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Hot water off steam boiler controls
Hi all, My system is a Burnham Independance IN5 Steam boiler with a hot water loop controlling 4 Zones separate from the steam zone. The loop has a pump that circulates condensate through a heat exchanger, a aquastat and back to the boiler. The zones off the heat exchanger are controlled with an additional pump and honeywell zone control valves. When a zone off the loop calls for heat the circulators come on and the boiler ignites and runs until either the aquastat is satisfied or the room thermostat is satisfied. If the steam zone calls for heat the system will run until the pressurtrol shuts it down off pressure or the room thermostat is satisfied. This is the procedure when the steam and hot water zones call for heat separately
My question is if both steam and hot water loop call for heat at the same time the boiler will stay ignited until the steam system is satisfied even though the aquastat side which normally would shut down the boiler at 180F keeps the boiler ignited. How is this accomplished. What causes the aquastat to be overidden in this situation? Im just trying to figure out how this system is wired. The Burnham installtion manual dosent cover the wiring for this situation.