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®
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
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WARRANTY Bunn-O-Matic Corp. (“Bunn”) warrants the equipment manufactured by it to be commercially free from defects in material and workmanship existing at the time of manufacture and appearing within one year from the date of installation. In addition: 1.) Bunn warrants electronic circuit and/or control boards to be commercially free from defects in material and workmanship for two years from the date of installation. 2.) Bunn warrants the compressor on refrigeration equipment to be commerciall
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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 27362 092900 Page 3
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ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. L2RED L2 RED 120V.A.C. WHITE 208 or 240V.A.C. 200 OR 240V.A.C. L1 BLACK NEUTRAL 120V.A.C. BLACK P2185 P1841 "A" & "B" models require 2-wire, Requires 3-wire, grounded ser- grounded service rated 200 volts ac vice rated 120/208 volts or 120/240 or 240 volts ac, 20 amp, single phase, volts ac, 20 amp, single phase, 60 50 Hz. Hz. Electrical Hook-Up CAUTION – Improper electrical
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INITIAL SET-UP 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" position. 2. Connect the brewer to t
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ADJUSTING BREW VOLUMES (cont.) To decrease a batch size. Press and release the START or BREW switch once for every two-second interval to be removed from the total brew time period; then immediately press and hold down the START or BREW switch until three clicks are heard. Release the switch. (Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory). Allow the brew cycle to finish in order to
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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 electronic components have 120 - 240 volt ac and low voltage dc potential on their terminals. Shorting of terminals or the
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TROUBLESHOOTING (cont.) Remedy Problem Probable Cause Brew cycle will not start (cont.) Refer to Service - ON/OFF switch for 3. ON/OFF switch testing procedures. See page 28 Refer to Service - Start switch for 4. Start switch testing procedures. See page 32 Refer to Service - Timer for testing 5. Timer procedures. See page 34 or 35 Refer to Service - Dispense valve for 6. Dispense Valve testing procedures. See page 21 Refer to Service - Digital brewer 7. Digital Brewer Control controls for test
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Automatic refill will not operate 6. Solenoid Valve Refer to Service - Solenoid valve for (cont.) testing procedures. See page 30 Refer to Service - Selector switch for Beverage level will not adjust (Selec- 1. Selector switch tor switch in any position) testing procedures. See page 16 Water flows into tank continuously 1. (A) Level control board and level Refer to Service - Level control board (ON/OFF Switch "OFF") probe (Electro/mechanical)
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TROUBLESHOOTING (cont.) Remedy Probable Cause Problem Water from tank is not hot (cont.) 5. Triac assembly (DBC) Refer to Service - Digital brewer con- trol for testing procedures. See page 22 Server warmer is not hot. 1. ON/OFF switch Refer to Service - ON/OFF switch for testing procedures. See page 28 2. Warmer element Refer to Service - Warmer element for testing procedures. See page 37 Spitting or unusual steaming from 1. (A) Control thermostat (Electro/ Refer to Service - Control thermo- sp
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Inconsistent beverage level in server. 3. Dispense valve Refer to Service - Dispense valve for (cont.) testing procedures. See page 21 Consistently high or low beverage 1. (A) Time adjustment (Electro/ Refer to Service - Brew Timer for level in server. mechanical) testing and adjustment procedures. See pages 34 or 35 (B) DBC volume adjustment Refer to Service - Digital brewer control for testing procedures. See page 23 step 8 Dripping from
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy B.O.M. sprayhead #01082.0002 3. Sprayhead Weak beverage (cont.) should be used to properly wet the bed of ground coffee in the funnel. ® 4. Funnel loading The BUNN paper filter should be centered in the funnel and the bed of ground coffee leveled by gentle shak- ing. 5. Water temperature Empty the server, remove its cover, and place the server on the warmer. Place empty funnel over the server entrance, with ON/OFF switch in the "ON" (upper) p
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TROUBLESHOOTING (cont.) Probable Cause Remedy Problem Cannot access the DBC 1. Digital brewer control Refer to Service - Digital brewer con- trol for testing procedures. See page 22 step 7 DBC display is blank 1. Digital brewer control Refer to Service - Digital brewer con- trol for testing procedures. See page 23 step 9 27362 092900 Page 13
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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. The brewer should be unplugged when servicing, except when electrical tests are re- quired and the test procedure specifically states to plug in th
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SERVICE (cont.) 4. Disconnect the white/green wire and white/violet BYPASS VALVE wire. Check for continuity across the bypass valve coil terminals. If continuity is present as described, reconnect the white/green and white/violet wires to the bypass valve and proceed to #5. If continuity is not present as described, replace the bypass valve. 5. Check the bypass valve for coil action. Connect brewer to the power source. With the "ON/OFF (Warmer)" switch in the "ON" (upper)position press the star
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5. Reattach the connector to the brew timer circuit SERVICE (cont.) board or DBC connector. BREW SELECTOR SWITCH Grinder Interface: 6. Disconnect pink, gray and tan wires on the selector switch from the pink, gray and tan wires on the interface socket. 7. Check for continuity across the pink wire and the tan wire on the selector switch when the switch is in the 1 gallon position. Continuity must not be present in any other position. 8. Check for continuity across the pink wire and gray wire on t
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SERVICE (cont.) BREW SELECTOR SWITCH (cont.) 8. Reattach the connector to the brew timer circuit 7. Install the knob so that the arrow lines up in the 2 board or DBC gallon position when the switch is turned to the full 9. Refer to Fig. 5 when reconnecting the wires. right position. WHI/VIO to By-Pass Valve To Timer (Electro/mechanical Models) WHI/RED to Dispense Valve TAN GRY to GRY Lead on Interface GRY Socket PNK PNK to PNK Lead on Interface Socket TAN to TAN Lead on Interface Socket ELECTRO/
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SERVICE (cont.) b.) 200 to 240 volts ac for two wire 200 or 240 volt models. CONTACTOR ASSEMBLY (ELECTRO/MECHANICAL 5. Disconnect the brewer from the power source. ONLY) If voltage is present as described, proceed to #6. If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring har- ness. 6. Check for continuity between the two black wires of the contactor coil. If continuity is present as described, reconnect one black wire to the white wire or red wire fr
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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. Refer to Fig. 7 when reconnecting the wires. RED L1 to Terminal Block (Red Insert) BLK T2 to Tank Heater BLK L2 to Limit Ther- mostat RED T1 to Tank Heater BLK to WHI Lead from the Three Pole 120/208V or 120/ 240V Terminal Bloc
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SERVICE (cont.) b.) 200 to 240 volts ac for two wire 200 or 240 volt models. CONTROL THERMOSTAT (ELECTRO/MECHANICAL Voltage must not be indicated across these termi- ONLY) nals when the thermostat is turned "OFF" (fully counterclockwise). 6. Disconnect the brewer from the power source. If voltage is present as described, reinstall the capillary tube into the tank to the line 7" above the bulb, the control thermostat is operating properly. If voltage is not present as described, replace the therm
