Function of CTXS, FTXS, CDXS, FDXS, FVXS Series SiUS121502E34 Function and Control1. Function of CTXS, FTXS, CDXS, FDXS, FVXS Series1.1 Temperature ControlDefinitions ofTemperaturesThe definitions of temperatures are classified as following. Room temperature: temperature of lower part of the room Set temperature: temperature set by remote controller Room thermistor temperature: temperature detected by room temperature thermistor Target temperature: temperature determined by microcomputer+ The illustration is for CTXS, FTXS series as representative.TemperatureControlThe temperature of the room is detected by the room temperature thermistor. However, there isdifference between the temperature detected by room temperature thermistor and the temperatureof lower part of the room, depending on the type of the indoor unit or installation condition.Practically, the temperature control is done by the target temperature appropriately adjusted for theindoor unit and the temperature detected by room temperature thermistor.1.2 Frequency PrincipleControlParametersThe frequency of the compressor is controlled by the following 2 parameters: The load condition of the operating indoor unit The difference between the room thermistor temperature and the target temperatureThe target frequency is adapted by additional parameters in the following cases: Frequency restrictions Initial settings Forced cooling operationTarget temperatureSet temperatureRoom temperatureRoom thermistor temperature(R12321)
