Carrier HH79TZ039 Thermister

The Carrier HH79TZ039 is a thermistor, a small but essential device used in different Carrier HVAC units. It is a crucial component in controlling system functions. Thermistors are special resistors which differ from classical thermometers in that their electrical resistance depends on the temperature. In Carrier HVAC systems the thermistor is usually located in positions that allow it to measure temperature inside the system. Its resistance increases with decreasing temperature and decreases with increasing temperature. Fluctuation in the resistance indicates to HVAC control board regarding the conditions of heating and cooling systems like the compressor and the fan.