The TEC3000 thermostat supports dehumidification control on fan coil devices under three configurations:
- Four-pipe fan coil
- Four-pipe fan coil with reheat
- Two-pipe fan coil with reheat and changeover valve that allows cooling
Dehumidification operates when the zone humidity increases above the humidity setpoint and the thermostat is in a satisfied state with no active call for cooling or heating and when the chilled water temperature is low enough to provide dehumidification. When dehumidification is active, the cooling device controls to the humidity setpoint, and the heating device reheats the zone in order to keep the temperature at setpoint. When in dehumidification mode, the multi-speed or variable-speed fan operates at the appropriate speed to maintain balance between maximizing condensation and moisture removal and keeping the zone from overcooling.