Bunn RT Manual De Propietario

Page 23

FIG. 21 SOLENOID VALVE

FIG. 22 SOLENOID VALVE WIRING

4.  Check the solenoid valve for coil action.  Connect 

the brewer to the power source, place the On/Off 

brew station warmer switch in the upper posi-

tion, press and release the start switch.  Listen 

carefully in the vicinity of the solenoid valve for a 

“clicking” sound as the coil magnet attracts and 

after the approximate setting on the brew timer 

dial, repels the plunger.

5.  Disconnect the brewer from the power source.

If the sound is heard as described and water will not 

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

age in the water line before or after 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, replace the 

solenoid valve.

Removal and Replacement:

1.  Remove all wires from the solenoid valve coil.

2.  Turn off the water supply to the brewer.

3.  Remove the bottom pan attached with one or 

more 8-32 slotted-head screw(s) beneath the 

front of the brewer.

4.  Raise the brewer approximately six inches from 

the counter top and support the feet on something 

sturdy.

5.  Disconnect the water lines to and from the sole-

noid valve.

6.  Remove the two 10-32 screws holding the sole-

noid valve to the bracket.

7.  Lift-out the solenoid valve.

8.  Securely install the new solenoid valve to the 

bracket.  Check the direction of flow arrow on 

the valve.  It must be pointing toward the flow 

control.

9.  Securely fasten the water lines to and from the 

solenoid valve.

10.  Refer to FIG. 22 when reconnecting the wires.

Location:

The solenoid valve is located below and to the left of 

the tank as viewed from the rear, FIG. 21.

Test Procedure:

1.  Check the voltage across the white and black 

wires with a voltmeter when the On/Off brew sta-

tion warmer switch is in the upper position and 

the start switch is pressed to the lower position 

and released.  Connect the brewer to the power 

source.  The indication must be:

 

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

three wire 120/240 volt models,

 

b) 200 or 240 volts ac for two wire 200 volt or 

240 volt models,

 

c) 100 volts ac for two wire 100 volt models,

 

for the approximate setting on the brew timer dial 

and then return to zero.

2.  Disconnect the brewer from the power source.

If voltage is present as described, proceed to #3.

If voltage is not present as described, refer to the Wir-

ing Diagrams and check the brewer wiring harness.

3.  Check for continuity across the solenoid valve 

coil terminals.

If continuity is present as described, reconnect the 

white and black wires and proceed to #4.

If continuity is not present as described, replace the 

solenoid valve.

BLK to Brew Timer

WHI to Brew Timer

P1699

P1588

32440 070700