Warmer(S) - Bunn SLF Operating & Service Manual

SERVICE (cont.)
Control Thermostat (cont.)
FIG. 3 THERMOSTAT WIRING

Warmer(s)

N
S
M
RA WH I
DI AG GRE EN
IN G
W IR WH I
5W
M AT IC 142 TER
K HEA WH I
HE LIM IT AT BLK TAN
SC RM OST 50W TER
THE RM " HEA I
. & P WA WH
SW OST AT BLU "KEE WH I
THE RM P2
WH I PIN IN S OF
L1 100 W R ARE EE-P
REA P2, & P3 ZED THR TOR . WH I
BLK TOP RM ER P1, A POL ARI NEC
BLU /BLK WA CON I
P1 WH
WH I 100 W
FRO ER NT
BLU /BLK TOP WA RM
BRN /BLK
P3 N
BLK 100 W ER ATIO
WA RM COR POR
BRN /BLK LOW ER TIC
N-O -MA
BUN 8
BLK © 198
O 3/97
WH I/VI 000 D
100 43.0
2 WI RE
BLK AC E
LTS E PH AS
VO GL HZ
120 SIN 60
FIG. 4 WARMERS
Location:
One of the warmers is beneath the brew funnel
and the other is on the top lid, FIG. 4.
Test Procedure:
1. Once the switch has been tested and switch fail-
ure 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 white
wire at the warmer element.
BLK to Terminal Block
BLU/BLK to Limit
Thermostat
P2024
T
AR
ST
ON T
P FR
W ER TO
/ LO
ON
W ER
T LO
ON
P FR
TO
AR
P RE
P RE AR
TO
TO
T
H O
E
A R
E S
A C
R F
S U
A N D
R S
M E
A R
W
N
U T IO
C A
!
P1712
If continuity is present as described, proceed to #5.
5. Check for continuity from the wire terminal of the
blue/black or violet wire to the warmer switch.
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. 5 when reconnecting the wires.
5. Place the new warmer into the brewer and securely
attach it using the #4-40 screws.
Top Warmer
Lower Warmer
FIG. 5 WARMER WIRING
Page 14
WHI to Warmer Switch
BLU/BLK to Warmer
Switch
VIO to On/Lower
Switch
WHI to Terminal
Block
P1692
(Added November 1999)