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Routine Maintenance
Fans
WARNING
Rotating Components!
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. 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.
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," p. 74
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
75. See
Table 17, p. 64
measurements.
72
for set screw torque
Figure 75. Bearing set screw alignment
Torque Requirements
Refer to
Table 19
for minimum torque of motor mounting and
bearings bolts. Refer to
Table 17, p. 64
torque.
Table 19. Minimum hex head bolt torque in lb.-ft.
(Grade 5 bolts)
Size (inches)
Thread Designation
1/4-20
1/4-28
65/16-18
5/16-24
3/8-16
3/8-24
7/16-14
7/16-20
1/2-13
1/2-20
9/16-12
9/16-18
5/8-11
5/8-18
3/4-10
3/4-16
7/8-9
7/8-14
1-8
1-14
Note: Soft metric conversions are not acceptable for screw and hex sizes.
for minimum set screw
Minimum Torque
UNC
6
UNF
7
UNC
14
UNF
16
UNC
24
UNF
28
UNC
42
UNF
45
UNC
69
UNF
83
UNC
99
UNF
118
UNC
150
UNF
176
UNC
254
UNF
301
UNC
358
UNF
422
UNC
500
UNF
602
CLCH-SVX009L-EN
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