BCX-SVX002A-EN
115
Fans
WARNING
Rotating Components!
Failure to disconnect power before servicing could
result in rotating components cutting and slashing
technician which could result in death or serious
injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized.
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 “Diagnostics and Troubleshooting,” p. 123 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
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
Fan Motors
Inspect fan motors periodically for excessive vibration or
temperature. Operating conditions will vary the frequency
of inspection.
Torque Rating
Check and adjust fan wheel set screws whenever a
component is removed or an adjustment is made. Refer to
for recommendations.
Table 39. Recommended torques
Fan wheel
screw
Torque (in·lb)
Ft·lb N·m
120-130 10.0-10.8 13.6-14.7
Table 40. BCHE/BCVE fan, filter, and mixing box general data
Unit Size 12 18 24 36 48 54 60 72 90 120
Nominal CFM 400 600 800 1200 1600 1800 2000 2400 3000 4000
Airflow
Minimum cfm 250 375 500 750 1000 1125 1250 1500 1875 2500
Maximum cfm 500 675 1000 1600 2000 2400 2500 3000 4000 5000
Fan Data
Fan wheel, in.
(dia X width)
9 x 4 9 x 4 9 x 4 9 x 6 12 x 8 9 x 9 12 x 8 9 x 9 12 x 9 12 x 12
RPM range
800-2500 800-2500 800-2500 800-2500 600-1700 800-2500 600-1700 800-2500 600-1800 600-1800
Motor hp
0.5-1.0 0.5-1.0 0.5-1.0 0.5-2.3 0.5-3.5 1.0-3.5 1.0-3.5 1.0-3.5 1.0-5.0 1.5-5.0
Unit Flat Filter (BCHE)
(Qty) Size (1) 12 x 20 (1) 12 x 24 (1) 12 x 24
(1) 12 x 12
(1) 12 x 24
-
(1) 16 x 16
(1) 16 x 25
-
(2) 16 x 25
(1) 20 x 24
(1) 24 x 24
(3) 18 x 24
Area, sqft
1.67 2.00 2.00 3.00 - 4.56 - 5.56 7.33 9.00
Velocity, ft/min
240 300 400 400 - 395 - 432 409 444
Unit Flat Filter (BCVE)
Routine Maintenance
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