Lennox Montebello DLX, Montebello MDLX40IN, Montebello MDLX40IP, Montebello MDLX45IN, Montebello MDLX45IP Installation Instructions Manual
INSTALLATION INSTRUCTIONS
Montebello® DLX
Direct Vent Gas Fireplaces
MODELS
P/N 506023-15 Rev. A 07/2012
This manual is one of a set of two supporting this product.
Refer to P/N 506025-07 for Care and Operation Instructions.
Ce manuel est disponible en francais, simplement
en faire la demande. Numéro de la pièce 506223-41.
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.
This appliance may be installed in an aftermarket permanently located, manufactured home (USA only) or mobile
home, where not prohibited by local codes. This appliance is only for use with the type of gas indicated on the rating
plate. This appliance is not convertible for use with other gases unless a certified kit is used.
Intertek Report No.
100513650
MDLX40IN
MDLX40IP
ELECTRONIC
MDLX45IN
MDLX45IP
®
WARNING /AVERTISSEMENT/AVISO
• HOT GLASS WILL CAUSE
BURNS.
• DO NOT TOUCH GLASS
UNTIL COOLED.
• NEVER ALLOW CHILDREN
TO TOUCH GLASS.
WARNING: If the information in these instructions
is not followed exactly, a fire or explosion may
result, causing property damage, personal injury,
or death.
- Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
- WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the fire
department.
- Installation and service must be performed by a
qualified installer, service agency or the gas supplier.
• UNE SURFACE VITRÉE CHAUDE
PEUT CAUSER DES BRÛLURES.
• LAISSER REFROIDIR LA SURFACE
VITRÉE AVANT D'Y TOUCHER.
• NE PERMETTEZ JAMAIS À UN ENFANT
DE TOUCHER LA SURFACE VITRÉE.
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.
- QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ :
• Ne pas tenter d’allumer d’appareil.
• Ne touchez à aucan interrupteur. Ne pas vous servir des
téléphones se trouvant dans le bâtiment où vous trouvez.
• Appelez immédiatement votre fournisseur de gaz depuis
un voisin. Suivez les instructions du fournisseur.
• Si vous ne pouvez rejoindre le fournisseur de gaz,
appelez le service des incindies.
- L’installation et l’entretien doivent être assurés par un
installateur ou un service d’entretien qualifié ou par le
fournisseur de gaz.
• EL VIDRIO CALIENTE
CAUSARÁ QUEMADURAS.
• USTED DEBE NUNCA
TOCAR EL VIDRIO CALIENTE.
• LOS NIÑOS DEBEN NUNCA
TOCAR EL VIDRIO.
LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
TABLE OF CONTENTS
Packaging ......................... 2
Introduction ........................ 2
General Information .................. 3
Massachusetts Requirements .......... 4
Cold Climate Insulation ............... 5
Manufactured Home Requirements ...... 5
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Vent Termination Clearances ........... 6
Minimum Clearances to Combustibles ..... 8
Detailed Installation Steps ............. 9
Typical Installation Sequence .......... 9
Step 1. Framing .................... 9
Fireplace and Framing Specifications ...... 10
Step 2. Routing Gas Line ............. 11
Proper Sizing of Gas Line .............. 11
Step 3. Install the Vent System ........ 12
Vertical Termination Systems ........... 13
Vent Section Length Chart ............. 13
Vertical Vent Tables and Figures ......... 16
Horizontal Termination System ......... 17
Horizontal Vent Tables and Figures ...... 19
Step 4. Field Wiring ................. 21
Step 5. Removing Glass Door
Frame Assembly .................. 23
Step 6. Connecting Gas Line .......... 23
Step 7. Checking Appliance
Operation ........................ 23
Step 8. Installing Logs and Panels ...... 24
Step 9. Installing Glass Door .......... 26
Step 10. Burner Adjustments ........... 26
Finishing Requirements ............... 28
Step 11. Attaching Safety-in-
Operation Warnings ................ 29
Installation Accessories ............... 30
Gas Conversion Kits .................. 31
Please read and understand these
instructions before beginning your
installation.
