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8
Routine Starting Procedure
After periods of routine shutdown, the following restarting procedure
should be followed:
• Start the circulating water pump(s). Increase the flow of circulating water
gradually to design water rate to avoid surges or water hammer which
could damage the distribution piping.
Circulating cold water over a tower in freezing weather will cause ice
to form, which may cause damage to the fill system. Water should be
bypassed directly to the cold water basin until the heat load causes
its temperature to rise above 70°F (21°C), at which time it may be
directed over the tower. Also, towers must not be operated with
reduced water rate and/or no heat load during freezing weather. If
a bypass is used, do not modulate.
• Start the fan(s). On multi-cell towers, only as many fans should be started
as are needed to produce the desired cold water temperature. If the
tower is equipped with two-speed motors, fans may be progressively
started at half speed, increasing to full speed as necessary to maintain
the desired cold water temperature. (See Temperature Control and
Energy Management on pages 13 and 14.)
▲ Caution