I have a friend that every time his sprinklers shut off the fire alarm bell will ring for a second. This has been going on for years and started to get worse so I installed a regulator at the sprinklers the the house and still the alarm goes of a little the pressure on his fire sprinklers actually will rise to 180 psi the city water pressure is 110 psi how does that happen. He calls and tells me that another neighbor he met had the same problem a few years back and a plumber installed a hammer arrestor which fixed the problem so I installed 1 on his house no more alarm. This just don't seem right now the reason I'm asking about this problem is that a plumber buddy of mine had changed a regulator and ball valve for a customer and there complaining about the fire alarm ringing just for a second. This is only the 3rd one i have heard of any ideas on what it could be? I thought maybe air in the fire sprinklers causing the problem but why does the pressure just in the fire sprinkler rise so high? Any thoughts out there
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fire bell rings