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CEZ, CEZF,
CDBC, CDBCF
Airpot,
Thermal Carafe &
Thermal Server Brewers
DISCONTINUED VERSION
The information in this manual
is no longer current.
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
29253.0000F 02/04 ©1999 Bunn-O-Matic Corporation www.bunnomatic.com
BUNN
CAUTION : WARMERS AND SURFACES ARE HOT
! WARNING
DISCONNECT FROM POWER SOURCE
BEFORE REMOVAL OF ANY PANEL OR
REPLACEMENT OF ANY
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INTRODUCTION This equipment will automatically brew a half-gallon batch of coffee into an awaiting server at the press of a button. A hot water faucet may be included for allied beverage use. Most functions of the brewer are digitally controlled. It is only for indoor use on a sturdy counter or shelf. CONTENTS Introduction & Warranty .................................................................................... 2 User Notices ..............................................................
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USER NOTICES 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. # 00986.0000 # 00656.0000 # 00658.0000 # 10044.0000 29253 011900 Page 3
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ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. Model 15 has an attached cordset and requires 2-wire grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz. L2 RED WHITE 120V.A.C. NEUTRAL WHITE 120V.A.C. 208 or 240V.A.C. L1 BLACK NEUTRAL 120V.A.C. L1 BLACK Model 20 requires 2-wire, grounded service rated Model 35 requires 3-wire, grounded service rated 120 volts ac, 20 amp, single phase, 60 Hz. Proceed as 120/2
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OPERATING CONTROLS Model CEZ-APS/TS/TSR ON/OFF SWITCH 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. Stop- ping 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 th
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INITIAL SET-UP 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. 4. Model CDBC-APS/TC/TS/TSR – Press the "ON/OFF" switch (indicator glowing). Model CEZ-APS/TS/TSR – Place the "ON/OFF" switch in the "ON" upper position. 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 smal
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CEZ-APS/TS/TSR ADJUSTMENTS & OPTIONAL SETTINGS IMPORTANT: The tank must be full and fill so- lenoid shut off prior to making these adjust- ments. Adjusting Brew Volumes The brewer is factory set to deliver 64 ounces ± 2 for each brew cycle. BREW VOLUME SET-UP: Use the following steps when the setting is unknown or a different circuit board is being installed. 1. Place an empty funnel in the funnel rails and an empty server or graduated vessel be- neath the funnel. 2. Place the "ON/OFF" switch in
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CDBC-APS/TC/TS/TSR ADJUSTMENTS & OPTIONAL SETTINGS P1912 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, th
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CDBC-APS/TC/TS/TSR ADJUSTMENTS & OPTIONAL SETTINGS (cont) 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 autom
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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 volt ac and low voltage dc potential on their terminals. Shorting of terminals or the appl
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TROUBLESHOOTING (cont.) REFILL CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Will not fill or refill 1. Power off to brewer (CDBC-APS/ Press ON/OFF switch on control TC/TS/TSR & CEZ-APS/TS/TSR) panel to determine if power is ON. 2. Water shut off (CDBC-APS/TC/ Make sure water is ON. TS/TSR & CEZ-APS/TS/TSR) 3. Display flashing (CDBC-APS/TC/ Brewer has shut down due to TS/TSR) or ready light flashing malfunction (See Diagnostic Chart (CEZ-APS/TS/TSR) in manual, Page 19, or under top lid of brewer). 4. ON
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TROUBLESHOOTING (cont.) REFILL CIRCUIT (cont.) PROBABLE CAUSE PROBLEM REMEDY Fill or refill does not shut "OFF" (ON/ 2a. Water Level Probe Sensing A) Disconnect the brewer from the OFF Switch "ON") (cont) System (CDBC-APS/TS/TSR) power source. Disconnect the J3 connector from the control board. Check for continuity from the nut on top of the level probe to pin 1 of the plug, continuity should be present. Pull the temperature probe up about an inch from the grommet. Check for continuity from the
