6
FCE/FCRU IO&M
B51150-003
Wheel-to-Inlet Clearance
The correct wheel-to-inlet clearance is critical to proper
fan performance. This clearance should be verified before
initial start-up since rough handling during shipment could
cause a shift in fan components. Refer to wheel/inlet draw-
ing for correct overlap.
Adjust the overlap by loosening the wheel hub and mov-
ing the wheel along the shaft to obtain the correct value.
A uniform radial gap (space between the edge of the
cone and the edge of the inlet) is obtained by loosening
the bearing bolts and set screws which will allow for cor-
rect repositioning.
Size
Overlap
120-165
3/16”
180-245
1/4”
270-300
5/16”
330-365
3/8”
402
7/16”
Spare Parts
Spare parts are not needed for the first year of opera
-
tion. If spare parts are desired, then it is suggested that a
spare motor and impeller be ordered for direct drive fans.
For belt drive fans, in addition to the motor and impeller, it
is suggested that a spare set of bearings, shaft, sheaves
and belts be ordered.
When ordering spare parts, specify the parts desired,
the fan model number and the fan serial number. Contact
your local sales representative for price and delivery.
Bearing Replacement
The fan bearings are pillow block ball bearings.
1. Follow all local lock-out/tag-out procedures, remove
topcap from unit and unwire the units motor.
2. Loosen the bolts holding the motor and remove the
belt. Inspect the belt for signs of wear and set aside.
3. While supporting the motor, either by the lifting eye
or around the base on the motor, loosen and remove
all the bolts holding the motor. Do not lift motor by its
shaft. Caution: Motors with cast frames can be ex-
tremely heavy and should not be lifted without addi-
tional aid. Set motor aside.
4.
Locate the 4 to 8 bolts on the flat surface of the interior
of the housing. Begin to loosen these bolts and save
the hardware. Note unit may shift during this process.
5. Using the lifting points on the power assembly care-
fully lift the assembly straight up until the wheel clears
all parts of the unit. Set the wheel / shaft / power as-
sembly down in a manner that does not damage the
roof or any component.
6. Measure and record the distance of the wheel from the
support plate.
7. Using a putty knife at the wheel hub, scrape the resin
from the safety plate and retaining bolt.
8. Remove the retaining bolt and safety plate and set
aside.
9. Using either a jewelry screw driver or small drill bit, re-
move the beeswax from the set screw openings and
set screw heads.
10. Remove the wheel and remove the old bearings and
shaft.
11. Install the new shaft to the wheel, safety plate, and re-
taining bolt. Tighten all per the torque values as stated
on page 2.
12.
Using a fiberglass resin repair kit, apply resin per the
manufacture instruction over the safety plate, and re-
taining bolt. Recommend using a Grainger part num-
ber 3RAR9 or equal.
13. Reapply beeswax to protect the set screw heads.
14. Install the new shaft by sliding the bearings to the de-
sired location using the measurement record earlier
and loosely mounting the bearing support. Bearing
bolts and bearing set screws should be loose enough
to allow shaft position later.
15. Follow step 2 through 6 in reserve order to re-assem-
bly unit. Please note the wheel to inlet clear matches
as close as possible the diagram on page below
16. Tighten all hardware per the torque values as stated
on page 2 and follow the
Operation Pre-Start Check
and
Start-Up
listed in this document.
