Relay - Bunn Dual Operating & Service Manual

SERVICE (cont.)
RELAY (Brewers W/Recovery Booster)
NOTE - Electro/mechanically controlled brewers have
two relays and the electronically controlled have one.
FIG. 24 RELAY
Location:
Electro/mechanically Controlled Brewers
The relays are located inside the hood, the right
relay just to the right of the contactor in front of the
tank and left relay is just left of the component bracket
in front of the tank.
Electronically Controlled Brewers
The relay is located inside the hood just to the right
of the contactor in front of the tank.
Test Procedures:
Electro/mechanically Controlled Brewers.
1. Disconnect the brewer from the power source.
2. Locate the black wire on the left center relay
terminal and the blue wire on the right center relay
terminal.
3. With a voltmeter, check the voltage across the
black and blue wire. Connect the brewer to the
power source . The indication must be:
l
ga
1 1⁄2
l
1 ga
l
ga
1⁄2
Y
A D
R E
O R
C T
LE
S E
R
M E
A R
/ W
O N
T
A R
S T
l
ga
1 1⁄2
l
1 ga
l
ga
1⁄2
A R T
S T
M E R
A R
/ W
O N
O R
C T
S E LE
Y
A D
R E
ER
T W AT
H O
TI O N
C AU
!
P796
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 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 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 wire from the "A"
terminal and white/red wire from "B" terminal on
the left relay.
6. Check for continuity across the "A" and "B" termi-
nals of each relay.
If continuity is present as described, reconnect the
white/green wire and white/violet wire to the right relay
or the white/brown wire and the white/red wire to the
left relay and proceed to #7.
If continuity is not present as described, replace the
relay(s).
7. Remove the two blue wires from terminal 5 and the
red wire from terminal 7 on the right relay, the
black wires from terminal 5 and the red wire from
terminal 7 on the left relay.
8. Check for continuity across terminals 5 and 7 of
each relay by manually closing relay contact. Con-
tinuity must not be present when contact is re-
leased.
If continuity is present as described, reconnect blue
wires to terminal 5 on the right relay, the black wires
to terminal 5 on the left relay and the red wire to left and
right terminal 7, the relays are operating properly.
If continuity is not present as described, replace the
relay(s).
Electronically Controlled Brewers
1. Disconnect brewer from the power source.
2. Locate the gray wire on terminal 7 and the white/
green wire on terminal B of the relay.
Page 34
27040 032201