Cooling Tower Spray Pump Sequence

Unstable pump operational points as caused by.

Cooling tower spray pump sequence.

Evapco home page evapco. As caused by tower pan vortex pan drain down or faulty bypass. Another reason for the pump running first is for water treatment. The vfd will cycle on to provide increased cooling.

08 16 2018 11 56 pm 22. The spray pump cycles off when the temperature pressure falls below the. The vfd cycles off when the temperature pressure falls below the lower deadband. The vfd and the spray pump will remain on until the actual leaving temperature pressure falls below the leaving setpoint.

It s the smallest motor and most effective in cooling. B high pressure drop tower spray nozzles in. From what i have seen the spray pump fires up first. A improper application of tower bypass controls.

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. During this start up period flow rates can be so low as to cause bottom venting and prevent sometimes forever formation. There s prolly arguments both ways on which is best. For closed loop towers and evaporative coolers it showed stage 1 as the spray pumps for all units and the fans as successive stages.