Description of basic control functions9 Operation Control9.1. Operation Mode1. Thermostat control2. Depend on differences between room temperature and setting temperature, Compressor running frequency will be decided andstart operation.Temperature differences become same as below table, then thermostat is off.Temperature DifferencesUnit: °CIndoor type Cassette Ceiling Duct D2 Duct D3Cool mode -1.5 -1.5 -2.0 -2.0Dry mode -2.5 -2.5 -3.0 -3.0Heat mode 3.5 2.5 2.5 2.53. Select indoor temperature thermostatWhen connected to wired remote controller, either indoor unit thermostat or remote controller thermostat is available, usingremote control setting.9.2. Compressor Start Control•••• When the compressor start, compressor frequency will be fixed at lower level for certain time, to follow the below table, due toavoid the compressor oil discharge.•••• Judging from compressor discharge temperature, decide the start condition to select either cool start control, or warm startcontrol.Discharge temp. [°C] >15°C 15°CStart control Cool start Warm startWarm start : set 1 → *set 5 → normal controlCool start : set 1 → set 2 → set 3 → set 4 → *set 5 → normal control•••• Note−−−− Frequency at *set 5 = frequency calculated by normal control−−−− In case of frequency at set n excess the frequency at set 5 in cool condition, skip from set n to set 4 and transfer to set 5.9.3. Cooling Operation9.3.1. Cool indoor fan control•••• Fan speed manualCommon control for unit using DC motor / unit using AC motor.Operation start at hi speed, or medium speed, or low speed set by remote control.•••• Fan speed autoWhen operation start, or shifting to thermostat ON condition from thermostat OFF condition, odour cut operation (refer odourcut operation page for detail), after thermostat ON condition, indoor fan operate as below control.22CS-F50DTE5 CU-L50DBE8