Dehumidify - Lennox ComfortSense 7500 Installation And Setup Manual

Rh
=
set point
RH
Where:
user dew point adjustment
Rh
setpoint
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 the above formula.

Dehumidify

Dehumidification (removing moisture from air) can
occur only when the thermostat is in cool mode.
When a dehumidification demand is present, a
dehumidification signal (0VAC - open circuit) is
present at the D terminal. This is used to reduce
Outdoor Temp (ºF)
2
cannot exceed +/-15% and
minimum is 15% and cannot exceed 45%.
the speed of
dehumidification. At the same time, the Y1 and Y2
(if available) terminals become activated with
24VAC. The H terminal is inactive (0VAC - open
circuit) during dehumidification.
System must be in cool mode and had one call for
AC before feature is active. Once dehumidification
is active the dehumidification modes are as
follows:
S Normal: Runs dehumidification with a call for
cooling and dehumidification.
S Max: Runs dehumidification with a
dehumidification call but without a call for
cooling.
S Auxiliary Dehumidifier: Runs based on
humidity reading from thermostat's internal
humidity sensor and will call for
dehumidification using the auxiliary
dehumidifier (whole house dehumidifier).
39
RH
user dew point
+ 25 +
adjustment
the indoor blower during