System Sensor D100-67-00, I56-1148-04 specifications Outside Duct Width, Inlet Tube Required

[5.3] Secure The Detector Housing To The Duct

Slide the foam gaskets over the tube bushings as shown in Figure 3. Use the two machine screws to screw the detector housing to the duct.

CAUTION: Do not overtighten the screws.

Figure 3. Installation of foam gaskets over sampling tube bushings:

A78-2045-00

[5.4] Sampling Tube Installation of Ducts Greater Than 11/2 Feet Wide

The sampling tube is identified by a series of air inlet holes on the tube. One telescoping tube is included for ducts up to 18″ in width. All other lengths must be purchased sepa- rately. Order the correct length, as specified in Table 1, for width of the duct where it will be installed. The exhaust tube is molded onto the base of the duct housing, and the A2440-00 Exhaust Tube Extension is available as an acces- sory in those cases where the molded exhaust port does not extend at least 2 inches into the duct.

The inlet tube is always installed with the air inlet holes facing into the air flow. To assist proper installation, the tube’s mounting flange is marked with arrows. Make sure the inlet tube is mounted so that the arrows point into the air flow (see Figure 4). Figure 5 shows the various combi- nations of tube mounting configurations with respect to air flow. Mounting the detector housing in a vertical orienta- tion is acceptable, provided that the air flows directly into the sampling tube holes as indicated in Figure 4.

Table 1. Inlet tubes required for different duct

widths:
Outside Duct Width	Inlet Tube Required
1 to 2 ft.	ST-1.5
2 to 4 ft.	ST-3
4 to 8 ft.	ST-5
8 to 12 ft.	ST-10

[5.4.1] Installation For Ducts Greater Than 1 1/2 Feet But Less Than 8 Feet Wide

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

the inlet tube. Make sure the hole is 1″ to 2″ below the in- let hole on the opposite side of the duct to allow for mois- ture drainage. If the tube is shorter than the width of the air duct, install the end plug into the inlet tube as shown in Figure 4. Sampling tubes over 3 ft. long must be supported at the end opposite the duct detector.

2.Slide the tube into the housing bushing that meets the air flow first. Position the tube so that the arrows point into the air flow.

3.Secure the tube flange to the housing bushing with 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 ex- tending out of the duct, select a different length using

Table 1. Otherwise, trim the end of the tube protruding through the duct so that 1″ to 2″ of the tube extend out-

side the duct. Plug this end with the end plug and tape closed any holes in the protruding section of the tube. Be sure to seal the duct when the tube protrudes.

Figure 4. Air duct detector inlet sampling tube:

AIR HOLES	INLET
FLANGE
	TUBE
	END
	PLUG
ARROWS	AIR FLOW DIRECTION
MUST FACE
INTO AIR FLOW
	A78-2047-00

Figure 5. Tube mounting configurations with varying air flow direction:

DOTS INDICATE POSITION OF

SAMPLING TUBE HOLES

AIR FLOW			AIR FLOW
			DIRECTION
DIRECTION
DUCT			DUCT
			DETECTOR
DETECTOR
			HOUSING
HOUSING
	A.		B.
INLET	EXHAUST	EXHAUST	INLET
TUBE	TUBE	TUBE	TUBE
EXHAUST	INLET	AIR FLOW
		DIRECTION
TUBE	TUBE
DUCT			DUCT
			DETECTOR
DETECTOR
			HOUSING
HOUSING
	C.		D.
AIR FLOW		EXHAUST	INLET
DIRECTION		TUBE	TUBE

NOTE: Orientations C and D apply only to metal sampling tubes.

A78-1812-08

D100-67-00 3 I56-1148-04