Beckett AF Manual page 20

Section: Perform Regular Maintenance
Figure 12. Blower wheel assembly
Replace the blower wheel:
1. Turn off all power to the burner before servicing.
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 fi gure 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 contacts
feeler gauge.
○
Rotate the blower wheel until the setscrew is
centered on the fl at of the motor shaft. Tighten the
setscrew to secure the wheel.
7. DO NOT use a motor that has endshield
openings 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".
20
Use a Feeler Gauge to set the gap to;
+
AF = 0.125 1/64 inch
+
AFG = 0.030 1/64 inch
SK9190