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Bunn U3A service manual SERVICE cont RELAY BREWERS W/BREW LOCKOUT, BLU from

Models: U3A U3

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BLU from

SERVICE (cont.)

RELAY (BREWERS W/BREW LOCKOUT)

Removal and Replacement:

1.Disconnect the wires from the relay.

2.For 120/208V, 120/240V, 208V, 380V, 440V and 240V models prior to #U300004095 remove the #6-32 screw securing the relay to the relay mount- ing bracket. For 230V models #U300004095 and up, remove the two screws securing the relay to the relay mounting bracket.

3.Remove relay and discard.

4.For 120/208V,120/240V, 208V, 380V, 440V and 240V models prior to #U300004095, install new relay on relay mounting bracket and secure with a #6-32 screw. For 230V models #U300004095 and up, install new relay on relay mounting bracket and secure with two #6-32 screws.

5.Refer to Fig. 19 and reconnect the wires.

BLU from
Start Switch						BLU from
						BLU from
			2	3		Brew Timer
	1		2	6
				6
				9
	4			9
	4
	7					BLK to Control
RED from	A					BLK to Control
RED from						Thermostat
Main Harness						Thermostat
Main Harness
120/208V, 120/240V, 208V, 380V, 440V AND 240V
MODELS PRIOR TO #U300004095
					BLU to Start
					Switch
						BLU from
				2	3	Brew Timer
						Brew Timer
		1
		1		5
		4		5
		4		8		RED to Control
				8

BLK from	A					Thermostat
	A

Main Harness
230V MODELS #U300004095 AND UP
FIG.19 RELAY TERMINALS							P1739
FIG.19 RELAY TERMINALS

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Bunn U3A service manual SERVICE cont RELAY BREWERS W/BREW LOCKOUT, BLU from

Contents

U3 U3A OPERATING & SERVICE MANUALBUNN-O-MATIC CORPORATION Page BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTYUSER NOTICES INTRODUCTIONATTENTION TURN OFF WHEN UNATTENDED Very Hot Water Use With CareELECTRICAL REQUIREMENTS ELECTRICAL INSTALLATION INSTRUCTIONSCE REQUIREMENTS INITIAL SETUPPLUMBING REQUIREMENTS ADJUSTING BREW VOLUMES INITIAL SETUP contVolumes COFFEE BREWING CLEANINGFILTER HOLDER PROBLEM TROUBLESHOOTINGPROBABLE CAUSE PROBABLE CAUSE TROUBLESHOOTING cont PROBLEMTROUBLESHOOTING cont PROBLEM REMEDYPROBABLE CAUSE Refer to Service - Contactor for testing procedures. See page TROUBLESHOOTING cont PROBLEMPROBABLE CAUSE REMEDYFunnels overflow cont Coffee reservoir overflows TROUBLESHOOTING cont PROBLEMPROBABLE CAUSE REMEDYCOMPONENT ACCESS SERVICEContents Wire Models and 440V Four Wire Models SERVICE contSERVICE cont CONTACTOR2A. 120/208V, 120/240V, 380V THREE WIRE MODELS BLK to Right Tank SERVICE cont CONTACTOR contTank Heater BLK Thermal Fuse to Right Tank Heater BLK to Terminal Block L1Disconnect the wires from the control thermo SERVICE cont CONTROL THERMOSTATInstall 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 Voltage SERVICE cont LIQUID LEVEL BOARD AND LEVEL PROBELIQUID LEVEL BOARD AND LEVEL PROBE cont SERVICE 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 BLU from SERVICE cont RELAY BREWERS W/BREW LOCKOUTSERVICE 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 FIG. 24 START SWITCH BREW SERVICE cont 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 To Three Pin Female SERVICE cont TIMER Early ModelscontSERVICE cont DIGITAL TIMER Late Models NOTE All volume settings must be done with the sprayhead installed SERVICE cont DIGITAL TIMER Late ModelsNOTE 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 FIG. 36 MASTER ON/OFF SWITCH LOC SERVICE cont MASTER ON/OFF SWITCH Late ModelsMAIN ON/OFF SWITCH Late Models only 120/208 VOLTS AC 120/240 VOLTS AC 3 WIRE + GND SINGLE PHASEPage 1006010060 Page080900 Page SCHEMATIC WIRING DIAGRAM U3A & U38A BREWERS PRIOR TO U30000409510060 080900Page SCHEMATIC WIRING DIAGRAM U3A - CE BREWERS S/N U300004095 - UP10060 080900Page SCHEMATIC WIRING DIAGRAM U383310060 080900Page SCHEMATIC WIRING DIGRAM U383310060 080900