Operating & service manual bunn-o-matic corporation post office box 3227 springfield, illinois 62708-3227 phone: (217) 529-6601 fax: (217) 529-6644 www.Bunnomatic.Com h5e h5x 10420.0000m 02/08 © 1989 bunn-o-matic corporation to ensure you have the latest revision of the manual or to obtain the illus...
2 10420 020608 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) compresso...
3 contents introduction ..................................................2 warranty .......................................................2 user notices .................................................3 electrical requirements ................................4 plumbing requirements .................
4 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.) ...
5 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. Remove the upper rear panel and place the tank heater switch in the “off” position and replace the panel. 2. Connect the dispenser to the p...
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 technical service department. • inspection, testing, and repair of elect...
7 troubleshooting (cont.) problem probable cause remedy automatic refill will not oper- ate after drawing hot water. Water flows into the tank con- tinuously (dispenser discon- nected from power source). Water flows into the tank con- tinuously (dispenser connect- ed to power source). Water is cold....
8 troubleshooting (cont.) problem probable cause remedy water boils continuously. Dispenser is making unusual noises. Ready indicator will not light. (when temperature is within 4° of its selected setting.) 1. Temperature control 2. Lime build-up 1. Solenoid valve 2. Plumbing lines 3. Water supply 1...
9 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 so...
10 service (cont.) electronic controls 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 benea...
11 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 elec- tronic control assembly with a voltmeter. Connect the dispenser to the power source. The indication must be: ...
12 service (cont.) electronic controls (cont.) 7. Reconnect the pink wire to terminal 5 of the elec- tronic control assembly. 8. Loosen the compression fitting, remove the probe from the tank lid, and inspect it for mineral depos- its. Replace it if necessary. Keep the exposed ends of the probe away...
13 service (cont.) electronic controls (cont.) if the indicator was on or blinking, the temperature sen- sor 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 co...
14 service (cont.) electronic controls (cont.) electronic controls removal and replacement note - each electronic control assembly is calibrated to a temperature sensor probe. Both components must be replaced as a set. 1. Remove all wires from the electronic control as- sembly terminals. 2. Remove t...
15 10420 060305 service (cont.) 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. If adjustment is required, us...
16 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 wa...
17 service (cont.) safety overflow switch location: the safety overflow switch is located inside the rear of the dispenser inside the copper overflow cup. For testing or removal of the safety overflow switch, access may also be needed by removing the two screws attaching the electronic control assem...
18 service (cont.) solenoid valve 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 assembly. 7. Check the solenoid valve for coil action. Connect the dispenser ...
19 service (cont.) tank heater location: the tank heater is located in the tank lid. Test procedure: 1. Disconnect the dispenser from the power source. 2. Check the voltage across the terminals of the tank heater with a voltmeter. Connect the dispenser to the power source. The indication must be: a....
20 wiring diagrams 10420 121598.
21 wiring diagrams 10420 121598.
22 wiring diagrams 10420 091902.
