Install the sampling tube as follows

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.

[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 3⁄4-inch hole in the duct opposite the hole already drilled for the sampling tube. Drill the hole 1″ to 2″ below the inlet hole on the opposite side of the duct to allow for moisture drainage away from the detector.

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.

3.From inside the duct, couple the other sections of the

sampling tube to the section already installed using the 1⁄2-inch conduit fittings supplied. Make sure that the holes on both of the air inlet tubes are lined up and fac- ing into the air flow.

4.Trim the end of the tube protruding through the duct so that 1″ to 2″ of the tube extend outside 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 when the tube protrudes.

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

NOTE: Air currents inside the duct may cause excessive vibration, especially when the longer sampling tubes are used. In these cases a 3 inch floor flange (available at most plumbing supply stores) may be used to fasten the sam- pling tube to the other side of the duct. When using the flange/connector mounting technique, drill a 1 to 11⁄4 inch hole where the flange will be used.

[5.4.3] Modifications of 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 a sampling tube that is longer than neces- sary to span the duct width.

Use a 0.193-inch diameter (#10) 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.

NOTE: This procedure should only be used as a temporary fix. It is not intended as a permanent substitute for ordering the correct length tubes.

[5.5] Install The Filters

To install the sampling tube filters, simply push the filters into the sampling and exhaust tube holes as shown in Figure 6. If a metal sampling tube is used, install the filter over the sampling tube.

Figure 6. Sampling tube filter installation:

WARNING

Filters require periodic cleaning or replacement, depend- ing on the amount of dust and dirt accumulated. Visually inspect the filters at least quarterly; inspect them more often if the dust accumulation warrants it. See Section [6] for more information. Replacement filters can be ordered from System Sensor, 3825 Ohio Ave., St. Charles, IL 60174. (Exhaust tube/intake tube filter P/N F36-09-11)

[5.6] Field Wiring

Installation Guidelines

All wiring must be installed in compliance with the National Electrical Code and the local codes having juris- diction. Proper wire gauges should be used. The conduc- tors used to connect smoke detectors to control panels and accessory devices should be color-coded to prevent wiring mistakes. Improper connections can prevent a system from responding properly in the event of a fire.

D200-15-00

I56-0083-07R