PACKAGING
The assembled fireplace is packaged with the
following:
• Literature Kit (plastic bag shipped inside
rebox), containing Care and Operation
Instructions, Installation Instructions (this
manual), Safety-in-Operation Warning
Labels, and Warranty.
• One (1) bag Glowing Embers
• One (1) bag Platinum Embers
• One (1) bag Volcanic Stone
• Pull Screen Kit
• Remote Control and Wall Receiver
Switch Kit
• Door Modesty Shield
• Log Grate
Note: For use with fireplace as shipped
from factory only. Not for use with
Contemporary Burner/Floor Kit.
REQUIRED ACCESSORIES
The following accessories are required:
• One of the following Firebox Liner Kits:
a. Ceramic Liner Kit—Buff Rustic
b. Ceramic Liner Kit—Red Rustic
c. Porcelain Liner Kit—Black
d. Ceramic Liner Kit—Red Herringbone
e. Ceramic Liner Kit—Buff Herringbone
NOTE: Porcelain kits include side and back
panels. Optional for use with log sets.
Required when using the contemporary
burner/floor kit.
• One of the following Floor Options:
a. Oak Log Set (For use with fireplace as
shipped from factory only. Not for use with
contemporary burner/floor kit.)
b. Contemporary Burner/Floor Kit
Contemporary Burner/Floor Kit requires
one of the following Media Kits:
i. Crushed Glass—Reective Black
ii. Crushed Glass—Platinum
iii. Crushed Glass—Reective Blue
iv. Crushed Glass—Goldfinger
v. Crushed Glass—Copper
Note: The Contemporary Burner/Floor Kit
installation and operation instructions are
provided with the kit, and are not detailed
in this manual.
INTRODUCTION
The Montebello® DLX direct-vent, sealedcombustion gas fireplaces operate on natural
or propane gas. These appliances feature a
remotely controlled electronic intermittent
pilot ignition system (manual adjustment of
the gas valve settings is not possible).
The Montebello DLX is a decorative replace
and may not be installed and operated as the
primary heat source in a dwelling.
Electrical power (120 Vac line voltage) is
recommended to operate the fireplace;
however, four (4) "AA" batteries can be used
for full-time operation or as a backup in case
of a power outage.
Approved Vent Components
These fireplaces are designed, tested, and
listed for operation and installation with
Secure Vent® direct vent system components
(8 in. inner, 11 in. outer) manufactured by
Security Chimneys International.
These approved vent system components
are labeled for identification. USE ONLY
APPROVED VENT COMPONENTS. Do
NOT use any other manufacturer’s vent
components with these appliances.
Codes and Standards
These appliances comply with National
Safety Standards and are tested and listed by
Intertek (Report No. 100513650) to Z21.50
(in Canada, CSA-2.22), and CAN/CGA-
2.17-M91 in both USA and Canada, as vented
gas fireplaces.
These appliances are listed by Intertek
for installation in bedrooms and mobile
homes.
Installation must conform to local codes. In
the absence of local codes, installation must
comply with the current National Fuel Gas
Code, ANSI Z223.1 (in Canada, the current
CAN/CSA-B149.1 installation code).
The appliance, when installed, must be
electrically grounded 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).
2
LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
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 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 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.
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.
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
inflammables 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 fire, burns,
explosion or carbon monoxide
poisoning.
Note: Installation and repair should be done
by a qualified 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 confiées à un technicien
qualifié. 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
qualified, 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 se servir de cet appareil s'il a été
plongé dans l'eau, complètement ou en
partie. Appeler un technicien qualifié
pour inspecter l'appareil et remplacer
toute partie du système de contrôle et
toute commande qui ont été plongés
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.
Provide adequate clearances around air openings and adequate accessibility clearance for
service and proper operation. Never obstruct
the front 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 appliances must not be connected to a
chimney or flue serving a separate solid fuel
burning appliance.
3
LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
These electronic appliances are remotely
controlled and feature an electronic
intermittent pilot ignition system or standing
pilot. External electrical power is required to
operate these units.
