Inspecting Burners; Cleaning And Maintenance; For More Information, Visit Www.desatech.com For More Information, Visit Www.desatech.com - Desa LSL3124N Owner's Operation And Installation Manual

INSPECTING BURNERS

18
Pilot Flame Pattern
Burner Primary Air Holes
Main Burner

CLEANING AND MAINTENANCE

Cleaning Burner Injector Holder and Pilot Air Inlet Hole
INSPECTING BURNERS
Check pilot flame pattern and burner flame patterns often.
PILOT FLAME PATTERN
Figure 27 shows a correct pilot flame pattern. Figure 28 shows an
incorrect pilot flame pattern. The incorrect 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 28
• turn heater off (see To Turn Off Gas to Appliance, page 16
[Manually-Controlled Models] or page 17 [Thermostatically-
Controlled Models])
• see Troubleshooting, pages 20 through 22
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.
Pilot Burner
Thermocouple
Figure 27 - Correct Pilot Flame
Pattern (Your pilot may vary
from pilots shown)
BURNER PRIMARY AIR HOLES
Air is drawn into the burner through the holes in the fitting at the
burner entrance. These holes may become blocked with dust or lint.
Periodically inspect these holes for any blockage and clean if
needed. 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.
For more information, visit www.desatech.com
For more information, visit www.desatech.com
Pilot Burner
Thermocouple
Figure 28 - Incorrect Pilot
Flame Pattern (Your pilot may
vary from pilots shown)
CLEANING AND
MAINTENANCE
WARNING: Turn off heater and let cool before
cleaning.
CAUTION: You must keep control areas, burners,
and circulating air passageways of heater clean. In-
spect these areas of heater before each use. Have
heater inspected yearly by a qualified service person.
Heater may need more frequent cleaning due to exces-
sive lint from carpeting, pet hair, bedding material, etc.
WARNING: Failure to keep the primary air
opening(s) of the burner(s) clean may result in soot-
ing and property damage.
CLEANING 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 inspected 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 compressed air no greater than 30 PSI. Your local computer 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 compressed 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. Remove control cover log and front log.
2. Shut off the unit, including the pilot. Allow the unit to cool for
at least thirty minutes.
3. Inspect burner, pilot, and primary air inlet holes on injector
holder for dust and dirt (see Figures 29 and 30, page 19).
4. Blow air through the ports/slots and holes in the burner.
5. Check the injector holder located at the end of the burner tube
again. Remove any large particles of dust, dirt, lint, or pet hair
with a soft cloth or vacuum cleaner nozzle.
6. Blow air into the primary air holes on the injector holder.
7. In case any large clumps of dust have now been pushed into
the burner repeat steps 3 and 4.
8. Replace front log and control cover log (see Installing Logs,
pages 13 and 14).
111347-01B