Taco Fuelmizer (SR501-OR) with SR504

Discussion in 'HVAC Heating & Cooling' started by jtforester, Jan 5, 2021.

  1. jtforester

    jtforester New Member

    Jan 5, 2021
    Hi everyone,

    First time poster here but have read these forums for years. Im adding a zone to my natural gas boiler and would like to add the outdoor reset control too. Right now I have a Taco SR503 3-zone switching relay, all space heating baseboard zones. I need a 4th heating zone.

    The SR504-EXP and the P700 outdoor controller seems like an expensive upgrade. Can I accomplish the same end result with the SR501-OR and the SR504-EXP? It would be even better if I can keep the SR503 and use the 501-OR as my 4th zone and OA reset but I think that's not possible because I would need the Tstat zone on the SR501-OR to tie-in the SR504.

    Any guidance is appreciated.

  2. fitter30

    fitter30 Well-Known Member

    Feb 2, 2020
    Retired service tech
    Peace valley missouri
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