SPX Cooling Technologies Marley MD Specifications, Specification Value, Control Options

Marley / MD CoolingTower / Specifications: Options

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	Specifications	Specification Value
	Control Options
	Fan Motor Starter Control Panel:
6.4	Add the following paragraph in	■ If it is your opinion that the control system for the cooling tower
	the Mechanical Equipment sec-	be part of the cooling tower manufacturer’s responsibility, we are
	tion: Each cell of the cooling tower	in wholehearted agreement with you. Who better to determine the
	shall be equipped with a UL listed	most efficient mode and manner of a cooling tower’s operation—
	control system in a IP52 or IP56 out-	and to apply a system most compatible with it—than the designer
	door enclosure capable of controlling	and manufacturer of the cooling tower?
	single-speed or two-speed motors as	Marley variable speed drives are also available for the ultimate in
	required, and designed specifically for
	cooling tower applications. The panel	temperature control, energy management, and mechanical equip-
	shall include a main fused discon-	ment longevity.
	nect or main circuit breaker with an
	external operating handle, lockable in
	the off position for safety. Across-the-
	line magnetic 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
	manual control and wired to meet local
	control voltage. If required, control cir-
	cuit to be wired out to terminal blocks
	for field connection to a remote vibra-
	tion switch, overload trip alarms and
	remote temperature control devices.
	The temperature controller shall be
	adjustable for the required cold-water
	temperature. If a thermostatic control-
	ler 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 suspension mounting
	bracket. If a solid-state temperature
	controller is used the controller will be
	door mounted on the control panel.
	The temperature controller will display
	two temperatures, one for outgoing
	water and the other for set point.
	Water temperature input shall be
	obtained using a three-wire RTD with
	dry well in the outlet water piping and
	wired back to the solid-state tempera-
	ture controller in the control panel.