/ Freeze Prevention /

When the ambient air temperature falls below 0°C, the water in a cooling tower can freeze. Marley Technical Report #H-003“Operating Cooling Towers in Freezing Weather” describes how to prevent freezing during operation. Ask your Marley sales representative for a copy or download from our website.

Water collects in the cold water basin during shutdowns, and may freeze solid. You can prevent freezing by adding heat to the water left in the tower. Or, you can drain the tower and all exposed piping at shutdown.

Electric Basin Heaters

Provide an electric immersion heater for each cell of the tower to prevent freezing 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.

Any exposed piping that is still filled with water at

shutdown —including the makeup water line—should be electrically traced and insulated (by others).

Indoor Tank Method

In this type of system, water flows from an indoor tank, through the load system, and back to the tower, where it is cooled. The cooled water flows by gravity from the tower to the tank located in a heated space. At shutdown, all exposed water drains into the tank, where it is safe from freezing.

The table on page 9 lists typical drain-down capacities for all Aquatower models. Although we do not produce tanks, many of our representatives offer tanks supplied by reputable manufacturers.

The amount of water needed to successfully operate the system depends on the tower size, flow and the volume of water contained in the piping system to and from the tower. You must select a tank large enough to contain those combined volumes—plus a level sufficient to maintain

a flooded suction on your pump. Control makeup water according to the level where the tank stabilizes during operation.

You should always use a bottom outlet for this type of piping system. The following table lists the flow capacities for bottom outlets.

Basin Heater Selection

Tower

-12°C Ambient

-25°C Ambient

 

 

 

 

Model

Tank Heater

Component

Tank Heater

Component

 

Heater

Heater

 

 

 

 

 

 

 

 

490A

2 kW

3 kW

2 kW

3 kW

 

 

 

 

 

490B

2 kW

3 kW

2 kW

3 kW

 

 

 

 

 

492A

2 kW

3 kW

2 kW

3 kW

 

 

 

 

 

492B

2 kW

3 kW

2 kW

3 kW

 

 

 

 

 

493A

2 kW

3 kW

3 kW

3 kW

 

 

 

 

 

493B

2 kW

3 kW

3 kW

3 kW

 

 

 

 

 

494A

2 kW

3 kW

4 kW

3 kW

 

 

 

 

 

494B

2 kW

3 kW

4 kW

3 kW

 

 

 

 

 

494C

2 kW

3 kW

4 kW

3 kW

 

 

 

 

 

495A

3 kW

3 kW

6 kW

4.5 kW

 

 

 

 

 

495B

3 kW

3 kW

6 kW

4.5 kW

 

 

 

 

 

496A

3 kW

4.5 kW

6 kW

6 kW

 

 

 

 

 

496B

3 kW

4.5 kW

6 kW

6 kW

 

 

 

 

 

1.Required kw is the amount of heat needed to maintain +4.5°C basin water temperature at the indicated ambient air temperature.

2.Tank heaters shown are 220 volts, single-phase.

3.Component heaters shown are 400 volts, three-phase. Options or special heater selections may add several weeks to delivery.

4.Heaters do not operate continuously. Heaters cycle on and off automatically as basin water temperature dictates.

5.Contact your Marley sales representative for selections appropriate for other ambient conditions than those shown here.

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SPX Cooling Technologies Marley Aquatower manual Freeze Prevention, Electric Basin Heaters, Indoor Tank Method

Marley Aquatower specifications

SPX Cooling Technologies, a renowned leader in cooling tower solutions, has made significant strides in the industry with the introduction of the Marley Aquatower. The Marley Aquatower is engineered to provide efficient and reliable cooling for a variety of applications, including industrial processes and HVAC systems. This innovative cooling tower showcases state-of-the-art features and technologies that set it apart in the market.

One of the standout features of the Marley Aquatower is its unique modular design. This design allows for easy installation and scalability, enabling users to customize their cooling solutions according to their specific needs. Additionally, the modular setup aids in reducing the overall footprint of the cooling tower, making it an ideal choice for facilities with spatial constraints.

The Marley Aquatower utilizes advanced materials and construction techniques to enhance durability and performance. Built with high-quality corrosion-resistant materials, the unit is designed to withstand the harshest environmental conditions, ensuring long-term reliability and minimal maintenance requirements. This is particularly advantageous for operations that are looking to reduce downtime and maintenance costs.

In terms of technology, the Marley Aquatower incorporates several innovations aimed at improving energy efficiency. The unit features a highly efficient heat transfer design that optimizes thermal performance while minimizing water consumption. This ensures that the cooling process is not only effective but also environmentally friendly. The combination of efficient fans and a well-designed airflow system further enhances energy savings, making it a sustainable choice for modern cooling needs.

The Aquatower is equipped with advanced monitoring and control systems, allowing operators to track performance metrics and make necessary adjustments in real-time. This technology enhances operational efficiency and facilitates proactive maintenance strategies, reducing the risk of unexpected failures and enhancing overall system reliability.

Another characteristic that stands out is its quiet operation. By incorporating noise-reducing features, the Marley Aquatower can be installed in noise-sensitive areas without causing disruptions, making it suitable for urban environments and other locations where noise levels must be managed.

In conclusion, the SPX Cooling Technologies Marley Aquatower combines innovative design, advanced materials, and energy-efficient technologies to deliver a top-tier cooling solution. With its modular construction, durability, efficiency, and quiet operation, it has become a preferred choice for a wide range of industrial and HVAC applications, setting new standards in the cooling tower industry. The Marley Aquatower is an embodiment of SPX’s commitment to providing superior cooling solutions that meet the evolving needs of the marketplace.