System Sensor DH100ACDCP Install the inlet tube as follows, Modifications of Inlet Sampling Tubes

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. Make sure the hole is 1 to 2″ below the inlet hole on the opposite side of the duct to allow for moisture drainage.

2.Slide the inlet tube with the flange into the housing bush- ing that meets the air flow first. Position the tube so that the arrows point 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 inlet 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 facing 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 plug 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 inlet 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 sampling tube to the other side of the duct. When using the flange/connector mounting technique, drill a 1-inch to 11⁄4-inch hole where the flange will be used.

[5.4.3] Modifications 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 appropriate 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 filters over the tube ends.

Figure 6. Sampling tube filter installation:

A78-2106-01

CAUTION

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 F36-09-00)

[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.

For signal wiring, (the wiring between interconnected detectors or from detectors to auxiliary devices), it is usu- ally recommended that single conductor wire be no smaller than 18 gauge. The duct smoke detector terminals accom- modate wire sizes up to 12 gauge. The last foot of conduit should be flexible conduit (available in electrical supply houses), which facilitates easier installation and puts less strain on the conduit holes in the housing. Solid conduit connections may be used if desired.

Smoke detectors and alarm system control panels have specifications for allowable loop resistance. Consult the control panel manufacturer’s specifications for the total loop resistance allowed for the particular model control panel being used before wiring the detector loop.

Wiring Instructions

The DH100ACDCP detectors are designed for easy wiring. The housing provides a terminal strip with clamping plates.

D100-68-00 4 I56-1147-12R