I have an Emerson thermostat that claims to have a feature called cool
I tried to Google this feature and Emerson says its designed to adjust
the programmed set point temperature during high demand use of a central
air conditioner. I think they mean that the thermostat will call on the
variable speed fan/ECM fan will blow faster to similate cooler air,
without the compressor running all the time, but that's just my guess
I can't really get any more information other than that.
IU've only had this blower unit/furnace and thermostat for 4 months so
no history with it. Today was first day using the aircond (A coil and
compressor unit are 14 years old,)
Anyone care to explain what this feature is and how it works? Emerson
Sorry I cannot help as I have never seen this thermostat or heard of it
I would be very interested in seeing just how it does this.
There are various ways of saving power, one is to cycle the fan with the
compressor, another is to raise the set point of the thermostat when the
outdoor temperature gets very high to lessen the big difference between the
indoor and out door temperature so you do not get hit with a chilled
temperature when entering from a very hot outdoor temperature. On
installations I have seen with the later they had an outdoor sensor to set
up internal thermostat.
In most cases on homes that would not be much help as the size of the air
conditioning unit would not allow the indoor temperature to be so different
to the outdoor temperature.
Here the design outdoor temperature is 90 f and most people would have an
indoor design of 75 f, IE a 15 degree difference between inside and outside,
so all things being equal if the outdoor temperature rises to 93 then the
indoor temperature would also get to 78.
This is of course in theory, in fact if the outdoor temperature gets above
the design there are factors that my not get the indoor temperature above
the design, IE how long it takes the extra heat to get though the walls and
ceilings, and how long the outdoor temperature is above the design
On things like shopping centres that use a lot of power I know that they
will reduce the capacity of the compressor by raising the chilled water
temperature if the whole buildings power become too great This is mainly
done with centrifugal or screw chillers, not house units.
They do this because in some cases their electricity charges are controlled
by a maximum demand meter and if they exceed the maximum demand then the pay
more for all the power for the whole billing period, hence they control the
power usage by raising the chilled water temperature to lower the power
All of these methods have their pros and cons.
Remember one thing that companies make thermostat to work with many
different units or Manufactures equipment, so what I am trying to say even
you may have those commands on your Tst. that does not mean that your unit
have those capabilities similar as dance it takes two to tango.
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