Deflection= Belt Span

Belt Span

64

Figure 6

10.The adjustable motor pulley is factory set for the RPM specified. Speed can be increased by closing or decreased by opening the adjustable motor sheave.

11.Two groove variable pitch pulleys must be adjusted an equal number of turns open or closed.

12.Any increase in speed represents a substantial increase in the horsepower required by a unit.

13.Motor amperage should always be checked to avoid serious damage to the motor when speed is varied.

IMPORTANT

Adjust (tighten) belt tension after the first 24-48 hours of operation.

Maintenance

Motor maintenance is generally limited to cleaning and lubrication (where applicable). Cleaning should be limited to exterior surfaces only. Removing dust buildup on motor housing ensures proper motor cooling.

Greasing of motors is only intended when fittings are provided. Many fractional hp motors are permanently lubricated and should not be lubricated further. Motors supplied with grease fittings should be greased in accordance with manufacturers’ recommendations. Where motor temperatures do not exceed 104ºF (40ºC), the grease should be replaced after 2000 hours of running time as a general rule. Wheels require very little attention when moving clean air. Occasionally, oil and dust may accumulate causing imbalance. When this occurs, the wheel and housing should be cleaned to ensure smooth and safe operation.

All fasteners should be checked for tightness each time maintenance checks are performed prior to restarting unit.

A proper maintenance program will help these units deliver years of dependable service.

WARNING

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

WARNING

Uneven cleaning of the wheel will produce an out of balance condition that will cause vibration in the fan.

WARNING

This unit should be made non-functional when cleaning the wheel or housing (fuses removed, disconnect locked off).

Belt/Bearing Maintenance

1.Belts tend to stretch after a period of time. They should be checked periodically for wear and tightness. When replacing belts, use the same type as supplied with the unit.

2.Matched belts should always be used on units with multi-groove pulleys.

3.For belt replacement, loosen the tensioning device far enough to allow removal of the belt by hand. Do not force belts on or off. This may cause cords to break, leading to premature belt failure.

4.Once installed, adjust belts as shown in “Pre- Starting Checks.”

5.Shaft bearings can be classified in two groups: relubricating and non-relubricating. All bearings are factory lubricated and require no further lubrication under normal use (between -20ºF and 180ºF (-29° to 82°C) in a relatively clean environment).

6.Units installed in hot, humid or dirty locations should be equipped with special bearings. These bearings will require frequent lubrication. Caution should be employed to prevent overpacking or contamination.

7.Grease fittings should be wiped clean. The unit should be in operation while lubricating. Extreme care should be used around moving parts.

8.Grease should be pumped in very slowly until a slight bead forms around the seal. A high-grade lithium base grease is recommended.

9.Direct drive units require little maintenance except for cleaning, wheel alignment, and oiling according to motor label instructions.

Series L: Models LB, LBP, LD, and LDP

®

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Greenheck Fan LBP, Series L Models LB, LD AND LDP manual Belt/Bearing Maintenance
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LBP, LD AND LDP, Series L Models LB specifications

Greenheck's Fan Series L Models—LB, LD, LDP, and LBP—are engineered to provide efficient and reliable ventilation solutions for commercial and industrial applications. These fan models stand out due to their high-performance capabilities, advanced technology, and customizable features that meet various system requirements.

One of the key characteristics of the L Model series is its construction quality. These fans are built using robust materials that ensure longevity and durability, making them suitable for harsh operating environments. Additionally, the aerodynamic design of the fan blades enhances airflow while minimizing noise, leading to a quieter operation, which is particularly beneficial in places like schools, hospitals, and office buildings.

The LB series is particularly designed for general ventilation applications and incorporates a broad range of features. It includes a wide selection of fan sizes and capacities, allowing businesses to select the ideal model that suits their specific airflow and pressure needs. The inline belt drive setup is adjustable, offering flexibility in performance tuning based on application requirements.

For those with more stringent noise requirements, the LD model is specifically engineered for low-noise operations. The LD series incorporates acoustic materials and optimized blade designs that significantly reduce operational noise levels, making it perfect for noise-sensitive environments, such as healthcare facilities.

On the other hand, the LDP model emphasizes high-performance static efficiency. This model is particularly effective for applications requiring high pressure. With direct drive motors, the LDP fans deliver reliable performance with reduced maintenance needs. The design minimizes failure areas, making it a dependable choice over traditional belt-driven fans.

Lastly, the LBP fans are designed for building pressure applications, making them ideal for spaces that require controlled environments or negative and positive pressure situations. The robust motor options provided in this series enhance operational capabilities across various conditions.

All models in the Greenheck L Series come equipped with advanced technologies, including variable frequency drive (VFD) compatibility. This feature enables users to adjust fan speed based on changes in airflow requirements, further improving energy efficiency and reducing operating costs.

Overall, the Greenheck Fan Series L Models—LB, LD, LDP, and LBP—represent a culmination of advanced engineering and user-centric design, delivering superior performance, energy efficiency, and durability tailored to a wide range of ventilation needs across various industries.
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