Vibration; Energy Recovery Wheel; Drive Belt; Air Seals - Greenheck ERV Series Installation, Operation And Maintenance Manual

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.
• Wheel Unbalance
• Drive Pulley Misalignment
• Incorrect Belt Tension
• Bearing Misalignment
• Mechanical Looseness
• Faulty Belts
• Drive Component Unbalance
• Poor Inlet/Outlet Conditions
• 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 model contains 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-10, 20, 45, and 90, the wheel cassette(s) slide out.
Due to the size and weight of the ERV-120 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.

Drive Belt

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

Air Seals

Drive Belt
Drive Pulley
20 Energy Recovery Ventilator
Many of these
conditions can be
discovered by careful
observation. (Refer to
the Troubleshooting
section). If
observation cannot
locate the source of
vibration, a qualified
technician using
Bearing
Support
Label
showing
cassette
serial #
and date
code
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-120, or pull out the cassette
for the ERV-10, 20, 45, and 90, following the Energy
Recovery Wheel instructions on this page. 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.
Optional Start-Up Components
Dirty Filter Switch
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)
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, counter-clockwise 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.
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