32
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
WARNING
•
Air shutter adjustment should
only be performed by a
qualified professional service
technician.
•
Ensure front glass panel are
in place and sealed during
adjustment.
CAUTION
•
Soot will be produced if the
air shutter is closed too much.
Any damage due to sooting,
resulting from improperly
setting the air shutter, is not
covered under the warranty.
•
The air shutter door and
nearby appliance surfaces
are hot. Exercise caution to
avoid injury while adjusting
flame appearance.
1
. Refer to
Figures 57, 58, and 59
for proper
flame appearance. To adjust the flame, rotate
the adjustment rod toward the back or toward
the front of the fireplace (rod located in the
lower control area). Position the air shutter
to the factory setting as shown in the table
in
Figure 60
.
2.
Light appliance (follow lighting procedure
on lighting label in control compartment or
in the
Care and Operation Instructions
).
3.
Allow the burner to operate for at least 15
minutes while observing the flame continu-
ously to ensure that the proper flame ap-
pearance has been achieved
.
If the following
conditions are present, adjust accordingly.
• If flame appears weak or sooty, adjust
the air shutter, incrementally, to a more
open position until the proper flame
appearance is achieved.
• If flame remains blue, adjust the air
shutter, incrementally, to a more closed
position until the proper flame appear-
ance is achieved.
4.
When satisfied that the burner flame appear-
ance is normal, reinstall the lower control
compartment door, then proceed to finish
the installation.
Figure 57 -
MPd33 MOdEL
Figure 58 -
MPd35 MOdEL
Figure 59 -
MPd40 ANd MPd45 MOdEL
