H10X/H5X H5E/DV PC H5 ELEMENT With Digital Control Board 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.
WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel. Disconnect the dispenser fromthe power source when servicing, except when electrical tests are required and the test procedure specifically states to connect the dispenser to the power source. CONTENTS TroubleShooting............................................................................................4 Component Access ............................................................
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 Equipment will not operate (cont.) 2. Safety overflow switch Refer to Service – safety overflow switch for testing procedures. Automatic refill will not operate after drawing hot water. 1. No water Check plumbing and shut-off valves. 2. Water strainer/flow control (A) Direction of flow arrow must be pointing towards dispenser. (B) Remove the strainer/flow control and check for obstructions. Clear or replace. 3.
TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Water boils continuously. 1. Temperature control Refer to Service – electronic controls for testing procedures. 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 WARNING – Disconnect the dispenser from the power source before the removal of any panel or the replacement of any component. WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel. Disconnect the dispenser fromthe power source when servicing, except when electrical tests are required and the test procedure specifically states to connect the dispenser to the power source.
SERVICE Liquid Level Control Flow Charts Electronic Controls H5E, H5X LIQUID LEVEL CONTROL PROBLEM: Does Not Refill Overflow Cup Full ? Yes Remove Power Drain cup No Retry Disconnect Level Probe Voltage present at Solenoid Valve ? Yes Does Water Flow ? No H5 Yes Replace Probe No Unplug Ready Lamp Replace Solenoid Valve P4093.35 FIG.
SERVICE (cont.) Electronic Controls (cont.) Liquid Level Control Test Procedure 1. Disconnect the dispenser from the power source. 2. Check the voltage across terminals 3 & 4 of the electronic control board with a voltmeter. Connect the dispenser to the power source. The indication must be: a.) 100 to 120 volts ac for 100 to 120 volt models or b.) 200 to 240 volts ac for 200 to 240 volt models or c.) 230 volts ac for 230 volt models. 3. Disconnect the dispenser from the power source.
Electronic Controls (cont.) 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. Keep the exposed ends of the probe away from any metal surface of the dispenser. 9. 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.
SERVICE (cont.) Electronic Controls (cont.) If voltage was present as described, the temperature control of the system is operating properly. If voltage was not present as described, contact Bunn-O-Matic to order an electronic control board and temperature sensor for evaluation and proceed to #9. 6. Replace the electronic control board. 7. Check the voltage across the tank heater terminals with a voltmeter. Connect the dispenser to the power source. The indication must be: a.
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 dispenser. 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. Safety Overflow Switch H5 P4093 FIG.
SERVICE (cont.) Solenoid Valve (Late Models) Location: The solenoid valve is located inside the rear of the dispenser on the right side near the bottom. To test the solenoid valve, access will also be needed to the electronic control board. Fil ! l the wa ter to rm os tan po tat k Us we r or be for so co e cir on ly ur nn e tur cu on ce ec tin nin g El it ca a . g ap -o ec tric pa blepr op pli n Fo an of er ly llo all y ce Do w na gro the pro tec rat no tio un t us na d the ed loated e ne l/lo ch d.
SERVICE (cont.) Solenoid Valve (Early Models) Location: The solenoid valve is located behind the large access panel on the left side of the dispenser. To test the solenoid valve, access will also be needed to the electronic control board. If continuity is present as described, reconnect the wires and proceed to #7. If continuity is not present as described, replace the solenoid valve coil. 7. Check the solenoid valve for coil action. Connect the dispenser to the power source.
SERVICE (cont.) Tank Heater Location: The tank heater is located in the tank lid. 4. Remove the tank heater from the tank lid and inspect it for cracks in the sheath. If the sheath shows no sign of damage, proceed to #5. If the sheath is damaged, replace the tank heater. 5. Check for continuity across the tank heater terminals. H5 P4093 FIG. 16a TANK HEATER If continuity is present as described, reinstall the tank heater. The tank heater is operating properly.
SERVICE (cont.) Steam Sensor (Thermistor) Location: The thermistor is located on the end of the overflow tube above the overflow cup. To test the thermistor, access will also be needed to the electronic control board. Removal and Replacement: 1. Disconnect the dispenser from the power source. 2. Disconnect the thermistor from J5 on control board. 3. Loosen the set screw and the two screws securing the two half blocks together. Remove thermistor assembly from overflow tube. 4.
SERVICE (cont.) Dispense Valve (PC Only) Location: The Dispense Valve is located behind control panel. Bracket Shroud Dispense valve If voltage is not present as described, refer to Wiring Diagrams and check the dispenser wiring harness. Also check the control board for proper operation. Removal and Replacement: 1. Disconnect the dispenser from the power source and allow to cool. 2. Drain enough water from the tank so the water level is below the outlet. 3. Remove the nut and flare nut from the valve. 4.
