Cool Air MNBCDD36J Manual

MNBCDD36 & MNEFDD36
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]
MNBCDD36J * MNBCDD36K * MNEFDD36J * MNEFDD36K
MNBCDD36J-RM * MNBCDD36K-RM
MNEFDD36J-RM * MNEFDD36K-RM
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, Damper Door Assembly, Cone (4 cone panels and 4 cone gussets), Rear Housing Guard,
Front Cone Guard, and Hardware Package
Figure 1
48 1/2
14 3/8
A
A 48 1/2
Fan A
DD36 47
DD36-RM 43
Dimensions
in inches

FRAMING
FRAME CONSTRUCTION
RECOMMENDED MINIMUM SPACING IS 12”
POST CONSTRUCTION
Page 2
Figure 2
DD36:
44 3/4” SQ. I.D.
DD36-RM:
40 3/4” SQ. I.D. Spacing
Figure 3
4” x 4” Post
DD36:
44 3/4” SQ. I.D.
DD36-RM:
40 3/4” SQ. I.D.

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 top and side sheets are identical. The bottom
sheet has two 1-inch diameter drain holes. Assembly should be done inside the building in which it will
be placed. To assemble the housing, place one sheet so that the flange on the long side of the sheet is
down. Then take another sheet and place it at 90° to the first so that its flat short end is overlapped by
the flanged short end of the first sheet. 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.
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.
FAN HOUSING ASSEMBLY & INSTALLATION
Figure 4
Top Housing Sheet
Side Housing Sheet
Guard Clip
Overlapping Corner Hole
Guard Latch
Page 3

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 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
holes. If the fan is not factory mounted to the housing, the motor bracket will need to be moved from it’s
shipping position.
1. If needed, remove the motor bracket from its shipping position and bolt it to the uprights using the 2nd
and 3rd holes (2nd & 4th holes for Model MNEFDD or MNBCDD-RM) 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. Place the motor on the motor bracket and bolt it down using the 5/16” hardware provided. Make sure
the motor base remains level.
3. 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
Figures 5 & 6. 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 to 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
twelve 5/16” X 3/4” bolts and twelve 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.
Weatherproofing
IMPORTANT: To prevent rainwater intrusion, caulk the outside top seam between the top of the fan and
the housing.
Page 4
Figure 5 — MNBCDD Figure 6 — MNEFDD

The discharge cone consists of four cone quarter panels. Begin construction by placing two cone quarter
panels such that the edges overlap and the four holes on the overlapping edges are aligned, with the
larger cone diameter down. Using top and middle overlapping holes in the panels (as shown in Figure 7),
fasten the cone panels together using two 1/4” X 3/4” bolts pushed from the inside out, and two 1/4”
whiz-lock nuts. Tighten the fasteners in the top holes securely, but only finger-tighten the hardware in the
middle set of holes at this time. Repeat this process for the third and fourth panels until the cone is
completed. To prevent rain water leakage, the top panel should overlap both side panels, and the side
panels should overlap the bottom panel.
CONE ASSEMBLY
Next, invert the cone so that the larger
diameter is up. Using four 1/4” flat
washers, insert four 1/4” X 2-3/4”
Guard Stud Bolts into the overlapping
holes on the edge of the cone panels
from the outside in. Place a Guard
Spacer over each Guard Stud Bolt.
Next, place a 1/4” whiz-lock nut on
each Guard Stud Bolt and tighten
securely, creating the guard studs as
shown in Figures 8 & 9.
Now, tighten ALL of the 1/4” cone
hardware securely. The guard is now
ready to be mounted. Take the guard,
and with the eyelets at the ends of the
guard ribs pointing out of the cone,
slide the guard inside the cone. The
eyelets at the end of the guard ribs
should be placed over the guard studs.
With the guard in place, a 1/4” whiz-
lock nut should be placed on the guard
studs and tightened to secure the
guard. Figure 10
Figure 9
Large Diameter
Cone Edge
Guard
Stud
Figure 8 — Guard Stud Assembly
Page 5
Figure 7 — Cone Assembly
Middle Hole
Top Hole
Guard Stud Bolt:
1/4” X 2-3/4”
Cone Panel
Guard Spacer
Whiz-Lock
Nut
Flat Washer

Next, 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. 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 hole in the shorter 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 Figures 12 and 13 for details. Caulk around the
damper door ring to prevent light and wind blown rain water leakage.
Once the guard is in place, the damper door ring
assembly should be fastened to the cone. First, invert
the cone again so that the guard end is on the ground.
Take the damper door assembly, making sure the
doors open downward, and insert it at an angle into
the cone as shown in Figure 11. The end with the
door restraining cable 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 (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-
tapping screws: one above the Drain Hole (bottom),
and one on the opposite side (top) of the cone.
Figure 12
Door Cable End
Figure 11
Drain Hole
Door Cable
3-O’Clock Hole
9-O’Clock Hole
Drain Hole
Long (Notched) Gussets
Figure 13
Door Cable
Short Gusset
DAMPER DOOR INSTALLATION
Page 6

Page 7
To mount the cone assembly, pick the assembly up and
slide the smaller end over the fan panel orifice. Make
sure that the drain hole in the cone is at the bottom.
Fasten the gussets to the fan panel using 1/4” X 1-1/4”
bolts, 1/4” flat washers, and 1/4” whiz-lock nuts. Once
the cone assembly is secured in place, take the spring at
the end on the door restraining cable, and attach it to
vertical guard rib above the 2nd ring from the bottom 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 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, 1) make sure the door rods are aligned exactly
vertically. If necessary, rotate the cone/door assembly
slightly on the fan orifice until both door rods are vertical.
2) make sure the top of the door assembly is leaning
0.5° - 2° toward the building. To do this, place a level on
each of the doors when closed. If the level does not
indicate a slight lean towards the building, shim the fan
housing.
CONE AND 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.
See Figure 16 for details.
Figure 17 — Assembled Unit
Figure 16
Guard Clip
Guard Latch
Figure 15 — Spring and Bracket Assembly
Spring
Bracket
Cable Ties
Figure 14 — Door Restraining 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 18.
BLADE AND BELT ALIGNMENT INSTRUCTIONS
Figure 18 — Detailed View of Properly Aligned Fan Sheaves
Page 8

AUTO BELT TENSIONER BELT TENSION INSTRUCTIONS
Figure 19 — Motor/Pulley, Tensioner, Disc
and Belt for Model MNBCDD. (The
Tensioner is located on the opposite
upright for Model MNEFDD)
Figure 20 — 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 21). 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 a Model MNEFDD fan, use the instructions included in
the ABT packaging for proper installation and use.
NOTE: The Auto Belt Tightener 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 21.
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 21
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 circuit phase, voltage and wiring connection against that shown on motor nameplate.
5. Check for correct fan rotation.
6. 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 912-25-2a (October, 2018)