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The Resideo YTHM5421R1010/U is an advanced equipment interface module kit designed for intelligent heating, cooling, and indoor air quality management. This module controls up to four stages of heat and two stages of cool in heat pump systems, and up to three stages of heat in conventional systems. It features three sets of universal IAQ contacts for managing humidification, dehumidification, and ventilation tasks.
This interface module kit is suitable for use with all versions of Prestige IAQ thermostats and the new RedLINK VisionPRO thermostats.
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