Cooling Tower Fan Staging

Central Plant Design

Year 3-470 XP

Order the steps for properly staging cooling tower fans to efficiently meet the condenser water temperature setpoint.

Drag to reorder, or use the arrow buttons.

1Increase lead tower fan to high speed if condenser water setpoint is not met

2Enable lead tower fan at low speed to begin heat rejection

3Stage lag tower fan to low speed before pushing lead fan harder

4Verify approach temperature — condenser water leaving temp vs. outdoor wet-bulb

5Increase lag tower fan to high speed if additional capacity is still needed

6Enable VFD speed trim on all running fans to optimize energy use at partial load