Vent Fan Impeller Assembly (continued)
Note: When REPLACING the Vent Fan Impeller, a NEW Vent Fan Motor MUST also
be installed (ref. 5.2.5). Impeller and Motor MUST be considered a 'matched set'.
Do NOT Re-use Vent Fan Impeller.
Position the Impeller onto the motor shaft taking care not to damage the threads on the end of the shaft.
Note: The motor shaft is "D" shaped, so the Impeller will only go on when the
shaft and the Impeller are aligned.
While holding the Impeller to stop it from rotating, use a 5/16" socket to secure the NEW lock nut.
Using a feeler gauge, check that the gap between the back face of the rim of the Vent Fan Impeller (large end)
and the Vent Fan Housing is not less than 0.015" or more than 0.030". Re-shim as required.
Figure 5-2.9. Detail, Vent Fan Impeller Assembly
Check that the Vent Fan Impeller spins freely.
Install Vent Fan Shroud (ref. 5.2.3)
Install Vent Fan Assembly to the Heater (ref. 5.2.1)