Engineering manual
43
3 Outdoor unit’s Fan control
3.1 Normal operation
The OFAN speed is controlled according to the following objectives:
Mode OFAN Goal Note
Cool Mode
Keep the condensation temperature to the
appropriate value
Avoid exceeding the pressure ratio
Avoid too noise
Heat Mode
Keep the evaporating temperature to the
appropriate value
Avoid exceeding pressure ratio.
Avoid exceeding 12 degrees evaporating
temperature.
The Outdoor fan speed is based on the outdoor temperature and the total IDU Load/ODUnorm.
For cooling mode:
Of an Speed( RPM)-cooling
0
200
400
600
800
1000
-20 -10 0 10 20 30 40 50
OAT( )
℃
Of an Speed( RPM)
load=10%
load=50%
load=100
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