Control Specification (09/12 Class) SiUS04-90442 Function and Control3.7 Heating Peak-cut ControlOutline During heating operation, the signals being sent from the indoor unit allow the operating frequencylimitation and prevent abnormal high pressure. The signal from the indoor unit must be divided asfollows:Detail Conditions for Start ControllingJudge the controlling start with the indoor heat exchanger temperature after 2 seconds fromoperation start.Control in Each ZoneThe heat exchanger’s intermediate indoor unit temperature controls the following:3.8 Fan ControlOutline Fan control is carried out according to the following conditions.1. Fan control when defrosting2. Fan OFF delay when stopped3. ON/OFF control when cooling operation4. Tap control when dropping function is working5. Fan control when forced operation6. Fan control in low noise mode7. Fan control during heating operation8. Fan control in the quiet mode9. Fan control in the POWERFUL mode10. Fan control for pressure difference upkeepDetail Fan OFF Control when Stopped Fan OFF delay for 60 seconds must be made when the compressor is stopped.3.9 Liquid Compression Protection Function 2Outline In order to ensure the dependability of the compressor, the compressor must be stopped accordingto the conditions of the temperature of the outdoor air and outdoor heat exchanger.Detail Operation stops depending on the outdoor air temperatureCompressor operation turns OFF under the conditions that the system is in cooling operation andoutdoor air temperature is below 10.4°F(–12°C).Operation can be extended to 0°F (17-18°C) (RXS-DAVJU only) with the addition of a windbaffle (KPW937A4).Dropping zone
