Lennox Montebello MDLX40IN-PV, Montebello MDLX45IN-PV 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 Power Vent
Direct-Vent Gas Fireplaces

P/N 506023-16 Rev. NC 08/2012

This manual is one of a set of two supporting this product.
Refer to P/N

Ce manuel est disponible en francais, simplement
en faire la demande. Numéro de la pièce 506223-49.

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.

506025-08

for Care and Operation Instructions.

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.

MODELS

MDLX40IN-PV MDLX45IN-PV

Intertek Report No.
100513650PRT-001

Please read and understand these instructions

before starting installation.

ELECTRONIC:

®

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

TABLE OF CONTENTS

Packaging .........................................Page 2

Introduction ......................................Page 2

General Information ..........................Page 2

Massachusetts Requirements ...........Page 4

Cold Climate Insulation .....................Page 5

Manufactured Home Requirements ..Page 5

Location ............................................Page 5

Vent Termination Clearances ............Page 6

Minimum Clearances to Combustibles Page 8

Pre-Installation Steps ........................Page 9

Typical Installation Sequence ...........Page 9

Detailed Installation Steps .................Page 9

Step 1. Framing ...............................Page 9

Fireplace and Framing Specifications Page 10

Step 2. Routing Gas Line ................Page 11

Proper Sizing of Gas Line ..................Page 11

Step 3. Install the Vent System .......Page 12

General Vent Information ..................Page 12

Power Vent Components...................Page 12

Vent Section Length Chart ................Page 13

Offset Installation ..............................Page 13

Horizontal Termination System .........Page 16

Installing Power Vent Termination ....Page 16

Step 4. Field Wiring .........................Page 18

Step 5. Removing Glass Door

Frame Assembly ...............................Page 20

Step 6. Connecting Gas Line ...........Page 21

Step 7 Install Firebox Liner ............Page 21

Step 8. Verifying Appliance

Operation ..........................................Page 21

Step 9. Installing Logs ...................Page 22

Step 10. Install/Remove Glass

Door Assembly .................................Page 24

Step 11. Burner Adjustments ............ Page 24

Finishing Requirements ....................Page 26

Step 12. Attaching Safety-in-

Operation Warnings ...................

Installation Accessories ....................Page 28

PACKAGING

The assembled vented gas fireplace is packaged with:

BOX 1—Fireplace:

• Literature Kit (plastic bag shipped

inside rebox),

• Bags of Glowing Embers, Platinum Embers,

and Volcanic Stone

• Pull Screen

• Door Modesty Shield

• Adaptor with Probe Assembly

• (1) Remote Control Kit and Receiver Kit

Page 27

BOX 2—Power Vent Components:

• (1) Power Vent Termination

• (1) Termination Adaptor

• (1) Horizontal Firestop Assembly

• (1) Vacuum Hose

• (1) 11/32 in. Hose Clamp

• (1) Strain Relief

• (1) Bushing

• (4) Insulated 1/4 in. Male Terminals

• (2) #10 Ring Terminals

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—Reective Black

ii. Crushed Glass—Platinum

iii. Crushed Glass—Reective Blue

iv. Crushed Glass—Goldfinger
v. Crushed Glass—Copper

NOTE: The Contemporary Burner/Floor Kit

installation instructions are provided
with the kit, and are not detailed in this
manual.

INTRODUCTION

These Electronic appliances are designed to
operate on natural gas and have an electronic

intermittent pilot ignition system. External
120 Volt AC electrical power is required to

operate these units.
These vented gas fireplaces are sealed

combustion gas replaces designed for
residential, manufactured home, and

commercial applications.
Use Only These Approved Vent Components

These replaces are designed, tested and
listed for operation and installation with, the
following (4 1/2 in. inner and 7 1/2 in. outer)
vent components only:

• Secure Vent® Direct-vent system

components manufactured by Security

Chimneys International.

These approved vent system components

are labeled for identication. Do NOT use any

other manufacturer’s vent components with
these appliances.

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.

2

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

Codes and Standards

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

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.

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.

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.

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.

Only trim kit(s) supplied by the
manufacturer shall be used in the
installation of this appliance.

WARNING

AVERTISSEMENT

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.

Ne pas utiliser cet appareil s’il a été
plongé, même partiellement, dans
l’eau. Appeler un technicien qualifié
pour inspecter l’appareil et remplacer
toute partie du système de commande
et toute commande qui a été plongée
dans l’eau.

These appliances comply with National
Safety Standards and are tested and listed

by Intertek (Report No. 100513650) to
Z21.50b-2009 (in Canada, CSA-2.22b-2009),
and CAN/CGA-2.17-M91 (R2009) in both
USA and Canada, as vented gas replaces.

These appliances are listed by Intertek for
installation in bedrooms and manufactured
(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/NFPA 54 (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.

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 gas. 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.

These electronic appliances are remotely
controlled and feature an electronic

intermittent pilot ignition system. 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)
MDLX40IN-PV 26,500–42,000
MDLX45IN-PV 35,000–48,000

Table 1: Input (BTU/HR), Natural Gas

of this appliance can cause
serious injury or death from
fire, burns, explosion or
carbon monoxide poisoning.

Seules les trousses de garniture
fournies par le fabricant doivent
être utilisées pour l’installation de
cet appareil.

3

LENNOX HEARTH PRODUCTS • MONTEBELLO® POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS

Gas Pressure—All Models

Tables 2 and 3 show the appliance inlet and

manifold gas pressure requirements.

Minimum Maximum

5.5 in. WC

(1.37 kPa)

10.5 in. WC

(2.62 kPa)

Table 2: Inlet Gas Supply Pressure

Low High

1.6 in. WC

(.40 kPa)

3.5 in. WC

(.87 kPa)

Table 3: Manifold Gas Supply Pressure

Test gauge connections are provided on the
front of the gas control valve; identified IN
for the inlet and OUT for the manifold side
(see Figure 1).

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).

Gas Valve Diagram

See Figure 1 for gas valve diagram.

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

PURGE CYCLE
This is a power vented fireplace
that requires household electrical
power to operate. It will not operate
during a power failure. When the
fireplace is turned off, the exhaust
blower will continue to operate for
approximately fifteen (15) seconds
after shutdown to expel the exhaust
gases from the venting system.

Orifice Sizes—Sea Level To High Altitude

These appliances are tested and approved

for installation at elevations of 0–4500 ft
(0–1370 m) above sea level, using the
standard burner orice sizes (marked with an
"*" in Table 4). For elevations above 4500 ft,
contact your gas supplier or quali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 orice 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 code—latest edition.

Install the appliance according to the
regulations of the local authorities having

jurisdiction, and the (USA) National Fuel Gas
Code NFPA 54 / ANSI Z223.1—latest edition,
or (Canada) CAN/CSA-B149.1—latest edition.

NOTE: Flame appearance will diminish 4%
per one thousand feet of altitude.

Connect GTMS
Wire Harness

Pressure
Regulator
Tower

Yellow Ground Wire
(From DFC Wire
Harness)

Model Orifice Size / Catalog Number

MDLX40IN-PV 0.125 in. (1/8 in.) * H7924 •
MDLX45IN-PV 0.136 in. (#29) * H8141 •

* Standard size installed at factory

• Part /Cat. Number

Table 4: Burner Orifice Size
Elevation 0–4500 ft (0–1370 m)

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 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 tter licensed in the
Commonwealth of Massachusetts.

