L.B. White 400 Tradesman Portable Forced Air - Manual (Page 15)

MAINTENANCE
1. Using a small wire brush, reach down the barrel of
the heater and brush the igniter electrode. Ensure
buildup is removed.
2. Test the igniter. With the gas supply shut off, turn
the heater on. If there is not a spark, or a weak
spark is evident, either check the gap of the igniter
electrode or replace the igniter. Gap should be 3/16
in. See Fig.12. If a spark jumps between the
electrodes, the igniter is functioning properly.
. FIG. 12
REPLACEMENT
1. Disconnect the igniton cable from the igniter. See
Fig.13.
2. Remove the igniter mounting screw and nut. See
Figs. 13 and 14.
FIG. 13
FIG. 14
1. Loosen the compression nut at the burner orifice.
Remove the bowed retaining clip. See Fig. 15.
FIG. 15
2. Reach down the barrel of the heater and pull the
orifice from the burner plate.
3. Inspect the orifice and clean any plugged holes.
Replace it if necessary. The replacement orifice will
include retaining clips.
4. Ensure the orifice is installed so the arrow on its face
is directed upward. See Fig.16. This ensures proper
alignment of smaller orifice hole to the igniter for sure
ignition. See Fig.17.
FIG. 16
FIG. 17
IGNITER
14
BURNER ORIFICE
IGNITER
CABLE
NUT
COMPRESSION NUT
BOWED
RETAINING
CLIP
SCREW
3/16 in.
SMALLER HOLE ALIGNED TO
IGNITER GAP