A humidistat only requires two wires, it is a simple switch that opens or closes by a length of plastic that changes length as it absorbs or gives off moisture from/to the air. The 46C or E are for dehumidification as the switch connects on a rise to the set point. The 46C has the two wires and is the least complicated to wire. The H600A, H808C are also used that accept line voltage or less. The H8808C is for low voltage only. Any of these will do the job for dehumidification.