2.6
ALARM CHECK VALVE ASSEMBLY
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NOTE: In lieu of an alarm check valve, the designer
may show a back flow preventer and an accompanying
two inch drain on the sprinkler system side, along
with a vane type waterflow switch.
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Assembly shall include an alarm check valve, standard trim piping, pressure
gauges, bypass, retarding chamber, testing valves, main drain, and other
components as required for a fully operational system.
2.7
WATERFLOW ALARM
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NOTE: Electric waterflow alarms are preferred.
Coordinate type and location of waterflow alarm with
the electrical designer.
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[Electrically operated, exterior-mounted, waterflow alarm bell shall be
provided and installed in accordance with NFPA 13. Waterflow alarm bell
shall be rated 24 VDC and shall be connected to the Fire Alarm Control
Panel(FACP) in accordance with Section [13850A FIRE DETECTION AND ALARM
SYSTEM, DIRECT CURRENT LOOP] [13851A FIRE DETECTION AND ALARM SYSTEM,
ADDRESSABLE]] [Mechanically operated, exterior-mounted, water motor alarm
assembly shall be provided and installed in accordance with NFPA 13. Water
motor alarm assembly shall include a body housing, impeller or pelton
wheel, drive shaft, striker assembly, gong, wall plate and related
components necessary for complete operation. Minimum 20 mm 3/4 inch
galvanized piping shall be provided between the housing and the alarm check
valve. Drain piping from the body housing shall be minimum 25 mm 1 inch
galvanized and shall be arranged to drain to the outside of the building.
Piping shall be galvanized both on the inside and outside surfaces.]
2.8
ALARM INITIATING AND SUPERVISORY DEVICES
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NOTE: Water motor alarms and pressure alarm
switches can be used only with an alarm check valve.
Vane type waterflow indicators can be used with or
without an alarm check valve and are often used for
zoning of the system, e.g., building wings or floors.
To permit testing of each alarm device, the designer
will indicate a separate inspector's test connection
for each device. Coordinate selections and delete
inapplicable devices.
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2.8.1
Sprinkler Waterflow Indicator Switch, Vane Type
Switch shall be vane type with a pipe saddle and cast aluminum housing.
The electro-mechanical device shall include a flexible, low-density
polyethylene paddle conforming to the inside diameter of the fire
protection pipe. The device shall sense water movements and be capable of
detecting a sustained flow of 38 L/min 10 gpm or greater. The device shall
SECTION 13930A
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