The UL listed Intelligent Fire Alarm System. D-TECTRON fire alarm systems can be configured with just a few devices for small size building applications, or networked with many devices to protect a large campus or a high-rise building. Simply add additional peripheral equipment to suit the application. Our advanced technology delivers supports the installers to do complete installation easily through simple steps. The inherent fault-tolerant characteristics of Analog/Address- able Technology boosts the reliability of D-TECTRON fire alarm systems. When combined with D-TECTRON smoke and heat detectors, these systems deliver a level of reliability and dependability for both small to medium size applications.
The DT821 input-output module provides one 24VDC output and one feedback input switch.
The input line is monitored for open line faults and ground faults, and the contact must thus be wired with an end-of-line resistor. The output line is monitored for open line, short circuit faults, ground faults, and external 24VDC power source loss. It is a UL listed device according to UL864 and ULC-S527 for Fire Protective Signaling Systems for indoor use.
When the output is activated or the feedback is switched, the device LED will indicate the event condition by fast blinking.
A return to normal condition will cause the event to disappear and the device LED indicator will return to the red idle condition.
The DT821 is an intelligent addressable module and takes one address on the Signaling Line Circuit (SLC) or Data Communication Link (DCL) of the fire alarm control panel.
| Model | DT821 |
| SLC/DCL Nominal Voltage | 24VDC |
| SLC/DCL Voltage Range | 15 to 28VDC |
| Standby Current | 0.15mA |
| Active Current (SLC/DCL) | 0.26mA |
| External Input Power Supply | 24VDC (nominal) |
| External Input Power Supply | 15.4 to 24.4VDC (range) |
| Active Current (Output) | 80 mA, 0.35pf |
| Output Range (Special Application) | 15.0 to 24.0VDC (Supplied by Model DT106 Auxiliary power output); 20.0 to 25.9VDC (Supplied by Listed 24VDC Regulated power supply). |
| Max. Line Impedance (Input) | 25 Ω |
| Max. Line Impedance (Output) | 1 Ω |
| Max. Impedance for Grounding | 6.6 KΩ |
| Compatible EOLR | DT421 (10KΩ) |
| Operating Temperature | 32˚F to 120˚F (0˚C to 49˚C) |
| Operating Humidity | 0% to 93% RH |
| Mounting | DT800 base |
| Dimension | 120 mm (L) x 120 mm (W) x 45 mm (H) |
| Weight (with backbox) | 9.2 oz (261 g) |
| Wiring Gauge | 12 to 18 AWG |
The D-TECTRON Fire Alarm System complies with the following UL Standards and NFPA 72, International Building Code (IBC),
Fire Alarm System requirements: UL 864, 10th Edition, UL268\UL521\UL1638\UL1971\UL464\UL38
FM Approval Ongoing
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