Carrier 42UQV050M Service Manual

Also see for 38UYV050M Series: Owner's manual Installation manual

Contents

– 31 –Item4. CapacitycontrolOperation flow and applicable data, etc.The cooling or heating capacity depending on the load isadjusted.According to difference between the setup value of tempera-ture and the room temperature, the capacity is adjusted bythe compressor revolution.Description1) The difference between settemperature on remote controller(Ts) and room temperature (Ta)is calculated.2) According to the temperaturedifference, the correction value ofHz signal which determines thecompressor speed is set up.3) The rotating position and speedof the motor are detected by theelectromotive force occurred onthe motor winding with operationof the compressor.4) According to the differenceresulted from comparison of thecorrection value of Hz signal withthe present operation Hz, theinverter output and the commuta-tion timing are varied.5) Change the compressor motorspeed by outputting power to thecompressor.* The contents of controloperation are same in coolingoperation and heatingoperationThis function prevents troubles on the electronic parts of thecompressor driving inverter.This function also controls drive circuit of the compressorspeed so that electric power of the compressor drive circuitdoes not exceed the specified value.5. Current releasecontrolSet temp. (Ts) Room temp. (Ta)Correction of Hz signalOutdoor temp. ToSetup of current release pointCapacity control continues.Detection of electromotive forceof compressor motor windingDetection of motor speed and rotor positionInverter output changeCommutation timing changeChange of compressor speedRemote controller Indoor unitTs –TaCurrent decreaseCorrection value of Hz signal ≤ Operating HzOutdoor unit inverter maincircuit control currentHighLowReduce compressor speedOperating current ≤Setup value1) The input current of the outdoorunit is detected in the invertersection of the outdoor unit.2) According to the detectedoutdoor temperature, thespecified value of the current isselected.3) Whether the current valueexceeds the specified value ornot is judged.4) If the current value exceeds thespecified value, this functionreduces the compressor speedand controls speed up to theclosest one commanded from theindoor unit within the rangewhich does not exceed thespecified value.Cooling current release value Heating current release value8.77A 10.88A4.88A 7.05A6.15A 9.30A8.02A 10.50AOutdoor temp.45°C40°C16°C11°C44°C39°C15.5°C10.5°CFILE NO. SVM-1303538UYV050M 38UYV060M 38UYV060M38UYV050M