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CONTENTS Introduction ............................................................... 2 User Notices .............................................................. 3 Electrical Requirements ............................................. 4 Plumbing Requirements ............................................ 4 Initial Set-Up .............................................................. 5 Operating Controls..................................................... 6 Coffee Brewing ....................................
USER NOTICES Carefully read and follow all notices on the equipment and in this manual. They were written for your protection. All notices on the equipment should be kept in good condition. Replace any unreadable or damaged labels. 00658.0000 00831.0000 ! WARNING Fill water tank before turning -on thermostat or connecting appliance to power source. Use only on a properly protected circuit capable of the rated load. Electrically ground the chassis. Follow national/local electrical codes.
ELECTRICAL REQUIREMENTS CAUTION - Do not connect the brewer to the power source until specified in Initial Set-Up. L2 RED WHITE NEUTRAL L1 BLACK 120V.A.C. WHITE L2 RED 120V.A.C. 208 or 240V.A.C. NEUTRAL L1 BLACK RED NEUTRAL L1 BLACK 200 OR 240V.A.C. 100V.A.C. 120V.A.C. L1 BLACK MODELS OL15 & 20 require 2wire, grounded service rated 120 volts ac, 15 or 20 amp respectively, single phase, 60 Hz.
PLUMBING REQUIREMENTS (Cont.) Plumbing Hook-Up Model OL15 has an attached water strainer, proceed to step 2. Models OL20, OL35, & RL35, 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 bottom bracket. 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 water supply.
OPERATING CONTROLS A. On/Off Brew Station Warmer Switch Placing the switch in the upper position supplies power to the brew station warmer and enables brewing. Placing the switch in the lower position cuts power to the brew station warmer and stops brewing. Stopping a brew cycle after it has been started will not stop the flow of water into the funnel until the tank syphons down to its proper level.
COFFEE BREWING Start each brew cycle with an empty, clean, half-gallon decanter. 1. 2. 3. 4. 5. 6. 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. Place the On/Off brew station warmer switch in the upper position. Momentarily press the start switch. When brewing is completed, simply discard the grounds and filter. CLEANING 1. 2. 3.
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.
TROUBLESHOOTING (cont.) Remedy Problem Probable Cause Brew cycle will not start. (cont.) 4. On/Off Brew Station Warmer Refer to Service - On/Off Brew Station Warmer Switch for testing proSwitch cedures. See page 16. 5. Start Switch Refer to Service - Start Switch for testing procedures. See page 19. 6. Relay Refer to Service - Relay for testing procedures. See page 23. 7. Solenoid Valve Refer to Service - Solenoid Valve for testing procedures. See page 22. Water flows into fill basin continu- 1.
TROUBLESHOOTING (cont.) Problem Probable Cause Spitting or unusual steaming from 1. Control Thermostat sprayhead. 2. Lime build-up CAUTION Tank and tank components should be delimed regularly depending on local water conditions. Excessive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks. Remedy Refer to Service - Control Thermostat for testing procedures. See page 13. Inspect the tank assembly for excessive lime deposits. Delime as required.
TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Beverage overflows decanter. 1. Beverage left in decanter 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. 3. Sprayhead B.O.M. sprayhead #01082.0000 should be used to properly wet the bed of ground coffee in the funnel.
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 WARNING - Disconnect the brewer from the power source before the removal of any panel or the replacement of any component. The control thermostat, solenoid valve and relay are located under the top cover or top warmer housing, FIG.
SERVICE (cont.) Control Thermostat 5. The indication must be as described in step 2. Voltage must not be indicated across these terminals when the thermostat is turned "OFF" (fully counterclockwise). Disconnect the brewer from the power source. If voltage is present as described, the control thermostat is operating properly. If voltage is not present as described, replace the control thermostat. F Removal and Replacement: 1. Remove the top cover or top warmer housing from the brewer to gain access. 2.
SERVICE (cont.) 5. Warmer(s) OL: Brew Station & Upper RL: Left Rear, Left Front, Brew Station, & Right Front Check for continuity from the wire terminal of the white or red wire to the splice or indicator lamp using the chart below. If continuity is present as described, proceed to #6. If continuity is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness. 6. ION ANT UT D DEC CA DISCAR Check for continuity across the two terminals on the warmer.
SERVICE (cont.) 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 harness. Warmer RL: Right Rear Three Heat 5. ! ION ANT UT D DEC CA DISCAR IF: PN: If continuity is present as described, the warmer is operating properly. If continuity is not present as described, replace the warmer. ER D CKE . CRAATCHED TY . SCRED DRY N EMP ME WHE FLA IC . BOIL TED HIGH CTR . HEA ON D ELE D TS .