These electronic models come standard
with a remotely-modulated gas valve; flame
appearance and heat output cannot be
controlled at the gas valve. The BTU Input for
these appliances is shown in Table 1.
Model No. Input (BTU/Hr)
Natural Gas
MDLX40IN 32,000 to 50,000
MDLX45IN 38,500 to 60,000
Propane Gas
MDLX40IP 32,000 to 50,000
MDLX45IP 38,500 to 60,000
Table 1: Input (BTU/HrR)
Gas Pressure—All Models
Appliance inlet and manifold gas pressure
requirements are listed in Tables 2 and 3.
Fuel # Minimum Maximum
Natural
Gas
Propane
5.5 in. WC
(1.37 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
(.4 kPa)
6.3 in. WC
(1.57 kPa)
3.5 in. WC
(.87 kPa)
10.0 in. WC
(2.49 kPa)
Table 3: Manifold Gas Supply Pressure
Orifice Sizes—Sea Level To High Altitude
(All Models)
These appliances are tested and approved
for installation at elevations of 0–4500 feet
(0–1372 meters) above sea level, using the
standard burner orifice sizes (marked with
an asterisk (*) in Table 4). For elevations
above 4500 feet, contact your gas supplier or
qualied 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; or
• changing the burner orice to a smaller
size as regulated by the local authorities
having jurisdiction and by the (USA)
National Fuel Gas Code NFPA 54/ANSI
Z223.1—latest edition or, in Canada, the
CAN/CSA-B149.1 codes—latest edition.
Install the appliance according to the
regulations of the local authorities having
jurisdiction and, in the USA, the National Fuel
Gas Code NFPA 54 / ANSI Z223.1—latest
edition or , in Canada, the CAN/CSA-B149.1-
latest edition.
NOTE: Flame appearance will diminish 4%
per thousand feet of altitude.
Model Nat.Gas
drill size (inches)
MDLX40 0.1405 in.
(#28)*
• H2286
MDLX45 0.154 in
(#23)*
• H8808
Propane
drill size (inches)
0.086 in.
(#44)*
• H2287
0.093 in.
(#42)*
• H4816
Table 4: Burner Orifice Sizes
Elevation 0–4500 ft ( 0–1372 m)
* Standard size installed at factory
• Part /Cat. Number
Gas Valve Diagram
The SIT Proflame gas valve is shown in
Figure 1.
REQUIREMENTS FOR THE
COMMONWEALTH OF
MASSACHUSETTS
These fireplaces 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.
• Installation and repair must be done by
a plumber or gas fitter licensed in the
Commonwealth of Massachusetts.
• The exible gas line connector used shall
not exceed 36 inches (92 centimeters) in
length.
• The individual manual shut-off must be a
T-handle type valve.
Massachusetts Horizontal Vent Requirements
In the Commonwealth of Massachusetts,
horizontal terminations installed less than
seven (7) feet above the finished grade
must comply with the following additional
requirements:
• A hard wired carbon monoxide detector
with an alarm and battery back-up must
be installed on the floor level where the
gas fireplace is installed. The carbon
monoxide detector must comply with
NFPA 720, be ANSI/UL 2034 listed and be
ISA certified.
• A metal or plastic identication plate must
be permanently mounted to the exterior
of the building at a minimum height of
eight (8) feet above grade and be directly
in line with the horizontal termination.
The sign must read, in print size no less
than one-half (1/2) inch in size, GAS VENT
DIRECTLY BELOW. KEEP CLEAR OF ALL
OBSTRUCTIONS.
Test gauge connections are provided on the
front of the gas control valve (identified IN
for the inlet and OUT for the manifold side).
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).
4
Green Wire
(From DFC Wire
Harness)
Manifold (Out)
Test Port
Inlet (In) Test Port
Wire
(From DFC Wire
Harness)
Main Gas Inlet
3/8 in. NPT
Figure 1: SIT Proflame Valve
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Connect GTMS
Wire Harness
Pressure
Regulator
Tower
Yellow Ground Wire
(From DFC Wire
Harness)
Drywall
Top Of Fireplace
Opening
Non-Combustible
HORIZONTAL VENT
VERTICAL VENT
HORIZONTAL VENT
VERTICAL VENT
LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
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 floor on which appliance rests, if
floor is above ground level. Gas line holes
and other openings should be caulked or
stuffed with unfaced fiberglass insulation.
