Pilot Light Assembly - L.B. White Classic 346 Owner's Manual And Instructions

Classic Agricultural Animal Confinement Building Heaters
FIG. 34
THERMOCOUPLE CONNECTED TO
GAS CONTROL
Testing the thermocouple:
-- Obtain a volt /ohm meter and set the meter to the
continuity scale.
-- Place the probes at both ends of the thermocouple.
-- The meter should exhibit readings of approximately 1
ohm or less. A reading showing high resistance or an
overload condition indicates a defective thermocouple.

Pilot Light Assembly

1. Remove the pilot shield, exposing the pilot bracket,
pilot orifi ce, and thermocouple. See Fig. 35, Classic
115 shown.
FIG. 35
PILOT ORIFICE
PILOT TUBE
FITTING
2. Using a soft brush or compressed air, clean the pilot of
dust and dirt, paying attention to the the fl ame spreader
at the top of the stack.
3. Blow off the top of the pilot orifi ce to clean out as much
dirt as possible.
4. Servicing the pilot orifi ce:
-- Remove the pilot tube from the inlet of the pilot
orifi ce See Fig. 35.
-- Remove the pilot orifi ce from the pilot bracket.
-- Hold the orifi ce up to the light to see if the holes
in the orifi ce are open. If not, clean with air or
replace.
-- See Fig. 36 for comparison. Ensure the proper
pilot orifi ce is installed for the fuel being used.
(Note the number stamped on the fl at of the orifi ce
hex to identify if LP or NG.)
FIG. 36
LP
4712
5. When lit after cleaning, the pilot fl ame should impinge
on the upper half of the thermocouple. The fl ame
should not be wavy, noisy, or lazy. See Fig. 37.
FIG. 37
PILOT FLAME
SPREADER
HEAD
Classic 115:
Ensure the pilot gasket is located as shown in Fig. 38,
and is not torn. A missing or damaged gasket will cause
a pilot outage to occur when the blower motor is operat-
ing. Ensure the gasket is properly positioned on the
burner before after servicing the pilot or at reassembly
of the pilot assembly.
Owner's Manual • Classic
23
NG
6721
TOP HALF OF
THERMOCOUPLE
THERMOCOUPLE