Start-Up Components Fans; Fan Performance Modifications; Fan Belt Drives And Belt Installation; Direction Of Fan Wheel Rotation - Greenheck ERVe Series Installation, Operation And Maintenance Manual

Start-Up Components
Fans
The ERVe models contain two
forward curved (supply and
exhaust) fans. 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 this section.
CAUTION
When operating conditions of the fan are to be
changed (speed, pressure, temperature, etc.), consult
Greenheck to determine if the unit can operate safely
at the new conditions.
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. 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
Greenheck, 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
• 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
this section).
Fan Belt 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 straight-edge or string
and tighten.
®
5. Place belts over sheaves. Do not pry or force belts,
6. With the fan off, adjust the belt tension by moving
Forward Curved
Exhaust Fan

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 (see Rotation Direction figures). 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.
• Motor

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
substantial increase in load on the motor. Always check
the motor amperage reading and compare it to the
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.
as this could result in damage to the cords in
the belts.
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
Airflow
Energy Recovery Ventilator
WRONG CORRECT
Forward Curved
15