• The exible gas line connector used shall
not exceed 36 in. (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 oor level where the
gas replace is installed. The carbon
monoxide detector must comply with
NFPA 720, be ANSI/UL 2034 listed and be

ISA certified.

• A metal or plastic identication 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.

Figure 1: SIT Electronic Gas Valve

4

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • 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 oor on which appliance rests, if oor
is above ground level. Gas line holes and
other openings should be caulked or stuffed
with unfaced berglass insulation.

If the replace is being installed on a cement

Cross Corner

Application

Room Divider

Application

Recessed

Application

Island

Application

Flat

Application

Application

Flat on Wall

NOTE: 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.

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 restops.

Horizontal

Termination

Drywall

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.

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.

Figure 2: Typical Installation

Fireplace

Top of Fireplace

Opening

Noncombustible

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.

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.

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.

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.

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.

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 ooring, 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® POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

VENT TERMINATION CLEARANCES

These instructions should be used as a
guideline and do not supersede local codes
in any way. Install venting according to
local codes, these instructions, and the
current (USA) National Fuel Gas Code
ANSI-Z223.1 / NFPA 54, or (Canada) CAN/
CSA-B149.1 standards.

Horizontal Vent Termination Clearances

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 3).
For projections exceeding 2 1/2 in. (64 mm),

see Figure 4. For additional vent location
restrictions refer to Figure 4 and Table 5 on
Page 7.

2 1/2 in. or less in length

Combustible Projection

Greater than 2 1/2 in. in length

Ventilated or

Unventilated Soffit

See Figure 19 on Page 17 for the re­cess allowances, into exterior walls,
of the power vent terminations.

24 in.

(610 mm)

Side Elevation View

Power Vent Termination

Combustible

Figure 3: Horizontal Vent Termination Clearances

Combustible Projection

3 in.

(76 mm)

18 in.

(457 mm)

6

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • 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.

H

3 ft.

X

A



3 ft.

M

I

E

D

X

V

K

Exterior Wall

Horizontal

Termination

B

V

L

X

= Air Supply Inlet

* See Item D in the Text Below.

*18”

24 in.

Inside Corner

of Termination

18”

36 in.

DETAIL D

F

V

Center Line

Ventilated Soffit

V

Window

V

C

A

= Vent Terminal

V

Fixed

Closed

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

Figure 4: Exterior Horizontal Vent Termination Clearance Requirements

Minimum Clearances Canadian Installation * US Installation **

Clearance above grade, veranda, porch, deck

A

or balcony.

B Clearance to window or door that may be opened.

C Clearance to permanently closed window

12 in. (30 cm) * 12 in. (30 cm) **

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 in. (91 cm) for appliances > 100,000 BTU/hr

(30kW)*

12 in. (305 mm) recommended to prevent

window condensation

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 in. (30 cm) for appliances > 50,000 BTU/hr

(15kW)*

9 in. (229 mm) recommended to prevent

window condensation

Vertical clearance to ventilated soft located above

D

the terminal within a horizontal distance of 36 in.

24 in. (61.0 cm) 24 in. (61.0 cm)

(91.4cm) from the center line of the terminal

E Clearance to unventilated soffit 24 in. (61.0 cm) 24 in. (61.0 cm)

F Clearance to outside corner 5 in. (12.7 cm) 5 in. (12.7 cm)

G Clearance to inside corner 36 in. (91.4 cm) 24 in. (61.0 cm)

Clearance to each inside of center line extended

H

above meter / regulator assembly

3 ft (91 cm) within a height of 15 ft above the meter /
regulator assembly *

3 ft (91 cm) within a height of 15 ft above the meter /
regulator assembly **

I Clearance to service regulator vent outlet 3 ft (91 cm) * 3 ft (91 cm) **

Clearance to non-mechanical air supply inlet to

J

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 in. (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 in. (30 cm) for appliances > 50,000 BTU/hr

(15kW)*

K Clearance to mechanical air supply inlet 6 ft (1.83 m) * 3 ft (91 cm) above, if within 10 ft (3 m) horizontally**

Clearance above paved sidewalk or paved

L

driveway located on public property

7 ft (2.13 m) ‡ 7 ft (2.13 m) ‡

M Clearance under veranda, porch, deck or balcony 18 in. (46.0 cm) * ‡ 18 in. (46.0 cm) ** ‡

Table 5: Exterior Horizontal Vent Termination Clearance Requirements

* 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 Gas Code—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.

V

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

7

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

12 (305) MANTEL

10 (254) MANTEL

8 (203) MANTEL

6 (152) MANTEL

4 (102) MANTEL

4

(102)

14

(356)

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)

MINIMUM CLEARANCES TO COMBUSTIBLES

Appliance And Vent Clearances

The appliance is approved with zero clearance to combustible materials

on all sides. Refer to Table 6 for minimum clearance values. For typical
installations, see Figure 2 on Page 5.

Sides

Top Spacers

Floor

Back

Bottom of Appliance To C eili ng

Vent

1/2 in. (13 mm)

0 in. (0 mm) Spacers **

0 in. (0 mm)
0 in. (0 mm)

1/2 in. (13 mm)

0 in. (0 mm) Spacers

64 in. (1626 mm)

3 in. (76 mm) Top*

1 in. (25.4 mm) Sides & Bottom

Table 6: Appliance Minimum Clearances

Front

3 ft (0.9 m)

Table 7: Appliance Service Clearances

* 3 in. (75 mm) above any horizontal/inclined vent component.

** 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.

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 6 and Figure 44 on Page 26.

Noncombustible 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 5). Mantels constructed of
noncombustible materials may be installed at any height above the
appliance. Minimum clearance requirements include any projections
such as shelves, window sills, mantels, etc. above the appliance.

Figure 5: Minimum Mantel Clearances

Top View of

Fireplace

At 0 in. minimum
side wall clearance,
one combustible
wall can project to
any length.

Mantel Leg,

Trim, or Wall

3 1/2 in.

(89 mm)

Combustible materials
may project beyond
either side of the
fireplace opening as
long as they are kept
within the shaded
“Safe Zone” area.

45

o

Figure 6: Minimum Distance to Unprotected Side Wall

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.

5/8 in. Thick Drywall

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

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. Using a Phillips screwdriver, unfasten the
two (2) screws located at the top of the glass

frame (see Figure 40 on Page 24). 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.

4. 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 page numbers references in the

following steps for detailed procedures.

DETAILED INSTALLATION STEPS

Step 1. FRAMING

Frame these appliances as illustrated in
Figure 8 on Page 10, unless the appliance is

to be installed in a corner. See Figure 9 on
Page 11 for corner framing installations. All

framing details must allow for a minimum

clearance to combustible framing members

as shown in Table 6 on Page 8.

If the appliance is to be elevated above oor
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 t

around them.

The replace should be secured to the side
framing members using the unit nailing
anges—one top and bottom on each side

of the fireplace front (see Figure 7). Use 8d

nails or their equivalent.

Use Top Flange For
1/2 in. Thick Drywall

Front Of
Fireplace

Use Center Flange
For Flush Mount

Use Bottom Flange For

Note: The nailing flanges, combustible members
and screw heads located in areas directly adjacent
to the nailing flanges, are EXEMPT from the 1/2 in.
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 in. 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.

Left Side Front Corner of Fireplace Shown
(Right Side Requirements the Same).

