Lennox Hearth MPB3530CNM-B User Manual
INSTALLATION INSTRUCTIONS
MPB B-Vent
Gas Fireplaces
P/N 506015-05 Rev. NC 07/2012
This manual is one of a set of two supporting this product.
Refer to P/N 506017-04 for Care and Operation Instructions.
Ce manuel est disponible en francais, simplement
en faire la demande. Numéro de la pièce 506223-45.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
INSTALLATEUR : Laissez cette notice avec l’appareil.
CONSOMMATEUR : Conservez cette notice pour
consultation ultérieure.
WARNING
/
AVERTISSEMENT
MODELS
MPB33CNM
MPB33CPM
MPB35CNM
OTL Report No. 116-F-36d-5
Please read and understand these instructions
MILLIVOLT: ELECTRONIC:
MPB35CPM
MPB40CNM
MPB45CNM
Portland
US
before starting installation.
MPB33CNE
MPB35CNE
/
AVISO
MPB40CNE
MPB45CNE
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WARNING: If the information in these instructions
is not followed exactly, a fire or explosion may
result, causing property damage, personal injury,
or death.
$ONOTSTOREORUSEGASOLINEOROTHERFLAMMABLE
vapors and liquids in the vicinity of this or any other
appliance.
7(!44/$/)&9/53-%,,'!3
s$ONOTTry to light any appliance.
s$ONOTTOUCHANYELECTRICALSWITCHDONOTUSEANY
phone in your building.
s)MMEDIATELYCALLYOURGASSUPPLIERFROMA
neighbor’SPHONE&OLLOWTHEGASSUPPLIER’s
instructions.
s)FYOUCANNOTREACHYOURGASSUPPLIERCALLTHEFIRE
department.
- Installation and service must be performed by a
qualified installer, service agency or the gas supplier.
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AVERTISSEMENT : Assurez-vous de bien suivre les
instructions données dans cette notice pour réduire au
minimum le risque d’incindie ou d’explosion ou pour
éviter tout dommage matériel, toute blessure ou la mort.
- Ne pas entreposer ni utilizer d’essence ni d’autres vapeurs
ou liquides inflammables dans le voisinage de cet appareil
ou de tout autre appareil.
15%&!)2%3)6/533%.4%:5.%/$%52$%'!:
s.EPASTENTERDALLUMERDAPPAREIL
s.ETOUCHEZÜAUCANINTERRUPTEUr. Ne pas vous servir des
téléphones se trouvant dans le bâtiment où vous trouvez.
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un voisin. Suivez les instructions du fournisseur.
s3IVOUSNEPOUVEZREJOINDRELEFOURNISSEURDEGAZ
appelez le service des incindies.
- ,’installation et l’entretien doivent être assurés par un
installateur ou un service d’entretien qualifié ou par le
fournisseur de gaz.
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LENNOX HEARTH PRODUCTS • MERIT PLUS® B-VENT GAS FIREPLACES (MPB33/35/40/45) • INSTALLATION INSTRUCTIONS
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 Specifi cations ................................ 8
Fireplace Specifi cations .............................. 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
PACKAGING
The assembled vented gas fi replace is
packaged with:
• (1 set) Logs (packaged in a carton inside
the fi rebox).
• (1 bag) Volcanic Stone (included in the
fi rebox or bottom compartment).
• (1 bag) Glowing Embers (in bottom
compartment).
• Literature Kit (envelope in bottom compartment containing Care and Operation
Instructions, Installation Instructions,
Safety-In-Operation Warning Labels,
Warranty).
• (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 installation.
The Electronic appliances are designed
to operate on natural or propane gas. An
electronic intermittent pilot ignition system
provides safe, effi cient 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 fi replaces 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 in. (102 mm)
MPB35 series: Requires 5 in. (127 mm)
MPB40 series: Requires 5 in. (127 mm)
MPB45 series: Requires 6 in. (152 mm)
GENERAL INFORMATION
WARNING
Young children should be carefully supervised when they are
in the same room as the appliance. 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 fi replace 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 surface chaude. Il est recommandé
d’installer une barrière physique
si des personnes à risques habitent la maison. Pour empêcher
l’accès à un foyer ou à un poêle,
installez une barrière de sécurité; 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). Signifi cant
negatively pressured environments caused by weather, home
design, or other devices may
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 afi n d’éviter des
brûlures ou que leurs vêtements ne
s’enfl amment.
impact the operation of these
appliances. Negative pressures may result in poor fl ame
appearance, sooting, damage to
property and/or severe personal
injury. Do not operate these
appliances in negatively pres-
2
sured environments.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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.
