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Outrageous Banging

BangerBanger Posts: 2Member
Having a problem with a Slan Finn boiler. When the boiler starts up we get banging in the pipes. We have tried the standard fixes including changing expansion tank, lowering pressure and temp. The banging seems louder than we would generally hear from expansion problems.
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Comments

  • RichRich Posts: 1,087Member ✭✭✭
    Is this

    a new install done recently or did this problem just appear ?  A bit of background would be helpful to help
    You didn't get what you didn't pay for and it will never be what you thought it would .
    Langans Plumbing & Heating LLC 732-751-1560
    Serving most of New Jersey , Eastern Pa .
    Consultation , Design & Installation
    Rich McGrath 732-581-3833
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  • icesailoricesailor Posts: 7,219Member ✭✭✭✭
    Lower Pressure:

    Why would you lower the temperature and also lower the pressure at the same time?

    I'd be setting the pressure to over 20# and then lower the temperature to 140 and see what happens. You can do one or the other, but if you do both, how will you know which one is the problem if it stops?



    Illogical Troubleshooting.
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  • BangerBanger Posts: 2Member
    Slant fin remedies

    added zone to existing. tried each fix one at atime
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  • RichRich Posts: 1,087Member ✭✭✭
    Zone valves

    how many and what type of circulator is moving your fluid ?   Please try to tell us if this happens when all zones are opened or if only when some are open and some closed .  Did this happen before and got louder and worse and why did you add a zone ?  Your piping may be strapped and supported poorly where you can or cannot see , couple this with a single speed pump that is just right or oversized and when those valves close and the velocity changes in the open zones it can make a hell of a racket .  Bad support and strapping alone can cause this issue but if it got louder when you expanded the number of zones and added a valve makes it suspect .  A Delta T pump can lessen or eliminate this problem then if it persists continue searching . The new pump is a nice addition anyway and will improve the wire to water efficiency and fuel consumption somewhat .  You can only fix one thing at a time as it seems you already know .
    You didn't get what you didn't pay for and it will never be what you thought it would .
    Langans Plumbing & Heating LLC 732-751-1560
    Serving most of New Jersey , Eastern Pa .
    Consultation , Design & Installation
    Rich McGrath 732-581-3833
    · ·
  • earl burnermannearl burnermann Posts: 126Member
    where do you live that you are using heat in June?

    Are there any calls for heat in your home at this time of year?

    Are you using circulators or one circulator and multiple zone valves?

    Do you have a indirect water heater that uses a zone valve to supply boiler water to the appliance during a call for hot water?

    If you are using zone valves, what brand and model are you using?
    If the women don't find you handsome, they should at least find you handy!
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