Maintenance of Fan Motor, Fan Blades, and Fan Guard
Inspect and clean the motor, fan guard, and blades. Remove any dirt and grease. Take care when cleaning the fan
blades so as prevent causing misalignment or imbalance. Check to ensure that the hub of the fan blades is secure
to the shaft. If necessary, replace the assembly as follows:
1. If heater has been installed, turn OFF gas and disconnect electric power.
2. Remove access panel and disconnect fan motor wires, capacitor wires at capacitor, and ground screw.
3. Remove assembled parts (fan guard, motor, and fan blade).
4. Disassemble and replace part(s) as needed.
5. Reassemble using replacement part(s) as needed and original parts.
6. Ensure that fan blade is in proper position on shaft (see Figure 31).
Figure 31. Fan Blade Positioning (Refer to Table 27)
Table 27. Fan Blade Positioning
Unit Size
Dimension A*
Inches Millimeters
130, 180 1-5/8 67
260 2 51
310 1-7/8 48
*See Figure 31.
7. Position assembly on heater and attach fan guard.
8. Rotate fan blade to check for adequate clearance. If adjustment is required, loosen mounting screws, reposition
fan guard, and tighten screws. Repeat until assembly is positioned properly.
9. Reconnect fan motor wires in accordance with wiring diagram.
10. Install access panel.
11. Restore electric power to heater and turn ON gas.
12. Follow instructions on lighting instruction plate to light heater.
13. Check for proper heater operation.
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