control panel power supply, shall operate on 24 Volts dc.
1.4.2
Operational Features
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NOTE: For zoned fire alarm and detection systems,
the systems should be zoned by type of device and by
floor.
The designer will list zones and indicate the exact
wording of the descriptive zone labeling.
Remove item j. below when elevators are not involved.
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The system shall have the following operating features:
a. Monitor electrical supervision of alarm IDC and NAC. Smoke
detectors [shall] [shall not] have combined alarm initiating and power
circuits.
b. Monitor electrical supervision of the primary power (ac) supply,
battery voltage, placement of alarm zone module (card, PC board) within
the control panel, and transmitter tripping circuit integrity.
c. A trouble buzzer and trouble light emitting diode (LED) to activate
upon a single break, open, or ground fault condition which prevents the
required normal operation of the system. The trouble signal shall also
operate upon loss of primary power (ac) supply, low battery voltage,
removal of alarm zone module (card, PC board), and disconnection of the
circuit used for transmitting alarm signals off-premises. A trouble
alarm silence switch shall be provided which will silence the trouble
buzzer, but will not extinguish the trouble indicator LED. Subsequent
trouble and supervisory alarms shall sound the trouble signal until
silenced. After the system returns to normal operating conditions, the
trouble buzzer shall again sound until the silencing switch returns to
normal position, unless automatic trouble reset is provided.
d. A one person test mode. Activating an initiating device in this
mode will activate an alarm for a short period of time, then
automatically reset the alarm, without activating the transmitter
during the entire process.
e. A transmitter disconnect switch to allow testing and maintenance of
the system without activating the transmitter but providing a trouble
signal when disconnected and a restoration signal when reconnected.
f. Evacuation alarm silencing switch which, when activated, will
silence alarm devices, but will not affect the zone indicating LED/LCD
nor the operation of the transmitter. This switch shall be over-ridden
upon activation of a subsequent alarm from an unalarmed zone and the
NAC devices will be activated.
g. Electrical supervision for circuits used for supervisory signal
services (i.e., sprinkler systems, valves, etc.). Supervision shall
detect any open, short, or ground.
h. Confirmation or verification modules for smoke detection initiating
circuits. The modules shall interrupt the transmission of an alarm
SECTION 13850A
Page 12
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