2
LENNOX HEARTH PRODUCTS • MERIT
®
SERIES B-VENT GAS FIREPLACES • MODELS MLBV-35, MLBV-40 • INSTALLATION INSTRUCTIONS
Packaging .........................................Page 2
Introduction ......................................Page 2
General Information ..........................Page 2
Gas Pressure Requirements ..............Page 4
Orifice Sizes ......................................Page 4
Gas Valve Diagrams ..........................Page 4
Requirements for the Commonwealth
of Massachusetts .......................Page 4
New York City Approval .....................Page 4
Cold Climate Insulation .....................Page 5
Location ............................................Page 5
Vent Termination Clearances:
Multiple Terminations.....................Page 6
Gas Vent Rule ................................Page 6
Minimum Clearances to Combustibles:
Appliance and Vent Clearances ......Page 7
Hearth Extension ............................Page 7
Wall Finishes / Surrounds /
Mantels .......................................Page 7
Pre-Installation Steps (Remove
Glass Enclosure Panel) ...............Page 8
Typical Installation Sequence ............Page 8
Detailed Installation Steps:
Step 1. Construct Appliance
Framing ............................Page 8
Fireplace and Framing
Specifications ...................Page 9
Step 2. Route the Gas Line ..............Page 11
Step 3. Install Venting System and
Exterior Termination .........Page 11
Step 4. Install Field Wiring ..............Page 12
Wiring Diagrams .................Page 13
Step 5. [Optional] Install Outside
Combustion Air Kit ............Page 14
Installation Accessories ......Page 14
Step 6. Connect the Gas Line ..........Page 15
Step 7. Verify Appliance
Operation .........................Page 16
Step 8. Install Volcanic Stone, Glowing
Embers, and Logs ...........Page 17
MLBV-35 Log Placement ....Page 18
MLBV-40 Log Placement ....Page 19
Step 9. Install the Glass Enslosure
Panel ...............................Page 20
Step 10. Burner Air Shutter
Adjustments .....................Page 20
Step 11. Perform Spillage Test ..........Page 22
Manually-Reset Safety Limit
Switch ..............................Page 22
Step 12. Install Hood .........................Page 23
Step 13. Finishing Requirements ......Page 23
Step 14. Attach Safety-in-Operation
Warnings
......................................
Page 24
Gas Conversion Kits
.........................
Page 25
PACKAGING
The assembled vented gas fireplace is packaged
with the following items:
1 - One log set located in firebox area.
2 - One envelope containing the literature
package which consists of the care and
operations manual, installation instruc-
tions, safety-in-operation warning labels
and warranty; envelope is located in the
control compartment.
3 - One hood located behind the glass enclo-
sure panel assembly.
4 - One bag of decorative volcanic stone located
in the lower control compartment.
5 - One bag of glowing embers located in the
lower control compartment.
INTROdUCTION
The Millivolt appliances have a millivolt gas
control valve with piezo ignition system.
The Electronic appliances have a battery
backed-up electronic intermittent pilot ignition
system. No external electrical power is required
to operate these appliances; however, 120V
AC is recommended (see Step 4, “Install Field
Wiring,” on Page 12).
Use Only These Approved Vent Components:
These vented gas fireplaces are designed for
residential applications. They must be installed
with approved Type-B double-wall vent pipe
systems and a listed vent termination routed
to the outside atmosphere. Use only the proper
size listed below.
• 4" B-Vent for 35" models and 5" B-Vent for
40" models.
GENERAL INfORMATION
Children and adults should be alerted to
the hazards of high surface temperature
and should stay away to avoid burns or
clothing ignition.
Les enfants et les adultes devraient
être infor-més des dangers que posent
les températures de surface élevées
et se tenir à distance afin d’éviter des
brûlures ou que leurs vêtements ne
s’enflamment.
dO NOT ATTEMPT TO ALTER OR
MOdIfY THE CONSTRUCTION Of THE
APPLIANCE OR ITS COMPONENTS. ANY
MOdIfICATION OR ALTERATION MAY
VOId THE WARRANTY, CERTIfICATION,
ANd LISTINGS Of THIS UNIT.
WARNING
Young children should be care-
fully supervised when they are
in the same room as the appli-
ance. Toddlers, young children
and others may be susceptible
to accidental contact burns.
A physical barrier is recom-
mended if there are at risk
individuals in the house. To
restrict access to a fireplace
or stove, install an adjustable
safety gate to keep toddlers,
young children and other at
risk individuals out of the room
and away from hot surfaces.
AVERTISSEMENT
Les jeunes enfants devraient être
surveillés étroitement lorsqu’ils
se trouvent dans la même pièce
que l’appareil. Les tout petits,
les jeunes enfants ou les adultes
peuvent subir des brûlures s’ils
viennent en contact avec la sur-
face chaude. Il est recommandé
d’installer une barrière physique
si des personnes à risques habi-
tent la maison. Pour empêcher
l’accès à un foyer ou à un poêle,
installez une barrière de sécu-
rité; cette mesure empêchera les
tout petits, les jeunes enfants et
toute autre personne à risque
d’avoir accès à la pièce et aux
surfaces chaudes.
WARNING
B-Vent appliances are
not designed to operate
in negatively pressured
environments (pressure within
the home is less than pressures
outside). Significant negatively
pressured environments caused
by weather, home design, or
other devices may impact the
operation of these appliances.
Negative pressures may result
in poor flame appearance,
sooting, damage to property
and/or severe personal
injury. do not operate these
appliances in negatively
pressured environments.
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