Greenheck Fan ERV-522, ERV-581, ERV-582 Vibration, Energy Recovery Wheel, Drive Belt, Air Seals

Vibration

Excessive vibration may be experienced during initial start-up. Left unchecked, excessive vibration can cause a multitude of problems, including structural and/or component failure. The most common sources of vibration are listed.

Many of these conditions can be discovered by

	careful observation.
Wheel Unbalance	Refer to the
Drive Pulley Misalignment	Troubleshooting
Incorrect Belt Tension	section of this manual
Bearing Misalignment	for corrective actions.
Mechanical Looseness
	If observation cannot
Faulty Belts
	locate the source of
Drive Component Unbalance
	vibration, a qualified
Poor Inlet/Outlet Conditions
	technician using
Foundation Stiffness
	vibration analysis
equipment should be consulted. If the problem is
wheel unbalance, in-place balancing can be done.

Generally, fan vibration and noise is transmitted to other parts of the building by the ductwork. To eliminate this undesirable effect, the use of heavy canvas connectors is recommended.

Energy Recovery Wheel

The ERV models contain a total 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 Inside layout of ERV-361 the access door marked

“Energy Wheel Cassette

Access”. For the ERV- 251, 361, 521, and 522, the wheel cassette(s) slide out. Due to the size and weight of the ERV-

581 and 582 wheels, they

remain stationary and all

maintenance is performed Inside layout of ERV-522in place. There is room inside the unit to perform energy recovery wheel servicing.

Turn the energy

recovery		Bearing
	Adjustable	Support
wheels by
	Air Seals
hand to verify
free operation.
The wheel
should rotate	Drive Belt	Label
smoothly and		showing
		cassette
should not
		serial #
wobble.		and date
	Drive Pulley	code

Drive Belt

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

Air Seals

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 the unit for the ERV-581 and 582, or pull out the cassette for the ERV-251, 361, 521, and 522, following the instructions in the 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 the length of the cassette through the wheel center. Tighten the screws so the air seals tug slightly on the sheet of paper.

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) the wheel should rotate freely at about 50-60 RPM.

Model ERV Energy Recovery Unit 25