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Can one zone valve receive current from two Stats?
When I replace my current oil boiler with a coal boiler I will need to make at least one of the thermostat controlled zones (zone valves) in my house into a "dump" zone. An aquastat signal when the boiler hits 210 degrees F. must open a zone valve to dump excess boiler heat. Can one of my zone valves be linked to both a 24 VAC thermostat (for normal zone heating use) and also a boiler linked aquastat (also 24 VAC) for the purpose of excessive boiler temperature reduction? What will happen if the thermostat and the aquastat are both energizing the same zone valve at the same time? Will it work fine in this case, or will it fry the zone valve (and more)?