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Bunn CDBC Operating & Service Manual

Manual is about: Bunn CDBC: Service Manual

Summary of CDBC

  • Page 1

    Bunn-o-matic corporation post office box 3227 springfield, illinois 62708-3227 phone: (217) 529-6601 fax: (217) 529-6644 www.Bunnomatic.Com operating & service manual cez cdbc twin caution : caution : caution : caution discard decanter if: . C racked . Scratched . Boiled dry . H eated when empty . U...

  • Page 2

    Page 2 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...

  • Page 3

    Page 3 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 # 12364.0000 # 10044.0000 ! Warning do not overload circuit. A...

  • Page 4

    Page 4 electrical requirements caution - the brewer must be disconnected from the power source until specified in initial set-up. Electrical hook-up caution – improper electrical installation will damage electronic components. 1. An electrician must provide electrical service as specified. 2. Using ...

  • Page 5

    Page 5 on/off switch placing the "on/off" switch in the "on" upper position supplies power to the brew station warmer, enables the brew circuit, and energizes the tank refill circuit. Placing the switch in the "off" lower position stops tank refilling, brewing and deenergizes the brew station warmer...

  • Page 6

    Page 6 brew switch 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. Additional warmer switches pressing any additional warmer switch so the indicator is glowi...

  • Page 7

    Page 7 cez adjustments & optional settings + + + + + lock unlock temperature 205 cal j2 j5 j1 j6 j3 j7 counter trm2 trm1 ready led bom p a r t no. 28742- lock unlock (brew lockout enabled) lock unlock (brew lockout disabled) + + + + + lock unlock temperature 205 cal j2 j5 j1 j6 j3 j7 counter trm2 tr...

  • Page 8

    Page 8 cdbc adjustments & optional settings hidden switch hidden switch note: the following adjustments must be performed for each brew station. 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 ...

  • Page 9

    Page 9 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 or graduat...

  • Page 10

    Page 10 pulse brew setup procedure (cdbc twin & cdbcf twin) 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 c...

  • Page 11

    Page 11 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...

  • Page 12

    Page 12 will not fill or refill fill or refill does not shut "off" (on/off switch "on") probable cause remedy problem 1. Power off to brewer (cdbc & cez) 2. Water shut off (cdbc & cez) 3. Display flashing (cdbc) or ready light flashing (cez) 4. On/off switch (cdbc & cez) 5. Lime build up on probe (c...

  • Page 13

    Page 13 fill or refill does not shut "off" (on/off switch "off") 2a. Water level probe sensing sys- tem (cdbc) 2b. Water level probe sensing sys- tem (cez) 3. Refill valve or control board (cdbc & cez) 4. Water is too conductive for proper operation when using the factory setting of sensing threshol...

  • Page 14

    Page 14 troubleshooting (cont.) probable cause remedy heating circuit problem 1. Display flashing (cdbc) or ready light flashing (cez) 2. Water not touching tempera- ture probe 3a. Dry plug in probe sensing system (cdbc) 3b. Dry plug in probe sensing system (cez) brewer has shut down due to malfunct...

  • Page 15

    Page 15 troubleshooting (cont.) water does not heat to proper temperature (cont.) important: make sure no tem- perature tests are taken before the ready light is "on". Tank tempera- ture must be stabilized before read- ings are taken. Spitting or excessive steaming 4a. Temperature probe (cdbc) 4b. T...

  • Page 16

    Page 16 troubleshooting (cont.) spitting or excessive steaming (cont.) brewer is making unusual noises 2a. Temperature probe (cdbc) 2b. Temperature probe (cez) 3. Control board (cdbc & cez) 1. Plumbing lines 2. Water supply 3. Lime build up a) remove the probe from the grommet and submerge in a wate...

  • Page 17

    Page 17 troubleshooting (cont.) probable cause remedy brewing circuit problem brew cycle will not start 1. Display flashing (cdbc) or ready light flashing (cez) 2. No water 3. No power or incorrect voltage to the brewer 4. On/off switch not in the "on" position 5. Low water temperature (brew lockout...

  • Page 18

    Page 18 brew cycle will not start (cont.) consistently low beverage level in the dispenser or beverage over- flows dispenser troubleshooting (cont.) probable cause remedy if the start switch (cez) or switch panel (cdbc) is operating prop- erly, proceed as follows. Attach a voltmeter to the terminals...

  • Page 19

    Page 19 troubleshooting (cont.) dripping from sprayhead weak beverage 1. Lime build up 2. Dispense valve 1. Sprayhead 2. Water temperature 3. Filter type 4. Coffee grind 5. Funnel loading inspect the tank assembly for ex- cessive lime deposits. Delime as required. Remove the dispense valve and clear...

  • Page 20

    Page 20 troubleshooting (cont.) dry coffee grounds remain in the funnel low beverage serving tempera- ture 1. Sprayhead 2. Funnel loading 1. Warmer make sure sprayhead is present and holes are clear and unob- structed. There should be six sepa- rate streams of water coming out of the sprayhead. The ...

  • Page 21

    Page 21 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...

  • Page 22

    Page 22 caution : caution : caution : caution : ca ut io n di sc ar d de ca nt er if: . Cr acked . S cratc hed . Boiled dry . Heated w hen e mpty . Use d o n high flam e . O r e xpo sed e lec tr ic e le ments fa ilu re to c om pl y ri sk s in ju ry pn: 6 58 1985 b unn-o-matic corp ora tio n fu nn el...