Figure 7: Unit Secured by Nailing

Flanges to the Framing

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 18) Field Wiring
Connect 120 VAC electrical power to

the appliance receptacle.

Step 5. (Page 20) Remove glass door

assembly.

Step 6. (Page 21) Make connection to gas

supply.

Step 7. (Page 21) Install rebox liner kit.
Step 8. (Page 21) Verify appliance operation.
Step 9. (Page 22) Install volcanic stone,

glowing embers, and logs.

Step 10. (Page 24) Install glass door

assembly.

Step 11. (Page 24) Adjust burner to ensure

proper flame appearance.

Step 12. (Page 27) Attach Safety-in-

Operation Warnings.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

9

E

A

B

D

Top View

Front View

5 3/32 in. (129)

Right Side View

14 1/8 in.
8 1/2 in.
(216)

5 1/4 in.
(133)

(359)

26 15/32 in.

(672)

C

25 29/32 in.

(658)

25 1/2 in.

(648)

7 in.

2 1/2 in. (64)

(178)

19 5/8 in.

(498)

Gas Inlet

(This

Side

Only)

Electrical

Inlet

8 3/8 in.

(213)

F

G

H

J

8 / 11 in.

Vent / Intake

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

A

B

C

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 in.

1/2 A

10 1/2 in.
(267)

7 in.

(178)

5 1/8 in.

(130)

12 1/8 in.

(308)

FIREPLACE AND FRAMING SPECIFICATIONS

Adaptor Plus 4 ft
Vertical
Vent (min.)
and 90° Elbow

Model No. A B C *

MDLX40IN-PV

MDLX45IN-PV

Table 8: Framing Dimensions

* C = Adaptor Plus 4 ft Vertical Vent (min.) and 90° Elbow

in. 50 3/4 43 139 1/8

mm 1289 1092 3534

in. 56 7/8 48 144 1/8

mm 1445 1219 3661

10

Model

No.

MDLX40IN-PV

MDLX45IN-PV

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

A B C D E F G H J

Table 9: Fireplace Dimensions

Figure 8: Fireplace and Framing Specifications

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Vent Size

Co-axial DV

Vent Size

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.

4 1/2 in. Inner
7 1/2 in. Outer

Notes

C

Back wall of chase/enclosure

(including any finishing materials)

D

A

B

6 1/4 in.

(159 mm)

19 5/8 in.

(498 mm)

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

Length Inside Diameter

0–10 ft (0–3.1 m) 1/2 in. (12.7 mm)

10–40 ft (3.1–12.2 m) 1/2 in. (12.7 mm)

40–100 ft (12.2–30.5 m) 1/2 in. (12.7 mm)
100–150 ft (30.5–45.7 m) 3/4 in. (19.1 mm)
150–200 ft (45.7–61.0 m) 3/4 in. (19.1 mm)

Table 11: Schedule 40 Black Iron Pipe
Inside Diameter

Gas lines must be routed, constructed

and made of materials that are in strict
accordance with local codes and regulations.

We recommend hiring a qualied plumber

or gas fitter 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

Figure 9: Corner Framing with Power Vent Termination

of materials, protection, sizing, locations,
controls, pressure, sediment, and more. Only
a qualied installer should attempt sizing or

installing gas pipe.

Model No. A B C D

MDLX40IN-PV

MDLX45IN-PV

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

Table 10: Dimensions for Corner Framing with Power Vent Terminations

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 10. 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 in. shutoff

valve. (see Step 6 on Page 21).

Proper Sizing of Gas Line

Figure 10: Right-Front Corner of

Fireplace Framing

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 (USA) National
Fuel Gas Code, ANSI Z223.1/NFPA 54—latest
edition, or (Canada) CAN/CSA-B149.1—

latest edition.

Notes:

• All appliances are factory-equipped with
a exible gas line connector and 1/2 in.

shutoff valve (see Figure 30 on Page 21).

• 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 21).

• A pipe joint compound rated for gas
should be used on the threaded joints. Be

very careful that the pipe compound does
not get inside the pipe.

• Installing a sediment trap in the supply
line as close as possible to the appliance

is recommended.

• Check with local building ofcial for local
code requirements.

Never use galvanized or plastic pipe. Refer to
Table 11 for proper sizing of the gas supply

line, if black iron pipe is being used.

11

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

Step 3. INSTALL THE VENT SYSTEM

General Information

These instructions should be used as a
guideline and do not supersede local
codes in any way. Install venting according
to local codes, these instructions, and

the (USA) National Fuel Gas Code, ANSI
Z223.1/NFPA 54—latest edition, or
(Canada) CAN/CSA-B149.1—latest edition.

These fireplaces are designed, tested and
listed for operation and installation only
with Secure Vent® (SV4.5) and Secure Flex®
Direct-Vent System Components,
manufactured by Security Chimneys
International. These approved vent system
components are labeled for identification.
DO NOT use any other manufacturer's vent
components with these appliances.

Ensure clearances are in accordance
with local installation codes and the
requirements of the gas supplier.

Dégagement conforme aux codes
d'installation locaux et aux exigences du
foumisseunde gaz.

Power Vent Components

Locate the replace as instructed in this manual. Make the following modications to add the
components used with the Power Vent Kit. This kit may only be used in conjunction with Direct­Vent series electronic versions of Lennox Hearth Products Fireplaces. This installation must
conform with local codes, or, in the absence of local codes, with the (USA) National Fuel Gas
Code, ANSI Z223.1/NFPA 54—latest edition, or (Canada) CAN/CGA-B149.1—latest edition.

CAUTION: This power vent kit cannot be used with millivolt appliances. Use the kit only
with the electronically controlled fireplaces listed for its use as shown in this document.

Item No.

1 604187-01 Adaptor Assembly With Probe 1

2 601970-01 Vacuum Hose 1
3 601451-01 Termination Assembly 1
4 74L61 SV Termination Adaptor (SV4.5RCH) 1

5 102010-01 Strain Relief—3/8 in. 1
6 H2246 Firestop Assembly (Horizontal) 1

7 102022-01 Hose Clamp—11/32 in. 2
8 P-8-7102 Snap Bushing 1
9 — Ring Terminal—#10 2

10 — Insulated 1/4 in. Male Terminal 4

Part

Number

Description Qty.

Table 12: Power Vent Kit Components

Use only approved venting components.
See Approved Vent Components on Page 2.

These fireplaces must be vented
directly to the outside.

The vent system may not service multiple

appliances, and must never be connected to
a ue serving a separate solid fuel burning
appliance. The vent pipe is tested to be run
inside an enclosed wall (such as a chase).
There is no requirement for inspection

openings in the enclosing wall at any of the

joints in the vent pipe.

Venting System

With the appliance secured in framing,

determine vent routing and identify the

exterior termination location. The following
sections describe horizontal (exterior wall)

vent applications. A list of approved venting
components is shown on Page 28.

1

2

3

5

7

4

6

8

8

9

12

Figure 11: Power Vent Kit Components

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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LENNOX HEARTH PRODUCTS • MONTEBELLO® POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

VENT SECTION LENGTHS

Determine the number of straight vent
sections required. 4 1/2 in. (114 mm),
10 1/2 in. (267 mm), 22 1/2 in. (572 mm),
34 1/2 in. (876 mm) and 46 1/2 in.
(1181 mm) net section lengths are available
(see Table 14).

