2
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
B-VENT GAS FIREPLACES (MPB33/35/40/45) • INSTALLATION INSTRUCTIONS
PACKAGING
The assembled vented gas fireplace is pack-
aged with:
•
(1 set) Logs (packaged in a carton inside
the firebox).
•
(1 bag) Volcanic Stone (included in the
firebox or bottom compartment).
•
(1 bag) Glowing Embers (in bottom compart-
ment).
•
Literature Kit (envelope in bottom com-
partment containing Care and Operation
Instructions, Installation Instructions,
Safety-In-Operation Warning Labels, War-
ranty).
•
(1) Hood (behind the top louver assembly).
INTRODUCTION
The
Millivolt
appliances have a millivolt gas
control valve with piezo ignition system. If any
optional accessories that will require electrical
power are to be installed, the electrical power
must be provided at the time of appliance in-
stallation.
The
Electronic
appliances are designed to op-
erate on natural or propane gas. An electronic
intermittent pilot ignition system provides safe,
efficient operation. External electrical power is
required to operate these units. In the event of a
power outage, four (4) "AA" batteries (in battery
holder) provide backup power for appliance
operation (excluding [optional] blower).
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.
REqUIRED PIPE DIAMETER:
MPB33 series:
Requires 4" (102 mm)
MPB35 series:
Requires 5" (127 mm)
MPB40 series:
Requires 5" (127 mm)
MPB45 series:
Requires 6" (152 mm)
WARNING
B-Vent appliances are not
designed to operate in negatively
pressured environments (pres-
sure within the home is less than
pressures outside). Significant
negatively pressured environ-
ments caused by weather, home
design, or other devices may
impact the operation of these
appliances. Negative pres-
sures may result in poor flame
appearance, sooting, damage to
property and/or severe personal
injury. Do not operate these
appliances in negatively pres-
sured environments.
TABLE OF CONTENTS
Packaging .................................................... 2
Introduction ................................................. 2
General Information ..................................... 2
Requirements for the
Commonwealth of Massachusetts ............ 4
Cold Climate Insulation ................................ 4
Manufactured Housing ................................. 4
Location ........................................................5
Vent Termination Clearances ....................... 5
Appliance and Vent Clearances .................... 6
Pre-Installation Steps ................................... 7
Typical Installation Sequence ...................... 7
Detailed Installation Steps ............................ 7
Step 1. Framing ............................................ 7
Framing Specifications ................................ 8
Fireplace Specifications .............................. 9
Step 2. Routing Gas Line ............................. 9
Step 3. Installing Vent System ................... 10
Step 4. Field Wiring ................................... 11
Step 5. Wiring Optional
Forced Air Blower Kit .................... 12
Step 6. Connecting Gas Line ..................... 12
Step 7. Installing Optional Outside Air Kit ..13
Step 8. Verifying Appliance Operation ........... 14
Step 9. Installing Volcanic Stone, Glowing
Embers, and Logs ........................ 14
Step 10. Removing and
Installing the Glass Door ............. 19
Step 11. Burner Adjustments ..................... 19
Step 12. Testing Vent Operation ..................21
Step 13. Hood Installation .......................... 21
Step 14. Finishing Requirements ............... 21
Step 15. Attaching Safety-in-Operation
Warnings ............................ 22
Gas Conversion Kits ......................... 23
Please read and understand these
instructions before beginning your
installation.
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 recommended
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.
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
informés 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.
