BrewWISE®
DBC® BREWERS
WITH SMART FUNNEL®
SERVICE & REPAIR MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
41746.0000D 04/10 ©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.
AutoPOD, AXIOM, BrewLOGIC, BrewMETER, Brew Better Not Bitter, BrewWISE, BrewWIZARD, BUNN Espress, BUNN Family Gourmet, BUNN Gourmet, BUNN Pour-O-Matic, BUNN, BUNN with the stylized red line, BUNNlink, Bunn-OMatic, Bunn-O-Matic, BUNNserve, BUNNSERVE with the stylized wrench design, Cool Froth, DBC, Dr. Brew stylized Dr. design, Dual, Easy Pour, EasyClear, EasyGard, FlavorGard, Gourmet Ice, Gourmet Juice, High Intensity, iMIX, Infusion Series, Intellisteam, My Café, PowerLogic, Quality Beverage Equipment Worldwide, Safety-Fresh, savemycoffee.com, Scale-Pro, Silver Series, Single, Smart Funnel, Smart Hopper, SmartWAVE, Soft Heat, SplashGard, The Mark of Quality in Beverage Equipment Worldwide, ThermoFresh, 392, A Partner You Can Count On, Air Brew, Air Infusion, Beverage Bar Creator, Beverage Profit Calculator, Brew better, not bitter., BUNNSource, Coffee At Its Best, Cyclonic Heating System, Digital Brewer Control, Nothing Brews Like a BUNN, Pouring Profits, Respect Earth, Respect Earth with the stylized leaf and coffee cherry design, Signature Series, Tea At Its Best, Phase Brew, The Horizontal Red Line, Titan, trifecta, Ultra, Velocity Brew are either trademarks or registered trademarks of Bunn-O-Matic Corporation.
Page 2 |
41746 041410 |
|
|
TABLE OF CONTENTS |
Warranty...................................................................................................................................... |
2 |
Table of Contents......................................................................................................................... |
3 |
Troubleshooting........................................................................................................................... |
4 |
Service Tools............................................................................................................................. |
15 |
Component Access.................................................................................................................... |
19 |
Control Board....................................................................................................................... |
19 |
Membrane Switch................................................................................................................ |
20 |
Dispense and Bypass Valves................................................................................................ |
21 |
Refill Valves.......................................................................................................................... |
22 |
Tank Heaters......................................................................................................................... |
24 |
Temperature Probe............................................................................................................... |
25 |
Limit Thermostats................................................................................................................ |
25 |
Warmer Elements................................................................................................................. |
26 |
Master Power Switch........................................................................................................... |
26 |
SH Server Timer................................................................................................................... |
27 |
Schematic (Wiring Diagram)..................................................................................................... |
28 |
Page 3 |
41746 040210 |
|
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 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.
WARNING
•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.
Screen Displayed
OVERFLOW CUP FULL. EMPTY CUP
SERVER NOT IN PLACE
(SH Models only)
Possible Cause |
Troubleshooting Procedures |
1. Overflow cup is full of water. This could be caused by boiling. Refer to
SET TEMP and REFILL sections in Programming Manual.
1.Soft Heat Server not correctly positioned on base.
2.Not using a Soft Heat Server, and the SERVER DETECT function is activated (on).
Empty cup. Correct cause and retry.
Position the server so that the connector pins on the server make contact with connector on the brewer.
Disable the SERVER DETECT function.
Page 4 |
41746 112008 |
|
TROUBLESHOOTING (cont.)
Screen Displayed
NO FUNNEL PRESENT
TEMPERATURE
TOO LOW
CHECK FUNNEL FOR FRESH COFFEE
PRESS BREW
TO BREW ANYWAY
BREW STOPPED! FUNNEL REMOVED?
TO FINISH:
PRESS BREW
TO CANCEL
PRESS ON/OFF
Possible Cause
1.SMART FUNNEL not fully inserted into the funnel rails.
2.Not using a SMART FUNNEL, and the FUNNEL DETECT function is activated (on).
1. Water temperature in the tank does not meet the SET READY
TEMPERATURE.
1. Brew funnel was not removed after the previous brew cycle was finished.
1. Brew funnel was moved out of position after the brew cycle was started.
Troubleshooting Procedures
Position the funnel so that the sensor is directly beneath the sensor coil on the brewer.
Disable the FUNNEL DETECT function.
(a)Wait for the brewer to heat to the proper temperature.
(b)Disable the BREW LOCKOUT function.
Remove funnel, check contents, and insert back into the funnel rails.
OR
Press BREW to start a brew cycle without removing the funnel.
To resume brewing, correctly position the funnel and press BREW again. The brew cycle will resume from the point it was interrupted.
OR
Press ON/OFF to terminate the cycle.
