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Model ERV Energy Recovery Unit
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.
Refer to the
Troubleshooting
section of this manual
for corrective actions.
If observation cannot
locate the source of
vibration, a qualified
technician using
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.
Wheel Unbalance
Drive Pulley Misalignment
Incorrect Belt Tension
Bearing Misalignment
Mechanical Looseness
Faulty Belts
Drive Component Unbalance
Poor Inlet/Outlet Conditions
Foundation Stiffness
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.
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
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
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 ERV-361
Inside layout of ERV-522
Drive Belt
Adjustable
Air Seals
Label
showing
cassette
serial #
and date
code
Bearing
Support
Drive Pulley