Recent content by Amir Eyal

  1. Amir Eyal

    Balancing flow through primary / secondary on Navien NCB-240

    This is the internal circulation pump Navien 30012768A Circulation Pump http://bostonheatingsupply.com/30012768.aspx
  2. Amir Eyal

    Balancing flow through primary / secondary on Navien NCB-240

    I have a Navien NCB-240 piped Primary / Secondary. The secondary loop is feeding a couple of manifolds that split off the flow to half inch PEX-AL_PEX home runs to 12 cast iron radiators. The boiler is set to run on reset curve with max temp of 140 at 5 degrees outdoor temperature and 104 at 60...
  3. Amir Eyal

    Trouble Flushing Navian NCB primary heat exchenger

    Thanks fitter30, I called Navian and they suggested flushing the primary heat exchenger once a year. I saw the video you posted a link to. I did exactly what was shown there and was unable to get water flowing through the primary heat exchenger. It's interesting to see that someone commented on...
  4. Amir Eyal

    Trouble Flushing Navian NCB primary heat exchenger

    Hi everyone, I have a Navian NCB 240 combi boiler with a Navian Primary Secondary Manifold. I was able to flush the domestic Hot water heat exchenger with no issue using a pump, 5 gallon bucket and 2 hoses. I am having no luck when trying to flush the primary heat exchenger. I made sure the...
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