Electronic Control - Bunn Single Operating & Service Manual

SERVICE (cont.)
ELECTRONIC CONTROL ASSEMBLY (cont.)
GRY & GRY to
Interlock Assy
WHI & WHI to Tem-
perature Sensor
PNK (Top) &
GRY (Bottom) to
Interlock Assy
PNK (Top) &
GRY (Bottom)
from LED
!
D O C A
N O
U T
U n
T
t i l W
T u
I O
r n
a t e
O n
r C N
H o
T h
A u
t W o m
e T
t o m
a t e e s
a t i a n
r S F r o
C o c a k H
y s
l l y
m O
A c f f e t e m e a
W h
e B
c o t e r
s – p e
r d a e n
r e w
U n W a n e S w
n c
e r s
F a e W i t I d F
t e r i t c h
s C
i l u – F
i t h T a a u
r e o n
i l l T n k c e t
T h n e
T o
e I W i
h e c t e !
C o n s l l F
W a d T
t a l
i l l
m p t e r
l a t o P
i o n
l y T a o w
n k
V o I n s e r !
t r u I n
i d s
c t i o
W a
n s
r r a !
n t y
!
W A
R N
I N G
H A
Z A
R D
V O
O U
L T
S
A G
D I S
E
C O
N N
P O
E C
W E
B E
T F
F O R S
R O
R E
O U
M
R E R C
M O E
V I N
G !
FIG 12. ELECTRONIC CONTROL
ASSEMBLY TERMINALS
Triac Assembly Removal and Replacement
NOTE - Each triac installation requires the use of an
approved silicone heat sink compound. Bunn-O-Matic
recommends the use of Dow Corning 340 compound
or equivalent. It can be purchased direct from Bunn-
O-Matic (part number M2522.1000).
1. Place the tank heater switch on the electronic
control assembly in the "OFF" position.
2. Completely drain the tank.
3. Place a stryofoam or wood block between the
center of the tank and the rear of the brewer.
4. Disconnect triac wires, white/violet from terminal
block, blue from tank heater, blue from electronic
control and tan from tank heater switch.
5. Carefully set the brewer on its back.
6. Remove the 2" dia hole plug from the bottom
cover.
i t c h
N
S w
I O
!
t e r c e t
U T
e a
a u
k H d F
C A
a n n e
i l l
e T p e
l l F e r !
P 1 T h m O W i
o w
!
O n n k o P
F r o
T a
d T
I n
r n t e r
e s
T u c t e n k !
W a n s
T a
o m n e
c t i o
T s – o n t e r
r C
N O s C W a t r u
P 2 !
a t e t e m I n s n t y
i t I
P 4
D O y s h e
U n i o n r r a
t i l W i l l T
r S
l a t
e n W a
a t e – F t a l
U n W h
n s
t W e r s i d s
l l y e I
H o
c a r e w T h V o
a t i
e B i t h l y
t o m
f f e e W m p
P 3
A u
C o n c
C o
r d a
T o
c o
A c r e
i l u
F a
I N G
R N
W A
S
O U
R D
E
Z A
A G
H A
L T
V O
M
R O
T F
E
E C
R C
G !
N N
O U
V I N
C O
R S
M O
D I S
W E
R E
P O
R E
F O
B E
#7 BLU from Triac Assy
#6 WHI/BRN to Tank Heater Switch
TAN from Triac Assy to Tank Heater
Switch
#5 PNK to Liquid Level Probe
#4 RED to Terminal Block (Red
Insert on 120/208, 120/240, 200 or
240 Volt Models)
WHI to Terminal Block (White insert
on 120V Models)
#3 VIO to RED Lead from Liquid
Level Switch
#2 GRN to Ground
#1 WHI/BLU to Solenoid
P924
7. Remove the two #8-32 keps nuts securing tank to
tank mounting bracket.
8. Remove the twelve #8-32 slotted head screws
securing the bottom cover.
9. Remove the bottom cover with the four feet, the
tank mounting brackets, triac/heat sink as an as-
sembly.
10. Remove triac/heat sink from tank mounting bracket
and discard.
11. Install new triac/heat sink assembly on tank mount-
ing bracket.
12. Route the wires up around the rear of the brew-
er.
13. Reinstall the bottom cover, four feet, tank mounting
brackets and triac/heat sink to the bottom of the
tank using two #8-32 keps nuts.
14. Secure bottom cover to brewer base with
twelve #8-32 slotted head screws.
15. Stand the brewer upright.
16. Reconnect the wires of the new triac assembly.
Refer to Fig. 13 when reconnecting wires.
WHI/VIO to Terminal BLock (120V White Insert,
120/208V,120/240V,200V and 240V Red Insert)
BLU to Tank Heater
BLU to Electronic Control #7
TAN to Tank Heater Switch
FIG. 13 TRIAC TERMINALS
Page 27
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