Desa VN600BA - Manual (Page 15)

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OPERATING HEATER
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.
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
Knobs Burners
ON
OFF
PILOT
IGN
OFF
Control Single
Knob Burner
Figure 20 - Burner Patterns
INSPECTING BURNER
Check pilot flame pattern and burner flame pat-
tern often.
PILOT FLAME PATTERN
Figure 21 shows a correct pilot flame pattern.
Figure 22 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 22
• turn heater off (see To Turn Off Gas to Appli-
ance, page 14)
• 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
Pilot Burner
Pilot Burner
Thermocouple
Figure 21 - Correct Pilot Flame Pattern
Figure 22 - Incorrect Pilot Flame Pattern