cuiheat.com
126345-01D
20
INSPECTING BURNERS
Check pilot flame pattern and burner flame patterns often.
PILOT FLAME PATTERN
Figure 46 shows a correct pilot flame pattern. Figure 47 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 47
• turn heater off (see To Turn Off Gas to Appliance, Page 19)
• see Troubleshooting, Pages 22 to 24
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.
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.
WARNING: Turn off heater and let cool before
cleaning.
CAUTION: You must keep control areas, burners and
circulating 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 cleaning due to excessive
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 sooting
and property damage.
BURNER ORIFICE 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. 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. 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 Orifice holder
for dust and dirt (see Figures 48 and 49, Page 21).
3. Blow air through the ports/slots and holes in the burner.
4. Check the Orifice 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.
5. Blow air into the primary air holes on the Orifice holder.
6. In case any large clumps of dust have now been pushed into the
burner repeat steps 3 and 4.
CLEANING AND MAINTENANCE
Figure 46 - Correct Pilot Flame Pattern (Your pilot may vary from
pilot shown)
Pilot Burner
Thermocouple
Pilot Burner
Thermocouple
Figure 47 - Incorrect Pilot Flame Pattern (Your pilot may vary
from pilots shown)