If the fireplace is being installed on a cement
slab in cold climates, a sheet of plywood
or other raised platform can be placed
underneath to prevent cold transfer to the
fireplace and into the room. It also helps
to sheetrock inside surfaces and tape for
maximum air tightness and caulk firestops.
MANUFACTURED HOME
REQUIREMENTS
This appliance may be installed in
an aftermarket permanently located,
manufactured home and must be installed
in accordance with the manufacturer's
instructions and the Manufactured Home
Construction and Safety Standard, Title 24
CFR, Part 3280, in the United States, or the
Standard for Installation in Mobile Homes,
CAN/CSA Z240 MH Series, in Canada.
Cet appareil peut être installé cómme
du matéri-el d'origine dans une maison
préfabriquée (É.U. seulement) ou mobile
et doit être installé selon les instructions
du fabricant et conformément à la norme
Manufactured Home Constructions and
Safety, Title 24 CFR, Part 3200 aux Unis ou à
la norme Can/CSA-Z240 Série MM, Maisons
mobiles au Canada.
This appliance is only for use with the type
of gas indicated on the rating plate. This
appliance is not convertible for use with other
gases, unless a certified kit is used.
Cet appareil doit être utilisé uniquement
avec le type de gaz indiqué sur la plaque
signalétique. Cet appareil ne peut être
converti à d'autres gaz, sauf si une trousse
de conversion est utilisée.
CAUTION: Ensure that the cross members
are not cut or weakened during installation.
The structural integrity of the manufactured
home floor, wall, and ceiling / roof must be
maintained.
CAUTION: This appliance must be grounded
to the chassis of the manufactured home
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.
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 2: Typical Installation
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 traffic and away
from furniture and draperies (Figure 2).
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 2).
The location should also be free of electrical,
plumbing or other heating/air conditioning
ducting.
These direct-vent appliances are uniquely
suited for installations requiring a utility shelf
positioned directly above the fireplace. Utility
shelves like these are commonly used for
locating television sets and decorative plants.
Cross Corner
Application
Room Divider
Application
Recessed
Application
Island
Application
Flat
Application
Application
Flat on Wall
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 7 on Page 8).
The minimum height from the base of the
appliance to the underside of combustible
materials used to construct a utility shelf in
this fashion is shown in Figure 7 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 flooring, the appliance shall be
installed on a metal or wood panel extending
the full width and depth of the appliance.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
5
LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
3"
(76 mm)
Termination Kit
Combustible Projection
greater than 2-1/2 inches in length
Horizontal Vent Termination Clearances
Combustible Projection
2-1/2 inches or less in length
24"
(610 mm)
Ventilated Or
Unventilated Soffit
12
X
Roof Pitch is X/12
2 FT
MIN.
2 FT MIN.
Lowest
Discharge
Opening
H*
*H = MINIMUM HEIGHT FROM ROOF TO
LOWEST DISCHARGE OPENING OF VENT
TERMINATION HEIGHTS FOR VENTS ABOVE
FLAT OR SLOPED ROOFS
Horizontal Overhang
Vertical
Wall
Vent
Termination
Storm Collar
Concentric
Vent Pipe
Flashing
1 inch (25.4 mm) Minimum
Clearance to Combustibles
VENT TERMINATION CLEARANCES
These instructions should be used as a
guideline and do not supersede local codes
in any way. Install vent according to local
codes, these instructions, the current
National Fuel Gas Code (ANSI-Z223.1) in
the USA or the current standards of CAN/
CSA-B149.1 in Canada.
Vertical Vent Termination Clearances
Terminate multiple vent terminations according
to the installation codes listed above. Also see
Figure 3.
Terminate single vent caps relative to building
components according to Figures 3 and 4.
