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Nest Tstat & hydro-air

mastercraft Member Posts: 24
I'm going to be installing a Nest 2nd Generation Tstat for two indirect fired air handlers.  There is precious little info online for this.  I know that there is separate R terminals.  What I don't know is that when RW pulls the heating loop i n to heat up the coil in the air handler, will R make to G to bring in the fan for heat.    Not sure if I need a Taco HAFC at the air handler or a strap-on aquastat @ the A/H for the delay at the beginning of the heating cycle.     Thanks..any input will be appreciated.   


  • RPK
    RPK Member Posts: 98
    Nest Setup

    You can set the Nest for various heat sources. Setting it for electric heat would close R to G on a call for heat, but won't give you any delay to warm the coil. I don't think there are any other heat source options that give you fan with heat, but I will check next time I see a second generation Nest. A strap-on aquastat sounds like the best solution. Or you could set the Nest to activate fan but also install a delay-on-make relay.
  • mastercraft
    mastercraft Member Posts: 24
    Thank you

    I appreciate the feedback.