Burner Orifice; Motor And Fan - L.B. White SENTINEL AT 150 Owner's Manual And Instructions

1. Remove the igniter
2. Remove the clear flexible tube from the pressure
switch. Fig.24.
. 3. Remove the four nuts from the burner mounting studs
and remove burner . See Fig.24.
FIG. 24
TUBE
NUTS
4 Securely hold the burner manifold in place while
removing the orifice from the manifold. See Fig. 25.
Inspect the orifice and clean out any dirt. Replace it if
necessary.
1. Remove all fan housing mounting nuts. See Fig. 27.
2. Tilt the motor and fan assembly slightly and pull
upward.
FIG. 27
NUTS
FIG. 25
ORIFICE
5. When reinstalling the burner, ensure larger opening
between burner vanes is directed to the access door
of the burner box. See Fig.26
FIG. 26
.
LARGER OPENING
MOTOR AND FAN ASSEMBLY
3. Remove inlet side of housing. See Fig. 28. Loosen
set screw on fan hub with a TORX 20 driver.
4. Pull fan wheel from housing. Remove nuts holding
housing to motor mounting studs.
FIG. 28

BURNER ORIFICE

MANIFOLD
19