LENNOX HEARTH PRODUCTS • MERIT PLUS® B-VENT GAS FIREPLACES (MPB33/35/40/45) • INSTALLATION INSTRUCTIONS
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause injury
or property damage. Refer to
this manual. For assistance or
additional information consult
a qualified installer, service
agency or the gas supplier.
WARNING
Failure to comply with these installation instructions will result
in an improperly installed and
operating appliance, voiding its
warranty. Any change to this appliance and/or its operating controls
is dangerous.
WARNING
Clothing or other flammable
material should not be placed
on or near the appliance.
AVERTISSEMENT
On ne devrait pas placer de
vêtements ni d’autres matières
infl ammables sur l’appareil ni à
proximité.
WARNING
Any safety screen or guard removed for servicing the appliance must be replaced prior to
operating the appliance.
AVERTISSEMENT
Tout écran ou protecteur retiré
pour permettre l’entretien de
l’appareil doit être remis en
place avant de mettre l’appareil
en marche.
WARNING
Improper installation or use of
this appliance can cause serious
injury or death from fi re, burns,
explosion or carbon monoxide
poisoning.
WARNING
Failure to position the parts in
accordance with these diagrams
or failure to use only parts
specifi cally approved with this
appliance may result in property
damage or personal injury.
AVERTISSEMENT
Risque de dommages ou de
blessures si les pièces ne sont
pas installées conformément à
ces schémas et ou si des pièces
autres que celles spécifi quement
approuvées avec cet appareil sont
utilisées.
Note: Installation and repair should be
done by a qualifi ed service person. The
appliance should be inspected before use
and at least annually by a professional
service person. More frequent cleaning
may be required due to excessive lint from
carpeting, bedding material, etcetera. It
is imperative that control compartments,
burners and circulating air passageways of
the appliance be kept clean.
Remarque: L’installation et la
réparation devrait être confi ées à un
technicien qualifi é. L’appareil devrait
faire l’objet d’une inspection par un
technicien professionnel avant d’être
utilisé et au moins une fois l’an par la
suite. Des nettoyages plus fréquents
peuvent être nécessaires si les tapis,
la literie, et cetera produisent une
quantité importante de pous-sière. Il
est essentiel que les compartiments
abritant les commandes, les brûleurs
et les conduits de circulation d’air de
l’appareil soient tenus propres.
Do not use these appliances if any part
has been under water. Immediately
call a qualifi ed, professional service
technician to inspect the appliance
and to replace any parts of the control
system and any gas control which have
been under water.
Ne pas utiliser cet appareil s’il a été
plongé, même partiellement, dans
l’eau. Appeler un technicien qualifi é
pour inspecter l’appareil et remplacer
toute partie du système de commande
et toute commande qui a été plongée
dans l’eau.
Only trim kit(s) supplied by the
manufacturer shall be used in the
installation of this appliance.
Seules les trousses de garniture
fournies par le fabricant doivent être
utilisées pour l’installation de cet
appareil.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
These appliances comply with National
Safety Standards and are tested and listed
by OMNI-Test Laboratories, Inc. (Report
No. 116-F-36d-5) to ANSI Z21.50b-2009 (in
Canada, CSA 2.22b-2009), and CAN/CGA-
2.17-M91 (R2009) in both USA and Canada,
as vented gas fi replaces.
Both millivolt and electronic versions of
these appliances may be used in bedrooms
only when the room is an "uncon ned
space" as de ned by the National Fuel Gas
Code. Use in bedrooms may not be allowed
by your local building codes. You should
obtain prior approval from the Authority
having jurisdiction prior to installation.
MISC. CODES / STANDARDS
The Installation must conform to local codes or,
in the absence of local codes, with the National
Fuel Gas Code, ANSI Z223.1 / NFPA 54—latest
edition (In Canada, the current CAN/CGA-B149.1
installation code).The appliance, when installed,
must be electrically grounded and wired in
accordance with local codes or, in the absence
of local codes, with the National Electrical Code,
ANSI/NFPA 70—latest edition, or the Canadian
Electrical Code, CSA C22.1—latest edition.
