Si04-115 General FunctionalityMain Function 351.14 Freeze Protection Function in CoolingOutline During Cooling/Dry operation, when the heat exchanger’s temperature falls down excessively,the capacity supply will be reduced (frequency step down) so as to prevent freeze of the heatexchanger and the creation of dew on a rotor caused by a excessive capacity supply to theindoor unit.Processing∗ DTO : Freeze protection temperature of heat exchanger" The restriction for frequency is not conducted in the return area by means of freezeprotection control." Frequency is increased approximately every 2 Hz/min. in the up-area." Frequency alteration in the steady area is not conducted." Frequency - down is carried out in the step down area approximately every 2 ~ 4 Hz/min.." Compressors stop in the stop area. After compressor stops, fan keeps operating in 800 rpm(LL tap), aiming at rising heat exchanger’s temperature.Setting a constant J typeDTO4 15°CDTO3 8°CDTO2 7°CDTO1 5°CDTO0 0°CReturnat the descend ofheat exchanger temp.at the rise of heat exchanger temp. Return from stop.DTO0DTO1DTO2DTO3DTO4Step down areaSteady areaStop areaUp-area(R1920)
