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
