Air temperature sensor for the negative temperature coefficient thermistor, referred to as NTC, its resistance decreases with increasing temperature, with the increase of .25 ? temperature decreases resistance when the nominal value. NTC common fault for the resistance change large, open, damp mildew resistance changes, short circuit, poor contact with the plug and seat, or leakage, etc. CPU detection terminal voltage caused by air conditioning failure caused abnormal.


Central role of indoor temperature NTC: NTC temperature indoor ring set work according to the state, testing the temperature of the indoor environment automatically open stop or frequency. Fixed-frequency air temperature difference between indoor temperature range is set value +1 ?, that if the cooling set 24 ?, when the temperature dropped to 23 ? compressor shutdown, when the temperature rose to 25 ? compressor; if it set the 24 ? heating, when the temperature rose to 25 ? compressor shutdown, when the temperature dropped to 23 ? compression machine work.

 

Worthy of note is the temperature setting range is generally between 15 ? -30 ?, the temperature below 15 ? in the ring does not work under refrigeration, higher than the environmental temperature under 30 ? heating does not work.

 

Inverter air conditioner according to set temperature and indoor temperature difference for frequency control, the greater the difference between the higher frequency of the compressor, so the compressor starts soon after the speed upgrade.

 

NTC Indoor indoor coil cooling cold plate control (less than +3 ?) Protection of detection, lack of fluorine refrigerant detection; heating against the cold wind blow, over-temperature protection test.

 

30 minutes of air conditioning automatically checks the temperature of indoor coil, if the temperature reach 20 ? are automatically diagnosed as lacking fluoride and protection. If for some reason indoor coil temperature dropped to +3 ? also shut down following anti-frost ( cold) when the indoor coil heating temperature within the fan base at 32 ? without hair (anti-cold), higher than 52 ? outside the fan stops and the compressor stall higher than 58 ? (overheating); some air-conditioning heating automatic within the fan speed control; some air conditioning automatically switches frequency electric-thermal speed control, air conditioning.

 

Outdoor coil defrost NTC temperature sensing heating, refrigeration condensing temperature detection. Defrost heating heat pump machine is an important feature, the first frost for the CPU time (usually 50 minutes), after the frost from outdoor coil NTC control (typically -11 ? to defrost, +9 ? while heating). refrigerant condensing temperature of 68 ? stop the compressor to replace the role of high-pressure pressure switch; frequency cooling coil is reduced frequency to prevent continued warming. Outer Ring NTC temperature control of outdoor fan speed, compressor warm in winter. exhaust NTC to lower frequency inverter compressor to avoid overheating of foreign machines, lack of fluoride detection.

 

NTC control refrigerant suction flow control throttle to achieve a stepper motor. Failure Analysis: NTC indoor and outdoor coil failure rate of the highest variety of fault phenomena. Indoor coil is located at NTC as the ever-changing and the condensation temperature or high temperature conditions, so its broken. mainly in the power supply while the machine is not working properly, stop short of work, heating outside the plane when the fan is not operating within the normal, outside fan does not work or Yichang stop switch, compressor does not start, poor frequency effects, frequency does not work, heating and other non-defrosting. defrost failure can be substituted Outdoor NTC or outdoor coil defrost board.

 

Air power is not working properly and also check when the indoor ambient temperature NTC; air conditioning working non-stop or fail to set the temperature down, it must first check indoor ring temperature NTC; inverter air conditioner not working properly and it will be relevant. Because indoor ambient temperature NTC will make the CPU if it fails misjudged the indoor ambient temperature caused by malfunction. indoor ring failure rate is not very high temperature NTC.

 

       Common indoor air ring temperature NTC NTC, indoor coil NTC, NTC in three outdoor coil, the air conditioning was also applied over the outer ring high temperature NTC, compressor suction, exhaust NTC so. NTC in the circuit in the main two kinds of usage, NTC resistance to changes in temperature, CPU voltage terminal of the shift, CPU voltage changes according to the work to determine the status of air conditioning.