SiBE12-817 Control SpecificationFunction and Control 753.6 Freeze-up Protection ControlOutline During cooling operation, the signals being sent from the indoor unit allow the operatingfrequency limitation and then prevent freezing of the indoor heat exchanger.Detail Conditions for Start ControllingJudge the controlling start with the indoor heat exchanger temperature after 2 sec fromoperation start and after 30 sec from changing number of operation room.Control in Each ZoneThe zone is determined by the commands from indoor units.In drooping zone, the frequency decreases 2Hz/2 seconds.3.7 Heating Peak-cut ControlOutline Heat Pump OnlyDuring heating operation, the signals being sent form the indoor unit allow the operatingfrequency limitation and prevent abnormal high pressure. (The signal from the indoor unit mustbe divided as follows.)Detail Conditions for Start ControllingJudge the controlling start with the indoor heat exchanger temperature after 2 min fromoperation start and after A sec from changing number of operation room.Control in Each ZoneThe maximum value of heat exchange intermediate temperature of each indoor unit controls thefollowing (excluding stopped rooms).In drooping zone, the frequency decreases 6Hz/40 seconds.In up zone, the frequency increases 2Hz/60 seconds.(R4561)Return from stopReset zoneHeat exchangerthermistor temperatureUp zoneKeep zoneDrooping zoneStop zone0˚C3˚C5˚C7˚C13˚CA302When increaseWhen decrease(R6034)Reset zoneHeat exchangerthermistortemperatureUp zoneKeep zoneDrooping zoneStop zone50˚C52˚C54˚C55˚C65˚C
