Description
The Lennox Y4033 Indoor Ambient Temperature Sensor is a thermistor assembly used to measure indoor air temperature and provide continuous input to the control board in HVAC systems. It operates by sensing normal room conditions and converting temperature changes into electrical resistance signals that the system uses for regulating heating and cooling cycles. It is used within the indoor unit, such as air handlers or furnace compartments, where it monitors return air or surrounding cabinet temperature. It is used to support a current temperature control, system modulation, and energy-efficient operation.
