Greenheck Fan 55, HRE-20, 90, 45 manual Drive Belt, Air Seals, unit start-up, Energy Recovery Wheel

Adjustable

Air Seals

Drive Belt

unit start-up

Energy Recovery Wheel

The HRE models contain a sensible energy recovery wheel.. The wheels are inspected for proper mechanical operation at the factory.. However, during shipping and handling, shifting can occur that may affect wheel operation.. The wheel is accessible through the access door marked “Energy Wheel Cassette Access”.. For the HRE-20 AND HRE-45 models, the wheel cassette slides out. Due to the size and weight of the HRE-55 AND HRE-90 wheels, they remain stationary and all maintenance is performed in place.. There is room inside the unit to perform energy recovery wheel servicing..

Turn the energy recovery wheels by hand to verify free operation..

The wheel should rotate smoothly and should not wobble..

Inside layout of HRE unit

Drive Belt

Inspect the drive belt.. Make sure the belt rides smoothly through the pulley and over the wheel rim..

Air Seals

Air seals are located around the perimeter of the wheel and across the face of the wheel (both sides of wheel).. Check that these seals are secure and in good condition..

Check that the air seals located around the outside of the wheel and across the center (both sides of wheel) are secure and in good condition.. Air seal clearance is determined by placing a sheet of paper, to act as a feeler gauge, against the wheel face.. To access seals, enter unit for HRE-55 & HRE-90, or pull out the cassette for HRE-20 & HRE- 45, following the instructions in Energy Recovery Wheel Maintenance section.. To adjust the air seals, loosen all eight seal retaining screws.. These screws

are located on the bearing support that spans theDrive Pulley length of the cassette through the wheel center..

Tighten the screws so the air seals tug slightly on the sheet of paper..

Bearing Support

Label showing

cassette serial #

and date code

Replace cassette into unit, plug in wheel drive, replace access door and apply power.. Observe by opening door slightly (remove filters if necessary to view wheel) that the wheel rotates freely at about 35 RPM..

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