
Page 2
41747 112008
INTRODUCTION
This equipment will brew coffee into an awaiting server or airpot. The brewer may have an auxillary hot water
faucet. It is only for indoor use on a sturdy and level counter or shelf. Please install in an area where there are
no water jet devices.
This brewer can be programmed to adjust different functions of the brewing process, such as brew temperature, brew volumes, bypass percentages, pulse brew, etc. Other features are Energy Savings mode, Freshness
Timer and Clean Alert.
CONTENTS
Warranty .....................................................................................................................................2
Table of Contents ........................................................................................................................3
Troubleshooting ..........................................................................................................................4
Service Tools .............................................................................................................................15
Component Access ...................................................................................................................18
Control Board ......................................................................................................................18
Membrane Switch ................................................................................................................19
Dispense and Bypass Valves................................................................................................20
Refill Valves .........................................................................................................................21
Tank Heaters ........................................................................................................................22
Temperature Probe ..............................................................................................................23
Limit Thermostats ...............................................................................................................22
Contactor .............................................................................................................................23
Main Power Switch ..............................................................................................................24
Schematic (Wiring Diagram) .....................................................................................................25
Page 3
41747 112608
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,andrepairofelectricalequipmentshouldbeperformedonlybyqualiedservicepersonnel.
• Allelectroniccomponentshave120-240voltacandlowvoltagedcpotentialontheirterminals.Shortingof
terminals or the application of external voltages may result in board failure.
• Intermittentoperationofelectronic circuitboardsisunlikely.Boardfailurewillnormallybepermanent. If
an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a
terminal or crimp.
• Solenoidremovalrequiresinterruptingthewatersupplytothevalve.Damagemayresultifsolenoidsare
energized for more than ten minutes without a supply of water.
• Theuseoftwowrenchesisrecommendedwheneverplumbingttingsaretightenedorloosened.Thiswill
help to avoid twists and kinks in the tubing.
• Makecertainthatallplumbingconnectionsaresealedandelectricalconnectionstightandisolated.
• Thisbrewerisheatedatalltimes.Keepawayfromcombustibles.
WARNING – • Exerciseextremecautionwhenservicingelectricalequipment.
• Unplugthebrewerwhenservicing,exceptwhenelectricaltestsarespecied.
• Followrecommendedserviceprocedures.
• Replaceallprotectiveshieldsorsafetynotices.
Page 4
41747 112608
TROUBLESHOOTING (cont.)
PROBABLE CAUSE REMEDYPROBLEM
Temperature Too Low
Heating Time Too Long
Fill Time Too Long
Temp Sensor Out Of Range, Check
For Bad Connections
1. Water temperature in the tank
does not meet the ready temperature.
1. Tank Heater failure.
2. Control Board/Thermistor failure
1. Water shut off to brewer
2. Inlet Solenoid failure
3. Control Board failure
4. ON/OFF switch is OFF
1. Temperature Sensor Probe
wire(s) broken or not making connection
A) Wait for the brewer to heat to the
proper temperature.
B) Disable the BREW LOCKOUT
function. Refer to Programming
Manual for procedure.
Service required
Service required
Check water supply shut-off
Service Required
Service Required
Turn switch ON
Check wire and connection of both
black and white wires of temperature
probe.
Temp Sensor Out Of Range, Check
Wire For Shorts
Equipment will not operate
1. Temperature Sensor Probe
wire(s) shorted to housing or to
each other.
1. No power or incorrect voltage
Check to confirm that wire(s) are
not pinched between two surfaces
or connected to each other.
Measure the voltage at the terminal
block and confirm that it matches
the voltage specified on the brewer
data plate withing +/- 10%.
Page 5
41747 112608
TROUBLESHOOTING (cont.)
PROBLEM
Brew cycle will not start
PROBABLE CAUSE REMEDY
1. No water
Check plumbing and shut-off
valves
2. No power or incorrect voltage to
the brewer
3. ON/OFF switch
Check for voltage across the terminals at the terminal block.
