Greenheck ERCH - Energy Recovery Unit with Packaged DX (468151) - Manual (Page 28)

28
Energy Recovery Unit with Packaged DX
Fans
The ERCH 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.
Forward
Curved
Fan
Belt Span
Deflection =
Belt Span
64
WRONG WRONG
WRONG CORRECT
Belt Span
Deflection =
Belt Span
64
WRONG WRONG
WRONG CORRECT
Proper alignment of motor and drive shaft.
FAN
MOTOR
FAN
MOTOR
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 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) .