Taco Fuelmizer (SR501-OR) with SR504

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jtforester

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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.

John
 
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