Therefore, the foregoing is considered as illustrative only of the principles of the fire protection system. Further, since many modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to falling within the scope of the invention.
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 in the western third of the United States, arid conditions create extreme fire danger during certain periods every year. Residential building have become more vulnerable in recent years due to the fact that many homes are left unattended for long periods of time because they are occupied as vacation homes or by families in which both parents work. Compounding this problem is the proliferication of homes in scenic forested or mountainous areas where the quality of life is superb, but the fire danger is high.
 While some of these areas are served by rural fire protection districts, the response times of these entities are generally very long. Moreover, many mountain homes are simply without public fire protection of any kind. Home owners in these high risks areas face significantly higher insurance premiums than city homeowners, and some are not able to obtain fire coverage at any cost.
 Several systems are known for protecting buildings from the risk of fire. Such systems are described in U.S. Pat. No. 4428434 to GELAUDE, U.S. Pat. No. 5165482 to SMAGAC et. al, U.S. Pat. No. 5263543 to NIGRO, U.S. Pat. No. 5692571 to JACKSON and U.S. Pat. No. 5732511 to SCOTT.
 While these devices fulfill their objectives, they do not describe a fire protection system with a single large gun nozzle that is comparatively inexpensive to install and maintain and that is effective in protecting single rural properties and multiple homes on smaller city lots.
 The present invention is therefore directed to a fire protection system that is inexpensive to install and maintain and that is simple yet effective in protecting a building from approaching fire.
 The present invention employs, in accordance with the illustrated preferred embodiment, a plurality of radio frequency temperature sensors remotely located around a building to be protected, one or more sprinkler heads coupled to a water supply line and mounted on the roof of the building to provide sprinkler coverage of the building and/or a perimeter area surrounding the building, and control circuitry responsive to a radio frequency signal transmitted by one or more of the remotely located temperature sensors when a temperature exceeding a threshold temperature of the sensors is sensed thereby to initiate the flow of water to the one or more sprinkler heads for a predetermined period.
 Referring now to
 Referring now to
 In operation, one ore more of the remotely located heat sensors