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Bunn S L &S L F - page 1
SL & SL & SLF SLF 10304.0000E 11/99 © 1988 BUNN-O-MATIC CORPORATION BUNN-O-MA TIC CORPORA TION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 F AX: (217) 529-6644 B UNN ® OPERA TING & SERVICE MANUAL 1 0 0 4 3 . 0 0 0 0 D 3 / 9 7 © 1 9 8 8 B U N N - O - M A T IC C O R P O R A T IO N W H I B L U L IM IT T H ...
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Bunn S L &S L F - page 2
Page 2 CONTENTS Introduction ............................................................... 2 User Notices .............................................................. 3 Electrical Requirements ............................................. 4 Plumbing Requirements ............................................ 5 Initial Set-Up ..................... ...
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Bunn S L &S L F - page 3
Page 3 THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AS 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 limite ...
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Bunn S L &S L F - page 4
Page 4 ELECTRICAL REQUIREMENTS CAUTION - Do not connect the brewer to the power source until specified in Initial Set-Up. MODEL 15 has an attached cordset, and requires 2-wire grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz. MODEL 20 requires 2-wire, grounded service rated 120 volts ac, 20 amp, single phase, 60 Hz. Proceed as follo ...
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Bunn S L &S L F - page 5
Page 5 PLUMBING REQUIREMENTS This brewer must be connected to a cold water system with operating pressure greater than 10 psi from a 1/2” or larger supply line. A shut-off valve should be installed in the line before the brewer . Install a regulator in the line when pressure is greater than 90 psi to reduce it to 50 psi. The water inlet fitting i ...
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Bunn S L &S L F - page 6
Page 6 19. Press the hot water switch to dispense exactly 20 ounces of hot water and immediately start a brew cycle into an empty graduated vessel. 20. Measure the brew water volume: if it is more than the amount measured in #16, remove the rear panel, turn the needle valve slightly clockwise, and replace the rear panel. If it is less than the amou ...
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Bunn S L &S L F - page 7
Page 7 Problem Equipment will not operate. Brew cycle will not start. Probable Cause 1. No power or incorrect voltage 1. No water 2. Water Strainer 3. Water Level Switch and Overflow Safety Switch Remedy (A) Connect the brewer to the power sour ce. (B) Check the terminal block for the proper voltages. (C) Check cir cuit breaker/fuse. Check plumbing ...
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Bunn S L &S L F - page 8
Page 8 TROUBLESHOOTING (cont.) Problem Brew cycle will not start. (cont.) Water flows into fill basin continu- ously (On/Lower brew station warmer switch "OFF"). Water flows into fill basin continu- ously (On/Lower brew station warmer switch "ON"). Water is not hot. Decanter warmer is not hot. Probable Cause 4. On/Lower Brew Sta ...
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Bunn S L &S L F - page 9
Page 9 TROUBLESHOOTING (cont.) Problem Spitting or unusual steaming from sprayhead. Warmer plates too hot, solenoid coil smoking, or water in tank heats ex- cessively fast. Inconsistent beverage level in de- canter . Dripping from sprayhead. Probable Cause 1. Control Thermostat 2. Lime build-up CAUTION T ank and tank components should be delimed re ...
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Bunn S L &S L F - page 10
Page 10 TROUBLESHOOTING (cont.) Problem No hot water dispensed from faucet (SLF only) Probable Cause 1. Hot Water Switch 2. Hot Water Dispense V alve 3. Inlet Solenoid Valve (Faucet) Remedy Refer to Service - Hot Water Switch for testing procedures. See page 24. Refer to Service - Hot Water Dis- pense V alve for testing procedures. See page 19. Ref ...
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Bunn S L &S L F - page 11
Page 11 TROUBLESHOOTING (cont.) Problem Brewer is making unusual noises. Probable Cause 1. Solenoid Valve 2. Plumbing lines 3. Water supply Remedy The nut on top of the solenoid valve must be tight or it will vibrate dur - ing operation. Plumbing lines should not rest on the counter top. (A) The brewer must be connected to a cold water line. (B) W ...
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Bunn S L &S L F - page 12
Page 12 FIG. 1 ACCESS P ANELS SERVICE This section provides procedures for testing and replacing various major components used in this brewer should service become necessar y . Refer to T roubleshooting for assistance in determining the cause of any problem. Component Access WARNING - Disconnect the br ewer from the power sour ce before the removal ...
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Bunn S L &S L F - page 13
Page 13 FIG. 2 CONTROL THERMOST A T SERVICE (cont.) Control Thermostat Location: The control thermostat is located inside the front access panel, FIG. 2. T o test the control thermostat, access will also be needed to the tank heater located in the bottom of the tank assembly . T est Procedure: 1. Disconnect the brewer from the power sour ce. 2. Wit ...
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Bunn S L &S L F - page 14
Page 14 FIG. 4 WARMERS FIG. 5 WARMER WIRING SERVICE (cont.) Location: One of the warmers is beneath the brew funnel and the other is on the top lid, FIG. 4. T est Procedure: 1. Once the switch has been tested and switch fail- ure has been eliminated, proceed as follows. 2. Disconnect the brewer from the power source and remove the #4-40 screws atta ...
