Routine Maintenance
60 CLCH-SVX009A-EN
Fans
Inspecting and Cleaning Fans
Fan sections of air handlers should be inspected every six
months at a minimum or more frequently if operating
experience dictates. If evidence of microbial growth
(mold) is found, identify and remedy the cause
immediately. Refer to “Troubleshooting” on page 62 for
possible causes and solutions. To clean the fan section:
1. Disconnect all electrical power to the unit.
2. Wearing the appropriate personal protective
equipment, remove any contamination.
3. Vacuum the section with a vacuum device that uses
high-efficiency particulate arrestance (HEPA) filters
with a minimum efficiency of 99.97 percent at
0.3 micron particle size.
4. Thoroughly clean any contaminated area(s) with a
mild bleach and water solution or an EPA-approved
sanitizer specifically designed for HVAC use.
5. Immediately rinse the affected surfaces thoroughly
with fresh water and a fresh sponge to prevent
potential corrosion of metal surfaces.
6. Allow the unit to dry completely before putting it back
into service.
7. Be careful any contaminated material does not contact
other areas of the unit or building. Properly dispose of
all contaminated materials and cleaning solution.
Bearing Set Screw Alignment
Align bearing set screws for belt-drive fans as illustrated in
Figure 53. See Tab le 16 for set screw torque
measurements.
Figure 52. Resetting low limit switch for horizontal DDP fan units sizes 8 and 14-30
Removable
access panel
Low limit freeze stat
Panel removed
from unit
Screw: 10-16 x 0.750 self-driller
Remove all from perimeter of panel
WARNING
Rotating Components!
The following procedure involves working with rotating
components. Disconnect all electric power, including
remote disconnects before servicing. Follow proper
lockout/ tagout procedures to ensure the power can
not be inadvertently energized. Secure rotor to ensure
rotor cannot freewheel. Failure to secure rotor or
disconnect power before servicing could result in
rotating components cutting and slashing technician
which could result in death or serious injury.
Figure 53. Alignment
Align set screws
Align set screws
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