CAMCORP SWF with Externally Mounted Fan - Manual (Page 41)

HANDLING AND STORAGE
Fans should be lifted by the base, mounting supports, or lifting
eyes only. Never lift a fan by the wheel, shaft, motor, motor
bracket, housing inlet, outlet, or any fan part not designed for
lifting. A spreader should always be used to avoid damage.
On a direct drive Arrangement 8 fan, lifting holes are provided
in the motor base to assist in handling the fan assembly. These
lifting holes should be used in conjunction with the lifting eyes
when lifting and positioning the fan onto its foundation. A heavy
round steel bar or appropriate fixture can be passed through the
lifting holes to simplify attachment of the lifting device. Be sure
to follow all local safety codes when moving heavy equipment.
Whenever possible, fans and accessories should be stored in a
clean, dry location to prevent rust and corrosion of steel com-
ponents. If outdoor storage is necessary, protection should be
provided. Cover the inlet and outlet to prevent the accumulation
of dirt and moisture in the housing. Cover motors with water-
proof material. Refer to the bearing section for further storage
instructions.
Check shutters for free operation and lubricate moving parts
prior to storage. Inspect the stored unit periodically. Rotate the
wheel by hand every two weeks to redistribute grease on
internal bearing parts.
FAN INSTALLATION
nyb wheels are dynamically balanced when fabricated.
Complete assembled fans are test run at operating speeds to
check the entire assembly for conformance to nyb vibration lim-
its. Nevertheless, all units must be adequately supported for
smooth operation. Ductwork or stacks should be indepen-
dently supported as excess weight may distort the fan
housing and cause contact between moving parts. Where
vibration isolators are used, consult the nyb certified drawing
for proper location and adjustment.
Slab-Mounted Units
A correctly designed and level concrete foundation provides the
best means of installing floor-mounted fans. The mass of the
base must maintain the fan/driver alignment, absorb normal
vibration, and resist lateral loads. The overall dimensions of the
concrete base should extend at least six inches beyond the
base of the fan. The weight of the slab should be two to three
times the weight of the rotating assembly, including the motor.
The foundation requires firmly anchored fasteners such as the
anchor bolts shown in Figure 1.
Move the fan to the mounting location and lower it over the
anchor bolts, leveling the fan with shims around the bolts.
Fasten the fan securely. When grout is used, shim the fan at
least 3/4-inch from the concrete base. (See Figure 1.) When
isolation is used, check the nyb certified drawing for installation
instructions.
Elevated Units
When an elevated or suspended structural steel platform is
used, it must have sufficient bracing to support the unit load and
prevent side sway. The platform should be of welded construc-
tion to maintain permanent alignment of all members.
Figure 1
V-BELT DRIVE
Installation
1. Remove all foreign material from the fan and motor shafts.
Coat shafts with machine oil for easier mounting. Mount
the belt guard backplate at this time if partial installation is
required prior to sheave mounting.
2. Mount sheaves on shafts after checking sheave bores and
bushings for nicks or burrs. Avoid using force. If resistance
is encountered, lightly polish the shaft with emery cloth
until the sheave slides on freely. Tighten tapered bushing
bolts sequentially so that equal torque is applied to each.
3. Adjust the motor on its base to a position closest to the fan
shaft. Install belts by working each one over the sheave
grooves until all are in position. Never pry the belts into
place. On nyb packaged fans, sufficient motor adjustment
is provided for easy installation of the proper size belts.
4. Adjust sheaves and the motor shaft angle so that the
sheave faces are in the same plane. Check this by placing
a straightedge across the face of the sheaves. Any gap
between the edge and sheave faces indicates misalign-
ment. Important: This method is only valid when the width
of the surface between the belt edge and the sheave face
is the same for both sheaves. When they are not equal, or
when using adjustable-pitch sheaves, adjust so that all
belts have approximately equal tension. Both shafts should
be at the right angles to the center belt.
Belt Tensioning
1. Check belt tension with a tensioning gage and adjust using
the motor slide base. Excess tension shortens bearing life
while insufficient tension shortens belt life, can reduce fan
performance and may cause vibration. The lowest allow-
able tension is that which prevents slippage under full load.
Belts may slip during start-up, but slipping should stop as
soon as the fan reaches full speed. For more precise ten-
sioning methods, consult the drive manufacturer’s litera-
ture.
2. Recheck setscrews, rotate the drive by hand and check for
rubbing, then complete the installation of the belt guard.
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