Systems that include FE4 and FE5 fan coils do not use 24 VAC signals to communicate system operation commands. System control is accomplished through computer level commands on a system "bus" that requires fewer low voltage interconnecting wiring. System components that are not capable of communication through this bus require an interface kit. This kit provides interface of the FE4 and FE5 fan coils with Hydronic Heat equipment.
Totaline Hydronic Relay Interface Kit, Accessory Type: Hydronic Relay Interface Kit, For Use With: Infinity Series FE4A/FE5A Communicating Variable-Speed Fan Coil