  • Page 23

    Page 23 caution : caut ion dis ca rd d ec an ter if: . C ra ck ed . S cr at ch ed . B oi le d dr y . H ea te d w he n em pt y . U se d on h ig h fl am e . O r ex po se d el ec tr ic e le me nt s fa ilu re to c om ply r is ks in ju ry pn : 6 58 19 85 b un n-o -m at ic c or po ra tio n fu nn el co nte...

  • Page 24

    Page 24 ca ut io n : ca ut io n : ca ut io n : tr m2 j1 j2 j3 j4 j5 j6 j7 tr m1 tr m2 j1 j2 j3 j4 j5 j6 j7 tr m1 caution : warmers and surfaces are hot on /lo w er sta rt fr on t-sid e-r ea r caution : warmers and surfaces are hot on/l ow er star t fr on t-s id e-r ea r service (cont.) pc control bo...

  • Page 25

    Page 25 caution : caution : caution : ca utio n discard decanter if: . C ra ck ed . S cr at ch ed . B oil ed d ry . H ea te d w he n em pt y . U se d on h ig h fl am e . O r ex po se d e le ct ric e le me nt s failure to comply risks injury pn : 6 58 19 85 b un n-o- mat ic c or po ra tio n funnel co...

  • Page 26

    Page 26 ca ut io n : tr m2 j1 j2 j3 j4 j5 j6 j7 tr m1 tr m2 j1 j2 j3 j4 j5 j6 j7 tr m1 ca utio n dis ca rd d ec an te r if: . C rac ke d . S cr at ch ed . B oiled d ry . He at ed w hen e mp ty . U se d on h ig h f la me . O r ex po sed e le ct ric e lem ents fa ilu re to c om pl y r is ks in ju ry p...

  • Page 27

    Page 27 ca utio n : j1 j2 j4 j5 j6 tr m2 j1 j2 j3 j4 j5 j6 j7 tr m1 caution discard decanter if: . C ra ck ed . S cr at ch ed . B oi le d d ry . H ea te d w he n e mp ty . U se d o n h ig h f la me . O r e xp os ed e le ct ric e le me nt s failu re to comply risks inju ry pn : 6 58 19 85 b un n- o- ...

  • Page 28

    Page 28 ca ut io n : ca ut io n di sc ar d de ca nt er if: . Cr acked . Scratched . B oiled dry . Heated when e mpty . Used on high flame . O r exposed electric elements fa ilu re to c om pl y ri sk s in ju ry pn : 6 58 19 85 b un n- o- ma tic c or po ra tio n fu nn el c on te nt s ar e ho t ! Servi...

  • Page 29

    Page 29 tr m2 j1 j2 j3 j4 j5 j6 j7 tr m1 tr m2 j1 j2 j3 j4 j5 j6 j7 tr m1 caution disc ar d d ec an ter if: . C ra ck ed . S cr at ch ed . B oi le d d ry . H ea te d w he n e mp ty . U se d o n h ig h fl am e . O r ex po se d ele ctr ic e le me nt s fa ilur e to c om ply r isk s in jur y pn : 65 8 1...

  • Page 30

    Page 30 location: the tank heaters are located inside the tanks and secured to the tank bottoms. Test procedures: 1. Disconnect the brewer from the power supply. 2. With a voltmeter, check the voltage across the red wire from the terminal block and the black wire from the control board. Connect the ...

  • Page 31

    Page 31 p1856 service (cont.) tank heaters (cont.) 17. Install tank assembly onto mounting brackets and secure in place with four #8-32 nuts. 18. Install tank lid and secure in place with eight #8-32 nuts. 19. Connect the two white wires of the tank warmer blanket. 20. Connect the limit thermostat t...

  • Page 32

    Page 32 ut ion : ut ion : ca u trm 2 j1 j2 j3 j4 j5 j6 j7 tr m1 tr m2 j1 j2 j3 j4 j5 j6 j7 tr m1 ca ut io n : warmers and surface s a on/lo w er sta rt f ca ut io n : warmers and surfaces are hot on /low er sta rt fron t-sid e-re ar service (cont.) refill valve location: the refill valves are locate...

  • Page 33

    Page 33 caution : caution : caution : ca ut io n di sc ar d de ca nt er if: . Cra cke d . Scratc he d . Boile d dry . Heate d whe n e mp ty . Use d on h ig h fl ame . Or exp os ed electric ele me nts fa ilu re to c om pl y ri sk s in ju ry pn : 6 58 19 85 bu nn-o -m atic co rpo rat io n fu nn el c o...

  • Page 34

    Page 34 29323.0001d 6/99 ©1999 bunn-o-matic corporation grn grn blk blk-14 whi whi-14 whi-14 blk-14 blk-14 red-14 (model 35) red-14 (model 35) brewers with 1 power cord only l1 n l 2 l1 n l 2 l1 n l 2 120/208v ac 3 wire 120/240v ac 3 wire single phase schematic wiring diagram cez twin 0/6 (left) sch...

  • Page 35

    Page 35 schematic wiring diagram cdbc twin 0/6 (left) 29323.0000b 1/99 ©1999 bunn-o-matic corporation tank heater grn grn red-14 (model 35) blk blk-14 schematic wiring diagram cdbc twin 0/6 (right) whi whi-14 whi-14 blk-14 blk-14 red-14 (model 35) brewers with 1 power cord only l1 n l 2 l1 n l 2 l1 ...

  • Page 36

    Page 36 schematic wiring diagram cdbc twin 2/2 (left) 29323.0002a 8/00 ©2000 bunn-o-matic corporation tank heater grn grn red-14 (model 35) blk blk-14 schematic wiring diagram cdbc twin 2/2 (right) whi whi-14 whi-14 blk-14 blk-14 red-14 (model 35) brewers with 1 power cord only l1 n l 2 l1 n l 2 l1 ...