Instruction/ maintenance manual of the product RT Bunn
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OT & R T 10021.0000G 7/00 © 1989 BUNN-O-MATIC CORPORATION BUNN-O-MA TIC CORPORA TION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 F AX: (217) 529-6644 BU N N ® OPE.
Page 2 CONTENTS Introduction ............................................................... 2 User Notices .............................................................. 3 Electrical Requirements ............................................. 4 Plumbing Requirements .
Page 3 00656.0000 00688.0000.
Page 4 MODELS OT15 & 20 require 2- wire, grounded service rated 120 volts ac, 15 or 20 amp re- spectively , single phase, 60 Hz. Model 15 has an attached cordset.
Page 5 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.
Page 6 MODEL RT C A U T IO N D IS C A R D D E C A N T E R I F : . C R A C K E D . S C R A T C H E D . B O IL E D D R Y . H E A T E D W H E N E M P T Y .
Page 7 MODELS OT & R T A. On/Off Brew Station Warmer Switch Placing the switch in the upper position supplies 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.
Page 8 Problem Equipment will not operate. Brew cycle will not start. Probable Cause 1. No power or incorrect voltage 1. No water 2. Water Strainer 3. Flow Control Remedy (A) Connect the brewer to the power source. (B) Check the terminal block for the proper voltages.
Page 9 TROUBLESHOOTING (cont.) Problem Brew cycle will not start. (cont.) Water flows into tank continuously (On/Off brew station warmer switch "OFF"). Water flows into tank continuously (On/Off brew station warmer switch "ON"). Water is not hot.
Page 10 TROUBLESHOOTING (cont.) Problem Spitting or unusual steaming from sprayhead. Inconsistent beverage level in de- canter . Consistently high or low beverage level in decanter .
Page 11 TROUBLESHOOTING (cont.) Problem Beverage overflows decanter . Weak beverage. Brewer is making unusual noises. Probable Cause 1. Beverage left in decanter 1. T ype of paper filters 2. Coffee 3. Sprayhead 4. Funnel loading 5. Water temperatur e 1.
Page 12 FIG. 1 ACCESS P ANELS SERVICE This section provides procedures for testing and replacing various major components used in this brewer should service become necessar y . Refer to T roubleshooting for assistance in determining the cause of any problem.
Page 13 FIG. 2 BREW TIMER FIG. 3 BREW TIMER WIRING SERVICE (cont.) Brew Timer (Early Models) Location: The brew timer is located behind the front panel to the right of the tank, FIG.
Page 14 T L 5 T L 4 T L 3 T L 2 T L 1 J2 SET LOCK L O C K S E T J1 DIGITAL BREW TIMER (Late Models) P2201 FIG. 4 DIGITAL BREW TIMER Location: The timers are located inside the front of the trunk on the upper right side of the component brackets. Test Procedure.
Page 15 3. Remove all wires from the timer. 4. Attach all wires to the replacement timer board prior to installation to the component mounting bracket. Refer to FIG. 5 when reconnecting the wires. 5. Install new circuit board with spacers (as re- quired) to the component mounting bracket.
Page 16 FIG. 6 CONTROL THERMOST A T FIG. 7 THERMOST A T WIRING SERVICE (cont.) Control Thermostat Location: The control thermostat is located behind the front panel, FIG. 6 to the left of the tank. T o test the control ther mostat, access will also be needed to the tank heater located in the top of the brewer .
Page 17 FIG. 8 W ARMERS FIG. 9 W ARMERS FIG. 10 WARMER WIRING SERVICE (cont.) Warmer(s) OT : Brew Station & Upper RT : Left Rear , Left Front, Brew Station, & Right Front Location: OT : One of the warmers is beneath the brew funnel and the other is on the top lid, FIG.
Page 18 FIG. 11 THREE HEA T WARMER FIG. 12 THREE HEA T WARMER WIRING SERVICE (cont.) Warmer R T : Right Rear Three Heat If continuity is present as described, proceed to #5. If continuity is not present as described, refer to the Wiring Diagrams and check the brewer wiring har - ness.
Page 19 FIG. 13 W ARMER SWITCHES FIG. 14 W ARMER SWITCHES FIG. 15 WARMER SWITCH WIRING SERVICE (cont.) Warmer Switch(es) OT : On/Off Brew Station & Upper RT : On/Off Brew Station If voltage is present as described, proceed to #4. If voltage is not present as described, refer to the Wir - ing Diagrams and check the brewer wiring harness.
Page 20 FIG. 16 W ARMER SWITCHES FIG. 17 WARMER SWITCH WIRING SERVICE (cont.) Warmer Switch(es) R T : Left Rear , Left Front, & Right Front Location: These warmer switches are the two at the left and the left most one on the right of the base as viewed from the front, FIG.
Page 21 FIG. 18 THREE HEA T WARMER SWITCH FIG. 19 THREE HEA T WARMER SWITCH WIRING SERVICE (cont.) Warmer Switch(es) RT : Right Rear Three Heat Rotar y 5. Check the voltage across terminals L1 and 2 with a voltmeter when the switch is in the "High" posi- tion.
