Bunn STA, STFA, SA service manual SERVICE cont, Brew Timer

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FIG. 14 BREW TIMER

SERVICE (cont.)

BREW TIMER (Early Models ST, STA, STF & STFA)

OLD STYLE

P1594

FIG. 14 BREW TIMER

Location:

The timer dial is located inside the front inspection panel on the top of component mounting bracket. The timer board is located inside the rear inspection panel on the component mounting bracket.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Rotate the dial fully counterclockwise.

3.With a voltmeter, check the voltage across termi- nals TL1 and TL2 when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source. The indication must be:

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

b.) 200 to 240 volts ac for two wire 200 or 240 volt models.

4.Disconnect the brewer from the power source.

If voltage is present as described, proceed to #5.

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

5.Disconnect the white/orange wire from terminal TL3 and the white/yellow wire from terminal TL5. Check for continuity across the two wires when the start switch is pressed to the "START" position.

If continuity is present as described, reconnect the wires and proceed to #6.

If continuity is not present as described, refer to the Wiring Diagrams and check the brewer wiring har- ness.

6.With a voltmeter, check the voltage across termi- nals TL1 and TL4 when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source. The indication must be zero.

If voltage indications are other than described, discon- nect the brewer from the power source and replace the timer.

If voltage is correct, proceed to #7.

7.With a voltmeter, check the voltage across termi- nals TL1 and TL4 when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source and press the start switch. The indication must be:

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

b.) 200 to 240 volts ac for two wire 200 or 240 volt models.

If voltage indications are other than described, discon- nect the brewer from the power source and replace the timer.

If voltage is correct, readjust the timer as required.

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29251 082100

 

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Contents BUNN S,SA POST OFFICE BOX SPRINGFIELD, ILLINOISFAX ST,STA STF,STFAWARRANTY USER NOTICES#00882.0000 USER NOTICES Continued#00656.0000 #02763.0000 #02765.0000 #02769.0000Electrical Hook-Up ELECTRICAL REQUIREMENTSPLUMBING REQUIREMENTS Models S & SA4B. Models ST, STA INITIAL SET-UP4A. Models S & SA 4C. Models STF & STFASTART SWITCH CLEANINGModels ST, STF, STA & STFA ON/OFF SWITCH OPERATING CONTROLSTROUBLESHOOTING PROBABLE CAUSE TROUBLESHOOTING contPROBLEM REMEDYTROUBLESHOOTING cont PROBLEM Dripping from sprayhead Beverage overflows dispenser cont Weak beverage Brewer is making unusal noises COMPONENT ACCESS SERVICEContents SERVICE cont CONTROL THERMOSTATSERVICE cont CONTROL THERMOSTAT cont SERVICE cont LIMIT THERMOSTAT ON/OFF SWITCH Models ST, STA, STF & STFA FIG. 8 SOLENOID START SWITCH Models ST, STA, STF & STFA SERVICE cont TANK HEATER SERVICE cont TANK HEATER Cont FIG. 14 BREW TIMER SERVICE cont BREW TIMER Early Modelscont DIGITAL BREW TIMER Late Models FIG. 16 DIGITAL BREW TIMERSERVICE cont DIGITAL BREW TIMER Late Modelscont LIQUID LEVEL CONTROL BOARD Models STF & STFA STFACont SERVICE cont TIMER RELAY Models STF & STFA SERVICE cont WARMER ELEMENTS SERVICE cont THERMAL CUT-OFFModels SA, STA & STFA Page 29251Page 29251Page 29251Page 29251Page 29251Page 29251Page 29251Page 29251Page 29251Page 29251Page 29251Page 29251Page 29251