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Bunn U3A service manual SERVICE cont START SWITCH BREW, Start Switch Brew

Models: U3A U3

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SERVICE (cont.)

SERVICE (cont.)

START SWITCH (BREW)

FIG. 24 START SWITCH (BREW)	P1317.30
FIG. 24 START SWITCH (BREW)
Location:

The brew start switch is located on the upper right side of the brewer component housing.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Remove the wires from the start switch termi- nals.

3.Check for continuity across the switch terminals when the switch is held in the lower position. Continuity must not be present when the switch is in the upper position.

If continuity is present as described, reconnect the wires the switch is operating properly.

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

Removal and Replacement:

1.Remove the wires from the switch terminals.

2.Compress the clips on the back side of the switch mounting bracket and gently push the through the opening.

3.Push the new switch into the opening and spread the clips to hold switch in the mounting bracket.

4.Refer to Fig. 25 and reconnect the wires.

BLU to Brew Timer or

Brew Lockout Relay

BLK from ON/OFF Switch

ALL MODELS EXCEPT 230V - CE MODELS

BLU to Brew Timer or

Brew Lockout Relay

RED from ON/OFF

Switch

230V - CE MODELS

P1743

FIG.25 BREW START SWITCH TERMINALS

Page 29	10060	031599

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Bunn U3A service manual SERVICE cont START SWITCH BREW, Start Switch Brew

Contents

BUNN-O-MATIC CORPORATION OPERATING & SERVICE MANUALU3 U3A Page BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTYUSER NOTICES INTRODUCTIONATTENTION TURN OFF WHEN UNATTENDED Very Hot Water Use With CareELECTRICAL 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 Refer to Service - Contactor for testing procedures. See page TROUBLESHOOTING cont PROBLEMPROBABLE CAUSE REMEDYFunnels overflow cont Coffee reservoir overflows TROUBLESHOOTING cont PROBLEMPROBABLE CAUSE REMEDYContents SERVICECOMPONENT ACCESS Wire Models and 440V Four Wire Models SERVICE cont2A. 120/208V, 120/240V, 380V THREE WIRE MODELS CONTACTORSERVICE cont 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. 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 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 TERMINALSFIG. 35 TRANSFORMER TERMINALS SERVICE contTRANSFORMER 380V THREE WIRE MODELS ONLY 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 10060080900 Page10060 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