Lennox ComfortSense 7500 Installation And Setup Manual page 29

A selection option under Installer settings >
Humidity settings > Dehumidify > Dehumidify
mode must be enabled before the user will have
control over the humidity. The mode selected
determines how the user can adjust the relative
humidity (RH). The installer settings include:
1. NORMAL
2. MAX
3. RTU/AUX DEHUMIDIFIER
4. HUMIDITROL
5. OFF
NORMAL
In this mode, dehumidification occurs if these
conditions are met and signals are present at
specific terminals:
1. Dehumidification has been enabled on
installer settings, and
2. Unit is in COOL mode
3. Dehumidification demand exists (RH above
set point)
4. Cooling demand exists (Y1 energized).
MAX
In this mode, dehumidification occurs if all
maximum conditions are true, except cooling
demand may or may not be present. Maximum
over cool from cooling set point is 2ºF.
RTU/AUX DEHUMIDIFIER
When dehumidify mode is in "RTU/AUX
dehumidifier", "D" terminal works in active logic.
The RTU/Aux dehumidifier setting is used with
RTU with rooftop units only when a dehumidifier is
used for dehumidification. This requires:
1. Dehumidifier has been wired to thermostat
per dehumidifier installation instructions.
2. Dehumidification has been enabled on
installer settings.
3. Unit is in COOL mode, (or if in AUTO, there
has been at least one thermostat cooling call
made prior to the dehumidification demand)
4. Dehumidification demand exists (RH above
set point).
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