Provide adequate clearances around air
openings and adequate accessibility clearance
for service and proper operation. Never obstruct
the front or back openings of the appliance.
These appliances are designed to operate
on natural or propane gas only. The use
of other fuels or combination of fuels will
degrade the performance of this system and
may be dangerous.
These replaces are designed as decorative
appliances and are not intended for use as
area heaters. They must not be equipped
with wall thermostats or remote controls
with thermostat functions.
OUTSIDE COMBUSTION AIR HOOK UP
These appliances are equipped with an
integral combustion air door and actuator arm.
Combustion air kits are optional. Install as
shown in Step 7 on Page 13.
These appliances must not be connected to a
chimney or fl ue serving a separate solid fuel
burning appliance.
Both millivolt and electronic systems can be
operated during a power outage, and feature
manually operated hi-low fl ame control. The
BTU Input for these appliances is shown in
Table 1.
Natural Gas Propane Gas
Model Input Rate
MPB33 13,500 to
MPB35 16,000 to
MPB40 24,000 to
MPB45 24,750 to
Table 1: BTU Input Ratings
(BTU/HR)
17,500
20,000
30,000
31,000
Input Rate
BTU/HR)
13,500 to
17,500
16,500 to
20,000
22,300 to
28,000
23,000 to
29,000
3
LENNOX HEARTH PRODUCTS • MERIT PLUS® B-VENT GAS FIREPLACES (MPB33/35/40/45) • INSTALLATION INSTRUCTIONS
it
GAS PRESSURE—ALL MODELS
Tables 2 and 3 show the appliances' inlet and
manifold gas pressure requirements:
Fuel # Minimum Maximum
Natural Gas
Propane
4.5 in. WC
(1.12 kPa)
11.0 in. WC
(2.74 kPa)
10.5 in. WC
(2.61 kPa)
13.0 in. WC
(3.23 kPa)
Table 2: Inlet Gas Supply Pressure
Fuel # Low High
Natural Gas
Propane
1.6 in. WC
(0.40 kPa)
6.3 in. WC
(1.57 kPa)
3.5 in. WC
(0.87 kPa)
10.0 in. WC
(2.49 kPa)
Table 3: Manifold Gas Supply Pressure
Test gauge connections are provided on
the front of the millivolt and electronic gas
control valve (identifi ed IN for the inlet and
OUT for the manifold side). The control
valves have a 3/8 in. (10 mm) NPT thread
inlet and outlet side of the valve (refer to
Figures 1 and 2).
Propane tanks are at pressures that will
cause damage to valve components. Verify
that the tanks have step down regulators to
reduce the pressure to safe levels.
The appliance and its appliance main gas
valve must be disconnected from the gas
supply piping system during any pressure
testing of that system at test pressures in
excess of 1/2 psi (3.5 kPa).
The appliance must be isolated from
the gas supply piping system by closing
its equipment shutoff valve during any
pressure testing of the gas supply piping
system at test pressures equal to or less
than 1/2 psi (3.5 kPa).
ORIFICE SIZES—SEA LEVEL TO HIGH
ALTITUDE (ALL MODELS)
These appliances are tested and approved
for installation at elevations of 0–4500 ft
(0–1372 m) above sea level using the
standard burner orifi ce sizes (marked with an
"*" in Table 4). For elevations above 4500 ft,
contact your gas supplier or qualifi ed service
technician.
Deration—At higher elevations, the amount
of BTU fuel value delivered must be reduced
by either:
• Using gas that has been derated by the
gas company.
• Changing the burner orifi ce to a smaller
size as regulated by the local authorities
having jurisdiction and by the (USA)
National Fuel Gas Code NFPA 54—latest
edition / ANSI Z223.1 or, in Canada, the
CAN/CGA-B149.1 codes—latest edition.
4
Install the appliance according to the
regulations of the local authorities having
jurisdiction and, in the USA, the National Fuel
Gas Code NFPA 54—latest edition / ANSI
Z223.1 or, in Canada, the CAN/CGA-B149.1—
latest edition.
Flame breadth, height and width will diminish
4% for every 1,000 feet of altitude. Gas Valve
Diagrams
. See Figure 1 for millivolt models
and Figure 2 For electronic models.
