![[5.4.3] Modifications of Sampling Tubes](/images/new-backgrounds/50877/508777x1.webp)
3.From inside the duct, couple the other sections of the sampling tube to the section already installed using the 1/2″ 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 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
NOTE: Air currents inside the duct may cause excessive vibration, especially when the longer sampling tubes are used. In these cases a 3″ 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″ to 11⁄4″ 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
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:
![[5.5] Install The Filters](/images/new-backgrounds/50877/508777xi2.webp){kind=small}
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
[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
For signal wiring, (the wiring between interconnected detectors or from detectors to auxiliary devices), it is usually recommended that single conductor wire be no smaller than 18 gauge. The duct smoke detector terminals accommodate wire sizes up to 12 gauge.
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 DH100ACDCLP detectors are designed for easy wiring. The housing provides a terminal strip with clamping plates. Wiring connections are made by stripping about 3/8” of insulation from the end of the wire, sliding the bare end under the plate, and tightening the clamping plate screw.
[5.7] Perform Detector Check
1.Perform STANDBY AND TROUBLE TEST per Section [6.2.1].
2.Perform MAGNET TEST per Section [6.2.2.1]. The RTS451 test of Section [6.2.2.2] may substitute for this requirement.
3.Perform AIR FLOW TEST per Section [6.1.1].
4.Perform SMOKE RESPONSE TEST per Section [6.1.2].
5.Perform SENSITIVITY TEST per Section [6.2.3].
[5.8] Install The Cover
Install the cover using the six screws that are captured in the housing cover. Be certain filters are installed as speci- fied in Section [5.5]. Make sure that the cover fits into the base groove and that all gaskets are in their proper posi- tions. Tighten the six screws.
4 |
