Siemens FDBZ492-PR - Operation

P/N A6V10330327_a_en
Siemens Industry, Inc.
Building Technologies Division
2
APPLICATION The FDBZ492-PR duct smoke detectors provide early detection
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 and may be used with
fire alarm systems that shut down complete air handling system
in the event of smoke detection.
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This unit is not intended for open area protection nor should it
be used for early warning detection or to replace a regular fire
detection system.
OPERATION When the Model FDBZ492-PR is operating, 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.
• The FDBZ492-PR supports two sets of Form C alarm
contacts, one Form A alarm contact and one Form C trouble
contact. The trouble contact supervises the presence of the
input power, removal of the detector cover and the removal
of the smoke detector head.
• The FDBZ492-PR contains a green power on LED, red alarm
LED and yellow trouble LED which are visible through the
housing cover.
• The trouble LED is activated when either the housing cover
or smoke detector is removed from the unit.
• When the trouble LED is activated, the power LED turns off.
• A reset/test switch is located on the housing cover and is
used to reset the unit after an alarm and the smoke
condition is cleared. When not in alarm, the reset/test
switch can be used to test that the unit will operate
properly when an alarm condition exists.
The trouble contacts will not operate in the event of a smoke alarm.
The FDBZ492-PR duct detector will operate from various input
voltage sources; namely 24VAC, 24VDC, 115VAC and 230VAC.