Lennox CS7500 User Manual

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In this case, 24VAC is removed from the D terminal
and Y1, Y2, and Y3 terminal (if available) becomes
activated with 24VAC. This cycles the indoor vari-
able speed motor to the dehumidication 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. Dehumidication
functions are disabled.
Heat/Cool - Dehumidication will only occur if a
dehumidication demand is present, a cooling de-
mand 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 humidity sensor fault occurs, the thermostat
shuts o󰀨 dehumidication.
Other Humiditrol
®
EDA Notes
If the outdoor sensor is disconnected while HUMID-
ITROL is enabled, the thermostat will not allow oper-
ation in dehumidication mode.
Set point range: 45 to 60% Relative Humidity (RH).
Factory default - 50%.
Relative Humidity controls to within 3% on either
side of RH set point.
When dehumidify mode is in NORMAL or MAX or,
HUMIDITROL, “D” terminal works in reverse logic.
NORMAL, MAX and HUMIDITROL modes are dis-
abled by default from the factory.
As a precaution, regardless of how low the heating
set point has been set, Humiditrol
®
dehumidication
is inhibited below 65ºF indoor temperature.
Economizer
Economizer control means that for every period in
the day that the unit is in occupied mode, the occu-
pancy out Ec (relay output) shall be energized when-
ever there is a demand for fan (G is active).
The thermostat does not directly control the damp-
er position. The output from the thermostat will be
wired to an economizer controller or a unit controller
which will control the position of the damper.
E󰀨ective
Occupancy
Call for Cooling Terminal EC
State
Occupied -
Unoccupied Yes De-Energized
No De-Energized
Override - Energized
Table 3. Terminal Ec Operation

Lennox CS7500 Specifications

General

Brand	Lennox
Model	CS7500
Category	Thermostat
Language	English