C - A 22
TCONT900AC43UA Installer’s Guide
4 Heat/3 Cool/ Heat Pump
Communicating Programmable 3-Wire Hookup
(A/T)CONT900AC43UA Installer Guide
to factory defaults in Auto-Discovery mode.
Wait indicator
“Wait” will be displayed when the setpoint is changed
in the direction of calling for additional system ca-
pacity or the outdoor unit is in Charge Assist™ mode.
“Wait” indicates system time delays are being en-
forced, and the control is adjusting to the new set-
ting.
Calibrate indoor temperature
This option allows calibration of the room tempera-
ture sensor. The selected number is number of de-
grees, plus or minus, which will be added to the ac-
tual temperature. The number can range between
+3 and -3 degrees in one degree increments. Fac-
tory default is zero. The adjusted value will be used
as the temperature for both display and control ac-
tion.
Calibrate indoor humidity
This option allows calibration of the indoor humidity
sensor. The selected number is percent relative hu-
midity, plus or minus, which can be added to the ac-
tual indoor humidity. The number can range between
+5 and -5% in one percent increments. Factory de-
fault is zero. The adjusted value will be used as the
humidity for both display and control action.
Outdoor temperature sensor
For accuracy, the initial reading of the outdoor tem-
perature sensor requires five minutes to stabilize.
See the Sensor Instructions for installation informa-
tion.
If the device is using an outdoor sensor for control
and the outdoor temperature sensor becomes un-
available, the display will show dashes “--” and gen-
erate an Alert. If the device is not using an outdoor
sensor for control and the outdoor temperature sen-
sor becomes unavailable, no outdoor value will be
displayed. The Comfort Control will not send an Alert.
Humidification
Indoor humification control
This feature helps to control the indoor humidity to the
user’s humidification setpoint using a humidifier. The
humidification setpoint can range between 10% and
60% in 5% increments. When enabled, the default
humidification setpoint is 50%.
Frost control
The Frost control requires an outdoor sensor and a
humidifier. The Comfort Control calculates the pos-
sibility of condensation or frost forming by using the
outside temperature and inside temperature to de-
termine the dewpoint. When the dewpoint could
cause frost or condensation, the humidification re-
quest will not be honored.
The Frost control can be accessed by pressing the
More key until the Frost setting is displayed on the
screen. It has a value range of zero to ten, with zero
representing glass with poor insulation and ten rep-
resenting glass with perfect insulation. If the factory
setting results in too much condensation or frost on
the windows, lower the setting. When the air seems
too dry, raise the setting.
Dehumidification
Integrated temperature and humidity control
(ITHC)
The dehumidification control helps to control the in-
door humidity to the user’s dehumidification setpoint
by running the compressor. The dehumidification
setpoint can be accessed by pressing the More key
until the dehumidification setpoint is displayed on the
screen. The setpoint can range between 40% and
80% in 5% increments. When enabled, the default
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