Page 22 FIG. 22 INDICA TOR LAMP WIRING FIG. 20 INDICA TOR LAMP - MODEL OT FIG. 21 INDICA TOR LAMP - MODEL RT SERVICE (cont.) Indicator Lamp(s) c) 100 volts ac for two wire 100 volt models. 4. Disconnect the brewer from the power source. If voltage is present, the indicator lamp is operating properly .
Page 23 FIG. 23 LIMIT THERMOST A T FIG. 24 LIMIT THERMOST A T WIRING SERVICE (cont.) Limit Thermostat 4. Check for continuity across the limit thermostat terminals. If continuity is present as described, the limit thermo- stat is operating properly . If continuity is not present as described, replace the limit thermostat.
Page 24 FIG. 25 SOLENOID V AL VE FIG. 26 SOLENOID V AL VE WIRING SERVICE (cont.) Solenoid Valve 4. Check the solenoid valve for coil action. Con- nect the brewer to the power sour ce, place the On/Off brew station warmer switch in the upper position, press and release the start switch.
Page 25 FIG. 28 ST ART SWITCH - MODEL R T FIG. 27 ST ART SWITCH - MODEL OT FIG. 29 ST ART SWITCH WIRING SERVICE (cont.) Start Switch Location: The start switch is located in the base, below and to the right of the brew station, FIG.s 27 & 28. T est Pr ocedure: 1.
Page 26 FIG. 30 T ANK HEA TER FIG. 31 T ANK HEA TER WIRING SERVICE (cont.) T ank Heater Removal and Replacement: 1. Remove the wires to the tank heater and limit thermostat terminals. 2. Gently pull the thermostat tube with grommet out of the tank lid.
Page 27 Thermal Cut-off Location: The thermal cut-off is located on the tank heater, FIG. 32. SERVICE (cont.) Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the thermal cut-off from the tank heater terminal and the wiring harness.
Page 28 WHI/GRN WHI/BLU BLK BREW STATION WARMER WHI BLU BLU/BLK WHI WHI BREW TIMER BLK BLK P1 P3 P2 SCHEMATIC WIRING DIAGRAM OT BLK BLK BLK WHI P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR.
Page 29 BLK PNK GRY BLK BLK BLU LIMIT THERMOSTAT N L1 BLK BREW STATION WARMER 130W WHI BLU BLU/BLK WHI WHI BLK BLK P1 P3 P2 GREEN SCHEMATIC WIRING DIAGRAM OT BLK L2 BLK BLK WHI P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR.
Page 30 BLK BLK BLK BLU LIMIT THERMOSTAT SW. & THERMOSTAT L1 BLK BREW STATION WARMER BLU BLU/BLK BLK BLK P1 P3 P2 GRN/YEL BLK L2 BLK BLK P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR 10282.
Page 31 BLK BLK BREW STATION WARMER BLU BLU/BLK BLK BLK P1 P3 P2 SCHEMATIC WIRING DIAGRAM OT25B BLK BLK BLK P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR.
Page 32 BLK BLK BLK BLU LIMIT THERMOSTAT L1 BLK BREW STATION WARMER BLU BLU/BLK BLK BLK P1 P3 P2 GRN/YEL SCHEMATIC WIRING DIAGRAM OT35B BLK L2 BLK BLK P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR.
Page 33 BLK WARMER WHI BLK SCHEMATIC WIRING DIAGRAM RT BLK WHI "KEEP WARM" HEATER WHI 10277.0000D 7/00 © 1988 BUNN-O-MATIC CORPORATION 120/240 VOLTS AC 3 WIRE SINGLE PHASE 60 HZ WHI BLK BLK.
Page 34 BLK BLU LIMIT THERMOSTAT SW. & THERMOSTAT TANK HEATER BLK L1 BLK WARMER BLU BLK BLK P3 10283.0000C 7/00 © 1988 BUNN-O-MATIC CORPORATION GRN/YEL SCHEMATIC WIRING DIAGRAM RTA BLK L2 RED BLK BLK P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR.
Page 35 BLK WARMER BLU BLK BLK P3 SCHEMATIC WIRING DIAGRAM RT25B BLK BLK BLK P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR. BLK BLK BLK BLK BLK BLK LEFT FRONT WARMER RIGHT FRONT WARMER .
Page 36 BLK BLU LIMIT THERMOSTAT TANK HEATER BLK L1 BLK WARMER BLU BLK BLK P3 GRN/YEL SCHEMATIC WIRING DIAGRAM RT35B BLK L2 RED BLK BLK P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR.
An important point after buying a device Bunn RT (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Bunn RT yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Bunn RT - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Bunn RT you will learn all the available features of the product, as well as information on its operation. The information that you get Bunn RT will certainly help you make a decision on the purchase.
If you already are a holder of Bunn RT, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Bunn RT.
However, one of the most important roles played by the user manual is to help in solving problems with Bunn RT. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Bunn RT along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
