Gentex GN-503F — 120 VAC combination photoelectric smoke and electrochemical carbon monoxide alarm with one set of auxiliary Form A/Form C contacts, catalogue number 918-0007-002.
The GN-503 Series is a single- or multiple-station evacuation alarm for dwelling units, hotels and apartments, running on building power with a 9 V alkaline battery for back-up. The F model adds dry contacts so an alarm at the device can drive remote annunciation or signal a protected-premises system; the relay operates on battery back-up as well as on AC.
- 120 VAC, 60 Hz; 0.070 amps operating current on relay models
- Auxiliary relay: one Form A and one Form C, rated 0.5 amps
- Photoelectric smoke sensing at nominal 2.5 percent obscuration
- Horn 3100 Hz nominal, 85 dBA at 10 feet; Temporal 3 smoke, Temporal 4 CO
- DUALINK tandem, maximum 18 devices, no more than 12 smoke alarms
- 6.25" diameter by 1.80" deep; certified to ANSI/UL 217 and UL 2034
Confirm the suffix. The plain GN-503 has no relay, and the GN-503FF has two sets of contacts rated 0.3 amps acting independently for smoke and CO; the harnesses differ.
Documents
FAQ
Is the GN-503F still available?
It is discontinued. The replacement offered for it is the Gentex SCR.
What does the relay do?
The GN-503F has one Form A and one Form C contact rated 0.5 A that activate for smoke and/or CO events, and the contacts operate on battery back-up. The GN-503FF has two sets that act independently for smoke and CO.
How many alarms can be interconnected?
Up to 18 compatible Gentex smoke, heat, CO or combination alarms, with no more than 12 smoke alarms, no more than 125 ft between alarms and 1125 ft from first to last. Gentex alarms cannot interconnect with other manufacturers' alarms.
Can I use a GN-503FF harness?
No. The GN-503F and GN-503FF harnesses are not interchangeable, and the alarm will not work with the wrong harness.
