Installation for Ducts More Than 8 Feet Wide

Figure 4. Tube mounting configurations with varying air flow direction and orientation of detector housing. Vertical as well as horizontal mounting is acceptable.

DOTS INDICATE POSITION OF

SAMPLING TUBE HOLES

	AIR FLOW	AIR FLOW
		DIRECTION
	DIRECTION

DETECTOR HOUSING

INLET

TUBE

DETECTOR

HOUSING

A.		B.
EXHAUST	EXHAUST	INLET
TUBE	TUBE	TUBE

HORIZONTAL MOUNTING OF HOUSING

EXHAUST
TUBE	DETECTOR
	DETECTOR
	HOUSING

	EXHAUST
AIR FLOW	TUBE		AIR FLOW
AIR FLOW			AIR FLOW
DIRECTION			DIRECTION
	INLET	INLET
DETECTOR	TUBE	TUBE	D.	H0109-00
HOUSING	C.		D.	H0109-00

VERTICAL MOUNTING OF HOUSING

WARNING

In no case should more than 2 air inlet holes be cut off the tube. There must be a minimum of 10 holes in the tube exposed to the air stream.

B. Installation for Ducts More Than 8 Feet Wide

NOTE: To install inlet tubes in ducts more than 8 feet wide, work must be performed inside the air duct. Sampling of air in ducts wider than 8 feet is accom- plished by using the ST-10 inlet sampling tube.

Install the inlet tube as follows:

1.Drill a 3/4-inch hole in the duct directly opposite the hole already drilled for the inlet tube.

2.Slide the inlet tube with the flange into the right housing bushing. Position the tube so that the arrows point into the air flow. Secure the tube flange to the housing bush- ing with the two #6 self-tapping screws.

3.From inside the duct, couple the other section of the inlet tube to the section already installed using the 1/2- inch conduit fitting supplied. Make sure the holes on both of the air inlet tubes are lined up facing the air flow.

4.Trim the end of the tube protruding through the duct so that 1 to 2 inches of the tube extends outside the duct. Plug this end with the tube end cap and tape closed any holes in the protruding section of the tube. Be sure to seal the duct when the tube protrudes.

5.Any tube (over 3 feet long) that doesn’t protrude through the duct (on the side opposite the housing) must be sup- ported by other means.

NOTE: An alternate method to using the ST-10 is to use two ST-5 inlet tubes. Remove the flange from one of the tubes and install as described above. After the installation, use electrician’s tape to close off some of the sampling holes so that there are a total of 12 holes spaced as evenly as possible across the width of the duct.

NOTE: Air currents inside the duct may cause excessive vibration. This vibration can slowly open the seal around the tube and permit air to escape. To prevent this from occurring, a 3-inch floor flange, available at most plumbing supply houses, may be used. This flange/connector mounting technique makes the initial installation easier because a 1- inch to 1-1/4-inch hole may be drilled where the flange/connector will be used. It is easier to push the inlet tube through the larger hole.

Modification of Inlet Sampling Tubes

There may be applications where duct widths are not what is specified for the installation. In such cases, it is permis- sible to modify an inlet sampling tube that is longer than necessary to span the duct width.

Use a 0.193-inch diameter (#11) drill and add the appro- priate number of holes so that the total number of holes exposed to the air flow in the duct is 10 to 12. Space the additional holes as evenly as possible over the length of the tube.

D500-08-00

I56-512-07R

DH500, Intelligent Air Duct Smoke Detector Housing specifications

The System Sensor DH500 is an advanced intelligent air duct smoke detector housing designed to effectively monitor and detect smoke within HVAC ducts. As smoke detection in air handling systems is critical to ensuring the safety of occupants, the DH500 utilizes cutting-edge technology to provide reliable performance and early warning capabilities.

One of the main features of the DH500 is its intelligent detection capabilities. The device employs photoelectric sensing technology, which is well-suited for detecting the slow-burning fires that often generate more smoke than flames. This technology allows for prompt detection of smoke particles while minimizing false alarms caused by dust or other non-threatening particles. The DH500 is designed to operate efficiently in various environments, making it ideal for commercial and industrial settings.

The DH500 is equipped with a low-profile design, providing ease of installation and a more aesthetically pleasing appearance that blends seamlessly with existing ductwork. The housing is made from durable materials, ensuring long-lasting performance and resilience against environmental factors.

Another significant characteristic of the DH500 is its ability to accommodate multiple detectors. The housing can integrate with a variety of smoke detectors, allowing for installation flexibility depending on specific needs and applications. This modularity is particularly advantageous in large buildings where multiple air ducts may need simultaneous monitoring.

The device also incorporates advanced communication options, allowing for compatibility with various fire alarm control panels. This enables real-time monitoring and integration into broader building safety systems, enhancing overall emergency response capabilities. Moreover, the DH500 features an intuitive status indicator that provides visual confirmation of operational performance, making maintenance and monitoring straightforward.

In terms of maintenance, the DH500 is designed for easy access to the smoke detectors, ensuring they can be inspected and cleaned regularly, optimizing their efficiency and longevity. Regular maintenance plays a crucial role in the reliability of smoke detection systems, and the DH500's user-friendly design supports this essential function.

In summary, the System Sensor DH500 intelligent air duct smoke detector housing stands out for its intelligent detection technology, low-profile design, compatibility with multiple detectors, and advanced communication capabilities. Its durable construction and focus on ease of maintenance further enhance its appeal for commercial and industrial applications, making it a reliable choice for effective smoke detection in air handling systems.