33
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
qualifi ed 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
fl ame appearance.
1. Refer to Figures 57, 58, and 59 for
proper fl ame appearance. To adjust
the fl ame, rotate the adjustment rod
toward the back or toward the front of
the fi replace (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 fl ame
continuously to ensure that the proper
fl ame appearance has been achieved.
If the following conditions are present,
adjust accordingly.
• If fl ame appears weak or sooty, adjust
the air shutter, incrementally, to a
more open position until the proper
fl ame appearance is achieved.
• If fl ame remains blue, adjust the air
shutter, incrementally, to a more
closed position until the proper fl ame
appearance is achieved.
4. When satisfi ed that the burner fl ame
appearance is normal, reinstall the
lower control compartment door, then
proceed to fi nish the installation.
Figure 57: MPD33 MODEL
Figure 58: MPD35 MODEL
Figure 59: MPD40 AND MPD45 MODEL
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