C, CT, CTF, CWT, CWTF OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 www.bunnomatic.
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 three years from the date of installation. 2.
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.
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 20 requires 2-wire, grounded service rated 120 volts ac, 20 amp, single phase, 60 Hz. Proceed as follows: Model 35 requires 3-wire, grounded service rated 120/208 or 120/240 volts ac, 20 amp, single phase, 60 Hz.
PLUMBING REQUIREMENTS (cont.) MODELS W/OUT FAUCET MODELS W/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.
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. 2. 3. Insert an empty funnel into the funnel rails. Place an empty dispenser under the funnel. Place the heater switch at the rear of the brewer in the “OFF” lower position and connect the brewer to the power source. 4. Fill the tank with water as directed: 4A. Model C Pour three pitchers of tap water into the screened area on top of the brewer.
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. 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.
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 volt ac and low voltage dc potential on their terminals.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Brew cycle will not start (cont.) (CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB) 3. ON/OFF Switch Refer to Service - ON/OFF Switch for testing. See page 17 4. Start Switch Refer to Service - Start Switch for testing procedures. See page 20 5. Timer Refer to Service - Timer for testing procedures. See page 23 6. Solenoid Valve Refer to Service - Solenoid Valve for testing procedures. See page 19 7. Water strainer/flow control (.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Inconsistent beverage level in dispenser 1. Strainer/flow control (.222 GPM) (CT,CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB) (A) Direction of flow arrow must be pointing towards the brewer. 2. Syphon System The brewer must be level or slightly lower in front to syphon properly. 3. Lime Build-up CAUTION - Tank and tank components should be delimed regularly depending on local water conditions.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Spitting or excessive steaming (cont.) 2. Control Thermostat Refer to Service - Control Thermostat for testing procedures. See page 15 Dripping from sprayhead 1. Syphon System The brewer must be level or slightly lower in front to syphon properly. 2. Lime Build-up CAUTION - Tank and tank components should be delimed regularly depending on local water conditions.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Weak beverage 1. Filter Type BUNN® paper filters must be used for proper extraction. 2. Coffee Grind A fine or drip grind must be used for proper extraction. 3. Sprayhead A six-hole stainless steel sprayhead must be used for proper extraction. 4. Funnel Loading The BUNN® paper filter must be centered in the funnel and the bed of ground leveled by gentle shaking. 5.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Brewer is making unusal noises (cont.)(CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB) 4. Tank Heater Remove and clean lime off the tank heater. See page 20 Brewer is making unusal noises (C) 1. Tank Heater Remove and clean lime off the tank heater. See page 20 Low beverage serving temperature 1. Warmer Refer to Service - Warmer element for testing procedures.
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. PO WA IN UR TER ON LY S S E R IE C Y D EA R ® N WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.
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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) Page 16
SERVICE (cont.
SERVICE (cont.) ON/OFF SWITCH (cont.) Test Procedure: 1. Disconnect the brewer from the power source. 2. Viewing the switch from the back remove the white or red wire from the upper terminal and the black wire from the center terminal. 3. Check the voltage across the white wire or red wire and the black wire with a voltmeter. 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.
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SERVICE (cont.) BLU to BLU Lead from Timer P1 START SWITCH - CT & CWT WHI/RED to ON/OFF Switch P1133 TANK HEATER 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 switch when it is held in the lower position.
9 SERVICE (cont.) TANK HEATER (Cont.) 3. c) 200 to 230 volts ac for two wire 200 or 230 volt models. 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. 5. Disconnect the black wire and the white or red wire from the tank heater terminals. Check for continuity across the tank heater terminals.
5. SERVICE (cont.) TANK HEATER SWITCH Check for continuity between the black wire removed from the limit thermostat and the black insert on the terminal block. with the tank heater switch in the "ON" upper position. Continuity should not be present in the "OFF" lower position. If continuity is present as described, the tank heater switch is operating properly. If continuity is not present as described, replace the tank heater switch.
SERVICE (cont.) DIAL TIMER (Early Models) - CT & CWT 1 3 .5 4 N N U B 5 P1135 2 BLK to Terminal Block (Black Insert) Y D A E R ST ON WE /LO AR T R C A U T IO N : W A R M E R S A N D S U R F A C E S A R E H O T USE COPPER WIRE ONLY FOR POWER SUPPLY CONNECTIONS BLK to Limit Thermostat S IE R E S W C MINUTES BUNN-O-MATIC P/N 2235-120 VAC TANK HEATER SWITCH (cont.) switch indicator/guard bracket, hex facenut and plastic facenut. 15.
