Log Placement; Glowing Embers Placement; Appliance Checkout; Wiring Diagram - Lennox Hearth Products MDT3328CNM Care And Operation Instructions Manual

33" direct-vent gas fireplace heaters
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Log Placement

WARNING: LOGS GET VERY HOT AND
WILL REMAIN HOT UP TO ONE HOUR
AFTER GAS SUPPLY IS TURNED OFF.
HANDLE ONLY WHEN LOGS ARE COOL.
TURN OFF ALL ELECTRICITY TO THE
APPLIANCE BEFORE YOU INSTALL
GRATE AND LOGS.
WARNING: THIS APPLIANCE IS NOT
MEANT TO BURN WOOD. ANY ATTEMPT
TO DO SO COULD CAUSE IRREPARABLE
DAMAGE TO YOUR APPLIANCE AND
PROVE HAZARDOUS TO YOUR SAFETY.
WARNING: THE SIZE AND POSITION ON
THE LOG SET WAS ENGINEERED TO GIVE
YOUR APPLIANCE A SAFE, RELIABLE
AND ATTRACTIVE FLAME PATTERN. ANY
ATTEMPT TO USE A DIFFERENT LOG SET
IN THE FIREPLACE WILL VOID THE WAR-
RANTY AND WILL RESULT IN INCOM-
PLETE COMBUSTION, SOOTING, AND
POOR FLAME QUALITY.
Carefully position the ceramic fiber logs and
twigs over the burner according to the follow-
ing steps while referring to Figure 5.
1. Set the rear log on the raised bracket at the
rear of the firebox, fitting the slot in the log over
the vertical bracket tab.
2. Position the front log with the pins for the
two side twigs in the up position, and the two
vertical burner tabs recessed into the two
notches at rear of the log. Check for recessing
of brackets into log notches (by touch) to verify
correct log placement.
3. Insert the alignment hole of the left twig over
the front log's left pin. Rotate the left twig until it
just touches the edge of the ember bed bracket.
4. Insert the alignment hole of the right twig
over the front log's right pin. Rotate the right
twig until it almost touches front panel glass.
Proper twig placement is critical to prevent soot-
ing. Twigs should be placed in the gaps between
the flame peaks and should be positioned so that
at no time they impinge the flames.
Glowing Ember Placement
Remove the replacement rockwool (Glowing
Embers) from the packaging and tear into nickel
size pieces (Figure 6 ) .
Figure 5
Spread rockwool (nickel-sized pieces) on and
along the length of the burner screen. Do not
use more than is necessary. To many nickel-
sized pieces on the front burner section will
cause poor combustion.
When properly positioned, the rockwool will
unevenly cover approximately 85% of the burner
screen with no appreciable gaps or openings.

Appliance Checkout

The pilot flame should be steady, not lifting or
floating. Flame should be blue in color with
traces of orange at the outer edge.
The top ³⁄₈" (10 mm) at the pilot generator
(thermopile) and the top ¹⁄₈" min (tip) of the
quick drop out thermocouple should be en-
gulfed in the pilot flame. The flame should
project 1" (25 mm) beyond the hood at all three
ports (Figure 7) .
Figure 6
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
With proper care and maintenance, your appli-
ance will provide many years of enjoyment. If you
should experience any problem, first refer to the
trouble shooting guide in this manual. If problem
persists, contact your Lennox distributor.
MILLIVOLT
Hood
Ignitor Rod
Thermocouple
Pilot
Nozzels
Figure 7

WIRING DIAGRAM

The wiring diagrams are provided here for
reference purposes only (Figures 8 and 9 on
page 8) . This information is also provided on
schematics found on pullout lighting instruc-
tion labels located within the control compart-
ment attached to the gas control valve.
CAUTION: LABEL ALL WIRES PRIOR TO
DISCONNECTION WHEN SERVICING CON-
TROLS. WIRING ERRORS CAN CAUSE IM-
PROPER AND DANGEROUS APPLIANCE OP-
ERATION.
³⁄₈" Min
(9 mm)
Thermopile
7

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