Bunn CDBCF Airpot User Manual
Thermal Carafe &
Thermal Server Brewers
M PO NY
T FROL OF CO
REM T OF
DISC RE MEN
OPERATING & SERVICE MANUAL
POST OFFICE BOX 3227
29253.0000F 02/04 ©1999
This equipment will automatically brew a
Introduction & Warranty ....................................................................................
User Notices ......................................................................................................
Electrical & Plumbing Requirements .................................................................
Water Sensing Threshold Adjustment Procedure ..............................................
Pulse Brew Setup Procedure .............................................................................
Wiring Diagrams ..............................................................................................
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)
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.
Carefully read and follow all notices in this manual and on the equipment. All labels on the equipment should be kept in good condition. Replace any unreadable or damaged labels.
CAUTION - The brewer must be disconnected from the power source until specified inInitial
Model 15 has an attached cordset and requires
208 or 240V.A.C.
Model 20 requires
Model 35 requires
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 sprayhead.
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
These brewers must be connected to a cold water system with operating pressure between 5 and 90 psi (34.5 and 620 kPa) for CDBC models and 20 and 90 psi (138 and 620 kPa) for CEZ models from a 1⁄2" or larger supply line. A
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).
1.Flush the water line.
2.Securely attach it to the flare fitting at the rear of the brewer.
3.Turn on the water supply.
Placing the "ON/OFF" switch in the "ON" upper position enables the brew circuit, and energizes the tank refill circuit. Placing the switch in the "OFF" lower position stops tank refilling and brewing. Stopping a brew cycle after it has been started will not stop the flow of water into the server until the funnel is empty.
NOTE – Hot water will be available at the faucet in a limited amount when the switch is in the "OFF" position because the tank will not refill.
Momentarily pressing and releasing the switch starts a brew cycle when the "ON/OFF" switch is in the "ON" upper position.
NOTE – The "ON/OFF" switch must be in the "ON" upper position to initiate and complete a brew cycle.
This indicator glows when the preselected brew water temperature has been achieved.
Pressing the "ON/OFF" switch (indicator glowing) enables the brew circuit and energizes the tank refill circuit. Pressing the switch again (indicator not glowing) stops tank refilling and brewing. Stopping a brew cycle after it has been started will not stop the flow of water into the server until the funnel is empty.
NOTE – Hot water will be available at the faucet in a limited amount when the "ON/OFF" indicator is not glowing because the tank will not refill.
Momentarily pressing and releasing the switch starts a brew cycle when the "ON/OFF" indicator is glowing. NOTE – The "ON/OFF" indicator must be glowing to initiate and complete a brew cycle.
This indicator glows when the preset temperature has been achieved. The word "NOT" above "READY" will glow in all other instances.
TEMPERATURE INDICATORS (Feature disabled from the factory – refer to page 8.)
The indicator glows to communicate the brew water temperature. Two indicators will glow when the temperature is between them.
1.Insert an empty funnel into the funnel rails.
2.Place an empty server under the funnel.
3.Connect the brewer to the power source.
5.Water will flow into the tank and stop when the tank is filled to its capacity.
6.Wait approximately twenty minutes for the water in the tank to heat to the proper temperature.
7.Place a small vessel beneath the faucet and open the faucet handle. Release it when you hear the tank refilling.
9.Allow the cycle to finish and measure the amount of water in the server. It should be 64 ounces ± 2. Refer to the adjustments section of this manual should the volume need to be increased or decreased.
The brewer is now ready for use in accordance with the coffee brewing instructions below.
1.Insert a BUNN® filter into the funnel.
2.Pour the fresh coffee into the filter and level the bed of grounds by gently shaking.
3.Slide the funnel into the funnel rails.
4.Place an empty server beneath the funnel.
6.When brewing is completed, simply discard the grounds and filter.
1.The use of a damp cloth rinsed in any mild,
2.Check and clean the sprayhead. The sprayhead holes must always remain open.
Setting Brew Temperature
The brewer is factory set to brew at 200°F(95°C). To change this setting, press and hold the "HIDDEN" switch beneath the "®". The word "TEMP" above the "ON/OFF" switch will glow to correspond with the temporary function change of this switch. Repeatedly press and release the "ON/OFF" switch until one of the bank of temperature indicators shows the approximate desired temperature. When two indicators are glowing, the temperature is approximately the number between them.
Displaying Brew Temperature
The brewer is factory set with the temperature display disabled. To change this setting, press and hold the "ON/ OFF" switch and the "HIDDEN" switch beneath the "®" for five seconds, the entire bank of temperature indicators will glow. Release both switches. Pressing and releasing the "ON/OFF" switch will toggle between turning the entire bank of temperature indicators
Setting Brew Lockout
The brewer is factory set with the brew lockout disabled. Brew lockout prevents starting a brew cycle if the ready indicator is not glowing. When an attempt at brewing cannot be allowed, the word "NOT" and "LOCKOUT" flash for three seconds to indicate the reason the brew can't begin. To change the condition of the brew lockout, press and hold the "HIDDEN" switch beneath the "®" and momentarily press the "BREW" switch.
