SPX Cooling Technologies 7013F081 - 7013J121 Specifications, Specification Value, Basin Heater

Marley / MC Fluid Cooler / Specifications: Options

Specifications Specification Value

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temperature at the coil and the other for set point. Process temperature input shall be obtained using a thermal sens- ing device on the process coil and wired back to the solid state temperature controller in the control panel. Staging of multiple motors and speeds will be accomplished with an integral PLC.

Vibration Limit Switch:

6.5Add the following paragraph in the Mechanical Equipment section: A single-pole,double-throw vibration limit switch in a IP55 housing shall be installed on the mechanical equipment support for wiring into the owner’s control panel. The purpose of this switch will be to interrupt power to the motor in the event of excessive vibra- tion. It shall be adjustable for sensitiv- ity, and shall require manual reset.

Basin Heater:

11.2Add the following paragraph in the Cold Water Basin section: Provide an electric immersion heater for each cell of the fluid cooler to prevent freez- ing of water in the collection basin during periods of shutdown. The rod type heater is installed in the side of the cold water basin. Each heater will include an integral thermostat, set point nominally 4°C but adjustable to suit local operating requirements.

Fan Motor Variable Speed Drive:

Marley All Weather ACH550 System

6.4Add the following paragraph in the Mechanical Equipment section when VFD is used with customers Building Management System: A complete UL listed Variable Speed Drive system in a IP10 indoor, IP52 indoor or IP14 outdoor enclosure shall be provided. The VFD shall use PWM technology with IGBT switching and integrated bypass design.

VFD out put switching shall not cause mechanical issues with gearbox teeth or drive shafts. The VFD shall catch a fan spinning in the reverse direction without tripping. The panel shall include a main disconnect with short circuit protection and external operating handle, lockable

■Unless specified otherwise, a Fire Fighting Enterprises switch will be provid- ed. A double-pole, double-throw model is also available. The requirement for manual reset assures that the fluid cooler will be visited to determine the cause of excess vibration.

■The Marley basin heater components described at left represent our recommendation for a reliable automatic system for the prevention of basin freezing.They are normally shipped separately for installation at the jobsite by the installing contractor. When purchased in conjunction with the enhanced Control System option, however, they are customar- ily factory-mounted and tested.

Submerged in basin water, in which zinc ions are present, copper immersion heaters must not be used. Insist upon stainless steel.

The ambient air temperature that you insert in the specifications should be the lowest 1% level of winter temperature prevalent at site.

■Marley VFD drive systems are designed to combine absolute tem- perature control with ideal energy management. The fluid cooler user selects a cold water temperature and the drive system will vary the fan speed to maintain that temperature. Precise temperature control is accomplished with far less stress to the mechanical equipment components. The improved energy management provides fast pay- back.

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