P/N 315-049708-5
Siemens Industry, Inc.
Building Technologies Division
2
ASSEMBLY This detector has a cover tamper (removal) switch. Care
should be taken when installing the cover. Squarely place the
cover on the unit to aviod possible damage to the switch.
DO NOT SLIDE COVER INTO POSITION.
APPLICATION The AD2 Series duct smoke detectors provide early detec-
tion of smoke and products of combustion present in air
moving through an HVAC duct supply, return, or both. These
devices are designed to prevent the recirculation of smoke in
areas by the air handling system’s fans and blowers. Com-
plete systems may be shut down in the event of smoke
detection.
For the correct installation of a duct smoke unit please refer
to NFPA 72 (National Fire Alarm Code), NFPA 90A (Standard
for Installation of Air Conditioning and Ventilation Systems)
and NFPA 92A (Recommended Practice for Smoke Control
Systems).
OPERATION When the Models AD2-P, AD2-PR and AD2-XHR are operat-
ing, a sample of air is drawn from the duct and passed
through the sampling chamber by means of the input
sampling tube. The air sample passes through the smoke
detector mounted in the duct housing and is exhausted back
into the duct through the outlet tube.
This detector is equipped with cover removal switch (SW1)
that instantly provides a trouble condition upon removal of
the clear cover. For all testing and inspection with the cover
removed, the cover removal switch (designated as SW1 on
PCB) must be manually depressed to simulate normal
operation.
LED Indicator The AD2-P, AD2-PR and AD2-XHR contain an LED indicator
(located on the smoke detector) capable of flashing either one
of three distinct colors: green, yellow, or red. During each flash
interval, the microprocessor based detector checks the
following:
• for smoke in its sensing chamber
• that its critical smoke sensing electronics are operating.
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