Motor And Fan Wheel Assembly; Sail Switch And Sail (Flapper) - L.B. White AW250 Owner's Manual And Instructions

1. Remove the screws securing the motor mounting
plate to the fan housing.
2. Pull the fan and motor assembly from the housing.
3. Loosen the set screw(s) on the fan wheel with a
wrench.
4. Pull the fan wheel from the motor shaft. Use a wheel
puller if necessary.
5. Remove the four (4) nuts securing the motor to the
mounting plate.
NOTES: a. Fan wheel to motor mount plate spacing must
be adjusted to 3.2 mm clearance before
tightening the fan wheel to the motor shaft.
b. Make sure that set screw(s) of the fan are on
the "flats" of motor shaft when tightening.
1. Make sure there is not any dust, dirt, etc. that will
cause binding on the pivot points of the sail as it rides
within the blower housing. If debris is found, use a
soft brush or compressed air to clean the area as
necessary.
2. The "arm" of the sail should engage the arm of the
sail switch when the trailing edge of the sail body is
lifted and is approximately 31.7 mm to 34.9 mm off
the blower housing bottom. At this distance you will
hear a click which are the contacts closing within the
switch mechanism.
3. If the switch contacts do not close within this
distance, then manually push in the arm in the switch
to make sure the switch is not defective. If a click is
heard, the switch is good and the sail arm then needs
to be adjusted to engage the switch arm.
4. Using a needle nose pliers, gently bend up the arm of
the sail (NOT THE SWITCH ARM) in increments until
the sail arm engages the switch arm, closing the
contacts of the switch when the sail body trailing
edge is 31.7 mm to 34.9 mm from the housing
bottom.

MOTOR AND FAN WHEEL ASSEMBLY

FIG. 8
MOTOR MOUNT PLATE
MOTOR

SAIL SWITCH AND SAIL (FLAPPER)

FIG. 9
BLOWER OUTLET
OF HEATER
AIR PROVING
SWITCH
ARM OF
FLAPPER
AIR PROVING
SWITCH ARM
FAN WHEEL
CLEARANCE
FAN WHEEL
PIVOT POINT
OF FLAPPER
PIVOT POINT
EDGE OF
OF FLAPPER
FLAPPER
FLAPPER
31.7 MM TO 34.9 MM
14