M
Mo
od
de
ell
N
Nu
um
mb
be
err
V
Vo
olltta
ag
ge
e
9
9V
VD
DC
C B
Ba
atttte
erry
y
B
Ba
ac
ck
k--U
Up
p
O
On
ne
e ((1
1)) S
Se
ett
F
Fo
orrm
m A
A// F
Fo
orrm
m C
C
R
Re
ella
ay
y C
Co
on
ntta
ac
ctts
s
T
Tw
wo
o ((2
2)) S
Se
etts
s
F
Fo
orrm
m A
A// F
Fo
orrm
m C
C
R
Re
ella
ay
y C
Co
on
ntta
ac
ctts
s
GN-503
120VAC
GN-503F
120VAC
GN-503FF
120VAC
GN-503 AND GN-503F Wiring Diagrams
GN-503 Series Combination Smoke/CO Alarm
GN-503/GN-503F ADDITIONAL PRODUCT INFORMATION
THE GN-503F AND GN-503FF PRODUCT WIRING HARNESS IS NOT INTERCHANGEABLE. THE GN-503F AND GN-503FF
MUST USE PROPER WIRING HARNESS. PRODUCT WILL NOT FUNCTION IF INCORRECT HARNESS IS USED.
DO NOT connect Gentex alarms to other manufacturers’ alarms.
Per NFPA 72, a maximum of 18 compatible smoke, heat, CO and/or combination smoke/CO alarms may be interconnected. No
more than 12 of the 18 can be smoke alarms.
All units connected in tandem MUST get their power from the same circuit, that is, all smoke alarms in tandem must be
controlled by the same fuse or circuit breaker.
NOTICE: PER NFPA 72, A MAXIMUM OF 12 SMOKE/CO ALARMS OF GN-503 WITH THE RELAY OPTION (F) MAY BE
TANDEM INTERCONNECTED.
The GN-503/GN-503F may be tandem interconnected with other Gentex tandem capable smoke alarms, CO alarms or smoke/CO
alarms. To interconnect with Gentex 9000 Series, 7000 Series, 710CS Series, 7109CS Series, GN-200 Series & GN-300 Series
the LEGACY TANDEM WIRE must be used. Refer to installation manual for detailed information.
C
CA
AU
UT
TIIO
ON
N:: RED/YELLOW & BROWN/YELLOW wire to be capped when not in use. This wire is for tandem connection only. Do not
connect to any other circuit.
If a GN-503 Series or CO1209 Series unit is annunciating for a CO event, legacy products that are tandem interconnected will
not activate and will remain silent.
If smoke alarm portion of device goes into alarm, all smoke alarms, CO alarms or combination smoke/CO alarms tandem wired
will sound smoke alarm warning.
When both smoke and CO conditions are present, smoke condition will have priority and alarm will sound smoke annunciation.
PLUG
SMOKE/CO
ALARM
BLK
WHT
RED / YEL
VIO
VIO / BLK
BLU
ORN
YEL
GRAY
GRAY
HOT
NEUT
POWER
TANDEM - LEGACY
ALARM
CONTACTS
ACCESSORY
ALARM
CONTACTS
INTERNAL
JUMPER
BRN / YEL
TANDEM
ELECTRICAL
BOX
SMOKE/CO
ALARM
QUICK DISCONNECT
TYPE PLUG
HOT / BLACK
NEUTRAL / WHITE
TANDEM WIRE
BRN / YEL
SMOKE
ALARM
SMOKE/CO
ALARM
ELECTRICAL
BOX
ELECTRICAL
BOX
TANDEM WIRE
RED / YEL
(LEGACY)
(LEGACY)
