Inspecting Burners - Desa VUL18NV Owner's Operation & Installation Manual

TO TURN OFF GAS
TO APPLIANCE
1. Press in and turn control knob clockwise
to the HI position.
2. Turn the control knob clockwise
the PILOT position.
3. Press in control knob and turn clockwise
to the OFF position.
4. Close equipment shutoff valve (see
Figure 15), page 15.
Check pilot flame pattern and burner flame
patterns often.
PILOT FLAME PATTERN
Figure 25 shows a correct pilot flame pattern.
Figure 26 shows an incorrect pilot flame pat-
tern. The incorrect pilot flame is not touching
the thermocouple. This will cause the thermo-
couple to cool. When the thermocouple cools,
the heater will shut down.
If pilot flame pattern is incorrect, as shown
in Figure 26
• turn heater off (see To Turn Off Gas to
Appliance
• see Troubleshooting, page 21
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 25 - Correct Pilot Flame Pattern
Thermocouple
Figure 26 - Incorrect Pilot Flame Pattern
FRONT BURNER FLAME PATTERN
Figure 27 shows correct front burner flame
pattern. Figure 28 shows incorrect front burner
flame pattern. The incorrect burner flame pat-
tern shows yellow tipping at top of blue flame.
119677-01G
OPERATION

INSPECTING bURNERS

Pilot Burner
Thermocouple
Pilot Burner
Thermocouple
www.desatech.com
Continued
MANUAL LIGHTING
1. Follow steps 1 through 5 under Lighting
Instructions, page 18.
2. Press control knob and light pilot with
to
match.
3. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob. Now follow step 8
under Lighting Instructions, page 18.
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide. If front burner flame
pattern shows yellow tipping,
follow instructions at bottom of
this page. Yellow flame on rear
burner is normal.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles are burned
by heater, causing brief patches
of orange flame.
If front burner flame pattern is incorrect, as
shown in Figure 28
• turn heater off (see To Turn Off Gas to
Appliance)
• see Troubleshooting, page 21
Figure 27 - Correct Front Burner Flame
Yellow Tipping
At Top of Blue
Flame
Figure 28 - Incorrect Front Burner Flame
PROCEDURE
Pattern
Pattern
19