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4. With no heat load on the circulating water, icing cannot be controlled
effectively by air control during freezing weather. Towers must not
be operated with reduced water rate and/or no heat load during
freezing weather. If the circulating water system cannot be shut
down, water returning from the process should be made to bypass
the tower. If a bypass is used, all water must be bypassed without
modulation. If the water bypass is directly into the tower's cold water
basin, its design must be approved by SPX Cooling engineers.
Intermittent Wintertime Operation:
If periods of shutdown (nights, weekends, etc.) occur during freezing
weather, measures must be taken to prevent the water in the cold wa-
ter basin—and all exposed pipework—from freezing. Several methods
are used to combat this, including Marley automatic basin heater sys-
tems.
Unless some means of freeze prevention is incorporated into your
system,thetowerbasinandexposedpipeworkshouldbedrainedat
the beginning of each wintertime shutdown period.
If tower basin is drained, verify that all basin heaters have been shut
off either by automatic cutoff or disconnect switch.
It is recommended that you discuss your freeze prevention options with
your local Marley sales representative.
Operation
Caution
Warning