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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Edge thermostat cool to dehumidify doesn't work. Option 19

Customer Question

Edge thermostat cool to dehumidify doesn't work. Option 19 is set to D2. Fan is variable speed. With a humidity set point of 46 and RH=56% unit doesn't turn on. It's a 3 year old Carrier fan coil unit set up by the Carrier installer.
Submitted: 1 year ago.
Category: HVAC
Customer: replied 1 year ago.
Please put this on hold. I need to make some voltage measurements.
Expert:  Phil replied 1 year ago.

OK... just post back whenever you need to.

Customer: replied 1 year ago.
Just wanted to be sure there was 24vac at the D1 terminal. Also there was 39 vac at D2 while running in cool. I don't know about that. I have the installer's manual and all seems properly wired. I don't know if jumper J1 in the fan coil unit was removed which is supposed to happen if one wants the unit to dehumidify. I doubt the cool to dehumidify feature has ever worked as we have had mildew on leather and other items when we return to our Florida home in October after a summer up north even with the humidity limit set point at 54%.
Expert:  Phil replied 1 year ago.

Hello, I am going to need the complete system wiring diagram to be able to help you with this online.

If you can get me the thermostats full model number I might be able to get what I need from there.