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Bunn CWTF-TS-MV manual

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Table of contents for the manual

  • 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 F AX: (217) 529-6644 28182.0000C 9/00 ©1997 Bunn-O-Matic Corporation BU N N ® CWTF-MV CWTF-APS-MV CWTF-TS-MV CWTF-TSR-MV[...]

  • Page 2

    Page 2 INTRODUCTION This equipment will brew a half-gallon batch of coffee into an awaiting dispenser. It can be easily configured for 120V 15 amp, 120V 20 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. WARRANTY Bunn-O-Matic Corp. (“Bunn?[...]

  • Page 3

    Page 3[...]

  • Page 4

    Page 4 ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. Requires 2-wire, grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz. Requires 2-wire, grounded service rated 120 volts ac, 20 amp, single phase, 60 Hz. ELECTRICAL HOOK-UP CAUTION – Improper electrical ins[...]

  • Page 5

    Page 5 1. Flush the water line and securely attach it to the tee. 2. Turn on the water supply. 3. Place an empty vessel beneath the faucet and lift the handle until water is dispensed. 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[...]

  • 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 a[...]

  • Page 7

    Page 7 28182 090100 2. Setting batch sizes. T o set a batch volume, first check that the SET/LOCK switch is in the "SET" position on the circuit board. Press and hold the ST ART 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 [...]

  • 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[...]

  • Page 9

    Page 9 TROUBLESHOOTING (cont.) PROBLEM Brew cycle will not start (cont.) Water is not hot PROBABLE CAUSE REMEDY 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 thermostat. Use only replacement part #29329.1000 3. Control Thermostat 4. Tank Heat[...]

  • Page 10

    Page 10 TROUBLESHOOTING (cont.) PROBLEM Inconsistent beverage level in dispenser Consistently low beverage level in the dispenser Spitting or excessive steaming PROBABLE CAUSE 1. Strainer/flow control (.222 GPM) 2. Syphon System 3. Lime Build-up CAUTION - Tank and tank compo- nents should be delimed regularly depending on local water condi- tions. [...]

  • Page 11

    Page 11 TROUBLESHOOTING (cont.) PROBLEM Spitting or excessive steaming (cont.) Dripping from sprayhead Water flows into tank continuously (ON/OFF Switch "ON") Water flows into tank continuously (ON/OFF Switch "OFF") Beverage overflows dispenser PROBABLE CAUSE 2. Control Thermostat 1. Syphon System 2. Lime Build-up CAUTION - Tank[...]

  • Page 12

    Page 12 TROUBLESHOOTING (cont.) PROBLEM Weak beverage Dry coffee grounds remain in the funnel Brewer is making unusal noises 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 ® paper filters must be used for proper extraction[...]

  • Page 13

    Page 13 TROUBLESHOOTING (cont.) PROBLEM Brewer is making unusal noises (cont.) Low beverage serving tempera- ture (CWTF Only) PROBABLE CAUSE 4. Tank Heater(s) 1. Warmer REMEDY Remove and clean lime off the tank heater(s). See page 21 Refer to Service - Warmer ele- ment for testing procedures. See page 29 28182 090100[...]

  • Page 14

    Page 14[...]

  • Page 15

    Page 15 SERVICE (cont.) CONTROL THERMOSTAT Location: The control thermostat is located inside the trunk on the upper left side of the component bracket. 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 thermo[...]

  • Page 16

    Page 16 SERVICE (cont.) FUSE HOLDER AND FUSE ASSEMBLY[...]

  • Page 17

    Page 17 LIMIT THERMOSTAT Location: The limit thermostat is located inside the rear of the hood on the center rear of the tank lid. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the blue and black wires from the limit thermostat. 3. With an ohmmeter, check for continuity across the limit thermostat terminals. If cont[...]

  • Page 18

    Page 18[...]

  • Page 19

    Page 19 Location: The solenoid valve is located inside the trunk on the lower center part of the component bracket. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect both wires from the solenoid valve. Connect the brewer to the power source. With the lower warmer "ON/OFF" switch in the "ON" (upper) p[...]

  • Page 20

    Page 20 SERVICE (cont.) START SWITCH[...]

  • Page 21

    Page 21 TANK HEATERS Location: The tank heaters are located inside the tank and secured to the tank lid. Test Procedures: 1. Disconnect the brewer from the power supply. 2. With a voltmeter, check the tank heater voltage across blue and white wires on 120 volt 15 amp version, black and white wires on 120 volt 20 amp version or black and blue wires [...]

  • Page 22

    Page 22 SERVICE (cont.) TANK HEATERS (cont.) 17. Refer to Fig.14 when reconnecting the tank heater wires. FIG. 14 TANK HEATER TERMINALS P1420 28182 021500[...]

  • Page 23

    Page 23 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 a voltmeter, check the voltage between the black wire removed from the[...]

  • Page 24

    Page 24 SERVICE (cont. TANK HEATER SWITCH (cont.) 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 and tank heaters. Refer to Limit Thermostat and Tank Heater sections in this manual when[...]

  • Page 25

    Page 25 THERMAL FUSES[...]

  • Page 26

    Page 26 P1136 SERVICE (cont.) FIG. 20 TIMER TERMINALS Location: The timer is located inside the front of the trunk on the upper right side of component bracket. Test Procedure. 1. Disconnect the brewer from the power source. 2. Disconnect the polarized, three pin connector from the brewer wiring harness and rotate the brew timer dial fully counterc[...]

  • Page 27

    Page 27 SERVICE (cont.) DIGITAL TIMER (Late Models) FIG. 21 DIGITAL TIMER[...]

  • Page 28

    Page 28 SERVICE (cont.) T o increase a brew volume, place the ON/OFF switch in the “ON” position, press and hold the ST ART switch until three clicks are heard. Release the switch and press it again one or more times. (Failure to re- lease the switch within two seconds after the third click causes the volume setting to be aborted and pre- vious[...]

  • Page 29

    Page 29 SERVICE (cont.) WARMER ELEMENT(S)(CWTF MODELS ONLY) Location: The warmer elements are located under the warmer plates. Test Procedures: 1. Disconnect the brewer from the power source. 2. With a voltmeter, check voltage across the white wire from the terminal block and the wire from the "ON/OFF" switch to the warmer element with th[...]

  • Page 30

    Page 30[...]

  • Page 31

    Page 31 SCHEMA TIC WIRING DIAGRAM FOR CWT -APS MV , CWTF-APS MV , CWTF-TS MV , CWTF-TSR MV 28182 090100[...]