www.fmiproducts.com
117437-01F
23
INSPECTING BURNERS
Thermocouple
Thermopile
1/4"
Pilot Burner
Piezo
Ignitor
Figure 34 - Pilot Assembly
(Millivolt Ignition System)
3/8" to 1/2"
Sensor
Rod
Pilot
Burner
Piezo
Ignitor
Figure 35 - Pilot Assembly
Electronic Ignition System)
Check pilot flame pattern and burner flame
patterns often.
PILOT ASSEMBLY
The pilot assembly is factory preset for
proper flame height. Alterations may have
occurred during shipping and handling. Call
a qualified service person to readjust the pilot
if necessary.
The position and pattern of pilot flames in rela
-
tion to sensing devices should be as shown
in Figures 34 and 35 respectively.
Pilot flame may need adjustment in order
for thermocouple, thermopile and/or ignition
system to sense pilot flame.
If your pilot assembly does not meet these
requirements:
• turn fireplace off (see
To Turn Off Gas to
Appliance
, page 20 or 21)
• see sections under
Troubleshooting
,
page 25
Figure 36 - Typical Flame Pattern
Figure 37 - Adjusting Air Setting
AIR ADJUSTMENT SETTING
The main burner air shutter opening is factory
set to the following:
Natural Gas - 1/8", Propane/LP Gas - 3/4"
Air shutter may require adjustment depending
on altitude, venting condition, burner opera
-
tion and general flame appearance.
If flames are lifting or sooting shutter may
require opening. If flames are too blue or im
-
properly lighting shutter may require closing.
See Figure 37 for proper air adjustment.
IMPORTANT:
Do not reduce air shutter open
-
ing any lower than designed minimum stop
setting of 1/8".
1/8" Minimum
Air Opening
Air
Shutter
Burner
Tube
Adjustment
Screw
BURNER FLAME PATTERNS
Burner flames will be steady, not lifting or
floating. Flame patterns will differ from unit
to unit and will vary depending on installation
type and weather conditions.
If vent configuration is installed incorrectly,
flames will lift or “ghost”. This can be danger
-
ous. Inspect flames after installation to ensure
proper installation and performance. Figure 40
shows a typical flame pattern.
If burner flame pattern differs from that de
-
scribed:
• turn fireplace off (see
To Turn Off Gas to
Appliance
, page 20 or 21)
• see
Troubleshooting
, page 26