First, the loop requires a Reduced Pressure Backflow. Are you using the check valves to separate the two canopies?
Sent from my Verizon Wireless 4G LTE DROID Douglas Hicks <[email protected]> wrote: We have a building with 2 outside canopies, each is protected by an antifreeze loop. The sprinkler system has a backflow in a pit. Do each of the 2 antifreeze loops need a one way swing check valve, with a hole in the clapper? I will put a test port at each end of both loops, even though the loops are not 150 gallons.
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