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Bunn C - page 1
OPERA TING & SER VICE MANU AL B UNN-O-MA TIC CORPORA TION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 www .bunnomatic.com C, CT , CTF , CWT , CWTF ...
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Bunn C - page 2
Page 2 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 fr ...
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Bunn C - page 3
Page 3 USER NOTICES Carefully read and follow all notices in this manual and on the equipment. All labels on the equipment should be kept in good condition. Replace any unreadable or damaged labels. 10841 071000 ...
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Bunn C - page 4
Page 4 ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from 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 35 requires 3-wire, grounded service rated 120/208 or 120/240 volts ac, 20 amp, single phase, 6 ...
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Bunn C - page 5
Page 5 MODELS W/OUT FAUCET Models CT, CWT, CTF & CWTF 1. Flush the water line and securely attach it to the flare fitting on the strainer or tee. 2. Turn on the water supply. 3. On CTF and CWTF Models, place an empty vessel beneath the faucet and lift the handle until water is dispensed. PLUMBING REQUIREMENTS (cont.) MODELS W/FAUCET 10841 07100 ...
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Bunn C - page 6
Page 6 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. Insert an empty funnel into the funnel rails. 2. Place an empty dispenser under the funnel. 3. Place the heater switch at the rear of the brewer in the “OFF” lower position and conne ...
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Bunn C - page 7
Page 7 the switch is pressed, two seconds are added to the brew time period. Allow the brew cycle to finish in order to verify that the desired volume has been achieved. T o decrease a batch size. Press and release the ST ART or BREW switch once for every two-second inter val to be removed from the total brew time period; then immediately press and ...
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Bunn C - page 8
Page 8 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 ...
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Bunn C - page 9
Page 9 TROUBLESHOOTING (cont.) PROBLEM Brew cycle will not start (cont.) (CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB) Water is not hot PROBABLE CAUSE REMEDY 3. ON/OFF Switch 4. Start Switch 5. Timer 6. Solenoid Valve 7. Water strainer/flow control (.222 GPM) 1. Tank Heater Switch 2. Limit Thermostat CAUTION - Do not eliminate or bypass limit ...
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Bunn C - page 10
Page 10 TROUBLESHOOTING (cont.) PROBLEM Inconsistent beverage level in dispenser Consistently low beverage level in the dispenser (CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB) Spitting or excessive steaming PROBABLE CAUSE 1. Strainer/flow control (.222 GPM) (CT,CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB) 2. Syphon System 3. Lime Build-up C ...
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Bunn C - page 11
Page 11 TROUBLESHOOTING (cont.) PROBLEM Spitting or excessive steaming (cont.) Dripping from sprayhead Water flows into tank continu- ously (ON/OFF Switch "ON") Water flows into tank continu- ously (ON/OFF Switch "OFF") Beverage overflows dispenser PROBABLE CAUSE 2. Control Thermostat 1. Syphon System 2. Lime Build-up CAUTION - ...
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Bunn C - page 12
Page 12 TROUBLESHOOTING (cont.) PROBLEM Weak beverage Dry coffee grounds remain in the funnel Brewer is making unusal noises (CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB) PROBABLE CAUSE 1. Filter Type 2. Coffee Grind 3. Sprayhead 4. Funnel Loading 5. Water Temperature 1. Funnel Loading 1. Solenoid 2. Plumbing Lines 3. Water Supply REMEDY BUNN ...
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Bunn C - page 13
Page 13 TROUBLESHOOTING (cont.) PROBLEM Brewer is making unusal noises (cont.)(CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB) Brewer is making unusal noises (C) Low beverage serving tempera- ture PROBABLE CAUSE 4. Tank Heater 1. Tank Heater 1. Warmer REMEDY Remove and clean lime off the tank heater. See page 20 Remove and clean lime off the tan ...
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Bunn C - page 14
Page 14 MODEL CWT CA UT ION : W A R M E R S A N D S U R F A C E S A R E H O T C A U T IO N CAUTION DISCARD DECANTER DISCARD DECANTER IF: IF: . C R A C K E D . CRACKED . S C R A T C H E D . SCRATCHED . B O IL E D D R Y . BOILED DRY . H E A T E D W H E N E M P T Y . HEATED WHEN EMPTY . U S E D O N H I G H F L A M E . USED ON HIGH FLAME . O R E X P O ...
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Bunn C - page 15
Page 15 ...
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Bunn C - page 16
Page 16 BLU to BLU Wire from Limit Thermostat BLK to BLK Wire fromTank Heater (Brewers W/Out Faucet) BLK toThermal Cut-Off from Tank Heater (Brewers with Faucet) ...
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Bunn C - page 17
Page 17 C A U T IO N CAUTION D IS C A R D D E C A N T E R DISCARD DECANTER IF : IF: ! B U N N ® C SERIES R E A D Y LOWER POUR IN WATER ONLY C A U T IO N CAUTION D IS C A R D D E C A N T E R DISCARD DECANTER IF : IF: ! B U N N ® C SERIES R E A D Y LOWER POUR IN WATER ONLY C A U T IO N CAUTION D IS C A R D D E C A N T E R DISCARD DECANTER IF : IF: ...
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Bunn C - page 18
Page 18 Connect wire to Terminal #1 as follows: Lower Warmer ........................................................ WHI/RED One Top Warmer ............................................................. VIO Two Top Warmers (Front) .................................................................... BRN/BLK (Rear) ................................... ...
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Bunn C - page 19
Page 19 ...
