Shouldn't your algorithm have some hysteresis on the humidity too?
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The [A,B] isn't for hysteresis, it's just an acceptable/comfort range. Since there's never an operation to increase humidity, it doesn't need one.
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Although maybe if you lived in AZ you'd want logic to integrate with evaporative coolers to save energy. :-)
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Another design consideration you might need to consider is that some systems are designed to support simultaneous operation of heat & cooling functions for dehumidification even while heating.
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Yeah, I would assume systems designed for that are normally already setup with a thermostat/controller to make use of it, though, no?
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Sadly, there are a LOT of incompetent HVAC people pushing a lot of complex solutions terribly misconfigured.
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I totally believe it. I've never met one who wasn't pushing over-spec'd systems guaranteed not to dehumidify at all because they'll only run at 5-10% duty cycle.
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Yes, by far that's the biggest sin, and it sucks because it essentially guarantees that clammy feeling. On the bright side, it's such a big problem that the manufacturers have been implementing better internal sensors and variable speed blower fans to help compensate.
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I don't think the dumb analog version of that exists. I implemented essentially that logic using a Z-Wave thermostat and a Z-Wave controller with programmable logic.
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I don't think anyone's selling one, but it should be trivial to implement with the same sort of coils used in unpowered "millivolt" thermostats and a few transistors.
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