Cool Air NBCXM54L Manual

NBCXM54
GALVANIZED WALL FANS
Installation, Operation, and Maintenance Instructions
FARM PRODUCTS DIVISION
MEMBER OF AMCA
AMERICAN COOLAIR CORPORATION
P.O. BOX 2300
JACKSONVILLE, FLORIDA 32203
PHONE (904) 389-3646 FAX (904) 387-3449
E-MAIL - [email protected]
NBCXM54L * NBCXM54M
UNPACKING
Inspect the fan for signs of shipping damage. It is the responsibility of the customer to report any
shipping damage to the freight carrier.
WHAT SHOULD YOU FIND?
Fan, Damper Door Ring Assembly, Cone (4 cone panels and 4 cone gussets), Rear Guard, Front Cone Guard, and
Hardware Package
Figure 1
42 1/4 59 13/16
Guard 69 1/8
Dimensions
in inches
Wall of
Building
59 13/16

FRAMING
Page 2
POST CONSTRUCTION
Figure 3
4” x 4”
Post
Wall Opening:
56 1/2” Min.
58” Max.
Sq. I.D.
FRAME CONSTRUCTION
Recommended Spacing is at least 16”; Minimum Spacing is 12”
Figure 2 Spacing
Frame:
Up to 58” Max.
Sq. I.D.
(Must be equal
to or larger than
Wall Opening)
Wall Opening:
56 1/2” Min.
58” Max.
Sq. I.D.
For optimum performance, both the Wall Opening and the Frame square Inside Dimension (ID) should be 58”.
However, the Wall Opening ID may be between 56 1/2” and 58” square. The Frame ID may also be between 56 1/2”
and 58” square, but must be equal to or larger than the wall opening. See Figures 2 (for 2x4 frame construction) or
3 (for 4x4 post construction) below.
Frame:
Up to 58” Max.
Sq. I.D.
(Must be equal
to or larger than
Wall Opening)

FAN ASSEMBLY
Before installation of fan, check carefully for shipping damage which may result in blade misalignment, deformed
parts or other damage. After motor has been mounted, check pulley alignment and belt tension. (For details on
pulley alignment, refer to Page 10 in this booklet.). Before connecting the power source, check motor nameplate to
be sure the correct phase and voltage will be applied. Single phase motors are shipped from the factory wired for
230 volt operation. For low voltage operation see motor manufacturer’s instructions on nameplate. Make sure
propeller turns freely without striking fan frame or any foreign object which may interfere with its operation. Note
direction arrow on orifice to make sure propeller is rotating in the correct direction when power is applied.
As shown on Page 4, the fan may be assembled with the motor either below the fan shaft (Bottom Mount) or above
the fan shaft (Top Mount). Before mounting the motor, determine whether Top Mount or Bottom Mount best suits
your needs.
Motor Mounting
The motor bracket must be rotated from its factory-mounted shipping position:
Bottom Mount: With the fan positioned such that the motor bracket is towards the lower left or lower right of the
fan panel, remove the motor bracket from its shipping position and bolt it to the uprights as shown in Figure 4.
Table 1 shows the upright mounting holes (counting up from the bottom of the upright) to use to mount the motor
bracket.
Top Mount: With the fan positioned such that the motor bracket is towards the upper left or upper right of the
fan panel, remove the motor bracket from its shipping position, and bolt it to the uprights as shown in Figure 5.
Table 1 shows the upright mounting holes (counting down from the top of the upright) to use to mount the motor
bracket.
Page 3
Figure 4 — Bottom Mount Figure 5 — Top Mount
Note: It may be necessary to slightly adjust the motor bracket in its slots to achieve proper belt tension.
Place the motor on the motor bracket and bolt it down using the hardware provided. Make sure the motor base
remains flat against the motor bracket.
The motor pulley should be placed on the motor shaft with the “set screw” side of the pulley toward the motor. Using
a long straight bar, check the alignment of the motor pulley, the belt tensioner sheave, and the fan hub pulley. If
necessary, loosen the motor pulley set-screw and/or the motor mounting bolts and adjust as necessary. To align the
belt tensioner, loosen the two tensioner bracket bolts and adjust the position of the tensioner. Re-tighten pulley set
screw, motor mounting bolts, and the tensioner bracket bolts as necessary. IMPORTANT: Motor bracket bolts must
be secured to maintain proper belt alignment and tension.
Once the motor has been properly mounted and the pulleys have been aligned, complete the assembly of the fan by
threading the belt over the fan hub pulley groove, motor pulley, and belt tensioner. The factory mounted tensioner
should be set for proper belt tension. If a tension adjustment becomes necessary, refer to Page 9 in this booklet.
Again, check for belt alignment using a straight bar as described above. Next, turn the blade assembly by hand to
insure free rotation. The fan is now ready to be mounted onto the wall.
Motor
Power, Frequency
Bottom
Mount
Top
Mount
1 HP, 60 Hz 1 & 2 2 & 4
1 ½ HP, 60 Hz 1 & 3 3 & 4
1 HP, 50 Hz 1 & 3 3 & 4
1 ½ HP, 50 Hz 2 & 3 3 & 4
Table 1 — Mtr. Bkt. Hole Locations
Motor
Bracket
Motor
Bracket