Offset Installation

Analyze the vent routing and determine

the quantities of vent sections and number
of elbows required. Refer to Figures 16

and 17 on Page 15 showing vent run

requirements to aid in selecting the type of

vertical installation desired. Vent sections are
available in net lengths of 4 1/2 in. (114 mm),
10 1/2 in. (267 mm), 22 1/2 in. (572 mm),
34 1/2 in. (876 mm) and 46 1/2 in.
(1181 mm). Refer to the Vent Section
Length Chart for an aid in selecting length

combinations. Elbows are available in 90°
and 45° congurations. Refer to Figure 15
on Page 14 for the SV4.5 E45 and SV4.5 E90
elbow dimensional specications.

Where required, a telescopic vent section
(SV4.5LA) may be used to provide the

installer with an option in installing in tight
and confined spaces or where the vent run

made up of xed length pieces develops a
joint in a undesirable location, or will not
build up to the required length. The SV4.5LA

Telescopic Vent Section has an effective
length of from 1 1/2 in. (38 mm) to 6 3/4 in.
(171 mm). The SV4.5LA is tted with a
dimpled end (identical to a normal vent

section component) and a plain end with 3

pilot holes. Slip the dimpled end over the

locking channel end of a standard SV4.5 vent
component the required distance and secure

with three screws.

Maintain a minimum 1 in. (25 mm)
clearance to combustible materials for
all vertical elements. Clearances for all
horizontal elements are 3 in. (76 mm)
on top, 1 in. (25 mm) on sides and 1 in.
(25 mm) on the bottom.

Model Effective Length

SV4.5L6 4 1/2 in.
SV4.5L12 10 1/2 in.
SV4.5L24 22 1/2 in.
SV4.5L36 34 1/2 in.
SV4.5L48 46 1/2 in.

Table 13: Effective Vent Length

Table 14: Vent Section Length

Note: Convert inches into metric equivalent
measurement, as follows:

Millimeters (mm) = Inches x 25.4
Centimeters (cm) = Inches x 2.54
Meters (m) = Inches x .0254

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

13

8 1/8 in.

(206 mm)

4 13/16 in.

(122 mm)

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

A. Frame ceiling opening—Use a plumb line
from the ceiling above the appliance to locate

center of the vertical run. Cut and/or frame

an opening, 10 1/2 in. x 10 1/2 in. (267 mm x
267 mm) inside dimensions, about this center

mark (Figure 12).

10 1/2 in. min.

(267 mm)

10 1/2 in. min.

(267 mm)

Plumb Bob

Ceiling Framing

Figure 12: Framing Ceiling Opening

B. Attach adaptor (with probe) to appliance
collar—Secure Vent® SV4.5 direct-vent

system components are unitized concentric
pipe components featuring positive twist lock
connections (see Figure 13).

All of the appliances covered in this
document are fitted with collars having
locking inclined channels. The dimpled end
of the adaptor fits over the appliance collar to
create the positive twist lock connection.

Align the dimple (four places) of the
upper vent section with the opening
of the locking incline channel on
the lower vent section or appliance
collar. Twist vent component
clockwise to engage and seal until

Arrow

Adaptor on Appliance Collar
or Vent Section

arrow and dimple align.

Dimple

Locking Incline
Channel

Connected Vent
Sections

Arrow

Figure 13: Attaching the Vent Adaptor

The unitized design of the Secure Vent®

components will engage and seal both the inner

and outer pipe without the need for sealant or

screws. If desired a #6 x 1/2 in. screw may be
used at the joint, but it is not required as the

pipe will securely lock when twisted.

C. Attach vent components to each other—

Other vent sections may be added to the

previously installed section in accordance

with the requirements shown in Figures 16
and 17 on Page 15.

To add another vent component to a length

of vent run, align the dimpled end over

the inclined channel end of the previously

installed section, adjusting the radial

alignment until the four locking dimples are
aligned with the inlets of the four incline
channels of the previous section.

Push the vent component against the

previous section until it fully engages, then

twist the component clockwise running the
dimples down and along the incline channels
until they seat at the end of the channels.

This seating position is indicated by the
alignment of the arrow and dimple as
shown in Figure 13.

D. Install firestop/spacer at ceiling—When

using Secure Vent, use SV4.5VF restop/
spacer at ceiling joists. If there is living space
above the ceiling level, the restop/spacer
must be installed on the bottom side of the
ceiling. If attic space is above the ceiling,
the restop/spacer must be installed on the
top side of the joist. Route the vent sections

through the framed opening and secure
the firestop/spacer with 8d nails or other
appropriate fasteners at each corner.

Maintain 1 in. (25 mm) clearance to
combustibles, framing members, and attic
or ceiling insulation when running vertical
chimney sections. Attic insulation shield
(H3907) may be used to obtain the required
clearances indicated here. See installation
accessories on Page 28. The gap between
the vent pipe and a vertical firestop may be
sealed with noncombustible caulking.

E. Support the vertical vent run sections -

Blocking

Support Straps
(Plumber's
tape)

Support the vertical portion of the venting
system every eight feet (2.4 m) above the
fireplace vent outlet. One method of support

is by utilizing eld provided support straps
(conventional plumber's tape). Secure the
plumber's tape to the framing members

with nails or screws. Strap the tape around

the vent, securing the ends of the tape to
the framing. If desired, sheet metal screws
#6 x 1/2 in. length may be used to secure the

support straps to the vent pipe.

F. Change vent direction to horizontal/
inclined run—At transition from or to a

horizontal/inclined run, install the SV4.5E45
and SV4.5E90 elbows in the same manner as
the straight vent sections. The elbows feature
a twist section to allow them to be routed
about the center axis of their initial collar
section to align with the required direction
of the next vent run element. Twist elbow

sections in a clockwise direction only so as
to avoid the possibility of unlocking any of
the previously connected vent sections (see

Figures 13 and 15).

Swivel Joint

(360° swivel)

SV4.5E45

45° Elbow)

Swivel Joint

(360° swivel)

SV4.5E90

90° Elbow)

Figure 15: Vent Elbow Sections

G. Continue installation of horizontal/
inclined sections—Continue with the

installation of the straight vent sections in

horizontal/inclined run as described in Step
C. Install support straps every three feet

(914 mm) along horizontal/inclined vent runs
using conventional plumber’s tape (Figure 16
on Page 15).

NOTE: Maintain the horizontal/inclined
run in a straight, slightly elevated plane—
approximately 1/4 in. per foot (20 mm
per meter)—in a direction away from
the fireplace. Smaller rise per foot run
ratios are acceptable, down to at or near
level. Use a carpenter’s level to measure
from a constant surface and adjust the
support straps as necessary.

To attach a vent component to the adaptor

on appliance collar, align the dimpled end
over the adaptor collar, adjusting the radial

alignment until the four locking dimples are
aligned with the inlet of the four inclined
channels on the collar (refer to Figure 13).
Push the vent component against the

collar until it fully engages, then twist the
component clockwise, running the dimples

down and along the incline channels until
they seat at the end of the channels.

14

8 ft (2.4 m)

Maximum

1/2 in. (13 mm)
minimum
clearance to
combustibles

Figure 14: Supporting Vertical Vents

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

NOTE: Maintain the required clearances to
combustibles: 1 in. (25 mm) at all sides
for all vertical runs; and 3 in. (76 mm) at
the top, 1 in. (25 mm) at sides, and 1 in.
(25 mm) at the bottom for all horizontal/
inclined runs.

