Honeywell Prestige IAQ YTHX9421 - Indoor Sensor Operation and Configuration; Temperature Control Sensor Selection; Humidification Control Sensor Selection; Dehumidification Control Sensor Selection

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Indoor sensor operation
Mounting an indoor sensor
1 Remove the wallplate and mount
it 4 to 6 feet above the floor on an
interior wall. Drill 3/16-inch holes for
drywall, 7/32-inch for plaster.
2 Attach sensor securely to wallplate
as shown.
Temperature control
The thermostat can be set to respond to its
internal temperature sensor, or to an optional
remote indoor sensor. If multiple sensors are
selected, the thermostat will respond to an
average of temperatures detected at each
sensor.
Humidication control
If optional remote indoor sensors are
installed, you can choose which sensor you
wanttouseforhumidicationcontrol.You
can use a different sensor for
dehumidication.
Dehumidication control
If optional remote indoor sensors are
installed, you can choose which sensor you
wanttousefordehumidicationcontrol.For
example, you can use one sensor for
humidicationcontrol,andanotherfor
dehumidication.