5.4.3 Outdoor Fan Control
5.4.3.1 Cooling Mode
Under normal operating conditions, the system
chooses the running fan speed according to the
ambient temperature:
When low ambient cooling is in effect::
Outdoor fan speed control logic (low ambient
cooling)
When T4 <15 ℃ (59 ℉) and T3 < 30 ℃ (86 ℉),
the unit enters into low ambient cooling mode.
The outdoor fan chooses a speed according to T3.
When T3≥38 ℃ (100.4 ℉) or when T4≥15 ℃ (59
℉), the outdoor fan chooses a speed according
to T4 again.
5.4.3.2 Heating Mode
Under normal operating conditions, the system
chooses a running fan speed according to
ambient temperature: