Equipment Interface Module controls up to 4-stages of heat and 2-stages of cool in a heat pump system and up to 3-stages of heat and 2-stages of cool in a conventional system. Three sets of Universal IAQ contacts to control humidification, dehumidification, and ventilation. Four sensor inputs for wired sensors or dry contact devices.

Features: Used with all THX9421R5021 Prestige® 2-wire IAQ thermostats and all versions of Prestige® IAQ thermostats and the VisionPRO® thermostats with RedLINK™ technology. Electrical Ratings: 18 to 30 Vac. Frequency: 50 Hz; 60 Hz. Stages: Up to 4 Heat / 2 Cool Heat Pump or Up to 3 Heat / 2 Cool Conventional. Electrical Connections: Screw terminals. Operating Humidity Range (% RH): 5 to 95% RH, non-condensing. Supply Voltage: 18 to 30 Vac. Operating Temperature Range: -40 C to 73.9 C (-40 F to 165 F).