Delta Operation and Maintenance of Your TM Series Cooling Tower, Water Distribution System

Operation and Maintenance of Your TM Series Cooling Tower

Safety in Operation of the Fan

NEVER operate the fan when the access panel or the entire fan guard is removed.

NEVER remove access manhole cover while fan is in operation.

NEVER operate fan when any work, access, maintenance, trouble-shooting, etc. is being performed on the inside of the fan ring assembly or inside the tower plenum.

•Normally, electrical codes dictate a disconnect box at the cooling tower.

•The handle of the disconnect box must be locked in the off position and an OSHA DANGER tag (DO NOT OPERATE) must be attached to handle securely.

Note: Removing fuses from the disconnect box may provide further assurance, but only when done by qualified personnel.

The foregoing precautions apply when any type of internal access to the tower is required, including the following examples:

•Checking, maintenance or replacement of any fan assembly component.

•Checking, maintenance or replacement of the water distribution system inside the tower.

•Cleaning of the fill.

•Any work that necessitates removal of any access door, the fan guard or the manhole cover.

Water Distribution System

Water distribution is accomplished by a low pressure, non-rotating, spray nozzle system designed to accommodate the specified flow rate.

IMPORTANT:

•The flow rate of the cooling tower must be as close to the design gpm as possible. The water distribution system, including spray nozzles, is provided for the design flow condition. Under-pumping or over-pumping will cause the cooling tower to perform inefficiently.

•Design pressure at the inlet connection must be maintained for proper water distribution.

If the pressure is less or greater than the design, proper water dispersion over the internal wet decking will be impaired. If inlet pressure is low, water spray will not cover the entire wet decking surface. This causes channeling of air, and does not make maximum use of the heat transfer media. High inlet pressures will cause the water to over-spray the wet decking media, hit the internal side walls of the tower shell and drop in a vertical flow along the shell walls without the opportunity for water / air contact through the heat exchange media. Excessive high spray pressure may also cause wet decking fatigue and damage.

•The operating inlet pressure should be between 4.0 and 5.5 psi at the tower inlet.

Revised 1-8-2007 11