Greenheck Fan APEX-200 Routine Maintenance, Lubrication, Fan Belts, Safety Danger, Safety Caution

Routine Maintenance

SAFETY DANGER!

Electric shock hazard. Can cause injury or death.

Before attempting to perform any service or

maintenance, turn the electrical power to unit to OFF

at disconnect switch(es). Unit may have multiple

power supplies.

SAFETY CAUTION!

Use caution when removing access panels or other unit components, especially while standing on a ladder or other potentially unsteady base. Access panels and unit components can be heavy and serious injury may occur.

Once the unit has been put into operation, a routine maintenance program should be set up to preserve reliability and performance. Items to be included in this program are:

• Lubrication	• Bearings
• Dampers	• Filter Maintenance
• Fan Belts	• Coil Maintenance
• Motors	• Energy Wheel Cassette
• Wheel & Fasteners

Lubrication

Check all moving components for proper lubrication. Apply lubrication where required. Any components showing excessive wear should be replaced to maintain the integrity of the unit and ensure proper operation.

Dampers

Check all dampers to ensure they open and close properly and without binding. Backdraft dampers can be checked by hand to determine if blades open and close freely. Apply power to motorized dampers to ensure the actuator opens and closes the damper as designed.

Fan Belts

Belts must be checked on a regular basis for wear, tension, alignment, and dirt accumulation. Premature or frequent belt failures can be caused by improper belt tension (either too loose or too tight) or misaligned sheaves. Abnormally high belt tension or drive misalignment will cause excessive bearing loads and may result in failure of the fan and/or motor bearings. Conversely, loose belts will cause squealing on start-up, excessive belt flutter, slippage, and overheated sheaves. Both loose and tight belts can cause fan vibration.

When replacing belts on multiple groove drives, all belts should be changed to provide uniform drive loading. Do not pry belts on or off the sheave. Loosen belt tension until belts can be removed by simply lifting the belts off the sheaves. After replacing belts, ensure that slack in each belt is on the same side of the drive. Belt dressing should never be used.

Do not install new belts on worn sheaves. If the sheaves have grooves worn in them, they must be replaced before new belts are installed.

Deflection = Belt Span 64

Belt Span

The proper belt setting is the lowest tension at which the belts will not slip under peak load operation (see FIGURE 22). For initial tensioning, set the belt deflection at 1⁄64-inch for each inch of belt span (measured half-way between sheave centers). For example, if the belt span is 64 inches, the belt deflection should be 1 inch (using moderate thumb pressure at mid-point of the drive). Check belt tension two times during the first 24 hours of operation and periodically thereafter.

FIGURE 22: Proper fan belt settings

18®