Old Number THM5421R-1021

Used with all THX9421R-5021/U Prestige 2 wire IAQ Thermostats, all versions of Prestige IAQ Thermostats, and the VisionPRO Thermostats with RedLINK technology

3 heat and 2 cool stages for conventional systems - 4 heat and 2 cool stages for heat pumps

Three sets of Universal IAQ contacts to control humidification, dehumidification, and ventilation - Four sensor inputs for wired sensors or dry contact devices