Si21-205 Outdoor Unit (25/35 class)Function and Control 932.7 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. (The signal fromthe indoor unit must be divided into the zones as the followings.Detail Conditions for Start ControllingJudge the controlling start with the indoor heat exchanger temperature after 2 sec fromoperation start.Control in Each Zone2.8 Heating Peak-cut ControlOutline Heat Pump OnlyDuring heating operation, the signals being sent from 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.Control in Each ZoneThe heat exchange intermediate temperature of indoor unit controls the following.Stop zoneUnchanged zoneDrooping zoneUp zoneReturn / Reset zoneHeat exchangerthermistor temperatureStop zoneDrooping zoneUnchanged zoneUp zoneReset zoneHeat exchangerthermistortemperature
