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Warm water circulating in heating circuit when indirect firing
I just did the initial firing of of a little MS 26 Mega-Stor tied to a Triangle Tube Solo 60. Interestingly hot water began to immediately convect strongly in the heating circuit and do so in opposite the normal direction of flow. This surprised me greatly as there is a swing check in the heating circuit that should I would think prevent this direction of flow.
Obviously we don't want heat when it's not called for and on top of that certainly don't want the high temperature water used for DHW production coming in contact with concrete floor of the radiant heating system.
For now I've stopped the convective flow by closing one of he valves in the heating circuit but would like to get the problem sorted sooner rather than later.
Might the swing check be stuck open? Is there a better alternative to the swing check such as the Taco 241 flow check?
We're seeing very effective hot water production by the MS-26 with the CH circuit isolated from the DHW circuit.
Thanks for any informed replies,