Pilot Orifice; Thermocouple - L.B. White Sun Blast CR125AZPA220206 Manuel De L'utilisateur

A plugged orifice creates a poor pilot flame, leading to
pilot outages. The pilot flame should impinge on the
thermocouple tip as shown in Fig. 10.
If the pilot flame appears weak, the pilot orifice may
require cleaning or replacement. Refer to the following
instructions.
1. Remove the screws from the side panel at the lower
section of the burner. See Fig.11.
FIG. 10
PILOT FLAME
FIG. 12
NATURAL GAS PROPANE GAS
The thermocouple may need replacement if the burner
goes out after allowing the thermocouple to heat up for an
extended period of time. Normal time for thermocouple
warm-up is 30 seconds to 1 minute
■
To determine if the thermocouple is defective:
-- Connect tip switch leads together with a
jumper.
-- Connect an ohm meter between the
thermocouple tip and its contact button
(previously connected to safety control)
-- A good thermocuple will give some level of
resisitance from end to end.
-- A defective thermocouple will show an
overload or infinite resistance on the ohm
meter.
1. If replacing, remove the side panel from lower
section of the burner. See Fig. 11 above.
2. Remove the thermcouple from the pilot bracket. See
Fig. 13.
3. Loosen the opposite end of the thermouple at the
safety control valve.
3/8 in. (9.5 mm) to
1/2 in. (12.7 mm)

THERMOCOUPLE

2. Loosen the pilot tube's compression fitting at the
pilot orifice. See Fig.11.
3. Remove the pilot orifice from the pilot bracket. See
Fig. 11.
4. Hold the orifice up to light and verify if both pilot
holes are open. If plugged, use only air to clean the
orifice. Replace if necessar y. See Fig. 12 for
comparison of propane and natural gas orifices and
hole location.
FIG. 11

PILOT ORIFICE

PILOT TUBE
■
When reinstalling, ensure the thermocouple's
attachment nut is completely threaded into the pilot
bracket. This ensures proper thermocouple position
relative to pilot flame. Failure to do so may cause pilot
outage.
■
When connecting the thermocouple to the safety
control valve, thread the thermocouple finger tight to
the valve, then snug it in with a wrench.
FIG. 13
PILOT ORIFICE
THERMOCOUPLE
THERMOCOUPLE
13