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4 Way Mixing Valve Piping
Hello to the Wall - I am a new member planning improvements to an inherited in-floor radiant system. My present system features a single zone supplied by a Thermo Control 2500 wood boiler (125K BTU, 130 gallon water capacity, 180 degree Aquastat with 20 degree differential on the outlet). A Taco 007 circulator supplies the system through a Taco 3-way thermostatic valve. There is only one piping loop for the system supply and return, with no provision for boiler return temperature protection. It seems that a smart 4-way valve with outdoor reset will improve efficiency while providing boiler protection. My question is this: Must I create a primary/secondary piping arrangement for the 4-way valve? The Caleffi Idronics manual #7 figure 6-11 suggests that P/S is not required, while the Taco installation instructions show that it is. I prefer the simpler installation, but don't wish to ignore the benefit of a P/S arrangement. Any assistance and opinions will be greatly appreciated! Thanks.