Sprinkler and Antifreeze Loop Repair 11/15/22 Material in shop in Novi DH Install the missing main drain sign providing proper identification of system components. The tech will add the missing supervision to the control valve. This will prevent tampering with. There are quick response sprinkler heads installed throughout the building that has been in service for more than 20 years and are due for testing. The tech will pull (4) of the heads and send them to UL for testing. New sprinkler heads will be installed in place of the ones pulled. Currently, the anti-freeze system is not operational. Tech will asses why the system is not operational.