Chapter 3 Pre-Installation Gen 3 Site Controller System Manual
Alarm Wiring
3-22 68P80801E30-A 5/1/2002
Alarm Wiring
Various alarms or sensors are installed within the site building. All alarm
wiring terminates at the EAS/EAS2. The electrical contacts for the alarms
must be dry contacts and remain normally closed (open on alarm).
Motorola recommends site installation of the following alarms:
■ smoke detector (120 Vac)
■ intrusion alarm
■ high temperature sensor
■ low temperature sensor
The high temperature sensor should be capable of monitoring temperatures
above 80˚ F (26.7° C). The low temperature sensor should be capable of
monitoring temperatures below 70° F (21.1° C). Temperature sensors should
be mounted to the Telco wiring board at a convenient height to facilitate the
setting and inspection of the trigger points.
Local codes may require an additional contact closure to deactivate the
HVAC system and prevent circulation of smoke in the event of a fire. An
additional smoke detector may be used to provide this contact. It can also be
configured to trigger an external alarm, if required.
If a second alarm closure is used, it must be completely isolated from the
dedicated smoke alarm circuit. Parallel connection of the HVAC controller
through these contacts may damage the HVAC and equipment. This is
because the HVAC low voltage controller typically has 5 Vdc negative
ground, which opposes the -48 Vdc supply.
If specialized automatic fire suppression systems are installed within the
site, water flow alarms or Halon release alarms may also be required. These
systems may also have to be remotely monitored for unattended facilities.
Check your local codes for additional information and requirements.
Note: The use of Halon is now prohibited within the United States of
America. However, if a Halon fire suppression system is currently in
use, there may be alarm requirements that must be satisfied.
To Next Page
Loading...
Need help?
General
