Air Proving Switch; Igniter And Flame Sensor Assembly - L.B. White Premier 80 Owner's Manual And Instructions

FIG. 23
MOTOR MOUNT PLATE
MOTOR
Premier 80 3/16 IN/4.7 mm
Premier 170 1/8 IN./3.2 mm

Air Proving Switch

The air proving switch is located on the fan housing at
the motor end of the heater. It must work properly to
allow an ignition cycle. If the air proving switch contacts
are closed before the ignition control starts the fan mo-
tor, or do not close on a call for heat after the fan motor
starts, ignition will not occur . See Fig. 24.
To service:
-- Remove the two (2) sheet metal screws holding the
switch with bracket to blower housing.
-- 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. 24
Premier Ductable Heaters
FAN WHEEL
CLEARANCE
Owner's Manual • Premier 80-170
Igniter and Flame
Sensor Assembly
The igniter is of local sense design, meaning it
also serves to sense burner fl ame.
1. See Fig. 25 or 26, depending on heater
model, for location of igniter/sensor as-
sembly.
2. Remove the two screws securing the
mounting bracket to the burner. Remove
igniter assembly.
3. Disconnect high voltage cable from igniter
assembly.
4. Remove the two screws that secure the
igniter sensor to the mounting bracket.
• The igniter and ground rod should be
cleaned to maintain proper ignition.
-- Use steel wool or emery cloth.
-- Rub briskly to remove buildup of dust,
dirt, and oxide.
• Check the igniter's ceramic base for cracks.
-- Replace the igniter if cracks are found.
FIG. 25
Same specifi cations for all versions -
Premier 170 shown
FRONT VIEW
1/2 IN. DISTANCE FROM IGNITER
TOP TO BURNER TIP
IGNITER/SENSOR MOUNTING SCREWS
HIGH VOLTAGE IGNITION LEAD
TOP VIEW
ELECTRODE GAP IS 1/8" &
CENTERED OVER BURNER PORT
25
MOUNTING BRACKET
IGNITER BRACKET
MOUNTING SCREWS
BURNER PORT