Control for Heat Pump Models Si01-40642 Functions and Control3.3 Controls at Mode Changing / Start-up3.3.1 Preheating OperationOutline Operate the inverter in the open phase with the conditions including the preheating command(only for heat pump model) from the indoor, the outdoor air temperature .Detail Preheating ON Condition When outdoor air temperature is below 11.5°C, inverter in open phase operation starts.OFF Condition When outdoor air temperature is higher than 13.5°C, inverter in open phase operation stops.3.3.2 Four Way Valve SwitchingOutline Heat Pump OnlyDuring the heating operation current must not be conducted and during cooling and defrostingcurrent must be conducted. In order to eliminate the switching sound (as the four way valve coilswitches from ON to OFF) when the cooling is stopped, the delay switch of the four way valvemust be carried out after the operation stopped.Detail The OFF delay of four way valveEnergize the coil for 160 sec after unit operation is stopped.3.3.3 Four Way Valve Activating GuaranteeOutline Heat Pump OnlyAt the beginning of the operation as the four way valve is switched, acquire the differentialpressure required for activating the four way valve by having output the operating frequency,which is more than a certain fixed frequency, for a certain fixed time.Detail Starting Conditions1. When starting compressor for cooling.2. When the operating mode changes from the previous time.3. When starting compressor for defrosting or resetting.4. When starting compressor for the first time after the reset with the power is ON.Set the lower limit frequency to 66 (model by model) Hz for 45 seconds with any conditions 1through 4 above.3.3.4 3-Minutes StandbyProhibit to turn ON the compressor for 3 minutes after turning it off.(Except when defrosting. (Only for Heat Pump Model).)3.3.5 Compressor Protection FunctionWhen turning the compressor from OFF to ON, the upper limit of frequency must be set asfollows. (The function must not be used when defrosting (only for heat pump model).)FCG 3FCG 2FCG 1TCG 1TCG 2TCG 3906646120570120
