Routine Maintenance, Belts, Lubrication

number of turns open. Any increase in fan speed represents a substantial increase in horsepower required from the motor. Always check motor load amperage and compare to nameplate rating when changing fan speed.

Routine Maintenance

Once the fan has been put into operation, a periodic maintenance program should be set up to preserve the reliability and performance of the fan. Items to be included in this program are: Belts, Bearings, Fasteners and Setscrews, Lubrication, and Removal of Dust and Dirt.

WARNING

Always disconnect, lock and tag power source before installing or servicing. Failure to disconnect power source can result in fire, shock or serious injury.

Belts

Premature belt failures are frequently caused by improper belt tension (either too tight or too loose) or misaligned pulleys. The proper tension for operating a V-belt is the lowest tension at which the belts will not slip at peak load conditions. For initial tensioning, the proper belt deflection halfway between pulley centers is 1/64 inch (0.4 mm) for each inch of belt span. For example, if the belt span is 64 inches

(1626 mm), the belt deflection should be one inch

(25 mm) using moderate thumb pressure at midpoint of the drive. See figure shown below.

Slack

Side

Check belt tension two times during the first 24 hours of operation and periodically thereafter. To adjust belt tension, simply loosen four fasteners (two on each side of the motor plate) and slide the motor plate away from the fan shaft until proper belt tension is attained. On some fans, fasteners attaching the motor to the motor plate must be loosened in order to adjust the belt.

It is very important

that the drive pulleys remain in proper alignment after

adjustments are made. Misalignment of pulleys will result in premature belt

wear noise, vibration

and power loss.

Bearings (For belt drive fans only)

Bearings are the most critical moving part of the fan and should be inspected at periodic intervals. Locking collars and setscrews, in addition to fasteners attaching the bearings to the bearing plate, must be checked for tightness. In a clean environment and temperatures above 32ºF (0ºC) and below 200ºF (93ºC), fan shaft bearings with grease fittings should be lubricated semi-annually using a high-quality lithium based grease. If unusual environmental conditions exist, temperatures below 32ºF (0ºC) and above 200ºF (93ºC), moisture or contaminants, more frequent lubrication is required.

With the unit running, add grease very slowly with a manual grease gun until a slight bead of grease forms at the seal. Be careful not to unseat the seal by over lubricating or using excessive pressure.

Bearings without grease fittings are lubricated for life.

Fasteners and Setscrews

Any fan vibration has a tendency to loosen mechanical fasteners. A periodic inspection should include checking all fasteners and setscrews for tightness. Particular attention should be paid to setscrews or taper-lock bushings attaching the propeller to the motor shaft and the motor shaft to the bearings. Loose bearing setscrews will lead to premature failure of the fan shaft. In addition, check all fasteners attaching the motor to the motor plate.

Lubrication

Refer to the paragraph on bearings for bearing lubrication. Many fractional horsepower motors installed on the smaller fans are lubricated for life and require no further attention. Motors equipped with oil holes should be oiled in accordance with the manufacturer’s instructions printed on the motor. Use a high grade SAE 20 machine oil and use caution not to over lubricate. Motors supplied with grease fittings should be greased according to directions printed on the motor.

Removal of Dust and Dirt

Dirt clogs cooling openings on the motor housing, contaminates bearing lubricant and collects on propeller blades causing severe imbalance if left unchecked. The exterior surface of the motor, fan panel and entire propeller should be thoroughly cleaned periodically. Use caution and do not allow water or solvents to enter the motor or bearings. Motors or bearings must not be sprayed with steam or water.

The filters also require periodic cleaning. The 2 inch (51 mm) washable aluminum filters are accessed through the bolted access panel.

Sidewall Propeller Fans • Exhaust, Supply and Filtered Supply

PN 471755 specifications

The Greenheck Fan PN 471755 is a high-performance ventilation solution widely recognized for its reliability and efficiency in various commercial and industrial applications. As a leader in air movement and control, Greenheck has set the standard for innovative designs and cutting-edge technologies in the HVAC industry.

The PN 471755 is designed to provide exceptional airflow while maintaining optimal energy efficiency. One of its key features is its advanced motor technology, which incorporates energy-efficient motors that reduce energy consumption and operational costs. This is particularly beneficial for facilities looking to minimize their carbon footprint and comply with increasing energy regulations.

This fan model is built with high-quality materials, ensuring durability and long service life. It utilizes a robust construction that makes it suitable for both indoor and outdoor environments. The corrosion-resistant components enhance its performance in harsh conditions, making it an ideal choice for a variety of applications, from manufacturing plants to commercial kitchens.

Another significant characteristic of the PN 471755 is its quiet operation. Greenheck has implemented sound-dampening technologies that minimize noise levels while ensuring effective airflow. This is crucial for settings where noise control is a priority, such as schools, offices, and healthcare facilities.

The fan also features an easy installation process, with customizable designs that allow for flexibility in various configurations. Users can choose different sizes and mounting options to meet specific needs, ensuring that the PN 471755 integrates seamlessly into existing systems.

Additionally, the PN 471755 is equipped with advanced controls that enable users to monitor and adjust performance in real-time. This technology helps optimize airflow depending on specific demands, providing better indoor air quality and enhancing overall system efficiency.

In conclusion, the Greenheck Fan PN 471755 stands out in the HVAC market due to its innovative technology, energy efficiency, and quiet operation. Its robust design and customizable options make it a versatile choice for meeting diverse ventilation requirements in numerous applications. Whether you are looking to improve air quality or reduce energy costs, the PN 471755 is a reliable and effective solution.