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Adding outdoor reset

Halbert Member Posts: 15
I have hot water baseboards, with a Trane boiler, 3 taco zone valves and taco valve controller, and honeywell I 7724 aquastat. I'm thinking about adding a Honeywell 8735Y1000 outdoor reset with the wireless temperature unit.

What are the pitfalls of adding outdoor reset to a system with zone valves? It appears obvious that a system which would run the circulator all the time would need the recirculation valve opened a little to keep the pump from dead heading when all the valves are closed--or is it better to program it so that the pump runs only when one of the valves is open?

I live in suburban Philadelphia, so it rarely goes below 10F outdoors. I run with a 5 F turndown at night, and during the day when no one is home. I have found that if the outdoor temperature falls below 15F, I need to have the aquastat set to 190 or 200 to get decent recovery time.

I'm open to suggestions.


  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
    edited February 2021
    If it’s oil, don't bother unless you’re putting in a buffer tank.

    There was an error rendering this rich post.

  • Zman
    Zman Member Posts: 7,573
    What model boiler?
    Is it condensing?
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • Halbert
    Halbert Member Posts: 15
    zman: I erred: It is a Lennox COWB3-3-1.00