RAPID RESPONSE Series LFII Residential Sprinklers
4.9 K-factor Flat-Plate Concealed Pendent
Wet Pipe and Dry Pipe Systems
Page 1 of 6
FEBRUARY 2014
TFP443
IMPORTANT
Always refer to Technical Data
Sheet TFP700 for the “INSTALLER
WARNING” that provides cautions
with respect to handling and instal-
lation of sprinkler systems and com-
ponents. Improper handling and in-
stallation can permanently damage
a sprinkler system or its compo-
nents and cause the sprinkler to fail
to operate in a fire situation or cause
it to operate prematurely.
General
Description
The TYCO RAPID RESPONSE
Series
LFII Residential Flat-Plate Concealed
Pendent Sprinklers (TY2524) are decora-
tive, fast response, fusible solder sprin-
klers designed for use in residential oc-
cupancies such as homes, apartments,
dormitories, and hotels.
The Cover Plate/Retainer Assembly con-
ceals the sprinkler operating compo-
nents above the ceiling. The flat profile
of the Cover Plate provides the optimum
aesthetically appealing sprinkler design.
Additionally, the concealed design of the
Series LFII Residential Flat-Plate Con-
cealed Pendent Sprinklers provides 1/2
inch (12,7 mm) vertical adjustment. This
adjustment provides a measure of flex-
ibility when cutting fixed sprinkler drops.
The Series LFII Residential Flat-Plate
Concealed Pendent Sprinklers are in-
tended for use in the following systems:
• wet and dry pipe residential sprin-
kler systems for one- and two-fam-
ily dwellings and mobile homes per
NFPA 13D
• wet and dry pipe residential sprin-
kler systems for residential occu-
pancies up to and including four sto-
ries in height per NFPA 13R
• wet and dry pipe sprinkler systems
for the residential portions of any
occupancy per NFPA 13
The Series LFII Residential Sprinklers
have been designed with heat sensitiv-
ity and water distribution characteristics
proven to help in the control of residen-
tial fires and to improve the chance for
occupants to escape or be evacuated.
The Series LFII Residential Flat-Plate
Concealed Pendent Sprinklers are
shipped with a Disposable Protective
Cap. The Protective Cap protects the
sprinkler during ceiling installation or
finish. After ceiling installation is com-
plete, the Protective Cap is removed
and the Cover Plate/Retainer Assem-
bly is installed. Removing the Protec-
tive Cap is required for proper sprinkler
performance.
Dry Pipe System Application
The Series LFII Residential Flat-Plate
Concealed Pendent Sprinkler offers a
laboratory approved option for design-
ing dry pipe residential sprinkler sys-
tems, whereas, most residential sprin-
klers are laboratory approved for wet
systems only.
Through extensive testing, it has been
determined that the number of design
sprinklers (hydraulic design area) for the
Series LFII Residential Flat-Plate Con-
cealed Sprinklers (TY2524) need not be
increased over the number of design
sprinklers (hydraulic design area) speci-
fied for wet pipe sprinkler systems, as
is customary for density/area sprinkler
systems designed per NFPA 13, 13D,
or 13R.
Consequently, the Series LFII Residen-
tial Flat-Plate Concealed Sprinklers
(TY2524) offer the features of non-wa-
ter filled pipe in addition to not having to
increase the number of design sprinklers
(hydraulic design area) for systems de-
signed to NFPA 13, 13D, or 13R.
NOTICE
The Series LFII Residential Flat-Plate
Concealed Pendent Sprinklers (TY2524)
described herein must be installed and
maintained in compliance with this doc-
ument and the applicable standards of
the National Fire Protection Association,
in addition to the standards of any au-
thorities having jurisdiction. Failure to
do so may impair the performance of
these devices.
The owner is responsible for maintaining
their fire protection system and devic-
es in proper operating condition. Con-
tact the installing contractor or sprinkler
manufacturer with any questions.
Sprinkler
Identification
Number (SIN)
TY2524