In Canada - CAN/CGA-2.17-M91 (R2009)
(high altitude): THE CONVERSION SHALL
BE CARRIED OUT BY A MANUFACTURER’S
AUTHORIZED REPRESENTATIVE, IN
ACCORDANCE WITH THE REQUIREMENTS
OF THE MANUFACTURER, PROVINCIAL
OR TERRITORIAL AUTHORITIES HAVING
JURISDICTION AND IN ACCORDANCE
WITH THE REQUIREMENTS OF THE
CAN/CGA-B149.1 OR CAN/CGA-B149.2
INSTALLATION CODES.
REQUIREMENTS FOR THE
COMMONWEALTH OF MASSACHUSETTS
These fi replaces are approved for installation
in the US state of Massachusetts if the
following additional requirements are met:
• Install this appliance in accordance with
Massachusetts Rules and Regulations
248 C.M.R.
Main Gas Control Knob
OFF/PILOT/ON
N
O
T
O
L
I
P
O
F
F
OUT
IN
Manifold Pressure Tap
Inlet Pressure Tap
Figure 1: SIT Millivolt Gas Valve
(from DFC Wire Harness)
Inlet (IN) Test Port
Manifold (OUT) Test Port
Orange Wire
(from DFC Wire
Harness)
Main Gas Inlet
3/8 in. NPT
Figure 2: SIT Electronic Gas Valve
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Pilot Adjustment
I
P
W
O
L
H
I
HI/LO Variable
Flame Height
Adjustment
Green Wire
Screw
T
O
L
H
TPT
HT
P
T
Model
Series
MPB33
MPB35
MPB40
MPB45
* Standard size installed at factory
• Part /Cat. Number
Nat.Gas
drill size (inches)
#47 (.0785") *
99K74 •
#44 (.086") *
60J80 •
#38 (.102") *
99K76 •
#36 (.104") *
24M10 •
Propane
drill size (inches)
(.048")*
99K78 •
#55 (.052") *
19L52 •
(.0625") *
21L01 •
#52 (.0635") *
37G00 •
Table 4: Burner Orifi ce Sizes
Elevation 0-4500 feet
(0-1372 meters)
• Installation and repair must be done by
a plumber or gas fi tter licensed in the
Commonwealth of Massachusetts.
• The fl exible gas line connector used shall
not exceed 36 in. (92 cm) in length.
• The individual manual shut-off must be a
T-handle type valve.
COLD CLIMATE INSULATION
For cold climate installations, seal all cracks
around your appliance with noncombustible
material and wherever cold air could enter the
room. It is especially important to insulate
outside chase cavity between studs and
under fl oor on which appliance rests, if fl oor
is above ground level. Gas line holes and
other openings should be caulked or stuffed
with unfaced fi berglass insulation.
If the fi replace is being installed on a
cement slab in cold climates, a sheet of
plywood or other raised platform can be
placed underneath to prevent conduction
of cold transferring to the fi replace and into
the room. It also helps to sheetrock inside
surfaces and tape for maximum air tightness
and caulk fi restops.
MANUFACTURED HOUSING
B-Vent Fireplaces are not approved for use in
OEM or aftermarket manufactured housing
built to HUD standards.
Hi/Lo Flame
Control Knob
Yellow Ground Wire
(from DFC Wire Harness)
LENNOX HEARTH PRODUCTS • MERIT PLUS® B-VENT GAS FIREPLACES (MPB33/35/40/45) • INSTALLATION INSTRUCTIONS
LOCATION
In selecting the location, the aesthetic and
functional use of the appliance are primary
concerns. However, vent system routing to
the exterior and access to the fuel supply are
also important.
Due to high temperatures, the appliance
should be located out of traffi c and away
from furniture and draperies (Figure 3).
En raison des températures élevées,
l’appareil devrait être installé dans un
endroit où il y a peu de circulation et loin
du mobilier et des tentures (Figure 3).
The location should also be free of electrical,
plumbing or other heating/air conditioning
ducting.
Be aware that this is a heat producing
appliance. Objects placed above the unit
are exposed to elevated temperatures.
Do not insulate the space between the
appliance and the area above it (see
Figure 9 on Page 8).
The appliance must be mounted on a
fully supported base extending the full
width and depth of the unit. The appliance
may be located on or near conventional
construction materials. However, if installed
on combustible materials, such as carpeting,
vinyl tile or other combustible material other
than wood fl ooring, the appliance shall be
installed on a metal or wood panel extending
the full width and depth of the appliance.
