Concealed Pendent 4.9 K-Factor

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.