Greenheck Fan HEAT RECOVERY UNIT WITH EVAPORATIVE COOLING HRE-20 - Manual (Page 32)

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Fans (Forward Curved Type)
The HRE Models contain 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 .
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 .
SAFETY 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 .
UNIT START-UP
Refer to Parts List section for component locations.
Belt Span
Deflection =
Belt Span
64
WRONG WRONG
WRONG CORRECT
Belt Span
Deflection =
Belt Span
64
WRONG WRONG
WRONG CORRECT
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 straight-edge or string and
tighten .
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 .
FAN
MOTOR
FAN
MOTOR
Proper alignment of motor and drive shaft.
Fan Belt Drives
The fan belt drive components, when supplied by Greenheck, have been carefully selected for the unit’s
specific operating condition. Caution: utilizing different components than those supplied could result in unsafe
operating conditions which may cause personal injury or failure of the following components: 1) Fan Shaft, 2)
Fan Wheel, 3) Bearings, 4) Belt, 5) Motor . 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 below) .