SPX Cooling Technologies Marley Sigma Steel Specifications, Specification Value, Control Options

Marley / Sigma Steel CoolingTower / Specifications: Options

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	Specifications	Specification Value
	Control Options	the execution and implementation of the contract.
	Control System:
5.7: Add the following paragraph in		■ If it is your opinion that the control system for the cooling tower should
	the Mechanical Equipment section:
	Each cell of the cooling tower shall	be part of the tower manufacturer’s responsibility, we are in whole-
	be equipped with a UL listed control	hearted agreement with you. Who better to determine the most efficient
	system in a NEMA 3R or 4X outdoor	mode and manner of a tower’s operation—and to apply a system most
	enclosure capable of controlling	compatible with it—than the designer and manufacturer of the cooling
	single-speed or two-speed motors	tower?
	as required, and designed specifi-
	cally for cooling tower applications.
	The panel shall include a main fused
	disconnect with an external operating
	handle, lockable in the off position for
	safety. Across-the-line magnetic start-
	ers or solid state soft-start starters
	as required shall be controlled with a
	thermostatic or solid state tempera-
	ture controller. Door mounted selector
	switches shall be provided to enable
	automatic or manual control and wired
	for 120VAC control. Control circuit to
	be wired out to terminal blocks for
	field connection to a remote vibration
	switch and for access to extra 120VAC
	50VA control power, 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 tem-
	perature sensing bulb installed in the
	cold water basin using a suspension
	mounting bracket. If a solid state tem-
	perature controller is used the control-
	ler 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.