Install Instructions

42
indoor variable speed motor to the
dehumidification speed and cycle Y2 ON to the
outdoor unit. Cooling has priority over Humiditrol
®
calls. Humiditrol
®
mode is allowed to over cool up
to 2ºF above the heating set point.
Heat only—Thermostat will cycle heating ON and
OFF to maintain heating set point.
Dehumidification functions are disabled.
Heat/Cool—Dehumidification will only occur if a
dehumidification demand is present, a cooling
demand is not present, outdoor temperature is
less than 95ºF, indoor temperature is above 65ºF
and the indoor temperature is not cooler than 2ºF
above heating set point.
Note: If the last thermostat demand was a heating
demand, the thermostat does not require a cooling
demand before Humiditrol
®
operation.
Humidity Sensor Fault
If the humidification sensor fault occurs, then the H
terminal becomes inactive, and the D terminal
goes to 24VAC.
Dew point adjust is only available when an outdoor
sensor is attached.
Other Humiditrol
®
EDA Notes
If the outdoor sensor is disconnected while
HUMIDITROL is enabled, the thermostat will not
allow operation in dehumidification mode.
Set point range: 45 to 60% Relative Humidity
(RH). Factory default - 50%.
Relative Humidity controls to within 2% on either
side of RH set point.
When the “D” terminal is activated with 24VAC,
dehumidification is inactive.
NORMAL, MAX and HUMIDITROL modes are
disabled by default from the factory.
As a precaution, regardless of how low the heating
set point has been set, Humiditrol
®
dehumidification is inhibited below 65ºF indoor
temperature.
Unit Part (Catalog) & Serial Numbers
A label on the back of the thermostat is visible
through an opening in the back of base plate. This
identifies the Lennox Catalog Number, Part