Where is the temperature sensor located that maintains desired discharge temperature on a make-up air unit?

The temperature sensor maintaining the desired discharge temperature on a make-up air unit is located after the burner in the supply air. This positioning is crucial because it allows for accurate monitoring of the air temperature immediately following the heating process. By placing the sensor after the burner, the system can effectively regulate and adjust the heating output based on the actual temperature of the air that is being supplied to the space.

This ensures that the air delivered to the environment is at the right temperature, contributing to energy efficiency and maintaining comfort levels. The control system can respond to real-time temperature readings, making it possible to modulate the burner operation as necessary.

Positioning the sensor before the burner would fail to capture the effects of the heating process, while placing it on the outdoor coil or in the compressor unit would not be relevant to monitoring the discharged air temperature, further highlighting why placing it after the burner is the most effective approach.