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33ISDG Vent Free Gas Fireplace System
Flames from the pilot, front and rear burner should be visually checked as soon as the
heater is installed. In addition, periodically check the flames visually during operation.
CHECk THE PILOT FLAME
The pilot flame must always be present when the heater is in operation. It should just touch
the top of the thermocouple tip for natural. Refer to Figure 25 for correct pilot flame.
If the pilot flame does not touch the thermocouple, then the main burner cannot function reliably.
Refer to Figure 26 for incorrect shape of pilot flame.
THERMOSTAT AND MILLI-VOLT CONTROL
Thermocouple
for Natural
Thermocouple
for LP
Figure 25 -
Correct Appearance of Pilot Flame
In normal operation at full rate after 15 minutes, the follow-
ing flame appearances should be observed:
Burner will have a random pattern of yellow flames as
shown in Figure 28. There should be glowing embers on
the front burner. NOTE: The front flames and embers will
be an opaque orange color during the burn off time.
20
FP2272
FP2272
pilot correct flame
Figure 27 -
Correct Burner Flame Appearance
Thermocouple
for Natural
Thermocouple
for LP
Figure 26 -
Incorrect Appearance of Pilot Flame
Glowing
Embers
LG936
ISD log flames
FLAME APPEARANCE
FP2273
FP2273
pilot bad flame
LG936
23D8036
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