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Bunn H10X manual

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Table of contents for the manual

  • Page 1

    BU N N ® H10X 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 10889.0000C 7/00 ©1995 Bunn-O-Matic Corporation WARNING Very Hot Water Use With Care! ![...]

  • Page 2

    2 W ARRANTY 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 d[...]

  • Page 3

    3 USER NOTICES Carefully read and follow all notices on the equipment and in this manual. They were written for your protec- tion. All notices are to be kept in good condition. Replace any unreadable or damaged labels. 12593.0000 10044.0000 00656.0000 NOTICE ALL COMPONENTS ARE 200 TO 240 VOLT A.C. Replace only with components listed in the accompan[...]

  • Page 4

    4 ELECTRICAL REQUIREMENTS CAUTION - The dispenser must be disconnected from the power sour ce until specified in Initial Set-Up. This dispenser requires 2-wire, grounded service rated 208 or 240 volts ac, 40 amp, single phase. ( Refer to the dispenser ’ s dataplate for exact voltage requirement.) Electrical Hook-Up CAUTION – Improper electrical[...]

  • Page 5

    5 INITIAL SET -UP CAUTION - The dispenser must be disconnected from the power sour ce throughout the initial set-up, except when specified in the instructions. 1. Connect the dispenser to the power sour ce and turn on the water supply . 2. The “ HEA TER ” LED will glow for approximately five seconds. During this time, the electronic cir cuitry [...]

  • Page 6

    6 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 T echnical Ser vice Department. • Inspection, testing, and repair of electrical equipment should be performed only by qu[...]

  • Page 7

    7 TROUBLESHOOTING (cont.) PROBLEM Automatic refill will not operate af- ter drawing hot water . Water flows into the tank continu- ously . (Dispenser disconnected from power sour ce). Water flows into the tank continu- ously (Dispenser connected to power sour ce). Water is cold. PROBABLE CAUSE 1. No water 2. Water strainer/flow control 3. Overflow [...]

  • Page 8

    8 TROUBLESHOOTING (cont.) PROBLEM Water is cold (cont.) Water boils continuously . PROBABLE CAUSE 3. T ank heater 4. T emperature control 5. Dr y plug pr otection 1. T emperature control 2. Lime build-up REMEDY Refer to Service - T ank heater for testing procedures. See page 19. Refer to Service - Electronic controls for testing procedures. See pag[...]

  • Page 9

    9 WARNING Very Hot Water Use With Care! ! WARNING Very Hot Water Use With Care! ! SERVICE This section provides procedures for testing and replacing various major components used in this dis- penser should service become necessar y . Refer to T roubleshooting for assistance in determining the cause of any problem. Component Access WARNING - Disconn[...]

  • Page 10

    10 SERVICE (cont.) Electronic Control Assembly T roubleshooting: Check these items first • Is circuit board popped out of bracket? • Is circuit board wet due to misaligned overflow tube? • Is water in overflow cup activating float switch? • Is overflow cup not making good contact with tank? • Is dispenser being operated with panels remove[...]

  • Page 11

    11 SERVICE (cont.) Electronic Controls (cont.) Liquid Level Control T est Pr ocedure 1. Disconnect the dispenser from the power sour ce. 2. Check the voltage across terminals 3 & 4 of the electronic control assembly with a voltmeter . Con- nect the dispenser to the power source. The indi- cation must be 200 to 240 volts ac for 200 to 240 volt m[...]

  • Page 12

    12 SERVICE (cont.) Electronic Controls (cont.) T emperatur e Control Flow Charts (cont.) Still Boiling ? Heater Light On While Boiling ? Retry Drain cup Retry Disconnect Blue Wire F rom Control Board Pin 7 No Ye s Ye s Ye s No No H10X THERMOST A T PROBLEM: Boils Excessively - Fills Cup Still Boiling ? Replace Steam Sensor Replace T riac Assembly Ch[...]

  • Page 13

    13 SERVICE (cont.) Electronic Controls (cont.) 11. Disconnect the dispenser from the power sour ce. If voltage was present as described, return the new triac assembly to Bunn-O-Matic for credit. The tem- perature control of the system is operating properly . If voltage was not present as described, reinstall your existing electronic control assembl[...]

  • Page 14

    14 T riac Assembly Removal and Replacement NOTE - Each triac installation requires the use of an approved silicone heat sink compound. Bunn-O-Matic recommends the use of Dow Corning 340 compound or equivalent. It can be pur chased direct from Bunn-O- Matic (P .N. M2522.1000) 1. Remove the existing triac assembly held in place with a 10-32 hex keps [...]

  • Page 15

    15 SERVICE (cont.) Limit Thermostat P1993 FIG. 5 LIMIT THERMOST A T T est Pr ocedure: 1. Disconnect the dispenser from the power sour ce. 2. There are two black wires on the limit thermostat terminals. One comes from the terminal block. The other goes directly to the tank heater terminal. Re- move the black wire at the limit thermostat coming from [...]

  • Page 16

    16 Location: The overflow protection switch is located within the side of the dispenser inside the copper overflow cup. For testing or removal of the overflow protection switch, access may also be needed by removing the two screws attaching the electronic control assembly to its mount- ing bracket. T est Pr ocedure: 1. Once voltage is verified at t[...]

  • Page 17

    17 Solenoid Valve Location: The solenoid valve is located within the side of the dis- penser on the right side near the bottom. T o test the solenoid valve, access will also be needed to the electronic control assembly . BUNN 90 psig max operating pressure Strainer/Flow Control # 22300.0750 (Repl. Flow Washer #20526.0750) (Repl. Screen #23721.0000)[...]

  • Page 18

    18 WHI/BLU to Electronic Contol #1 RED to T erminal Block RED to Electronic Control #5 P1779 FIG. 10 SOLENOID V AL VE WIRING 5. Lift out the solenoid valve. 6. Remove the two 10-32 slotted-head screws hold- ing the solenoid valve to its mounting bracket. 7. Securely install the new solenoid valve to its mount- ing bracket. The direction of flow arr[...]

  • Page 19

    19 SERVICE (cont.) T ank Heater Location: The tank heater is located in the tank lid. P1993 FIG. 11 T ANK HEA TER T est Pr ocedure: 1. Disconnect the dispenser from the power sour ce. 2. Check the voltage across the terminals of the tank heater with a voltmeter . Connect the dispenser to the power sour ce. The indication must be 200 to 240 volts ac[...]

  • Page 20

    20 WIRING DIAGRAM 10889 091599[...]