Greenheck PVe (472846) - Manual (Page 15)

15 Model PVe Heat Recovery Unit
Start-Up Components
Fans
The unit contains a forward-
curved supply fan and a
forward curved exhaust
fan. These forward-curved
fans should be checked for
free rotation. If any binding
occurs, check for concealed
damage and foreign objects
in the fan housing. Be sure to
check the belt drives per the
start-up recommendations in
the following section.
Centering of the fan wheel can be accomplished by
loosening the wheel hub set screw and moving the
wheel to the desired position.
Fan Performance Modifications
Due to job specification revisions, it may be necessary
to adjust or change the sheave or pulley to obtain the
desired airflow at the time of installation. The start-up
technician must check blower amperage to ensure that
the amperage listed on the motor nameplate is not
exceeded. Amperage to be tested with access doors
closed and ductwork installed.
Fan Belt Drives
The fan belt drive components, when supplied by
manufacturer, have been carefully selected for the
unit’s specific operating condition. Utilizing different
components than those supplied could result in unsafe
operating conditions which may cause personal injury
or failure of the following components:
• Fan Shaft • Bearings • Motor
• Fan Wheel • Belt
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 Drive Installation section).
CAUTION
When operating conditions of the fan are to be
changed (speed, pressure, temperature, etc.), consult
manufacturer to determine if the unit can operate
safely at the new conditions.
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.
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
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. (See belt
tensioning procedures in the Routine
Maintenance section of this manual).
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 side.
WRONG WRONG WRONG CORRECT
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
three electrical leads.
Check
for unusual noise, vibration, or
overheating of bearings. Refer to
the Troubleshooting section of this
manual if a problem develops.
2 in.
1.5 in.
0.25 in.
centerline
straightedge
Pulley
alignment
example
R
o
ta
ti
o
n
Airflow
Rotation
Forward Curved
Forward Curved
Exhaust Fan