Bunn OL, Operating & Service Manual

Page: 109 / 176

Page 17
FIG. 8 WARMERS
FIG. 9 WARMERS FIG. 10 WARMER WIRING
SERVICE (cont.)
Warmer(s)
OT:
Brew Station & Upper
RT:
Left Rear, Left Front, Brew Station, Right Rear & Right
Front
Location:
OT: One of the warmers is beneath the brew funnel
and the other is on the top lid, FIG. 8.
RT: These warmers include the one beneath the
brew funnel, the ones on the right and left of the brew
station, and the one above and to the left and right of
the brew station as viewed from the front, FIG. 9.
Test Procedure:
1. Once the switch has been tested and switch failure
has been eliminated, proceed as follows.
2. Disconnect the brewer from the power source and
remove the #4-40 screws attaching the warmer
being tested.
3. Lift the warmer assembly from the brewer and
invert the warmer making the wire terminals ac-
cessible for testing.
4. Check for continuity from the switch to the black
wire at the warmer element.
If continuity is present as described, proceed to #5.
5. Check for continuity from the wire terminal of the
white or red wire to the splice or indicator lamp
using the chart below.
If continuity is present as described, proceed to #6.
If continuity is not present as described, refer to the
Wiring Diagrams and check the brewer wiring har-
ness.
6. Check for continuity across the two terminals on
the warmer.
If continuity is present as described, the warmer is
operating properly.
If continuity is not present as described, replace the
warmer.
Removal and Replacement:
1. Remove the #4-40 slotted-head screws holding
the warmer to the brewer
2. Lift the warmer assembly from the brewer.
3. Disconnect both wires from the warmer.
4. Refer to FIG. 10 when reconnecting the wires.
5. Place the new warmer into the brewer and se-
curely attach it using the #4-40 screws.
MODEL
OT Upper WHI OR RED to Indicator Lamp
OT Brew Station WHI OR RED to Indicator Lamp
to Terminal Block
RT Left Rear WHI OR RED to Terminal Block
to Brew Station Warmer
RT Left Front WHI OR RED to Indicator Lamp
to Terminal Block
RT Brew Station WHI OR RED to Timer P2
to Left Rear Warmer
RT Right Front WHI OR RED to Right Rear Warmer
to Indicator Lamp
RT Right Rear WHI OR RED to Right Front Warmer
WHI or RED (see below)
BLK to Warmer Switch
P1687
P1688
P1692
32440 070700
Part II