Desa Tech CGN20TA - Manual (Page 13)

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OWNER’S MANUAL
OPERATING
HEATER
Continued
THERMOSTAT CONTROL
OPERATION
The thermostatic control used on these
models differs from standard thermo-
stats. Standard thermostats simply turn
on and off the burner. The thermostat
used on this heater senses the room tem-
perature. The thermostat adjusts the
amount of gas flow to the burner. This
increases or decreases the burner flame
height. At times the room may exceed the
set temperature. If so, the burner will
shut off. The burner will cycle back on
when room temperature drops below the
set temperature. The control knob can be
set to any heat level between HI and LO.
Note: The thermostat sensing bulb mea-
sures the temperature of air near the
heater cabinet. This may not always agree
with room temperature (depending on
housing construction, installation loca-
tion, room size, open air temperatures,
etc.). Frequent use of your heater will let
you determine your own comfort levels.
MANUAL LIGHTING
PROCEDURE
1. Remove front panel (see Figure 7,
page 8).
2. Follow steps 1 through 5 under Light-
ing Instructions, page 12.
3. With control knob pressed in, strike
match. Hold match to pilot until pi-
lot lights.
4. Keep control knob pressed in for 30
seconds after lighting pilot. After 30
seconds, release control knob.
5. Replace front panel.
INSPECTING
BURNER
Check pilot flame pattern and burner flame
pattern often.
PILOT FLAME PATTERN
Figure 18 shows a correct pilot flame pat-
tern. Figure 19 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.
Thermocouple
Pilot Burner
Figure 18 - Correct Pilot Flame Pattern
Pilot Burner
Thermocouple
Figure 19 - Incorrect Pilot Flame Pattern
If pilot flame pattern is incorrect, as shown
in Figure 19.
• turn heater off (see To Turn Off Gas to
Appliance, page 12).
• see Troubleshooting, pages 14 through 16.
1/2
INCORRECT FLAME PATTERN
AT HIGH POSITION
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 20 - Correct Burner Flame Pattern
Figure 21 - Incorrect Burner Flame Pattern
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide. If burner flame pat-
tern shows yellow tipping, follow
instructions at bottom of this
page.
CORRECT FLAME PATTERN
AT HIGH POSITION
1/2 G
Yellow Tipping
BURNER FLAME PATTERN
Figure 20 shows a correct burner flame
pattern. Figure 21 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
glass panel height.
If burner flame pattern is incorrect, as shown
in Figure 21
• turn heater off (see To Turn Off Gas to
Appliance, page 12)
• see Troubleshooting, pages 14 through 16
1 /
2
Glass
Height
1 /
2
Glass
Height
Correct Flame Pattern
At High Position
Incorrect Flame Pattern
At High Position