SiUS12-814 Main FunctionsFunction and Control 291.5 Automatic OperationAutomatic Cooling / Heating Function (Heat Pump Only)When the AUTO mode is selected with the remote controller, the microcomputer automaticallydetermines the operation mode from cooling and heating according to the room temperature andsetting temperature at the time of the operation startup, and automatically operates in that mode.The unit automatically switches the operation mode to cooling or heating to maintain the roomtemperature at the main unit setting temperature.DetailedExplanation ofthe Function1. Remote controller setting temperature is set as automatic cooling / heating setting temperature(64 to 96°F).2. Main unit setting temperature equals remote controller setting temperature plus correction value(correction value / cooling: Δ0 °F, heating: Δ3.6 °F).3. Operation ON / OFF point and mode switching point are as follows. Heating → Cooling switching point:Room temperature ≥ Main unit setting temperature +Δ4.5°F Cooling → Heating switching point:Room temperature < Main unit setting temperature –Δ4.5 °F Thermostat ON / OFF point is the same as the ON / OFF point of cooling or heatingoperation.4. During initial operationRoom temperature ≥ Remote controller setting temperature: Cooling operationRoom temperature < Remote controller setting temperature: Heating operationEx: When the set point is 77°FCooling Operation → 73.4°F: Thermostat OFF → 72°F: Switch to Heating OperationHeating Operation → 79.7°F: Thermostat OFF → 81.5°F: Switch to Cooling Operation(R6973)Setpoint + Δ4.5ºFSetpoint – Δ3.6ºF=Thermostat OFFSetpoint + Δ2.7ºF=Thermostat OFFHeating OperationSetpoint – Δ4.5ºFCooling Operation