L.B. White Pilot - Manual (Page 61)

Models 346/348, 408/410, AB200, AB250
Fan and Motor
Servicing
Instructions
Cleaning tthe FFan:
1. Shut off the gas supply to the heater and disconnect
the heater from its electrical supply.
2. Open or remove the access panel on the end of heater
opposite burner.
3. Disconnect the motor leads.
4. Remove the screws that secure the motor mount plate
to the fan housing.
5. Lift and pull the motor and fan assembly from housing.
6. Clean the fan wheel using a soft brush, rag, or
compressed air, paying particular attention to
individual fan blades to remove dirt build up.
Motor aand FFan R Replacement:
Follow steps 1 - 5 above and then proceed as follows:
1. Loosen the set screw(s) on the fan wheel.
2. Pull the fan wheel from the motor shaft. Use a wheel
puller, if necessary. All L.B. White fan wheels
incorporate a wheel puller groove on the fan hub to
assist in fan removal.
3. Remove the nuts that hold the mounting plate to the
motor.
4. To reinstall motor and wheel, reverse these
procedures.
IMPORTANT
■ Make sure that the fan does not rub on the inlet ring
of the fan housing.
■ Make sure set screw(s) of fan are on flats of motor
shaft when tightening.
■ Fan wheel to motor mount plate spacing must be at
proper clearance before tightening fan to shaft.
Refer to the following table and illustration.
Model Clearance
346/348 1/4 in.
408/410
AB200, AB250
August 1999
8.2-3 3
Nuts
CLEARANCE
1/8 in.