Wiring diagram for hydronic baseboard heat with a heat pump air handler

[Werdfu]

Hi google support is useless with supplying a wiring diagram for my issue

The customer has a 3rd generation nest learning stat

There is currently a hydronic baseboard heating system with a strictly cooling 5 ton unit controlled by this stat

The customer would like to change cooling unit to heat pump system with an emergency electric strip heater in air handler as hydronic heat doesn’t keep up on very cold days

I can easily upgrade low voltage wire to allow for heat pump system

The Nest thermostat currently is using a 2 transformer system 

Google said this version of stat is compatible with hydronic heat and heat pump air handler

But they can’t seem to provide a wiring diagram for this new setup

i am pretty sure how this can be wired

By using a single transformer and use w1 as hydronic w2 as heat pump and possibly Aux  for   
electric emergency heat

But i really would like google to provide me with proper diagram,,but they are useless!!!

The customer would like to use hydronic heat as first stage heat and heat pump as second stage and electric heat as emergency heat

Can any one provide an basic diagram of how I can set this up

Any help would be greatly appreciated 

Thnx

[CoolingWizard]

Werdfu,

you have a couple of problems with what you’re trying to do with your systems versus your control systems. First of all if you defined the system as a heat pump, all thermostats will choose the primary source of heat as being the heat pump. Now the heat pump can have both a auxiliary heating and an emergency heating system as part of it. when the heat pump goes into defrost mode, it normally activates the auxiliary heat so that the air remains warm while the air conditioner is running in order to defrost the coils if you will. The emergency heat is typically electric heat strips in the air handler when the heat pump gets so cold outside it cannot keep up with the demand, the emergency heat can be energized. 

you say that the hydronic heat system, cannot warm the house on the coldest of days. I’m curious to know what is the BTU output of the boiler? And if you need some additional help rather than switching to a heat pump, add heat strips to the air handler mark them emergency heat, and turn them on when the boiler can’t seem to keep up to get added heat and air moving through the air handler. The air handler will be doing nothing with just the boiler is on anyway so it is available to move air around just the same. Can you provide me the make  and model number for the air handler please?

Ken, The AC Cooling Wizard 

[Jhonleanmel]

Hey folks, 

We appreciate your help here, @CoolingWizard.
@Werdfu, I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

Thanks,
Mel

[Jake]

Hey there,

I wanted to check in and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.

Best regards,
Jake

[Jake]

Hey there,

I wanted to check in, and let you know that I will be locking the thread in 24 hours.

Best regards,

Jake