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First Winter with TT Solo 110
Over the summer, I had a TT Solo 110 installed in my house. We used my existing Boilermate indirect for DHW and 3 zones of fin tube baseboard for heat. Much of the fin tube on the main floor of the house was replaced with high output fin tube to minimize the water temperature needed to heat the house.
All was well until the fall when we turned on the heat. I expected some short cycling during the shoulder seasons, but observed that the return temperature is always only roughly 2 degrees less than the supply (as measured by the boiler). The house is staying warm so I know that heat is being removed from the water as it is circulated. I suspect that the flow rate through the boiler's heat exchanger is much greater than through my zones and therefore supply water is flowing backward through the closely spaced tees and heating the return water. The internal circulator in the boiler is set to LO and the zone circulators are set to HI (all are Grundfos 15-58s).
The piping appears to match the schematic in the TT manual. I've attached pictures and am hoping that someone can confirm it is correct or suggest how to fix it.
Thanks in advance.
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