Bunn OT Service Manual download pdf (Page 13)

Page 13

FIG. 2 BREW TIMER

FIG. 3 BREW TIMER WIRING

SERVICE (cont.)

Brew Timer (Early Models)

Location:

The brew timer is located behind the front panel

to the right of the tank, FIG. 2.

Test Procedure:

1. Disconnect the brewer from the power source

and separate the polarized, three-pin connectors

between the timer and brewer wiring harness and

rotate the brew timer dial fully counterclockwise.

2. Check the voltage across sockets 2 & 3 (white or

red and black wires) of the female connector with

a voltmeter when the On/Off brew station warmer

switch is in the upper position. Connect the

brewer to the power source. The indication must:

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

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

240 volt models and three wire 120/240 volt

models.

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

3. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #4.

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

ing Diagrams and check the brewer wiring harness.

4. Check the voltage across sockets 1 & 2 (blue and

white or red wires) of the female connector with

a voltmeter when the On/Off brew station warmer

switch is in the upper position and the start switch

is pressed to the lower position and held. Con-

nect the brewer to the power source. The indica-

tion must be as described in step 2, until the start

switch is released.

5. Disconnect the brewer from the power source.

If voltage is present as described, reconnect the po-

larized, three-pin connectors, and proceed to #6.

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

ing Diagrams and check the brewer wiring harness.

6. Disconnect the in-line connectors on the black

and white wires from the timer to the solenoid.

7. Check the voltage across the black and white

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 as described in

step 2, for approximately 20 seconds and then

return to its previous indication.

8. Disconnect the brewer from the power source.

If voltage is present as described, the brew timer is

operating properly. Reset the timer dial as required,

to obtain the desired brew volume.

If voltage is not present as described, replace the brew

timer.

Removal and Replacement:

1. Separate all connectors between the brewer wir-

ing harness and the timer.

2. Remove the two 8-32 slotted-head screws hold-

ing the timer to the bracket.

3. Install the new timer to the bracket.

4. Refer to FIG.3 when reconnecting the wires.

5. Readjust the timer dial as required.

MINUTES

BUNN-O-MATIC

P/N 2235-120 VAC

MINUTES

BUNN-O-MATIC

P/N 2235-120 VAC

P1 BLU to Start Switch

P2 WHI (see below)

P3 BLK to ON/OFF Brew Station

Warmer Switch

WHI to Solenoid Coil

BLK to Solenoid Coil

P1690

P1691

MODEL

OT WHI to Indicator Lamp

RT WHI to Brew Station Warmer

10021 071700

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 35 36

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