SPX Cooling Technologies FSIG-TS-08A specifications Specifications, Specification Value

Marley / Sigma F Series CoolingTower / Specifications: Options 24

Specifications

Control Options

Control System:

5.7Add the following paragraphs in the Mechanical Equipment sec- tion: Each cell of the cooling tower shall be equipped with a UL listed control system in a NEMA 3R or 4X outdoor enclosure capable of control- ling single-speed or two-speed motors as required, and designed specifically for cooling tower applications. The panel shall include a main fused dis- connect 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.

Specification Value

■If it is your opinion that the control system for the cooling tower should be part of the tower manufacturer’s responsibility, we are in wholehearted agreement with you. Who better to determine the most efficient mode and manner of a tower’s operation—and to apply a system most compatible with it—than the designer and manufacturer of the cooling tower?