I have read various posts of people with similar problems but I cannot get my IAQ to succsessfully use my A/C to dehumidify. I have ...
Furnace: Carrier 58PAV135-20 series 151 (single stage)
A/C: Carrier 38CKB060300 (single stage)
Humid: April Aire 600 [currently not connected in order to simplify setup pending resolution of dehumid problem]
First off, I have no experience wiring this level of complexity tstat, but with such a basic setup, I figured there would be little problem.
My IAQ is set to fan(auto) and system(auto) with dehumid set to 45%. The heat temp is set to 65 and cool to 77. The current indoor humidity has been between 60-70% all day and the A/C will kick in reducing the indoor temp to 3 degrees below the cool setpoint (as per setup function 0383 I assume) but will not continue cooling to reduce the humidity.
What strikes me as odd is that on the dehumid screen, the AUTO/OFF option is present ... even though setup function 0379 (dehumid control) is set to 1 (dehumid with AC). The Operating Manual (p18) specifically indicates that AUTO/OFF option is only present when using a whole house dehumid and is not present when dehumidifying with the AC.
For clarity, I have the AC wired to Com and Y only, not DHM.
Any and all help is greatly appreciated.