Bunn OT Installation & Operating Manual

S/n rt00005364 & up

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Operating & service manual (36 pages)

Illustrated parts catalog (47 pages)

Operating & service manual (176 pages)

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Page 1 To ensure you have the latest revision of the Operating Manual, or to view the Illustrated Parts Catalog, Programming Manual, or Service Manual, please visit the Bunn-O-Matic website, at www.bunn.com. This is absolutely FREE, and the quickest way to obtain the latest catalog and manual updates. For Technical Service, contact Bunn-O-Matic Corporation at 1-800-286-6070.
Page 2 AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND. In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost profits, lost sales, loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute equipment, facilities or services, or any other special, incidental or consequential damages.
Page 3: Table Of Contents
FAILURE TO COMPLY RISKS EQUIPMENT DAMAGE, FIRE, OR SHOCK HAZARD READ THE ENTIRE OPERATING MANUAL BEFORE BUYING OR USING THIS PRODUCT PN: 00658.0000G 02/08 © 1985 BUNN-O-MATIC CORPORATION THIS APPLIANCE IS HEATED WHENEVER 00658.0000 CONNECTED TO A POWER SOURCE 00831.0000F 3/98 ©1998 BUNN-O-MATIC CORPORATION 00831.0000...
Page 4: Electrical Requirements
ELECTRICAL REQUIREMENTS CAUTION - Do not connect the brewer to the power source until specified in Initial Set-Up. L2 RED 200, 230 or 240V A.C. L1 BLACK MODELS OT15 & 20 require MODELS OTA, RTA & RT35B MODELS OT35 & RT35 require M O D E L RT r e q u i r e s 2-wire, grounded service rated require 2-wire, grounded ser-...
Page 5: Plumbing Requirements
25 feet from the 1/2” water supply line. A tight coil of copper tubing in the water line will facilitate moving the brewer to clean the counter top. Bunn-O-Matic does not recommend the use of a saddle valve to install the brewer.
Page 6: Initial Setup
INITIAL SETUP CAUTION - The brewer must be disconnected from the power source throughout the initial set-up, except when specified in the instructions. Remove the front panel. Rotate the control thermostat knob fully clock- Rotate the control thermostat knob fully counter- wise to the “ON”...
Page 7: Adjusting Brew Volumes
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.
Page 8: Coffee Brewing
P1688 Start each brew cycle with an empty, clean, half-gallon decanter. Insert a BUNN® filter into the funnel. Pour the fresh coffee into the filter and level the bed of grounds by gently shaking. Slide the funnel into the funnel rails.
Page 9: Troubleshooting
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 person- nel.
Page 10 TROUBLESHOOTING (cont.) Remedy Problem Probable Cause Brew cycle will not start. (cont.) 4. On/Off Brew Station Warmer Refer to Service - On/Off Brew Switch Station Warmer Switch for testing procedures. See page 18. 5. Start Switch Refer to Service - Start Switch for testing procedures.
Page 11 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 ex- cessive lime deposits. Delime as CAUTION required.
Page 12 The brew cycle should be started only with an empty decanter under the funnel. Weak beverage. 1. Type of paper filters BUNN® paper filters should be used for proper extraction. 2. Coffee A sufficient quantity of fine or drip grind coffee should be used for proper extraction.
Page 13: Service
SERVICE This section provides procedures for testing and replacing various major components used in this brewer should service become necessary. Refer to Troubleshooting for assistance in determining the cause of any problem. Component Access Contents Brew Timer (Early Models)........13 WARNING - Disconnect the brewer from the power Digital Timer (Late Models) ........
Page 14: Brew Timer (Early Models)
If voltage is present as described, reconnect the polar- SERVICE (cont.) ized, three-pin connectors, and proceed to #6. If voltage is not present as described, refer to the Wir- Brew Timer (Early Models) ing Diagrams and check the brewer wiring harness. Disconnect the in-line connectors on the black and white wires from the timer to the solenoid.
Page 15: Digital Timer (Late Models)
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.
Page 16 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”...
Page 17: Control Thermostat
SERVICE (cont.) these terminals when the thermostat is turned “OFF” (fully counterclockwise). Control Thermostat 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 control thermostat.
Page 18: Warmer(S)
SERVICE (cont.) Check for continuity from the wire terminal of the white or red wire to the splice or indicator lamp Warmer(s) using the chart below. Brew Station & Upper Left Rear, Left Front, Brew Station, Right Rear & Right If continuity is present as described, proceed to #6.
Page 19: Warmer Switch(Es)
