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®
BUNN
SL &
SL &
SLF
SLF
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
10304.0000E 11/99 © 1988 BUNN-O-MATIC CORPORATION
SCHEMATIC WIRING DIAGRAM S
L1 SW. & GREEN N
THERMOSTAT LIMIT
BLK BLU THERMOSTAT BLK 1425W WHI
TANK HEATER
WHI 50W WHI
"KEEP WARM" HEATER
WHI
BLK BLU/BLK P1 BLU/BLK 100W
W TA OR PM RE ER A R WHI P2 WHI
WHI
BLK BRN/BLK P3 BRN/BLK 100W AP P 1O , P LA 2R , & IZ P ED 3 A
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CONTENTS Introduction ............................................................... 2 User Notices .............................................................. 3 Electrical Requirements ............................................. 4 Plumbing Requirements ............................................ 5 Initial Set-Up.............................................................. 5 Operating Controls..................................................... 6 Cleaning................................
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WARRANTY (cont.) 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 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 eq
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USER NOTICES (cont.) 00656.0000 12744.0000 This equipment is to be installed to WARNING HOT comply with the Basic Plumbing Code of WATER the Building Officials and Code Administrators International, Inc. (BOCA) and the Food Service Sanitation Manual of the Food and Drug Administration (FDA). ELECTRICAL REQUIREMENTS CAUTION - Do not connect the brewer to the power source until specified in Initial Set-Up. L2 RED WHITE 120 V.A.C. WHITE 208 or 240 NEUTRAL 120V.A.C. Volts A.C. NEUTRAL L1 BLACK 120 V
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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 is 1/4" flare. NOTE - Bunn-O-Matic recommends 1/4" copper tubing for installations of less than 25 feet from the 1/2" or larger supply line. A tight coil of
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INITIAL SET-UP (cont.) 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 amount measured in #16, remove the rear panel, turn the needle valve slightly counter- clockwise, and replace the rear panel. 21. Repeat s
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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 electric components have 120 volt ac voltage on their terminals. Shorting of terminals or the application of external vol
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Brew cycle will not start. (cont.) 4. On/Lower Brew Station Warmer Refer to Service - On/Lower Brew Switch Station Warmer Switch for testing procedures. See page 15. Refer to Service - Start Switch for 5. Start Switch testing procedures. See page 16. Refer to Service - Relay for testing 6. Relay procedures. See page 21. 7. Solenoid Valve Refer to Service - Solenoid Valve for testing procedures. See page 17. Refer to Service - Solenoid Val
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Spitting or unusual steaming from 1. Control Thermostat Refer to Service - Control Thermo- sprayhead. stat for testing procedures. See page 13. 2. Lime build-up Inspect the tank assembly for exces- sive lime deposits. Delime as re- CAUTION quired. Tank and tank components should be delimed regularly depending on local water conditions. Excessive mineral build-up on stainless steel surfaces can initiate corrosive reac- tions resulting in se
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy No hot water dispensed from faucet 1. Hot Water Switch Refer to Service - Hot Water Switch (SLF only) for testing procedures. See page 24. 2. Hot Water Dispense Valve Refer to Service - Hot Water Dis- pense Valve for testing procedures. See page 19. 3. Inlet Solenoid Valve (Faucet) Refer to Service - Inlet Solenoid Valve (faucet) for testing proce- dures. See page 20. 1. Beverage left in decanter The brew cycle should be started Beverage
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Brewer is making unusual noises. 1. Solenoid Valve The nut on top of the solenoid valve must be tight or it will vibrate dur- ing operation. 2. Plumbing lines Plumbing lines should not rest on the counter top. 3. Water supply (A) The brewer must be connected to a cold water line. (B) Water pressure to the brewer must not be higher than 90 psi. In- stall a regulator if necessary to lower the working pressure to approxi- mately 50 psi. Page 11
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SERVICE (cont.) 4. With a voltmeter, check the voltage across the Control Thermostat black wire terminal of the control thermostat and the white wire on the tank heater when the control thermostat is turned "ON" (fully clockwise). Con- nect the brewer to the power source. The indica- tion must be as described in step 2. Voltage must not be indicated across these terminals when the thermostat is turned "OFF" (fully counterclock- wise). 5. Disconnect the brewer from the power source. If voltage
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SERVICE (cont.) If voltage is present as described the switch is oper- Warmer Switch(es) 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 the wires from the switch terminals. 3. Refer to FIG. 7 when reconnecting the wires. 4. Push the new switch firmly into the opening. Top Warmer P2012 WHI to Top FIG. 6 WARMER SWITCHES Warmer, WHI to On/Lower Swi
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SERVICE (cont.) If continuity is present as described, reconnect the Start Switch wires, the switch is operating properly. If continuity is not present as described, replace the 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 hous- ing. 4. Refer to FIG. 9 when reconnecting the wires.
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SERVICE (cont.) 2. Carefully slide the limit thermostat out from un- der the retaining clip. Limit Thermostat 3. Carefully slide the new limit thermostat into the retaining clip. 4. Refer to FIG. 11 when reconnecting the wires. BLU/BLK to Control Thermostat BLK to Tank Heater P1715 FIG. 10 LIMIT THERMOSTAT Location: P1984 The limit thermostat is located on the back of the FIG. 11 LIMIT THERMOSTAT WIRING tank assembly, FIG. 10. Solenoid Valve Test Procedure: 1. Disconnect the brewer from the powe
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SERVICE (cont.) Removal and Replacement: Solenoid Valve(cont.) 1. Disconnect the brewer from the power source. Test Procedure: 2. Turn off the water supply to the brewer. 3. Remove the front access panel to gain access. 1. With a voltmeter check the voltage across the white and the white/red wires when the On/Lower 4. Disconnect all wires from the solenoid valve. 5. Disconnect the water lines to and from the sole- brew station warmer switch is in the upper posi- noid valve. tion and the start sw
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SERVICE (cont.) If the sound is heard as described and water will not pass through the solenoid valve, there may be a block- INLET SOLENOID VALVE (FAUCET - OPTIONAL) age 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. Removal and Replacement: 1. Disconnect the brewer from the power source. 2. Turn off the water supply to the brewer.
