L.B. White HW120 Plus Therma Grow - Manual (Page 19)

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1. Remove the sensor from its mounting bracket. Clean
the sensor’s rod with emery cloth or steel wool to
buildup of dirt to help maintain proper flame sense.
See Fig. 17.
2. Check the flame sensor’s insulative base for any
cracks. If cracks are found, replace the sensor.
FIG. 16
■
For proper flame sense operation, the flame sensor tip
must be properly positioned within the burner flame.
See Fig. 17.
FIG. 17
FLAME SENSOR
IGNITER
1. Disconnect the plastic male and female plugs located
at the end of the igniter leads. See Fig. 16
2. Loosen the screw securing the igniter shield and the
igniter to the mounting bracket. Remove the igniter
and shield.
3. Ensure the igniter is located so the its lip on back side
of igniter is resting on the edge of the mounting
bracket and the mounting hole in the igniter aligns
with the mounting hole in the bracket.
4. Slide the igniter shield over the igniter so hole in
shield aligns with hole in igniter and bracket.
■
Handle the igniter by its ceramic base, or by its leads.
■
Center the igniter shield over the igniter element,
making sure the shield does not touch the igniter
element, otherwise igniter damage will occur when the
igniter is energized..
■
D o n ot ove r t i g h te n t h e i g n i te r m o u n t i n g s c r ew.
Over tightening may crack the base of the igniter,
leading to premature failure.
IGNITER
SHIELD
SCREW
WASHER
MALE CONNECTOR
FEMALE CONNECTOR
SCREW
BRACKET
BURNER
SENSOR
BURNER
FLAME
BURNER
CASTING
FLAME SENSOR
3/8 TO 1/2 IN. 1/2 in. to 3/4 in.