L1 N L2 GRN SCHEMATIC WIRING DIAGRAM H5E-DV PC RED-14 BLK-14 Earth Ground MASTER ON/OFF SWITCH Chassis Ground RED-14 BLK-18 SELECTOR SWITCH BLU-14 LIMIT THERMOSTAT BLK-14 BLK-14 BRN-14 WHI/VIO-14 BLK-18 WHI/BLU-18 4 3 WHI-18 2 J7 1 VIO-18 COM CONTROL TANK HEATER WHT-14 120VAC SOL 120VAC SOL REFILL WHT-18 WHT-18 DISPENSE 5 4 3 2 1 N.O. MAIN 4000 W 1800 W N.C. OVERFLOW PROTECTION SWITCH RELAY PINK-22 J6-1 GRN-18 BOARD + 0-3.3VDC J4-1 + 0-3.
L1 GRN Earth Ground Chassis Ground SCHEMATIC WIRING DIAGRAM H5E-PC L2 RED-14 BLK-14 EMI FILTER BLK-18 RED-14 LIMIT THERMOSTAT BLK-14 BLK-14 TANK HEATER BLU-14 4000 W BLU-14 N.C. OVERFLOW PROTECTION SWITCH BLK-18 3 RED-18 2 J7 1 VIO-18 COM MAIN CONTROL RED-18 DISPENSE 230VAC SOL RED-18 5 4 3 2 1 N.O. RELAY PINK-22 J6-1 GRN-18 BOARD + 0-3.3VDC J4-1 + 0-3.
SCHEMATIC WIRING DIAGRAM H10X L1 GRN L2 or N Earth Ground MAIN ON/OFF SWITCH (Late Models only) Chassis Ground BLK-18 WHI/VIO-14 BLK-14 BLK-14 TRIAC LIMIT THERMOSTAT BLK-14 BLK-14 WHI/VIO-14 BLU-14 TANK HEATER TRIAC LIMIT THERMOSTAT BLK-14 BLK-14 RED or WHI-18 BLU-14 TANK HEATER OVERFLOW PROTECTION SWITCH RED RED BLK-18 4 3 2 1 J7 BLU-20 TAN-20 BLU-20 BLU-18 BRN/BLK-18 TAN-20 N.O.
SCHEMATIC WIRING DIAGRAM H5E/H5X L1 GRN L2 or N Earth Ground MAIN ON/OFF SWITCH (Late Models only) Chassis Ground BLK-18 LIMIT THERMOSTAT BLK-14 BLK-14 RED or WHI-18 BLK-14 BLU-14 TANK HEATER OVERFLOW PROTECTION SWITCH RED RED BLK-18 BLU-20 3 2 1 J7 WHI/VIO-14 BLU-18 4 N.O. COM MAIN CONTROL PINK-22 5 4 3 2 1 RELAY RED-18 or WHI-18 RED-18 or WHI-18 GRN-18 WHI/BLU-18 J6-1 BOARD + 0-3.3VDC J4-1 + 0-3.
SCHEMATIC WIRING DIAGRAM H5XA, H5EA (CE) L1 GRN/YEL L2 Earth Ground Chassis Ground BLK-14 LIMIT THERMOSTAT BLK-14 BLK-14 LIMIT THERMOSTAT BLU-14 TANK HEATER RFI SUPPRESSION CAPACITOR RED-18 BLK-18 EMI FILTER BLK-18 OVERFLOW PROTECTION SWITCH RED RED 4 3 2 1 RED-18 BLK-18 BLU-14 J7 WHI/VIO-14 MAIN CONTROL BOARD PINK-22 5 4 3 2 1 N.O. COM RED-18 GRN-18 WHI/BLU-18 SOL RED-18 RELAY J6-1 J2 6 1 FACTORY 0-3.3VDC 0-3.
SCHEMATIC WIRING DIAGRAM H5 ELEMENT GRN or GRN/YEL L1 L2 or N Earth Ground TERMINAL BLOCK BLK Chassis Ground RED MASTER ON/OFF SWITCH BLK WHI/BLU BRN/BLK RED LIMIT THERMOSTAT TANK HEATER BLU BRN/WHI N.C. OVERFLOW PROTECTION SWITCH BLK 2 1 4 3 REFILL TAN SOL J2 4 3 2 1 WHI/RED BRN MAIN CONTROL BLK BOARD 1 5 N.O.
