Honeywell
Honeywell YTHM5421R1010 RedLINK Equipment Interface Module, 2 Sensors
$109.99
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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.