If voltage is present as described, proceed to #4. If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness. SERVICE (cont.) Warmer Switch(es) OL: On/Off Brew Station & Upper RL: On/Off Brew Station ! ION ANT UT D DEC CA DISCAR IF: 4. 5. ER D CKE . CRAATCHED TY . SCRED DRY N EMP ME WHE FLA IC . BOIL TED HIGH CTR .
3. SERVICE (cont.) Warmer Switch(es) RL: Left Rear, Left Front, & Right Front 4. ! ION ANT UT D DEC CA DISCAR IF: D CKE . CRAATCHED TY . SCRED DRY N EMP ME WHE FLA IC . BOIL TED HIGH CTR . HEAD ON D ELE TS . USEEXPOSEINJURY ION TEN TS ORAT . ORRISKS MEN CORP CON TIC ELE PLY NEL HOT -O-MA COM BUNN FUNARE 1985 E TO LUR FAI PN: If voltage is present as described, the switch is operating properly. If voltage is not present as described, replace the switch.
SERVICE (cont.) 5. Check the voltage across terminals L1 and 2 with a voltmeter when the switch is in the "High" position. Connect the brewer to the power source. The indication must be as described in step 1. Voltage must not be present across these terminals in the "Off", "Low", or "Med" positions. 6. Disconnect the brewer from the power source. 7. Check the voltage across terminals N and 1 with a voltmeter when the switch is in the "Med" or "High" positions. Connect the brewer to the power source.
SERVICE (cont.) If continuity is present as described, reconnect the wires, the switch is operating properly. If continuity is not present as described, replace the switch. Start Switch Removal and Replacement: 1. Remove all wires from the switch terminals. 2. Compress the clips inside the housing and gently push the switch through the opening. 3. Push the new switch into the opening and spread the clips to hold the switch captive in the housing. 4. Refer to FIG. 18 when reconnecting the wires.
SERVICE (cont.) 4. c) 100 volts ac for two wire 100 volt models. Disconnect the brewer from the power source. Indicator Lamp(s) If voltage is present, the indicator lamp is operating properly. If voltage is not present, replace the indicator lamp. Removal and Replacement: 1. Compress the clips inside the housing and gently push the indicator lamp through the opening. 2. Remove the wires from the indicator lamp terminals. 3. Refer to FIG. 21 when reconnecting the wires. 4.
SERVICE (cont.) 4. Limit Thermostat Check for continuity across the limit thermostat terminals. If continuity is present as described, the limit thermostat is operating properly. If continuity is not present as described, replace the limit thermostat. Removal and Replacement: 1. Remove both wires from the limit thermostat terminals. 2. Carefully slide the limit thermostat out from under the retaining clip. 3. Carefully slide the new limit thermostat into the retaining clip. 4. Refer to FIG.
4. SERVICE (cont.) Solenoid Valve 5. F If the sound is heard as described and water will not pass through the solenoid valve, there may be a blockage in the water line before or after the solenoid valve or, the solenoid valve may require inspection for wear, and removal of waterborne particles. If the sound is not heard as described, replace the solenoid valve. OF HI Check the solenoid valve for coil action.
SERVICE (cont.) Relay HI F OF 5. BUNN 6. 7. 8. P1478 FIG. 26 RELAY Location: The relay is located under the top cover or top warmer housing, FIG. 26. Test Procedure: 1. Disconnect the plug terminal from the relay to the main wiring harness. Check the voltage across the pins of the black wire (P3) and white wire (P2) on the main harness with a voltmeter when the On/Off brew station warmer switch is in the upper “ON” position. Connect the brewer to the power source.
SERVICE (cont.) Tank Heater FIG. 27 TANK HEATER P1715 Location: The tank heater is located in the bottom of the tank assembly, FIG. 27. Test Procedure: 1. Check the voltage across the black and white or red wires on the tank heater with a voltmeter when the control thermostat is turned "ON" (fully clockwise). Connect the brewer to the power source. The indication must be: a) 120 volts ac for two wire 120 volt models.
SERVICE (cont.) If continuity is present as described, reconnect the wires as shown in FIG. 30, the switches are operating properly. If continuity is not present as described, replace the failed switch. OF HI F Water Level and Overflow Safety Switch BUNN P1478 FIG. 29 WATER LEVEL and OVERFLOW SAFETY SWITCHES Location: The water level and overflow safety switches are located under the top cover or top warmer housing and inside and front of the tank fill basin, FIG. 29. Test Procedure: 1.
SCHEMATIC WIRING DIAGRAM OL L1 N L2 GREEN SW. & THERMOSTAT LIMIT THERMOSTAT BLK BLU BLK WHI (OL15 & 20) RED (OL35) TANK HEATER WHI WHI "KEEP WARM" HEATER BLK BLK P3 P2 & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR. WHI BLK WHI P2 WHI UPPER WARMER BLK BLK WHI BLK WHI BREW STATION WARMER BREW SW BLK SOL LEVEL SW PNK PNK BLK P3 BLK BLU P1 BLU WHI P2 WHI K1 N.O.
