USING THE GENTEX GN-503FF COMBINATION SMOKE AND
CARBON MONOXIDE ALARM ALLOWS THE ABILITY TO:
• Interface with a FACP Panel
• Interface with NAC Circuits
GN-503FF ADDITIONAL PRODUCT INFORMATION
Use brown/yellow wire to tandem interconnect GN-503FF alarms to additional GN-503 Series, S1209 Series and CO1209 Series.
NOTICE: THE GN-503FF IS ONLY CAPABLE OF TANDEM INTERCONNECT WITH GN-503 SERIES, CO1209 SERIES AND
S1209 SERIES.
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 (FF) MAY BE
TANDEM INTERCONNECTED.
C
CA
AU
UT
TIIO
ON
N:: 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 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.
GN-503FF Wiring Diagrams
PLUG
SMOKE/CO
ALARM
BLK
WHT
VIO
VIO
ORN
YEL
HOT
NEUT
POWER
SMOKE ALARM
CONTACTS (FORM A CONTACT)
BRN / YEL
TANDEM
SMOKE FORM C COMMON
SMOKE NORMALLY CLOSED
CO ALARM
CONTACTS (FORM A CONTACT)
PINK
PINK
BLU
GRAY
VIO / YEL
FORM C
ALARM
CONTACTS
SMOKE & CO NORMALLY OPEN
CO FORM C COMMON
CO NORMALLY CLOSED
ELECTRICAL
BOX
SMOKE/CO
ALARM
QUICK DISCONNECT
TYPE PLUG
HOT / BLACK
NEUTRAL / WHITE
TANDEM WIRE
BRN / YEL
SMOKE/CO
ALARM
ELECTRICAL
BOX
ELECTRICAL
BOX
SMOKE/CO
ALARM
