TFP442
Page 2 of 6
Technical
Data
Approvals
UL and C-UL Listed
NYC Approved under MEA 44-03-E-2NSF
Certified to all requirements of
NSF/ANSI 61
The TYCO RAPID RESPONSE Series LFII
Residential Concealed Pendent Sprinklers
are Listed only when installed with LFII Con-
cealed Cover Plates having factory-applied
finishes.
Sprinklers and Cover Plates are separately
ordered. See the Ordering Procedure
section for more information.
Maximum Working Pressure
175 psi (12,1 bar)
Discharge Coefficient
K=4.9 GPM/psi
½
(70,6 LPM/bar
½
)
Temperature Rating
Ordinary
160°F (71°C) Sprinkler/
139°F (59°C) Cover Plate
NOTE:
Maximum Ambient Ceiling Temperature for the
ordinary temperature configuration is 100°F (38°C)
Intermediate
*
212
°
F (100
°
C) Sprinkler/
165
°
F (74
°
C) Cover Plate
*For wet pipe systems only
NOTE:
Maximum Ambient Ceiling Temperature for the
intermediate temperature configuration is 150°F (65°C)
Vertical Adjustment
1/2 in. (12,7 mm)
Finishes
See the Ordering Procedure section
Physical Characteristics
Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Brass
Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Bronze
Saddle . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Brass
Sealing Assembly . .Beryllium Nickel w/TEFLON
Soldered Link Halves . . . . . . . . . . . . . . . . Nickel
Lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Bronze
Compression Screw . . . . . . . . . . . . . . . . . .Brass
Deflector . . . . . . . . . . . . . . . . . . Copper or Brass
Guide Pin Housing . . . . . . . . . . . . . . . . . .Bronze
Guide Pins . . . . . . . . . Stainless Steel or Bronze
Support Cup . . . . . . . . . . . . . . . . . . . . . . . Steel
Cover Plate . . . . . . . . . . . . . . . . .Copper/Brass**
Retainer . . . . . . . . . . . . . . . . . . . . . . . . . Copper
Cover Plate Ejection Spring . . . . Stainless Steel
** Brass Cover Plate is offered for Intermediate Tem-
perature 165°F (74°C) only.
Operation
When exposed to heat from a fire, the
Cover Plate, which is normally soldered
to the Retainer at three points, falls
away to expose the sprinkler assembly.
At this point the Deflector supported by
the Arms drops down to its operated
position. The fusible link of the sprin-
kler assembly is comprised of two link
halves that are soldered together with
a thin layer of solder. When the rated
temperature is reached, the solder
melts and the two link-halves separate
allowing the sprinkler to activate and
flow water.
Design Criteria
The TYCO RAPID RESPONSE Series
LFII Residential Concealed Pendent
Sprinklers (TY3596) are UL and C-UL
Listed for installation in accordance
with this section.
Note: When conditions exist that are
outside the scope of the provided cri-
teria, refer to the Residential Sprinkler
Design Guide TFP490 for the manu-
facturer's recommendations that may
be acceptable to the authority having
jurisdiction.
System Types
Per the UL and C-UL Listing, the
160
°
F (71
°
C) and 212
°
F (100
°
C) LFII
Residential Concealed Pendent Sprin-
klers may be utilized in wet pipe
systems. Only the 160
°
F (71
°
C) LFII Res-
idential Concealed Pendent Sprinklers
may be utilized in dry pipe systems, per
the UL and C-UL Listing.
Refer to Technical Data Sheet TFP485
about the use of residential sprinklers
in residential dry pipe systems.
Ceiling Types
Smooth flat horizontal, beamed, or
sloped in accordance with NFPA 13D,
13R, or 13 as applicable.
Hydraulic Design
(NFPA 13D and 13R)
For systems designed to NFPA 13D or
NFPA 13R, the minimum re quired sprin-
kler flow rates are given in Tables A and
B as a function of temperature rating
and the maximum allowable coverage
areas.
The sprinkler flow rate is the minimum
required discharge from each of the
total number of “design sprinklers” as
specified in NFPA 13D or NFPA 13R.
The number of “design sprinklers”
specified in NFPA 13D and 13R for wet
pipe systems is to be applied when
designing dry pipe systems.
SPRINKLER
ASSEMBLY
COVER PLATE
ASSEMBLY
COVER
PLATE
EJECTION
SPRING
RETAINER
WITH THREAD
DIMPLES
SEALING
ASSEMBLY
COMPRESSION
SCREW
DEFLECTOR
(OPERATED
POSITION)
SPRINKLER
WRENCHING
AREA
SOLDER LINK
ELEMENT
LEVER
SOLDER
TAB
DEFLECTOR
CAP
BODY
(1/2" NPT)
SADDLE
SUPPORT
CUP WITH
ROLL FORMED
THREADS
GUIDE
PIN
GUIDE PIN
HOUSING
THREAD INTO
SUPPORT
CUP UNTIL
MOUNTING
SURFACE IS
FLUSH WITH
CEILING
FIGURE 1
RAPID RESPONSE SERIES LFII RESIDENTIAL
CONCEALED PENDENT SPRINKLER (TY3596)
