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  1. #1
    Join Date
    Jun 2005
    Posts
    7

    Confused

    Okay, this is going to be a very non-technical question ... so please bear with me. We have a hydro-air system, a Peerless Furnace and First Co (air return??). Our house is 1.5 yrs old. Recently, we've had a clunking noise reverberating from the basement which I have found to be in exact 6 hour intervals. What happens is one of the zones (we have 3) calls for heat, the furnace turns on, about 2 minutes later the furnace turns off with a whoosh and then across the room by the air handler there's a clunk. I've had our furnace repair guy here and he's disconnected the wires to the furnace from that zone and the noise doesn't happen. Then he tried disconnecting just from the thermostat and it still happens. He thinks there could be a crossed wire? But it doesn't make sense that something is timing this at exact 6 hour intervals. Any ideas, this is driving us crazy!!!!

  2. #2
    Join Date
    Jun 2005
    Location
    New York
    Posts
    207
    I will take a stab at this one lol. You have a peerless boiler, first company a/h with hot water coil, correct? Not sure where you live and it doesnt matter, just couldnt believe that your still using heat.. If you have programable stats on other zones that may be calling for heat at that 6th hour, its possible that you have a bad zone valve (if you have one circulator) or you have a leaking or defective one way check on that zone causing water to enter that coil and turn on the blower on that zone????????? The fan may come on if the coil gets hot unless your fan control for heat is done by the stat and not water temp to that zone. Is the noise your hearing the duct making noise when the fan comes on?. Just a stab in the dark without being there myself..

  3. #3
    Join Date
    Jun 2005
    Posts
    7
    Thanks for being so brave to reply to my issue. And you are correct my heat is off, but this is happening whether the thermostats are on heat, off or A/C. We've checked the programs on all the other zones and there's nothing set for that timeframe. The noise is like a pressure release. Once the furnace goes off, you hear like a hissing sound then across the room you hear like a pipe clunk. I will pass along your response to our repairman. If you can think of anything else, I'd appreciate it.

  4. #4
    Join Date
    Jun 2005
    Location
    New York
    Posts
    207
    You keep saying furnace.. You mean the boiler right? Why does the boiler run? Do you have a tankless coil or indirect water tank off this boiler for your domestic hot water? The boiler is water not steam right? Oil or gas?

  5. #5
    Join Date
    Jan 2005
    Location
    Littleton, CO
    Posts
    263
    Is the water line going to that zone filled with water? You might have an air pocket, Possibly a leak. It sounds like your hearing this when the pump is turning on or possibly off.

  6. #6
    Join Date
    Jun 2005
    Posts
    7
    Sorry for being so clueless about this. Yes, it is a boiler. We have a separate (indirect?) water tank. And it's oil heat. The key to this is that it doesn't happen all the time. The boiler comes on to heat the water and when we had the heat on, it would come on to heat the house, this noise does not happen then. This noise ONLY happens at specific times at 6 hour intervals. It's so reliable I was able to get my repairman to hear it on cue! Is there anything else in this system aside from the thermostats that is timed? thanks again for the replies!

  7. #7
    Join Date
    Jun 2005
    Location
    New York
    Posts
    207
    Patrice, there really isnt anything else "timed" like your explaing like the T-Stats in that system, that I could see from here lol. It sounds like the Indirect ( thats the name for a water heater or storage tank that doesnt have direct means of heating up like oil, gas, electric etcc) Its using the boiler water to exchange the heat to your domestic ( faucet water). There could be alot of things going on, but we just cant hear or see them lol. If you were the service tech, we could help you more. It could be water hammer, an air bleeder etc etc. You said he was there and heard this? He should know what it is, if not, maybe you need another set of eyes and ears down by your boiler.. When the pipes bang, do you feel and hear it at the sinks and in the walls etc? If your water heater has an oil burner firing into it, its not an indirect. If thats the case, turn off the boiler, (its just for heat) and see if the noise goes away.

    [Edited by ultratec on 06-21-2005 at 02:40 PM]

  8. #8
    Join Date
    Nov 2001
    Location
    Seattle, WA
    Posts
    7,751
    You probably have a zone damper slamming shut or open in that zone that has been disconnected and the noise stops. And the 6 hour intervals might be due to the timer for fresh air that will cause the blower in the furnace to energize, the outside air damper to open, and all the 3 zone dampers to open (which would explain the noise)for total air flow throughout your home.

    Have the tech run each zone damper open and closed to see if that is the noise.
    "The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
    - Alexis de Toqueville, 1835

  9. #9
    Join Date
    Jun 2005
    Location
    New York
    Posts
    207
    Originally posted by DeltaT
    You probably have a zone damper slamming shut or open in that zone that has been disconnected and the noise stops. And the 6 hour intervals might be due to the timer for fresh air that will cause the blower in the furnace to energize, the outside air damper to open, and all the 3 zone dampers to open (which would explain the noise)for total air flow throughout your home.

    Have the tech run each zone damper open and closed to see if that is the noise.
    That could be it Delta. With all this furnace and boiler talk, I didnt think they have a Zone damper system, and still dont know if they do. If thats the case, good read Delta.. It may even be the bypass damper if they have one.

    [Edited by ultratec on 06-21-2005 at 04:25 PM]

  10. #10
    Join Date
    Jun 2005
    Posts
    7
    Thanks for all your help. At this point I'll have to relay all these messages to our repairman and see what he thinks. At this point I think I know more than I ever wanted to know about our heating system .... and it's still not enough! But I appreciate all the help and I might be back on once I get some input from our repairman.

  11. #11
    Join Date
    Jun 2005
    Location
    New York
    Posts
    207
    Good luck Patrice, hope you get your problem solved..

  12. #12
    Join Date
    Nov 2001
    Location
    Seattle, WA
    Posts
    7,751
    Do you know the maker of your zone system? Is it a California Economizer, heating only?
    "The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
    - Alexis de Toqueville, 1835

  13. #13
    Join Date
    Jun 2005
    Posts
    7
    Delta, I've spoken to my husband and we don't have a zone damper system. We have 3 separate air handlers for our 3 zones. If you can think of anything else ... Thanks for your help so far.

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