SERVICE (cont.) Warmer Switch(es) If voltage is present as described, proceed to #4. On/Off Brew Station & Upper If voltage is not present as described, refer to the Wir- On/Off Brew Station ing Diagrams and check the brewer wiring harness. Check the voltage across the other switch ter- minal and the terminal on the indicator lamp with white or red wires with a voltmeter when...
Page 20: Rt: Left Rear, Left Front, Right Rear
Check the voltage across terminal 1 and the white SERVICE (cont.) or red wire on the terminal block with a voltmeter when the switch is in the “ON” position. Connect Warmer Switch(es) the brewer to the power source. The indication RT: Left Rear, Left Front, Right Rear &...
Page 21: Indicator Lamp(S)
SERVICE (cont.) Indicator Lamp(s) Disconnect the brewer from the power source. If voltage is present, the indicator lamp is operating properly. If voltage is not present, replace the indicator lamp. Removal and Replacement: Compress the clips inside the housing and gently push the indicator lamp through the opening.
Page 22: Limit Thermostat
SERVICE (cont.) Check for continuity across the limit thermostat 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. Removal and Replacement: Remove both wires from the limit thermostat terminals.
Page 23: Solenoid Valve
Check the solenoid valve for coil action. Connect SERVICE (cont.) the brewer to the power source, place the On/Off brew station warmer switch in the upper posi- Solenoid Valve tion, press and release the start switch. Listen carefully in the vicinity of the solenoid valve for a “clicking”...
Page 24: Start Switch
SERVICE (cont.) Start Switch If continuity is present as described, reconnect the wires, the switch is operating properly. If continuity is not present as described, replace the switch. Removal and Replacement: Remove all wires from the switch terminals. Compress the clips inside the housing and gently push the switch through the opening.
Page 25: Tank Heater
SERVICE (cont.) Removal and Replacement: Remove the wires to the tank heater and limit Tank Heater thermostat terminals. Gently pull the thermostat tube with grommet out of the tank lid. Remove the sprayhead and sprayhead nut from the panel on the bottom of the hood. Disconnect the air vent tube from the fitting above the sprayhead panel.
Page 26: Thermal Cut-Off
SERVICE (cont.) Test Procedures: Disconnect the brewer from the power source. Thermal Cut-off Disconnect the thermal cut-off from the tank Location: heater terminal and the wiring harness. The thermal cut-off is located on the tank heater, Check for continuity across the thermal cut-off FIG.
Page 27: Master On/Off Switch
SERVICE (cont.) Master ON/OFF Switch Check for continuity across the two terminals on the switch at L1 BLK and BLK to Main Harness when it is held in the lower position, Fig. 25. Check for continuity across the two terminals on the switch at L2 RED and RED to Main Harness when it is held in the lower position.
Page 28: Wiring Schematics
UPPER WARMER BREW STATION WARMER P1, P2, & BLU/BLK P3 ARE PINS OF A WHI/BLU WHI/GRN POLARIZED THREE-PIN CONNECTOR. 120/240 VOLTS AC BREW 3 WIRE + GND TIMER SINGLE PHASE 60 HZ 10278.0000F 01/07 ©1988 BUNN-O-MATIC CORPORATION Page 28 32440 010308...
Page 29: Wiring Diagrams
WHI/GRN BREW TIMER P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN SELECTOR CONNECTOR. CONTROL BOARD GRINDER INTERFACE CONNECTORS GRN YEL RED 120/240 VOLTS AC 3 WIRE 10280.0000D 7/00 © 1988 BUNN-O-MATIC CORPORATION SINGLE PHASE Page 29 32440 070700...
Page 30 RED/BLK BREW STATION WARMER P1, P2, & P3 ARE PINS OF A BLU/BLK POLARIZED WHI/BLU WHI/GRN THREE-PIN CONNECTOR 240 VOLTS AC 2 WIRE BREW SINGLE PHASE RED/BLK TIMER 50-60 HZ 10282.0000B 7/00 © 1988 BUNN-O-MATIC CORPORATION Page 30 32440 070700...
Page 31 UPPER WARMER BREW STATION WARMER P1, P2, & P3 ARE PINS OF A BLU/BLK POLARIZED WHI/BLU WHI/GRN THREE-PIN CONNECTOR. 100 VOLTS AC 2 WIRE BREW SINGLE PHASE TIMER 50-60 HZ 10635.0000B 7/00 © 1991 Bunn-O-Matic Corporation Page 31 32440 070700...
Page 32 UPPER WARMER BREW STATION WARMER P1, P2, & P3 ARE 200 VOLTS AC PINS OF A BLU/BLK 2 WIRE POLARIZED WHI/BLU WHI/GRN SINGLE PHASE THREE-PIN CONNECTOR. 50-60 HZ 10637.0000B 7/00 © 1991 Bunn-O-Matic Corporation BREW TIMER Page 32 32440 070700...
Page 33 CONNECTOR. OPTIONAL FLASHING INDICATOR SYSTEM WHI/RED L.E.D. INDICATOR TIMER LEFT REAR WARMER LEFT FRONT WARMER RIGHT FRONT WARMER RIGHT REAR WARMER 120/240 VOLTS AC 3 WIRE SINGLE PHASE 60 HZ 32423.0000C 01/07 © 1999 BUNN-O-MATIC CORPORATION Page 33 32440 010308...
Page 34 PINS OF A POLARIZED WHI/BLU WHI/GRN THREE-PIN CONNECTOR. BREW TIMER LEFT REAR WARMER LEFT FRONT WARMER RIGHT FRONT WARMER RIGHT REAR WARMER 240 VOLTS AC 2 WIRE SINGLE PHASE 32417.0000B 7/00 © 1999 BUNN-O-MATIC CORPORATION 50-60 HZ Page 34 32440 070700...
Page 35 PINS OF A POLARIZED WHI/BLU WHI/GRN THREE-PIN CONNECTOR. BREW TIMER LEFT REAR WARMER LEFT FRONT WARMER RIGHT FRONT WARMER RIGHT REAR WARMER 120 VOLTS AC 2 WIRE SINGLE PHASE 32420.0000B 7/00 © 1999 BUNN-O-MATIC CORPORATION 50-60 HZ Page 35 32440 070700...

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