Related Manuals for Bunn System III
Summary of Contents for Bunn System III
- Page 1 BUNN ® ® SYSTEM III OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 27362.0000B 9/00 ©1996 Bunn-O-Matic Corporation...
- Page 2 SPECIFIED HEREIN, TO REPAIR OR, AT BUNN’S SOLE OPTION, 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 USER NOTICES Carefully read and follow all notices in this manual and on the equipment. The notices on this brewer should be kept in good condition. Replace any unreadable or damaged labels. 12364.0000 10044.0000 WARNING HOT WATER 20201.5600 00831.0000 03408.0000 00656.0000 03409.0000 Page 3...
- Page 4 " water supply line. A tight coil of copper tubing in the water line will facilitate moving the brewer to clean the countertop. Bunn-O-Matic does not recommend the use of a saddle valve to install the brewer. The size and shape of the hole made in the supply line by this type of device may restrict water flow.
- Page 5 CAUTION – The brewer must be disconnected from the power source throughout the initial set-up, except when specified in the instructions. 1. Remove the front panel beneath the sprayhead. Models with digital brewer control assembly: Place the tank heater toggle switch at the bottom left of the control assembly in the "OFF" position. Models with electro/mechanical thermostats: Rotate the control thermostat knob fully counterclockwise to the "OFF"...
- Page 6 NOTE – The ON/OFF switch must be in the lighted upper position to initiate and complete a brew cycle. 1. Select the desired batch size. 2. Insert a BUNN ® filter into the funnel. 3. Pour the proper amount of fresh coffee into the filter and level the bed of grounds by gently shaking.
- Page 7 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.
- Page 8 TROUBLESHOOTING (cont.) Problem Brew cycle will not start (cont.) Automatic refill will not operate Probable Cause 3. ON/OFF switch 4. Start switch 5. Timer 6. Dispense Valve 7. Digital Brewer Control 1. No water 2. Water strainer/flow control (.500 GPM) 3.
- Page 9 TROUBLESHOOTING (cont.) Problem Automatic refill will not operate (cont.) Beverage level will not adjust (Selec- tor switch in any position) Water flows into tank continuously (ON/OFF Switch "OFF") Water from tank is not hot Probable Cause 6. Solenoid Valve 1. Selector switch 1.
- Page 10 TROUBLESHOOTING (cont.) Problem Water from tank is not hot (cont.) Server warmer is not hot. Spitting or unusual steaming from sprayhead or airvent. Inconsistent beverage level in server. Probable Cause 5. Triac assembly (DBC) 1. ON/OFF switch 2. Warmer element 1.
- Page 11 23 step 8 Refer to Service - Dispense valve for testing procedures. See page 21 Refer to Adjustments on page 5 step #7. For test procedures see page 15. BUNN ® paper filters should be used for proper extraction. Check sprayhead...
- Page 12 Remedy B.O.M. sprayhead #01082.0002 should be used to properly wet the bed of ground coffee in the funnel. ® The BUNN paper filter should be centered in the funnel and the bed of ground coffee leveled by gentle shak- ing.
- Page 13 TROUBLESHOOTING (cont.) Problem Cannot access the DBC DBC display is blank Probable Cause 1. Digital brewer control 1. Digital brewer control Page 13 Remedy Refer to Service - Digital brewer con- trol for testing procedures. See page 22 step 7 Refer to Service - Digital brewer con- trol for testing procedures.
