Vibration - Greenheck APEX Series Installation, Operation And Maintenance Manual

Tighten all fasteners and set screws securely and realign
drive pulleys after adjustment. Check pulleys and belts
for proper alignment to avoid unnecessary belt wear,
noise, vibration and power loss. Motor and drive shafts
must be parallel and pulleys in line (see diagrams in Belt
Belt Span
Deflection =
Drive Installation section).
64
Belt Drive Installation
1. Remove the protective coating from the
end of the fan shaft and assure that it is
free of nicks and burrs.
Belt Span
2. Check fan and motor shafts for parallel
and angular alignment.
3. Slide sheaves on shafts. Do not drive
sheaves on as this may result in bearing
damage.
4. Align fan and motor sheaves with a
straightedge to centerline.
5. Place belts over sheaves. Do not pry
WRONG
or force belts, as this could result in
damage to the cords in the belts.
6. With the fan off, adjust the belt tension
by moving the motor base. When in
operation, the tight side of the belts
should be in a straight line from sheave
to sheave with a slight bow on the slack
WRONG
side.
WRONG
Proper alignment of motor and drive shaft .
Direction of Fan Wheel Rotation
Blower access is labeled on
unit. Check for proper wheel
rotation by momentarily
energizing the fan. Rotation
is determined by viewing the
wheel from the drive side and
should match the rotation
decal affixed to the fan
housing.
If the wheel is rotating the wrong
way, direction can be reversed
by interchanging any two of the
Airflow
three electrical leads. Check
for unusual noise, vibration, or
overheating of bearings. Refer
to the Troubleshooting section
Backward Inclined
of this manual if a problem
develops.
®
Backward Inclined
WRONG
CORRECT
WRONG
WRONG
Airflow
Backward Inclined
Forward Curved
(ERT)
Forward Curved
Fan RPM
Supply fan and exhaust fan will have an adjustable
motor pulley (on 15 HP and below) preset at the factory
to the customer-specified RPM. Fan speed can be
increased or decreased by adjusting the pitch diameter
of the motor pulley. Multi-groove variable pitch pulleys
must be adjusted an equal number of turns open
or closed. Any increase in fan speed represents a
0.25 in.
substantial increase in load on the motor. Always check
the motor amperage reading and compare it to the
1.5 in.
amperage rating shown on the motor nameplate when
changing fan RPM. All access doors must be installed
except the control center door.
Do not operate units with access doors open or
without proper ductwork in place as the fan motors
will overload.
Unit
2 in.
Pulley
alignment
APEX-200
example

Vibration

Excessive vibration may be experienced during initial
start-up and can cause a multitude of problems,
including structural and/or component failure.
Vibration Causes
Off axis or loose components
Drive component unbalance
CORRECT Poor inlet / outlet conditions
Foundation stiffness
If observation cannot locate the source of vibration, a
qualified technician using vibration analysis equipment
should be consulted. If the problem is wheel unbalance,
Airflow
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.
Backward Inclined
(ERT)
WARNING
Maximum RPM for
Blower
Forward Curved Blowers
Diameter
x Width
Class I
(inches)
Max RPM
18 X 18 1000
Many of these
conditions can be
discovered by careful
observation. Refer to
the Troubleshooting
section of this manual
for corrective actions.
Forward Curved
Model APEX Energy Recovery Ventilator
Class II
Max RPM
1450
17