Vertical
Venting
Shown with Outside Air Kit
installed (model FOAK-4 or
FOAK-4LD)
When the unit is installed with one side flush with a
wall, the wall on the other side of the unit must not
extend beyond the front edge of the unit.
Figure 3: Typical Installations
Offset
Venting
VENT TERMINATION CLEARANCES
Gas Vent Rule - Gas vent caps are not
permitted within 8 feet (2.4 mm) of a vertical
wall or similar obstruction. Gas vent caps
that are located 8' or more from a portion of
a building which extends at an angle greater
than 45° upward from the horizontal may
terminate in accordance with Figure 4,
provided that in no case shall any discharge
opening on the cap be less than 2' (610 mm)
horizontally from the roof surface (National
Fuel Gas Code ANSI Z223.1 (NFPA 54) Gas
Vent Termination) (CAN/CGA B149.1).
MULTIPLE TERMINATIONS
These appliances may vent adjacent to and at
the same level with any other gas appliances
(including direct-vent appliances) provided
that there is at least 2 ft. (0.6m) between
the proximal edges of the vent caps. These
appliances may be vented adjacent to a
chimney vent servicing a solid fuel fi replace
provided the B-vent cap is at least 2 ft.
(0.6m) away from the nearest point of the
chimney opening.
X
12
Roof Pitch is X/12
Minimum Height from Roof to
Lowest Discharge Opening
1“ (25 mm)
Minimum
Termination Heights For Vents
Above Flat Or Sloped Roofs
Ref. NFPA 54 / ANSI Z223.1
Roof Pitch Feet Meters
Flat to 6/12 1.0 0.3
6/12 to 7/12 1.25 0.38
7/12 to 8/12 1.5 0.46
8/12 to 9/12 2.0 0.61
9/12 to 10/12 2.5 0.76
10/12 to 11/12 3.25 0.99
11/12 to 12/12 4.0 1.22
12/12 to 14/12 5.0 1.52
14/12 to 16/12 6.0 1.83
16/12 to 18/12 7.0 2.13
18/12 to 20/12 7.5 2.29
20/12 to 21/12 8.0 2.44
Figure 4: Vertical Vent Termination Clearances
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
5
LENNOX HEARTH PRODUCTS • MERIT PLUS® B-VENT GAS FIREPLACES (MPB33/35/40/45) • INSTALLATION INSTRUCTIONS
12 (305) MANTEL
10 (254) MANTEL
8 (203) MANTEL
6 (152) MANTEL
4 (102) MANTEL
4
(102)
12
(305)
10
(254)
2 (51) MANTEL
TOP OF
APPLIANCE
6
(152)
NOTE - Hood shown as positioned in louvered
front model. The hood position in the flush
faced front model is lower than shown.
8
(203)
MANTEL CLEARANCES
Inches (mm)
APPLIANCE AND VENT CLEARANCES
MINIMUM CLEARANCES TO COMBUSTIBLES
The appliance is approved with zero
clearance to combustible materials on all
sides (as detailed in Table 5), with the
following exception: When the unit is
installed with one side fl ush with a wall,
the wall on the other side of the unit must
not extend beyond the front edge of the
unit. In addition, when the unit is recessed,
the side walls surrounding the unit must not
extend beyond the front edge of the unit (see
Figure 3).
Back
Sides
Top Spacers
Floor
Bottom of
Appliance
To Ceiling
Vent
SERVICE CLEARANCES Feet (meters)
Front
1/2 (13)
1/2 (13)
0 (0)
0 (0)
64 (1626)
1 (25.4)
3 ft. (0.9 m)
Table5:Minimum Clearances
[inches (millimeters)]
HEARTH EXTENSION
A hearth extension is not required with this
appliance. If a hearth extension is used, do
not block the control compartment panel.
Any hearth extension used is for appearance
only and does not have to conform to any
requirements for thermal protection.
WALL FINISHES / SURROUNDS / MANTELS
Note: Combustible wall fi nish materials and/
or surround materials must not be allowed
to encroach the area defi ned by the appliance
front face (black sheet metal). Never allow
combustible materials to be positioned in
front of or overlapping the appliance face (see
Figure 35 on Page 21).
Non-combustible materials, such as
surrounds and other appliance trim, may be
installed on the appliance face with these
exceptions: they must not cover any portion
of the removable glass panel, louvers, or
control compartment.
