Bunn 41722.0000A manual Inlet Valves

Page 17

SERVICE (cont.)

 

 

 

 

INLET VALVES

 

 

 

three wire 120/240 volt models.

 

 

 

 

 

 

 

 

 

 

 

 

b) 200 to 230 volts ac for two wire 200 or 230 volt

 

 

 

 

 

 

models.

 

 

 

 

 

7.

Disconnect the brewer from the power source,

 

 

 

 

 

If voltage is present as described, proceed to #8

 

 

 

 

 

If voltage is not present as described, refer to Wiring

 

 

 

 

 

Diagrams and check brewer wiring harness.

 

 

 

 

 

8.

Check for continuity across the solenoid termi-

 

 

 

 

 

 

nals.

 

 

 

 

 

If continuity is present as described, reconnect the

 

 

 

 

 

white and black wire from the timer.

 

 

 

 

 

If continuity is not present as described, replace the

 

FIG. 17-1 INLET VALVES

 

 

 

 

 

 

 

solenoid valve.

 

 

 

 

Location:

 

 

Removal and Replacement:

The solenoid valve(s) are located inside the trunk

1.

Disconnect the brewer from the power source.

on the lower center part of the component bracket. So-

2.

Turn off the water supply to the brewer.

lenoids in the early models are located in the hood.

3.

Remove the wires from the solenoid.

 

 

 

 

 

Test Procedures:

 

 

4.

Disconnect the water lines to and from the solenoid

 

 

 

valve.

1. Check the solenoid valve for coil action. With "ON/

 

5.

Remove the two screws securing the solenoid

OFF" switch in the "ON' upper position press start

 

mounting bracket to the component bracket.

switch and listen carefully in the vicinity of the

 

6.

Install new solenoid valve to the component

solenoid valve for a" clicking" sound

as the coil

 

bracket.

magnet attracts.

 

 

 

 

 

7.

Securely fasten the water lines to and from the

2. Disconnect the brewer from the power source.

 

solenoid valve.

 

 

 

 

 

 

If the sound is heard as described and water will not

8.

Refer to schematics when reconnecting the

 

wires.

pass through the solenoid valve, there may be a block-

 

 

 

age in the water line before the solenoid valve or, the

 

 

solenoid valve may require inspection for wear, and

 

 

removal of waterborne particles.

 

 

 

 

If the sound is not heard as described,

proceed to

 

 

#3.

 

 

 

 

 

 

3. Disconnect the brewer from the power source.

4. Connect a voltmeter across the solenoid terminals (leave wires connected).

5. Connect the brewer to the power source. With the "ON/OFF" switch in the "ON" upper position press the start switch.

6. Check the voltage across the solenoid. The indica- tion must be:

a) 120 volts ac for two wire 120 volt models and

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41722 070209

 

Image 17
Contents Phone 217 529-6601 FAX 217 TB3/TB6 SeriesBUNN-O-MATIC Commercial Product Warranty Contents To the brewer Probable Cause RemedyBrew cycle will not start No water Brew cycle will not start Water is not hot ProblemProbable Cause Control Thermostat Tank HeaterSurfaces can initiate corrosive Inconsistent beverage levelReactions resulting in serious LeaksBeverage overflows dispenser Refer to Service Timer for test- ing proceduresSpitting or excessive steaming Dripping from sprayhead Plumbing Lines Water Supply Dry coffee grounds remainFunnel Brewer is making unusal noises Cont Tank heater Problem Probable Cause RemedyBrewer is making unusal noises Tank Heater Location Control thermostat is located in the hood Component AccessControl Thermostat Adjust the control thermostat as required Disconnect the control thermostat wiresLimit Thermostat Remove all wires from limit thermostat termi- nals1680W-120V 1680W-100V 1680W-230V 29.0 33.7 Disconnect the brewer from the power supplyTank Heater Orange light Lighted ON/OFF Switch TB3/TB3QRefer to -2 when reconnecting the wires Through four when the switch is in the oposite Position Switch is located on the front control panelSwitch If continuity is present as described, replace the wires37080.0001to T. Stat Start SwitchesInlet Valves BREW/DILUTION Timer TB3 & TB6 Triacs TH-1/MV-1 Brew solenoid TH-2/MV-2 Dilution solenoid BREW/DILUTION Timer TriacsWhite Red Neutral L2 Digital Brew Timer TB3Q & TB6QTerminals ½ batch connector Triacs MV-2 Brew solenoid output MV-1 Line Digital Timer TriacsVolts AC Wire Single Phase Schematic Wiring Diagram TB3QSchematic Wiring Diagram TB3, TB3B, TB3-LP Schematic Wiring Diagram TB3Q Schematic Wiring Diagram TB3Q W/SWEETENER & Empty BAG Detect Schematic Wiring Diagram TB6 Schematic Wiring Diagram TB6Q