The owner is responsible for maintain-
ing their fire protection system and
devices in proper operating condition.
The installing contractor or sprinkler
manufacturer should be contacted
relative to any questions.
Sprinkler Identification Number
SIN C5153
Approvals
UL & C-UL Listed. FM & NYC Approved.
(The approvals apply only to the service
conditions indicated in the Design
Criteria Section)
Maximum Working Pressure
175 psi (12,1 bar)
Pipe Thread Connection
3/4 inch NPT
Discharge Coefficient
K = 11.2 GPM/psi
1/2
(161,3 LPM/bar
1/2
)
Temperature Ratings
155
°
F/68
°
C, 200
°
F/93
°
C & 286
°
F/121
°
C
Finishes
Sprinkler: Natural Brass
Physical Characteristics
The Model LD Large Drop Storage
Sprinklers utilize a dezincification
resistant (DZR) bronze frame and a 5
mm bulb. The sprinkler frame orifice is
sealed with a gasketed spring plate
(Belleville Seal) consisting of a
beryllium nickel disc spring that is
sealed on both its inside and outside
edges with a Teflon
TM
gasket. The
compression screw is bronze, and the
deflector is brass.
Tyco Fire Products --- www.centralsprinkler.com
451 North Cannon Avenue, Lansdale, Pennsylvania 19446 --- USA
Customer Service/Sales: Tel: (215) 362-0700 / Fax: (215) 362-5385
Technical Services: Tel: (800) 381-9312 / Fax: (800) 791-5500
Model LD
11.2 K-factor
Standard Response
Control Mode - Large Drop
Upright Glass Bulb Automatic Sprinkler
No. 3-6.0
General
Description
The Central Model LD, 11.2 K-factor,
Standard Response, Upright Large
Drop Storage Sprinklers are glass
bulb type automatic sprinklers. They
are intended for use with National Fire
Protection Association and Factory
Mutual Research Corporation "large
drop sprinkler" installation criteria for
the protection of high piled storage.
The Model LD Sprinklers can provide
a higher level of protection than
standard spray sprinklers and, in
some cases, they can provide an
economic advantage by eliminating in-
rack sprinklers.
Applications for the Model LD Sprin-
klers are expanding beyond the
current recognized installation
standards. For information regarding
research fire tests which may be
acceptable to an Authority Having
Jurisdiction (e.g., the protection of
class II commodity in a 40 foot freezer
using a double interlock preaction
system), please contact the Technical
Services Department.
Operation: The glass bulb contains a
fluid which expands when exposed to
heat. When the rated temperature is
reached, the fluid expands sufficiently
to shatter the glass bulb, which then
allows the sprinkler to activate and
flow water.
WARNING
The Model LD Large Drop Storage
Sprinklers described herein must be
installed and maintained in compli-
ance with this document, as well as
with the applicable standards of the
National Fire Protection Association,
in addition to the standards of any
other authorities having jurisdiction.
Failure to do so may impair the
integrity of these devices.
Technical
Data
CENTRAL
LD
2-01
Large Drop
Upright
Sprinklers
OBSOLETE
