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113097-01E 23
INSPECTING BURNERS
Check pilot ame pattern and burner ame pat-
terns often.
pILOT FLAME pATTERN
Figure 34 shows a correct pilot ame pattern. Figure
35 shows an incorrect pilot ame pattern. The incor-
rect pilot ame is not touching the thermocouple.
This will cause the thermocouple to cool. When the
thermocouple cools, the heater will shut down.
If pilot ame pattern is incorrect, as shown in
Figure 35
• turn heater off (see To Turn Off Gas to Appli-
ance, page 20 [manually-controlled models] or
page 22 [thermostat-controlled models])
• see Troubleshooting, page 25
Note: The pilot ame on natural gas units will
have a slight curve, but ame 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
tting 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 ame holes with the
heater running. All slotted burner ame holes should
be open with yellow ame present. All round burner
ame holes should be open with a small blue ame
present. Some burner ame holes may become
blocked by debris or rust, with no ame present. If
so, turn off heater and let cool. Remove blockage.
Blocked burner ame holes will create soot.
Figure 34 - Correct Pilot Flame Pattern
Figure 35 - Incorrect Pilot Flame Pattern
Thermocouple
Pilot Burner
Thermocouple
Pilot Burner
CLEANING AND
MAINTENANCE
WARNING: Turn off heater
-
-
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 ame. 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 qualied 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 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.