Beckett AF Manual page 21

Perform regu|ar maintenance
Replace the blower wheel:
1. Turn off all power to the burner before servic-
ing.
2. Disconnect the burner motor wires.
3. Remove the bolts securing the motor to the
burner housing.
4. Remove the motor and blower wheel.
5. Remove the existing blower wheel.
6. Referring to the figure below, slide the new
blower wheel onto the shaft.
• Use a feeler gauge to set the wheel-to-motor
gap, as shown below. (AF = 0.125 +1/64 inch,
AFG = 0.030 +1/64 inch)
• Slide blower wheel toward motor until it con-
tacts feeler gauge.
• Rotate the blower wheel until the setscrew is
centered on the flat of the motor shaft. Tighten
the setscrew to secure the wheel.
7. DO NOT use a motor that has endshield open-
ings outside the blower wheel circumference
(represented by the dashed line).
8. Install the motor on the burner housing. Tighten
screws. Reconnect wires.
9. Restore power, start the burner and perform
combustion tests. Refer to the section "Set
combustion with test instruments".
Figure 12. Blower wheel assembly
SK9190
Use a Feeler Gauge to set
the gap to;
AF = 0.125 4-1/64 inch
AFG = 0.030 4-1/64 inch
6104BAFG R04 Page 21