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FAXA-SVX01B-EN
Maintenance
maintenance
procedures
Fan and Drive
Perform the following procedures
according to the “Periodic Maintenance
Check List”. Reference Figure M-MP-3 for
proper fan shaft and motor alignment.
WARNING
Hazardous voltage!
Disconnect all electrical power
including remote disconnects before
servicing unit. Follow proper lockout/
tagout procedures to ensure power
cannot be inadvertently energized.
Failure to do so can cause death or
serious injury.
1. Rotate the fan wheel to be sure it turns
freely in the proper direction and is not
rubbing on the fan housing, inlet, or inlet
guide vanes. If necessary, center the
fan wheel again.
2. Check the position of both shafts. Fan
and motor shafts should operate
parallel to each other for maximum belt
and bearing life. Shim as necessary
under the motor or fan bearings to
obtain proper alignment.
3. Check the fan motor sheave alignment
with straight edge or a tightly pulled
string. For sheaves of different widths,
place a string in the center groove of
each sheave and pull it tight for a center
line.
4. Once the sheaves are properly aligned,
tighten sheave set screws to proper
torque.
5. Check belt tension.
6. If required, adjust belt to the minimum
recommended tension.
7. Retighten bearing set screws to the
proper torques after aligning the
sheaves.
8. Check the fan bearing locking collars
for tightness on the shaft. To tighten the
locking collar, loosen the set screw and
slide the collar into its proper position
over the extended end of the inner
case. Tighten the set screw.
9. During air balancing, verify the sheave
alignment, belt tension, and that the
shaft is parallel.
Figure M-MP-3. Fan shaft and motor sheave alignment
putting the system back into service.
8. Determine and correct the cause of
any microbial contamination.
9. Be careful that the contaminated
material does not contact other areas
of the unit or building. Properly dispose
of all contaminated materials and
cleaning solution.
Inspecting and Cleaning the Fans
Inspect the fan section every six months
or more frequently if operating
experience dictates. Clean accumulated
dirt and organic matter on the fan interior
surfaces following the procedure below:
1. Disconnect gas supply and all electrical
power to the unit.
2. Don the appropriate personal
protective equipment (PPE).
3. Use a portable vacuum with HEPA
filtration to remove the loose dirt and
organic matter. The filter should be
99.97% efficient at 0.3 micron particle
size.
4. If no microbial growth (mold) exists,
thoroughly clean the fan and
associated components with an
industrial cleaning solution. Carefully
follow the cleaning solution
manufacturer’s instructions regarding
personal protection and ventilation
when using their product.
5. If microbial growth is present, remove
the contamination (Step 2) and
thoroughly clean the affected area with
an EPA-approved sanitizer specifically
designed for HVAC use. Carefully
follow the sanitizer manufacturer’s
instructions regarding the product
usage.
6. Rinse the affected surfaces thoroughly
with fresh water and a fresh sponge to
prevent potential corrosion of metal
surfaces.
7. Allow the unit to dry completely before
putting it back into service.
8. Ensure that contaminated material
does not contact other areas of the unit
or building. Properly dispose of all
contaminated materials and cleaning
solution.
Determine the cause of any microbial
growth (mold) and take action to ensure it
does not reoccur.