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Originally Posted by joe1234  I guess I am confused with the entire dehumidification process and who (thermostat or furnace) makes the call? |
Both. Assuming a top notch IAQ stat, the stat directs the Furnace control board to run the Furnace Fan and A/C in Cooling Mode or DEHUM Mode.
First thing the A/C works on is humidity before working on sensible temp.
When Jay had His system at 72 the unit worked so much to get to set point humidity wasn't a problem by the time the stat was satisfied.
These days, Jay's system is looking at a Cooling call and a DEHUM call. Cooling gets handled first so his system starts in cooling until that is satisfied.
When that happens and there is still a call for DEHUM the system slows the fan down (Trying not to over cool the house) with the A/C (outdoor unit) still running.
Slowing the fan down also allows the air to stay in contact with the now colder coil longer and condense more moisture faster.
Make sense?