View and download honeywell prestige iaq ythx9421 installation manual online prestige iaq ythx9421 thermostat pdf manual download. Thx9321 9421 prestige iaq and rf eim r install optional sensors if no sensors are used skip to section 7 to install outdoor air sensor 1 mount the sensor on a vertical exterior wall at least 6 inches below any overhang. Program the honeywell prestige 20 thermostat from anywhere in your home features interview based programming save on your energy bill today. System installation guide 69 2445efs 01 o thx9000 prestige iaq o wireless remote control o equipment interface module o wireless outdoor air sensor disconnect power before beginning installation can cause electrical shock or equipment damage 300 changeover manual
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