Cool Air MNEFDD54 Manual

MNEFDD54 & MNBCDD54
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 [phone] FAX [phone]
E-MAIL - [email protected]
MNEFDD54L * MNEFDD54M * MNBCDD54L * MNBCDD54M
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, (4) Housing Sheets with (4) Corner Deflectors, Damper Door Ring Assembly, Cone (4 cone panels and 4 cone
gussets), Rear Housing Guard, Front Cone Guard, and Hardware Package
Figure 1
67 1/4
14 3/8
61
61 73
Dimensions
in inches

FRAMING
Page 2
FRAME CONSTRUCTION
RECOMMENDED MINIMUM SPACING IS 16”
Figure 2
58 3/4” SQ. I.D. Spacing
POST CONSTRUCTION
Figure 3
4” x 4” Post
58 3/4” SQ. I.D.

FAN HOUSING ASSEMBLY & INSTALLATION
Figure 4
Top Housing Sheet
Side Housing Sheet
Guard Clip
Overlapping Corner Hole
Guard Latch
If the fan and housing are factory assembled, you may skip this paragraph. The housing consists of 4
housing sheets that must be fastened together. The side sheets are identical. The bottom sheet has five 7/8-inch
diameter drain holes. Assembly should be done inside the building in which it will be placed. To assemble the
housing, place bottom sheet so that the flange on the long side of the sheet is down. Then take the sides and
place them at 90° to the bottom and over the flange of the bottom sheet. Take the top and place it at 90° to the
sides and over the flange of the side sheets. The two inside holes, as well as the hole in the corner at the
intersection of the two flanges, should overlap. Using two 1/4” x 3/4” bolts and two 1/4” whiz-lock nuts, fasten the
two sheets at the overlapping holes on the inside corner of the two sheets. Push the bolts from the outside in, and
thread the nuts on the inside. This process should be repeated for the two remaining sheets. After the fourth
sheet has been fastened to the third, it should also be fastened to the first, completing the housing. See Figure 4A.
Next, lift the housing into place in the wall opening. Using the 4 overlapping corner holes and the 3 individual
holes in each sheet flange, fasten the housing to the building frame (hardware not provided).
After securing the housing to the frame, attach the 2 guard latches each to the side and bottom housing sheets as
shown in Figure 4 using the #10 screws provided. The screws should go through the latch, through the housing,
and into the building frame. In the same manner, attach the two guard clips to the top housing sheet using #10
wood screws as shown in Figure 4.
Install flashing around the housing and caulk to properly seal fan to wall.
Page 3
Figure 4A
Housing
Sheet
Overlap

FAN ASSEMBLY AND MOUNTING
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 8 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.
Motor Mounting
If the fan and housing are factory assembled, then the motor bracket is already mounted in the correct position and
this section may be skipped. If the fan is not factory mounted in the housing, the motor bracket will need to be
moved from its shipping position.
1. If needed, remove the motor bracket from its shipping position and bolt it to the uprights using the 2nd & 3rd
holes from the bottom of the uprights. Note: It may be necessary to slightly adjust the motor bracket in its slots
to achieve proper belt tension.
2. The rotary belt tensioner (if included) should be mounted on the right upright (when viewed from the back of the
fan — see Figure 5) in the 7th & 8th holes from the bottom.
3. Place the motor on the motor bracket and bolt it down using the hardware
provided. Make sure the motor base remains level.
4. 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 and the fan hub pulley. If necessary, loosen the motor pulley
set-screw and/or the motor mounting bolts and adjust as necessary. Re-tighten
pulley set screw and motor mounting bolts. 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 (if included) as shown in Figure 5. For
Model MNBCDD, the tensioner is assembled and should be set for proper belt
tension. If a tension adjustment becomes necessary, refer to Page 8 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 into the wall housing, if not already factory assembled.
Fan Mounting
If the fan is not factory mounted in the housing, lift the fan (from the outside of the building) and place it inside the
assembled wall housing so that the fan panel is flush with the end of the wall housing. Using twenty 5/16” X 3/4”
bolts and twenty 5/16” whiz-lock nuts, fasten the fan
into place in the housing. Caulk around the
perimeter of the fan panel to seal the housing.
For proper fan operation, the corner deflectors must
be fastened to the fan. First, place the deflector
inside the housing such that the two shorter sides
(with the flanges and mounting holes) are against
the housing, and the longer side is against the fan
panel. The holes in the deflectors should align with
the holes in the housing. Fasten each deflector
using four of the ¼” x ¾” self-tapping screws
provided. The screws must be fastened from the
outside of the housing through the housing and then
through the deflector. See Figure 6.
Weatherproofing
IMPORTANT: To prevent rainwater intrusion, caulk the outside top seam between the top of the fan and the
housing.
Figure 5
Page 4
Figure 6
Corner
Deflector
¼” x ¾”
Self-Tap
Screws

