Manuals / Bunn / Kitchen Appliance / Coffeemaker

Bunn U3A service manual SERVICE cont PUMP ASSEMBLY

Models: U3A U3

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SERVICE (cont.)

SERVICE (cont.)

PUMP ASSEMBLY

P2209.60

FIG.16 PUMP ASSEMBLY

Location:

The pump is located on the center rear of the component bracket.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the black wire from the black lead on the pump and the white wire from the black lead on the pump.

3.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, 120/240 volt and 380 volt models).

b)208 volts ac for two or three wire 208 volt models.

c)240 volts ac for two or three wire 240 volt models.

d)230 volts ac for two wire 230 volt models.

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

4.Disconnect the brewer from the power source.

If voltage is present as described, reconnect the wires to the pump. Install swing spout and position over the reservoir. Place the ON/OFF in the "ON" (upper) position and push the start switch and release. If pump does not run, replace the pump.

If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness.

Removal and Replacement (Refer to Fig. 17):

1.Disconnect the wires from the pump assembly.

2.Loosen the #8-32 screw (2) securing the clamp

(3)on the fill tube (1) and slide the clamp (3) up the fill tube (1).

3.Disengage the fill tube (1) from the pump assembly

4.Remove the four #8-32 screws (6) securing the pump assembly (4) to the component bracket

5.Remove pump assembly (4).

6.Remove pump gasket (5) and inspect, replace if necessary.

7.Position gasket (5) on component bracket (7).

8.Install new pump assembly (4) on component bracket (7) and secure with four #8-32 screws

9.Install fill tube (1) on pump assembly (4).

10.Slide clamp (3) down into position on the fill tube

(1)and tighten screw (2).

11.Refer to Fig. 17 and reconnect the wires.

	WHI from Brew Timer
	BLK from Brew Timer
1
2
3		6
		6
4
5
		7
	FIG.17 PUMP INSTALLATION	P1737
	FIG.17 PUMP INSTALLATION

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Bunn U3A service manual SERVICE cont PUMP ASSEMBLY

Contents

BUNN-O-MATIC CORPORATION OPERATING & SERVICE MANUALU3 U3A Page BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTYVery Hot Water Use With Care INTRODUCTIONUSER NOTICES ATTENTION TURN OFF WHEN UNATTENDEDELECTRICAL REQUIREMENTS ELECTRICAL INSTALLATION INSTRUCTIONSPLUMBING REQUIREMENTS INITIAL SETUPCE REQUIREMENTS Volumes INITIAL SETUP contADJUSTING BREW VOLUMES FILTER HOLDER CLEANINGCOFFEE BREWING PROBABLE CAUSE TROUBLESHOOTINGPROBLEM PROBABLE CAUSE TROUBLESHOOTING cont PROBLEMPROBABLE CAUSE REMEDYTROUBLESHOOTING cont PROBLEM REMEDY TROUBLESHOOTING cont PROBLEMRefer to Service - Contactor for testing procedures. See page PROBABLE CAUSEREMEDY TROUBLESHOOTING cont PROBLEMFunnels overflow cont Coffee reservoir overflows PROBABLE CAUSEContents SERVICECOMPONENT ACCESS Wire Models and 440V Four Wire Models SERVICE cont2A. 120/208V, 120/240V, 380V THREE WIRE MODELS CONTACTORSERVICE cont BLK Thermal Fuse to Right Tank Heater BLK to Terminal Block L1 SERVICE cont CONTACTOR contBLK to Right Tank Tank HeaterFIG. 6 CONTROL THERMOSTAT SERVICE cont CONTROL THERMOSTATDisconnect the wires from the control thermo Install thermostat and mounting bracket on theFIG. 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 Voltage SERVICE cont LIQUID LEVEL BOARD AND LEVEL PROBELIQUID LEVEL BOARD AND LEVEL PROBE cont SERVICE 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 BLU from SERVICE cont RELAY BREWERS W/BREW LOCKOUTSERVICE 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 FIG. 24 START SWITCH BREW SERVICE cont 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 To Three Pin Female SERVICE cont TIMER Early ModelscontSERVICE cont DIGITAL TIMER Late Models FIG. 33 DIGITAL TIMER TERMINALS SERVICE cont DIGITAL TIMER Late ModelsNOTE All volume settings must be done with the sprayhead installed NOTE Half-Batch and full batch settings must each be set separatelyFIG. 35 TRANSFORMER TERMINALS SERVICE contTRANSFORMER 380V THREE WIRE MODELS ONLY FIG. 36 MASTER ON/OFF SWITCH LOC SERVICE cont MASTER ON/OFF SWITCH Late Models10060 120/208 VOLTS AC 120/240 VOLTS AC 3 WIRE + GND SINGLE PHASEMAIN ON/OFF SWITCH Late Models only Page080900 Page10060 080900 SCHEMATIC WIRING DIAGRAM U3A & U38A BREWERS PRIOR TO U300004095Page 10060080900 SCHEMATIC WIRING DIAGRAM U3A - CE BREWERS S/N U300004095 - UPPage 10060080900 SCHEMATIC WIRING DIAGRAM U3833Page 10060080900 SCHEMATIC WIRING DIGRAM U3833Page 10060