12”
(305mm)
Minimum
Vertical Vent Termination Clearances
The vent / air intake termination clearances
above the high side of an angled roof is as
shown in the following chart:
Figure 4
Horizontal Vent Termination Clearances
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 3: Multiple Terminations
6
The horizontal vent termination must have a minimum of 3 in. (76 mm) clearance to any
overhead combustible projection of 2 1/2 in. (64 mm) or less (see Figure 5). For projections
exceeding 2-1/2 in. (64 mm), see Figure 6 on Page 7. For additional vent location restrictions
refer to Figure 6 on Page 7.
See Figure 28 on Page 18 for the recess allowances, into
exterior walls, of the square horizontal terminations.
Figure 5: Side Elevation View
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
NOTE: Local Codes Or Regulations May Require
Different Clearances.
NOTE: Location Of The Vent Termination Must Not
Interfere With Access To The Electrical Service.
3 ft.
X
A
3 ft.
Exterior Wall
Horizontal
Termination
B
V
L
X
= Air Supply Inlet
* See Item D in the Text Below.
*18”
24 in.
Inside Corner
Center Line
of Termination
18”
36 in.
DETAIL D
F
V
Ventilated Soffit
V
Fixed
Closed
Window
V
C
A
= Vent Terminal
V
Inside
Corner Detail
G
V
A
= 9 in. in U.S.
A
=12 in. in Canada
B
C
C
C
Operable
V
Window
B
B
= Area where Terminal is NOT permitted
B
A
J
Minimum Clearances Canadian Installation * US Installation **
A = Clearance above grade, veranda, porch, deck
or balcony.
B = Clearance to window or door that may be opened. 6 in. (15.2 cm) for appliances < 10,000 BTU/hr (3kW),
C = Clearance to permanently closed window 12 inches (305 mm) recommended to prevent window
12 inches (30 cm) * 12 inches (30 cm) **
12 in. (30 cm) for appliances > 10,000 BTU/hr (3kW) and <
100,000 BTU/hr (30kW), 36 inches (91 cm) for appliances
> 100,000 BTU/hr (30kW)*
condensation
H
E
D
M
I
X
V
K
6 in. (15.2 cm) for appliances < 10,000 BTU/hr (3kW),
9 in. (23 cm) for appliances > 10,000 BTU/hr (3kW) and <
50,000 BTU/hr (15kW), 12 inches (30 cm) for appliances
> 50,000 BTU/hr (15kW)*
9 inches (229 mm) recommended to prevent window
condensation
V
D = Vertical clearance to ventilated soffit located
24 inches (61.0 cm) 24 inches (61.0 cm)
above the terminal within a horizontal distance of
36 in. (91.4cm) from the center line of the terminal
E = Clearance to unventilated soffit 24 inches (61.0 cm) 24 inches (61.0 cm)
F = Clearance to outside corner 5 inches (12.7 cm) 5 inches (12.7 cm)
G = Clearance to inside corner 36 in. (91.4 cm) 24 inches (61.0 cm)
H = Clearance to each inside of center line extended
above meter / regulator assembly
3 feet (91 cm) within a height of 15 feet above the meter /
regulator assembly *
3 feet (91 cm) within a height of 15 feet above the meter
/ regulator assembly **
I = Clearance to service regulator vent outlet 3 feet (91 cm) * 3 feet (91 cm) **
J = Clearance to non-mechanical air supply inlet
to building or the combustion air inlet to any other
appliance
6 in. (15.2 cm) for appliances < 10,000 BTU/hr (3kW), 12
in. (30 cm) for appliances > 10,000 BTU/hr (3kW) and <
100,000 BTU/hr (30kW), 36 inches (91 cm) for appliances
> 100,000 BTU/hr (30kW)*
6 in. (15.2 cm) for appliances < 10,000 BTU/hr (3kW), 9
in. (23 cm) for appliances > 10,000 BTU/hr (3kW) and <
50,000 BTU/hr (15kW), 12 inches (30 cm) for appliances
> 50,000 BTU/hr (15kW)*
K = Clearance to mechanical air supply inlet 6 feet (1.83 meters) * 3 feet (91 cm) above, if within 10 feet (3 m) horizontally**
L = Clearance above paved sidewalk or paved
7 feet (2.13 m) ‡ 7 feet (2.13 m) ‡
driveway located on public property
M = Clearance under veranda, porch, deck or
18 in. (46.0 cm) * ‡ 18 in. (46.0 cm) ** ‡
balcony
* In accordance with the current CSA-B149.1 National Gas and B149.2 Propane Installation Code—Latest Editions.
