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OpERATING HEATER
Continued
Slightly press in control knob and turn counter-
clockwise
to the LOW, MED or HI posi-
tions (see Figure 22 or 23).
IMPORTANT: Release downward pressure while
turning control knob. Control knob will lock at the
desired position.
Control
16,000 &
Knob
18,000 Btu/Hr
Figure 22 - Burner Patterns for Manual
Controlled Models
Control
16,000 &
Knob
18,000 Btu/Hr
Figure 23 - Burner Patterns for
Thermostat Models
INSpECTING HEATER
Check pilot flame pattern and burner flame pat-
tern often.
PILOT FLAME PATTERN
Figure 24 shows a correct pilot flame pattern.
Figure 25 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 25
16
26,000 &
30,000 Btu/Hr
LOW
MED
HI
OFF
26,000 &
30,000 Btu/Hr
www.desatech.com
• turn heater off (see To Turn Off Gas to Appli-
ance, page 15)
• see Troubleshooting, page 18
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.
Thermocouple
Figure 24 - Correct Pilot Flame Pattern
Thermocouple
Figure 25 - Incorrect Pilot Flame Pattern
BURNER FLAME PATTERN
Figure 26 shows a correct burner flame pattern. Fig-
ure 27 shows an incorrect burner flame pattern.
If burner flame pattern is incorrect, as shown in
Figure 27
• turn heater off (see To Turn Off Gas to Appli-
ance, page 15)
• see Troubleshooting, page 18
Figure 26 - Correct Burner Flame Pattern
Figure 27 - Incorrect Burner Flame
Blue Flame
Pilot Burner
Yellow Flame
Pilot Burner
Pattern
113052-01F
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