Desa FVFM27NR/PR - Manual (Page 17)

108382-01E
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INSPECTING BURNERS
Check pilot flame pattern and burner flame patterns often.
PILOT FLAME PATTERN
Figure 28 shows a correct pilot flame pattern. Figure 29 shows an
incorrect pilot flame pattern. The incorrect pilot flame is not
touching the thermocouple. When the thermocouple cools, the
heater will shut down.
If pilot flame pattern is incorrect, as shown in Figure 29
• turn heater off (see To Turn Off Gas to Appliance, page 15)
• see Troubleshooting, pages 19 through 21
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.
INSPECTING BURNERS
Pilot Flame Pattern
Burner Flame Pattern
Burner Primary Air Holes
Main Burner
CLEANING AND MAINTENANCE
Cleaning Burner Injector Holder And Pilot Air Inlet Hole
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.
BURNER FLAME PATTERN
Figure 30 shows a correct burner flame pattern. Figure 31 shows an
incorrect burner flame pattern.
If burner flame pattern is incorrect as shown in Figure 31
• turn heater off (see To Turn Off Gas to Appliance, page 15)
• see Troubleshooting, pages 19 through 21
Figure 30 - Correct Flame
Pattern Figure 31 - Incorrect Flame
Pattern
Figure 28 - Correct Pilot
Flame Pattern (Propane/LP
Pilot Shown)
Pilot Burner
Thermocouple
Pilot Burner
Thermocouple
Figure 29 - Incorrect Pilot Flame
Pattern (Propane/LP Pilot
Shown)
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 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, bedding material, pet hair, etc.
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 com-
pressed air in a can. You can use a vacuum cleaner in the blow
position. If using compressed air in a can, please follow the direc-
tions on the can. If you don't follow directions on the can, you could
damage the pilot assembly.
WARNING: Failure to keep the primary air
opening(s) of the burner(s) clean may result in soot-
ing and property damage.