54
UBXC-UDXC-IOM (01-24) 1042980-0
MAINTENANCE—CONTINUED
Maintenance Procedures—Continued
Maintenance of Fan Motor, Fan Blades, and Fan Guard—Continued
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 25) and that blades are properly spaced (refer
to Table 24).
Figure 25. Fan Spacing
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.
A
Fan
Blade
Motor
Setscrew
A
Motor
Fan
Blade
Setscrew
UNIT SIZES 30–250
UNIT SIZES 300–400
Table 24. Fan and Motor Assembly Specifications
Setscrew Torque (Inch-Pounds ±10)
80 120 130
Unit Size (MBTUh)
30 45 60 75 100 125 150 175 200 225, 250, 300 350 400
Dimension A (Inches (mm))*
1 (25) 9/16 (14) 1-1/2 (38) 2-1/8 (54) 2-3/8 (60) 2-5/16 (59) 2-3/8 (60) 2-1/8 (54) 1-5/8 (41) 2 (51) 1-7/8 (48) 1-3/8 (35)
*See Figure 25.
To Next Page
Loading...
