9
desire by using or touch keys. Then, only the
indoor remote temperature reading will be used for
control.
26. Select Dual Fuel Feature Using Outdoor Sensor (dF)
– This feature is applicable only in heat pump modes and
with an outdoor sensor installed and enabled in step 25.
The thermostat will use the outdoor sensor temperature
to determine when to switch to gas heat and shut down
the compressor.
Select DF setting (dF) – dF default is 5. Select the
setting for outdoor temperature in the range of 5
o
to 50
o
.
When the outdoor temperature goes below the selected
temperature, the gas heat will begin.
Select Compressor Delay (Cd) – If dF is selected
higher than 5, after the auxiliary heat is turned on, the
compressor(s) shut down is delayed for the time selected
(in seconds). This delay is factory set to 60, but can be set
in the range of 0 to 99.
27. Select Auxiliary Off (AO) – Select the temperature that
will inhibit the auxiliary heating stage. As long as the out-
door temperature is above the selected temperature, the
auxiliary heat will not turn on. The default setting is 60°,
but can be set in the range of 35 ° to 80°.
28. Humidity Display (Hd) – Selecting HD On enables the
display to alternately show the current time and the hu-
midity. If HD is selected OFF, the display will not show the
humidity.
29. Adjustable Humidity Display – The display will show
the ambient humidity and 00 (default). The setting can
be changed from -20 and LO to 20 and HI. The displayed
humidity will change as the offset is changed. In Run
mode, the displayed humidity will be the ambient humidity
adjusted by the setting selected.
30. Auto Humidity Reduction (HR) – This feature au-
tomatically lowers humidity setting when the outside
temperature drops to prevent the interior windows/walls
from reaching the dew point where water condenses on
surfaces. This feature default is OFF. It can be changed
to select LO (low humidity reduction) or HI. To achieve
automatic humidity reduction, the thermostat lowers the
humidity when furnace cycles are long. When the outside
temperature rises, it increases humidity. "LO" indicates a
low amount of humidity reduction.
31. Automatic Humidifi cation (AH) – This feature if enabled
allows for humidifi cation independent of a call for heating
– useful in arid climates where addition humidifi cation in
heating and/or cooling is desired. If enabled, will energize
the humidifi er and circulator blower (“G” terminal and the
“HM” terminal) if the actual humidity is below the humid-
ity set point. The display indicates AH. Pressing the
key will cycle the display from OFF to H (feature enabled
in Heat mode) to C (feature enabled in Cool mode) to A
(feature enabled to Auto mode) and back to OFF.
32. Programmable Dehumidifi cation Optimal Comfort
Mode (OC) – This item can be selected to OC (Optimal
Comfort mode), or OFF. When Optimal Comfort (OC) is
enabled, this feature automatically reduces indoor humid-
ity with a call for Cooling if humidity is 2% above humidity
setpoint. Humidity is set by pressing the Humidity key
when in the appropriate mode, in this case Cooling, and
INSTALLER/CONFIGURATION MENU
pressing the or keys to set desired humidity (range
40% to 95%) level followed by pressing Humidity key
again. This dehumidifi cation feature uses less energy by
maintaining temperature and dehumidifying only when a
call for Cooling is required.
33. Select Change UV Lamp Time – This feature allows
the thermostat to display the words "Change UV Lamp"
(Call for Service of UV bulb) after a set time of UV bulb
operation. This is a reminder to maintain your UV system
at optimum level of operation. When enabled, the factory
set interval for "Change UV Lamp" to be displayed is 350
days of UV bulb operation and can be set between 25 to
1975 days in 25 day increments. This should be adjusted
with respect to the bulb’s recommended maintenance
schedule.
When "Change UV Lamp" is displayed, you can clear it
by pressing Clean Display.
34. Select Change Humidifi er Pad Time – This feature al-
lows the thermostat to display the words "Change Pad"
after a set time of humidifi er operation. This is a reminder
to maintain or clean your humidifi er. The factory set
interval for "Change Pad" to be displayed is 200 hours of
humidifi er operation and can be set between 25 to 1975
hours in 25 hour increments. This should be adjusted with
respect to the humidifi er’s recommended maintenance
schedule.
When "Change Pad" is displayed, you can clear it by
pressing Clean Display.
35. Select Change Filter Run Time – This feature allows
thermostat to display "Change Filter" after a set time of
blower operation. This is a reminder to change or clean
your air fi lter. This time can be set from 25 to 1975 hours
in 25 hour increments. A selection of OFF will cancel this
feature. When "Change Filter" is displayed, you can
clear it by pressing Clean Display. In a typical application,
200 hours of run time is approximately 30 days.
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