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123995-01C 15
OPERATION
Continued
MANUAL CONTROL INFRARED
MODELS ONLY
TO SELECT
HEATING LEVEL
WARNING: When running
heater, set control knob at LOW
or HIGH locked positions for
double burner heater or ON po-
sition for single burner heater.
Never set control knob between
locked positions. Poor combus-
tion and higher levels of carbon
monoxide may result.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
Control Double
Knobs Burners
ON
OFF
PILOT
IGN
OFF
Control Single
Knob Burner
Figure 20 - Burner Patterns
INSPECTING BURNER
Thermocouple
Pilot Burner
Pilot Burner
Thermocouple
Figure 21 - Correct Pilot Flame Pattern
Figure 22 - Incorrect Pilot Flame Pattern
Slightly press in control knob and turn counter-
clockwise to the LOW or HIGH positions
for double burner heater or ON position for
single burner heater.
IMPORTANT: Release downward pressure
while turning control knob. Control knob will
lock at the desired position.
Check pilot ame pattern and burner ame
pattern often.
PILOT FLAME PATTERN
Figure 21 shows a correct pilot ame pattern.
Figure 22 shows an incorrect pilot ame pat-
tern. The incorrect pilot ame is not touching
the thermocouple. This will cause the thermo-
couple to cool. When the thermocouple cools,
the heater will shut down.
If pilot ame pattern is incorrect, as shown
in Figure 22
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 14)
• see Cleaning, page 17
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.