Water equalization is required anytime there are two or more separate basins that are combined on the same condenser water loop. There are two main types of equalization: flume box or external equalizer pipe. Only one of these options is required.
The default equalization method for multi-cell units is a flume box.
The decision on whether to use a flume box or equalizer is typically determined by the person designing the system. External equalization requires pipework to be run (by others) between equalizer connections and is typically installed with a valve in the piping to facilitate hydraulic isolation of cells.
In contrast, to isolate cells with a flume box, a flume plate needs to be installed inside the cooling tower, under the water line, each time isolation is required. If you have additional questions about your connections, please contact your local EVAPCO sales representative for assistance.