Lennox Montebello MDLX40IN, Montebello MDLX45IP, Montebello MDLX40IP, Montebello MDLX45IN Installation Instructions Manual
INSTALLATION INSTRUCTIONS
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.
WARNING: If the information in these instructions
is not followed exactly, a fire or explosion may
result, causing property damage, personal injury,
or death.
WARNING /AVERTISSEMENT/AVISO
HOT GLASS WILL
CAUSE BURNS.
DO NOT TOUCH GLASS
UNTIL COOLED
NEVER ALLOW CHILDREN
TO TOUCH GLASS.
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.
EL VIDRIO CALIENTE
CAUSARÁ QUEMADURAS.
USTED DEBE NUNCA
TOCAR EL VIDRIO CALIENTE.
LOS NIÑOS DEBEN NUNCA
TOCAR EL VIDRIO.
- 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.
- 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.
Montebello® DLX
Direct Vent Gas Fireplaces
Intertek Report No.
100513650
P/N 506023-15 Rev. B 04/2013
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.
MODELS
MDLX40IN
MDLX40IP
Decorative Product: Not for use as a heating appliance.
NOTICE: Fireplace is not to be operated by a thermostat.
ELECTRONIC
MDLX45IN
MDLX45IP
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 fac-
tory 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 Firebox Liner Kit - Buff Rustic
b. Ceramic Firebox Liner Kit - Red Rustic
c. Porcelain Firebox Liner Kit - Black
d. Ceramic Firebox Liner Kit - Red Her-
ringbone
e. Ceramic Firebox Liner Kit - Buff Her-
ringbone
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 instal-
lation 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 rec-
ommended 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" inner,
11" outer) manufactured by Security Chimneys
International.
These approved vent system components
are labeled for identification. USE ONLY AP-
PROVED 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/CGA-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
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
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.
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.
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 this appliance if any part has
been under water. Immediately call a
qualified 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.
Input (BTU/HR)
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
Gas Pressure - All Models
Appliance inlet and manifold gas pressure
requirements are listed in Tables 2 and 3.
Inlet Gas Supply Pressure
Fuel # Minimum Maximum
Natural
Gas
Propane
5.5" WC
(1.37 kPa)
11.0" WC
(2.74 kPa)
10.5" WC
(2.61 kPa)
13.0" WC
(3.23 kPa)
Table 2
Manifold Gas Supply Pressure
Fuel # Low High
Natural
Gas
Propane
1.6" WC
(.4 kPa)
6.3" WC
(1.57 kPa)
3.5" WC
(.87 kPa)
10.0" WC
(2.49 kPa)
Table 3
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/CGA-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/CGA-B149.1- latest edition.
NOTE: Flame appearance will diminish 4% per
thousand feet of altitude.
Burner Orifice Sizes
Elevation 0 - 4500 ft ( 0 - 1372 m)
Model Nat.Gas
drill size (inches)
MDLX40 0.1405" (#28)*
• H2286
MDLX45 0.154" (#23)*
• H8808
Table 4
* Standard size installed at factory
• Part /Cat. Number
Propane
drill size (inches)
0.086" (#44)*
• H2287
0.093" (#42)*
• H4816
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 Com-
monwealth 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 certied.
• 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" 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)
LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
Drywall
Top Of Fireplace
Opening
Non-Combustible
HORIZONTAL VENT
VERTICAL VENT
HORIZONTAL VENT
VERTICAL VENT
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 manu-
facturer'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 con-
verti 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.
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.
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.
5
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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” in length
Horizontal Vent Termination Clearances
Combustible Projection
2-1/2” 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” (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/CGA-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
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
Horizontal Vent Termination Clearances
The horizontal vent termination must have a minimum of 3" (76 mm) clearance to any overhead
combustible projection of 2-1/2" (64 mm) or less (see Figure 5). For projections exceeding 2-1/2"
(64 mm), see Figure 5. 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"
Inside Corner
Center Line
of Termination
18”
36"
DETAIL D
F
V
Ventilated Soffit
V
Fixed
Closed
Window
V
C
A
= Vent Terminal
V
Inside
Corner Detail
G
V
A
= 9" in U.S.
