Primary power and trouble alarm power to Control Panel shall be supplied
from two 120 VAC circuits. [Power to the control panel shall be as
indicated.] [A [separate panel] [fused two-pole disconnect switch]
connected ahead of [the main building panel] [the indicated panel] shall be
provided.] Panel shall be equipped with two 20-amp circuit breakers for
each control panel and with key lock. [Panel] [Disconnect switch] shall be
permanently marked "FOAM FIRE PROTECTION SYSTEM".
2.20.3
Emergency Power Supply
Emergency power shall be provided for system operation in the event of
failure of the primary power supply and shall consist of rechargeable
storage battery system. Transfer from normal to emergency power or
restoration from emergency to normal power shall be automatic and shall not
cause transmission of a false alarm.
2.20.3.1
Storage Batteries
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NOTE: Indicate if batteries will be located in a
compartment within the control panel or in a
separate cabinet. Delete last sentence when battery
is not located within the control panel.
**************************************************************************
Storage Batteries shall be sealed, lead-calcium type requiring no
additional water. The batteries shall have ample capacity, with primary
power disconnected, to operate the system for a period of 90 hours.
Following this period of operation via batteries, the batteries shall have
ample capacity to operate alarm indicating devices in the alarm mode for a
minimum period of [15] [_____] minutes. Battery cabinet shall be a
separate [compartment within the control panel] [cabinet]. The battery
compartment or cabinet shall have twice the volume of the batteries.
Batteries shall set on a non-corrosive and non-conductive base or pad.
Batteries in the control panel shall be located at the bottom of the panel.
2.20.3.2
Battery Charger
Battery charger shall be completely automatic, with high/low charging rate,
capable of restoring the batteries from full discharge to full charge
within 24 hours. A separate ammeter shall be provided for indicating rate
of charge. A separate voltmeter shall be provided to indicate the state of
the battery charge. A pilot light indicating when batteries are manually
placed on a high rate of charge shall be provided as part of the unit
assembly if a high rate switch is provided. Charger shall be located in
control panel cabinet.
2.21
ALARM INITIATING DEVICES
2.21.1
Waterflow Pressure Alarm Switch
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NOTE: The adjustable retard switch is similar to
the Potter Model WFSR-F and should be used where
detection of sprinkler waterflow is used to perform
critical functions such as actuating nozzles. This
switch should be piped in the alarm valve trim such
that it cannot be shutoff. The retard feature is
not appropriate for use in preaction or deluge
SECTION 13955A
Page 24
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