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

VENT FIGURES

Notes:

• Secure Vent® components (rigid vent pipe and terminal) are shown.

• Two 45° elbows may be used in place of one 90° elbow.

• SV4.5VF (Secure Vent) firestop/spacer must be used anytime vent pipe passes through a combustible floor or ceiling. SV4.5HF (Secure Vent)
firestop/spacer must be used anytime vent pipe passes through a combustible wall.

• Maintain the horizontal/inclined run in a straight, slightly elevated plane—approximately 1/4 in. per foot (20 mm per meter)—in a direction
away from the fireplace. Smaller rise per foot run ratios are acceptable, down to at or near level. Use a carpenter’s level to measure from a
constant surface and adjust the support straps as necessary.

Power Vent
Termination

Exterior
Wall

Horizontal / Inclined Run

SV4.5L 6 / 12 / 24 / 36 / 48

Vent Sections

Firestop / Spacer

Support
Brackets

Ceiling

Building
Support
Framing

SV4.5E90
Elbow

Vertical Rise

66 ft max.

4 ft min.

Exterior
Wall

Minimum

Vent Run

Horizontal

10 ft

Power Vent
Termination

Figure 16: Typical Power Vent Routing

Maximum Number Of Elbows

Maximum Feet Of Run

Minimum Horizontal Run

Minimum Vertical Run

Maximum Vertical Rise

— 6

A + B 110 ft

B 10 ft

A

A 66 ft

Table 15: Power Venting

Maximum Horizontal

Venting 110 ft

Up to 6 Elbows

Floor

Venting Can Run Up To
3 ft Below Unit

Adaptor Plus 4 ft Vertical Vent

(min.) and 90° Elbow

Probe Adaptor
(required)

A

(See Chart)

Probe Adaptor

(required)

Fireplace

B

Probe Adaptor

(Required)

Vertical Vent Pipe

Horizontal Vent Pipe

1.0 in. (25.4 mm)

Top—3 in. (76.2 mm)

Sides—1 in. (25.4 mm)

Bottom—1 in. (25.4 mm)

Table 16: Minimum Clearance to Combustibles

Figure 17: Power Vent Routing with Probe Adaptor

15

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

HORIZONTAL (OUTSIDE WALL)
TERMINATION SYSTEM

See Figures 16 and 17 on Page 15

illustrating the various horizontal venting

congurations that are possible for use

with these appliances. Table 15 on Page 15
shows each system’s minimum and

maximum vertical and horizontal length
values that can be used to design and

install the vent components in a variety
of applications.

The horizontal vent system terminates

through an outside wall. Building codes
limit or prohibit terminating in specic

areas. Refer to Figure 4 on Page 7 for
location guidelines.

Secure Vent® SV4.5 direct-vent system
components are unitized concentric pipe
components featuring positive twist

lock connection, (refer to Figure 13 on
Page 14). All of the appliances covered in

this document are fitted with collars having
locking inclined channels. The dimpled
end of the vent components fit over the
appliance collar to create the positive twist
lock connection.

A. Plan the vent run—
Analyze the vent routing and determine

the types and quantities of sections
required 4 1/2 in. (114 mm), 10 1/2 in.
(267 mm), 22 1/2 in. (572 mm), 34 1/2 in.
(876 mm) and 46 1/2 in. (1181 mm)
net section lengths are available. Make
allowances for elbows as indicated in

Figure 15 on Page 14.

Maintain a minimum 1 in. (25 mm)

clearance to combustibles on the
vertical sections. Clearances for the
horizontal runs are: 3 in. (76 mm) on
top, 1 in. (25 mm) on sides, and 1 in.
(25 mm) at the bottom.

B. Frame exterior wall opening—

Locate the center of the vent outlet on the

exterior wall according to the dimensions

shown in Figure 8 on Page 10.

Cut and/or frame an opening, 10 1/2 in.

x 12 1/8 in. (267 mm x 308 mm) inside
dimensions, about this center.

C. Frame ceiling opening—If the vertical

route is to penetrate a ceiling, use a
plumb line to locate the center above the
appliance. Cut and/or frame an opening,
10 1/2 in. x 10 1/2 in.(267 mm x 267 mm)
inside dimensions, about this center (see

Figure 12 on Page 14).

16

D. Attach vent components to appliance—

To attach a vent component to the

appliance collar, align the dimpled end
over the collar, adjusting the radial

alignment until the four locking dimples
are aligned with the inlets of the four
incline channels on the collar (refer to
Figure 13 on Page 14).

Push the vent component against the

collar until it fully engages, then twist the
component clockwise, running the dimples

down and along the incline channels
until they seat at the end of the channels.
The unitized design of the Secure Vent

components will engage and seal both the

inner and outer pipe elements with the same
procedure. Sealant and securing screws are

not required.

E. Attach vent components to each other—

Other vent sections may be added to the

previously installed section in accordance

with the requirements of the vent tables.

To add another vent component to a

length of vent run, align the dimpled

end of the component over the inclined
channel end of the previously installed

section, adjusting the radial alignment

until the four locking dimples are aligned
with the inlets of the four incline channels
of the previous section. Push the vent
component against the previous section

until it fully engages, then twist the

component clockwise running the dimples
down and along the incline channels
until they seat at the end of the channels.

This seating position is indicated by the
alignment of the arrow and dimple as
shown in Figure 13 on Page 14.

F. Install firestop/spacer at ceiling—

When using Secure Vent, use SV4.5VF

restop/spacer at ceiling joists. If there
is living space above the ceiling level, the
restop/ spacer must be installed on the
bottom side of the ceiling. If attic space
is above the ceiling, the restop/ spacer
must be installed on the top side of the
joist. Route the vent sections through the

framed opening and secure the firestop/
spacer with 8d nails or other appropriate

fasteners at each corner. The gap between
the vent pipe and a restop can be sealed
with noncombustible caulking.

Maintain 1 in. (25 mm) clearance to

combustibles, framing members, and
attic or ceiling insulation when running
vertical chimney sections.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

G. Support the vertical run sections—

On the vertical run, support the venting

system every eight feet (2.4 m) above the

fireplace vent outlet with field provided

support straps (Plumber's tape). Attach

the straps to the vent pipe and secure to

the framing members with nails or screws.
H.Change vent direction—At transitions

from or to a horizontal/inclined run, install
the SV4.5E45 and SV4.5E90 elbows in

the same manner as the straight vent

sections. The elbows feature a twist
section to allow them to be routed about
the center axis of their initial collar section
to align with the required direction of
the next vent run element. Twist elbow

sections in a clockwise direction only so
as to avoid the possibility of unlocking
any of the previously connected vent
sections (see Figure 13 on Page 14).

I. Continue installation of horizontal/

inclined sections—Continue with the

installation of the straight vent sections

in horizontal/inclined run as described

in Step E. Install support straps every

three feet (1914 mm) along horizontal/

inclined vent runs using conventional

plumber’s tape (see Figure 16 on
Page 15).

NOTE: Maintain the horizontal/inclined
run in a straight, slightly elevated
plane—approximately 1/4 in. per foot
(20 mm per meter)—in a direction away
from the fireplace. Smaller rise per foot
run ratios are acceptable, down to at or
near level. Use a carpenter’s level to
measure from a constant surface and

adjust the support straps as necessary.

