Tyco F927 Manual

Oh&OFF SPRINKLERS, FLOW CONTROL
PENDENT
MODEL F927 DESIGNER, l/2" (15 mm) ORIFICE, l/2" NPT
The Model F927 On-Off Designer
Sprinklers (Ref. Figure A) are auto-
matic sprinklers of the dual thermal
element, flow control type. In addition
to the heat sensitive frangible bulb that
is used to seal the sprinkler outlet, the
F927 Sprinkler utilizes a heat sensitive
bimetallic disc to automatically open
and close the sprinkler outlet via a pilot
chamber. The bimetallic disc reacts to
an increase or decrease in ambient
temperature, thereby enabling the
F927 to cycle open and close, after the
bulb has operated.
The horizontal orientation of the bime-
tallic disc combined with its location
below the body of the sprinkler is
unique and provides equivalent sensi-
tivity to heat from any direction.
The dual thermal elements of the F927
Sprinkler, combined with the on-off
(flow control) feature, substantially re-
duces the possibility of water damage
due to accidental damage or abuse.
These features make the F927 ideal
for use in water sensitive applications
such as museums, libraries, archives,
computer rooms, and cable tunnels.
The on-off cycling feature of the F927
minimizes fire and related water dam-
age while maintaining fire control.
The F927 Sprinklers are "standard re-
sponse - standard orifice spray sprin-
klers" intended for use in wet-pipe or
single interlock preaction fire sprinkler
systems designed in accordance with
the standard installation rules of NFPA
13. The F927 Sprinklers produce a
Printed in U.S.A.
11-98
MODEL F927
ON- OFF SPRINKLER
HEAT SENSITIVE
METALLIC DISC
WRENCH LUG
HEAT SENSITIVE
RANGIELE BULB
COVER PLATE
FLUSH MOUNT
ESCUTCHEON
INSERT fi
FIGURE A
MODEL F927 ON-OFF PENDENT SPRINKLER
AND OPTIONAL FLUSH MOUNT ESCUTCHEON
Temperature
Classification
Ordinary
Intermediate
Bulb
Bimetallic Disc
Temperature Temperature
Rating Rating
135W57"C l65W74"C
175"F/79"C 212"F/lOO"C
Bulb
Liquid
Color
Orange
Yellow
TABLE A
TEMPERATURE RATINGS
hemispherical water distribution pat-
tern below the deflector.
A more aesthetically pleasing appear-
ance is provided by an optional Flush
Mount Escutcheon (Ref. Figures A and
C-l). The Flush Mount Escutcheon for
the F927 Sprinkler provides up to 1
inch (25,4 mm) of vertical adjustment,
and its separable design allows instal-
lation of the sprinkler and pressure
testing of the fire protection system
prior to ceiling construction and/or ap-
plication of a finish coat to the ceiling.
The removable Flush Mount Escutch-
eon also permits refinishing of a ceiling
surface without having to first shut
down the fire protection system and
TD560