SCHEMATIC WIRING DIAGRAM OLA L1 L2 GRN/YEL SW. & THERMOSTAT LIMIT THERMOSTAT BLK BLK BLU TANK HEATER RED WHI WHI "KEEP WARM" HEATER IND RED BLK BLK P3 P2 BLK UPPER WARMER IND SW BLK BLK RED RED BLK RED BREW STATION WARMER BREW SW BLK SOL LEVEL SW PNK PNK BLK P3 BLK BLU P1 BLU WHI P2 WHI K1 K1 N.O. SAFETY SW PNK PNK BLK P3 BLK BLU P1 BLU WHI P2 OPTIONAL LOW WATER PRESSURE VALVE WHI BLK BLK VIO SOL BR. RECT WHI/VIO 10651.
SCHEMATIC WIRING DIAGRAM OL25B GRN/YEL L1 BLK-12 BLK-12 TANK HEATER N WHI-12 T1 L1 K2 N.O WHI-12 L2 T2 K2 N.O HEATER INDICATOR LIMIT THERMOSTAT SW. & THERMOSTAT BLK BLU BLK WHI K2 BLK WHI BLK BLK WHI BREW STATION WARMER LEVEL SW PNK PNK BLK SOL K1 N.O. BLK P3 BLK BLU P1 BLU WHI P2 WHI K1 BREW SW OVERFLOW PROTECTION SW PNK PNK BLK BLK P3 BLK BLU P1 BLU WHI P2 WHI P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR.
SCHEMATIC WIRING DIAGRAM OL35B L1 L2 READY INDICATOR BLK BLU LIMIT THERMOSTAT BLK GREEN SW. & THERMOSTAT BLK TANK HEATER BLU P2 & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR. IND SW BLK WHI BLK P3 WHI BLK BLK RED RED BLK BLK P2 UPPER WARMER IND SW RED RED BREW STATION WARMER BREW SW BLK SOL LEVEL SW SAFETY SW PNK PNK PNK PNK BLK P3 BLK BLU P1 BLU WHI P2 WHI K1 N.O.
SCHEMATIC WIRING DIAGRAM RL L1 N GREEN L2 SW. & THERMOSTAT LIMIT THERMOSTAT BLK BLU BLK RED TANK HEATER WHI WHI "KEEP WARM" HEATER BLK WHI BLK BLK WHI BREW STATION WARMER BREW SW LEVEL SW PNK PNK BLK SOL BLK P3 BLK BLU P1 BLU WHI P2 WHI K1 SAFETY SW PNK PNK N.O. K1 BLK BLK P3 BLK BLU P1 BLU WHI P2 WHI P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR. OPTIONAL LOW WATER PRESSURE VALVE WHI VIO BR.
SCHEMATIC WIRING DIAGRAM RLA L1 L2 GRN/YEL BLK LIMIT THERMOSTAT SW. & THERMOSTAT BLU TANK HEATER BLK RED "KEEP WARM" HEATER WHI WHI INDICATOR BLK BLK BLK RED RED BREW STATION WARMER BREW SWITCH LEVEL SW BLK SOL PNK PNK BLK P3 BLK BLU P1 BLU WHI P2 WHI SAFETY SW K1 N.O. K1 PNK PNK BLK BLK P3 BLK BLU P1 BLU WHI P2 RED OPTIONAL LOW WATER PRESSURE VALVE VIO WHI BR. RECT BLK P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR.
SCHEMATIC WIRING DIAGRAM RL25B READY INDICATOR BLK BLU L1 LIMIT THERMOSTAT BLK N GRN/YEL SW. & THERMOSTAT BLU BLK BLK BLK K2 RED K2 RED TANK HEATER N.O RED K2 N.O BLK RED BLK BLK RED BREW STATION WARMER BREW SW LEVEL SW PNK PNK BLK SOL BLK P3 BLK BLU P1 BLU WHI P2 WHI SAFETY SW PNK PNK BLK BLK K1 N.O. BLU P3 BLK P1 BLU WHI P2 RED K1 P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR.
SCHEMATIC WIRING DIAGRAM RL35B L1 READY INDICATOR BLK BLU LIMIT THERMOSTAT BLK L2 GREEN SW. & THERMOSTAT TANK HEATER BLK BLU RED IND RED BLK BLK BREW STATION WARMER BLK RED BREW SW LEVEL SW PNK PNK BLK SOL BLK P3 BLK BLU P1 BLU WHI P2 WHI K1 SAFETY SW PNK PNK BLK P3 BLK N.O. BLU P1 BLU WHI P2 K1 BLK RED P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR. OPTIONAL LOW WATER PRESSURE VALVE WHI BLK VIO SOL BR.