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Marley
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MCW Cooling Tower
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Specifications: Options
28
■ If it is your opinion that the control system for the cooling tower
be part of the cooling tower manufacturer’s responsibility, we are
in wholehearted agreement with you. Who better to determine the
most efficient mode and manner of a cooling tower’s operation—
and to apply a system most compatible with it—than the designer
and manufacturer of the cooling tower?
Marley variable speed drives are also available for the ultimate in
temperature control, energy management, and mechanical equip-
ment longevity.
Control Options
Fan Motor Starter Control Panel:
6.4 Add the following paragraph in
the Mechanical Equipment sec-
tion: Each cell of the cooling tower
shall be equipped with a UL listed
control system in a IP14 or IP56 out-
door enclosure capable of controlling
single-speed or two-speed motors as
required, and designed specifically for
cooling tower applications. The panel
shall include a main fused disconnect
or main circuit breaker with an external
operating handle, lockable in the off
position for safety. Across-the-line mag-
netic starters or solid-state soft-start
starters as required shall be controlled
with a thermostatic or solid-state
temperature controller. Door mounted
selector switches shall be provided
to enable automatic or man-ual con-
trol and wired for 120VAC control. If
required, control circuit to be wired out
to terminal blocks for field con-nection
to a remote vibration switch, overload
trip alarms and remote temperature
control devices. The temperature
controller shall be adjustable for the
required cold-water temperature. If
a thermostatic controller is used it
shall be mounted on the side of the
tower with the temperature sensing
bulb installed in the cold water basin
using a suspen-sion mounting bracket.
If a solid-state temperature control-
ler is used the controller will be door
mounted on the con-trol panel. The
temperature controller will display two
temperatures, one for outgoing water
and the other for set point. Water tem-
perature input shall be obtained using
a three-wire RTD with dry well in the
outlet water piping and wired back to
the solid-state temperature controller
in the control panel.