Figure 5: Minimum Mantel Clearances
Vertical installation clearances to combustible
mantels vary according to the depth of the
mantel (See Figure 5). Mantels constructed
of non-combustible materials may be
installed at any height above the appliance
opening; however, do not allow anything to
hang below the fi replace hood.
WARNING
Failure to position the parts in
accordance with these diagrams
or failure to use only parts specifi cally approved with this appliance
may result in property damage or
personal injury.
0” Clearance
to Combustible
Side Wall
Ceiling
64 in.
(1626 mm)
Bottom of Fireplace
Minimum clearance requirements include any
projections such as shelves, window sills,
mantels, etc. above the appliance.
NOTE: We recommend the use of high temperature paint (rated 175 °F, or higher) on the
underside of the mantel.
AVERTISSEMENT
Risque de dommages ou de
blessures si les pièces ne sont
pas installées conformément à
ces schémas et ou si des pièces
autres que celles spécifi quement
approuvées avec cet appareil sont
utilisées.
6
Figure 6: Clearance References
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS® B-VENT GAS FIREPLACES (MPB33/35/40/45) • INSTALLATION INSTRUCTIONS
Anchor
Ta b
PRE-INSTALLATION STEPS
The appliance is shipped with all gas controls
and components installed and pre-wired.
Before installing the appliance, follow these
steps:
1. Remove the shipping carton.
2. Remove the shipping pad, exposing
the front glass door.
3. Open the spring latch securing
the glass door (under the fi rebox
fl oor). Remove the door by tilting
it outward at the bottom and lifting
it up. Set the door aside, taking
care to protect it from inadvertent
damage. See Removing the Glass
Enclosure Panel on Page 19.
4. Remove the log set from the fi rebox.
Handle logs carefully to prevent
breakage.
5. Remove the embers and
volcanic stone from the control
compartment.
TYPICAL INSTALLATION SEQUENCE
The typical sequence of installation is
outlined below; however, each installation
is unique and may result in variations to the
steps described. See the pages referenced in
the following steps for detailed procedures.
Step 1. FRAMING (Page 7): Construct the
appliance framing. Position the appliance
within the framing and secure with nailing
nailing fl anges and fl oor anchor tabs.
Bend out the appropriate nailing fl anges for
the drywall/fi nish material to be used. Nailing
fl anges are provided for fl ush framing, 1/2 in.
and 5/8 in. framing depths (see Figure 10).
Step 2. ROUTING GAS LINE (Page 9): Route
gas supply line to appliance location.
Step 3. INSTALLING VENT SYSTEM
(Page 10): Install the vent system and
exterior termination.
Step 4. FIELD WIRING (Page 11).
a. Millivolt Appliances—Install the operating
control switch (not factory provided). If
installing the optional forced air circulating
blower, bring in electrical service line.
b. Electronic Appliances—Field wire and
install operating control switch.
Step 5. WIRING—OPTIONAL FORCED AIR
BLOWER KIT (Page 12).
Step 6. CONNECTING GAS LINE (Page 12):
Make connection to gas supply.
Step 7. INSTALLING OPTIONAL OUTSIDE
AIR KIT (Page 13)
Step 8. VERIFYING APPLIANCE OPERATION
(Page 14).
Step 9. INSTALLING VOLCANIC STONE,
GLOWING EMBERS, AND LOGS (Page 14).
Step 10. REMOVING AND INSTALLING THE
GLASS DOOR (Page 19).
Step 11. BURNER ADJUSTMENTS (Page 19):
Adjust burner primary air shutter to achieve
proper fl ame appearance.
Step 12. TESTING VENT OPERATION
(Page 21)
Vent operation test and (safety limit) switch
operation.
Step 13. HOOD INSTALLATION (Page 21).
Step 14. FINISHING REQUIREMENTS (Page 21)
Step 15. ATTACHING SAFETY-IN-
OPERATION WARNINGS (Page 21).
DETAILED INSTALLATION STEPS
STEP 1. FRAMING
Frame the appliance as illustrated in Figure 9
on Page 8. All framing details must allow for
a minimum clearance to combustible framing
members as shown in the table on Page 8.
If the appliance is to be elevated above fl oor
level, a solid continuous platform must be
constructed below the appliance.
