I've heard of contractors pumping up sprinkler systems a few lbs over domestic 
supply, rather than leaving the sprinkler at supply pressure,  so there is no 
subsequent flow alarm after running an Inspectors test.

For example, our City water pressure trends up in the very late hours, then 
down as daytime usage increases.  This is about a five to eight pound change, 
sometimes it's enough to cause systems with failed check valves and short flow 
detection cycles, to alarm.

On Oct 12, 2016 8:38 AM, "Steele, Andrew" <andrew.ste...@daytonohio.gov> wrote:
Check valve failure, so that the sprinkler leg is no longer isolated?

-----Original Message-----
From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On 
Behalf Of Barry Levine
Sent: Wednesday, October 12, 2016 1:01 AM
To: sprinklerforum@lists.firesprinkler.org
Subject: Seeking false water flow alarm suggestions

I drained all the water from my pipes when I installed a new water 
filter/softener system in my home. After installing the new system, which 
replaced some 3/4" pipe with 1" pipe in my home water system, I have been 
getting false alarms from my Potter Electric Signal Co VS-SP flow sensor. I 
flushed my sprinkler system using the drain and the test valve, yet I believe 
some air pockets may still remain in my two areas of coffered ceilings, where 
the sprinklers sit 1 foot above the rest of the system. Potter recommends 
replacing the VS-SP with a VSR-ST. I'd prefer not spending the money to replace 
the sensor, but I'd like to hear from the professionals before I make that 
decision. I'm thinking there may be other solutions, especially since I never 
had any false alarms during the previous 20+ years. Possibly I could attach 
saddle valves between each of the two sprinklers in the two coffered ceilings 
and bleed the air out. Unfortunately, I've never had any long-term luck with 
saddle valves, as they have all become inoperative over time. I've attached a 
photo of my water system in case that might be helpful. Feel free to ask any 
questions or offer any solutions. Thank you.

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