21
E46 Climate Control
CONTROL CURVES OPERATION
Blower Intervention
The graph below illustrates the solar influence on the blower fan with a constant Y factor
and the solar influence changing from 0 th 100%.
Blower power curves
The middle curve illustrates a blower curve without any solar influence. At a constant Y fac-
tor of 20%, the solar influence on the IHKA control module will cause the blower curve to
shift as the radiation increases from 0 to 100%.
With a solar influence of 0%, curve “B” is used, providing 25% power to the blower.
As the solar influence increases, the curve shifts upward until the solar influence reaches
100%. At this point, curve “A” is used providing 36% power to the blower.
During heating, the blower power decreases as solar influence increases.
While cooling, the blower power will increase as solar influence increases.
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