Series LFII Residential Sprinklers Flat-Plate Concealed Pendent4.9 K-Factor
The TYCO RAPID RESPONSE Series LFII Residential Flat-PlateConcealed Pendent Sprinklers (TY2524) are decorative, fast response, fusiblesolder sprinklers designed for use in residential occupancies such as homes,apartments, dormitories, and hotels.
The Cover Plate/Retainer Assembly conceals the sprinkleroperating components above the ceiling. The flat profile of the Cover Plateprovides the optimum aesthetically appealing sprinkler design. Additionally,the concealed design of the Series LFII Residential Flat-Plate ConcealedPendent Sprinklers provides 1/2 inch (12,8 mm) vertical adjustment. Thisadjustment provides a measure of flexibility when cutting fixed sprinklerdrops.
The Series LFII Residential Flat-Plate Concealed PendentSprinklers are intended for use in the following systems:
• wet and dry pipe residential sprinkler systems for one- andtwo-family dwellings and mobile homes per NFPA 13D
• wet and dry pipe residential sprinkler systems for residentialoccupancies up to and including four stories in height per NFPA 13R
• wet and dry pipe sprinkler systems for the residential portionsof any occupancy per NFPA 13.
Historically, residential sprinklers, based on their Listing, havebeen limited to wet pipe sprinkler systems to assure speed of water deliveryfor a given prescribed design area (number of design sprinklers).
The Listing for the Series LFII Residential Flat-Plate ConcealedPendent Sprinkler now offers the laboratory approved option of designing drypipe residential sprinkler systems.
For dry systems, as described in U.S. Patent 7,712,543, throughextensive testing it has been determined that the number of design sprinklers(hydraulic design area) for the Series LFII Residential Flat-Plate ConcealedSprinklers (TY2524) need not be increased over the number of design sprinklers(hydraulic design area) specified for wet pipe sprinkler systems, as iscustomary for density/area sprinkler systems designed per NFPA 13, 13D, or 13R.
Consequently, the Series LFII Residential Flat-Plate ConcealedSprinklers (TY2524) offer the features of non-water filled pipe in addition tonot having to increase the number of design sprinklers (hydraulic design area)for systems designed to NFPA 13, 13D, or 13R. Non-water filled pipe willpermit options for areas sensitive to freezing.
The Series LFII Residential Flat-Plate Concealed Pendent Sprinklerhas a 4.9 (70,6) K-factor that provides the required residential flow rates atreduced pressures, enabling smaller pipe sizes and water supply requirements.
This sprinkler has been designed with heat sensitivity and waterdistribution characteristics proven to help in the control of residentialfires and to improve the chance for occupants to escape or be evacuated.
The Series LFII Residential Flat-Plate Concealed PendentSprinklers are shipped with a Disposable Protective Cap. The Protective Capprotects the sprinkler during ceiling installation or finish. After ceilinginstallation is complete, the Protective Cap is removed and the Cover Plate/Retainer Assembly isinstalled. Removing the Protective Cap is required for proper sprinklerperformance.
UL and C-UL Listed
The Series LFII Residential Flat-Plate Concealed Pendent Sprinklers are only listed with the Series LFII Concealed Cover Plates having a factory-applied finish.
Maximum Working Pressure
175 psi (12,1 bar)
K=4.9 GPM/psi1/2 (70,6 LPM/bar1/2)
Sprinkler: 160°F (71°C)Cover Plate: 139°F (59°C)
1/2 inch (12,7 mm)