Control Specification (09/12 Class) SiUS04-90448 Function and ControlDetail I Judgment by power consumptionWhen an output frequency is exceeds 55 Hz and the input current is less than specified value, theadjustment is made for refrigerant shortage.II Judgment by discharge pipe temperatureWhen discharge pipe temperature is 36°F (20°C) higher than target value and the electronicexpansion value opening is 450 pulses (max.), the adjustment is made for refrigerant shortage.III Judgment by the difference of temperatureWhen the difference of the temperature is smaller than , it is regarded as refrigerant shortage.3.13 Forced Operation ModeOutline Forced operating mode includes only forced cooling.Detail Forced Cooling3.14 Additional Functions3.14.1 Powerful Operation ModeCompressor operating frequency is increased to PI Maximum. (Maximum. Hz of operating room)and outdoor unit airflow rate is increased.3.14.2 Voltage Detection FunctionPower supply voltage is detected each time equipment operation starts.Cooling room temperature – indoor heat exchanger temperature 7.2°F (4°C)outdoor heat exchanger temperature – outdoor temperature 7.2°F (4°C)Heating indoor heat exchanger temperature – room temperature 7.2°F (4°C)outdoor temperature – outdoor heat exchanger temperature 7.2°F (4°C)Item Forced CoolingForced operationallowing conditions1) The outdoor unit is not abnormaland not in the 3-minute standby mode.2) The operating mode of the outdoorunit is the stop mode.3) The forced operation is ON.The forced operation is allowed whenthe above “and” conditions are met.Starting/adjustment If the forced operation switch ispressed when the above conditionsare met.1) Commandfrequency 68 Hz2) Electronicexpansion valveopeningIt depends on the capacity of theindoor unit.3) Outdoor unitadjustment Compressor is in operation4) Indoor unitadjustmentThe command of forced operation istransmitted to the indoor unit.End 1) When the forced operation switch ispressed again.2) The operation is to endautomatically after 15 min.Others The protect functions are prior to allothers in the forced operation.
