Series LFII Residential Sprinklers Flat-Plate Concealed Pendent 4.9 K-Factor
The TYCO RAPID RESPONSE Series LFII Residential Flat-Plate Concealed Pendent Sprinklers (TY2524) are decorative, fast response, fusible solder sprinklers designed for use in residential occupancies such as homes, apartments, dormitories, and hotels.
The Cover Plate/Retainer Assembly conceals the sprinkler operating components 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 Concealed Pendent Sprinklers provides 1/2 inch (12,8 mm) vertical adjustment. This adjustment provides a measure of flexibility when cutting fixed sprinkler drops.
The Series LFII Residential Flat-Plate Concealed Pendent Sprinklers are intended for use in the following systems:
• wet and dry pipe residential sprinkler systems for one- and two-family dwellings and mobile homes per NFPA 13D
• wet and dry pipe residential sprinkler systems for residential occupancies up to and including four stories in height per NFPA 13R
• wet and dry pipe sprinkler systems for the residential portions of any occupancy per NFPA 13.
Historically, residential sprinklers, based on their Listing, have been limited to wet pipe sprinkler systems to assure speed of water delivery for a given prescribed design area (number of design sprinklers).
The Listing for the Series LFII Residential Flat-Plate Concealed Pendent Sprinkler now offers the laboratory approved option of designing dry pipe residential sprinkler systems.
For dry systems, as described in U.S. Patent 7,712,543, through extensive testing it has been determined that the number of design sprinklers (hydraulic design area) for the Series LFII Residential Flat-Plate Concealed Sprinklers (TY2524) need not be increased over the number of design sprinklers (hydraulic design area) specified for wet pipe sprinkler systems, as is customary for density/area sprinkler systems designed per NFPA 13, 13D, or 13R.
Consequently, the Series LFII Residential Flat-Plate Concealed Sprinklers (TY2524) offer the features of non-water filled pipe in addition to not having to increase the number of design sprinklers (hydraulic design area) for systems designed to NFPA 13, 13D, or 13R. Non-water filled pipe will permit options for areas sensitive to freezing.
The Series LFII Residential Flat-Plate Concealed Pendent Sprinkler has a 4.9 (70,6) K-factor that provides the required residential flow rates at reduced pressures, enabling smaller pipe sizes and water supply requirements.
This sprinkler has been designed with heat sensitivity and water distribution characteristics proven to help in the control of residential 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 complete, the Protective Cap is removed and the Cover Plate/Retainer Assembly is installed. Removing the Protective Cap is required for proper sprinkler performance.
UL and C-ULListed
The SeriesLFII Residential Flat-Plate Concealed Pendent Sprinklers are only listed withthe Series LFII Concealed Cover Plates having a factory-applied finish.
Maximum Working Pressure
175 psi(12,1 bar)
K=4.9GPM/psi1/2 (70,6 LPM/bar1/2)
Sprinkler:160°F (71°C)Cover Plate: 139°F (59°C)
1/2 inch(12,7 mm)