BUNN ® CW-APS, CWT-TS & CWT-TSR OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 10690.
INTRODUCTION This equipment will brew a half-gallon batch of coffee into an awaiting dispenser. It can be easily configured for either pour-over or automatic brewing. The automatic version may include a hot water faucet for allied beverage use. It is only for indoor use on a sturdy counter or shelf. WARRANTY Bunn-O-Matic Corp.
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. #00831.0000 #00656.0000 #00658.
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. L2 RED WHITE WHITE NEUTRAL L1 BLACK 120V A.C. Model 20 requires 2wire, grounded service rated 120 volts ac, 20 amp, single phase, 60 Hz. Proceed as follows: WHITE 120V A.C. 208 OR 240V A.C. NEUTRAL L1 BLACK 120V A.C.
PLUMBING REQUIREMENTS (cont.) SECOND TYPE MODELS W/FAUCET EARLY MODELS W/OUT FAUCET 1. Flush the water line and securely attach it to the flare fitting on the strainer. 2. Turn on the water supply. THIRD TYPE MODELS W/FAUCET Models CWTF-APS, CWTF-TS CWTF-TSR: 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. 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.
ADJUSTING BREW VOLUMES CAUTION - Disconnect the power source from the brewer prior to the removal of any panel for the replacement or adjustment of any component. NOTE: Prior to setting or modifying batch sizes, check that the brewer is connected to water supply, the tank is properly filled, and a funnel and server are in place. 1. Modifying batch sizes. To modify a batch volume, first check that the SET/LOCK switch is in the “SET” position on the circuit board. To increase a batch size.
COFFEE BREWING 1. 2. 3. 4. 5. ® Insert a BUNN filter into the funnel. Pour the fresh coffee into the filter and level the bed of grounds by gently shaking. Slide the funnel into the funnel rails. Place an empty dispenser beneath the funnel. Operate the brewer as directed: 5A.Models CW-APS & CW-TS: Pour one pitcher of tap water into the screened area on top of the brewer. 5B.Models CWT-APS, CWTF-APS, CWT-TS, CWTF-TS, CWT-TSR & CWTF-TSR Place the "ON/OFF" switch in the "ON" (upper) position.
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.) (CWT-APS, CWTF-APS, CWT-TS, CWTF-TS, CWT-TSR &CWTFTSR) 3. ON/OFF Switch Refer to Service - ON/OFF Switch for testing. See page 18 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 25 or 27 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) (CWT-APS, CWTF-APS, CWT-TS, CWTF-TS, CWT-TSR & CWTF-TSR (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 16 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.)(CWT-APS, CWTF-APS, CWT-TS, CWTF-TS, CWT-TSR, CWTF-TSR) 4. Tank Heater Remove and clean lime off the tank heater. See page 21 Brewer is making unusal noises (CW) 1. Tank Heater Remove and clean lime off the tank heater.
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 electrical equipment should be performed only by qualified service personnel. The brewer should be unplugged when servicing, except when electrical tests are required and the test procedure specifically states to plug-in the brewer.
SERVICE (cont.) Test Procedures: 1. Disconnect the brewer from the power source. 2. Locate the blue wire on the control thermostat. 3. With a voltmeter, check the voltage across the blue wire on the control thermostat and the white insert on two pole 100 or 120 volt terminal block or three pole 120/240 volt terminal blocks and the red insert on two wire 200 volt or 240 volt terminal block. Connect the brewer to the power source.
LIMIT THERMOSTAT SERVICE (cont.) CONTROL THERMOSTAT (cont.) Removal and Replacement: 1. Remove wires from control thermostat leads. 2. Remove the thermostat capillary bulb by firmly pulling up on the capillary at the tank lid. This will disengage the grommet from the tank lid. 3. Early Models: Remove the two #8-32 screws securing control thermostat bracket mounted inside the hood. Late Models: Remove the one #8-32 screw securing the control thermostat to the component bracket in the trunk. 4.
