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 position for single burner heater. Never set control knob between locked positions. Poor combustion and higher levels of carbon monoxide may result.
CAUTION: Do not try to adjust heating levels by using the equipment shutoff valve.
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.
Control | Double | Control | Single |
Knobs | Burners | Knob | Burner |
|
| OFF |
|
|
| PILOT |
|
|
| IGN |
|
|
| ON |
|
|
| OFF |
|
Figure 20 - Burner Patterns
Inspecting Burner
Check pilot flame pattern and burner flame pattern 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 shut down.
If pilot flame 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 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
Figure 21 - Correct Pilot Flame Pattern
Pilot Burner
Thermocouple
Figure 22 - Incorrect Pilot Flame Pattern
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