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OPERAtING HEAtER
Continued
MANUAL LIGHTING
pROCEDURE
1. Follow steps 1 through 5 under Lighting
Instructions, page 16.
2. Depress control knob and light pilot
with match.
3. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob. Now follow step 8 under
Lighting Instructions, page 16.
INSPEctING bURNERS
Check pilot flame pattern and burner flame pat-
terns often.
pILOT FLAME pATTERN
Figure 21 shows a correct pilot flame pattern.
Figure 22 shows an incorrect pilot flame pat-
tern. The incorrect pilot flame is not touching the
thermocouple. This will cause the thermocouple to
cool. When the thermocouple cools, the heater will
f i r e - p a r t s . c o m
shut down.
If pilot flame pattern is incorrect, as shown in
Figure 22
• turn heater off (see To Turn Off Gas to Appli-
ance, page 17)
• see Troubleshooting, page 20
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
Propane/LP
Figure 21 - Correct Pilot Flame Pattern
Pilot Burner
Thermocouple
Propane/LP
Figure 22 - Incorrect Pilot Flame Pattern
18
BURNER PRIMARY AIR HOLES
Air is drawn into the burner through the holes in
the fitting at the entrance to the burner. These holes
may become blocked with dust or lint. Periodically
inspect these holes for any blockage and clean as
necessary. 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.
Pilot Burner
Natural Gas
ODS/PILOT AND BURNER
Use a vacuum cleaner or small, soft bristled brush
to clean.
Pilot Burner
Natural Gas
www.desatech.com
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 quali-
fied service person. Heater may
need more frequent cleaning due
to excessive lint from carpeting,
bedding material, pet hair, etc.
WARNING: Failure to keep
the primary air opening(s) of
the burner(s) clean may result in
sooting and property damage.
119347-01A
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