Edwards SIGA-SD Duct Detector

The Edwards SIGA-SD is a commercial intelligent duct smoke detector designed for compatible Edwards Signature Series fire alarm systems. It continuously samples air moving through HVAC ductwork to detect smoke before it is distributed throughout the building, helping initiate HVAC shutdown and other programmed fire alarm functions.

The detector combines a Signature Series smoke detector with environmental compensation, electronic addressing, self-diagnostics, maintenance reporting, and an integral Form C alarm relay. Its low-profile SuperDuct housing simplifies installation and maintenance in commercial HVAC systems. This product is intended exclusively for commercial fire alarm installations.

Product Functions

• Detects smoke within HVAC duct systems
• Monitors supply and return air ducts
• Reports alarm conditions to the fire alarm control panel
• Activates an integral Form C auxiliary relay
• Supports HVAC shutdown
• Supports remote testing and reset
• Provides detector maintenance reporting
• Performs continuous self-diagnostics
• Stores operating history in nonvolatile memory

Electrical & System Information

The SIGA-SD operates on compatible Edwards Signature Series Signaling Line Circuits (SLC) and receives operating power directly from the Signature loop. Electronic addressing is assigned automatically by the Signature Loop Controller or through compatible programming software.

An integral Form C alarm relay is provided for HVAC shutdown or auxiliary control functions. The detector also supports compatible remote alarm indicators and remote test/reset stations for convenient maintenance.

Features

• Commercial intelligent duct smoke detector
• Signature Series communication
• Smoke sensing chamber
• Environmental compensation
• Electronic addressing
• Automatic device mapping
• Built-in self-diagnostics
• Maintenance reporting
• Nonvolatile event history
• Form C alarm relay
• Magnetic test capability
• Remote test and reset support
• Clear removable cover
• Low-profile housing

Mounting & Design

The SIGA-SD mounts directly to HVAC ductwork and utilizes separately ordered sampling tubes selected according to duct width. The sampling tube may be installed from either side of the housing and rotated to align correctly with airflow.

The clear removable cover provides convenient access to the detector, terminals, filters, sampling tube, and exhaust tube, simplifying routine inspection and maintenance without removing the housing from the duct.

Protection & Applications

Suitable for:

• HVAC Supply Ducts
• HVAC Return Ducts
• Air Handling Units
• Mechanical Rooms
• Office Buildings
• Hospitals
• Schools
• Industrial Facilities
• Warehouses

A duct smoke detector is intended to monitor smoke movement within HVAC systems and is not a substitute for open-area smoke detection.

Compatibility

Compatible with:

• Edwards Signature Series Fire Alarm Systems
• Signature Loop Controllers
• Signature Data Circuits
• SIGA-PD Smoke Detector
• SIGA-PHD Smoke and Heat Detector
• SIGA-OSD Smoke Detector
• SIGA-OSHD Smoke and Heat Detector
• SD-T Series Sampling Tubes
• SIGA-DTS Remote Test Station
• SIGA-LED Remote Alarm Indicator

Always verify compatibility with the installed Edwards fire alarm control panel, Signature Loop Controller, detector model, sampling tube, duct dimensions, airflow conditions, firmware version, and project requirements before installation.

Technical Specifications

Manufacturer: Edwards

Parent Company: Carrier

Model: SIGA-SD

Series: Signature Series SuperDuct

Product Type: Intelligent Duct Smoke Detector

Detection Method: Smoke Sensing Chamber

Communication: Signature Data Circuit

Addressing: Electronic

Operating Voltage: 15.2–19.95 VDC

Air Velocity Range: 100–4,000 ft/min

Air Pressure Differential: 0.005–1.00 in. Water Column

Smoke Sensitivity: 0.79%–2.46% Obscuration per Foot

Alarm Test Response: Approximately 5 Seconds

Relay Output: One Form C Alarm Relay

Status Indicators: Green Power LED and Red Alarm LED

Wire Size: 14–22 AWG

Operating Temperature: –4°F to 158°F (–20°C to 70°C)

Operating Humidity: 10%–93% RH Non-Condensing

Dimensions: 8.70 × 5.45 × 1.90 in. (221 × 138 × 48 mm)

Sampling Tube: Ordered Separately

Application: Indoor Commercial HVAC and Fire Alarm Systems

Listings: UL Listed, ULC Listed, FM Approved, CSFM Listed, and MEA Approved (application dependent). Verify product labeling and project requirements before installation.

Applications

The Edwards SIGA-SD is designed for commercial fire alarm systems requiring smoke detection within HVAC supply and return ductwork. Typical applications include office buildings, hospitals, schools, hotels, warehouses, industrial facilities, retail centers, mechanical rooms, and other commercial occupancies utilizing compatible Edwards Signature Series fire alarm systems.

Download the Specification sheet in *.pdf format