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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.
! ON NTER UTI DECA CA DISCARD IF: D CKEHED TY . CRAATC DRY EMP ME . SCR LED WHENFLA IC . BOITED HIGH CTR ELE . HEAD ON D OSE . USEEXP Y TS TS . OR MEN INJUR N EN ATIO ELE KS NT RIS IC CORPOR CO LY EL T MAT NN E HO COMP N-OFU AR BUN TO 1985 RE ILU FA PN: 658 ! ON NTER UTI DECA CA DISCARD IF: D CKEHED TY . CRAATC DRY EMP ME . SCR LED WHENFLA IC . BOITED HIGH CTR ELE . HEAD ON D OSE . USEEXP Y TS TS .
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 15. 5. Start Switch Refer to Service - Start Switch for testing procedures. See page 17. 6. Relay Refer to Service - Relay for testing procedures. See page 21. 7. Solenoid Valve Refer to Service - Solenoid Valve for testing procedures. See page 20. 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.
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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.
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SERVICE (cont.) 4. Warmer Switch(es) RL: Left Rear, Left Front, Right Rear & Right Front Disconnect the brewer from the power source. If voltage is present as described, the switch is operating properly. If voltage is not present as described, replace the switch. ION ANT UT D DEC CA DISCAR Removal and Replacement: 1. Remove the knob from the switch. 2. Loosen the 5/8" nut on the switch shaft and push the switch through the opening. 3. Remove the wires from the switch terminals. 4. Refer to FIG.
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 ! ION ANT UT D DEC CA DISCAR 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.
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. ! ION ANT UT D DEC CA DISCAR 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. 17 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. Check the solenoid valve for coil action. Connect the brewer to the power source, place the On/Off brew station warmer switch in the upper position, press and release the start switch. Listen carefully in the vicinity of the solenoid valve for a "clicking" sound as the coil magnet attracts and after the approximate setting of the level float switch, repels the plunger. Disconnect the brewer from the power source.
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SERVICE (cont.) Tank Heater FIG. 23 TANK HEATER P1715 Location: The tank heater is located in the bottom of the tank assembly, FIG. 23. 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.
F OF HI BUNN Page 23
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 BLK WHI BLK WHI BREW STATION WARMER BREW SW LEVEL SW PNK PNK BLK SOL BLK P3 BLK BLU P1 BLU WHI P2 WHI SAFETY SW PNK PNK K1 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 LIMIT THERMOSTAT BLK BLU BLK TANK HEATER "KEEP WARM" HEATER WHI BLK WHI RED RED BLK 220-240 VOLTS AC 2 WIRE SINGLE PHASE RED 32422.
SCHEMATIC WIRING DIAGRAM RL35B L1 L2 GREEN LIMIT THERMOSTAT BLK BLU BLK RED BLK RED BLK BLK RED BREW SW BLK SOL LEVEL SW PNK PNK K1 N.O. BLK P3 BLK BLU P1 BLU WHI P2 WHI K1 SAFETY SW PNK PNK BLK BLK P3 BLK BLU P1 BLU WHI P2 RED P1, P2, & P3 ARE PINS OF A OPTIONAL LOW WATER PRESSURE VALVE WHI BLK VIO BR. RECT WHI/VIO SOL BLK BLK RED BLK BLK RED BLK BLK RED 200 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ 32421.