CWT -DV, CWT APS-DV, CWTF-DV, CWTF APS-DV
INTRODUCTION This equipment will brew a half-gallon batch of coffee into an awaiting dispenser. It can be easily configured for 120V 15 amp, 120/208V 20 amp or 120/240V 20 amp. The brewer has a hot water faucet for allied beverage use. It is only for indoor use on a sturdy counter or shelf. BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows: 1) All equipment other than as specified below: 2 years parts and 1 year labor.
#12364.
#00656.
Models CWTF-DV & CWTF-APS DV ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. Requirements for brewers without an attached cord set are as follows: 120V VERSION 120/208-240V VERSION Requires 2-wire, grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz. Requires 3-wire, grounded service rated 120/240 volts ac, 20 amp, single phase, 60 Hz.
PLUMBING REQUIREMENTS These brewers must be connected to a cold water system with operating pressure between 20 and 90 psi (138 and 620 kPa) 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 (620 kPa) to reduce it to 50 psi (345 kPa) . The water inlet fitting is 1⁄4" flare.
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 connect the brewer to the power source. 4. Place the "ON/OFF" switch in the "ON" (upper) position, and momentarily press and release the start switch.
ADJUSTING BREW VOLUMES (cont.) 2. Setting batch sizes. To set a batch volume, first check that the SET/LOCK switch is in the "SET" position on the circuit board. Press and hold the START or BREW switch until three distinct clicks are heard, and then release the switch. (Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory). View the level of the liquid being dispensed.
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.) 5. Timer Refer to Service - Timer for testing procedures. See page 26 and 27 6. Solenoid Valve Refer to Service - Solenoid Valve for testing procedures. See page 19 7. Water strainer/flow control (.222 GPM) (A) Direction of flow arrow must be pointing towards brewer. (B) Remove the strainer/flow control and check for obstructions. Clear or replace. Water is not hot 1.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Inconsistent beverage level in dispenser 1. Strainer/flow control (.222 GPM) (A) Direction of flow arrow must be pointing towards the brewer. (B) Remove the strainer/flow control and check for obstruction. Clear or replace. Consistently low beverage level in the dispenser 2. Syphon System The brewer must be level or slightly lower in front to syphon properly. 3.
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 clean spray-head must be used for proper extraction. 4. Funnel Loading 5. Water Temperature Dry coffee grounds remain in the funnel 1. Funnel Loading Brewer is making unusual noises 1.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Brewer is making unusual noises (cont.) 4. Tank Heater(s) Remove and clean lime off the tank heater(s). See page 20 Low beverage serving temperature (CWTF Only) 1. Warmer Refer to Service - Warmer element for testing procedures.
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SERVICE (cont.) CONTROL THERMOSTAT a) 120 volts ac for two wire 120 volt models. b) 120 volts ac for three wire 120/208 volt models or 120/240 volt models. 8. Disconnect the brewer from the power source. If voltage is present as described, reinstall the capillary tube into the tank to the line 4.5" above the bulb, the control thermostat is operating properly. If voltage is not present as described, replace the thermostat. FIG.
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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. SERVICE (cont.) SOLENOID VALVE 7. Disconnect the brewer from the power source.
SERVICE (cont.
SERVICE (cont.) TANK HEATERS FIG. 12 TANK HEATERS Location: The tank heaters are located inside the tank and secured to the tank lid. Test Procedures: With Voltage selector switch set to 120V: 1. Disconnect the brewer from the power supply. 2. With a voltmeter, check the tank heater voltage across the white wire from the terminal block and black wire from the tank heater. Connect the brewer to the power source. The indication must be 120V ac.
SERVICE (cont.) TANK HEATERS (cont.) 15. Reconnect the wires to the limit thermostat and tank heaters and control thermostat. See Limit Thermostat and Control Thermostat sections in this manual when reconnecting wires. 16. Install fill basin, secure with tank inlet fitting and gasket. Insert water supply line through grommet in fill basin. 17. Refer to Fig.13 when reconnecting the tank heater wires.
SERVICE (cont.
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.) VOLTAGE SELECTOR SWITCH - DV models only If continuity is not present as described, replace the voltage selector switch. Removal and Replacement: 1. Disconnect the brewer from the power source. 2. Disconnect the three wires from the selector switch. 3. Remove the switch mounting nut from the under side of component mounting bracket; remove switch from bracket. 4. Install new switch in component mounting bracket and secure with mounting nut. 5. Refer to FIG.
THERMAL FUSES Page 26
SERVICE (cont.) DIGITAL TIMER FIG.
SERVICE (cont.) DIGITAL BREW TIMER (cont.) To increase a brew volume, place the ON/OFF switch in the “ON” position, press and hold the START switch until three clicks are heard. Release the switch and press it again one or more times. (Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory.) Each time the switch is pressed, two seconds are added to the brew time period.
SERVICE (cont.) WARMER ELEMENT(S) b) 120 volts ac for three wire 120/208 volt and 120/ 240 volt models. 4. Disconnect the brewer from the power source. If voltage is present as described, proceed to #5. If voltage is not present as described, refer to Wiring Diagrams and check brewer wiring harness. 5. Check the continuity across the two terminals on the warmer element. If continuity is present as described, reconnect the wires on the warmer element.
SCHEMATIC WIRING DIAGRAM CT-DV, CTF-DV, CWT-DV & CWTF-DV L1 GRN N READY INDICATOR BLU HEATER SWITCH LIMIT THERMOSTAT BLK BLK BLK SW.
SCHEMATIC WIRING DIAGRAM CWT, CWTF - APS, TS, TC DV L1 GRN N READY INDICATOR BLU HEATER SWITCH BLK LIMIT THERMOSTAT BLK BLK SW.