IMPORTANT: The tank must be full and fill solenoid shut off prior to making these adjustments.
Adjusting Brew Volumes
The brewer is factory set to deliver 64 ounces ± 2 for each brew cycle.
1.Place an empty funnel in the funnel rails and an empty server or graduated vessel beneath the funnel.
2.Place the "ON/OFF" switch in the "ON", upper position.
3.Press and hold the brew start button until you hear the brew solenoid click
4.Allow the cycle to continue until the desired amount of water is dispensed and then turn "OFF" the brewer. The brewer is now set to dispense this amount of water for each subsequent brew cycle.
To increase the amount of water for each brew cycle place an empty funnel in the funnel rails and an empty server or graduated vessel beneath the funnel. Press the "ON/OFF" switch. Press and hold the "BREW" switch until you hear the solenoid click
Momentarily press and release the "BREW" switch once for each ounce (approximate) of water to be added to the prior setting and allow the brew cycle to finish.
To decrease the amount of water for each brew cycle place an empty funnel in the funnel rails and an empty server or graduated vessel beneath the funnel. Press the "ON/OFF" switch. Momentarily press and release the "BREW" switch once for each ounce (approximate) of water to be removed from the existing setting. Press and hold the "BREW" switch until you hear the solenoid click
Water Sensing Threshold Adjustment Procedure
1.Make sure the tank is full of water to be used for calibration. The water must be in contact with the refill probe.
2.Unplug the brewer from the power source, then press and hold the BREW button while power is reapplied.
3.Continue pressing the BREW button until the READY indicator begins to flash. Release the BREW button and then press it again momentarily.
4.The new calibration is automatically completed within a few seconds. If the water is too pure for use with the brewer, the READY indicator will flash very rapidly and the old calibration will be retained.
Pulse Brew Setup Procedure
The pulse brew parameters (initial fill time, off times, and remaining on times) are entered using the following
1.First set the brew volume using the standard procedure in Brew Volume Setup.
2.Position an empty container under the sprayhead. Allow the tank to finish refilling. Make sure that the READY lamp is on, or that the BREW LOCKOUT function is turned off.
3.Press and hold the OFF/ON button. The brew valve will turn on after 10 seconds. Release the button. This begins the initial
4.The spray is now stopped and the off time setting has begun. Press the OFF/ON button momentarily to end theoff time.
5.The spray is now on again and the remaining on time setting has begun. Press the OFF/ON button momentarily at the end of the desiredremaining on time.
6.The setup is now complete and the parameters are stored in memory. The spray will continue the off and on cycles until the brew volume of step 1 is complete. Pressing the OFF/ON button again will terminate the brewing cycle, with the parameters stored in memory.
7.If only a preinfusion is desired, i.e. an initial on time followed by one off period, use the same procedure, but stop after step 4 and allow the brew to finish the volume set in step 1. This will store the initial on time and off time in memory.
Procedure for Disabling Pulse Brew or Preinfusion:
1.Position an empty container under the sprayhead. Allow the tank to finish refilling. Make sure that the READY lamp is on, or that the BREW LOCKOUT function is turned off.
2.Press and hold the OFF/ON button. The brew valve will turn on after 10 seconds. Release the button.
3.Allow the spray to continue and press no buttons until spray stops. The pulse and preinfusion functions are now disabled.
NOTE: When the brewer has been set up for pulse or preinfusion, the adjustment of brew volume is done the same as always and has no effect on the pulse brew parameters. The pulsing is temporarily disabled while adjusting the brew volume and automatically returns during normal brewing.
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
•Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.
•All electronic components have 120 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 to 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.
•Unplug the brewer when servicing, except when electrical tests are specified.
•Follow recommended service procedures.
•Replace all protective shields or safety notices.
Before troubleshooting this brewer, check for the following:
1.Make sure ribbon cable is properly attached to the control board (ALL PINS INSERTED INTO PLUG).
2.Make sure there is a nylon insulating washer under each screw head that holds the control board to the plastic front end cap. This is important for proper operation.
Locate J6 connector on control board. If jumper is across pins 1 & 2, board is set up to operate tea brewer or a brewer that DOES NOT use a water level probe. If jumper is across pins 2 & 3, board is set up to operate a coffee brewer or a brewer that uses a water level probe. Look at the bottom side of the control board. Pin 1 of connector J6 is marked by a square solder pad on the foil side of the board and pins 2,3 & 4 are marked by a round solder pad.
Make sure before servicing brewer that voltage is present at control board.