Service (cont.), Wiring diagrams, Right – Bunn G9-2 HD-S User Manual
Page 14: Hig h lo w high hig h lo w low low o n off o n off
14
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.
Test Procedure:
1. Unplug the grinder.
2. Connect a voltmeter across the red/black and white/
green wires of the relay coil. Plug-in the grinder.
Momentarily press the Off/On/Start switch to
“START” (lower) position and release. The indica-
tion must be 120 volts ac for 120V models and 230
volts ac for 230V models for the approximate set-
ting 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 pro-
ceed to #4.
If voltage is not present as described, refer to the
Wiring Diagrams
and check the grinder wiring har-
ness.
4. Remove the white/red and white/blue wires from
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 approxi-
mate 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 operating
properly.
If continuity is not present as described, replace the
relay.
Removal and Replacement
1. Remove all wires from the relay terminals.
2. Remove the 6-32 screw fastening the relay to the
timer bracket.
3. Mount the new relay to the timer bracket and
tighten the screw.
4. Refer to the following illustration when reconnect-
ing the wires.
WHI/RED to
Timer P4-6
WHI/BLU to
Motor L1
RED/BLK to
Timer P4-7
WHI/GRN to
Timer P4-3
DIS
PE
NS
E T
IM
E (S
ec
on
ds
)
DIS
PL
AY
Incre
as
e
De
cre
as
e
Re
ad
ou
t w
ill
be
dis
pla
ye
d f
or
5 m
inu
tes
.
Tim
er
ca
n o
nly
be
ad
jus
ted
wh
ile
re
ad
ou
t is
dis
pla
ye
d.
+
WARNING
HAZARD
OUS VO
LTAG
E
UN
PL
UG
G
RIN
DE
R
BE
FO
RE
R
EM
OV
IN
G
RIGHT
DIS
PE
NS
E T
IM
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
LEFT
HIGH
UN
PL
UG
G
RIN
DE
R
BE
FO
RE
R
EM
OV
IN
G
WARNING
HAZAR
DO
US VOLTAG
E
HIG
H
LO
W
HIGH
HIG
H
LO
W
LOW
LOW
O N
OFF
O N
OFF
P609
P610
Grinders with Analog Timer
Grinders with Digital Timer
10218 051603