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  1. SeanTech

    Navien Combi Boiler with Hydronic Air Handler

    Ok.. I checked into this, there is ONE relay available on the Navien motherboard the OPENS (breaks the circuit) when there is a DHW demand. I could feed the Green (24 V Fan control) from the themostat through this relay before it goes to the Air Handler Fan.. so wheneven there is a DHW request...
  2. SeanTech

    Navien Combi Boiler with Hydronic Air Handler

    My system using the Navien Combi-boiler (Heat + OnDemand hot Water) to produce hot water the runs to three Air Handlers for (three zones in my house) to provide heat via warm air blown into the rooms. The bottom line is that the Navien Combi-boiler can either be creating hot water on demand...
  3. SeanTech

    Navien Combi Boiler with Hydronic Air Handler

    Not sure this answers your questoin but... The Navien defaults to DHW priority, when it sees a request for DHW, it automatically shuts off the Taco cirulators so it can dedicate itself to warming up hot water. When the request ends, it waits about 3 minutes (default) and then turns the...
  4. SeanTech

    Navien Combi Boiler with Hydronic Air Handler

    Prior to the boiler conversation from Oil (traditional Boiler) to Gas (Combi Boiler) I didn't have this issue since I had a separate hot water Tank and the system could provide hot water and provide heat to all zones simultaneously. Bottom line - was no need to shut off air handlers when...
  5. SeanTech

    Navien Combi Boiler with Hydronic Air Handler

    First let me say, I am new to Combi-Boilers, so bare with me if I ask dumb questions. I recently converted from Oil to Gas for many reasons (including getting a whole house generator). I went with a Navien NFC-200 175 Combi Boiler that is using my three existing First Co HBXB-HW Hydronic Air...
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