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 9. 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) 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 10.
Page 5
The discharge cone consists of four cone quarter panels. 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 finding the bottom cone quarter panel and one
of the other panels (side panel). Place these two panels such
that the edge of the side panel overlaps the bottom panel and
the holes on the overlapping edges of the two panels are
aligned, with the larger cone diameter down. Using top hole
and the middle 3 overlapping holes in the panels (skipping the
2nd and bottom set of holes), fasten the cone panels together
using four 1/4” X 3/4” bolts pushed from the inside out, and
four 1/4” whiz-lock nuts. Repeat this process for the third and
fourth panels until the cone is completed. Figure 7 shows the
cone assembly at 3/4 completion.
When assembling the last panel, it
may be difficult to place the last 1 or
2 bolts into the last panel joint.
These last 1 or 2 bolts may be left
out until the cone is mounted as
described on the next page.
To prevent rainwater leakage, the top panel should overlap the side quarter panels, and
both side panels should overlap the bottom panel. See Figure 8 for details. Tighten the
fasteners in the middle holes securely, but only finger-tighten the hardware in the top set
of holes at this time.
A handle mounting hole is located near the center of the Top and Side Panels. Insert
three 1/4” X 3/4” bolts — one for each panel — pushed from the inside out, and fasten
a 1/4” whiz-lock nut on each. These will serve as the Handle Mounting Studs.
Side Panels
Top Panel
Bottom Panel
Figure 8 –
Cone Panel Overlap
Figure 7 — Cone Assembly at 3/4 Completion
Top Hole
Middle
Holes
Door-Restraining
Cable End
Drain Hole
Figure 9 — Damper Ring Insertion

Figure 11 — Handle Placement
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 10 for
details. Caulk around the damper door ring to prevent light and wind blown rain water leakage.
To aid in cone mounting, a set of handles is included with each order of
fans. To mount the handle, place one end on the Handle Mounting Studs
(described on Page 5) on one of the side sheets, and place the other end
on the 3 or 6 o’clock ring mounting bolt. Repeat this process on the
opposite side for the other handle. Figure 11 shows the handle placement.
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 and 1/4” flat washers. 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 and 1/4” flat washers.
Once the cone assembly is secured in place, cut and remove both the
rubber band holding the cable in place, and the wires holding the doors in
place. Also, complete the cone assembly by placing the 1 or 2 remaining
bolts in the overlapping cone panel holes and fasten with 1/4” whiz-lock
nuts. At this time, tighten all 1/4” hardware securely, including the cone
bolts nearest the fan panel.
Figure 10 — 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

Page 7
To mount the cone guard, place eight 1/4” X 1-1/4” bolts in the eight remaining holes in the end of the cone from the
outside in, and fasten them with 1/4” whiz-lock nuts. These will serve as the Guard Studs. See Figures 12 & 13.
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
below the 3rd ring (from the center) of the guard. See Figure
14.
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 15. 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 assembly slightly on the fan orifice until both doors
will close properly. With the cone secured in place, remove the
Handles for use on the next fan.
GUARD MOUNTING
Once the unit is assembled, the inlet guard
must be in place before operation. To mount
the guard, center it over the fan housing.
Then, slip the guard over the two guard clips
on the top housing flange. To secure the
guard, close the 6 guard latches over the
guard wire. The installation of the unit is now
complete. See Figure 16 for details.
Figure 17 — Assembled Unit
Figure 16
Guard Clip
Guard Latch
Figure 15 — Spring & Bracket Assembly
Spring
Bracket
Cable
Ties
Figure 13 — Guard Stud Detail
Large Diameter
Cone Edge
Guard Studs
Guard
Stud
Bolt
Cone
Panel
Guard
Eyelet
Whiz-Lock
Nuts
Figure 12 Figure 14 — Door Cable

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 either side of the fan
orifice, 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. If
the blades rub in the fan orifice at the top
or bottom, 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.
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 17.
BLADE AND BELT ALIGNMENT INSTRUCTIONS
Figure 17 — Detailed View of Properly Aligned Fan Sheaves
Page 8

AUTO BELT TENSIONER
Figure 18 — Motor/Pulley, Tensioner, Disc
and Belt Figure 19 — Tensioner and Belt Showing Tension Alignment Marks
Blades removed for clarity of detail
For the MNBCDD model, the Auto 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.
If an Auto Belt Tensioner is ordered for use with an Model MNEFDD fan, use the instructions included in the ABT
packaging for proper installation and use.
NOTE: The Auto Belt Tensioner comes standard with Model MNBCDD, and is an optional accessory for Model
MNEFDD.
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 20.
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 20
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
• The fan should be cleaned regularly. Always turn the fan off before cleaning.
• The motor should be wiped with a cloth or a brush. This will keep the motor running cool. DO NOT pressure
wash the motor.
• 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.
• The damper door assembly should be wiped clean so that the doors will pivot freely, open completely, and
close securely.
• 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.
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 [phone] FAX [phone]
E-MAIL - [email protected]
Form 912-23-4a (October, 2018)