System Sensor Intelligent Air Duct Smoke Detector Housing, DH500 specifications Flange

Figure 2A. Speed nut mounting location:

HOLE B

HOLE A

DUCT

WALL

SPEED

NUT

Figure 2B. Installation of foam gaskets over sam- pling tube bushings:

INLET SAMPLING DUCT DETECTOR

MOUNTING TUBE BUSHING HOUSING

SCREWS

O-RINGS	EXHAUST TUBE
	(EXTENSION BUSHING)
	FOAM GASKETS

SCREW HOLES FOR ATTACHING

DETECTOR HOUSING TO DUCT

H0116-00 H0238-00

Table 1. Sampling (Inlet) Tubes
Tube	Outside Duct Width
ST-1.5	1 to 2 ft.	(0.3 to 0.6 m)
ST-3	2 to 4 ft.	(0.6 to 1.2 m)
ST-5	4 to 8 ft.	(1.2 to 2.4 m)
ST-10	8 to 12 ft.	(2.4 to 3.7 m)

Step 4. Install the Inlet Tube

The inlet tube (shown in Figure 3) is identified by a series

Figure 3. Air duct detector inlet sampling tube:

of air inlet holes on the tube. This tube must be purchased separately. Order the correct length, as specified in Table 1, for the width of the duct where it will be installed. The exhaust tube is molded into the base of the duct housing.

The inlet tube is always installed in the right house bush- ing, with the air inlet holes facing into the air flow. To assure proper installation, the tube mounting flange is marked with arrows. Mount the inlet tube so that the arrows point into the air flow. Figure 4 shows the various combinations of tube mounting configurations with respect to air flow.

FLANGE	AIR HOLES	INLET
		TUBE
		END
		PLUG

ARROWS	AIR FLOW DIRECTION	H0108-00
MUST FACE

INTO AIR FLOW

A. Installation for Ducts Less Than 8 Feet Wide

1.If the inlet tube is longer than the width of the air duct, drill a 3/4-inch hole in the duct directly opposite the hole already cut for the inlet tube.

If the inlet tube is shorter than the width of the air duct, install the end cap into the inlet tube (see Figure 3).

2.Slide the inlet tube into the right housing bushing. Position the tube so that the arrows point into the air flow.

3.Secure the tube flange to the housing bushing with the two #6 self-tapping screws.

4.For tubes longer than the width of the air duct, the tube should extend out of the opposite side of the duct. If

there are more than 2 holes in the section of the tube extending out of the duct, select a different tube length using Table 1. Otherwise, trim the end of the tube pro- truding through the duct so that 1 to 2 inches of the tube extends outside the duct. Plug this end with the tube end plug and tape closed any holes in the protruding section of the tube. Be sure to seal the duct when the tube protrudes.

5.Any inlet tube over 3 feet long must be supported on the opposite side of the duct detector housing.

D500-08-00 3 I56-512-07R