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INTRODUCTION This equipment will brew one or two half-gallon batches of coffee simultaneously into awaiting dispensers with just the press of a button. One side may include a hot water faucet 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 # 03408.0002 ! WARNING DO NOT OVERLOAD CIRCUIT. ALWAYS ELECTRICALLY GROUND THE CHASSIS OR ADAPTOR PLUG. DO NOT DEFORM PLUG OR CORD. FOLLOW NATIONAL AND LOCAL ELECTRICAL CODES. KEEP COMBUSTIBLES AWAY. # 03409.0002 FAILURE TO COMPLY RISKS EQUIPMENT DAMAGE, FIRE OR SHOCK HAZARD. READ THE ENTIRE
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ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. One circuit models require one 3-wire, grounded service rated 120/208 L2 RED or 120/240 volts ac, 40 amp, single phase, 60 Hz. 120V.A.C. WHITE 208 or 240V.A.C. NEUTRAL 120V.A.C. Two circuit models require two 3-wire, grounded service rated 120/208 L1 BLACK or 120/240 volts ac, 20 amp, single phase, 60 Hz. Proceed as follows: Electrical Hook-Up CAUTION – Improper electrical i
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OPERATING CONTROLS Model CDBC TWIN P1869 ON/OFF SWITCH Pressing the "ON/OFF" switch (indicator glowing) supplies power to the brew station warmer, enables the brew circuit, and energizes the tank refill circuit. Pressing the switch again (indicator not glowing) stops tank refilling, brewing and deenergizes the brew station warmer. Stopping a brew cycle after it has been started will not stop the flow of water into the decanter/server until the funnel is empty. NOTE – Hot water will be available
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INITIAL SET-UP 1. Insert an empty funnel into the funnel rails of one of the brew stations. 2. Place an empty decanter/server under the funnel. 3. Connect the brewer to the power source. 4. Press the "ON/OFF" switch (indicator glowing). 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
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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 decanter/server or graduated vessel beneath the funnel. 2. Press the "ON/OFF" switch (indicator glowing). 3. Press and hold the brew start button until you hear the brew solenoid click on-and-off three times (approximately 10
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PULSE BREW SETUP PROCEDURE The pulse brew parameters (initial fill time, off times, and remaining on times) are entered using the following set- by-example process. 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 "ON/OFF" button. The brew valve will turn on after 10 seco
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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 Press ON/OFF switch on control panel to determine if power is "ON". 2. Water shut off Make sure water is ON. 3. Display flashing Brewer has shut down due to mal- function (See Diagnostic Chart in manual, Page 20, or under top lid of brewer). 4. ON/OFF Switch Make sure ON/OFF Switch is "ON" and indicator is lit. 5. Lime build up on Probe Remove the Probe and check for lime deposit o
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TROUBLESHOOTING (cont.) REFILL CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY 2. Water Level Probe Sensing Sys- Disconnect the brewer from the tem 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 grom- met. Check for continuity from the outside surface of the temperature probe and pin 4 of the plug, conti- nuity shoul
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TROUBLESHOOTING (cont.) HEATING CIRCUIT PROBABLE CAUSE PROBLEM REMEDY Water does not heat to proper 1. Display flashing Brewer has shut down due to temperature malfunction (See Diagnostic Chart in manual, Page 20, or IMPORTANT: Make sure no tem- under top lid). perature tests are taken before the ready light is "ON". Tank tempera- 2. Water not touching tempera- Remove probe and grommet. Look ture must be stabilized before read- ture probe into hole on tank lid. Water must ings are taken. be with
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TROUBLESHOOTING (cont.) HEATING CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Water does not heat to proper 4. Temperature Probe Remove the probe from the grom- temperature (cont.) 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 perature tests are taken before the of 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 before read- OHMS, at 70°F(21°C) th
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TROUBLESHOOTING (cont.) HEATING CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Spitting or excessive steaming 2. Temperature Probe Remove the probe from the grom- (cont.) 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 within these parameters, recon- nect th
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TROUBLESHOOTING (cont.) BREWING CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Brew cycle will not start 1. Display flashing Brewer has shut down due to mal- function (See Diagnostic Chart in manual, Page 20, 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 termi- nal block(s). 4. ON/OFF switch not in the "ON" The indicator lamp must be lit position 5. Lo
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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 switch panel is operating properly, proceed as follows. At- tach a voltmeter to the terminals of the dispense solenoid. Connect the brewer to the power source. Turn on the brewer and press the BREW switch. Voltage should be present at the solenoid terminals. If voltage is not present, refer to the wiring diagrams and check the wiring harness.
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TROUBLESHOOTING (cont.) BREWING CIRCUIT (cont.) PROBABLE CAUSE REMEDY PROBLEM 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 24) Weak beverage 1. Sprayhead A clean stainless steel sprayhead must be used for proper extrac- tion. 2. Water temperature Place an empty brew funnel on an empty decanter/server
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TROUBLESHOOTING (cont.) BREWING CIRCUIT (cont.) PROBABLE CAUSE REMEDY PROBLEM Dry coffee grounds remain in the 1. Sprayhead Make sure sprayhead is present funnel and holes are clear and unob- structed. There should be sepa- rate streams of water coming out of each hole in the sprayhead. ® 2. Funnel loading paper filter must be The BUNN centered in the funnel and the bed of grounds leveled by shaking gen- tly. Low beverage serving tempera- 1. Warmer Disconnect the brewer from the ture power sourc
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DIAGNOSTICS Intermittent flashing of the bank of temperature indicators 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 (is water shut off?) 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 Level Fault - Water pressu
