Marley Aquatower 490A, Руководство пользователя

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12
Operation
Starting and Operating Instructions
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.
1. New installations should be cleaned and treated with biocides by a
water treatment expert before startup.
2. Clean all debris, such as leaves and dirt from the cooling tower fill and
basin.
. Fill the circulating system with water. The cold water basin should be
filled with water until level is at the rim of the overflow.
The water conditions during the initial tower operation are crucial in
preventing premature corrosion of galvanized steel (white rust). For
at least the first eight weeks of operation, pH should be controlled
between 6.5 and 8.0 with hardness and alkalinity levels between 100
and 00 ppm (expressed as CaCO
).
If tower is equipped with a standard side-suction connection, vent
any accumulated air from the top of the suction hood by removing
one or both tap screws provided at that location. Replace these tap
screws when venting is complete.
4. Start your pump(s). Observe system operation. Since the water system
external to the tower will have been filled only to the level in the cold water
basin, some “pump-down” of the basin water level will occur before wa-
ter completes the circuit and begins to fall from the fill. The initial pump-
down may not be enough to cause the float valve to open. However, you
can check its operation by pressing down on the operating lever. Adjust
the float valve during tower operation with heat load to maintain 4" water
depth in the depressed section of the basin on Models 490A through
49B. Maintain 5
1
⁄
2
" water depth on Models 494A through 496B.
Hot water temperatures exceeding 125°F could damage PVC fill.
Note
Note
➠
Warning