Hydronic Heater - replacing analog thermostat with digital


Old 09-13-14, 10:51 AM
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Hydronic Heater - replacing analog thermostat with digital

Hi all,

I recently purchased a townhome that has Turbonics Toester 4/5 wall heaters installed in each room. My water heater in the garage heats the water for these units, circulating water throughout the house. In each room, there is a standard thermostat (looks like this: http://www.lowes.com/pd_201439-13468...ductId=3477015) tied to the unit. I'm looking to install new digital thermostats in each room to fit in with the remodeling work I am doing, as the old thermostats appear dated/yellowed.

I purchased an Aube thermostat (here: https://www.google.com/shopping/prod...d=0CIEBEKYrMAI) which effectively turns on the unit, but the fan never turns off. I have to switch the unit on and off at the wall heater (it has an on/off switch) as the Aube thermostat leaves the fan on.

What do I need to be looking for in a new digital thermostat? I would assume the Aube doesn't have the fan control necessary for these Turbonics heaters.
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Old 09-20-14, 03:31 PM
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Anyone have any ideas/input? Thanks in advance.
Old 09-20-14, 04:00 PM
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Don't know how I missed this one first time around... sorry 'bout dat.

AFAIK, the Turbonics, like most other of this type of heat emitter, control the fan by the water temperature flowing through it.

The fan kicks on when the water gets hot, and off again when the water cools.

The thermostat should typically not have any effect on fan operation.

Do the thermostats have only two wires? If so, there's no fan control involved.

How long are you waiting after the heat call is ended?

Run the heat and after the boiler shuts down from the thermostat being satisfied, wait a while and the fan should shut off by itself as soon as the water in the unit cools down.

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