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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT
®
SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • CARE AND OPERATION INSTRUCTIONS
Appliance Installation, Service,
and Maintenance Notices
IMPORTANT: Improper installation,
adjustment, alteration, service, or main-
tenance can cause injury or property
damage. Refer to this manual. For assist-
ance or additional information, consult a
qualified installer, service agency or the
gas supplier.
Only trim kit(s) supplied by the manufac-
turer shall be used in the installation of
this appliance.
Draft relief openings must not be covered
or blocked.
These appliances must not be connected
to a chimney or flue serving a separate
solid fuel burning appliance.
Any change to this appliance and/or its
operating controls is dangerous. Improper
installation or use of this appliance can
cause serious injury or death from fire,
burns, explosion or carbon monoxide
poisoning.
Carbon Monoxide Poisoning: Early signs
of carbon monoxide poisoning are simi-
lar to the flu with headaches, dizziness
and/or nausea. If you have these signs,
obtain fresh air immediately. Turn off the
gas supply to the appliance and have it
serviced by a qualified professional, as
it may not be operating correctly. Some
people are more affected by carbon
monoxide than others, including pregnant
women, people with heart or lung disease
or anemia, those under the influence of
alcohol, and those at high altitudes.
Turn off gas and electrical power to the
fireplace and allow it to cool before clean-
ing or servicing the appliance.
Warranty Information
Your gas appliance is covered by a limited
twenty-year warranty. You will find a copy
of the warranty accompanying this manual.
Please read the warranty to be familiar with
its coverage.
Retain this manual. File it with your other docu-
ments for future reference.
Failure to comply with the installation and
operating instructions provided will result
in an improperly installed and operating
appliance, voiding its warranty.
Do not attempt to alter or modify the
construction of the appliance or its com-
ponents. Any modification or alteration
may void the warranty, certification, and
listings of this unit.
Appliance Operation Notices
Do not operate appliance with the glass
front removed, cracked, or broken.
These fireplaces are vented gas appli-
ances. Do not burn wood or other material
in these appliances.
These fireplaces are designed as supple-
mental heaters. Therefore, it is advisable to
have an alternate primary heat source when
installed in a dwelling.
This appliance is only for use with the
type of gas indicated on rating plate. This
appliance is not convertible for use with
other gases, unless a certified kit is used.
These appliances are designed to oper-
ate on natural gas or propane gas only.
The use of other fuels or combinations of
fuels will degrade the performance of this
system and may be dangerous.
Provide adequate clearances around
air openings and adequate accessibility
clearance for service and proper opera-
tion. Never obstruct the front openings of
the appliance.
Do not use this appliance if any part has
been under water. Immediately call a
qualified service technician to inspect the
appliance and to replace any part of the
control system and any gas control that
has been under water.
The vent termination is hot while in opera-
tion and for a period of time following the
use of the fireplace. To prevent contact
with hot surfaces, we recommend the use
of a termination guard. See Page 20 for
ordering information.