Desa VSL18NT - Manual (Page 16)

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Figure 24 - Correct Burner Flame Pattern
Yellow
Tipping
Figure 25 - Incorrect Burner Flame
Pattern
1 /
2
Deflector
Height
Blue
Flame
1 /
2
Deflector
Height
Note: The thermostat sensing bulb measures
the temperature of air near the heater cabinet.
This may not always agree with room tem-
perature (depending on housing construction,
installation location, room size, open air tem-
peratures, etc.). Frequent use of your heater will
let you determine your own comfort levels.
MANUAL LIGHTING
PROCEDURE
1. Remove front panel (see Figure 6, page 9).
2. Follow steps 1 through 7 under Lighting
Instructions, page 15.
3. With control knob pressed in, strike match.
Hold match to pilot until pilot lights.
4. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob. Now follow step 9, under
Lighting Instructions , page 15.
5. Replace front panel.
INSPECTING HEATER
Check pilot flame pattern and burner flame pat-
tern often.
PILOT FLAME PATTERN
Figure 22 shows a correct pilot flame pattern.
Figure 23 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 23
• turn heater off (see To Turn Off Gas to Appliance,
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.
Figure 24 - Incorrect Pilot Flame Pattern
Figure 23 - Correct Pilot Flame Pattern
Thermocouple
Pilot
Burner
Thermocouple
Blue Flame
Yellow Flame
Pilot
Burner
OPERATING HEATER
Continued
BURNER FLAME PATTERN
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles enter the
heater and burn causing brief
patches of orange flame.
Figure 24 shows a correct burner flame pattern.
Figure 25 shows an incorrect burner flame pattern.
The incorrect burner flame pattern shows yellow
tipping of the flame. It also shows the flame higher
than 1/2 the deflector panel height.
If burner flame pattern is incorrect, as shown in
Figure 25
• turn heater off (see To Turn Off Gas To Appli-
ance , page 15)
• see Troubleshooting, page 18