Nest Tstat & hydro-air

mastercraft

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

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

Thank you

I appreciate the feedback.