A
=12" 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" (15.2 cm) for appliances < 10,000 BTU/hr (3kW),
C = Clearance to permanently closed window 12" (305 mm) recommended to prevent window conden-
12" (30 cm) * 12" (30 cm) **
12" (30 cm) for appliances > 10,000 BTU/hr (3kW) and
< 100,000 BTU/hr (30kW), 36" (91 cm) for appliances >
100,000 BTU/hr (30kW)*
sation
H
E
D
M
I
X
V
K
6" (15.2 cm) for appliances < 10,000 BTU/hr (3kW),
9" (23 cm) for appliances > 10,000 BTU/hr (3kW) and
< 50,000 BTU/hr (15kW), 12" (30 cm) for appliances >
50,000 BTU/hr (15kW)*
9" (229 mm) recommended to prevent window con-
densation
V
D = Vertical clearance to ventilated soffit located
24" (61.0 cm) 24" (61.0 cm)
above the terminal within a horizontal distance of
36" (91.4cm) from the center line of the terminal
E = Clearance to unventilated soffit 24" (61.0 cm) 24" (61.0 cm)
F = Clearance to outside corner 5" (12.7 cm) 5" (12.7 cm)
G = Clearance to inside corner 36" (91.4 cm) 24" (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" (15.2 cm) for appliances < 10,000 BTU/hr (3kW), 12" (30
cm) for appliances > 10,000 BTU/hr (3kW) and < 100,000
BTU/hr (30kW), 36" (91 cm) for appliances > 100,000 BTU/
hr (30kW)*
6" (15.2 cm) for appliances < 10,000 BTU/hr (3kW), 9"
(23 cm) for appliances > 10,000 BTU/hr (3kW) and <
50,000 BTU/hr (15kW), 12" (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" (46.0 cm) * ‡ 18" (46.0 cm) ** ‡
balcony
* In accordance with the current CAN/CGA-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”
432 mm
14”
356 mm
8-1/4”
210 mm
45°
12”
305 mm
5”
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).
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
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" clearance to combustibles (required above vent components)
Do not insulate the
space between the
appliance and the
area above it.
Shelf Height
(see table)
Figure 7
Shelf Above Fireplace With Top Venting
Inches (millimeters)
®
2-1/2 ft
(to centerline)
Vertical
Vent (minimum)
*NOTE: 3" (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 ap-
pliance 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: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
NOTE: We recommend the use of high temperature paint (rated 175° F
or higher) on the underside of the mantel.
8
Figure 8
Combustible Materials
Allowed In Shaded Area
"Safe Zone"
Side
Wall
Figure 9
Top of Appliance
Side
Wall
MANTEL
MANTEL
MANTEL
MANTEL
MANTEL
MANTEL
Top View of
Minimum Distance to
Protected Side Wall
Minimum Distance to
Unprotected Side Wall
CLEARANCES
Inches (mm)
Fireplace
(side view)
Fireplace
MANTEL
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 assem-
bly.
Step 6. (Page 23) Make connection to gas
supply.
Step 7. (Page 23) Verifying appliance opera-
tion.
Step 8. (Page 24) Install firebox liner panels,
logs, and glowing embers
OR
contemporary burner/floor kit, porce-
lain 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
PIPE CENTERLINE
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
Figure 11 - Fireplace and Framing Specifications
10
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
in. 50-5/8 83-5/8 59-1/8 41-7/8
A B C D
mm 1286 2124 1502 1064
MDLX45
in. 56-3/4 89-7/8 63-1/2 44-7/8
mm 1441 2283 1613 1140
Figure 12 - Corner Framing with Square Termination (SV8HTS)
Step 2. ROUTING GAS LINE
Route a 1/2" (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
exible gas line connector and 1/2" 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/CGA-B149.1
- latest edition (Canada).
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 - Black Iron Pipe
Inside Diameter (Inches)
Schedule 40 Pipe
Length (feet)
0 - 10 1/2" 3/8"
10 - 40 1/2" 1/2"
40 - 100 1/2" 1/2"
100 - 150 3/4" 1/2"
150 - 200 3/4" 1/2"
Table 6
Natural
Gas
Propane
Gas
NOTES:
• All appliances are factory-equipped with a
exible gas line connector and 1/2" 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
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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