Delta 21CK018C24 Instruction Manual page 20

3.4.13 Quiet Function Setting
Quiet function consists of two kinds: QUIET and AUTO QUIET.
Press Function button till the unit enters quiet function setting state, Quiet or Auto Quiet mark blinks. In this case,
press▲ or ▼ button to switch between Quiet and Auto Quiet and then press Enter/cancel button to turn on this
function.
In quiet mode, press Function button till the unit enters quiet function. In this case, Quiet or Auto Quiet icon blinks
and then press Enter/cancel button to cancel this function.
Quiet function setting is shown in Fig.3.4.13
Note:
1. During quiet function, fan speed is un-adjustable.
2. When turning on auto quiet function, the unit will enter quiet running state according to temperature difference
between room temperature and setting temperature. In this case, fan speed is adjustable. If temperature difference
between room temperature and setting temperature ≥ 4°C, fan will keep its current speed; if 2°C≤temperature
difference ≤3℃; fan speed will be reduced by one grade ,but if it is at minimun. grade, it is un-adjustable.; if
temperature difference ≤1°C, fan speed will be at minimun grade
3. In auto quiet mode, fan speed can not be raised but reduced. If high fan speed is manually adjusted, auto quiet
mode will quit.
4. There is not auto quiet function in fan or dry mode. Quiet off is default after power failure and then power
recovery.
5. If quite function is set, turbo function will be canceled.
Fig. 3.4.13 Quiet function setting
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