Desa CB36N - Manual (Page 23)

www.desatech.com 117437-01D 3
INSPECTING BURNERS
Thermocouple
Thermopile
1/4"
Pilot.Burner
Piezo
Ignitor
Figure 38 - Pilot Assembly
(Millivolt Ignition System)
3/8".to.1/"
Sensor.
Rod
Pilot.
Burner
Piezo
Ignitor
Figure 39 - 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.38.and.39.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.5
Figure 40 - Typical Flame Pattern
Figure 41 - 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 41 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 25