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Page 14: Table Of Contents
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. WARNING - Inspection, testing, and repair of electri- cal equipment should be performed only by qualified service personnel. -
Page 15: Bypass Valve
SERVICE (cont.) BYPASS VALVE FIG. 2 BYPASS VALVE Location: The bypass valve is located inside the hood on the left side just in front of the tank. Test Procedures: 1. Disconnect the brewer from the power source. 2. With a voltmeter, check the voltage across the white/green wire and the white/violet wire on the bypass valve. -
Page 16: Brewer Selector Switch
SERVICE (cont.) BREW SELECTOR SWITCH FIG. 4 BREW SELECTOR SWITCH Location: The brew selector switch is located in the front of the hood on the lower right side on DBC models and to the right of center on electro/mechanical models. Test Procedure: Timer or DBC 1. - Page 17 SERVICE (cont.) BREW SELECTOR SWITCH (cont.) 7. Install the knob so that the arrow lines up in the 2 gallon position when the switch is turned to the full right position. WHI/VIO to By-Pass Valve WHI/RED to Dispense Valve GRY to GRY Lead on Interface Socket PNK to PNK Lead on Interface Socket...
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Page 18: Contactor Assembly
SERVICE (cont.) CONTACTOR ASSEMBLY (ELECTRO/MECHANICAL ONLY) FIG. 6 CONTACTOR ASSEMBLY Location: The contactor assembly is located inside the hood to the right of the overflow cup. Test Procedures: Mechanical Thermostat 1. Disconnect the brewer from the power source. 2. Disconnect the white wire or the red wire and the black wire of the contactor coil and disconnect the black wire of the control thermostat from the remaining black wire of the contactor coil. - Page 19 SERVICE (cont.) CONTACTOR ASSEMBLY (ELECTRO/MECHANICAL ONLY) (cont.) Removal and Replacement: 1. Remove all wires from the contactor. 2. Remove the two #10-32 screws securing contactor to the inside of the hood. 3. Securely install the new contactor inside the hood. 4.
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Page 20: Control Thermostat
SERVICE (cont.) CONTROL THERMOSTAT (ELECTRO/MECHANICAL ONLY) FIG. 8 CONTROL THERMOSTAT Location: The control thermostat is located inside the front of the brewer in the center of the component bracket. Test Procedures: 1. Disconnect the brewer from the power source. 2. With a voltmeter, check the voltage across the blue wires on the control thermostat and the white insert on the three pole 120/208V, 120/240V ter- minal block or the red insert on two pole 240V... -
Page 21: Dispense Valve
SERVICE (cont.) DISPENSE VALVE FIG. 10 DISPENSE VALVE Location: Dispense valve is located inside the hood directly above the sprayhead. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the wires from the dispense valve and check for continuity across the dispense valve coil terminals. -
Page 22: Digital Brewer Control (Dbc)
SERVICE (cont.) DIGITAL BREWER CONTROL BOARD AND DISPLAY (DBC) FIG. 12 DIGITAL CONTROL BOARD Location The digital control board is located inside the upper front of the trunk on the component bracket. The digital display is located in the upper center of the front of hood. - Page 23 SERVICE (cont.) DIGITAL BREWER CONTROL BOARD AND DISPLAY (DBC) (cont.) heater relay or triac. ("0" means the temperature will be allowed to vary by the value in "set relay temperature difference") 7. If you cannot access the DBC with the password you have entered, the password has been changed.
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Page 24: Triac/Heat Sink
Removal and Replacement NOTE - each triac installation requires the use of an approved silicone heat sink compound. Bunn-O- Matic recommends the use of Dow Corning 340 com- pound or equivalent. It can be purchased direct from Bunn-O-Matic (part number M2522.1000). -
Page 25: Level Control Board And Level Probe
SERVICE (cont.) LEVEL CONTROL BOARD AND LEVEL PROBE (Electro/ mechanical only) FIG. 15 LIQUID LEVEL CONTROL BOARD AND PROBE Location: The level control board is located inside the front of the brewer on the lower left side of the component bracket. - Page 26 SERVICE (cont.) LEVEL CONTROL BOARD AND LEVEL PROBE (Electro/ mechanical only)(cont.) b.) 200 to 240 volts ac for two wire 200 or 240 volt models after a delay of approximately 1 second. 17. Disconnect the brewer from the power source. If voltage is present as described, reinstall the probe, the level control board and level probe are operating properly.
