ecobee thermostat installation with an isolation relay

If the boiler utilizes dry-contact T & T terminals then an isolation relay is needed to have the ecobee3 interface with the boiler control. Below is a diagram illustrated how the ecobee would be wired in this scenario (ecobee3 backplate shown).



We recommend a single pole, normally open (SPNO) 24VAC relay, commonly referred to as a fan relay (see below).


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