Lame Olor Ehavior; Eplacing Urner Rifices; A Djustment - Lennox Hearth Products Designer DBV Installation And Operation Manual

TO TURN OFF GAS TO APPLIANCE
1. Turn off the "ON/OFF" rocker switch and/or thermostat (if
installed) to its lowest setting.
2. Turn off electric power to the appliance if service is to
be performed.
3. Push in gas control knob slightly and turn clockwise
to "OFF." Do not force.
This appliance needs fresh air for safe operation and must
be installed so there are provisions for adequate combus-
tion and ventilation air.
WARNING: Improper installation, adjustment, alteration,
service, or maintenance can cause injury or property dam-
age. For assistance or additional information, consult a
qualified installer, service agency, or your gas supplier.
Operation of this appliance when not connected to a prop-
erly installed and maintained venting system can result in
carbon monoxide (CO) poisoning and possible death.
SHUTDOWN PROCEDURE
To turn off the burner, turn the rocker switch to "OFF" or
adjust the thermostat (if installed) to a setting below room
temperature. The pilot will remain lit for future burner igni-
tion. For complete shutdown, see "TO TURN OFF GAS TO
APPLIANCE" above.
Control Panel
OFF / PILOT / ON
Gas Control
Robertshaw Millivolt Gas Valve
Gas Control Knob
(Pilot / On / Off)
Piezo Igniter
ON/OFF Switch
Allumeur
Interrupteur
Figure 18
HI / LO
Flame Height Control
TH
TP
TP/TH
Flame Height Control
Knob (HI/LO)
Millivolt Pilot
Gas Pilot Hood
Thermopile Igniter
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Flame Color & Behavior
Your Designer™ gas insert is designed for maximum heat-
ing efficiency. Therefore, upon lighting of the main burner
the flames will be semi-transparent or "bluish." After 10-20
minutes of operation the logs will heat up and the flames
will become a yellow/orange color.
Adjusting the insert to cause the flames to turn orange sooner
may result in poor combustion, sooting, and a hazardous
situation. See the drawing to the right showing proper flame
appearance.
Burner Flame Appearance
Soot above
Soot at
Flame Tip
Flame Tip
Dark Orange
Flame
Ports on Pan
Burner Assembly
No Blue Flame
Center
IMPROPERLY
BURNING FLAME
Figure 19
r b o
eplaCing urner rifiCes
This insert has two separate burner tubes and therefore an
orifice for each. The front and rear orifices have different
thread types so that a front orifice cannot be installed in the
rear orifice location and visa-versa. Installing them in the
wrong location will destroy the orifice threads.
To change orifices, first remove the cassette (see Fuel Con-
version and Cassette Installation). Then remove the burner
retaining plate by removing the allen head screw C (see
Figure 9). This allows the front and rear burner tubes to be
removed providing access to the two orifices.
The rear orifice has 9/16-24 threads and can be removed by
unscrewing the 5/8 compression nut and then unscrewing
the 3/4" jam nut from the orifice. The front orifice is a 3/8"
NPT and can be unscrewed with a 3/4" wrench.
REDUCING THE ORIFICE SIZE FOR HIGHER ALTITUDES
MAINTAINS THE PROPER BTU INPUT TO AIR RATIO. TOO
LARGE AN ORIFICE WILL RESULT IN HIGHER BTU INPUTS
THAN THE DESIGN ALLOWS, MAY RESULT IN AN UNSAFE
CONDITION AND MAY VOID YOUR WARRANTY.
For altitudes above 2,000 ft. (610M) (In Canada 4,500
FT/1370 M) the appliance should be derated by four (4%)
percent every 1,000 ft. (305M).
To operate safely, your Designer™ gas insert must have
the proper burner orifice size determined by the altitude at
which it will be operated and other variables such as pres-
sure and valve tolerances. If you have reason to believe
your insert's orifice size may be incorrect for your altitude,
have it checked and remedied (if necessary) by a qualified
service technician.
No Soot at
Flame Tip
Semi-Transparent
Yellow Flame
Blue Flame
Center
PROPERLY
BURNING FLAME
15