control web base t stat for 2 stage heat

Sol Hydronics

I know someone out here knows what thermostat is user friendly web base and can operate a 2 stage system. !st being radiant heat and second being fan coil air handler. the radiant has its own pump and the air handler has its own pump. Thanks and look forward to seeing how people are dealing with this.

njtommy

Honeywell Prestige would be able to handle that. On the EIM board you can hook a 3 sets of dry contacts to the board and just program them to bring on as staging is needed. You set staging up by temp off set from set point. Are you running a pipe aqua stat for the fan?

Sol Hydronics

Thanks for your idea. I will took into that thermostat and yes I was thinking of a pipe aqua stat to turn on and off the fan coil. Thanks

Sol Hydronics

Is it as easy as 'w' turns on the radiant and 'w2' closes a cube relay to turn on the fan coil pump? If so any thermostat could work like a nest. What am i missing?

Sol Hydronics

I am starting to think I might be dumb or this is something no one is doing. I sure wish someone would share please.

hot_rod

I have an Ecobee t-stat in my shop that has two stages, web based viewing and adjusting.

Sol Hydronics

Thanks hot rod, could you please tell me if I have 2 stage , radiant is first and fan coil is second , this t stat could pull 2 separate relays for this?

hot_rod

yes, but you need to be careful with wiring if you have a 24V source from two different loads. The directions show you how to wire it, either way.

Here are some examples, and they have good tech support.

https://www.ecobee.com/faqs/

njtommy

Yes you can do just that. get a double pole realy and when second stage calls it will bring on the zone valve and blower motor for the hydro air. It's easy to do. Your not the only one doing it.