-
168
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3) When the compressor is ON and if the outdoor fan speed is 75 rpm or lower for 30 seconds or longer, the compressor
is stopped immediately. 3 minutes after the compressor is stopped, if the thermostat ON conditions are satisfi ed,
the compressor will be restarted.
4) If the condition in item 3) is detected 5 times within 60 minutes after the fi rst detection, an anomalous stop occurs
and an error message (E48) is displayed.
Cooling
Heating
Compressor speed (rps)
Outdoor unit fan speed
Compressor speed (rps)
Outdoor unit fan speed
less than 46
4th speed (520 rpm)
less than 62
4th speed (520 rpm)
46 to less than 66
5th speed (570 rpm)
62 to less than 82
5th speed (570 rpm)
66 to less than 80
6th speed (685 rpm)
82 to less than 104
6th speed (685 rpm)
80 or more
7th speed (740 rpm)
104 or more
7th speed (740 rpm)
FDCVA251
(ii) Outdoor unit fan speed control
1) Fan speed control during low ambient air temperature cooling
The outdoor unit’s fan is controlled in accordance with the outdoor heat exchanger temperature (detected by Tho-R)
and the ambient air temperature (detected by Tho-A).
A-Zone
B-Zone
22
25
Ambient air temperature (˚C)
Retain
- 1 Speed (Lower limit 1st speed)
29
43
Outdoor heat exchanger temperature (˚C)
+ 1 Speed (Upper limit 4th speed)
a) In case that the ambient temperature is below 22°C (B-zone), the outdoor fan speed is immediately raised to 4th
speed and retained for 20 seconds. And then by sampling the outdoor heat exchanger temperature at 20-second
intervals, the outdoor fan speed is decided at the appropriate speed between the lower limit (1st speed) and the
upper limit (4th speed).
b) Control is cancelled when it is that the outdoor temperature is in the A-Zone and the outdoor fan tap is running at
3rd speed or higher. However even if the outdoor fan is running at 2nd speed, when the ambient air temperature
is 25°C or higher (A-zone) and the outdoor heat exchanger temperature is 43°C or higher, this control is also
cancelled.
2) Outdoor unit fan speed control during heating
a) If the ambient air temperature (detected by Tho-A) is detected in the B-Zone for 5 minutes continuously, the
outdoor fan tap is increased by 2 steps and is stepped up repeatedly up to the upper limit (7th speed).
b) When outdoor temperatue exceeds 17°C, the outdoor unit fan runs at 2nd speed.
B-Zone
0
Ambient air temperature (˚C)
2
A-Zone
ON
OFF
3
5
Ambient air temperature (˚C)
(e) Snow protection fan control
If SW5-2 on the outdoor unit PCB is turned ON, a full stop results. In case that the ambient temperature is 3°C or lower during full
stop, anomalous stop and/or thermostat OFF, the outdoor fan is forced to run for 10 seconds at 6th speed once every 10 minutes.
