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2-4 Outdoor Fan Speed Control<br />
II - 6<br />
2. Processes and functions<br />
To optimize performance in air conditioner, the outdoor fan speed is selected automatically<br />
according to the outdoor temperature.<br />
❑ Note that in both Cooling and Heating modes, the fan comes on at first at<br />
high speed (H mode) for 5 seconds. Since outdoor conditions sometimes<br />
make it difficult for the fan to start, this sudden surge of power may be<br />
necessary.<br />
❑ The outdoor fan operates in H mode for 3 minutes after the compressor stops<br />
(excluding defrosting operation period).<br />
❑ Charts below show how the outdoor fan speed changes with the change in<br />
outdoor temperature.<br />
(A) Cooling<br />
Outdoor fan<br />
motor (FMo)<br />
25°C or more H<br />
less than 25°C M<br />
less than 19°C L<br />
* This is supposed to be coil temp [C2] when<br />
operating outdoor fan without running comp.<br />
(B) Heating<br />
*Outdoor Air<br />
temperature<br />
Outdoor coil Outdoor fan<br />
temperature [C2] motor (FMo)<br />
14°C or more M<br />
less than 14°C H<br />
OUTDOOR AIR TEMPERATURE (°C)<br />
OUTDOOR COIL TEMPERATURE (°C)<br />
25<br />
19<br />
14<br />
H<br />
M<br />
L<br />
M<br />
H<br />
Fig. 6<br />
Fig. 7
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