Cooling Tower Fan Controller :-

All are aware that cooling tower works on evaporation principle.  So one can best achieve wet bulb temperature in cooling tower .  In majority cases, this cooling fan remains ON due to many reasons, like no temperature control, setting much below the achievable temperature etc.  Cooling tower fan consumes heavy electrical power and electricity is becoming costlier every day. 

We have two models to control cooling tower fan.

Model One : Set point adjustment with respect to  wet bulb temperature. 

Model Two  : Set point independent of wet bulb i.e. adjustable from 20 to 50⁰C.

Model One : 

One can adjust set point from 2 to 3⁰C below wet bulb temperature to + 50⁰C.  Differential is adjustable from 1 to 9⁰C.  So cooling tower fan cuts off if chilled water temperature falls below set temperature.  It starts when water temperature rises above the set point + differential (Hysterises) setting.  In day time wet bulb temperature may rises.  The cut off temperature automatically get adjusted to this change in wet bulb temperature (As one can not achieve much below wet bulb temperature using cooling tower).  So, one can not set much below the wet bulb temperature. 

Precaution: one has to look after wet bulb sensor and water level.

Model Two :

For ease of operation, we have “ Model Two”.  There is no web bulb reference in this model and set point is adjustable from + 20 to + 50⁰C.  Rest is same as model one. 

In both the models controller controls master starter of fan and it is irrespective of fan HP rating.  So, one can manually also control fan using existing starter.

Fan off time is recorded on hour meter provided on the controller.  So one can easily monitor the electricity saving form month/year or any specific interval.