Page 4
Fan Support
To help hold the fan in place for mounting, a support such as a 2x4 or angle iron (not supplied) should be fastened to
the wall below the Wall Opening. This Fan Support should be located a small distance below the top of the lower
Frame board such that the fan is centered over the wall opening when placed on the Fan Support. Refer to Figure 6
to determine the distance between the Frame and Fan Support based on the Frame ID (not Wall Opening).
FAN MOUNTING
‘X’ Frame ID ‘X’
58 7/8
57 3/4 1
57 1/2 1 1/8
57 1 3/8
56 1/2 1 5/8
57 1/4 1 1/4
56 3/4 1 1/2
Fan Support
Frame
Wall
Figure 6 — Cross-section of mounting wall
Fan Mounting
With the Fan Support securely in place, lift the fan and place it on the Fan Support against the wall opening. Note
that the entire fan may be rotated to locate the motor to the left or to the right of center as desired. See Figures 8 &
9 for possible configurations. Using the holes on the edge of the fan panel face, fasten the fan into wall (fasteners
not supplied). Caulk the perimeter of the fan panel to seal it.
Once the location of the Fan Support has been
determined, place a level on the Fan Support to
insure that it is perfectly horizontal, and fasten it
to the wall (fasteners not supplied) as shown in
Figure 7.
Top Mount Bottom Mount
Figure 8 — Bottom Mount Configutrations
Figure 7
Figure 9 — Top Mount Configutrations
Level
Fan Support 2x4

CONE ASSEMBLY
Next, the damper door ring assembly should be fastened to the
cone. Note that the damper door ring assembly has a top — where
the door-restraining cable is permanently attached — and a bottom
(where the cable spring is held in place for shipment by a rubber
band). Take the damper door ring assembly, making sure the doors
open downward, and insert it at an angle into the cone as shown in
Figure 15. The top end with the door-restraining cable permanently
attached should be opposite the drain hole in the cone. Once the
entire ring assembly has been placed inside the cone, level the ring
and align the pre-drilled ring holes with the corresponding
overlapping holes in the cone. From the inside of the assembly,
place a 1/4” X 1-1/4” bolt through the holes in the 3-o'clock and 9-
o’clock positions of the ring (locating the drain hole at the 6-o’clock
position), through the Handles, and fasten with two 1/4” whiz-lock
nuts. Continue fastening the door assembly to the cone using two
5/16” X 1/2” self-drilling screws: one adjacent to the drain hole
(bottom), and one on the opposite side (top) of the cone. See
Figure 16.
Page 5
The discharge cone consists of four cone quarter
panels that are joined by an interlocking tab-and-
slot design. The panels used for the top and
sides of the cone are identical. The bottom cone
panel has a 3/4” drain hole located in the middle
of the panel towards the small diameter end.
Begin construction by placing one panel on the
ground. Slide a 2x4 under the slotted edge of
the cone as shown in Figure 10. Next, aligning
the tabs in a second panel with the slots of the
first, join the two panels by inserting the tabs into
the slots — see Figure 11. Fasten the two panels
together using two 1/4” X 3/4” bolts up through
the bottom of the panels and two 1/4” whiz-lock
nuts in the end overlapping holes of the two
panels, as shown in Figure 12. Repeat this
process for the two remaining panels. The 4
panels in the flat is shown in Figure 13.
Now, the cone may be completed by fastening
the fourth panel to the first panel. To do this,
bring the edge of the fourth panel to the edge of the first and insert the tabs into the slots. Fasten the first and
fourth panels using two 1/4” X 3/4” bolts and four 1/4” whiz-lock nuts in the end overlapping holes of the two panels.
The cone should now be placed such that the larger diameter opening is on the ground as shown in Figure 14.
A Handle Mounting Hole is located near the center of the Side Panels. (The Side
Panels are the two panels adjacent to the Bottom Panel, which contains the drain
hole, as shown in Figure 14.) Once all four panels are fastened together, attach
one end of a Handle to the Side Panel using a 1/4” X 3/4” bolt, through the Handle
Mounting Hole of the Side Panel and then through one end of the Handle.
Fasten with a 1/4” whiz-lock nut. Do not fasten the other side of the Handle at this
time. Repeat this process with the other Handle on the other Side Panel.
Figure 15 — Damper Ring Insertion
Figure 14
1/4” Bolt
& Nut
Drain
Hole
Door-Restraining
Cable End
Figure 13 — Cone Panels in the Flat
Bottom
Panel
Figure 10
Figure 12 Figure 11
Handles

