H5E H5X OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 To ensure you have the latest revision of the manual or to obtain the illustrated parts catalog, please visit the Bunn-O-Matic website, at www.bunn.com. This is absolutely FREE, and the quickest way to obtain the latest catalog and manual updates.
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. 2) Electronic circuit and/or control boards: parts and labor for 3 years. 3) Compressors on refrigeration equipment: 5 years parts and 1 year labor.
CONTENTS Introduction...................................................2 Warranty........................................................2 User Notices..................................................3 Electrical Requirements.................................4 Plumbing Requirements................................4 Initial Set-Up..................................................5 Draining the Dispenser...................................5 Cleaning.........................................................
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 120, 208, or 240 volts ac, 20 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. 2. 3. 4. 5. 6. An electrician must provide electrical service as specified.
Plumbing Hook-Up 1. Flush the water line and securely attach it to the flare fitting on the rear of the dispenser. 2. Turn-on the water supply. 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.
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 – 240 volt ac and low voltage dc potential on their terminals.
TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Automatic refill will not oper- 1. No water ate after drawing hot water. 2. Water strainer/flow control Check plumbing and shut-off valves. (A) Direction of flow arrow must be pointing towards dispenser. (B) Remove the strainer/flow control and check for obstructions. Clear or replace. 3. Safety overflow switch Refer to Service – safety overflow switch for testing procedures. See page 17. 4.
TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Water boils continuously. 1. Temperature control Refer to Service – electronic controls for testing procedures. See page 10. 2. Lime build-up Inspect the tank assembliy for excess lime deposits. Delime as required. CAUTION – Tanks and tank components should be delimed reglarly depending on local water conditions. Excessive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks.
SERVICE This section provides procedures for testing and replacing various major components used in this dispenser 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 replacement of any component. P1770 The limit thermostat, liquid level probe, tank heater, and temperature sensor are located at the top of the dispenser.
SERVICE (cont.) Electronic Controls .0000 FIG. 1 ELECTRONIC CONTROL P1772 P1773 FIG. 2 TRIAC Location: The electronic control assembly is located inside the rear of the dispenser. Access will also be needed to the temperature sensor, overflow tube temperature sensor, and liquid level probe located on the tank lid and to the triac assembly located beneath the tank. General: This system controls the liquid level and water temperature of the dispenser.
SERVICE (cont.) 5. Check the voltage across terminals 1 & 4 of the electronic control assembly with a voltmeter. Connect the dispenser to the power source. The indication must be: a.) 100 to 120 volts ac for 100 to 120 voltmodels or b.) 200 to 240 volts ac for 200 to 240 volt models or c.) 230 volts ac for 230 volt models after a delay of approximately 5 seconds. 6. Disconnect the dispenser from the power source. Electronic Controls (cont.) Liquid Level Control Test Procedure 1.
SERVICE (cont.) Electronic Controls (cont.) If voltage was present as described, reinstall the probe, the sensing function of the system is operating properly. If voltage was not present as described, check the pink probe wire and the green ground wire for continuity and/or replace the probe. 7. Reconnect the pink wire to terminal 5 of the electronic control assembly. 8. Loosen the compression fitting, remove the probe from the tank lid, and inspect it for mineral deposits. Replace it if necessary.
SERVICE (cont.) Electronic Controls (cont.) If the indicator was on or blinking, the temperature sensor is operating properly, proceed to #7. If the indicator was off, check the sensor connection on the electronic control circuit board and/or replace the temperature sensor and the electronic control assembly. NOTE - Each temperature sensor is calibrated to an electronic control assembly. Both components MUST be replaced as a set. 7. Check the voltage across the tank heater terminals with a voltmeter.
SERVICE (cont.) 8. Reconnect the wires. 9. Review the initial set-up procedures. Electronic Controls (cont.) Electronic Controls Removal and Replacement Triac Assembly Removal and Replacement NOTE - Each electronic control assembly is calibrated to a temperature sensor probe. Both components MUST be replaced as a set. 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.
SERVICE (cont.) 4A. TO INCREASE THE TEMPERATURE Turn the adjustment screw in a clockwise direction with a small screwdriver. Allow the temperature to stabilize as described in step 2 and repeat step 3. Continue until the desired water temperature is achieved. Electronic Controls (cont.) Adjustments The H5X dispenser holds the water temperature at the threshhold of boiling. It is not adjustable by the user. The H5E dispenser is factory calibrated for the temperature specified on the data plate.
SERVICE (cont.) Limit Thermostat Location: The limit thermostat is located on the tank lid. To test the limit thermostat, access will also be needed to the terminal block located at the rear of the dis- If voltage was present as described, reconnect the black wire and proceed to #5. If voltage was not present as described, refer to the Wiring Diagrams and check the dispenser wiring harness. 5. Check for continuity across the terminals of the limit thermostat.
SERVICE (cont.) Removal and Replacement: 1. Disconnect the black wires from the safety overflow 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.
SERVICE (cont.) 7. Check the solenoid valve for coil action. Connect the dispenser to the power source. Listen carefully in the vicinity of the solenoid valve for a “clicking” sound after approximately 5 seconds, as the coil magnet attracts the plunger. 8. Disconnect the dispenser from the power source. 9. Reconnect the pink wire to terminal 5 of the electronic control assembly. Solenoid Valve Location: The solenoid valve is located inside the rear of the dispenser on the right side near the bottom.
SERVICE (cont.) Tank Heater Location: The tank heater is located in the tank lid. Removal and Replacement: 1. Remove the wires to the tank heater. 2. Remove the 8-32 nuts from the tank heater flange. 3. Remove the tank heater. 4. Inspect the tank heater gasket and replace if necessary. 5. Securely install the new tank heater. Be certain of a watertight seal. 6. Reconnect the wires, FIG. 13. P1772 FIG. 12 TANK HEATER Test Procedure: 1. Disconnect the dispenser from the power source. 2.
WIRING DIAGRAMS 20 10420 121598
WIRING DIAGRAMS 21 10420 121598
WIRING DIAGRAMS 22 10420 091902
