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  • bobby32x
    So I am reading the explanation of primary secondary loops and part of why it's not on my system is I don't understand hydraulically decoupled etc. Do you mean that the system needs a 2nd circ pump on the discharge of the boiler to remove the pressure built up by the boiler circ pump? The only thing I feel I don't have is the tempering connection that connects the return line to the supply line. On my system I basically disconnected the old boiler setup and connected the new and thought it was fine because it worked on the old setup. Essentially I have a single circ pump and the 2 zones (upstairs and downstairs) are controlled via zone valves that are on a zone switch. A thermostat calls for heat, the appropriate zone valve opens and the loop is opened to heat that zone. Page 32 of the manual shows a system that is quite similar to my setup in my opinion. Thanks, Bob
    December 2019
    • GroundUp
      GroundUp
      Primary secondary basically means that each loop can circulate independently from the other. This is "hydraulic separation". So the internal boiler circ can circulate only the boiler in a short circuit, while the other circ can carry what it needs to the loads. It is in the manual, it'll show two tees very close together underneath the boiler
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