INSTRUCTIONS
TESTING THE NEW THERMOSTAT
WARNING!
• Do not switch the system to cool if the outdoor temperature is below 50°F (10°C). This may damage the cooling
system and may cause personal injury.
• This thermostat is equipped with automatic compressor protection to prevent damage due to short cycling.
The short cycle protection provides a 5-minute delay between heating (heat pump models) or cooling cycles
to prevent the compressor from being damaged.If the Heat/Cool icon is flashing, this indicates the system is
in the delay period.
1. Restore the system power. The LCD (liquid crystal display) will
alternately display the time and room temperature. The LCD will
illuminate at the touch of the red or blue arrow keys. LCD will
return to its normal state after 10 seconds.
2. Set the fan switch to the ON position. The system blower
should start.
3. Set the fan switch to the AUTO position. The system blower
should stop.
4. Set the system switch to the HEAT position and depress the red
arrow key until the temperature set point is at least 3 degrees
above the room temperature. The LCD will display a flame icon
to indicate the thermostat is activating the heating system. The
system should start within several seconds (the system blower
10
may not come on immediately).
Image shows display altering between time and a
room temperature of 70°
Image shows room temperature of 71° and Heat set
point of 75° as the display alternates every 3 seconds.