Cooling Tower Spray Pump Sequence

During this start up period flow rates can be so low as to cause bottom venting and prevent sometimes forever formation. As caused by tower pan vortex pan drain down or faulty bypass. Air in pump suction.

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A improper application of tower bypass controls.

Cooling tower spray pump sequence.

Unstable pump operational points as caused by. Evapco home page evapco. An unfortunate operational sequence can occur during pump start up when the pump energy head is devoted towards simply raising water from the low level pan to the highest part of the system. The vfd and the spray pump will remain on until the actual leaving temperature pressure falls below the leaving setpoint.

From there the fans can sequence or modulate to keep temp. From what i have seen the spray pump fires up first. For closed loop towers and evaporative coolers it showed stage 1 as the spray pumps for all units and the fans as successive stages. It s the smallest motor and most effective in cooling.

B high pressure drop tower spray nozzles in. Pump cavitation and loss of pumping ability as caused by inadequate pump suction pressure. The vfd cycles off when the temperature pressure falls below the lower deadband. Another reason for the pump running first is for water treatment.

There s prolly arguments both ways on which is best. 08 16 2018 11 56 pm 22. The vfd will cycle on to provide increased cooling. The spray pump cycles off when the temperature pressure falls below the.

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