** In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Codes—Latest Edition.
‡ A vent shall not terminate directly above a sidewalk or paved driveway which is located between two single family dwellings and serves both dwellings.
*‡ Only permitted if veranda, porch, deck or balcony is fully open on a minimum 2 sides beneath the oor.
Figure 6: Exterior Horizontal Vent Termination Clearance Requirements
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
7
LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
17 in.
431.8 mm
14 in.
355.6 mm
8 1/4 in.
209.6 mm
45°
12 in.
304.8 mm
5 in.
127 mm
12 (305)
10 (254)
8 (203)
6 (152)
4 (102)
7
(178)
17
(432)
15
(381)
13
(330)
2 (51)
9
(229)
11
(279)
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 flush 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 2).
Combustible Shelf Height—
Top Vent—with 2 Feet Vertical Vent and One 90 Degree Elbow
Model Secure Vent
MDLX40 *84-1/16 (2135)
MDLX45 *89-1/16 (2252)
* Includes 3 in. clearance to combustibles (required above vent components)
Inches (millimeters)
®
APPLIANCE MINIMUM CLEARANCES*
Inches (millimeters)
Sides 1/2 (13), 0 (0) Spacers **
Top Spacers 0 (0)
Floor 0 (0)
Back 1/2 (13), 0 (0) Spacers
Bottom of Appliance To Ceiling 69 (1743)
Vent 3 (76) Top * / 1 (25.4) Sides & Bottom
SERVICE CLEARANCES Feet (meters)
Front 3 feet (0.9 meters)
Table 5
*Note: 3 in. (75 mm) above any horizontal/inclined vent component.
**Note: See Page 9, Step 1 for clearance requirements to the
nailing flange located at each side of the unit and any screw heads
adjacent to it. See Page 28 for hearth extension requirements.
Shelf Height
To provide for the lowest possible shelf surface, the venting attached
to the top vent should be routed in a way to minimize obstructions to
the space above the appliance. Do not insulate the space between
the appliance and the area above it (see Figure 7). The minimum
height from the base of the appliance to the underside of combustible
materials used to construct a utility shelf in this fashion is shown in
Figure 7.
Wall Finishes / Surrounds / Mantels
Note: Combustible wall finish materials and/or surround materials
must not be allowed to encroach the area defined 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 9 and Figure 51 on Page 28.
Non-combustible materials, such as surrounds and other appliance
trim, may be installed on the appliance front face with these
exceptions: they must not cover any portion of the removable glass
panel.
Vertical installation clearances to combustible mantels vary according
to the depth of the mantel. See Figure 8. Mantels constructed of
non-combustible materials may be installed at any height above the
appliance opening. 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.
8
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Do not insulate the
space between the
appliance and the
area above it.
Figure 7
Figure 8
Combustible Materials
Allowed In Shaded Area
"Safe Zone"
Side
Wall
Figure 9
Shelf Height
(see table)
Shelf Above Fireplace With Top Venting
MANTEL
MANTEL
MANTEL
MANTEL
MANTEL
MANTEL
Top of Appliance
Top View of
Fireplace
Minimum Distance to
Protected Side Wall
Side
Wall
Minimum Distance to
Unprotected Side Wall
2 1/2 ft
(to centerline)
Vertical
Vent (minimum)
MANTEL
CLEARANCES
Inches (mm)
Fireplace
(side view)
LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
WARNING
Failure to position the parts in
accordance with these diagrams
or failure to use only parts specifically 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 spécifiquement
approuvées avec cet appareil sont
utilisées.
