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Bunn U3A service manual SERVICE cont, Wire Models and 440V Four Wire Models

Models: U3A U3

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SERVICE (cont.)

SERVICE (cont.)

CIRCUIT BREAKER (120/208V and 120/240V Three

Wire Models and 440V Four Wire Models)

P2209.60

FIG. 2 CIRCUIT BREAKER

Location:

The circuit breaker is located on the right rear of the component bracket.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the black wire from the main harness from the circuit breaker and the white wire on the pump assembly. With a voltmeter, check the voltage across the black wire and the white wire. Connect the brewer to the power source. The indication must be:

a)120 volts ac for three wire 120/208 volt and 120/240 volt models.

b)208 or 240 volts ac for four wire 440 volt mod- els.

3.Disconnect the brewer from the power source.

If voltage is present as described, reconnect the white wire to the pump assembly and proceed to #4. If volt- age is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness.

4.With the black wire removed, remove the other black wire from the circuit breaker.

5.Check for continuity across the terminals on the circuit breaker.

If continuity is present as described the circuit breaker is operating properly.

If continuity is not present as described, press the reset button and repeat step 5, if continuity is not present as described, replace the circuit breaker.

Removal and Replacement:

1.Remove wires from the circuit breaker.

2.Remove the nut securing the circuit breaker to the component bracket.

3.Remove circuit breaker and discard.

4.Install new circuit breaker on component bracket and secure with nut.

5.Refer to Fig. 3 and reconnect the wires.

BLK from Main

Harness

BLK from ON/

OFF Switch

FIG. 3 CIRCUIT BREAKER TERMINALS P1723

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Bunn U3A service manual SERVICE cont, Wire Models and 440V Four Wire Models

Contents

BUNN-O-MATIC CORPORATION OPERATING & SERVICE MANUALU3 U3A BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY PageATTENTION TURN OFF WHEN UNATTENDED INTRODUCTIONUSER NOTICES Very Hot Water Use With CareELECTRICAL INSTALLATION INSTRUCTIONS ELECTRICAL REQUIREMENTSPLUMBING REQUIREMENTS INITIAL SETUPCE REQUIREMENTS Volumes INITIAL SETUP contADJUSTING BREW VOLUMES FILTER HOLDER CLEANINGCOFFEE BREWING PROBABLE CAUSE TROUBLESHOOTINGPROBLEM TROUBLESHOOTING cont PROBLEM PROBABLE CAUSEPROBABLE CAUSE REMEDYTROUBLESHOOTING cont PROBLEM PROBABLE CAUSE TROUBLESHOOTING cont PROBLEMRefer to Service - Contactor for testing procedures. See page REMEDYPROBABLE CAUSE TROUBLESHOOTING cont PROBLEMFunnels overflow cont Coffee reservoir overflows REMEDYContents SERVICECOMPONENT ACCESS SERVICE cont Wire Models and 440V Four Wire Models2A. 120/208V, 120/240V, 380V THREE WIRE MODELS CONTACTORSERVICE cont Tank Heater SERVICE cont CONTACTOR contBLK to Right Tank BLK Thermal Fuse to Right Tank Heater BLK to Terminal Block L1Install thermostat and mounting bracket on the SERVICE cont CONTROL THERMOSTATDisconnect the wires from the control thermo FIG. 6 CONTROL THERMOSTATFIG. 9 FUSE HOLDER TERMINALS SERVICE contFIG.8 FUSE AND FUSE HILDER With an ohmmeter, check for continuity across SERVICE cont LIMIT THERMOSTATDisconnect the brewer from the power source SERVICE cont LIQUID LEVEL BOARD AND LEVEL PROBE VoltageSERVICE cont LIQUID LEVEL BOARD AND LEVEL PROBE contFIG. 15 ON/OFF SWITCH TERMINALS SERVICE cont ON/OFF SWITCHRED to Start Switch, Brew Timer & Liquid Level Board SERVICE cont PUMP ASSEMBLY SERVICE cont RELAY BREWERS W/BREW LOCKOUT SERVICE cont RELAY BREWERS W/BREW LOCKOUT BLU fromSERVICE cont SELECTOR SWITCH HALF BATCH OPTION 2. A For 120/208 volt and 120/240 volt three wire, single phase models, 380 volt three wire, three phase models and 380 volt, 440 volt four wire, three phase models, disconnect the black wire from the liquid level board #2 and the white wire on the solenoid. With a voltmeter, check the voltage across the black and the white wire. Connect the brewer to the power source. The indication must be SOLENOIDSERVICE cont SERVICE cont SOLENOID SERVICE cont START SWITCH BREW FIG. 24 START SWITCH BREWFIG. 27 TANK HEATER TERMINALS SERVICE cont TANK HEATERSLEFT FIG. 28 THERMAL FUSES SERVICE cont THERMAL FUSES 230V-CE MODELS ONLYTIMER Early Models SERVICE cont TIMER Early Modelscont To Three Pin FemaleSERVICE cont DIGITAL TIMER Late Models NOTE Half-Batch and full batch settings must each be set separately SERVICE cont DIGITAL TIMER Late ModelsNOTE All volume settings must be done with the sprayhead installed FIG. 33 DIGITAL TIMER TERMINALSFIG. 35 TRANSFORMER TERMINALS SERVICE contTRANSFORMER 380V THREE WIRE MODELS ONLY SERVICE cont MASTER ON/OFF SWITCH Late Models FIG. 36 MASTER ON/OFF SWITCH LOCPage 120/208 VOLTS AC 120/240 VOLTS AC 3 WIRE + GND SINGLE PHASEMAIN ON/OFF SWITCH Late Models only 10060080900 Page10060 10060 SCHEMATIC WIRING DIAGRAM U3A & U38A BREWERS PRIOR TO U300004095Page 08090010060 SCHEMATIC WIRING DIAGRAM U3A - CE BREWERS S/N U300004095 - UPPage 08090010060 SCHEMATIC WIRING DIAGRAM U3833Page 08090010060 SCHEMATIC WIRING DIGRAM U3833Page 080900