but may be provided on Type B systems. Wherever
more than five circuits are provided on a Type A
system a reserve variable code transmitter shall
also be provided.
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Provide for transmitting a manually selected code to fire stations from
alarm receiving headquarters. Provide a momentary-contact "Start" push
button on the face of the transmitter to set the transmitter into
operation. Provide a separate push button "Restore" switch to permit the
operator to instantly clear the transmitter for another alarm and to
restore all numerical selectors to the unset position. Provide transmitter
capable of the following:
a.
Being set to transmit any combination of codes up to and including
9-9-9-9.
b.
Transmitting from one to four complete rounds of the selected code
number.
c.
Transmitting signal at rates varying from 1/4 second to 3 1/4
second impulses.
2.2
AUDIBLE ALARM
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NOTE: Provide a remote trouble device when the
control panel is located in an area where the
control panel integral trouble signal normally
cannot be heard.
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Provide an audible alarm device arranged to sound whenever an abnormal
condition exists, such as box or alarm circuit trouble, low battery
voltage, or low supervisory current. Provide distinctive trouble
indication for each type of trouble condition and an audible alarm
silencing switch. Operation of the silencing switch shall not delete the
activated trouble indicator. With the switch in the "silence" position,
the audible signal shall re-sound when the trouble condition is corrected.
The control unit shall automatically prevent interference between circuits
to the same degree as the noninterference feature between boxes on the same
circuit. Mount unit in a compact [free-standing floor] [desk-top] cabinet.
Provide voltmeters and millimeters on the face of each unit. Provide a
rigid plastic or metal identification sign which reads "Fire Alarm System
Trouble" at the device.
2.3
SOUNDING DEVICES
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NOTE: In a Type B system a single gong located in
the alarm receiving center is permitted as a common
sounding device for more than one circuit. In a
Type A system a separate sounding device shall be
provided on each box circuit and shall be installed
at the same location as the recording device for
that circuit.
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Provide a 255 mm 10 inch diameter single-stroke [electric] [mechanical]
SECTION 13851N
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