Bunn G9-2 HD Manuel D’Utilisation
1 4
SERVICE (cont.)
Relay
Location:
The relay is located on the timer bracket in the
grinder base. The bracket can be removed by loosen-
ing the two 8-32 slotted head screws beneath the timer
dial.
ing the two 8-32 slotted head screws beneath the timer
dial.
Test Procedure:
1.
1.
Unplug the grinder.
2.
Check the voltage across the red/black and
white/green wires of the relay coil with a volt-
meter when the Off/On/Start switch is pressed
to the “START” (lower) position and released.
Plug-in the grinder. The indication must be 120
volts ac for the approximate setting on the timer.
white/green wires of the relay coil with a volt-
meter when the Off/On/Start switch is pressed
to the “START” (lower) position and released.
Plug-in the grinder. The indication must be 120
volts ac for the approximate setting on the timer.
3.
Unplug the grinder.
If voltage is present as described, reconnect the
red/black and white/green wires to the relay coil, and
proceed to #4.
proceed to #4.
If voltage is not present as described, refer to
the
Wiring Diagrams and check the grinder wiring
harness.
4.
Remove the white/red and white/blue wires from
the relay contacts.
the relay contacts.
5.
Check for continuity across the relay contacts
when the Off/On/Start switch is pressed to the
“START” (lower) position and released. Plug-in
the grinder. Continuity must be present for the
approximate setting on the timer.
when the Off/On/Start switch is pressed to the
“START” (lower) position and released. Plug-in
the grinder. Continuity must be present for the
approximate setting on the timer.
6.
Unplug the grinder.
If continuity is present as described, reconnect
the white/red and white/blue wires, the relay is oper-
ating properly.
ating properly.
If continuity is not present as described, replace
the relay.
Removal and Replacement
1.
1.
Remove all wires from the relay terminals.
2.
Remove the 6-32 screw fastening the relay to
the timer bracket.
the timer bracket.
3.
Mount the new relay to the timer bracket and
tighten the screw.
tighten the screw.
4.
Refer to the following illustration when recon-
necting the wires.
necting the wires.
WHI/RED to
Timer P4-6
Timer P4-6
WHI/BLU to
Motor L1
Motor L1
RED/BLK to
Timer P4-7
Timer P4-7
WHI/GRN to
Timer P4-3
Timer P4-3
DI
SP
EN
SE
TI
ME
(S
ec
on
ds
)
DI
SP
LA
Y
Inc
rea
se
De
cre
as
e
Readout will be displayed for 5 minutes.
Timer can only be adjusted
while readout is displayed.
while readout is displayed.
+
W
AR
NIN
G
HA
ZA
RD
OU
S V
OL
TA
GE
UN
PL
UG
G
RI
ND
ER
BE
FO
RE
R
EM
OV
IN
G
RI
GH
T
DI
SP
EN
SE
TIM
E
(S
EC
ON
DS
)
3.2
6
10
15
20
25
30
32
3.2
.4
.4
1
1
2
2
3
3
4
6
10
15
20
25
30
32
4
LE
FT
HI
GH
UN
PL
UG
G
RI
ND
ER
BE
FO
RE
R
EM
OV
IN
G
W
AR
NIN
G
HA
ZA
RD
OU
S V
OL
TA
GE
HIG
H
LO
W
HI
GH
HIG
H
LO
W
LO
W
LO
W
O N
OFF
O N
OFF
P609
P610
Grinders with Analog Timer
Grinders with Digital Timer