DETAILED INSTALLATION STEPS
The appliance is shipped with all gas
controls and components installed and prewired.
1. Remove the shipping carton, exposing the
front glass door on the valve access side.
2. Using a Phillips screwdriver, unfasten two
(2) screws located at the top of the glass
frame (see Figure 46 on page 26). Tilt the
top of the glass frame away from the unit.
Lift it carefully off the bottom door track
and set the door aside, protecting it from
inadvertent damage.
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 Page numbers references in the
following steps for detailed procedures.
Step 1. (Page 9) Construct the appliance
framing. Position the appliance
within the framing and secure with
nailing brackets.
Step 2. (Page 11) Route gas supply line to
the right side.
Step 3. (Page 12) Install the vent system and
exterior termination.
Step 4. (Page 21) Connect 120 VAC electrical
power to the appliance receptacle.
Step 5. (Page 23) Remove glass
door assembly.
Step 6. (Page 23) Make connection to
gas supply.
Step 7. (Page 23) Verifying
appliance operation.
Step 8. (Page 24) Install ceramic panels,
logs, and glowing embers
OR
contemporary burner/floor kit,
porcelain panels, and media.
Step 9. (Page 26) Install glass
door assembly.
Step 10. (Page 26) Adjust burner to ensure
proper flame appearance.
Step 11. (Page 29) Attach safety in
operation warnings.
Step 1. FRAMING
Frame these appliances as illustrated in
Figure 11 on Page 10, unless the appliance
is to be installed in a corner. See Figure 12
on Page 11 for corner framing installations.
All framing details must allow for a minimum
clearance to combustible framing members
as shown in Table 5 on Page 8.
If the appliance is to be elevated above floor
level, a solid continuous platform must be
constructed below the appliance.
Headers may be in direct contact with the
appliance top spacers but must not be
supported by them or notched to fit around
them. All construction above the appliance
must be self-supporting, DO NOT use the
appliance for structural support.
The fireplace should be secured to the side
framing members using the unit's nailing
flanges—one top and bottom on each side
of the fireplace front (see Figure 10). Use 8d
nails or their equivalent.
Use Top Flange For
1/2” Thick Drywall
Front Of
Fireplace
Use Center Flange
For Flush Mount
Use Bottom Flange For
5/8” Thick Drywall
Left Side Front Corner of Fireplace Shown
(Right Side Requirements the Same)
Unit Being Secured By Its Nailing Flanges
To The Framing
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. Combustible framing may be
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.
Unit Being Secured by Its Nailing
Flanges to the Framing
Figure 10
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
9
LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
E
A
B
D
Top View
Front View
5-3/32 (129)
Right Side View
14-1/8
8-1/2”
(216)
5-1/4”
(133)
(359)
26-15/32
(672)
C
25-29/32
(658)
25-1/2
(648)
7
2-1/2 (64)
(178)
19-5/8
(498)
Gas Inlet
(This
Side
Only)
Electrical
Inlet
8-3/8
(213)
F
G
H
J
Framing should be constructed
of 2x4 or larger lumber.
A
B
C
8-1/2
(216)
13
(
330
)
VENT FRAMING
-
TOP VENT WITH 2 FEET
VERTICAL VENT AND
ONE 90° ELBOW
Framing should be constructed
of 2x4 or larger lumber.
Inches (mm)
(641)
25-1/4
15
(
381
)
6-1/2
(165)
1/2 A
Framing Dimensions
Models A B C
MDLX40
in. 50-3/4 43 75-1/8
mm 1289 1092 1908
MDLX45
in. 56-7/8 48 80-1/16
mm 1445 1219 2034
Thermal Efficiency (%)
Natural Gas Propane
Models P4 P4
MDLX40 35.8 TBD
MDLX45 51.2 TBD
MDLX40
MDLX45
10
Figure 11: Fireplace and Framing Specifications
Model
No.