Page 5 |
41746 112008 |
|
TROUBLESHOOTING (cont.)
Screen Displayed
BREW STOPPED! SERVER REMOVED?
TO FINISH:
PRESS BREW
TO CANCEL
PRESS ON/OFF
BREW STOPPED!
IS SWITCH OFF?
TO FINISH:
PRESS BREW
Possible Cause
1. Soft Heat Server was moved out of position after the brew cycle was started.
Troubleshooting Procedures
To resume brewing, correctly position the Soft Heat Server and press BREW again. The brew cycle resumes from the point it was interrupted.
OR
1. ON/OFF switch was pressed after the brew cycle was started.
Press ON/OFF to terminate the brew cycle.
To resume brewing, press BREW again. The brew cycle resumes form the point it was interrupted.
OR
Press ON/OFF to terminate the brew cycle.
TO CANCEL
PRESS ON/OFF
HEATING TIME |
1. |
Tank Heater failure |
|
TOO LONG |
|
|
|
|
|
2. |
Triac Failure |
|
|
||
|
|
||
CHECK HEATING |
3. Control Board/Thermistor failure |
|
CIRCUIT |
||
|
Service Required. See TANK HEAT-
ERS.
Service Required. See
Service Required. See CONTROL
BOARD
Page 6 |
41746 112008 |
|
TROUBLESHOOTING (cont.)
Screen Displayed
FILL TIME TOO
LONG
CHECK WATER
SUPPLY
TEMP SENSOR
OUT OF RANGE
CHECK FOR BAD
CONNECTIONS
TEMP SENSOR
OUT OF RANGE
CHECK WIRE FOR
SHORTS
Possible Cause
1.Water shut off to brewer
2.Inlet Solenoid Valve failure
3.Control Board Failure
1. Temperature Sensor Probe wire(s) broken or not making connection.
1. Temperature Sensor Probe wire(s) shorted to housing, or to each other.
Troubleshooting Procedures
Check water supply shut-off
Service required. See REFILL VALVE.
Service required. See CONTROL BOARD.
Check wire and connection of both black and white wires of temperature probe.
Check to confirm that wire(s) are not pinched between two surfaces or connected to each other.
Page 7 |
41746 112008 |
|
TROUBLESHOOTING (cont.)
Problem |
Possible Cause |
Troubleshooting Procedure |
Equipment will not operate. |
1. No power or incorrect voltage. |
Brew cycle will not start. |
1. |
No water |
|
2. |
ON/OFF switch |
Measure the voltage at the terminal block and confirm that it matches the voltage specified on the brewer data plate within +/- 10%.
Check plumbing and shut-off valves
Test the ON/OFF switch. Refer to the switch test procedures in SERVICE TOOLS section.
3. Brew switch |
Test the BREW switch. Refer to the |
|
switch test procedures in SERVICE |
|
TOOLS section. |
4. Brew Valve
5. Electronic Control Board
Automatic refill will not operate 1. No water or display shows FILL TIME TOO
LONG
2. Water strainer/flow control
(.750 GPM)
Test the Brew valve. Refer to Testing Individual Components in SERVICE TOOLS section.
Substitute a control board known to be in good working order.
Check plumbing and shut-off valves.
(A)Direction of flow arrow must be pointing towards direction of water flow.
(B)Remove the strainer/flow control and check for obstructions. Clear or replace.
Page 8 |
41746 112008 |
|
TROUBLESHOOTING (cont.)
Problem |
Possible Cause |
Troubleshooting Procedure |
Automatic refill will not operate or display shows FILL TIME TOO LONG (cont.)
3. Refill Probe or Sensitivity Setting
Check the sensitivity setting. Refer to Refill function. 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 value 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 changingthesetting,confirmthatthe refill probe is free of scale buildup and the connection to it is secure.
4. |
Refill Valve |
Test the Refill valve. Refer to Testing |
|
|
Individual Components. |
5. |
Overflow Protection Switch |
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. |
6. |
Electronic Control Board |
Substitute a control board known to |
|
|
be in good working order. |
Water flows into tank continuously 1. Refill valve |
Foreign material lodged in valve, |
|
with power removed from brewer. |
|
holding it in open state. |
Page 9 |
41746 112008 |
|
TROUBLESHOOTING (cont.)
Power |
Possible Cause |
Troubleshooting Procedures |
Water flows into tank continuously with power applied to brewer.
1. Refill Probe or Sensitivity Setting
Check the sensitivity setting. Refer to Refill function. 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 value 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 changingthesetting,confirmthatthe refill probe is free of scale buildup and the connection to it is secure.
2. |
Electronic Control Board |
Water will not heat or display shows 1. |
Limit Thermostat |
HEATING TIME TOO LONG |
|
CAUTION - Do not eliminate or bypass limit thermostat. Use only replacement part #23717.0003.
