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Typical HVAC Behavior (No Device Installed)

The following graphs represent the typical behavior of a thermostat and different HVAC systems. These work together to provide temperature control in a room.

Signals from Thermostat to HVAC system:

— Compressor signal (C)— Fan signal (F)— Heater signal (H)

Note: When the compressor is turned ON, the Fan will always be ON.
Thermostats may apply a duty cycle, or a short cycle protection delay during use of the compressor.
In Heat Pump systems, the compressor provides heat or cool (depending on selected settings).

Signals from Thermostat to HVAC system:

— Compressor signal (C)— Fan signal (F)— Heater signal (H)

 

Signals from External Heating Source Connected to HVAC system in Gas Settings
– – – Fan Signal (F)

Note: When the compressor is turned ON, the Fan will always be ON.
Thermostats may apply a duty cycle, or a short cycle protection delay during use of the compressor.
In Heat Pump systems, the compressor provides heat or cool (depending on selected settings).

Signals from Thermostat to HVAC system:

— Compressor signal (C)— Fan signal (F)— Heater signal (H)

 

Note: When the compressor is turned ON, the Fan will always be ON.
Thermostats may apply a duty cycle, or a short cycle protection delay during use of the compressor.
In Heat Pump systems, the compressor provides heat or cool (depending on selected settings).