To clean the blower wheel:
1. Remove the blower housing:
a. Remove the screws on the external side of the duct panel that fasten the housing to the duct panel
assembly.
b. Remove the side access panel and unscrew the mounting bracket that fastens the blower housing to
the internal partition panel of the control box assembly.
c. Make sure that the blower housing is supported by hand before completely removing the mounting
bracket.
d. Slide the blower housing from the rails of the duct panel and place it outside the unit.
2. Remove the blower wheel from the housing:
a. Loosen the set screw which secures the wheel to the motor shaft.
b. Loosen the three mounting legs of the motor by removing the bolts that fasten the mounting legs to
the housing.
c. Slide out the motor assembly (motor, belly band and the 3 mounting legs) from the hub of the wheel.
d. Remove the filler panel at the discharge end of the blower housing by removing the two screws that
fasten it to the housing.
e. Ensure proper reassembly by marking wheel orientation. Remove the wheel from the housing.
3. Remove the caked on dirt from the wheel and the motor using a brush.
4. Remove lint and dirt accumulations from the wheel and housing with a vacuum cleaner, using a soft brush
attachment.
5. Remove grease and oil with a mild solvent.
6. Reassemble
a. Slip the wheel back in the housing with the hub set screw parented in the correct direction.
b. Install the filler panel.
c. Reinsert the motor assembly in the wheel hub and align the mounting legs with the housing mounting
hold locations.
d. Tighten the mounting bolts to fasten the motor assembly with the housing.
e. Center the wheel in the housing by sliding it, align the flat end of the shaft with the set screw and
tighten the set screw.
f. Slide back the blower housing into the mounting rails in the duct panel and install the mounting
bracket back in its position.
g. Install the screws on the external side of the duct panel to fasten duct panel with the housing.
h. Replace the side access panel.
Table 3 – Air Filter Pressure Drop (in. wg.)
* Throwaway Installed Field Filter
Filter Size
inch (mm)*
Air Flow Rate (CFM)
700 800 900 1000 1100 1200 1300 1400
1500 1600 1700 1800 1900 2000 2100
24x30x1
0.03 0.04 0.05 0.06 0.07 0.07 0.08 0.09
0.1
-
-
-
-
-
-
(610x762x25)
24x36x1
-
-
-
-
-
0.06 0.07 0.07 0.08 0.09 0.09
0.1
0.11 0.12 0.13
(610x914x25)
Table 4 – Accessory Electric Heat Pressure Drop (in. wg.)
Heater kW
Air Flow Rate (CFM)
800
1000
1200
1400
1600
1800
2000
4.6-18.4
0.033
0.037
0.042
0.047
0.052
0.060
0.067
WARNING
ELECTRIC SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Disconnect electrical power, and install lockout tag to the unit before cleaning and lubricating the blower motor
and wheel.
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