8 Intelligent Products—DH500 Series Intelligent Air Duct Smoke Detector
Smoke detector models 1551J and 2551J can be used with the DH500
series if the following constraints are observed:
1.
There may be a limit to the number of devices per Signaling Line
Circuit (SLC) that can have their LEDs latched on.
The actual number of devices is determined by the control panel and
its ability to supply LED current. As seen with software Release 1
(Firmware Group M34 or earlier) for the IFC-2020 system, the control
panel stops latching device LEDs on after four device detectors
indicate an alarm.
The maximum number of devices that can be latched in an alarm state
at one time is four. If more than the maximum number of devices are
on the same SLC, do not use the DH500 series for control purposes.
Control for duct applications would need to come directly from the
control panel or by using control modules.
2.
For the IFC-1010 systems with any level of software and for the
IFC-2020 systems that use Release 2 (Firmware Group M35) or
higher and have intelligent detectors and modules with the R4
marking on their label:
●
The LED restriction does not apply.
●
All LEDs may be latched on.
●
Consult the IFC product line programming manuals for
additional information.
3.
When FC-2000 control panels are used with AM-200 modules, they
may ignore the LED restriction by selecting the “FL” full LED
control. Consult the AM-200 manual for further information.
4.
The duct control circuitry (auxiliary relay contacts and 12 volt alarm
output) may operate (change states) if the detector is tested and the
LED is turned off for more than four seconds.
5.
If the time the LED is latched on is less than four seconds, the relay
and remote annunciator control circuitry of the DH500 series will not
operate.
6.
The following systems must use the 1551J with the DH500 series
models when high sensitivity is selected:
●
FC-2000 panels with AM-200 modules
●
IFC-2020 software Release 1 (Firmware Group M34 or earlier)
Programming
Requirements for
Intelligent
System Control
Panels
