Manuals / Bunn / Kitchen Appliance / Coffeemaker

Bunn U3A service manual SERVICE cont CONTACTOR cont, BLK to Right Tank, Tank Heater

Models: U3A U3

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SERVICE (cont.)

SERVICE (cont.)

CONTACTOR (cont.)

9.Check for continuity across the terminals on the left side of the contactor by manually closing the contacts. Continuity must not present when the contact is released.

10.Check for continuity across the terminals on the right side of the contactor by manually closing the contacts.Continuity must not be present when the contact is released.

If continuity is present as described, the contactor is operating properly.

If continuity is not present as described, replace the contactor.

Removal and Replacement:

1.Disconnect all the wires from the contactor.

2.Remove the two #8-32 screws securing the con- tactor to the contactor mounting bracket, remove contactor and protective shield. Discard contac- tor.

3.Install new contactor with shield between mounting bracket and contactor and secure with two #8-32 screws

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

BLK to Right Tank
Heater (T1)		RED to Left Tank
BLK to Terminal		RED to Left Tank
BLK to Terminal		Heater (T2)
Block (L1)		RED to Terminal
		Block(L2)

BLK to left Tank Heater (L1)

RED to Right

Tank Heater

(L2)

		WHI from Main Harness
	BLK to Limit	(120/208V,120/240V,380V
	BLK to Limit	Three Wire Models, 380V and
	Thermostat	Three Wire Models, 380V and
	Thermostat	440V Four Wire Models)
		440V Four Wire Models)
		RED from Main Harness
		(208V, 240V Two Wire Models
		and 208, 240V Three Wire

BLK to Terminal Block (L2)

BLK Thermal

Fuse to Left

Tank Heater

RED Thermal Fuse to Right Tank Heater

BLK Thermal Fuse to Right Tank Heater BLK to Terminal Block (L1)

RED Thermal Fuse to Left Tank Heater RED to Terminal Block (L2)

RED to Limit

Thermostat

Models)

120/208V, 120/240V, 208V,

240V, 380V 440V MODELS

230V - CE Models

FIG.5 CONTACTOR TERMINALS

P1725

Page 16	10060	080900

Image 16

Bunn U3A service manual SERVICE cont CONTACTOR cont, BLK to Right Tank, Tank Heater

Contents

U3 U3A OPERATING & SERVICE MANUALBUNN-O-MATIC CORPORATION BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY PageINTRODUCTION USER NOTICESATTENTION TURN OFF WHEN UNATTENDED Very Hot Water Use With CareELECTRICAL INSTALLATION INSTRUCTIONS ELECTRICAL REQUIREMENTSCE REQUIREMENTS INITIAL SETUPPLUMBING REQUIREMENTS ADJUSTING BREW VOLUMES INITIAL SETUP contVolumes COFFEE BREWING CLEANINGFILTER HOLDER PROBLEM TROUBLESHOOTINGPROBABLE CAUSE TROUBLESHOOTING cont PROBLEM PROBABLE CAUSETROUBLESHOOTING cont PROBLEM REMEDYPROBABLE CAUSE TROUBLESHOOTING cont PROBLEM Refer to Service - Contactor for testing procedures. See pagePROBABLE CAUSE REMEDYTROUBLESHOOTING cont PROBLEM Funnels overflow cont Coffee reservoir overflowsPROBABLE CAUSE REMEDYCOMPONENT ACCESS SERVICEContents SERVICE cont Wire Models and 440V Four Wire ModelsSERVICE cont CONTACTOR2A. 120/208V, 120/240V, 380V THREE WIRE MODELS SERVICE cont CONTACTOR cont BLK to Right TankTank Heater BLK Thermal Fuse to Right Tank Heater BLK to Terminal Block L1SERVICE cont CONTROL THERMOSTAT Disconnect the wires from the control thermoInstall thermostat and mounting bracket on the FIG. 6 CONTROL THERMOSTATFIG.8 FUSE AND FUSE HILDER SERVICE contFIG. 9 FUSE HOLDER TERMINALS Disconnect the brewer from the power source SERVICE cont LIMIT THERMOSTATWith an ohmmeter, check for continuity across SERVICE cont LIQUID LEVEL BOARD AND LEVEL PROBE VoltageSERVICE cont LIQUID LEVEL BOARD AND LEVEL PROBE contRED to Start Switch, Brew Timer & Liquid Level Board SERVICE cont ON/OFF SWITCHFIG. 15 ON/OFF SWITCH TERMINALS 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 SERVICE cont SOLENOID2. 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 SERVICE cont SOLENOID SERVICE cont START SWITCH BREW FIG. 24 START SWITCH BREWLEFT SERVICE cont TANK HEATERSFIG. 27 TANK HEATER TERMINALS TIMER Early Models SERVICE cont THERMAL FUSES 230V-CE MODELS ONLYFIG. 28 THERMAL FUSES SERVICE cont TIMER Early Modelscont To Three Pin FemaleSERVICE cont DIGITAL TIMER Late Models SERVICE cont DIGITAL TIMER Late Models NOTE All volume settings must be done with the sprayhead installedNOTE Half-Batch and full batch settings must each be set separately FIG. 33 DIGITAL TIMER TERMINALSTRANSFORMER 380V THREE WIRE MODELS ONLY SERVICE contFIG. 35 TRANSFORMER TERMINALS SERVICE cont MASTER ON/OFF SWITCH Late Models FIG. 36 MASTER ON/OFF SWITCH LOC120/208 VOLTS AC 120/240 VOLTS AC 3 WIRE + GND SINGLE PHASE MAIN ON/OFF SWITCH Late Models onlyPage 1006010060 Page080900 SCHEMATIC WIRING DIAGRAM U3A & U38A BREWERS PRIOR TO U300004095 Page10060 080900SCHEMATIC WIRING DIAGRAM U3A - CE BREWERS S/N U300004095 - UP Page10060 080900SCHEMATIC WIRING DIAGRAM U3833 Page10060 080900SCHEMATIC WIRING DIGRAM U3833 Page10060 080900