Gentex SCR (918-0032-002) is a 120 VAC combination smoke and carbon monoxide alarm from the Gentex S/C/SC/H Series. It pairs multi-criteria photoelectric smoke sensing with an electrochemical CO sensor and adds one set of Form A/Form C auxiliary relay contacts for remote annunciation.
The SC Series alarms are intended as evacuation devices in dwelling units, including homes, apartments, hospitals, hotels and motels. The 85 dBA piezo horn sounds a Temporal 3 pattern for smoke and a Temporal 4 pattern for CO; when both conditions are present, the smoke signal takes priority. A 9V alkaline battery provides back-up if building power is lost, and the relays continue to operate on battery back-up. Alarms tandem interconnect with other Gentex alarms over the brown/yellow interconnect wire.
Specifications
| Model |
SCR, part number 918-0032-002 |
| Sensing |
Multi-criteria photoelectric smoke and electrochemical CO |
| Operating voltage |
120 VAC, 60 Hz |
| Operating current |
0.055 A at 120 VAC |
| Secondary power |
9V alkaline battery (Duracell MN 1604) |
| Horn |
85 dBA at 10 ft, 3100 Hz nominal |
| Alarm signals |
Temporal 3 for smoke, Temporal 4 for CO |
| Smoke sensitivity |
2.5% obscuration, nominal |
| Auxiliary relay |
1 Form A and 1 Form C (0.5 A) |
| Operating temperature |
40°F to 100°F |
| Size |
5.5 x 5.5 in. overall (5.0 x 5.0 in. at base), 1.75 in. deep |
| Certifications |
ANSI/UL 217 9th Edition and ANSI/UL 2034 |
Features
- Programmable relay operation; relays operate on battery back-up
- 8-hour alarm memory and non-latching (self-restoring) alarm
- Push-button self test and push-button functional test
- Quick-disconnect wiring harness and front-loading battery drawer
- Low or missing battery indicator and 10-year end-of-life indicator
- Fully insect-screened sensing chamber; dust cover for installation
- Mounting hardware adapts to standard junction boxes
Installation notes
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Use the correct harness: the SR, SR220, CR and SCR wiring harness is not interchangeable with other models.
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Interconnect: the brown/yellow tandem wire connects to S, SR, S220, SR220, STRR, SHRR, H, H220, C, CR, SC, SCR and SCRR alarms, and to the Gentex GN-503, CO1209 and S1209 series. Legacy 7100/7103, 9120/9123, GN-200/GN-203, GN-300/GN-303, 710CS/7103CS and 7109CS/7139CS series will not connect.
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Interconnect limit: up to 18 initiating devices, with a maximum of 12 S or SC series smoke alarms.
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Back-up time: if AC power fails, the 9V battery provides proper operation for a minimum of 24 hours.
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Testing: Gentex recommends testing the alarm weekly.
Related models
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SCRR (918-0033-002): the same smoke/CO alarm with two sets of Form A/Form C relay contacts
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SC (918-0031-002): smoke/CO alarm without relay contacts
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CR (918-0036-002): CO-only alarm with one set of Form A/Form C contacts
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SR (917-0071-002): smoke-only alarm with one set of Form A/Form C contacts
Documents
FAQ
Does it have battery back-up?
Yes. A 9V alkaline battery (Duracell MN 1604) provides back-up, and if AC power fails it keeps the alarm operating for a minimum of 24 hours. The relays also operate on battery back-up.
Can it be interconnected with other alarms?
Yes. The brown/yellow tandem wire connects to Gentex S, SR, STRR, SHRR, H, C, CR, SC, SCR and SCRR alarms and to the GN-503, CO1209 and S1209 series, up to 18 initiating devices with a maximum of 12 S or SC series smoke alarms. Legacy series such as 7100/7103, 9120/9123 and GN-300/GN-303 will not connect.
How do occupants tell smoke from CO?
The horn sounds a Temporal 3 pattern for smoke and a Temporal 4 pattern for CO. If both conditions are present, the smoke signal has priority.
What are the relay contacts for?
The SCR has one set of Form A/Form C auxiliary relay contacts for remote annunciation and other remote functions. Relay operation is programmable and the relays operate on battery back-up.
