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24
INSPECTING BURNERS
Check pilot flame pattern and burner flame pat-
terns often.
PILOT FLAME PATTERN
Figure 39 shows a correct pilot flame pattern. Figure
40 shows an incorrect pilot flame pattern. The incor-
rect pilot flame is not touching the thermocouple.
This will cause the thermocouple to cool. When the
thermocouple cools, the heater will shut down.
If pilot flame pattern is incorrect, as shown in
Figure 40
• turn heater off (see To Turn Off Gas to Appli-
ance, page 21 [manually-controlled models] or
page 23 [thermostat-controlled models])
• see Troubleshooting, pages 26 through 28
Note:
The pilot flame on natural gas units will
have a slight curve, but flame should be blue and
have no yellow or orange color.
Figure 39 - Correct Pilot Flame Pattern
Figure 40 - Incorrect Pilot Flame Pattern
Thermocouple
Pilot Burner
Thermocouple
Pilot Burner
BURNER PRIMARY AIR HOLES
Air is drawn into the burner through the holes in the
fitting at the entrance to the burner. These holes may
become blocked with dust, lint, or pet hair. Periodi-
cally inspect these holes for any blockage and clean
as necessary. Blocked air holes will create soot.
MAIN BURNER
Periodically inspect all burner flame holes with the
heater running. All slotted burner flame holes should
be open with yellow flame present. All round burner
flame holes should be open with a small blue flame
present. Some burner flame holes may become
blocked by debris or rust, with no flame present. If
so, turn off heater and let cool. Remove blockage.
Blocked burner flame holes will create soot.
CLEANING AND
MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep
control areas, burner, and cir-
culating air passageways of
heater clean. Inspect these ar-
eas of heater before each use.
Have heater inspected yearly by
a qualified service person.
Heater may need more frequent
cleaning due to excessive lint
from carpeting, bedding mate-
rial, pet hair, etc.
WARNING: Failure to keep
the primary air opening(s) of the
burner(s) clean may result in
sooting and property damage.
BURNER INJECTOR HOLDER AND
PILOT AIR INLET HOLE
The primary air inlet holes allow the proper amount
of air to mix with the gas. This provides a clean
burning flame. Keep these holes clear of dust, dirt,
lint, and pet hair. Clean these air inlet holes prior to
each heating season. Blocked air holes will create
soot. We recommend that you clean the unit every
three months during operation and have heater in-
spected yearly by a qualified service person.
We also recommend that you keep the burner tube
and pilot assembly clean and free of dust and dirt.
To clean these parts we recommend using com-
pressed air no greater than 30 PSI. Your local com-
puter store, hardware store, or home center may
carry compressed air in a can. You can use a
vacuum cleaner in the blow position. If using com-
pressed air in a can, please follow the directions
on the can. If you don't follow directions on the
can, you could damage the pilot assembly.
1. Shut off the unit, including the pilot. Allow
the unit to cool for at least thirty minutes.
2. Inspect burner, pilot, and primary air inlet
holes on injector holder for dust and dirt (see
Figure 41, page 25).