Test the ON/OFF switch. Refer
to the test switch procedures on
page 17.
4. Brew switch
Test the BREW switch. Refer to the
test switch procedures on page
17.
5. Brew valve
Test the brew valve. Refer to the test
outputs procedures on page 15.
6. Control Board
Substitute a control board known
to be in good working order.
Page 6
41747 112608
TROUBLESHOOTING (cont.)
PROBLEM
Automatic refill will not operate
or display shows FILL TIME TOO
LONG
PROBABLE CAUSE REMEDY
1. No water
Check plumbing and shut-off
valves
2. Refill valve
Remove the strainer and check for
obstructions. Clear or replace.
3. Refill probe or Sensitivity setting
Check the sensitivity setting. Refer
to the REFILL function in Programmimg Manual. If the left three digit
number is less than the right number, the machine “thinks” it is full and
the refill valve should be off. If the left
number is larger than the right, then
the refill valve will automatically be
turned on to fill the tank. The right
number is the threshold setting and
can be adjusted to compensate for
extreme water conditions: very pure,
low conductance water requires a
higher setting, while high mineral
content, high conductance water
requires a lower setting. Note that
the left number changes from a high
value when water is NOT touching
the refill probe to a low valve when
water IS touching the probe. For
best operation, the right number
should be set to a value midway
between these low and high numbers. Before changing the setting,
confirm that the refill probe is free
of scale buildup and the connection
to it is secure. Test the refill valve.
Refer to the test outputs procedures
on page 15.
Page 7
41747 112608
TROUBLESHOOTING (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Automatic refill will not operate or
display shows FILL TIME TOO LONG
(Continued)
Refill valve – Disconnect the brewer
from the power source and remove
wires from refill valve coil. Check
for continuity across the terminals
of the solenoid coil. If continuity is
not present, replace the refill valve.
If continuity is present, the coil may
be stuck closed. Shut water off to
brewer. Press the ON/OFF switch to
turn off the brewer. Open the faucet
and drain water down in the tank
until flow stops or slows to a trickle.
Attach a voltmeter to the terminals
of the refill solenoid. Connect the
brewer to the power source. Press
the ON/OFF switch to turn the brewer
on. Within five seconds, voltage
should be present at the solenoid
terminals. If voltage is not present,
refer to the wiring schematic and
check the wiring harness.
4. Control Board
5. ON/OFF Switch
6. Overflow Safety Switch
Substitute a control board known
to be in good working order.
ON/OFF switch must be ON for the
refill circuit to operate. Turn ON.
When this condition occurs, the
brewer will display OVERFLOW
CUP FULL. EMPTY CUP. The reason
for overfilling could be a defective
refill valve, an incorrect sensitivity
setting, (see above) or boiling.
Page 8
41747 112608
TROUBLESHOOTING (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Water flows into tank continuously
with power removed from brewer.
1. Refill valve
2. Refill probe or sensitivity setting
Foreign material lodged in valve,
holding it in open state.
Check the sensitivity setting. Refer
to the REFILL function in Programming Manual. If the left three digit
number is less than the right number, the machine “thinks” it is full and
the refill valve should be off. If the
left number is larger than the right,
then the refill valve will automatically
be turned on to fill the tank. The right
number is the threshold setting and
can be adjusted to compensate for
extreme water conditions: very pure,
low conductance water requires a
higher setting, while high mineral
content, high conductance water
requires a lower setting. Note that
the left number changes from a high
value when water is NOT touching
the refill probe to a low valve when
water IS touching the probe. For
best operation, the right number
should be set to a value midway
between these low and high numbers. Before changing the setting,
confirm that the refill probe is free
of scale buildup and the connection
to it is secure.
3. Control Board
Page 9
Substitute a control board known
to be in good working order.
41747 112608
Loading...