CONE MOUNTING
Page 6
After the ring has been
secured, the cone gussets
will be placed on the cone.
NOTE: there are two sets of
two gussets. The longer
set will have a notch on the
end with two holes. The
longer set should be placed
on either side of the cone
drain hole (cone bottom).
The shorter set of gussets
should be placed opposite
the drain hole (cone top).
To attach a gusset, align
the single hole in the gusset
flange with the hole in the
assembly ring and in the
cone at the 45° angles.
Push a 1/4” X 1-1/4” bolt
through the assembly ring,
through the cone, and
through the gusset. Fasten
the bolt with a 1/4” whiz-
lock nut. Repeat this
process for the three other
gussets. Refer to Figure 16
for details. Caulk around
the damper door ring to
prevent light and wind
blown rain water leakage.
To mount the cone assembly, pick the assembly up by the handles and place the top of the smaller end over the fan
panel orifice. Make sure that the drain hole in the cone is at the bottom. Fasten the top cone gussets to the fan
panel using 1/4” X 1-1/4” bolts,1/4” flat washers, and 1/4” whiz-lock nuts. Next, slide the rest of the cone over the
orifice. This process may be aided by gently tapping the sides and bottom of the cone with a rubber mallet or dead-
blow hammer from the inside of the building to allow it to slip over the orifice. Once the cone is in place, fasten the
bottom cone gussets to the fan panel using 1/4” X 1-1/4” bolts, 1/4” flat washers, and 1/4” whiz-lock nuts.
With the cone assembly secured in place, cut and remove the rubber band holding the cable in place and the wires
holding the doors in place. Make sure all 1/4” hardware is tightened securely.
To mount the cone guard, first remove the four bolts/nuts on the guard end of the cone installed during the cone
panel assembly. Then, place eight 1/4” X 2” bolts in the eight holes in the end of the cone from the outside in.
Place a Guard Spacer on each bolt and fasten them with 1/4” whiz-lock nuts. These will serve as the Guard Studs.
See Figures 17 & 18. After the Guard Studs have been fastened, mount the Cone Guard by placing the Guard
eyelets over the Guard Studs and fastening each with another 1/4” whiz-lock nut. While installing the Cone Guard,
take the spring at the end of the door restraining cable, and attach it to vertical guard rib as shown in Figure 19.
Figure 16 — Damper Door Ring Assembled in Cone
Door-Restraining Cable End (Top of Cone)
3-O’Clock Hole
9-O’Clock Hole
Long (Notched) Gussets
Drain Hole
Short
Gusset
Short
Gusset
Figure 18 — Guard Stud Detail
Large Diameter
Cone Edge
Guard Studs
Figure 19 — Door Cable
Guard
Stud
Bolt
Cone
Panel
Guard
Spacer
Whiz-
Lock
Nut
Figure 17

