Note
Caution
Operation
Wintertime Operation:
The Marley fill system used in the AV Series cooling tower has air entrance louvers that are molded integrally as part of the fill. This feature makes these towers very forgiving of cold weather operation, even at the low temperature and reduced load conditions encountered in free cooling and other low temperature applications. Nevertheless, during operation in subfreezing weather the opportunity exists for ice to form in the colder regions of the tower.
Slushy, transitory ice forms routinely in the colder regions of the fill of low temperature towers, and is visible through the tower louvers. Such ice normally has no adverse effect on tower operation, but its appearance should be a signal to the operator to undertake ice control procedures.
It is the operator's responsibility to prevent the formation of destruc- tive (hard) ice on the cooling tower fill. Certain guidelines should be followed:
1.Do not allow the tower’s leaving water temperature to drop below a minimum allowable
During the coldest days of the first winter of operation, observe whether any ice is forming on the louver face, particularly near the bottom part of the louver face. If hard ice is present on the louvers, you must increase the allowable cold water temperature. If the coldest possible water is beneficial to your process, ice of a mushy consistency can be
If the minimum allowable cold water temperature is established at or near minimum heat load, it should be safe for all operating condi- tions.
Having established the minimum allowable cold water temperature, main- taining that temperature can be accomplished by fan manipulation, as outlined in Item 4 under Tower Operation. However, in towers of more than one cell, where fans are manipulated sequentially, please realize that the water temperature will be significantly lower in the cell or cells operating at the highest fan speed than the net cold water temperature
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