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(16) Outdoor fan control at low outdoor temperature
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Cooling
(a) Operating conditions:
When the outdoor air temperature (TH2) is 22ºC or lower continues for 30 seconds while the
compressor command speed is other than 0 rps.
(b) Detail of operation:
After the outdoor fan operates at A speed for 60 seconds; the corresponding outdoor heat
exchanger temperature shall implement the following controls.
1) Outdoor heat exchanger temperature =< 21ºC
After the outdoor fan speed drops (down) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature is
lower than 21ºC
, gradually reduce the outdoor fan speed by 1 speed. (Lower limit 1st speed)
2) 21ºC < Outdoor heat exchanger temperature =< 38ºC
After the outdoor fan speed maintains at A speed for 20 seconds; if the outdoor heat exchanger temperature is 21ºC~
38ºC, maintain outdoor fan speed.
3) Outdoor heat exchanger tempeature > 38ºC
After the outdoor fan speed rises (up) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature is higher
than 38ºC, gradually increase outdoor fan speed by 1 speed. (Upper limit 3rd speed)
(c) Reset conditions:
When either of the following conditions is satisfied
1) The outdoor air temperature (TH2) is 25ºC or higher.
2) The compressor command speed is 0 rps.
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Heating
(a) Operating conditions:
When the outdoor air temperature (TH2) is 4ºC or lower continues for 30 seconds while the
compressor command speed is other than 0 rps.
(b) Detail of operation:
The outdoor fan is stepped up by 2 speed step at each 20 seconds. (Upper limit 8th speed)
(c) Reset conditions:
When either of the following conditions is satisfied
1) The outdoor air temperature (TH2) is 6ºC or higher.
2) The compressor command speed is 0 rps.
Outdoor temperature > 10˚C
Outdoor temperature <= 10˚C
2nd speed
Outdoor fan
1st speed
¡
Value of A