Temperature Differential - Robertshaw 8425 User Manual

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
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
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
an F or C. Release buttons. Press the
the display.
2. Wait five seconds or press
ferential setting for 1
3. The display will read diFF.
Press the
differential up or down.
4. Wait five seconds or press
display will switch to the differential
setting for 2
5. The display will read diF2.
Press the
ferential up or down.
6. Wait five seconds or press
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
button to adjust the delay up or down.
buttons for three seconds. The display will flash either
stage heating and cooling.
st
or button to adjust the
stage heating and cooling.
nd
or button to adjust the dif-
stage is factory set at 1.0°F (.5°C).
st
stage is factory set at
nd
or
and the display will switch to the dif-
and the
and
or
9
button to switch