H5m 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 operating manual, or to view the illustrated parts catalog, programming manual, or service manual, ple...
2 10267 012609 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 warranty .......................................................2 introduction ..................................................3 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. The h5m dispenser requires 2-wire, grounded service rated 120, 208, or 240 volts ac, 20 amp, single phase. The h5ma, 230v-ce dispenser requires 2-wire, grounded service rat...
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 rotate the control thermostat knob fully counterclockwise to the “off” position and replace the panel. 2. C...
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.) 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- penser. 5. Check for continuity across the terminals of the limit thermostat. If continuity is...
11 service (cont.) safety overflow switch location: the safety overflow switch is located inside the rear of the dispenser inside the copper overflow cup. Test procedure: 1. Once voltage is verified at the power source, check for continuity across the safety overflow switch red wires only until the ...
12 service (cont.) solenoid valve location: the solenoid valve is located inside the rear of the dispenser on the right side near the bottom. 6. 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...
13 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....
14 fig. 10 thermostat wiring blu/blk to limit thermostat blk to terminal block p1782 service (cont.) thermostat location: the mechanical thermostat is located inside the upper rear panel. To test the thermostat, access will also be needed to the terminal block located inside the bottom access panel....
15 service (cont.) liquid level board location: the liquid level board is located inside the lower panel. Test procedure: 1. Disconnect the dispenser from the power source. 2. Remove the blue wire from terminal 1 and the pink wire from terminal 4 of the circuit board. 3. Check the voltage across ter...
16 15. Move the probe’s flat end to the dispenser housing. The indication must be 0. 16. Move the probe’s flat end away from the dis- penser housing. The indication should again be: a.) 100 to 120 volts ac for 100 to 120 volt mod- els, b.) 200 to 240 volts ac for 200 to 240 volt mod- els, c.) 230 vo...
17 location: the contactor is located on the component bracket inside the lower rear panel. Test procedures: 1. Disconnect the dispenser from the power source. 2. Disconnect the black wire from the contactor coil to the limit thermostat and black wire from the red wire on the main harness on two wir...
18 blk to left tank heater red to terminal block(l2) blk to terminal block (l1) red to right tank heater blk to limit thermostat red from main harness p1725 fig.14 contactor wiring removal and replacement: 1. Disconnect all the wires from the contactor. 2. Remove the two #8-32 screws securing the co...
19 4 3 1 2 liquid level board blu/blk tank heater 120 volts a c 2 wire + gnd single phase 10243.0000e 01/07 © 1987 bunn-o-matic corporation schematic wiring diagram h5m blk blk blk sol whi blu whi whi blk blk (probe) p n k red red blk sw& thermostat optional ready indicator overflow protection switc...
20 wiring diagrams 4 3 1 2 liquid level board blk sw& thermostat 10262.0001b 04/09 © 1999 bunn-o-matic corporation schematic wiring diagram h5ma, 230v ce l1 l2 sol green blu blk blk (probe) p n k red red red blu/blk blk red-12 blk-12 n.O. N.O. K red red red tank heater 230 volts a c 2 wire single ph...
