Carrier PTACSTAT-NP-HP - Manual (Page 21)

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during your heating and cooling cycles (auto mode, sometimes known as cycle
mode).
The thermostat is set at the factory to run automatically as needed (auto). Here’s
how to change the setting so it runs continuously.
1. Press the fan button on the left. The display message will change from
auto fan to fan on.
2. To return the fan to auto mode, press the fan button again. You will see
fan auto on the display.
Using emergency heat (heat pump units only)
Emergency heat is useful when the automatic auxiliary heat system can’t keep up
with demand. (Units with heat pumps use “auxiliary heat” when it’s too cold
outside for the heat pump to heat the space. The display indicator for this is aux
heat on.)
Here’s how to set your thermostat to use emergency heat.
1. Press the mode button repeatedly until you see Em heat in the upper left
of the display.
2. To turn off emergency heat, press the mode button again to select heat,
cool or off.
Turn the unit off
To use the thermostat to turn off the heating and cooling system, press the mode
button on the left repeatedly until the display shows off in the upper left.
Installing or replacing the batteries
NOTE: Remember, batteries are only required if there are not enough wires to
connect a common wire.