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 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.]
2.9
ALARM INITIATING AND SUPERVISORY DEVICES
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NOTE: Drawings must indicate and detail the
connection of the waterflow pressure switch, low air
and valve tamper switch to the building fire alarm
system or to the base-wide fire reporting system.
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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2.9.1
Sprinkler Pressure (Waterflow) Alarm Switch
Pressure switch shall include a metal housing with a neoprene diaphragm,
SPDT snap action switches and a 15 mm 1/2 inch NPT male pipe thread. The
switch shall have a maximum service pressure rating of 1207 kPa 175 psi.
There shall be two SPDT (Form C) contacts factory adjusted to operate at 28
to 55 kPa 4 to 8 psi. The switch shall be capable of being mounted in any
position in the alarm line trim piping of the dry pipe valve.
2.9.2
Low Air Pressure Supervisory Switch
The pressure switch shall supervise the air pressure in system and shall be
set to activate at 70 kPa 10 psi above the dry pipe valve trip point
pressure. The switch shall have an adjustable range between 35 kPa 5 psi
and 500 kPa 80 psi. The switch shall have screw terminal connection and
shall be capable of being wired for normally open or normally closed
circuit.
2.9.3
Valve Supervisory (Tamper) Switch
Switch shall be suitable for mounting
to the type of control valve to be
supervised open. The switch shall be
tamper resistant and contain one set
of SPDT (Form C) contacts arranged to
transfer upon removal of the housing
cover or closure of the valve of more
than two rotations of the valve stem.
SECTION 13935A
Page 20
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