Robertshaw 8425 User Manual download pdf (Page 9)

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

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

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

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

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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Robertshaw 8425 User Manual Page 9

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