Installing Power Vent Termination

J. Assemble vent run to exterior wall—If

not previously measured, locate the
center of the vent on the exterior wall.
Prepare an opening as described in this
manual. Assemble the vent system to

a point where the terminus of the last
section is within 8 in. of the outside wall

surface where the power vent is to be

mounted (see Figure 18 on Page 17).

If the terminus of the last section is not

within this distance, use the telescopic
vent section SV4.5LA, as the last vent

section. For wall thicknesses greater than
that shown in Figure 19 on Page 17, refer
to Table 17 on Page 17 for the additional
venting components needed (in addition

to the termination and adaptor) for a

particular range of wall thicknesses.

K. Attach termination adaptor—Attach

the adaptor (SV4.5RCH—provided with
the power vent kit) to the vent section
telescoping vent section, or elbow, as

shown in Figures 18 and 19 on Page 17

in the same manner as any SV4.5

vent component.

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

L. Install Firestop/Spacer at exterior wall—

Install SV4.5HF Firestop/Spacer, provided

with the power vent kit, over the opening
at the exterior side of the framing, long
side up, with the 3 in. spacer clearance

at the top as shown in Figure 18, and
nail into place. The Firestop/Spacer may

also be installed over the opening at

the interior side of the framing. The gap

between the vent pipe and a restop can
be sealed with noncombustible caulking.

(The Firestop/Spacer may also be installed

over the opening at the interior side of the

framing).

M. Install the Power Vent termination—

From outside the exterior wall, slide

the collars of the termination onto the
adaptor until the termination seats against

the exterior wall surface to which it
will be attached. Orient the housing of

the termination with the arrow pointed
upwards. Secure the termination to the

exterior wall. The termination must not
be recessed into the exterior wall or
siding by more that the 1 1/4 in. (32 mm)

as shown in Figure 19.

The Power Vent termination has been
designed to perform in a wide range of
weather conditions. Terminations meet
or exceed industry standards.

When selecting the location of
termination, do not place the
termination where water from eaves
and adjoining roof lines may create
a heavy flow of cascading water onto
the termination. If the termination
must be placed where the possibility
of cascading water exists, it is the
responsibility of the builder to direct the
water away from the termination cap by
using gutters or other means.

Carefully follow the Installation
Instructions for the termination,
including the use of silicone caulking
where required.

Power Vent

1 in.

Termination

3 in.

(76 mm)

it is recommended that the Firestop/Spacer (SV4.5HF)

7 in.

5 1/8 in.

(130 mm)

(178)

12 1/8 in.
(308 mm)

Adaptor

SV4.5RCH

6 to 48 in. Vent Section,

Telescopic vent section,

Elbow or Appliance Collar

To help minimize water infiltration

be installed on the exterior side of the wall.

10 1/2 in.
(267 mm)

Note: Centerline of Vent Piping is

NOT the Same as the Centerline of

the Frame Opening.

See Figure 8 on Page 10 for Minimum
Distance to Base of Appliance

Base of Appliance

(25.4 mm)

Figure 18: Installing Power Vent Horizontal Termination

*Use silicone caulking to
seal the top and sides of
the termination, up to the
underlayment, stucco, or
masonry wall surface.

*Caulk

*Caulk

Stucco

Siding

**For thicknesses greater
than 9 1/4 in., see Table 17

Interior Surface of

Finished Wall

Maximum Extent of Vent Run
Sections Relative to Exterior
Surface of Framing

Last Vent Section.

Use Telescopic Vent

Section (SV4.5LA),

If Necessary

Power Vent

Termination

Adaptor
SV4.5RCH

Maximum wall thickness

9 1/4 in.(235 mm)**

Exterior Surface of Siding

Exterior Surface of

Framing

6 in. to 9 1/4 in.

(152 to 235 mm)**

Power Vent
Termination

1 1/4 in. Maximum Recess of
the Square Termination into
Exterior Finishing Material

Figure 19: Venting Connection and Exterior Wall Recessing of the Power Vent

Horizontal Termination

See Table 17 as an aid in venting component
selection for a particular range of exterior
wall thicknesses.

WARNING: The vent termination
is hot while in operation and for a
period of time following the use of
the fireplace. Young children should
be carefully supervised when in the
same area as a hot termination.

Vent Components Required Exterior Wall Thickness

Termination Kit Only 6–9 1/4 in.(152–235 mm)

Termination Kit and 6 in. Vent Section (SV4.5L6) 10 3/4–14 in. (273–356 mm)
Termination Kit and 12 in. Vent Section (SV4.5L12) 16 3/4–20 in. (426–508 mm)
Termination Kit and Telescopic Section (SV4.5L12) 11 3/4–20 in. (299–508 mm)

Table 17: Venting Components Required for Various Exterior Wall Thicknesses—
when Using the Power Vent Termination

17

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

Step 4. FIELD WIRING
CAUTION: Label all wires prior to disconnection when

servicing controls. Wiring errors can cause improper and
dangerous operation.

ATTENTION: Au moment de l'entretien des commandes,
étiquetez tous les fils avant de les débrancher. Des erreurs
de cáblage peuvent entraîner un fonctionnement inadéquat
et dangereux.

Verify proper operation after servicing.

S'assurer que l'appareil fonctionne adéquatement une fois
l'entretien terminé.

CAUTION: Ground supply lead must be connected to the wire
attached to the green ground screw located on the outlet
box. See Figures 27 and 28 on Page 20. Failure to do so will
result in a potential safety hazard. The appliance must be
electrically grounded in accordance with local codes or, in the
absence of local codes, the (USA) National Electrical Code,
ANSI/NFPA 70—latest edition, or the Canadian Electrical
Code, CSA C22.1—latest edition.

Route Cable

NOTE: Electrical wiring must be performed by a qualified electrician.

• Install the strain relief in the hole provided on the right side of

fireplace for the electrical wiring (see Figure 20).

• Either use the intgrated junction box, or position an electrical
junction box (not provided) within reach of the termination wiring
pigtail (see Figure 23 on Page 19). Route the pigtail to the junction
box as the termination is installed.

• Route 14 gauge AWG grounded solid wire Romex® or equally-sized
stranded cable (e.g., SJOT) from the replace to the newly installed
junction box near the termination. Ensure the cable is safety

plated to prevent damage from framing nails and finish drywall
screws. Route it into the lower control compartment and cut to

length before installing the terminals. Install provided hardware on
the ends of the cable. Cable is not provided. The provided crimp
terminals are intended for use with stranded cable. If using Romex,

connect per National Electric Code or local code.

• Refer to Figure 25 on Page 19 and install the electrical hardware
on the ends of the cable. Male terminals on the Black and White
wires, and ring terminals on the ground wire.

• Using standard electrical practices and the terminals provided,
connect the three wires of the cable to the termination pigtail
within the Electrical junction box. Ensure ground.

• The replace end of the cable will be addressed in Connecting

The Power Vent To The Fireplace Control System.

Probe (1 *)

Hose Clamp (7 *)

Vacuum Hose (2 *)

Adaptor Assembly

* See Figure 11 on Page 12

Figure 21: Vacuum Hose Connection to Probe

Vacuum Hose

Pressure Switch

Strain
Relief

14 Gauge
Grounded
Romex or

similar

Stranded

Cable

Vacuum

Hose

Snap

Bushing

Wall Switch

Harness

Figure 20: Routing Wiring

18

Pressure switch is located
behind the panel on the right
side of firebox

Right Side

of Fireplace

Firebox

Vacuum Hose

Junction Box

Pressure Switch

NOTE: Pressure switch style may vary from that shown.

