Lennox ComfortSense 7500 Commercial - Detailed Dehumidification Modes; Normal Mode Dehumidification; Max Mode Dehumidification; RTU;Aux Dehumidifier Mode

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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).
Humiditrol
®
This setting is for commercial split systems only. If
Humiditrol is enabled in the installer settings, then
this adjustment affects overcooling operation.
Overcooling ranges from 2ºF below the cooling
setpoint (MIN setting) down to 2ºF above the heating
setpoint (MAX setting). Halfway between the two
settings is the MID setting.
If a Humiditrol
®
EDA is installed and enabled, then
the thermostat must be configured to properly
operate the Humiditrol
®
EDA as follows (see Figure
15 for the Humiditrol
®
EDA operation flowchart):
Check the HUMIDITY SETTINGS in user settings to
confirm that the user has turned ON
dehumidification setting.
NOTE - Humiditrol
®
EDA operation requires use of
an outdoor sensor. If sensor is not connected and
Humiditrol
®
EDA is enabled, “OUTDOOR
SENSOR REQUIRED” is displayed in the
information display.
Cooling only—Dehumidification will only occur if:
1. Dehumidification demand is present,
2. Cooling demand is not present,
3. Outdoor temperature is less than 95ºF,
4. Indoor temperature is not cooler than 65ºF or
cooler than the heating set point + 2ºF (IF the
difference between cooling and heating set
points is greater than the deadband).