SPX Cooling Technologies CoolingTower Marley MCW - Manual (Page 11)

11
If the water supply system is not being operated—or if there is no
heat load on the system—motor amps read at this time may indicate
an apparent overload of as much as 10–20%. This is because of the
increased density of unheated air flowing through the fan. Determi-
nation of an accurate motor load should await the application of the
design heat load.
Tower Start-Up
Among other sources, outbreaks of Legionnaires’ Disease have
reportedly been traced to cooling towers. Maintenance and water
treatment procedures that prevent amplification and dissemination
of Legionella and other airborne bacteria should be formulated and
implemented BEFORE systems are operated and continued regularly
thereafter to avoid the risk of sickness or death.
Water System:
1. New installations should be cleaned and treated with biocides by a
water treatment expert before startup.
2. Remove any and all accumulated debris from tower. Pay particular
attention to inside areas of cold water basin, and drift eliminators.
Make sure that cold water suction screens are clear and properly
installed.
3. Fill the water system to an approximate depth of 13" in the cold water
basin. This is the recommended operating water level. Adjust the float
valve so that it is 75% open at that level. Continue filling the system
until the water reaches a level approximately
1 ⁄
8
" below the lip of the
overflow.
4. Completely open all hot water valves. Start your pump(s) and 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.
➠
Note
Installation
Warning