Fuji Electric FRENIC-HVAC User Manual page 24

● Wet-bulb temperature presumption control
This function is optimal for controlling the fan of cooling tower. Since the wet-bulb temperature
would become higher than the set temperature when the air temperature is particularly high,
water temperature will not reach the set temperature. Therefore, the fan keeps rotating at high
speed, failing in energy-saving operation. FRENIC-HVAC automatically estimates
the wet-bulb temperature and controls the fan so that the cooling water is interlocked with the air
temperature in order not to use unnecessary electric power.
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