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3. Outdoor fan revolution number control
Control of fan revolution number and the fan taps in this unit are shown below.
Fan Taps Revolution number Allocation [rpm]
3-1. Cooling fan control
1) Cooling operations of the outdoor fan are controlled by a TL sensor, TO sensor and the compressor
revolution number. Control is performed per 1 tap of DC fan control.
The outdoor fan is controlled by every 1 tap of DC fan control (14 taps).
During startup, operation is fixed for 60 seconds to a maximum fan tap corresponding to the zones
shown in the table below. Thereafter fan tap is controlled by a temperature outputted from the TL sensor.
SM224
Upper Fan
Lower Fan
SM280
Upper Fan
Lower Fan
W1 W2 W3 W4 W5 W6 W7 W8 W9 WA WB WC WD WE WF
250 280 280 310 340 400 460 520 580 640 710 760 830 860 920
0 0 250 270 300 350 410 470 530 590 640 710 770 810 850
250 280 280 340 400 460 520 580 640 710 760 830 860 920 940
0 0 250 300 350 410 470 530 590 640 710 770 810 850 920
3-2 Heating fan control
1) Heating operations of the outdoor fan are controlled by a TE sensor, TO sensor and the compressor
revolution number.
(Control from a minimum W1 to a maximum is performed according to the table below).
2) Operation is fixed for 3 minutes after start up by a maximum fan tap corresponding to the zones in the
table below. Thereafter fan control is performed using the temperature from the TE sensor.
3) When TE ≥ 24°C continues for 5 minutes, the compressor is stopped. The compressor is placed in
the same state as a normal thermostat OFF without an error display.
The compressor is restarted after approximately 2 minutes 30 seconds and such interrupted operation
does not constitute an error. When the operation in 3) above is frequently performed, the filter of the
intake section of the indoor unit may require cleaning.
Therefore restart operation after cleaning the filter.
24
TE (˚C)
21
18
15
–2 taps / 20 sec.
Stop timer count
(Until W1)
+1 tap / 20 sec.
Revolution number HOLD
–1 tap / 20 sec.
(Until W1)
–2 taps / 20 sec.
(Until W1)
Maximum
10°C ≤ TO
5 ≤ TO < 10°C
–3 ≤ TO < 5°C
–10 ≤ TO < –3°C
TO < –10°C
TO error
Less than
45 rps
WA
WC
WF
WF
WF
WF
45 rps or more
and less than 60 rps
WB
WD
WF
WF
WF
WF
60 rps
or more
WC
WF
WF
WF
WF
WF
38°C ≤ TO
29°C ≤ TO < 38°C
15 ≤ TO < 29°C
5 ≤ TO < 15°C
0 ≤ TO < 5°C
–5 ≤ TO < 0°C
TO < –5°C
TO error
Less than 45 rps
Min. Max.
W6 WE
W5 WD
W3 WA
W2 W8
W1 W6
W1 W5
W1 W4
W1 WE
45 rps or more
and less than 60 rps
Min. Max.
W8 WF
W7 WF
W5 WC
W4 WA
W3 W8
W2 W7
W3 W5
W3 WF
60 rps or more
Min. Max.
WA WF
W9 WF
W7 WE
W6 WC
W4 WA
W3 W8
W3 W6
W3 WF
37
58
55
34
TL (˚C)
+1 tap / 20 sec.
Until Maximum rps
in each zone
–1 tap / 20 sec.
Until Minimum rps
in each zone
Revolution number HOLD
( )
( )
WF tap