Note: The framed depth, 16 in. (406 mm) from
a framed wall, must always be measured from
a fi nished surface. If a wall covering such as
drywall is to be attached to the rear wall, then
the 16 in. (406 mm) must be measured from
the drywall surface. It is important that this
dimension be exact.
Headers may be in direct contact with the
appliance top standoff spacers, but must
not be supported by them or notched to
fi t around them. All construction above the
appliance must be self-supporting. DO NOT
use the appliance for structural support.
Secure the fi replace to the side framing
members using the unit’s nailing fl anges
— one top and bottom on each side of the
fi replace front (See Figure 7). Use 8d nails or
their equivalent.
FLOOR NAILING TABS
Fireplace may be anchored to fl oor. Bend
down two anchor tabs (one on each side)
located at the base of the fi replace and
secure to the fl oor by nailing with 8d nails or
equivalent (see Figure 8).
Side
Framing
Left Side Front Corner of Fireplace Shown
(Right Side Requirements the Same)
Note: The nailing flanges, combustible members
and screw heads located in areas directly adjacent
to the nailing flanges, are EXEMPT from the 1/2”
clearance to combustible requirements for the
firebox outer wrapper.
in
direct contact with the nailing flanges and may
be located closer than 1/2” from screw heads and
the firebox wrapper in areas adjacent to the nailing
flanges. Frame the opening to the exact dimensions
specified in the framing details of this manual.
Combustible framing may be
Unit Nailing Flange
(No clearance to
combustible
framing is required)
Figure 7: Unit Secured to Framing by
Nailing Flange
Figure 8: Floor Anchor Tabs
Note: Some units only have one anchor tab
on each side.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
7
LENNOX HEARTH PRODUCTS • MERIT PLUS® B-VENT GAS FIREPLACES (MPB33/35/40/45) • INSTALLATION INSTRUCTIONS
. o N l e d o M
A
t i n U
e z i S
A
g n i m a r F
e z i S
BCD E FGHJ K
. n i5 38 / 1 -5 34 / 1 -5 34 / 1 -9 18 / 5 - 9 17 52 / 1 -4 / 3 - 8 26 14 6 1 / 9 - 68 / 5 - 0 4
m m2 9 85 9 85 9 83 8 48 9 40 6 4 10 3 76 0 42 0 17 6 12 3 0 1
. n i8/
1 - 0 44 / 1 - 0 44 / 1 - 0 44 28 / 5 - 4 26 1 / 3 1 - 1 66 1 / 1 - 0 36 14 6 1 / 9 - 62 3 / 1 1 - 3 4
m m9 1 0 12 2 0 12 2 0 10 1 65 2 60 7 5 19 7 76 0 42 0 17 6 11 0 1 1
. n i8 / 1 - 0 44 / 1 - 5 44 / 1 - 0 44 28 / 5 - 9 28 / 3
- 6 66 1 / 3 - 3 36 14 6 1 / 9 - 66 1 / 5 1 - 6 4
m m6 4 1 19 4 1 12 2 0 10 1 62 5 76 8 6 13 4 86 0 42 0 17 6 12 9 1 1
MPB33
MPB35
MPB40
MPB45
in.
mm
845
842
33-1/4
845
33-1/4
546
21-1/2
286
11-1/4
1232
48-1/2
616
24-1/4
330
13
102
4
103
4-1/16
872
34-5/16
33-1/8
12-3/4
14-11/16
17-3/16
437
373
324
1146
45-1/8
24-7/8
29-7/8
34-7/8
886
759
632
30-11/16
7-1/16
7-1/16
7-1/16
179
179
179
Back Wall of Chase/Enclosure
*Optional FOAK
Outside
Air Kit
Including Finishing Materials
C
if any
B
Fireplace Framing
K
Corner Installation
Header
A
Back Wall of Chase/Enclosure
Including Finishing Materials
D
C
A
E
if any
G
Rough
Framing Face
(Unfinished Shown)
J
A
Rough Framing Face
(Unfinished Shown)
Outside Chase
Back Wall of Chase/Enclosure
Including Finishing Materials
C
F
HH
A
Inside Chase
if any
G
G
Rough
Framing Face
(Unfinished Shown)
8
All framing dimensions calculated for 1/2" dry wall at the appliance face. If sheathing the chase or finishing with other thickness materials,
calculations will need to be made.
* Outside air kit - FOAK (without adaptor). See Figure 22 on Page 16.
Figure 9: Framing Specifi cations
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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