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relief valve popping

jeff dustin
jeff dustin Member Posts: 3
in THE MAIN WALL
I got a call that my customer's relief valve was popping. I show up and find the expansion tank water logged. I changed the pop safety valve and expansion tank. Well I just got a call back from the customer and the pop safety is blowing again! The boiler is a slant fin hot water boiler 109,000 btu with 6 zones including a domestic hot water, 30 lb. pop saftey, #30 extrol tank, and the system also has anti-freeze in it. Need help! Any Answers?

Comments

  • fishface
    fishface Member Posts: 10


    What pressure is the water feed feeding the boiler to? With 6 zones a # 30 might be too small. You might have to use a #60 Does this boiler have a domestic hot water coil? If so it might be slowly leaking domestic water pressure into the boiler
  • Ken D.
    Ken D. Member Posts: 836
    Relief Valve

    I agree with F.F. the Tank may be too small or the domestic coil could be leaking. Or- the auto or hand feed valve may be bypassing. If the tank wasn't new I would also suggest the tank diaphragm could be ruptured.
  • nick z.
    nick z. Member Posts: 157
    Piping

    Isolate domestic water to eliminate that as a problem.
    Also look at system piping, make sure feed vlave isn't being pulled open when the circulator is running.
  • jeff dustin
    jeff dustin Member Posts: 3
    relief valve popping

    The autmatic feed is shut-off due to the anti-freeze in system. the domestic hot water is a boiler mate.
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