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Step 4: Customizing the Thermostat
♦ Settings
System
Cool: The thermostat controls the cooling.
Off: The heating and cooling systems are off.
Heat: The thermostat controls the heat.
Emer:The thermostat controls the second stage emergency heat. Use
only when the primary stage of heat is not functioning or requires
service. The display will show CHECK HP
when the heat pump requires service.
Fan
Auto:Equipment controls the fan.
On: The fan operates continuously.
♦ Temperature Differential
The temperature differential for 1
st
stage is factory set at 1.0°F (.5°C).
This means that whenever the room temperature changes by one
degree Fahrenheit from the temperature setting, the system will turn on.
If the system turns on too often, increase the temperature differential.
NOTE: The temperature differential for 2
nd
stage is factory set at
2.0°F (1.0°C)
♦ Changing Fahrenheit (°F) to Celsius (°C),
the Temperature Differential, and
the Filter Monitor
1. The thermostat is preset to display the
temperature in degrees Fahrenheit (US
models) or degrees Celsius (Canadian
models). The temperature display can be
changed. Press and hold both the
and buttons for three seconds. The display will flash either
an F or C. Release buttons. Press the or button to switch
the display.
2. Wait five seconds or press and the display will switch to the dif-
ferential setting for 1
st
stage heating and cooling.
3. The display will read diFF.
Press the or button to adjust the
differential up or down.
4. Wait five seconds or press and the
display will switch to the differential
setting for 2
nd
stage heating and cooling.
5. The display will read diF2.
Press the or button to adjust the dif-
ferential up or down.
6. Wait five seconds or press and
the display will switch to the
differential delay.
7. The display will read dLY2.
The differential delay is the length of time
(in minutes) from when the 1st stage
engages, until the 2nd stage engages to
assist in heating or cooling. Press the or
button to adjust the delay up or down.
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