Inspecting Heater - Desa VN18B, VN18TB Manual De Instalación

Slightly press in control knob and turn coun-
terclockwise
positions (see Figure 22 or 23).
Control 16,000 &
Knob 18,000 Btu/Hr
Figure 22 - Burner Patterns for Manual
Controlled Models
Check pilot flame pattern and burner flame
pattern often.
PILOT FLAME PATTERN
Figure 24 shows a correct pilot flame pattern.
Figure 25 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 25
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 15)
• see Troubleshooting, page 18
Thermocouple
Figure 24 - Correct Pilot Flame Pattern
Thermocouple
Figure 25 - Incorrect Pilot Flame Pattern
16
OpERATION
to the LOW, MED or HI
26,000 &
30,000 Btu/Hr
LOW
MED
HI
OFF

INSpECTING HEATER

Blue Flame
Pilot
Burner
Yellow Flame
Pilot Burner
www.desatech.com
Continued
IMPORTANT: Release downward pressure
while turning control knob. Control knob will
lock at the desired position.
Control
Knob
Figure 23 - Burner Patterns for
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.
BURNER FLAME PATTERN
Figure 26 shows a correct burner flame pat-
tern. Figure 27 shows an incorrect burner
flame pattern.
If burner flame pattern is incorrect, as shown
in Figure 27
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 15)
• see Troubleshooting, page 18
Figure 26 - Correct Burner Flame Pattern
Figure 27 - Incorrect Burner Flame Pattern
16,000 &
18,000 Btu/Hr 30,000 Btu/Hr
Thermostat Models
26,000 &
121881-01B