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Heating not working in the floor where the distribution system was changed

mbyregow
mbyregow Member Posts: 3

The distribution circuit system was replaced after a leak was found at one of the joints in the old system. Before removing the old system, the entire circuit was flushed and then refilled once the new system was installed.

However, the floor where the new distribution system was installed isn’t getting any hot water circulation. It's as if the boiler can't detect any radiators on that floor. I've already tried re-flushing and refilling the system, and bled all the radiators and the boiler, but the issue persists.

The other floor, where the distribution system wasn’t changed, is functioning normally, and all the radiators there heat up properly. I'm a bit stumped on what else to try and am currently waiting for a plumber to inspect the distribution system installation. I have a new Intergas Xtreme boiler. Any advice or suggestions on what I could try in the meantime would be greatly appreciated.

Comments

  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,317
    edited September 30

    Are the grey PEX lined purged?

    When you purged all the white PEX lines and you got water to flow thru each one, did you do it at the opposite end of the gray tubes? If there is still some air in the other grey PEX line (the one you didn't use to purge the white ones) then the circulator may be pulling at air in the line.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    mbyregow
  • mbyregow
    mbyregow Member Posts: 3

    Thanks for responding. If by purging you mean bleeding the grey tubes, then yes, I’ve done that several times. Water flows out almost immediately from the bleed valve each time.

  • Unfortunately, those manifolds don't allow you to purge loop by loop as there are no individual valves on the loops. And you can't use the little bleed valves at the manifold to purge air in the piping. You need a high volume of water to purge both the grey tubing and all the white tubes and it should be done with the proper valving at the boiler.

    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
    hot_rodMad Dog_2mbyregowGroundUp
  • hot_rod
    hot_rod Member Posts: 23,275

    You might hook a garden hose and blast all the loops with high Flow/ pressure

    Isolate the manifold from the boiler if you do, it cannot handle over 30 psi

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    Mad Dog_2mbyregow
  • Releasing trapped air is one of the high points in my day. So satisfying.

    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
    Larry Weingarten
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,317

    I wonder what an emergency exhaust valve is? I'm thinking Pressure Relief Valve…. If so, that is quite an interesting way to purge air. and we know that the relief valve was operated per the manufacturer's recommendation. You know , that tag on every relief valve that says Operate relief valve at least once a year to insure passage ways are clear. That important instruction that more than half of our industry's technicians were taught to never touch because it might leak.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    Larry WeingartenAlan (California Radiant) Forbes
  • hot_rod
    hot_rod Member Posts: 23,275

    on some fire tube boiler designs, that upper relief is about the only way to quickly evacuate air. The small float vent can take days to get a big air bubble out.

    Assuming there is one and its open😯

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream