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Bunn C Operating & Service Manual

Manual is about: Bunn C: Reference Guide

Summary of C

  • Page 1

    Operating & service manual bunn-o-matic corporation post office box 3227 springfield, illinois 62708-3227 phone: (217) 529-6601 fax: (217) 529-6644 www.Bunnomatic.Com c, ct, ctf, cwt, cwtf, single cw, single cwf bunn ® 10841.0000f 02/03 ©1996 bunn-o-matic corporation ca ut io n : w ar m er s an d su...

  • Page 2

    Page 2 10841 020503 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) comp...

  • Page 3: Caution

    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. 10841 020503 #00656.0000 #00658.0000 #02763.0000 #12364.0000 caution pour in water only warmers and s...

  • Page 4

    Page 4 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. Model 35 requires 3-wire, grounded service rated 12...

  • Page 5

    Page 5 models w/out faucet models ct, cwt, ctf, cwtf, single cw & single cwf 1. Flush the water line and securely attach it to the flare fitting on the strainer or tee. 2. Turn on the water supply. 3. On ctf, cwtf and single cwf models, place an empty vessel beneath the faucet and lift the handle un...

  • Page 6

    Page 6 initial set-up caution - the brewer must be disconnected from the power source throughout the initial set-up, except when specified in the instructions. 1. Insert an empty funnel into the funnel rails. 2. Place an empty dispenser under the funnel. 3. Place the heater switch at the rear of the...

  • Page 7

    Page 7 to increase a batch size. Press and hold the start or brew switch until three clicks are heard. Release the switch (failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory) and press it ag...

  • Page 8

    Page 8 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 9

    Page 9 troubleshooting (cont.) problem brew cycle will not start (cont.) (ct, ctf, cwt, cwta, cwtb, cwtf, cwtfa, cwtfb, single cw & single cwf) water is not hot probable cause remedy 3. On/off switch 4. Start switch 5. Timer 6. Solenoid valve 7. Water strainer/flow control (.222 gpm) 1. Tank heater ...

  • Page 10

    Page 10 troubleshooting (cont.) problem inconsistent beverage level in dispenser consistently low beverage level in the dispenser (ct, ctf, cwt, cwta, cwtb, cwtf, cwtfa, cwtfb, single cw & single cwf) spitting or excessive steaming probable cause 1. Strainer/flow control (.222 gpm) (ct,ctf, cwt, cwt...

  • Page 11

    Page 11 troubleshooting (cont.) problem spitting or excessive steaming (cont.) dripping from sprayhead water flows into tank continu- ously (on/off switch "on") water flows into tank continu- ously (on/off switch "off") beverage overflows dispenser probable cause 2. Control thermostat 1. Syphon syst...

  • Page 12

    Page 12 troubleshooting (cont.) problem weak beverage dry coffee grounds remain in the funnel brewer is making unusal noises (ct, ctf, cwt, cwta, cwtb, cwtf, cwtfa, cwtfb, single cw & single cwf) probable cause 1. Filter type 2. Coffee grind 3. Sprayhead 4. Funnel loading 5. Water temperature 1. Fun...

  • Page 13

    Page 13 troubleshooting (cont.) problem brewer is making unusal noises (cont.)(ct, ctf, cwt, cwta, cwtb, cwtf, cwtfa, cwtfb, single cw & single cwf) brewer is making unusal noises (c) low beverage serving tempera- ture brewer does not change volume when half/full switch is changed. Probable cause 4....

  • Page 14

    Page 14 ca ut io n : w ar m er s an d su rf ac es a r e h ot ca ut io n ca ut io n dis ca rd d ec an te r di sc ar d de ca nt er if: if: . C ra ck ed . C ra ck ed . S cr at ch ed . S cr at ch ed . B oi le d dr y . B oi le d dr y . H ea te d w he n em pt y . H ea te d w he n em pt y . U se d on h ig ...

  • Page 15

    Page 15 service (cont.) control thermostat model cwt model single cw location: the control thermostat is located inside the trunk on the left side of the component bracket. Test procedures: 1. Disconnect the brewer from the power source. 2. Locate the blue wire on the control thermostat. 3. Check th...

  • Page 16

    Page 16 blu to blu wire from limit thermostat blk to blk wire fromtank heater (brewers w/out faucet) blk tothermal cut-off from tank heater (brewers with faucet) service (cont.) control thermostat (cont.) 4. Slide the grommet to the line 4.5" above the bulb on the new capillary tube. 5. Insert the c...

  • Page 17

    Page 17 ca ut io n caution dis ca rd d ec an te r discard decanter if: if: ! B u n n ® c series r e a d y lower pour in water only ca ut io n caution dis ca rd d ec an te r discard decanter if: if: ! B u n n ® c series r e a d y lower pour in water only ca ut io n caution dis ca rd d ec an te r disc...

