Oscillating hydronic system

Discussion in 'HVAC Heating & Cooling' started by alternety, Jul 20, 2014.

  1. alternety

    alternety Like an engineer

    Messages:
    671
    Location:
    Washington
    I have a hydronic system. Five manifolds. A large system with half the circuits not being used. Upstairs - yes. Basement and garage - no. The system has been operating for more than 5 years.

    I have always had some noise in the system. A banging from the manifolds and detectable in rooms. It has been getting worse. It seems to correlate with the turning on and off of circuits based on demand. If you look at the little enclosed display rods that are supposed to show flow rate on on each circuit, they just jump up and down wildly.

    The system has ball valves on the supply to each manifold, and a rotary valve on the return. I am not sure what type of valve it is on return. But it seems to be a variable adjustment. Originally running an antifreeze that ate my boiler core, I am concerned that more components may be damaged. I flushed the system with fresh water, but the piping did really not let me get the entire system clean. I am going to fix that this summer.

    I could use a suggestion for a flush and antifreeze for when I get to that point.

    I am looking for input on most any of these issues. I have to get things resolved before freezing temperatures. I have several outside loops.
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