2. Tank Heaters
Substitute a control board known to be in good working order.
Remove power from the brewer. Press reset button on limit thermostat. Then check for continuity through it.
Remove power from the brewer. Check for continuity through the tank heaters.
Page 10 |
41746 112008 |
|
TROUBLESHOOTING (cont.)
Problem |
Possible Cause |
Water will not heat or display shows |
3. Triac |
HEATING TIME TOO LONG (cont.) |
|
4. Electronic Control Board
Troubleshooting Procedures
Remove power from the brewer. Connect a voltmeter across one of the tank heaters. Reapply power to the brewer and refer to Testing Individual Components. If the full supply voltage is measured when the tank heater is turned on, and zero voltage is measured with the triac off, then the triac is good. If half the supply voltage is measured, the triac is defective. If very low, or zerovoltageismeasured,therecould be a defective triac or a defective control board.
Perform the above procedure for testing triacs. If the voltage measured is very low or zero, then substitute a control board known to be in good working order.
Spitting or unusual steaming from sprayhead or air vents. (Water too hot)
1. Triac |
Remove power from the brewer. |
|
Connect a voltmeter across one of |
|
the tank heaters. Reapply power |
|
to the brewer and refer to Testing |
|
Individual Components. If the full |
|
supply voltage is measured when |
|
the tank heater is turned on, and |
|
zero voltage is measured with the |
|
triac off, then the triac is good. If |
|
half the supply voltage is measured, |
|
the triac is defective. If very low, or |
|
zerovoltageismeasured,therecould |
|
be a defective triac or a defective |
|
control board. |
2. Lime Buildup
CAUTION - Tank and tank components should be delimed regularly depending on local water conditions. Excessive mineral buildup on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks.
Page 11
Inspect the tank assembly for excessive lime deposits. Delime as required.
41746 112008
TROUBLESHOOTING (cont.)
Problem |
Possible Cause |
Troubleshooting Procedures |
Spitting or unusual steaming from |
3. Electronic control board |
Perform the previous procedure |
sprayhead or air vents. (Water too |
|
for testing triacs. If the voltage |
hot) (cont.) |
|
measured is very low or zero, then |
|
|
substitute a control board known to |
|
|
be in good working order. |
Inconsistent beverage level in |
1. Strainer/flow control (.750 |
(A) Direction of flow arrow must be |
server. |
GPM) |
pointing towards the brewer. |
|
|
(B) Remove the strainer/flow control |
|
|
and check for obstructions. Clear or |
|
|
replace. |
|
2. Improper water pressure |
Check operating water pressure to |
|
|
the brewer. It must be between 20 |
|
|
and 90 psi (138 and 620 kPa). |
|
3. Brew Valve |
Test the Brew Valve. Refer to Testing |
|
|
Individual Components. Turn the |
|
|
valve on for 30 seconds and collect |
|
|
the water dispensed from the spray- |
|
|
head. Repeat the test several times |
|
|
to confirm a consistent volume of |
|
|
dispensed water. If not consistent, |
|
|
check the valve, tubing and spray- |
|
|
head for lime buildup. |
|
4. Bypass Valve |
If bypass is being used on the |
|
|
inconsistent brewing recipe, test |
|
|
the Bypass Valve. Refer to Testing |
|
|
Individual Components. Turn the |
|
|
valve on for 30 seconds and collect |
|
|
the water collected from the bypass |
|
|
opening. Repeat the test several |
|
|
times to confirm a consistent volume |
|
|
of dispensed water. If not consistent, |
|
|
check the valve, tubing and bypass |
|
|
opening for lime buildup. |
|
5. Lime buildup |
Inspect for lime buildup that could |
|
|
block the tank, tank fittings, tubing, |
|
|
valves and sprayhead. |
Page 12 |
41746 112008 |
|
TROUBLESHOOTING (cont.)
Problem |
Possible Cause |
Troubleshooting Procedures |
Consistently high or low beverage |
1. Brew Volume adjustment |
Adjust the brew volume as required |
level in server. |
|
to achieve the recommended volume |
|
|
for each brew cycle. |
Dripping from sprayhead. |
1. Brew Valve |
Repair or replace leaky valve. |
Water overflows filter. |
1. Type of paper filters |
BUNN paper filters should be used |
|
|
for proper extraction. |
|
2. No sprayhead |
Check sprayhead |
Beverage overflows server. |
1. Beverage left in server from previ- |
The brew cycle should be started |
|
ous brew |
only with an empty server under |
|
|
the funnel. |
|
2. Brew Volume adjustment |
Adjust the brew volume as required |
|
|
to achieve the recommended volume |
|
|
for each brew cycle. |
Weak beverage. |
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 |
ThecorrectB.O.M.sprayheadshould |
|
|
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
Page 13
Empty the server, remove its cover, and place the server beneath the sprayhead. Place empty funnel over the server entrance, with ON/OFF switch in the "ON" position press the start switch and release it. Check the water temperature immediately below the sprayhead with a thermometer. The reading should not be less than 195˚F (91˚C).
