L.B. White Guardian with Smart Sense - Spark Ignition (60K / 100K) - Manual (Page 17)

16
AIR PROVING SWITCH WITH PADDLE
The air proving switch must work properly to allow an
ignition cycle. If the air proving switch contacts do
not close on a call for heat after the fan motor starts,
ignition will not occur.
1. Remove the two (2) sheet metal screws holding
the switch with bracket to blower housing. See Fig.
13.
2. Remove the assembly by turning the switch so the
paddle on the switch arm can be pulled through
the oblong hole on side of fan housing.
FIG. 13
SIGNAL CONDITIONER
If replacing the signal conditioner:
■
Handle the replacment conditioner at its edges.
■
Don’t touch the signal conditioner components,
otherwise damage may occur.
■
Snug in the conditioner’s mounting screws to
prevent board damage. Do not overtighten.
FIG. 16
SENSOR IGNITER
4 MM
HEAT CHAMBER FA
BURNER
IGNITER / SENSOR
ENCLOSURE
SOR WITH ENCLOSURE
IFT ASSEMBLY
TING SLOTS
GNITER LOOSEN SCREW.
CLOSURE UP OR DOWN
W PROPER POSITIONING
NITER TO BURNER.
IGNITER AND FLAME SENSOR
IGNITER
FLAME SENSOR
REMOVE SCREW (65,9 kW MODEL ONLY)
REMOVE SCREWS
IGNITER/SENSOR
ENCLOSURE
HEAT CHAMBER
LOOSEN SCREWS, SLIDE IGNITER
UP/DOWN TO MAINTAIN PROPER
GAP. REMOVE SCREWS AS NEEDED
FOR SERVICING IGNITER ASSEMBLY
BURNER
BURNER
IGNITER / SENSOR
ENCLOSURE
HEAT CHAMBER
IGNITER
3/16 in.
IGNITER ENCLOSURE
IGNITER
HEAT CHAMBER
FLAME SENSOR
3/16 in.
SENSOR
■
Refer to Fig. 14 (AD100) or Fig. 15 (AD060) for
servicing of the igniter assembly.
■
The igniter/sensor assembly may require cleaning due
to accumulations of dust and dirt over a period of
time, affecting its ability to ignite fuel gas and sense
burner flame. Cleaning will require igniter/sensor
removal.
-- If spark appears to be weak, rub the igniter
electrode with emery cloth or steel wool to remove
any buildup.
--- If the spark appears strong but the heater cycles
off, rub the sensor rod with emery cloth or steel
wool to remove any build-up. Ensure proper
ground.
■
Ensure the igniter gap is 3/16 in. and the igniter tip is
positioned over the burner port according to the
illustration below.
FIG. 15
FIG. 14
BURNER
LOOSEN SCREW AND SLIDE
IGNITER ENCLOSURE UP OR
DOWN TO MAINTAIN PROPER
GAP. FOR SERVICING,
REMOVE THE SCREW AND
LIFT THE ENCLOSURE FROM
THE MOUNTING SLOTS IN
HEAT CHAMBER.