Questions:
[ul]
[li]What temperature is set to 24C? the supply temperature or the room temperature?[/li]
[li]Are all pieces of equipment operational?[/li]
[li]what is LAT off FCU?[/li]
[li]Where is the FCU pulling from?[/li]
[/ul]
possible issues:
[ol 1]
[li]FCU could be malfunctioning, either not blowing or cooling. Either of these would allow room humidity to rise.[/li]
[li]FCU could be pulling from a location with high RH but low DB temperature, this would mean that a temperature based control for FCU cooling coil will do nothing to cut down humidity. (try lowering the temperature set point)[/li]
[li](unlikely) Fan could be spinning wrong way and pushing humid air into space? bathroorm and surrounding areas would be smelly if this is the case.[/li]
[/ol]