Bunn DUAL - Electronic Controls Removal and Replacement; Triac Assembly Removal and Replacement

Page 27
RECTIFIERS (cont.)
SERVICE (cont.)
Test Procedures:
1. Disconnect the brewer from the power source;
2. Remove the red wire and the black wire from the
rectifier to be tested.
3. With a voltmeter check the voltage across the
(+) and (-) terminals on the rectifier. Connect the
brewer to the power source. The indication must
be 24 volts dc.
4. Disconnect the brewer from the power source.
If voltage is present as described, the rectifier is op-
erating properly.
If voltage is not present as described, refer to the
brewer wiring diagrams and check the brewer wiring
harness.
Removal and Replacement:
1 Disconnect the wires from the rectifier.
2. Remove the #6-32 truss head screw securing the
rectifier to the brew base plate.
3. Remove the rectifier and discard.
4. Install new rectifier on base plate and secure with
a #6-32 truss head screw.
5. Refer to Fig. 29 when reconnecting the wires.
+
A
C
A
C
FIG. 29 RECTIFIER TERMINALS
P1381
Location:
The relays are located inside the hood, the right
relay is just to the right of the contactor in front of the
tank and the left relay is just left of the component
bracket in front of the tank.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Locate the black wire on the left relay center ter-
minal and the blue wire on the right relay center
terminal.
3. Check the voltage across the black and blue wire
with a voltmeter. Connect the brewer to the power
source . The indication must be:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200, 230 or
240 volt models.
4. Disconnect brewer from the power source.
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the wiring
diagrams and check the brewer wiring harness.
5. Remove the white/green wire from the "A" terminal
and white/violet wire from the "B" terminal on the
right relay, the white/brown from the "A" terminal
RELAY (Brewers W/Recovery Booster)
1
2
3
4 5
6
1 2
3 4
5 6
.
MINUTES
BUNN-O-MATIC
P
/N 2620- 12
0 VAC
.
MINUTE
S
BUNN-O-MATIC
P/N 2620-
12
0 VAC
2
2
2
1.5
1
1
1
.5
2.5
MINUTES
MINUTES
MINU
TE
S
P/N 24486-00
00 120 VAC
BU
NN-O-MATIC
3
3
3
4
4
5
5
6
6
7
8
2
2
2
1.5
1
1
1
.5
2.5
MINU
TES
MINUTES
MINUTES
P/N 244
86-0000 1
20 V
AC
BUN
N-O-MATIC
3
3
3
4
4
5
5
6
6
7
8
START
ON
/ WARMER
SELE
CT
OR
REA
DY
READY
ON / WA
RME
R
S
TART
1
1⁄2
g
al
1
ga
l
1⁄
2
gal
SELECT
OR
1
1⁄
2
gal
1 ga
l
1⁄
2
ga
l
BUNN
90 psig max operating pressure
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
(Repl. Screen #23721.0000)
.500 gpm FLOW
FIG. 30 RECOVERY BOOSTER RELAY
P973
RED to Right Receptacle Terminal
BLU/BLKtoTransformer#7
BLKtoLeftReceptacleTerminal
BLU/BLKtoCircuitBreaker
41976 031709