To Select Humidification (Programmable); Additional Humidify Comments - Carrier Performance TP-PRH-A Installation Instructions Manual

2. Auto Humidify
Thermidistat Control will automatically adjust the humidity setpoint accord-
ing to the outdoor temperature. As the outdoor temperature decreases, the
humidity setpoint also decreases. Settings ranging from 1 to 9, 1 being the
lowest and 9 the highest, will be visible to the homeowner. See Fig. 18 for
outdoor temperature/indoor humidity relationship in auto humidify mode.
Outdoor Air Temperature Sensor must be connected.
3. Humidify Off
The humidify function can be turned off completely. This does not require
changing existing setpoints.

To Select Humidification (programmable)

Press the soft key below the humidify icon to bring up humidity select screen.
Humidify options are only available when in Heating mode. When system is in
AUTO mode, humidify options are available if the last system operation was a call
for heat.
To Select Humidification (non- - programmable)
Press the features button twice. The first press displays the outdoor air temperature
and the second press displays the humidity value and humidify target.
Pressing the mode button shall cycle through the available humidification selections
(Off, Humidify and Auto Humidify).

Additional Humidify Comments

The humidifier is actually turned on when humidity is 1% below setpoint and
turned off when it reaches 1% above setpoint. This built- - in hysteresis prevents
humidify output from toggling on and off when humidity level is near setpoint.
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