Page 7
Next, mount the spring bracket at the center of the door ring
assembly where the struts intersect. Use two cable ties to
secure the spring bracket as shown in Figure 20. Attach one
end of each spring to the spring bracket. The other end of each
spring should be attached to the inside door hole in the damper
door.
To check for proper damper operation, open the doors fully,
and allow them to close. If either door fails to close properly,
rotate the cone assembly slightly on the fan orifice until both
doors will close properly.
DOOR & GUARD ASSEMBLY/GUARD MOUNTING
Be sure to install the inlet
guard before operation.
The inlet guard is cut to
size at the factory.
However, a clearance
hole must be cut away
for the motor to easily fit
through, as shown in
Figure 21.
Prior to guard
installation, the 3 Guard
Clips and 6 Guard Hooks
must be secured to the
fan frame. The Guard
Clips consist of ‘L’
brackets that are
fastened to the top rail of
the fan frame as shown
in Figure 22 (fasteners
not included). The
Guard Clips should be
spaced such that the Guard wire may slip between the
Guard Clip and the frame. The Guard Hooks should be
screwed into the sides and bottom of the fan frame.
Figure 23 shows the suggested locations of the Guard
Clips and Guard Hooks.
With the Guard
Clips and Hooks in
place, complete
final assembly of
the fan by placing
the Inlet Guard over
the Guard Clips,
and secure the
Guard with the
Guard Hooks.
Figures 24 & 25
show the final
assembled unit.
Figure 24
Spring
Bracket
Cable
Figure 20
Figure 22
Figure 25
Figure 21
Motor
Clearance
27 1/2 25 1/2
12 12
17
17
Figure 23 — Guard Clip & Guard Hook Locations
1
Guard
Hook
Guard
Clip

ELECTRICAL WIRING
WARNING
If the fans are going to be used for livestock building ventilation to support life where
failure could result in loss or injury, the user must provide an adequate backup
ventilation system and a failure alarm system. The user must accept the risk of such
loss or injury from failure of the ventilation system.
All wiring must comply with national, state, and local electrical codes. If fans are to be used for livestock ventilation
to support life where failure could result in loss or injury, and continuous ventilation is essential, it is recommended
that the fans be wired to individual electrical circuits, or at least two circuits per room. Any minimum ventilation
fans should be on individual circuits.
Spin the blade assembly by hand. Make
sure that the blade assembly rotates
freely and did not shift during shipment. If
the blades rub in the fan orifice in the
direction of the fan uprights, it will be
necessary to loosen the four (4) 3/8” bolts
that secure the fan x-braces to the fan
uprights, center the blade assembly, and
tighten the bolts to 25-30 ft-lbs torque. If
the blades rub in the direction
perpendicular to the fan uprights, it will be
necessary to loosen the two (2) 3/8” bolts
that secure the blade assembly’s
hexagonal shaft to the fan x-braces,
center the blade assembly, and tighten
the bolts to 25-30 ft-lbs torque.
Next, the fan drive assembly should be
checked for alignment. The fan drive
assembly must be aligned for proper fan
performance and to minimize pulley and
belt wear. Before wiring and operating
the fan, check that the drive pulley, driven
disc and auto belt tensioner are aligned
by using a straight edge such as a scale
or yard stick. If an adjustment is
necessary, loosen the set screw on the
motor pulley and adjust to proper
alignment. Make sure to retighten the
motor pulley set screw before the fan is
operated. See Figure 24.
BLADE AND BELT ALIGNMENT INSTRUCTIONS
Figure 24 — Detailed View of Properly Aligned Fan Sheaves
Page 8

AUTO BELT TENSIONER
Figure 25 — Motor/Pulley, Tensioner, Disc and
Belt
Figure 26 — Tensioner and Belt Showing Tension
Alignment Marks
Fan rotated and blades removed
for clarity of detail
The Automatic Belt Tensioner comes from the factory mounted and preset for adequate belt tension. If further
tensioning is required, loosen the 3/8” bolt holding the tensioner to the tensioner bracket. Then, using a 15/16”
wrench, rotate the tensioner assembly such that the alignment mark is between mark 1 and 2 on the idler arm
(see Figure 19). Re-tighten the 3/8” bolt. Turn the blade assembly by hand to insure free rotation. Do Not Over
Tension The Belt. This will cause premature belt and bearing failure. To check that the belt tension is not too
high, place a finger midway between the fan pulley and motor pulley and push inward about 1/2”. The force
required to do this is not to exceed 5 pounds.
Front
View
Mark 2
Mark 1
Alignment mark
Page 9