41746 112008
TROUBLESHOOTING (cont.)
Problem |
Possible Cause |
Troubleshooting Procedures |
|
Weak beverage (cont.) |
6. Incorrect Recipe |
Consider adjusting bypass percent- |
|
|
|
|
age, preinfusion, or pulse brew. |
|
|
|
Contact Bunn-O-Matic for sugges- |
|
|
|
tions. |
Brewer is making unusual noises. |
1. |
Solenoid (Inlet) |
The nut on back of the solenoid |
|
|
|
must be tight or it will vibrate during |
|
|
|
operation |
|
2. |
Plumbing lines |
Plumbing lines should not be resting |
|
|
|
on the counter top. |
|
3. |
Water Supply |
(A) The brewer must be connected |
|
|
|
to a cold water line. |
|
|
|
(B) Water pressure to the brewer |
|
|
|
must not be higher than 90 psi (620 |
|
|
|
kPa). Install a regulator if necessary |
|
|
|
to lower the working pressure to ap- |
|
|
|
proximately 50 psi (345 kPa). |
|
4. |
Tank Heaters. |
Remove and clean lime off tank |
|
|
|
heaters. |
Page 14 |
41746 112008 |
|
TROUBLESHOOTING (cont.)
SERVICE TOOLS
This function allows the testing of individual components and the ability to check switches for proper function. This function also tests the Soft Heat server's status on the brewer (in place or removed), and the funnel sensor coil's frequency (diagnostic tool for troubleshooting purposes only).
Testing individual components (outputs):
This will allow the operator to test the operation of individual components and outputs of the brewer. The components that can be individually tested are as follows:
SINGLE Brewers
Brew Valve
Bypass Valve
Funnel Lock (Optional)
Server (SH models only)
Refill Valve
Tank Heaters
Heater Contactor
DUAL Brewers
Left Brew Valve
Left Bypass
Left Funnel Lock (Optional)
Left Server (SH models only)
Right Brew Valve
Right Bypass
Right Funel Lock (Optional)
Right Server (SH models only)
Refill Valve
Tank Heaters
Heater Contactor
Procedure to test components (outputs):
1.Place brew funnel(s) into rails on the brewer (both sides on DUAL brewers).
2.Place server(s) beneath the brew funnel(s).
3.Press and hold the upper right hidden switch until display reads UNITS. Release the switch. Continue to press and release switch until SERVICE TOOLS appears.
4.Press YES to run tests on various components and outputs within the brewer. Pressing NO will exit this function and advance to next function screen.
5.The display should read TEST OUTPUTS.
6.Press and release YES. The display should read: BREW VALVE on SINGLE brewers
LEFT BREW VALVE on DUAL brewers.
7.To test BREW VALVE, press ON. If the brew valve is functional, water should run from the brewer (left side on DUAL brewers)
8.Press OFF to end flow of water.
9.Press NEXT to advance to the next component to be tested.
NOTE: To bypass testing any component, press NEXT to advance to the next one, without testing the previous component.
10.To test BREW BYPASS on SINGLE brewers or LEFT BREW BYPASS on DUAL brewers, press ON. If the bypass valve is functional, water should run from the brew bypass (left side on DUAL brewers).
11.Press OFF to end flow of water.
12.Press NEXT to advance to the next component to be tested.
13.To test FUNNEL LOCK on SINGLE brewers or LEFT FUNNEL LOCK on DUAL brewers, press ON. If the funnel lock is functional, the lock will come down to hold the funnel in place.
14.Press OFF to retract the funnel lock.
15.Press NEXT to advance to the next component to be tested.
16.(SH models only) To test SERVER on SINGLE brewers or LEFT SERVER on DUAL brewers, press ON. If the server and the sensor are functional, the light on the lower right corner of the server will illuminate.
17.Press OFF to end testing of server.
18.Press NEXT to advance to the next component to be tested.
19.For DUAL brewers, follow steps 7 through 16 to test the right side components.
20.To test REFILL VALVE, press ON. If the refill valve is functional, the sound of the valve operating will be heard.
21.Press OFF to end testing of refill valve.
22.Press NEXT to advance to the next component to be tested.
23.To test TANK HEATERS, connect a voltmeter across each of the tank heaters to check for voltage.
24.Press ON. The correct voltage should be present at the heater terminals.
25.Press OFF to end testing of the tank heaters.
Page 15 |
41746 112008 |
|
Loading...