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Bunn CRT5 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 10478.0000D 6/00 ©1996 Bunn-O-Matic Corporation B UN N ® CR T5 CR TF5[...]

  • Page 2

    Page 2 INTRODUCTION This equipment will automatically brew a half-gallon batch of coffee into an awaiting dispenser. The brewer may include a hot water faucet for allied beverage use. It is only for indoor use on a sturdy counter or shelf. W ARRANTY Bunn-O-Matic Corp. (“Bunn”) warrants the equipment manufactured by it to be commercially free fr[...]

  • 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. # 12364.0000 # 00656.0000 # 00658.0000 # 00831.0000 # 00833.0000 10478 022800[...]

  • Page 4

    Page 4 ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. Model 35 requires 3-wire, grounded service rated 120/208 or 120/240 volts ac, 20 amp, single phase, 60 Hz. Proceed as follows: Model 20 requires 2-wire, grounded service rated 120 volts ac, 20 amp, single phase, 60 Hz. P[...]

  • Page 5

    Page 5 MODELS W/OUT FAUCET Models CRT5, CRT5A & CRT5B 1. Remove the shipping cap from the bulkhead fitting on the rear of the brewer. 2. Attach the flare fitting from the short piece of tubing on the flow control (supplied) to the water inlet fitting at the rear of the brewer. 3. Flush the water line and securely attach it to the flare fitting [...]

  • 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. 4. Con[...]

  • Page 7

    Page 7 10478 061500 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 boar d. 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 the[...]

  • 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.) Brew cycle will not start (cont.) 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. (A) Limit Thermostat (B) Thermal Cut-Off (Brewers with Faucet) CAUTION - Do not eliminate or bypass limit thermostat or[...]

  • Page 10

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

  • Page 11

    Page 11 TROUBLESHOOTING (cont.) 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 2. Control Thermostat 1. Syphon System 2. Lime Build-up CAUTION - Tank and tank com- pone[...]

  • Page 12

    Page 12 TROUBLESHOOTING (cont.) Weak beverage Dry coffee grounds remain in the funnel Brewer is making unusal noises 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 10478 022800 PROBLEM PROBABLE CAUSE BUNN ® paper filters must be used for proper extr[...]

  • Page 13

    Page 13 TROUBLESHOOTING (cont.) Brewer is making unusal noises (cont.) Low beverage serving tempera- ture 4. Tank Heater 1. Warmer 2. ON/OFF Switch Remove and clean lime off the tank heater. See page 20 Refer to Service - Warmer element for testing procedures. See page 29 Refer to Service - ON/OFF Switch for testing procedures. See page 17 10478 06[...]

  • Page 14

    Page 14 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 electri- cal equipment should be performed only by qualified service pe[...]

  • Page 15

    Page 15 SERVICE (cont.) Test Procedures: 1. Disconnect the brewer from the power source. 2. Locate the blue wire on the control thermostat. 3. Check the voltage across the blue wire on the control thermostat and the white insert on two pole 120 volt terminal block or three pole 120/240 volt terminal blocks and the red insert on two wire 200 volt or[...]

  • Page 16

    Page 16 SERVICE (cont.) LIMIT THERMOSTAT Location: The limit thermostat is located inside the rear of the hood on 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. Check for continuity across the limit thermostat terminals with a ohmmeter. P1800 FIG. 4[...]

  • Page 17

    Page 17 Location: The ON/OFF switch(s) are located on the front of the hood. 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 w[...]

  • Page 18

    Page 18 SERVICE (cont.) SOLENOID VALVE 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 the white and black wires from the solenoid valve. With the "ON/OFF" switch in the "ON" upper position p[...]

  • Page 19

    Page 19 SERVICE (cont.) START SWITCH Location: On brewers w/out fresh light the start switch is located in the right front of the hood. On brewers w/fresh light the start switch is located on the right side of the hood. Test Procedure: 1. Disconnect the brewer from the power supply. 2. Disconnect the blue wire and the white/red wire from the switch[...]

  • Page 20

    Page 20 SERVICE (cont.) TANK HEATER Location: The tank heater is located inside the tank and secured to the tank lid. Test Procedures: 1. Disconnect the brewer from the power supply. 2. Check the voltage across the black and white wires on 120 volt models or the black and red wires for 120/240 volt models, 200 volt models and 240 volt models with a[...]

  • Page 21

    Page 21 SERVICE (cont.) TANK HEATER (Cont.) P1168.71 FIG. 13 TANK HEATER TERMINALS 10478 061500 13. Secure sprayhead tube to hood using a hex nut. 14. Install sprayhead. 15. Reconnect the wires to the limit thermostat, tank heater and control thermostat. See limit thermo- stat and control thermostat sections in this manual when reconnecting wires. [...]

  • 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" positionand with a voltme[...]

  • Page 23

    Page 23 SERVICE (cont.) TANK HEATER SWITCH (cont.) P1135.80 FIG. 15 TANK HEATER SWITCH TERMINALS 10478 061500 14. Reconnect the two black wires to the tank heater switch terminals. 15. Set tank assembly inside the hood on mounting brackets and secure with two #8-32 screws. 16. Reconnect the wires to the limit thermostat, tank heater and the control[...]

  • Page 24

    Page 24 Location: The thermal cut-off is located inside the hood connected to the tank heater. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the thermal cut-off from the tank heater and the black wire from the control thermostat. 3. Check for continuity across thermal cut-off termi- nals with an ohmmeter. THERMAL CU[...]

  • Page 25

    Page 25 SERVICE (cont.) TIMER (Early Models) 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 counterclockwise.[...]

  • Page 26

    Page 26 SERVICE (cont.) TIMER (cont.) P1136 FIG. 19 TIMER TERMINALS 10478 061500 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 bre[...]

  • Page 27

    Page 27 DIGITAL BREW TIMER (Late Models) P2186.45 FIG. 20 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 NOTE: Do not remove or install wires while timer board is installed. Pressure applied to one side may cause damage to the board. 1. Dis[...]

  • Page 28

    Page 28 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. T imer Setting: NOTE: Prior to setting or modifying vol[...]

  • Page 29

    Page 29 WARMER ELEMENT(S) Location: The warmer elements are located under the warmer plates. 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, yellow, white/violet, brown/black or violet wire to the "ON/OFF" switch. 3. With a voltmeter, check voltage acro[...]

  • Page 30

    10478 061500 Page 30[...]

  • Page 31

    10478 061500 Page 31[...]

  • Page 32

    10478 061500 Page 32[...]