G N - 5 0 3
S E R I E S
551-0073-04
Important Notice:
These materials have been prepared by Gentex Corporation ("Gentex") for informational purposes only,
are necessarily summary, and are not purported to serve as legal advice and should not be used as
such. Gentex makes no representations and warranties, express or implied, that these materials are
complete and accurate, up-to-date, or in compliance with all relevant local, state and federal laws, regu-
lations and rules. The materials do not address all legal considerations as there is inevitable uncertainty
regarding interpretation of laws, regulations and rules and the application of such laws,
regulations and rules to particular fact patterns. Each person's activities can differently affect the
obligations that exist under applicable laws, regulations or rules. Therefore, these materials should be
used only for informational purposes and should not be used as a substitute for seeking professional
legal advice. Gentex will not be responsible for any action or failure to act in reliance upon the
information contained in this material.
A
Arrc
ch
hiitte
ec
ctt &
& E
En
ng
giin
ne
ee
erriin
ng
g S
Sp
pe
ec
ciiffiic
ca
attiio
on
ns
s
The combination photoelectric smoke and carbon monoxide alarm shall be a Gentex Model GN-503/GN-503F/GN-503FF or approved
equal which shall provide at least the following features and functions:
1. Nominal smoke sensitivity shall be 2.5%.
2. The smoke alarm portion of device shall utilize an infrared LED sensing circuit which pulses in 4 to 5 second intervals when
subjected to smoke. After 2 consecutive pulses in smoke, the alarm shall activate.
3. The CO alarm shall utilize an electrochemical sensing element with a minimum 5-year life.
4. The carbon monoxide alarm portion of device is adjusted not to detect CO levels below 30 PPM and will not alarm when exposed
to constant levels of 30 PPM for 30 days. Per ANSI/UL 2034 requirements, the device will alarm at the following levels: 70 PPM
CO between 1 to 4 hours, but not less than 1 hour. 150 PPM CO between 10 to 50 minutes. 400 PPM between 4 to 15 minutes.
5. The GN-503 Series device shall have a Duracelll
®
MN 1604 9VDC alkaline battery as a back-up in the event building power is lost.
6. The 9VDC battery impedance shall be verified by the circuit of the smoke/CO alarm.
7. The alarm shall provide an indicator when the battery is low in power, high impedance or is missing.
8. The CO alarm will provide an audible indicator of 3 quick chirps every 30 seconds at end of life of CO sensor.
9. The sensing chamber shall be fully protected to prevent entrance of small insects, thus reducing the probability of false alarms.
10. The alarm shall include a solid state red color LED that will indicate presence of CO at the unit.
11. The alarm shall include a solid state piezo alarm rated at 85dBA at 10ft.
12. A visual LED monitor (condition indicator) shall slow pulse in normal operation and rapid pulse in alarm (red color)
13. An easily accessible test button shall be provided. Push down on button for 5 seconds causing smoke/CO alarm to activate.
If device does not go into alarm, the device is not working properly.
14. The device shall have tandem interconnect capability of up to 12 smoke/CO alarms.
15. The GN-503 and GN-503F alarm shall have the capability to tandem interconnect with all Gentex tandem capable smoke
alarms, CO alarms or combination smoke/CO alarms, including 7000/7003 Series, 9000/9003 Series, 710CS/713CS Series,
7109CS/7139CS Series, GN-200/GN-300 Series, S1209 Series and CO1209 Series.
15. The GN-503FF alarm shall have the capability to tandem interconnect with the following Gentex alarms, CO alarms or
combination smoke/CO alarms: GN-503 Series, S1209 Series and CO1209 Series.
16. The manufacturer shall provide models with the optional feature of auxiliary Form A/Form C relay contacts for initiating remote
functions and annunciation and a relay option that is capable of activation by tandem interconnect wire.
17. The combination smoke/CO alarm shall be non-latching (self-restoring).
18. Unit must be ANSI/UL 217 and ANSI/UL 2034 listed for both wall and ceiling mounting.
19. Unit shall be listed by Underwriters Laboratories and California State Fire Marshal (CSFM).
All equipment shall be completely factory assembled, wired and tested, and the contractor shall be prepared to submit a certified letter testifying to
this condition. Alarms which do not meet all of the requirements of this specification will not be considered.
For complete product specifications, refer to product installation manual.
24 units per carton
24 pounds per carton
Electrical Specifications
Operating Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
120VAC, 60Hz
Operating Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.045 amps
Operating Current (Relay Options) . . . . . . . . . . . . . . . . . . . . . .
.070 amps
Operating Ambient Temp Range . . . . . . . . . . . . . . . . . . . . . . . .
40°F to 100°F (4.4°C-38°C)
Alarm Horn Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
85dBA at 10 feet (3.048 m)
Auxiliary Relay (GN-503F) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Form A & 1 Form C (0.5 amp)
Auxiliary Relay (GN-503FF) . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Form A & 2 Form C (0.3 amp)
Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diameter at base: 5.75 in. (14.605 cm)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overall diameter 6.25 in. (16.51 cm)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Depth: 1.8 in. (4.572 cm)
Secondary Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alkaline 9VDC battery (Duracell
®
MN 1604)
CO Sensing Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrochemical Cell
