However it is not compatible with multistage systems or electric baseboard heating systems.
Thermostat for modulating gas furnace.
The gas valves of these furnaces open anywhere from 40 to 100 depending on the precise need for heat in the home.
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With a modulating furnace the flame increases or decreases in smaller finer increments so that room temperature never varies more than 1 or 2 degrees from the thermostat s target temperature.
In many cases the controls including the thermostat are proprietary.
Industry first patented features and exclusive design make the rheem prestige series modulating r98v gas furnace a smart option.
Other gas furnaces such as the two stage gas furnace only offer two stages.
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Some of them adjust in increments as little as 5.
Using the vehicle analogy the modulating furnace would be closest to the way that a car drives able to range from a full stop to maximum speed but with innumerable cruising speeds between the two.
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It s too bad that trane and other manufacturers it appears are going down the road of proprietary thermostats for their highest end modulating solutions.
Therefore for the modulating furnace to operate properly the controls need to be set up properly.
It is mainly designed as a gas furnace thermostat to control the gas furnace or ac.
You will need the manufacturer of the furnace to provide the thermostat.
Amazon s choice for gas furnace thermostat.
The modulating thermostat outputs a pulse width modulated signal on its v terminal that controls the gas valve on the furnace over a 40 100 power range.
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Emerson 1e78 140 non programmable heat only thermostat for single stage systems.
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Imho it seems that a better architecture would be to have the thermostat become a very simple device and locate the smart controls for modulation at the furnace air handler.
It has an inbuilt schedule which you can use.
According to the thermostat manual amplitude of this signal is about 10 vdc frequency is 1 hz and the pulse width is variable 350 to 950 milliseconds in steps of 50 msec.
These have been available for a few years but now all of the major brands are making modulating furnaces.