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CONTENTS Introduction ............................................................... 2 User Notices .............................................................. 3 Electrical Requirements ............................................. 4 Plumbing Requirements ............................................ 4 Initial Set-Up.............................................................. 5 Adjusting Brew Volumes............................................ 6 Operating Controls...........................
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HI ELECTRICAL REQUIREMENTS CAUTION - Do not connect the brewer to the power source until specified in Initial Set-Up. L2 RED WHITE L2 RED RED 120V.A.C. NEUTRAL WHITE 120V.A.C. NEUTRAL 200 OR 240V.A.C. 100V.A.C. L1 BLACK 208 or 240V.A.C. L1 BLACK L1 BLACK NEUTRAL 120V.A.C. L1 BLACK MODELS OT15 & 20 require 2- MODELS OTA, RTA & RT35B MODELS OT35 & RT35 require MODEL RT25B requires 2- wire, grounded service rated require 2-wire, grounded ser- 3-wire, grounded service rated wire, grounded service 12
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SET LOCK J1 J2 PLUMBING REQUIREMENTS (Cont.) Plumbing Hook-Up Model OT15 has an attached water strainer, proceed to step 2. Models OT20, OT35, & RT35, proceed as follows: 1. Remove the rear panel and bottom pan. Run the long piece of tubing from the strainer (supplied) under the brewer and attach it to the water inlet fitting on the solenoid. Reinstall the bottom pan and rear panel. 2. Flush the water line and securely attach it to the 1/4" flare fitting on the strainer. 3. Turn on the wat
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ADJUSTING BREW VOLUMES CAUTION - Disconnect the power source from the brewer prior to the removal of any panel for the replacement or adjustment of any component. NOTE: Prior to setting or modifying batch sizes, check that the brewer is connected to water supply, the tank is properly filled, and a funnel and server are in place. 1. Modifying batch sizes. To modify a batch volume, first check that the SET/LOCK switch is in the “SET” position on the circuit board. To increase a batch size. Press
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MODELS OT & RT E. Upper Warmer Indicator Lamp A. On/Off Brew Station Warmer Switch Glows whenever the upper warmer switch is in Placing the switch in the upper position supplies the upper position showing that the warmer is on. power to the brew station warmer and enables brew- ing. Placing the switch in the lower position cuts power to the brew station warmer and stops brewing. F. Left Rear Warmer Rotary Switch Stopping a brew cycle after it has been started will Rotating the knob to the "ON"
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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 electric components have 120 volt ac voltage on their terminals. Shorting of terminals or the application of external vol
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Brew cycle will not start. (cont.) 4. On/Off Brew Station Warmer Refer to Service - On/Off Brew Sta- Switch tion Warmer Switch for testing pro- cedures. See page 19. Refer to Service - Start Switch for 5. Start Switch testing procedures. See page 25. Refer to Service - Brew Timer for 6. Brew Timer testing procedures. See page 13 or 14. 7. Solenoid Valve Refer to Service - Solenoid Valve for testing procedures. See page 24. Refer to Servic
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Spitting or unusual steaming from 1. Control Thermostat Refer to Service - Control Thermo- sprayhead. stat for testing procedures. See page 16. 2. Lime build-up Inspect the tank assembly for exces- CAUTION: Tank and tank compo- sive lime deposits. Delime as re- nents should be delimed regularly quired. depending on local water conditions. Excessive mineral build-up on stain- less steel surfaces can initiate cor- rosive reactions resulting i
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy 1. Beverage left in decanter The brew cycle should be started Beverage overflows decanter. only with an empty decanter under the funnel. 1. Type of paper filters BUNN® paper filters should be used Weak beverage. for proper extraction. 2. Coffee A sufficient quantity of fine or drip grind coffee should be used for proper extraction. 3. Sprayhead B.O.M. sprayhead #01082.0000 should be used to properly wet the bed of ground coffee in the funnel.
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SERVICE (cont.) If voltage is present as described, reconnect the po- Brew Timer (Early Models) larized, three-pin connectors, and proceed to #6. If voltage is not present as described, refer to the Wir- ing Diagrams and check the brewer wiring harness. 6. Disconnect the in-line connectors on the black and white wires from the timer to the solenoid. 7. Check the voltage across the black and white wires with a voltmeter when the On/Off brew sta- tion warmer switch is in the upper position and the
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SET LOCK J1 J2 SERVICE (cont.) 6. Disconnect the white/blue wire from terminal TL3 and the blue/black wire from terminal TL5. With a DIGITAL BREW TIMER (Late Models) voltmeter, check for continuity across the two wires when the "ON/OFF" switch is in the "ON" position (upper) and the START switch is pressed. Connect the brewer to the power source. The indication must be: a) 120 volts ac for two wire 120 volt models. b) 200 or 240 volts ac for two wire 200 or 240 volt models and three wire 12
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SERVICE (cont.) 2. Setting brew volumes. To set a brew volume, first check that the SET/LOCK switch is in the “SET” DIGITAL BREW TIMER (Late Models)(cont.) position on the circuit board. Place the ON/OFF switch 3. Remove all wires from the timer. in the “ON” position, press and hold the START switch 4. Attach all wires to the replacement timer board until three distinct clicks are heard and then release prior to installation to the component mounting the switch. (Failure to release the switch w
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HI SERVICE (cont.) The indication must be as described in step 2. Voltage must not be indicated across these ter- Control Thermostat minals when the thermostat is turned "OFF" (fully counterclockwise). 5. Disconnect the brewer from the power source. If voltage is present as described, the control thermo- stat is operating properly. If voltage is not present as described, replace the con- trol thermostat. Removal and Replacement: 1. Remove both wires from the control thermostat terminals. 2. Remo
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SERVICE (cont.) If voltage is present as described, proceed to #4. If voltage is not present as described, refer to the Wir- Warmer Switch(es) ing Diagrams and check the brewer wiring harness. OT: On/Off Brew Station & Upper RT: On/Off Brew Station 4. Check the voltage across the other switch termi- nal and the terminal on the indicator lamp with white or red wires with a voltmeter when the switch is in the upper position. Connect the brewer to the power source. The indication must be as descr
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