Panasonic CU-4E24RBU Service Manual

Also see for CU-3E19RBU: Operating instructions Service manual Service manual Service manual Installation manual

4211.2 Heating Operation11.2.1 Outdoor fan control When heating operation is enabled, based on outdoor ambient temperature, fan motor control will be adjustedaccording to figure below for Heating overload control:11.2.2 Heating Room Temp Sampling Control To improve the judgment accuracy, indoor room temperature sampling starts when any indoor unit has stoppedcapability supplied (heating thermo-off) during heating operation with compressor ON, outdoor unit will sendsignal to all thermo-off indoor units to ON fan motor and get room temperature sample. To prevent discharge temperature drop at indoor units which is ON when sampling the room temperature ofheating thermo-off units, the compressor frequency is increased accordingly. However, if indoor room temperature is much higher compare to remote control setting temperature, beforethermo-off, sampling of corresponding indoor unit will be cancelled.11.2.3 Powerful Operation 2 During cooling / heating operation, this control is to provide fast cooling / heating operation compare to normaloperation. Operation start if all condition below are complied:o Powerful operation ON for indoor unit.o Not under Annual Cooling control. Operation content:o Outdoor fan speed will adjust automatically.o Compressor frequency will adjust automatically. Operation stop when comply either one of the follow conditions:o When the powerful operation is OFF for all indoor units.o When annual cooling control activated.RPM controlled50.0°F (10°C)RPM free53.6°F (12°C)OD temp.