[5.4] Sampling Tube Installation for Ducts Greater Than 112 Feet Wide

The sampling tube is identified by a series of air inlet holes on the tube. A plastic tube is included for ducts up to 18in width. All other lengths must be purchased separately. Order the correct length, as specified in Table 1, for width of the duct where it will be installed. It is recommended that the sampling tube length extend at least 23 across the duct width for optimal performance. 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 sampling 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 an arrow. Make sure the sampling tube is mounted so that the arrow points into the air flow (see Figure 4). Figure 5 shows the various combinations of tube mounting configurations with respect to air flow. Mounting the detector housing in a vertical ori- entation is acceptable, provided that the air flows directly into the sampling tube holes as indicated in Figure 4.

Table 1. Sampling tubes recommended for different duct widths:

Outside Duct Width

Sampling Tube Recommended*

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

*Must extend a minimum of 2/3 the duct width

[5.4.1] Installation For Ducts Greater Than 112 Feet But Less Than 8 Feet Wide

1.If the tube is longer than the width of the air duct, drill a 3/4hole in the duct opposite the hole already cut for the sampling tube. Make sure the hole is 1″ to 2″ below the inlet hole on the opposite side of the duct to allow moisture drainage away from the detector. If the tube is shorter than the width of the air duct, install the end cap into the sampling tube as shown in Figure 4. Sampling tubes over 3 ft. long must be supported at the end oppo- site the duct smoke detector.

2.Slide the tube into the housing bushing that meets the air flow first. Position the tube so that the arrow points 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 extending out of the duct, select a different length using Table 1. Otherwise, trim the end of the tube protruding through the duct so that 1to 2of the tube extend out- side the duct. Plug this end with the end cap and tape closed any holes in the protruding section of the tube. Be sure to seal the duct where the tube protrudes.

NOTE: The sampling tube end cap is critical to the proper operation of the duct smoke detector. The end cap is needed to create the proper air flow to the sensor of the duct smoke detector.

Figure 4. Air duct detector sampling tube:

FLANGE

AIR HOLES

SAMPLING

 

 

 

TUBE

 

 

END CAP

ARROW

MUST FACE AIR FLOW DIRECTION INTO AIR FLOW

H0108-02

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

 

DOTS INDICATE POSITION OF

 

 

SAMPLING TUBE HOLES

 

AIR FLOW

 

 

AIR FLOW

 

 

DIRECTION

DIRECTION

 

 

 

 

 

DETECTOR

 

 

DETECTOR

HOUSING

 

 

HOUSING

 

A.

 

B.

SAMPLING

EXHAUST

EXHAUST

SAMPLING

TUBE

TUBE

TUBE

TUBE

 

HORIZONTAL MOUNTING OF HOUSING

 

 

 

 

DETECTOR

 

 

 

HOUSING

 

 

EXHAUST

 

AIR FLOW

 

TUBE

AIR FLOW

DIRECTION

 

 

DIRECTION

DETECTOR

SAMPLING

 

C.

TUBE

D.

HOUSING

VERTICAL MOUNTING OF HOUSING

H0109-01

NOTE: Only metal sampling tubes may be used on orientations C and D.

[5.4.2] Installation For Ducts More Than 8 Feet Wide NOTE: To install sampling 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 accomplished by using the ST-10 sampling tube. If the tube is shorter than the width of the air duct, install the end cap into the sampling tube as shown in Figure 4 and support the end opposite the duct

smoke detector.

Install the sampling tube as follows:

1.Drill a 3/4hole in the duct directly opposite the hole already drilled for the sampling tube. Make sure the hole is 1 to 2below the inlet hole on the opposite side of the duct to allow for moisture drainage.

2.Slide the sampling tube with the flange into the housing bushing that meets the air flow first. Position the tube so that the arrow points into the air flow. Secure the tube flange to the housing bushing with two #6 self-tapping screws.

D200-14-00

3

I56-0084-08R

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System Sensor DH100ACDCLP specifications Sampling tubes recommended for different duct widths, Outside Duct Width

DH100ACDCLP specifications

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