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Bunn S L &S L F - page 15
Page 15 FIG. 6 W ARMER SWITCHES FIG. 7 WARMER SWITCH WIRING SERVICE (cont.) Warmer Switch(es) If voltage is present as described the switch is oper - ating properly . If voltage is not present as described, replace the switch. Removal and Replacement: 1. Compress the clips inside the housing and gently push the switch through the opening. 2. Remove ...
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Bunn S L &S L F - page 16
Page 16 FIG. 8 ST ART SWITCH FIG. 9 ST ART SWITCH WIRING SERVICE (cont.) Start Switch Location: The start switch is located on the far right of the front switch panel , FIG 8. T est Procedure: 1. Disconnect the brewer from the power sour ce and remove the wires from both terminals of the start switch. 2. Check for continuity across the two terminal ...
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Bunn S L &S L F - page 17
Page 17 P2014 FIG. 10 LIMIT THERMOST A T FIG. 11 LIMIT THERMOST A T WIRING SERVICE (cont.) Limit Thermostat 2. Carefully slide the limit thermostat out from un- der the retaining clip. 3. Carefully slide the new limit thermostat into the retaining clip. 4. Refer to FIG. 11 when reconnecting the wires. Location: The limit thermostat is located on th ...
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Bunn S L &S L F - page 18
Page 18 FIG. 13 SOLENOID V AL VE WIRING SERVICE (cont.) Solenoid Valve(cont.) T est Procedure: 1. With a voltmeter check the voltage across the white and the white/red wires when the On/Lower brew station warmer switch is in the upper posi- tion and the start switch is pressed to the lower position and released. Connect the brewer to the power sour ...
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Bunn S L &S L F - page 19
Page 19 SERVICE (cont.) HOT WA TER DISPENSE V AL VE (OPTIONAL) ...
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Bunn S L &S L F - page 20
Page 20 SERVICE (cont.) INLET SOLENOID V AL VE (F AUCET - OPTIONAL) FIG. 16 INLET SOLENOID V AL VE (F AUCET) P2021 Location: The Inlet Solenoid Valve (faucet) is located inside the rear access panel, FIG. 16. T est Procedures: 1. With a voltmeter check the voltage across the white and the white/violet wires when the hot wa- ter dispense switch is p ...
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Bunn S L &S L F - page 21
Page 21 SERVICE (cont.) Relay FIG. 18 RELA Y P2015 Location: The relay is located inside the front access panel, near the top of the bracket, FIG. 18. T est Procedure: 1. Disconnect the brewer from the power sour ce. 2. Remove the brown/black wire from the “A” ter - minal and the white wire from the “B” terminal on the relay . 3 . Check for ...
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Bunn S L &S L F - page 22
Page 22 FIG. 20 T ANK HEA TER SERVICE (cont.) T ank Heater Removal and Replacement: 1. Disconnect the brewer from the power sour ce. 2. Remove the top cover or top warmer housing and the rear access panel. 3. Disconnect the wires to the tank heater . 4. Gently pull the thermostat bulb with grommet out of the tank lid. 5. Disconnect and remove the f ...
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Bunn S L &S L F - page 23
Page 23 SERVICE (cont.) Water Level and Over flow Safety Switch FIG. 22 WA TER LEVEL and OVERFLOW SAFETY SWITCHES P2016 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. 22. T est Procedure: 1. Disconnect the brewer from the power sour ce. 2 ...
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Bunn S L &S L F - page 24
Page 24 SERVICE (cont.) HOT WA TER SWITCH(optional) (Added November 1999) 1 0 0 4 3 . 0 0 0 0 D 3 / 9 7 © 1 9 8 8 B U N N - O - M A T I C C O R P O R A T I O N W H I B L U L I M I T T H E R M O S T A T S W . & T H E R M O S T A T T A N K H E A T E R N B L K L 1 B L K W H I P 1 P 3 P 2 P 1 , P 2 , & P 3 A R E P I N S O F A P O L A R I Z E D ...
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Bunn S L &S L F - page 25
Page 25 REPLACEMENT P ARTS 05099.0000 ......... Airvent T ube 01171.0001 ......... Check Valve 13229.0000 ......... Decal, Front End-Cap Switch 02769.0000 ......... Decal, Surfaces Ar e Hot 01188.0000 ......... Deliming Spring 12753.0001 ......... Dispense Valve 13210.0000 ......... Fill Basin Anti-Syphon T ube 05106.0000 ......... Float Switch 205 ...
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Bunn S L &S L F - page 26
Page 26 BLK SW4 WHI/VIO WHI/VIO WHI WHI OPTIONAL HOT WATER FAUCET SYSTEM 120 VOLTS AC 2 WIRE 120/240 VOLTS AC 3 WIRE SINGLE PHASE 10305.0000M 11/99 © 1989 BUNN-O-MATIC CORPORATION WHI BLK AUXILIARY OUTLET WHI/RED BLK "KEEP WARM" HEATER WHI BLK GREEN WHI SCHEMATIC WIRING DIAGRAM SL TANK HEATER L1 PROTECTION SW LEVEL SW VIO BREW STATION WA ...
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