@dfmedding ,
The nest thermostat has multiple sensors in the display unit that calculate Humidity and Ambient Temperature. When it comes to a dehumidifier, did you properly wire the dehumidifier to the air handler? An air conditioner is by its nature, a dehumidifier, when the air conditioner is running the moister in the air is condensed on to the cold evaporator coil and the water is drained to the outdoors. If your handler has multiple speed fan, and the integrated furnace control (IFC) has multiple fan speed terminals, the Nest can be used to slow the fan down and increase the dehumidification rate.
Now, let us talk about your AprilAire E100. The E100 is wired to the IFC using the Y wire. The E100 has an internal compressor (an air conditioner) that is turned off when the house air conditioner is running. When the house air conditioner is not running and the E100 humidistat calls for dehumidification, the internal compressor is started and dehumidifier continues to operate until the humidity is lowered to the setting on the built in humidistat. The G wire from the Nest thermostat should be disconnected in the air handler, and connects to the Gs terminal on the E100 control board. The Gh terminal on the control board is routed to the furnace control board G terminal. This makes the E100 the primary controller of the blower fan. Thus, when the house air conditioner is satisfied or other not running, the E100 can keep the blower fan running so it can continue to dehumidify the air. So, why do you think the Nest Thermostat is doing something wrong when the E100 is the controller of the blower fan and its own humidistat is the moister controller? If you want the Nest to control the E100, you must wire the Nest Learning Thermostat * terminal to the E100 control board along with a common wire.
AC Cooling Wizard
NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.
