H5E, H5X With Digital Control Board 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 Warranty........................................................2 Introduction...................................................3 User Notices..................................................3 Electrical Requirements.................................4 Plumbing Requirements................................5 Initial Set-Up..................................................5 Programming.................................................6 Draining the Dispenser...................................
ELECTRICAL REQUIREMENTS WARNING - The dispenser must be disconnected from the power source until specified in Initial Set-Up. Refer to Data Plate on the Brewer, and local/national electrical codes to determine circuit requirements.
PLUMBING REQUIREMENTS This dispenser must be connected to a cold water system with operating pressure between 20 and 90 psi (138 and 620 kPa)from a ⁄2” or larger supply line. A shut-off valve should be installed in the line before the dispenser. Install a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345 kPa). The water inlet fitting is ⁄4” flare.
PROGRAMMING When power is applied to the dispenser, the display located on the bottom of the main circuit board will show the revision level of the software for 5 seconds, and then go to (-). While the tank is filling, the display will read (FIL). When the tank is full the display will return to (-). LEFT BUTTON CENTER BUTTON RIGHT BUTTON P3747 INITIAL PROGRAMMING OF THE CONTROL BOARD 1. Before programming any settings into the Control Board, confirm the correct machine selection is entered. 2.
PROGRAMMING (Continued) LEVEL 2 PROGRAMMING FAHRENHEIT OR CENTIGRADE SELECTION, & RESTORING FACTORY DEFAULTS 1. To enter Level 2 Programming, press and hold the center button until H2 appears on the display (approximately 6 seconds). Release the center button, The display will show either FAH (Degrees in Fahrenheit) or CEn (Degrees in Centigrade). 2. Press and release the (+) or (-) buttons to alternate between FAH and CEn. 3.
DRAINING THE DISPENSER CAUTION - The dispenser must be disconnected from the power source throughout these steps. 1. 2. 3. 4. 5. Disconnect the dispenser from the power source. Shut-off and disconnect the incoming water supply Remove the 4-40 screws at the sides of the top panel. Gently remove one of the grommets from the tank lid. Insert a tube to the bottom of the tank and syphon ALL of the water out.
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. See page 18. 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. 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 H5E, H5X LIQUID LEVEL CONTROL PROBLEM: Overflows Drain cup Unplug Ready Lamp Retry Overflow ? No Replace Ready Lamp Yes Drain cup FIG. 1 ELECTRONIC CONTROL Disconnect Probe Wire From Probe Short Probe Wire To Chassis P1772 Retry Location: The electronic control board 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.
SERVICE (cont.) Electronic Controls (cont.) 4. Remove the pink wire from terminal 5 of the electronic control assembly. 5. Check the voltage across terminals 1 & 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 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.
SERVICE (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. 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.
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 BunnO-Matic to order an electronic control board and temperature sensor for evaluation and proceed to #9. 6. Replace the electronic control board. T5 PNK to Liquid Level Probe 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.
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 board. 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. FIG. 9 TANK HEATER 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. 10. BLU to Control Board Relay P4093 Test Procedure: 1.
L1 BLK GRN L2 RED SCHEMATIC WIRING DIAGRAM H5E BLK BLK LIMIT THERMOSTAT BLK WHI MAIN ON/OFF SWITCH (Late Models only) WHI/VIO BLU TANK HEATER BLK OVERFLOW PROTECTION SWITCH RED RED WHI/VIO BLK RELAY READY GRY PNK GRY PNK PNK GRY GRY PNK POWER REFILL HEATER MAIN CONTROL BOARD J3 J4 J1 5 4 3 2 1 PNK WHI GRN WHI/BLU SOL WHI BLK WHI J5 TEMP. SENSOR 100-120 VOLTS AC 2 WIRE + GND SINGLE PHASE REFILL PROBE 40708.
L1 BLK GRN L2 RED SCHEMATIC WIRING DIAGRAM H5X BLK BLK LIMIT THERMOSTAT BLK WHI MAIN ON/OFF SWITCH (Late Models only) WHI/VIO BLU TANK HEATER BLK OVERFLOW PROTECTION SWITCH RED RED WHI/VIO BLK RELAY READY GRY PNK GRY PNK PNK GRY GRY PNK POWER REFILL HEATER MAIN CONTROL BOARD J3 J1 J4 J5 5 4 3 2 1 PNK WHI GRN WHI/BLU SOL WHI BLK WHI GRY GRY t° STEAM SENSOR TEMP. SENSOR 100-120 VOLTS AC 2 WIRE + GND SINGLE PHASE REFILL PROBE 40709.
L1 BLK GRN L2 RED SCHEMATIC WIRING DIAGRAM H5E BLK BLK LIMIT THERMOSTAT BLK RED MAIN ON/OFF SWITCH (Late Models only) WHI/VIO BLU TANK HEATER BLK OVERFLOW PROTECTION SWITCH RED RED WHI/VIO BLK RELAY READY GRY PNK GRY PNK PNK GRY GRY PNK POWER REFILL HEATER MAIN CONTROL BOARD J3 J1 J4 5 4 3 2 1 PNK RED GRN WHI/BLU SOL RED BLK WHI J5 TEMP. SENSOR 200-240 VOLTS AC 2 WIRE + GND SINGLE PHASE REFILL PROBE 40710.
L1 BLK GRN L2 RED SCHEMATIC WIRING DIAGRAM H5X BLK BLK LIMIT THERMOSTAT BLK RED MAIN ON/OFF SWITCH (Late Models only) WHI/VIO BLU TANK HEATER BLK OVERFLOW PROTECTION SWITCH RED RED WHI/VIO BLK RELAY READY GRY PNK GRY PNK PNK GRY GRY PNK POWER REFILL HEATER MAIN CONTROL BOARD J3 J1 J4 J5 5 4 3 2 1 PNK RED GRN WHI/BLU SOL RED BLK WHI GRY GRY t° STEAM SENSOR TEMP. SENSOR 200-240 VOLTS AC 2 WIRE + GND SINGLE PHASE REFILL PROBE 40711.
SCHEMATIC WIRING DIAGRAM H5XA, H5EA L1 L2 RED BLK GRN/YEL RFI SUPPRESSION CAPACITOR BLK LIMIT THERMOSTAT LIMIT THERMOSTAT BLK BLU BLK WHI/VIO TANK HEATER BLK BLK BLK OVERFLOW PROTECTION SWITCH RED RED EMI FILTER RELAY GRY PNK GRY PNK PNK GRY GRY PNK REFILL WHI/VIO BLK READY POWER RED RED J3-1 J3-5 J3-8 J1-1 HEATER 5 4 3 2 1 PNK RED GRN WHI/BLU SOL RED MAIN CONTROL BOARD J4-1 J4-2 BLK WHI H5XA only J1-5 230 VOLTS AC 2 WIRE + GND SINGLE PHASE JUMPER INSTALLED ACROSS PIN
