switching relay

  1. jtforester

    Taco Fuelmizer (SR501-OR) with SR504

    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...
  2. jtforester

    Taco SR501-OR Fuelmizer and SR504-EXP Relay

    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, all space heating baseboard zones. I need a 4th heating zone. The SR504-EXP and the P700...
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