Coway AP-1008CH User Manual page 15

To operate the silent mode
Press the power button and then the
silent button.
In silent mode, the airflow speed is
lowered below step 1 (lower rpm),
making the environment quiet and
pleasant.
To operate the sleep mode(available only in auto mode operation)
If the surroundings are dark for 3 minutes or longer in auto mode
operation, the product automatically switches to sleep mode,
lowering the airflow speed, noise, and electricity consumption. If the
surroundings become bright again for 5 minutes or longer, the unit
resumes normal operation.
In sleep mode, all displays except the power indicator are turned off.
How to use
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