20 Intelligent Products—DH500 Series Intelligent Air Duct Smoke Detector
Filters require periodic cleaning or replacement, depending 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.
The filters do not substantially affect smoke behavior even when they are
90% clogged. Quarterly visual inspection is usually enough to determine
if the filters should be replaced because only a high percentage of
contamination affects duct detector performance.
Foam
Gasket
Detector Base
Exhaust Filter
Adapter
Detector Head
Sampling Tube
Filters
Sampling Tube
Mounting Screws
dhfig13
Inlet Sampling Tube
Figure 7: Sampling Tube Filter Installation
1.
Install the cover using the four screws that are fixed in the housing
cover.
2.
Be certain filters are installed as described in the Install the Filters
section of this technical bulletin.
3.
Make sure the cover fits into the base groove and all gaskets are in
their proper positions.
4.
Tighten the four cover screws to 10 in·lb.
Perform Detector
Check
Install the Cover
