Operating & service manual bunn-o-matic corporation post office box 3227 springfield, illinois 62708-3227 phone: (217) 529-6601 fax: (217) 529-6644 27479.0000d 12/00 ©1996 bunn-o-matic corporation gmb-ps ca ut io n di sc ar d de ca nt er if: . Cracked . Scratched . Boiled dry . Heated when empty . U...
Page 2 introduction this equipment will brew a half-gallon batch of coffee into an awaiting dispenser at the push of a button and includes a hot water faucet for allied beverage use. It is only for indoor use on a sturdy counter or shelf. Warranty bunn-o-matic corp. (“bunn”) warrants the equipment m...
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. #00831.0000 this equipment is to be installed to comply with the basic plumbing code of the building ...
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 1. Attach the flare fitting from the short piece of tubing on the strainer (supplied) to the water inlet fitting at the left rear of the brewer. 2. Flush the water line and securely attach it to the flare fitting on the strainer. 3. Turn on the water supply. 4. Place an empty vessel beneath t...
Page 6 27479 121500 to decrease a batch size. Press and release the start or brew switch once for every two-second interval to be removed from the total brew time period; then immediately press and hold down the start or brew switch until three clicks are heard. Release the switch. (failure to relea...
Page 7 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 8 troubleshooting (cont.) brew cycle will not start (cont.) water is not hot probable cause remedy refer to service - on/off switch for testing. See page 16 refer to service - start switch for testing procedures. See page 18 refer to service - timer for testing procedures. See page 20 or 21 ref...
Page 9 troubleshooting (cont.) problem inconsistent beverage level in dis- penser consistently low beverage level in the dispenser probable cause 1. Flow control (.175 gpm) 2. Strainer 3. Syphon system 4. Lime build-up caution - tank and tank compo- nents should be delimed regularly depending on loc...
Page 10 troubleshooting (cont.) problem consistently low beverage level in the dispenser (cont.) spitting or excessive steaming dripping from sprayhead water flows into tank continuously (on/off switch "on") probable cause 3. Strainer 1. Lime build-up caution - tank and tank compo- nents should be d...
Page 11 troubleshooting (cont.) problem water flows into tank continuously (on/off switch "off") beverage overflows dispenser weak beverage probable cause 1. Solenoid valve 1. Dispenser 2. Timer 3. Solenoid valve 1. Filter type 2. Coffee grind 3. Sprayhead 4. Funnel loading 5. Water temperature reme...
Page 12 troubleshooting (cont.) problem dry coffee grounds remain in the funnel brewer is making unusal noises probable cause 1. Funnel loading 1. Solenoid valve 2. Plumbing lines 3. Water supply 4. Tank heater remedy the bunn ® paper filter must be centered in the funnel and the bed of grounds leve...
Page 13 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 o n h ig h fl am e . O r e xp os ed e le ct ric e le me nt s failure to comply risks injury pn : 6 58 198 5 b un n-o -m at ic c or po ra tio n funnel contents are hot ! Dis connect...
Page 14 on of f st ar t service (cont.) control thermostat location: the control thermostat is located inside the hood on the right side. Test procedures: 1. Disconnect the brewer from the power source. 2. With a voltmeter, check the voltage across the blue/black wire on the control thermostat and t...
Page 15 on of f st ar t service (cont.) limit thermostat location: the limit thermostat is located inside the hood on the tank lid. Test procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the blue/black and black wires from the limit thermostat. 3. With an ohmmeter, check for ...
Page 16 on off st ar t b u n n 90 psig max operating pressure s trainer/flow control # 24222.0222 r epl. Flow w asher #20526.0222 ) (repl. Screen #23721.0000) .222 gpm flow service (cont.) on/off switch location: the on/off switch is located on the left front of the hood. Test procedure: 1. Disconne...
Page 17 service (cont.) solenoid valve location: the solenoid valve is located inside the bottom right side of the trunk mounted on the base. Test procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the white/red and white/green wires from the solenoid valve. With the "on/off" ...
Page 18 service (cont.) start switch location: the start switch is located in the right front of the hood just to the left of faucet. Test procedure: 1. Disconnect the brewer from the power supply. 2. Disconnect the white/orange wire from the top switch terminal and the white/yellow from the bottom ...
Page 19 on of f st ar t 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. With a voltmeter, check the voltage across the black and white wires on 120 volt models or the black and red wires...
Page 20 service (cont.) timer (early models) location: the timer is located inside the right front of the hood. Test procedure. 1. Disconnect the brewer from the power source. 2. Rotate the brew timer dial fully counterclockwise. 3. With a voltmeter, check the voltage across termi- nals tl1 & tl2 (w...
Page 21 service (cont.) 27479 091596 digital timer (late models) on of f st ar t p2267 late models fig. 16 digital timers location: the timer is located inside the hood, attached to the left side. Test procedure. Note: do not remove or install wires while timer board is installed. Pressure applied t...
Page 22 27479 121500 to increase a brew volume, place the on/off switch in the "on" position, press and hold the start switch until three clicks are heard. Release the switch and press it again one or more times. (failure to re- lease the switch within two seconds after the third click causes the vo...
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