8
operation
Tower Start-Up
Microorganisms including Legionella bacteria can exist in premise
plumbing including cooling towers. The development of an effective
water management plan (WMP) and implementation of maintenance
procedures are essential to prevent the presence, dissemination and
amplification of Legionella bacteria and other waterborne contami-
nants throughout premise plumbing. Before operating the cooling
tower, the water management plan and maintenance procedures
must be in place and regularly practiced.
Water System:
1. Consult a knowledgeable water treatment professional to clean and
treat your new cooling tower prior to startup. Cooling towers must
be cleaned and disinfected regularly in accordance with local public
health services and recommendations.
2. Do NOT attempt any service unless the fan motor is locked out.
3. Remove any and all accumulated debris from tower. Pay particular at-
tention to inside areas of cold water basin, entire hot water basin, and
hot water inlet. Make sure that cold water suction screens are clear
and properly installed.
4. For NC8401 thru NC8405 fill the water system to an approximate
depth of 178mm in the depressed section of the cold water basin. For
NC8407 thru NC8414 fill the water system to an approximate depth
of 203mm in the depressed section of the cold water basin. This is
the recommended operating water level. Adjust the float valve so that
it is essentially closed at that level. Continue filling the system until the
water reaches a level approximately 4mm
below the lip of the overflow.
5. Start your pump(s). Observe system operation. Since the water system
external to the tower will have been filled only to the level achieved in
the cold water basin, a certain amount of “pump-down” of the basin
water level will occur before water completes the circuit and begins
to fall from the fill. The amount of initial pump-down may be insufficient
to cause the float valve to open. However, you can check its operation
by pressing down on the operating lever to which the stem of the float
valve is attached.
Warning
