Amir Eyal
New Member
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 service ports on the Manifold were open by turning the screws half a turn and connected the two hoses to the ports. When I turn the pump on there was no flow through the heat exchenger as if some valve was closed and not letting the water circulate.
Does the 3 way valve have to be in the position of the primary heat exchenger to flush it? How do I manually do that? Am I missing something else? Thanks for the help!
I made sure the service ports on the Manifold were open by turning the screws half a turn and connected the two hoses to the ports. When I turn the pump on there was no flow through the heat exchenger as if some valve was closed and not letting the water circulate.
Does the 3 way valve have to be in the position of the primary heat exchenger to flush it? How do I manually do that? Am I missing something else? Thanks for the help!
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