Notes
A B C D E F G H J
in. 50-5/8 37-1/4 42-7/8 25-5/16 34 37-5/8 33-3/32 29-9/32 34-3/4
mm 1286 946 1089 643 864 956 840 744 883
in. 56-11/16 42-1/4 47-7/8 28-3/8 40-1/8 43-5/8 38-3/32 34-1/2 40-59/64
mm 1440 1073 1216 721 1019 1108 968 876 1039
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Fireplace Dimensions
Diagrams, illustrations and photographs are not to scale – consult
installation instructions. Product
designs, materials, dimensions,
specifications, colors and prices are
subject to change or discontinuance
without notice.
Vent Size
Coaxial DV
Vent Size
8" Inner
11" Outer
LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
Right Side
Front Corner
Of Fireplace
Framing
6-1/4”
(159 mm)
19-5/8”
(498 mm)
C
Back wall of chase/enclosure
(including any finishing materials)
D
A
B
Model
No.
MDLX40
MDLX45
Figure 12: Corner Framing with Square Termination (SV8HTS)
Step 2. ROUTING GAS LINE
Route a 1/2 in. (13 mm) gas line along the
inside of the right side framing as shown
in Figure 13. Gas lines must be routed,
constructed and made of materials that are
in strict accordance with local codes and
regulations.
All appliances are factory-equipped with
a flexible gas line connector and 1/2 inch
shutoff valve. (See Step 6 on Page 22).
The incoming gas line should be piped into
the valve compartment and connected in one
of the two methods as shown in Figure 36
on Page 23.
Figure 13
Proper Sizing of Gas Line
Properly size and route the gas supply
line from the supply regulator to the area
where the appliance is to be installed per
requirements outlined in the National Fuel
Gas Code, NFPA 54—latest edition (USA) or
CAN/CSA-B149.1—latest edition (Canada).
A B C D
in. 50-5/8 83-5/8 59-1/8 41-7/8
mm 1286 2124 1502 1064
in. 56-3/4 89-7/8 63-1/2 44-7/8
mm 1441 2283 1613 1140
Never use galvanized or plastic pipe. Refer to
Table 6 for proper sizing of the gas supply
line, if black iron pipe is being used. Gas lines
must be routed, constructed and made of
materials that are in strict accordance with
local codes and regulations. We recommend
that a qualied individual such as a plumber
or gas fitter be hired to correctly size and
route the gas supply line to the appliance.
Installing a gas supply line from the fuel
supply to the appliance involves numerous
considerations of materials, protection,
sizing, locations, controls, pressure,
sediment, and more. Certainly no one
unfamiliar and unqualied should attempt
sizing or installing gas piping.
Schedule 40 Pipe
Length (feet)
0–10 1/2 in. 3/8 in.
10–40 1/2 in. 1/2 in.
40–100 1/2 in. 1/2 in.
100–150 3/4 in. 1/2 in.
150–200 3/4 in. 1/2 in.
Table 6: Schedule 40 Black Iron
Pipe—Inside Diameter
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Natural
Gas
Propane
Gas
Notes:
• All appliances are factory-equipped with
a flexible gas line connector and 1/2 inch
shutoff valve (see Figure 36 on Page 23).
• See Massachusetts Requirements on
Page 4 for additional requirements for
installations in the state of Massachusetts
in the USA.
• The gas supply line should Not be
connected to the appliance until Step 6
(Page 23).
• A pipe joint compound rated for gas
should be used on the threaded joints.
Ensure propane resistant compounds are
used in propane applications. Be very
careful that the pipe compound does not
get inside the pipe.
• It is recommended to install a sediment
trap in the supply line as close as possible
to the appliance (see Figure 36 on
Page 23).
• Check with local building ofcial for local
code requirements.
IMPORTANT: If propane is used, be aware
that if tank size is too small (i.e. under
100 lbs, if this is the only gas appliance
in the dwelling. Ref. NPFA 58), there
may be loss of pressure, resulting in
insufficient fuel delivery (which can result
in sooting, severe delayed ignition or other
malfunctions). Any damage resulting from
an improper installation, such as this, is
not covered under the limited warranty.
11
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