what does the freeze option for sprinklers do in pyrosim

To date, antifreeze solutions are not listed for such use. As a result, new sprinkler systems are required to use listed antifreeze solutions. Afterwards, the National Fire Protection Association (NFPA) issued a Tentative Interim Amendment (TIA) that was incorporated into the following codes: The Standard for the Installation of Sprinkler Systems ( NFPA 13), The Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes ( NFPA 13D), the Standard for the Installation of Sprinkler Systems in Low-Rise Residential Occupancies ( NFPA 13R), and the Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems ( NFPA 25). The solution of glycol and water was thought to be safe, until 2009 when a fire intensified by the activation of a sprinkler system using antifreeze. Traditionally, the combustibility of glycol was offset by mixing it with water. Glycol is a combustible liquid that has a history of being used as an antifreeze solution for freeze protection in fire sprinkler systems.

What does the freeze option for sprinklers do in pyrosim