Desa CF26PRA - Manual (Page 23)

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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 incorrect pilot flame is not properly heating
the thermocouple. 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)
• see Troubleshooting, page 25
Note:
The correct 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
(propane/LP ignitor shown)
Figure 40 - Incorrect Pilot Flame Pattern
(propane/LP ignitor shown)
Pilot Burner
Thermocouple
Pilot Burner
Thermocouple
BURNER FLAME PATTERN
Figure 41 shows a correct burner flame pattern.
Figure 42 shows an incorrect burner flame pattern.
If burner flame pattern is incorrect,
• turn heater off (see To Turn Off Gas to Appli-
ance, page 21)
• see Troubleshooting, page 25
Figure 41 - Correct Flame Pattern with
Control Knob Set to High Flame
Figure 42 - Incorrect Flame Pattern with
Control Knob Set to High Flame
Approx. 3-6"
Above Top
of Logs
More Than
8" Above
Top of Logs
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.
CLEANING AND
MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep
control areas, burner and circu-
lating air passageways of heater
clean. Inspect these areas of
heater before each use. Have
heater inspected yearly by a
qualified service person. Heater
may need more frequent clean-
ing due to excessive lint from
carpeting, bedding material, pet
hair, etc.