Service Manual

SiUS041638E Main Functions
Functions and Control 30
1.14 Other Functions
1.14.1 Hot-Start Function
In order to prevent the cold air blast that normally occurs when heating operation starts, the
temperature of the indoor heat exchanger is detected, and the airflow is either stopped or
significantly weakened resulting in comfortable heating.
Note: The cold air blast is prevented using similar control when defrost control starts or when the
thermostat is turned ON.
1.14.2 Signal Receiving Sign
When the indoor unit receives a signal from the remote controller, the unit emits a signal receiving
sound and the operation lamp blinks.
1.14.3 Indoor Unit ON/OFF Button
ON/OFF button is provided on the display of the unit.

Press ON/OFF button once to start operation. Press once again to stop it.

ON/OFF button is useful when the remote controller is missing or the battery has run out.
Forced cooling operation
Forced cooling operation can be started by pressing ON/OFF button for 5 to 9 seconds while the
unit is not operating. Forced cooling operation is not started if ON/OFF button is pressed for 10
seconds or more.
Refer to page 105 for details.
1.14.4 Auto-restart Function
If a power failure (even a momentary one) occurs during the operation, the system restarts
automatically in the same conditions as before when the power supply is restored to the conditions
prior to the power failure.
Note: It takes 3 minutes to restart the operation because the 3-minute standby function is activated.
Mode Temperature setting Airflow rate
Cooling Only COOL 22°C (72°F) Automatic
Heat Pump AUTO 25°C (77°F) Automatic
ON/OFF button
(R20396)