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Page 27: Limit Thermostat
SERVICE (cont.) LIMIT THERMOSTAT FIG. 17 LIMIT THERMOSTAT Location: The limit thermostat is located inside the hood on the tank lid to the left of the tank heater. Test Procedure: 1. Disconnect the brewer from the power supply. 2. Disconnect both black wires from the limit ther- mostat. -
Page 28: On/Off Switch (Warmer)
SERVICE (cont.) ON/OFF (Warmer) SWITCH FIG. 19 ON/OFF SWITCH Location: The ON/OFF (Warmer) switch is located on the front of the hood to the right of the start switch. Test Procedure: 1. Disconnect the brewer from the power source. 2. Viewing the switch from the back remove the red or white wire from the upper right terminal and the black wire from the center terminal. -
Page 29: Overflow Protection Switch
SERVICE (cont.) OVERFLOW PROTECTION SWITCH FIG. 21 OVERFLOW PROTECTION SWITCH Location: The overflow protection switch is located inside the hood on the tank inside the copper overflow cup. To test the overflow protection switch, access will also be needed to the level control board or DBC board assembly and terminal block. -
Page 30: Solenoid (Refill)
SERVICE (cont.) SOLENOID VALVE (Refill) FIG. 23 REFILL SOLENOID VALVE Location: The inlet solenoid valve is located inside the trunk on top of the flow control bracket. Test Procedure: 1. Disconnect the brewer from the power source. 2. Disconnect both wires from the solenoid valve coil terminals and check for continuity across the solenoid valve coil terminals. - Page 31 SERVICE (cont.) SOLENOID VALVE (Refill) (cont.) 9. Slide flow control bracket and solenoid as an assembly over flow control and secure with four #8-32 screws to the support bracket. 10. Securely fasten the water lines to and from the solenoid valve and flow control. 11.
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Page 32: Start Switch (Brew)
SERVICE (cont.) START SWITCH FIG. 25 START SWITCH Location: The start switch is located in front of hood to the left of the ON/OFF switch. Test Procedure: 1. Disconnect the brewer from the power source and remove the wires from both terminals of the switch. 2. -
Page 33: Tank Heater
SERVICE (cont.) TANK HEATER FIG. 27 TANK HEATER Location: The tank heater is located inside the hood on the right rear of the tank lid. Test Procedure: Electro/Mechanical Models. 1. Disconnect the brewer from the power supply. 2 With a voltmeter, check the voltage across the black and the red wire on the tank heater. -
Page 34: Timer (Early Models)
SERVICE (cont.) TIMER (ELECTRO/MECHANICAL ONLY)(EARLY MODELS) FIG. 29 TIMER Location: The timer is located inside the right front of the brewer on the upper part of the component bracket. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the wires from the timer terminals TL3, TL4 and TL5 and rotate the dial(s) fully counterclockwise. -
Page 35: Digital Timer (Late Models)
SERVICE (cont.) DIGITAL TIMER (ELECTRO/MECHANICAL ONLY) (LATE MODELS) FIG. 31 DIGITAL TIMER Location: The timer is located inside the front of the trunk on the top of the component bracket. Test Procedure. NOTE: Do not remove or install wires while timer board is installed. - Page 36 SERVICE (cont.) DIGITAL TIMER (ELECTRO/MECHANICAL ONLY) (LATE MODELS)(cont.) Timer Setting: NOTE: Prior to setting or modifying volumes, check that the brewer is connected to water supply, the tank is properly filled, and a funnel and server are in place. NOTE: All volume settings must be done with the sprayhead installed.
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Page 37: Warmer Element
SERVICE (cont.) WARMER ELEMENT FIG. 33 WARMER ELEMENT Location: The warmer element is located on the bottom the base (warmer) plate. Test Procedures: 1. Disconnect the brewer from the power source. 2. On 120/208V or 120/240V models, with a voltme- ter, check the voltage across the white wire and the white/violet wire or white/red wire to the ele- ment with the "ON/OFF (Warmer)"... -
Page 38: Wiring Diagrams
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