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®
BUNN
H10X
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
10889.0000C 7/00 ©1995 Bunn-O-Matic Corporation
! WARNING
Very Hot Water
Use With Care!
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WARRANTY 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 defects in material and workmanship for two years from the date of installation. 2.) Bunn warrants the compressor on refrigeration equipment to be commerciall
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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. 00656.0000 #00831.0000 10044.0000 NOTICE ALL COMPONENTS ARE 200 TO 240 VOLT A.C. Replace only with components listed in the accompaning literature rated for the same voltage 12537.0000 12593.0000 10889 072700 3
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ELECTRICAL REQUIREMENTS CAUTION - The dispenser must be disconnected from the power source 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 installation will damage electronic components. 1. An electrician must provide electrical service as specified. 2. Using a voltmeter, check the voltage and col
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INITIAL SET-UP CAUTION - The dispenser must be disconnected from the power source throughout the initial set-up, except when specified in the instructions. 1. Connect the dispenser to the power source and turn on the water supply. 2. The “HEATER” LED will glow for approximately five seconds. During this time, the electronic circuitry will check for a full tank of water. 3. If the tank is not full of water, the refill circuit will energize, indicated by the “REFILL” LED glowing. Water will auto
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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 person- nel. • All electronic components have 200-240 volt ac and low voltage dc potential on their terminals. Shorting of terminals or th
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Automatic refill will not operate af- 1. No water Check plumbing and shut-off valves. ter drawing hot water. (A) Direction of flow arrow must be 2. Water strainer/flow control pointing towards dispenser. (B) Remove the strainer/flow con- trol and check for obstructions. Clear or replace. Refer to Service - Overflow protec- 3. Overflow protection switch tion switch for testing procedures. See page 16. 4. Liquid level system Refer to Service -
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TROUBLESHOOTING (cont.) PROBABLE CAUSE REMEDY PROBLEM 3. Tank heater Refer to Service - Tank heater for Water is cold (cont.) testing procedures. See page 19. 4. Temperature control Refer to Service - Electronic controls for testing procedures. See page 12. Check connections to Interlock 5. Dry plug protection board and sheath of tank tempera- ture probe. Refer to Service - Electronic controls 1. Temperature control for testing procedures. See page 12. Water boils continuously. Inspect the tank
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SERVICE This section provides procedures for testing and replacing various major components used in this dis- penser should service become necessary. Refer to Troubleshooting for assistance in determining the cause of any problem. Component Access WARNING - Disconnect the dispenser from the power source before the removal of any panel or the replace- ment of any component. P878 The limit thermostat, liquid level probe, tank heater, and temperature sensor are located at the top of the dispenser.
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Hot Water Systems – Water Tank Will Fill Autom C ao tic ffa ell ey B W re hw en e rU sn –it F Is il C l To hn en W eca te te dr T To a n Pko In wer! Accordance With The Installation Instructions! Failure To Comply Voids Warranty! WARNING HAZARDOUS VOLTAGE DISCONNECT FROM B P E O FW OE RR E S RO EM UR OC VE ING! SERVICE (cont.) H10X LIQUID LEVEL CONTROL Electronic Control Assembly Troubleshooting: PROBLEM: Does Not Refill Check these items first Yes • Is circuit board popped out of bracket? Ov
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SERVICE (cont.) 9. Check the voltage across the terminals 1 & 4 of the electronic control assembly with a voltmeter. Con- Electronic Controls (cont.) nect the dispenser to the power source. The indi- cation must be 200 to 240 volts ac for 200 to 240 Liquid Level Control Test Procedure volt models after a delay of approximately 5 sec- onds. 1. Disconnect the dispenser from the power source. 10. Touch the screw head end of the probe to the dis- 2. Check the voltage across terminals 3 & 4 of the p
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SERVICE (cont.) If the indicator was on or blinking, the temperature Electronic Controls (cont.) sensor is operating properly, proceed to #7. If the indicator was off, check the sensor connection Temperature Control Flow Charts (cont.) on the electronic control circuit board and/or replace the temperature sensor and the electronic control as- sembly. H10X THERMOSTAT NOTE - Each temperature sensor is calibrated to an PROBLEM: Boils Excessively - Fills Cup electronic control assembly. Both compone
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SERVICE (cont.) 5. Install the new temperature sensor into the grom- met on the tank lid. Route the wires to the location Electronic Controls (cont.) of the new electronic control assembly. 6. Attach the temperature sensor, overflow tube tem- 11. Disconnect the dispenser from the power source. perature sensor, and indicator wires to the elec- tronic control assembly. If voltage was present as described, return the new 7. Fasten the new electronic control assembly to its triac assembly to Bunn-O-
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SERVICE (cont.) 3. Securely fasten the new triac assembly to the rear Electronic Controls (cont.) panel in the same relative position as the one re- moved. Bunn-O-matic recommends tightening the Triac Assembly Removal and Replacement nut to a torque setting of approximately 18 inch- pounds. NOTE - Each triac installation requires the use of an 4. Disconnect the other ends of the old triac assem- approved silicone heat sink compound. Bunn-O-Matic bly wires. recommends the use of Dow Corning 340 c
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SERVICE (cont.) If voltage was present as described, reconnect the black Limit Thermostat wire and proceed to #5. If voltage was not present as described, refer to the Limit Thermostat Wiring Diagrams and check the dispenser wiring har- Location: ness. The limit thermostats are located on the tank lid. To test the limit thermostats, access will also be needed 5. Check for continuity across the terminals of the to the terminal block located on the side of the dis- limit thermostat. penser. If co
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SERVICE (cont.) Overflow Protection Switch Removal and Replacement: 1. Disconnect the black wires from the overflow pro- tection switch. 2. Remove the nut beneath the copper overflow cup. 3. Remove the entire switch assembly from the cup. 4. Place the new switch assembly into the cup, wires first. Make sure that a gasket is in place around the threaded switch stem. NOTE - The magnets must be at the top of the float and there must be NO stainless steel washers installed for the overflow protectio
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Hot Water Systems – Water Tank Will Fill Automatically When Unit Is Connected To Power! Coffee Brewers – Fill The Water Tank In Accordance With The Installation Instructions! Failure To Comply Voids Warranty! WARNING HAZARDOUS VOLTAGE DISCONNECT FROM POWER SOURCE BEFORE REMOVING! SERVICE (cont.) If voltage was present as described, proceed to #5. Solenoid Valve If voltage was not present as described, refer to the Wiring Diagrams and check the dispenser wiring har- Location: ness. The solenoid v
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SERVICE (cont.) Solenoid Valve (cont.) 5. Lift out the solenoid valve. 6. Remove the two 10-32 slotted-head screws hold- WHI/BLU to Electronic ing the solenoid valve to its mounting bracket. Contol #1 7. Securely install the new solenoid valve to its mount- ing bracket. The direction of flow arrow must be RED to Terminal Block RED to Electronic Control #5 pointing towards the tank lid. 8. Attach the solenoid valve and mounting bracket to the component bracket. 9. Securely fasten the water lines
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SERVICE (cont.) If voltage is present as described, proceed to #4. Tank Heater If voltage is not present as described, replace the tank heater. Location: 4. Remove the tank heater from the tank lid and in- The tank heater is located in the tank lid. spect it for cracks in the sheath. If continuity is present as described, reinstall the tank heater. The tank heater is operating properly. If continuity is not present as described, replace the tank heater. Removal and Replacement: 1. Remove the wir
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WIRING DIAGRAM 10889 091599 20