CONSTRUCTION FOR WINTER WEATHER PROTECTION
If your area is subject to snow, consideration must be taken to protect from the possibility of snow and ice
building up on the roof and sliding down onto the fan and cone. One option is to build a small section of roof over
the fan and cone. See Figure 27.
WARNING
Protect Fan and Cone from Snow
and Ice Buildup
WARNING
Fan and/or cone damage caused by this type of external source WILL NOT be
covered by AMERICAN COOLAIR warranties.
Figure 27
During winter months, you may not need to operate all of your fans. It is advisable to seal up those fans which will
not be used during the colder months to minimize heat loss as well as condensation. To do this, turn the fan control
off, and insulate the fan intake.
Page 10

1. With inlet guard not installed, spin the blade assembly by hand and make sure that the blade
assembly rotates freely and did not shift during shipment. If the blades rub in the fan housing, refer
to Page 8 for instructions on centering the blade assembly.
2. Check belt for proper tension.
3. Check motor pulley, driven disc and idler pulley (if present) for proper alignment.
4. Check to make sure all fasteners are properly tightened.
5. Check circuit phase, voltage and wiring connection against that shown on motor nameplate.
6. Check for correct fan rotation.
7. Replace the inlet guard. The fan is now ready for proper operation.
INITIAL STARTUP
MAINTENANCE
CLEANING
x The fan should be cleaned regularly. Always turn the fan off and disconnect the power connection before
cleaning.
x The motor should be wiped with a cloth or a brush. This will keep the motor running cool. DO NOT pressure
wash the motor.
x The blades should be wiped clean to maintain maximum air performance and minimize fan imbalance. DO
NOT pressure wash the center of the disc assembly, or premature bearing failure may be induced.
x The damper door assembly should be wiped clean so that the doors will pivot freely, open completely, and
close securely.
x The interior sides of the fan, wall housing & doors, should be washed properly after disinfecting the house to
prevent rusting. We recommend using Simple Green detergent or a similar product.
CHECK FASTENERS
Inspect all fasteners on the fan. This is a very important safety issue. If any loose hardware is found, tighten it
immediately.
CHECK BELT TENSION
The belt must have proper tension to insure proper fan speed and maximum air performance. Refer to Page 9 if re-
tensioning is necessary.
CHECK DRIVE ALIGNMENT
The belt must be properly aligned in the pulleys to minimize pulley and belt wear. Refer to Page 8 for instructions.
CHECK DOOR-RING GASKET
The door-ring is lined with a foam rubber gasket material. This gasket provides a seal between the door-ring and
the doors, insuring proper door function and minimizing air leakage. This gasket should be checked periodically to
make sure it is intact and properly sealed to the door-ring. If the material should come loose from the door-ring, it
must be re-sealed to the door-ring with appropriate adhesive.
Page 11

WARNING
—– Moving Parts —–
Disconnect power
before servicing the
fan
WARNING
—– High Voltage —–
Disconnect power
before servicing the
fan
WARNING
Precision Bearings
Do Not
Pressure Wash at
blade assembly center
DO NOT INSTALL FAN WITH MOVING PARTS WITHIN 8
FEET OF FLOOR OR GRADE LEVEL WITHOUT A GUARD
THAT COMPLIES WITH OSHA REGULATIONS. DO NOT
USE UNLESS ELECTRICAL WIRING COMPLIES WITH
ALL APPLICABLE CODES. DO NOT WIRE WITHOUT
PROVIDING FOR A POWER SOURCE DISCONNECT AT
THE FAN ITSELF. DO NOT SERVICE EXCEPT BY A
QUALIFIED MAINTENANCE TECHNICIAN AND ONLY
AFTER DISCONNECTING THE POWER SOURCE.
FAILURE TO OBSERVE THESE PRECAUTIONS CAN
RESULT IN SERIOUS INJURY OR DEATH.
WARNING CAUTION
FARM PRODUCTS DIVISION
MEMBER OF AMCA
AMERICAN COOLAIR CORPORATION
P.O. BOX 2300
JACKSONVILLE, FLORIDA 32203
PHONE (904) 389-3646 FAX (904) 387-3449
E-MAIL - [email protected]
Form 912-28-2 (October, 2020)
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