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Bunn C - page 20
Page 20 SERVICE (cont.) START SWITCH - CT & CWT Location: The start switch is located in the center front of the hood. Test Procedure: 1. Disconnect the brewer from the power supply. 2. Disconnect the blue wire from the top switch terminal and the white/red from the bottom switch terminal. 3. Check for continuity across the two terminals on the ...
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Bunn C - page 21
Page 21 SERVICE (cont.) TANK HEATER (Cont.) c) 200 to 230 volts ac for two wire 200 or 230 volt models. 3. Disconnect the brewer from the power source. If voltage is present as described, proceed to #4 If voltage is not present as described, refer to the Wiring Diagrams and check wiring harness. 4. Disconnect the black wire and the white or red wir ...
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Bunn C - page 22
Page 22 SERVICE (cont.) TANK HEATER SWITCH Location: The tank heater switch is located on the rear of the brewer on the upper left side of the trunk. Test Procedure: 1. Disconnect the brewer from the power source. 2. Disconnect the black wire from the limit thermo- stat. 3. With the tank heater switch in the "ON" position check the voltag ...
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Bunn C - page 23
Page 23 SERVICE (cont.) TANK HEATER SWITCH (cont.) switch indicator/guard bracket, hex facenut and plastic facenut. 15. Reconnect the two black wires to the tank heater switch terminals. 16. Set tank assembly inside the hood on mounting brackets and secure with two #8-32 screws. 17. Reconnect the wires to the limit thermostat, tank heater and the c ...
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Bunn C - page 24
Page 24 SERVICE (cont.) DIAL TIMER (Early Models) (cont.) with a voltmeter when the "ON/OFF" switch is in the "ON" position (upper) and start switch pressed. Connect the brewer to the power source. The indication must be: a) 120 volts ac for two wire 120 volt models and three wire 120/240 volt models. b) 200 to 230 volts ac for ...
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Bunn C - page 25
Page 25 10841 071000 DIGITAL BREW TIMER (Late Models) P2203.45 DIGITAL BREW TIMER SERVICE (cont.) Location: The timer is located inside the front of the trunk on the upper right side of component bracket. Test Procedure (Digital Timer): NOTE: Do not remove or install wires while timer board is installed. Pressure applied to one side may cause damag ...
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Bunn C - page 26
Page 26 4. Attach all wires to the replacement timer board prior to installation to the component mounting bracket. Refer to FIG. 21 when reconnecting the wires. 5. Install new circuit board with spacers (as re- quired) to the component mounting bracket. 6. Adjust the timer as described below. Timer Setting (Digital): NOTE: Prior to setting or modi ...
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Bunn C - page 27
Page 27 SERVICE (cont.) WARMER ELEMENT(S) Location: The warmer element(s) is located under the warmer plate. Test Procedures: 1. Disconnect the brewer from the power source. 2. Use the white or red wire to the terminal block and the white/red, brown/black or violet wire to the "ON/OFF" switch. 3. Check voltage across the white or red and ...
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Bunn C - page 28
Page 28 P3 BLK P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR. BLU BLU/BLK WHI BREW TIMER P1 P2 WHI OPTIONAL AUTOMATIC BREW CIRCUIT SCHEMATIC WIRING DIAGRAM C, CT & CWT 10836.0000E 07/00 ©1995 BUNN-O-MATIC CORPORATION P2 P1 FRONT WHI WHI P3 WHI BRN/BLK VIO WHI REAR WHI WHI BLK WHI/RED LOWER WARMER START SWITCH WHI/RED WHI/RED L1 ...
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Bunn C - page 29
Page 29 P3 P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR. BLU P1 RED OPTIONAL AUTOMATIC BREW CIRCUIT SCHEMATIC WIRING DIAGRAM CWTB 10836.0002E 07/00 ©1995 BUNN-O-MATIC CORPORATION P2 P1 FRONT RED RED P3 RED BRN/BLK VIO RED REAR RED RED RED BLK WHI/RED LOWER WARMER START SWITCH WHI/RED WHI/RED L1 GRN/YEL BLK L2 HEATER SWITCH BLK BLU ...
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Bunn C - page 30
Page 30 P3 P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR. BLU P1 RED OPTIONAL AUTOMATIC BREW CIRCUIT SCHEMATIC WIRING DIAGRAM CWTA 10836.0003E 07/00 ©1995 BUNN-O-MATIC CORPORATION P2 P1 FRONT RED RED P3 RED BRN/BLK VIO RED REAR RED WHI RED RED BLK WHI/RED LOWER WARMER START SWITCH WHI/RED WHI/RED L1 GRN/YEL BLK L2 HEATER SWITCH BLK ...
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Bunn C - page 31
Page 31 P3 BLK P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR. WHI BLK SOL BLU BLU WHI BREW TIMER P1 P2 WHI OPTIONAL AUTOMATIC BREW CIRCUIT SCHEMATIC WIRING DIAGRAM CWTF, CWTFB NO WARMER WHI BLK START SWITCH WHI/RED WHI/RED TANK HEATER L1 GRN BLK RED (MODEL 35) WHI (MODELS 15 & 20) N L2 HEATER SWITCH BLK BLU READY INDICATOR BLU SW ...
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Bunn C - page 32
Page 32 10841 042401 READY INDICATOR BLK BLU SW. & THERMOSTAT P3 BLK P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR. WHI BLK SOL BLU BLU WHI BREW TIMER P1 P2 WHI OPTIONAL AUTOMATIC BREW CIRCUIT SCHEMATIC WIRING DIAGRAM CWTFA NO WARMER RED BLK WHI/RED WHI/RED TANK HEATER L1 GRN BLK RED L2 HEATER SWITCH BLK BLK BLU ON/OFF SWITCH WHI ...
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