Figure 22: Vacuum Hose Connection to Pressure Switch

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

Wiring—Fireplace (See Figures 27 and 28 on Page 20)

NOTE: These electronic appliances must be connected to the
main power supply. The gas valve is set in place and pre-wired at
the factory.

1. Route a 3-wire 120 Vac 60 Hz 1ph power supply to the appliance

junction box.

2. Remove the electrical inlet cover plate from the side of the unit by

removing the plate securing screws (see Figure 8 on Page 10).

3. Remove the cover plate knockout and then feed the power supply

through the knockout opening and into the unit junction box.

4. Connect the black power supply to the power outlet red pigtail lead and
the white power supply to the common terminal of the outlet as shown
in Figures 27 and 28 on Page 20.

5. Connect the ground supply to the pigtail lead attached to outlet
green ground screw.

6. Wall-mounted ON/REMOTE/OFF burner control switch and remote

control kits may be used. Mount the switch in a convenient location

on a wall near the fireplace.

NOTE: One end of the supplied wire (15 ft) is factory-connected and
the other end is attached to the side of the unit.

CAUTION: Do Not connect the ON/REMOTE/OFF wall switch to a
120 V power supply.

8. Turn the wall-mounted ON/REMOTE/OFF burner control switch to

the OFF position.

9. After the wiring is complete, replace the cover plate.

• Refer to Figure 26 and install the electrical hardware on the fireplace
end of the cable. Male terminals (#10) on the Black and White
wires, and ring terminals (#9) on the ground. The termination end
of the cable will be connected to the termination with wire nuts
(not provided).

• Refer to Figure 26 to connect the three wires of the cable to the
termination. Ensure the ground ring terminal is grounded beneath
a structural screw as shown. Attach the junction box cover to the

termination with the screw previously removed.

• The replace end of the cable will be addressed in Connecting The
Power Vent To The Fireplace Control System.

Black and White

Cable

Ground Wire

10

9

Figure 24: Cable Connections

Wiring—Power Vent Termination

Alternate Instructions (For use when access to the termination is easy

and a secondary electrical junction box installation is not desired).

• Remove the junction box cover from the termination by removing

the attaching screw (see Figure 23).

• Loosen the strain relief on the termination shown in Figure 25. Pull
the pigtail in and shorten it to t within the junction box cover.

WARNING: Crimp connectors may be used on stranded cables (such
as SJOT cable) only. Solid wire Romex must be connected per the
National Electric Code, NEC 70—latest version, or local codes.

• Route 14 gauge AWG grounded solid wire Romex or equally sized
stranded cable (e.g., SJOT) from the replace to the newly installed
junction box near the termination. Ensure the cable is safety

plated to prevent damage from framing nails and finish drywall
screws. Route it into the lower control compartment and cut to

length before installing the terminals. Install provided hardware on
the ends of the cable. Cable is not provided. The provided crimp
terminals are intended for use with stranded cable. If using Romex,

connect per National Electric Code or local code.

Strain Relief

Figure 25: Back of Termination

Pigtail Wires Cut

Off and Shortened

Cable

Ground Cable to
The Termination

Pigtail

Junction Box Cover

Figure 23: Bottom of Termination

Attaching Screw

Figure 26: Junction Box Cover Removed

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Strain Relief Holding Cable

Wire Nuts

19

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

Field Wired

Junction Box

Tab Intact

Tab
Intact

n e e r G - d n u o r G

e t i h W - l a r

t
u e N

120 VAC - Black

Green
Ground

White

Green

Neutral

Side

Hot

Side

Red

Black

ELECTRONIC WIRING DIAGRAM

(Schematic representation only)

COLOR CODE:
B = Black
BB = Brown w/Black Stripe
BG = Brown w/Green Stripe
BL = Blue
BR = Brown
G = Green
GY = Gray
O = Orange
R = Red
W = White
Y = Yellow

Note: On models
without pressure

switch, these

connectors are

plugged together.

Air Pressure Switch

BR

Power Vent Only

Main Wire

Harness

G

Y

Battery Holder with Switch

Battery Holder w/Switch
ON/ Remote
/OFF

Y

Battery Holder
Wire Harness

GR

ON/Remote/OFF

B

O

R

BL

O

G

BL

G

W

R

B

R

B

WH

B

W

Power Vent Blower

Power Vent
Models Only

885 Valve

G

Optional
Split Flow

Reset Switch

(See instructions.)

B

Pilot Tube

Control Module

IPI Pilot

Fuse

Flame
Sensor

Spark
Electrode

B

B

Ground Y

B

W

G

Main Power Cord

580489-01

Figure 27: Electronic Wiring Diagram

Figure 28: Junction Box Wiring—

20

120 V, 60 hz, 1-phase

Step 5. REMOVE THE GLASS
DOOR ASSEMBLY

Refer to Figure 40 on Page 24 and remove
the front glass door assembly as follows:

To remove the rescreens, lift up the center

of the rod to disengage it from the center

WARNING

bracket, bend down at center, hold left side
with hand until it disengages from left side,

• Handle this glass with
extreme care! Glass is
susceptible to damage—
Do not scratch or
handle roughly.

• Do not attempt to substitute
the materials used on this
door, or replace cracked
or broken glass with any

being careful not to scratch the paint. Slowly

remove the rod from the right side.

Using a Phillips screwdriver, unfasten the
two (2) screws located at the top of the
glass door assembly.

Tilt the glass door assembly at the top away
from the unit. Lift it carefully off the bottom
door track and set the glass door assembly
aside, protecting it from inadvertent damage.

materials other than those
provided by the appliance
manufacturer.

• The glass door of this
appliance must only be
replaced as a complete
unit as provided by the
manufacturer. Do not attempt
to replace broken, cracked,
or chipped glass separately.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Gas
Valve

3/8 in. NPT x

Flare Fitting

3/8 in. Flex Tubing

3/8 in. Nipple

3/8 in. Union

3/8 in. Close

Nipple

3/8 in. Shut-off Valve

1/2 x 3/8 in.

Reducer

Gas

Stub

1/2 x 3/8 in. Flare

Shut-off Valve

Gas Solid Line Connector

Gas Flex Line Connector

*Sediment
Trap

3 in.

Min

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

Step 6. CONNECTING GAS LINE

All codes require a shut-off valve mounted in

the supply line. The orientation of the shut­off valve should face the front. Figure 30
illustrates two methods for connecting the
gas supply. A Sediment Trap is recommended

to prevent moisture and debris in gas line

from damaging the valve.

The ex-line method is acceptable in the USA

where local codes permit. Installation must

be in compliance with local codes. These
appliances are equipped with a gas ex-line

for use in connecting the unit to the gas line.
See Figure 30 for ex-line description.

A manual shutoff valve is also provided with

the ex-line. The gas control valve is located

on the right side of the unit.

When using solid gas line connector, access
the valve by removing the front door
assembly on the valve access side and the

access plate (see Figure 29).

The electronic control valve has a 3/8 in.

(10 mm) NPT thread gas supply inlet.

Secure all joints tightly using appropriate
tools and sealing compounds.