  • Page 18

    Page 18 connect wire to terminal #1 as follows: lower warmer ........................................................ Whi/red one top warmer ............................................................. Vio two top warmers (front) .................................................................... ...

  • Page 19

    Page 19 service (cont.) solenoid valve - ct, cwt & single cw location: the solenoid valve is located inside the trunk on the lower center part of the component bracket. Test procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the white/blue and white/green wires from the soleno...

  • Page 20

    Page 20 service (cont.) start switch - ct, cwt & single cw location: the start switch is located in the center front of the hood. Test procedure: 1. Disconnect the brewer from the power supply. 2. Disconnect the blue wire from the top switch terminal and the white/red from the bottom switch terminal...

  • Page 21

    Page 21 service (cont.) tank heater location: the tank heater is located inside the tank and secured to the tank lid. Test procedures: 1. Disconnect the brewer from the power supply. 2. Check the voltage across the black and white wires on 120 volt models or the black and red wires for 120/240 volt ...

  • Page 22

    Page 22 service (cont.) tank heater (cont.) tank heater switch location: the tank heater switch is located on the rear of the brewer on the upper left side of the trunk. Test procedure: 1. Disconnect the brewer from the power source. 2. Disconnect the black wire from the limit thermo- stat. 3. With ...

  • Page 23

    Page 23 service (cont.) tank heater switch (cont.) 14. Insert new tank heater switch through the hole in the upper left rear of the trunk and secure with switch indicator/guard bracket, hex facenut and plastic facenut. 15. Reconnect the two black wires to the tank heater switch terminals. 16. Set ta...

  • Page 24

    Page 24 service (cont.) with a voltmeter when the "on/off" switch is in the "on" position (upper) and start switch pressed. Connect the brewer to the power source. The indication must be: a) 120 volts ac for two wire 120 volt models and three wire 120/240 volt models. B) 200 to 230 volts ac for two ...

  • Page 25

    Page 25 1 2 3 4 5 .5 minutes bunn-o-matic p/n 2235-120 vac to main wiring harness whi to solenoid valve blk to solenoid valve p1136 10841 020503 dial timer digital brew timer (late models) digital brew timer service (cont.) dial timer (early models) (cont.) location: the timer is located inside the ...

  • Page 26

    Page 26 4. Attach all wires to the replacement timer board prior to installation to the component mounting bracket. Refer to fig. 21 when reconnecting the wires. 5. Install new circuit board with spacers (as re- quired) to the component mounting bracket. 6. Adjust the timer as described below. Timer...

  • Page 27

    Page 27 service (cont.) warmer element(s) location: the warmer element(s) is located under the warmer plate. Test procedures: 1. Disconnect the brewer from the power source. 2. Use the white or red wire to the terminal block and the white/red, brown/black or violet wire to the "on/off" switch. 3. Ch...

  • Page 28

    Page 28 p3 blk p1, p2, & p3 are pins of a polarized three-pin connector. Blu blu/blk whi brew timer p1 p2 whi optional automatic brew circuit schematic wiring diagram c, ct & cwt 10836.0000e 07/00 ©1995 bunn-o-matic corporation p2 p1 front whi whi p3 whi brn/blk vio whi rear whi whi blk whi/red lowe...

  • Page 29

    Page 29 p3 p1, p2, & p3 are pins of a polarized three-pin connector. Blu p1 red optional automatic brew circuit schematic wiring diagram cwtb 10836.0002e 07/00 ©1995 bunn-o-matic corporation p2 p1 front red red p3 red brn/blk vio red rear red red red blk whi/red lower warmer start switch whi/red whi...

  • Page 30

    Page 30 p3 p1, p2, & p3 are pins of a polarized three-pin connector. Blu p1 red optional automatic brew circuit schematic wiring diagram cwta 10836.0003e 07/00 ©1995 bunn-o-matic corporation p2 p1 front red red p3 red brn/blk vio red rear red whi red red blk whi/red lower warmer start switch whi/red...

  • Page 31: Schematic Wiring Diagram

    Page 31 p3 blk p1, p2, & p3 are pins of a polarized three-pin connector. Whi blk sol blu blu whi brew timer p1 p2 whi optional automatic brew circuit schematic wiring diagram cwtf, cwtfb no warmer whi blk start switch whi/red whi/red tank heater l1 grn blk red (model 35) whi (models 15 & 20) n l2 he...

  • Page 32: Schematic Wiring Diagram

    Page 32 ready indicator blk blu sw. & thermostat p3 blk p1, p2, & p3 are pins of a polarized three-pin connector. Whi blk sol blu blu whi brew timer p1 p2 whi optional automatic brew circuit schematic wiring diagram cwtfa no warmer red blk whi/red whi/red tank heater l1 grn blk red l2 heater switch ...