contain a retard device adjustable from 0 to 90 seconds to reduce the
possibility of false alarms caused by transient flow surges. The switch
shall be tamper resistant and contain two SPDT (Form C) contacts arranged
to transfer upon removal of the housing cover, and shall be equipped with a
silicone rubber gasket to assure positive water seal and a dustproof cover
and gasket to seal the mechanism from dirt and moisture.
2.8.2
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 alarm check valve.
2.8.3
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.
2.9
FIRE DEPARTMENT CONNECTION
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NOTE: The designer will coordinate the desired
location of the fire department connection with and
verify the type of threads used by the fire
department serving the building where the sprinkler
system is being installed.
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Fire department connection shall be [projecting] [flush] type with cast
brass body, matching wall escutcheon lettered "Auto Spkr" with a [polished
brass] [chromium plated] finish. The connection shall have two inlets with
individual self-closing clappers, caps with drip drains and chains. Female
inlets shall have 65 mm 2-1/2 inch diameter American National Fire Hose
Connection Screw Threads (NH) per [NFPA 1963] [_____].
2.10
SPRINKLERS
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NOTE: The designer will indicate on the contract
drawings the type of sprinkler heads for each area
if more than one type of sprinklers is to be
provided. Delete sprinkler types from this
paragraph that are not intended for use in the
system(s) used in the contract.
Areas that are classified as light hazard will be
equipped with quick response sprinklers.
Residential areas will be equipped with residential
sprinklers.
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Sprinklers with internal O-rings shall not be used. Sprinklers shall be
used in accordance with their listed coverage limitations. Temperature
classification shall be [ordinary] [intermediate] [_____] [as indicated].
SECTION 13930A
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