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,
follow 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 20-40 RPM.
Energy Recovery Wheel
The ERVe 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”.
Turn the energy
recovery wheels
by hand to verify
free operation. The
wheel should rotate
smoothly and should
not wobble.
Inside layout of ERVe
Drive Belt
Adjustable
Air Seals
Label showing
cassette serial #
and date code
Bearing
Support
Drive Pulley
Optional Start-Up Components
Dirty Filter Switch
To adjust the switch, the unit must be running with
all of the access doors in place, except for the
compartment where the switch is located (exhaust
intake compartment). The adjusting screw is located on
the top of the switch.
1. Open the filter compartment and place a sheet of
plastic or cardboard over 50% of the filter media.
2. Replace the filter compartment door.
3. Check to see if there is power at the alert signal
leads (refer to electrical diagram).
4. Whether there is power or not, turn the adjustment
screw on the dirty filter gauge (clockwise if you did
not have power, counterclockwise if you did have
power) until the power comes on or just before the
power goes off.
5. Open the filter compartment and remove the
obstructing material.
6. Replace the door and check to make sure that you
do
not
have power at the alert signal leads.
The unit is now ready for operation.
Setscrew (on front of switch) must
be manually adjusted after the
system is in operation.
Negative pressure connection
is toward the ‘front or top’ of
the switch.
(Senses pressure on the
blower side of filters)
Positive pressure connection is toward the ‘back or bottom’
of the switch.
(Senses pressure at air inlet side of filters)
Energy Recovery Ventilator
16
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