SERVICE (cont.) ON/OFF SWITCH If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness. 5. With the black wire removed, remove the white/ red wire from the lower terminal. 6. Check for continuity across the center and lower terminal with the switch in the "ON" (upper) position. Continuity must not be present when the switch is in the "OFF" (lower) position. FIG.
SERVICE (cont.) If continuity is not present as described, replace the solenoid valve. SOLENOID VALVE 6. Check the solenoid valve for coil action. Connect the brewer to the power source. With "ON/OFF" switch in the "ON" (upper) position press start switch and listen carefully in the vicinity of the solenoid valve for a" clicking" sound as the coil magnet attracts. 7. Disconnect the brewer from the power source.
SERVICE (cont.) START SWITCH If continuity is present as described, reconnect the blue wire to the top terminal and the white/red wire to the bottom terminal. If continuity is not present as described, replace the switch. Removal and Replacement: 1. Remove the blue wire and white/red wire from the start switch. 2. Compress the clips inside the hood and gently push the switch through the opening. 3. Push new switch into the opening and spread the clips to hold the start switch in the hood. 4. Refer to Fig.
SERVICE (cont.) TANK HEATER 4. Disconnect the black wire and the white wire or red wire from the tank heater terminals. 5. Check for continuity across the tank heater terminals. If continuity is present as described, reconnect the wires, the tank heater is operating properly. If continuity is not present as described, replace the tank heater. NOTE- If the tank heater remains unable to heat, remove and inspect heater for cracks in the sheath. P1127.40 FIG.
SERVICE (cont.) TANK HEATER (Cont.) 10. Install new tank heater with gaskets on the tank lid and secure with two hex nuts. 11. Install tank lid with limit thermostat, sprayhead tube, tank heater, coil assembly (brewers with faucet) and control thermostat with bracket (early brewers only) using eight #8-32 hex nut. 12. Reconnect the inlet and outlet water lines to the faucet coil assembly. 13. Secure spayhead tube to hood using a hex nut. 14. Install sprayhead. 15.
SERVICE (cont.) TANK HEATER SWITCH If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness. 5. 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.
SERVICE (cont.) TANK HEATER SWITCH (cont.) 13. Remove the plastic facenut, hex facenut and the switch indicator/guard bracket that secures tank heater switch to the rear of the brewer. Remove switch and discard. 14. Insert new tank heater switch through the hole in the upper left rear of the trunk and secure with switch indicator/guard bracket, hex facenut and plastic facenut. 15. Reconnect the two black wires the tank heater switch terminals. 16.
SERVICE (cont.) TIMER(Early Models) If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness. P1127.40 FIG. 16 TIMER 5. With a voltmeter, check the voltage across the sockets P1 & P2 (blue and white wires) of the female connector when the "ON/OFF" switch is in the "ON" (upper) position and the "START" switch is pressed. Connect the brewer to the power source.
SERVICE (cont.) TIMER (cont.) If voltage is present as described, the brew timer is operating properly. Reset the timer dial as required, to obtain the desired brew volume. If voltage is not present as described, replace the timer. Removal and Replacement: 1. Separate all connectors between the brewer wiring harness and the timer. 2. Remove the one #8-32 screw securing timer to component bracket. 3 Install new timer circuit board as described in Late Model Timer section on the following pages. 4.
DIGITAL BREW TIMER (Late Models) 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 harness. 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.
SERVICE (cont.) DIGITAL BREW TIMER (Late Models)(cont.) Timer Setting: NOTE: Prior to setting or modifying volumes, check that the brewer is connected to water supply, the tank is properly filled, and a funnel and server are in place. NOTE: All volume settings must be done with the sprayhead installed. 1. Modifying brew volumes. To modify a brew volume, first check that the SET/LOCK switch is in the “SET” position on the circuit board.
Page 29 10690 081100
Page 30 10690 081100
Page 31 10690 081100
Page 32 10690 081100
Page 33 10690 081100
