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.

ApplicationGas, oil, electric, heat pump, forced warm air, hot water, steam or gravityDimensions (in.)9 5/16 in. High, 4 13/16 in. Wide, 1 5/8 in. DeepDimensions (mm)237.4 mm High, 122.5 mm Wide, 40.6 mm DeepIncludesTHM5421R1021 Equipment Interface ModuleUsed WithAll THX9421R5021 Prestige® 2-Wire IAQ Thermostats and all versions of Prestige® IAQ Thermostats and the VisionPRO® Thermostats with RedLINK™ technology.Item TypeProductMountingVerticalElectrical Ratings18 to 30 VacFrequency50 Hz; 60 HzStagesUp to 4 Heat / 2 Cool Heat Pump or Up to 3 Heat / 2 Cool ConventionalElectrical ConnectionsScrew terminalsOperating Humidity Range (% RH)5 to 95% RH, non-condensingSupply Voltage18 to 30 VacOperating Temperature Range (F)-40 F to 165 FOperating Temperature Range (C)-40 C to 73.9 CPower MethodHardwiredColorGrayTerminal DesignationsR, RC, RH, C, W-O/B, W2-AUX1, W3-AUX2, Y, Y2, G, A-L/A, U1, U1, U2, U2, U3, U3, S1, S1, S2, S2, S3, S3, S4, S4, A, B, C, DCool Current1.0 A runningHeat Current1.0 A runningFan Current0.5A running