SERVICE (cont.) 3 DIAL TIMER (Early Models) (cont.) 4. 5. 2 1 3 .5 4 5 MINUTES BUNN-O-MATIC P/N 2235-120 VAC 6. 7. 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 two wire 200 volt or 230 volt models. Disconnect the brewer from the power source.
SERVICE (cont.) DIGITAL BREW TIMER (Late Models) 6. With a voltmeter, check the voltage across terminals TL1 and TL4 when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source. The indication must be 0 volts. If voltage is as described, proceed to #7. If voltage is not as described, disconnect the brewer from the power source and replace the timer. DIGITAL BREW TIMER 7.
SERVICE (cont.) DIGITAL BREW TIMER (Late Models)(cont.) 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 required) to the component mounting bracket. 6. Adjust the timer as described below.
SERVICE (cont.) WARMER ELEMENT(S) If continuity is present as described, reconnect the white or red and white/red, and brown/black or violet wires on the warmer element. If continuity is not present as described, replace the warmer element. Removal and Replacement: 1. Remove the three #4-40 screws securing the warmer assembly to the brewer. 2. Lift the warmer assembly from the brewer. 3. Disconnect the two wires from the warmer element terminals. 4.
SCHEMATIC WIRING DIAGRAM C, CT & CWT L1 READY BLU HEATER SWITCH BLK LIMIT THERMOSTAT BLK SW. & THERMOSTAT BLK BLU BLK N GRN (FAUCET OPTION ONLY) THERMAL FUSE BLK WHI (MODELS 15 & 20) TANK HEATER RED (MODEL 35) WHI WHI ON/OFF SWITCH L2 "KEEP WARM" HEATER WHI 3 BLK 2 1 WHI/RED WHI/RED WHI/ORA OPTIONAL AUTOMATIC BREW CIRCUIT START SWITCH OPTIONAL FRESH LIGHT SYSTEM GRY L.E.D.
SCHEMATIC WIRING DIAGRAM CWTB L1 BLU HEATER SWITCH BLK LIMIT THERMOSTAT BLK L2 GRN/YEL READY BLK SW. & THERMOSTAT (FAUCET OPTION ONLY) THERMAL FUSE BLK BLU BLK TANK HEATER RED ON/OFF SWITCH RED 3 BLK 2 1 WHI/RED WHI/RED RED LOWER WARMER OPTIONAL AUTOMATIC BREW CIRCUIT START SWITCH BLU WHI/RED P1 BLU/BLK P3 WHI/RED BLK P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR.
SCHEMATIC WIRING DIAGRAM CWTA L1 BLU HEATER SWITCH BLK LIMIT THERMOSTAT ON/OFF SWITCH BLK SW. & THERMOSTAT (FAUCET OPTION ONLY) THERMAL FUSE TANK HEATER BLK BLK BLU BLK L2 GRN/YEL READY RED WHI WHI "KEEP WARM" RED 3 BLK 2 1 WHI/RED WHI/RED RED LOWER WARMER OPTIONAL AUTOMATIC BREW CIRCUIT START SWITCH BLU WHI/RED P1 P3 WHI/RED SOL BLU/BLK BLK P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR.
SCHEMATIC WIRING DIAGRAM CWTF, CWTFB NO WARMER L1 READY INDICATOR BLU HEATER SWITCH LIMIT THERMOSTAT BLK BLK BLK SW. & THERMOSTAT BLK BLU N GRN (FAUCET OPTION ONLY) THERMAL FUSE TANK HEATER BLK WHI (MODELS 15 & 20) RED (MODEL 35) WHI ON/OFF SWITCH L2 WHI "KEEP WARM" HEATER WHI WHI/RED BLK WHI/ORA OPTIONAL AUTOMATIC BREW CIRCUIT START SWITCH OPTIONAL FRESH LIGHT SYSTEM GRY L.E.D.
SCHEMATIC WIRING DIAGRAM CWTFA NO WARMER L1 READY INDICATOR BLU BLK LIMIT THERMOSTAT BLK BLU HEATER SWITCH SW. & THERMOSTAT L2 GRN THERMAL FUSE BLK BLK TANK HEATER THERMAL FUSE RED RED BLK RED BLK WHI WHI ON/OFF SWITCH BLK "KEEP WARM" HEATER RED WHI/RED WHI/ORA OPTIONAL FRESH LIGHT SYSTEM GRY L.E.D. PNK BLK 4 INDICATOR 3 2 TIMER 1 OPTIONAL AUTOMATIC BREW CIRCUIT START SWITCH WHI/RED WHI/RED BLU P3 P1, P2, & P3 ARE PINS OF A POLARIZED THREE-PIN CONNECTOR.
