Operation - Friedrich RT4 Installation, Operation & Application Manual

Setting the Room Temperature (Setpoint Temperature)
Step 1: Press the
or
Step 2: Press the or
The new temperature setting is automatically saved. After 5 seconds, the display returns to showing the current
room temperature.
Setting a New Temperature Differential
The default temperature differential is 1°. When your room temperature varies by 1°F, the thermostat turns on your
system. If you notice your system turning on and off too frequently, increase the temperature differential.
Step 1: Remove the cover and press the Reset button once.
Step 2: For the first 10 seconds of operation, the temperature differential is displayed.
Press the or
Changing Fahrenheit to Celsius
The temperature displays in degrees Fahrenheit as a factory set default. Follow these steps to change to degrees
Celsius:
Step 1: Remove the cover.
Step 2: Move the F/C jumper to the desired position, F or C using the center pin as a common.
Step 3: Press the Reset button once and reinstall the cover.
Your LCD readout changes accordingly.
Starting the Thermostat
Step 1: Move the Fan Auto/On switch into the Auto position.
Step 2: Move the Mode switch to Heat or Cool, depending on the season.

Operation

button; the current temperature setpoint displays.
button until the desired temperature setpoint displays.
button to select desired setting.
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