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  1. 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...
  2. 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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