Humidify; Normal & Max; Dew Point Normal & Max - Lennox ComfortSense 7500 Installation And Setup Manual

Humidify

Humidification (adding moisture to air) is provided
only when the thermostat is in heat mode. The
humidification signal (H terminal) to the humidifier
(off when the thermostat is in the COOL mode)
controls humidification. When the thermostat is
powered, the H terminal is normally inactive (open
circuit) in any mode (HEAT/COOL, HEAT, COOL,
OFF). When a humidification demand is present,
H terminal and G terminal are energized (24V).
A selection option under Installer settings >
Humidity settings > Humidify > Humidify mode
must be enabled before the user will have control
over the humidity. The humidity mode selected
determines how the user can adjust the relative
humidity (RH). The installer settings include
NORMAL, MAX, DEW POINT NORMAL, DEW
POINT MAX, and OFF.
NORMAL & MAX
These thermostat modes allow the user to control
the relative humidity (RH) between 15 and 45%.
The following conditions must be met for either
mode to operate:
S humidification mode has been enabled, and
S the unit is in HEAT mode, and
S humidification demand exists (24V present at
H)
Additionally, the NORMAL mode requires heat
demand exists (Y energized for heat pump
heating, or W energized for gas heat [W may be
energized with G de-energized]).
DEW POINT NORMAL & MAX
Dew point adjustment mode will change the
humidification set point based on the outdoor
temperature and a user-defined dew point
adjustment setting.
NOTE - In dew point adjustment mode, the
humidification set point has no effect whatsoever
on unit operation. Only the user-defined dew point
adjustment setting affects operation per the
following formula:
37