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TROUBLESHOOTING (cont.) HEATING CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Water does not heat to proper Brewer has shut down due to 1. Display flashing (CDBC-APS/TC/ temperature malfunction (See Diagnostic Chart TS/TSR) or ready light flashing (CEZ-APS/TS/TSR) in manual, Page 19, or under top IMPORTANT: Make sure no tem- lid). perature tests are taken before the ready light is "ON". Tank tempera- Remove probe and grommet. Look 2. Water not touching temperature ture must be stabilized before read- in
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TROUBLESHOOTING (cont.) HEATING CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY Water does not heat to proper 4a. Temperature Probe (CDBC-APS/ A) Remove the probe from the grom- temperature (cont.) TC/TS/TSR) met and submerge in a water bath of approximately 70°F(21°C). Con- IMPORTANT: Make sure no tem- nect an ohmmeter to pins 3 and 4 of perature tests are taken before the the J3 connector. At 60°F(16°C) ready light is "ON". Tank tempera- the reading should be 15.3k ± 2k ture must be stabilized b
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TROUBLESHOOTING (cont.) HEATING CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY Spitting or excessive steaming 2a. Temperature Probe (CDBC-APS/ A) Remove the probe from the grom- (cont.) TC/TS/TSR) met and submerge in a water bath of approximately 70°F(21°C). Con- nect an ohmmeter to pins 3 and 4 of the J3 connector. At 60°F(16°C) the reading should be 15.3k ± 2k OHMS, at 70°F(21°C) the reading should be 11.8k ± 2k OHMS, and at 80°F(27°C) the reading should be 9.3k ± 2k OHMS. If the probe is withi
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TROUBLESHOOTING (cont.) BREWING CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Brew cycle will not start 1. Display flashing (CDBC-APS/TC/ Brewer has shut down due to TS/TSR) or ready light flashing malfunction (See Diagnostic Chart (CEZ-APS/TS/TSR) in manual, Page 19, or under top lid of brewer). 2. No water Water lines and valves to the brewer must be open. 3. No power or incorrect voltage to Check for voltage across the black the brewer and white terminals at the terminal block. 4. ON/OFF switch not i
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TROUBLESHOOTING (cont.) BREWING CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY Brew cycle will not start (cont.) 8. Control board or dispense valve If the start switch (CEZ-APS/TS/ (CDBC-APS/TC/TS/TSR & CEZ- TSR) or switch panel (CDBC-APS/ APS/TS/TSR) TC/TS/TSR) is operating properly, proceed as follows. Attach a volt- meter to the terminals of the dis- pense valve solenoid. Connect the brewer to the power source. Turn on the brewer and press the BREW switch. Voltage should be present at the sole
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TROUBLESHOOTING (cont.) BREWING CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY Dripping from sprayhead 1. Lime build up Inspect the tank assembly for ex- cessive lime deposits. Delime as required. 2. Dispense valve Remove the dispense valve and clear any obstructions. Rebuild or replace the valve if necessary.(See page 26) Weak beverage 1. Sprayhead A clean stainless steel spray-head must be used for proper extraction. 2. Water temperature Place an empty brew funnel on an empty server beneath the
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TROUBLESHOOTING (cont.) BREWING CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY Dry coffee grounds remain in the 1. Sprayhead Make sure sprayhead is present and funnel holes are clear and unobstructed. There should be separate streams of water coming out of each hole in the sprayhead. ® 2. Funnel loading The BUNN paper filter must be centered in the funnel and the bed of grounds leveled by shaking gen- tly. 29253 111103 Page 19
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DIAGNOSTICS Intermittent flashing of the READY indicator (Model CEZ) or the bank of temperature indicators (Model CDBC) indicates that a fault exists. Count the number of flashes between pauses and use this chart as a guide to investigating the fault. FLASHES CAUSE THINGS TO CHECK 1 Dry Plug - In Fault - Water Pressure Sheath of temperature probe dry for 10 minutes after power-up Temperature probe wiring Fill valve wiring, function, & strainer Green wire between tank and circuit board 2 Low Tank
