Cooling Tower Duty Motor
OVERVIEW Cooling tower duty motors in Marley products are built according to NEMA standards and designed to withstand exposure to hot, moist cooling tower conditions. The TEFC (totally-enclosed, fan-cooled) motor is protected from water and debris, reducing maintenance requirements. Additionally, to support long service life, the motor’s interior is fan-cooled and coated with epoxy for maximum protection from heat, moisture and corrosion. The exterior housing is high-grade cast iron.


The TEFC motor, with its internal fan, does not rely on cooling tower airflow for cooling. Even at slow fan speeds, the motor can continue to cool itself, which helps to extend its service life and increase its reliability. TEFC-type motors provide effective ventilation at all speeds.

Drain plugs are located on every 90-degree angle of the motor and on the face of each end shield to accommodate any mounting configuration.

For cooling tower applications up to 100-horsepower, motors include sealed bearings that require no greasing.

When combined with the VFD in a single-solution package, customers can realize up to 30 percent energy savings compared to a two-speed starter, and up to 70 percent compared to a single-speed starter.*

*Based on UPDATE selection for a three-cell NC8405TAN with 40hp motor per cell running 24/7 for 5 years. Total water flow over the tower is 4500 GPM. Cost is $0.10 per kWh with an assumed annual interest rate of 3%. Cold water set point is 75°F, with an average wet-bulb temperature of 50.7°F, (average seasonal value for Cincinnati, OH).


Genuine Marley OEM parts are precision-engineered to provide you with a reliable product. While other suppliers may offer parts at an initial savings, you risk lowering performance — and losing FM and CTI ratings. Marley OEM parts provide the durability you can trust because we design and manufacture them exclusively for cooling towers.

With plant operation relying on your cooling tower performance, it’s important to select the parts that are among the highest quality available — Marley OEM parts.

Featured Video:

  • TEFC (Totally enclosed, fan cooled)

  • Up to 150-hp package

  • 200-hp and higher includes single-speed motor

  • Minimal maintenance

  • 5-year warranty included


Marley Cooling Tower Parts