General
Description
The Central Model K25-1 Sprinklers
(Ref. Figure 1) are “Early Suppres-
sion Fast Response Sprinklers” hav-
ing a nominal K-factor of 25.2. They
are suppression mode sprinklers,
and their use is especially advanta-
geous as a means of eliminating the
use of in-rack sprinklers, when pro-
tecting high-piled storage.
The Model K25-1 is primarily de-
signed for use with storage heights
of most encapsulated or non-encap-
sulated common materials including
cartoned unexpanded plastics of up
to 40 ft. (12,2 m) and with ceiling
heights of up to 45 ft. (13,7 m). In ad-
dition, the protection of some stor-
age arrangements of roll paper and
rubber tires can be considered as
well.
The K25-1 provides the system de-
signer with hydraulic and sprinkler
placement options not presently
available to the traditional ESFR
sprinklers having a nominal K-Factor
of 14.0. In particular, the Model
K25-1 has been designed to operate
at substantially lower end head pres-
sures, as compared to ESFR sprin-
klers having a nominal K-Factor of
14.0. This feature offers flexibility
when sizing the system piping, as
well as possibly reducing or eliminat-
ing the need for a system fire pump.
Also, the Model K25-1 permits use
of a maximum deflector-to ceiling dis-
tance of 18 inches (460 mm) versus
14 inches (360 mm); and, a storage
arrangement of up to 40 ft. (12,2 m)
with a ceiling height of up to 45 ft.
(13,7 m) does not require in-rack
sprinklers as do ESFR sprinklers
having a nominal K-Factor of 14.0.
The Model K25-1 Pendent Sprinkler
is also Listed by Underwriters Labo-
ratories Inc. (UL) and by UL for use
in Canada (C-UL) as a “Specific Ap-
plication Early Suppression Fast Re-
sponse Sprinkler” as indicated under
the UL and C-UL Specific Applica-
tion Design Criteria section. The spe-
cific application listing provides for
reduced pressure design for the pro-
tection of certain commodities.
Applications for the Model K25-1
Sprinklers are expanding beyond the
current recognized installation stand-
ards. For information regarding re-
search fire tests which may be ac-
ceptable to an Authority Having
Jurisdiction (e.g., flammable liquids,
exposed plastics, and aerosols),
please contact the Technical Serv-
ices Department.
Operation.
The fusible link assembly
is comprised of two link halves which
are joined together by a thin layer of
solder. When the rated temperature
is reached, the solder melts and the
two link halves separate, which then
allows the sprinkler to activate and
flow water.
WARNINGS
The Model K25-1 Sprinklers de-
scribed herein must be installed and
maintained in compliance with this
document, as well as with the appli-
cable standards of the National Fire
Protection Association, in addition to
the standards of any other authori-
ties having jurisdiction (e.g., Factory
Mutual Research Corporation). Fail-
ure to do so may impair the integrity
of these devices.
The owner is responsible for main-
taining their fire protection system
and devices in proper operating con-
dition. The installing contractor or
sprinkler manufacturer should be
contacted relative to any questions.
Early
Suppression
Fast Response
Pendent
Sprinklers
No. 3-1.1
Model K25-1
Early Suppression
Fast Response Sprinklers
Tyco Fire Products — www.centralsprinkler.com
451 North Cannon Avenue, Lansdale, Pennsylvania 19446
Customer Services/Sales: Tel: (215) 362-0700 / Fax: (215) 362-5385
Technical Services: Tel. (800) 381-9312 / Fax: (800) 791-5500
CENTRAL
K25-1
2-01
OBSOLETE