NOTE: Using a soapy water solution is

an effective leak test solution but it is not
recommended, because the soap residue
that is left on the pipes/fittings can result
in corrosion over time.

A. Light the appliance (refer to the

lighting instructions label in control

compartment or in the Care and Operation

instructions manual).

B. Brush all joints and connections with the

gas leak test solution to check for leaks.

If bubbles are formed, or gas odor is

detected, turn the unit off. Either tighten
or refasten the leaking connection, then
retest as described above.

C. When the gas lines are tested and leak

free be sure to rinse off the leak testing

solution.

D. Re-install the access plate, making certain

the gasket has not been damaged.

Note: The gas supply
line must be installed in
accordance with building
codes by a qualified
installer approved and/
or licensed as required
by the locality. In the
Commonwealth of
Massachusetts, installation
must be performed by a
licensed plumber or gas
fitter.

Bring the shutoff valve on the end of the
ex-line over to the hard pipe and tighten
with wrenches from above through the
rebox opening.

Right Side

Modesty Panel

Access Plate

Gas Shutoff

Valve

Gas Valve

Figure 29: Fireplace Right Side

TEST ALL CONNECTIONS FOR GAS LEAKS
(FACTORY AND FIELD)

Never use an open flame to
check for leaks.

Turn on gas supply and test for gas leaks using
a gas leak test solution (also referred to as

bubble leak solution).

WARNING

Figure 30: Gas Connection

Step 7. INSTALL FIREBOX LINER KIT

Install the rebox liner kit per the

included instructions.

Step 8. VERIFYING APPLIANCE
OPERATION

Turn on burner then observe the individual
tongues of ame on the burner. Make sure all

ports are open and producing flame evenly

across the burner. If any ports are blocked, or
partially blocked, clean out the ports.

With gas line installed run initial system

checkout before closing up the front

of the unit. Follow the pilot lighting
instructions provided.

NOTE: Lighting Instructions are also found
on the literature tag tied to the bracket
above the gas valve. To access the tag,
reach into the right side opening.

When rst lighting the appliance, it will take

a few minutes for the line to purge itself of

air. Once purging is complete, the pilot and
burner will light and operate as indicated
in the instruction manual. Subsequent
lighting of the appliance will not require such

purging. Inspect the pilot flame (remove

logs, if necessary, handling carefully).

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Electronic Appliance Checkout

To light the burner, turn the ON/REMOTE/

OFF wall switch or remote control to the ON
position. Ensure the igniter lights the pilot.
The pilot flame should engulf the flame
sensor as shown in Figure 31.

NOTE: The control must detect the pressure
switch in the open state, at startup, and
then close after the blower starts.

Igniter
Rod

Flame
Sensor

Pilot
Nozzels

Pilot Hood

Figure 31: Electronic Pilot

Assembly—Proper Pilot
Flame Appearance

21

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

Step 9. INSTALL VOLCANIC STONE, GLOWING EMBERS,
AND LOGS

NOTE: If installing the contemporary burner/floor kit,
skip this step and instead refer to the instructions
provided with the kit.

WARNING

• DO NOT operate this appliance without the
required accessories properly installed:

—floor (log set or contemporary kit), and
—panels (ceramic or porcelain).

WARNING

• DO NOT attempt to install the logs until the

appliance installation has been completed, the
gas line connected and tested for leaks and the
initial burner operation has been checked out.

• The size and position of the log set was

engineered to give the appliance a safe, reliable
and attractive flame pattern. Any attempt to
use a different log set in the fireplace will
void the warranty and will result in incomplete
combustion, sooting, and poor flame quality.

• Logs get very hot and will remain hot up to one

hour after gas supply is turned off. Handle only
when logs are cool. Turn off all electricity to
the appliance before you install grate, volcanic
stone, embers and logs.

• This appliance is not designed to burn wood. Any

attempt to do so could cause irreparable damage to
the appliance and prove hazardous to your safety.

• If logs are not installed according to the log

installation instructions, flame impingement and
improper combustion could occur and result in soot
and/or excessive production of carbon monoxide
(CO), a colorless, odorless, toxic gas.

Cat. No. Model Description

88L53 FGE Bag of Glowing Embers
80L42 FDVS Bag of Volcanic Stone

H8312 PGE Bag of Platinum Embers

Table 18: Firebox Accessories

Step 5. Position the individual logs as shown in Figures 36

through 39. Logs should be placed in the order shown. Place

logs 2 and 3 against the pins on the grate, NOT over them.

Proper log and twig placement is critical to encourage

outstanding flame appearance and prevent sooting. When

positioned properly, as shown, twigs will be positioned
between ame peaks and will not impinge any ames.

Volcanic Stone

Figure 32: Volcanic Stone Placement

(MDLX45IN-PV Shown)

Figure 33: Separating Glowing Embers

Step 1. Install the ceramic or porcelain panels per the instructions

provided in kit (P/N 506019-91).

Step 2. Place volcanic stone around the burner (the entire bag of

volcanic stone will NOT be used). DO NOT PLACE VOLCANIC

STONE ON THE BURNER. See Figure 32.

Step 3. Separate the glowing embers (rockwool) into pieces about the

size of a quarter (see Figure 33). Keep the pieces uffed, not
matted. Distribute these pieces over the burner as shown in

Figure 34. Do not use more than is necessary. When properly

positioned, the glowing embers will cover approximately 75%
of the burner.

Step 4. Distribute the platinum embers over the burner as desired. Do

not use more than is necessary.

NOTE: Excessive use of embers may result in sooting or
poor flame. This appliance is provided with enough embers
for several applications, do not use all that is in a new
bag. For best glowing effect, replace the ember material
annually. Replacement volcanic stone, glowing embers,

22

and platinum embers are available (see Table 18).

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Glowing Embers (Rockwool)

Figure 34: Glowing Ember Placement

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

MDLX40IN-PV and MDLX45IN-PV Log Placement

2

3

6

7

5

Log Number Description

1 Log, Center
2 Log, Rear
3 Log, Center/Left

4 Log, Center/Right

5 Log, Rear/Top
6 Log, Front/Left
7 Log, Front/Center

Figure 35: Complete Log Set

2

1

4

Align Groove At The Bottom Of Log (2) Over
The Grate And Push It Towards The Rear.

Figure 37: Placing Log 2

3

4

Align Two Holes At Bottom Of Log (1)
Over The Pins On The Gas Burner.

Figure 36: Placing Log 1

1

Engage Logs (3 & 4) With The Grate Pins And Align Groves At
The Bottom Of The Logs Over The Grate.

Figure 38: Placing Logs 3 and 4

6 5

Engage Log (6) With The Grate Pin
And Align Groove At The Bottom Of
The Log Over The Grate.

Align Hole At Bottom Of Log (5)
Over The Pin On Log (2).

Engage Log (7)
With The Pin On
Log (4).

7

2

4

Figure 39: Placing Logs 5, 6 and 7

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

23

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

Step 10. INSTALLATION AND REMOVAL
OF GLASS DOOR

WARNING

• When reinstalling the glass

door, the door latch screws
must be securely tightened
to prevent the glass door
from falling out, which could
potentially cause damage
and possible injury.

• Do not attempt to substitute

the materials used on this
door, or replace cracked or
broken glass.

• Handle this glass with

extreme care! Glass is
susceptible to damage—Do
not scratch or handle roughly
while reinstalling the glass
door frame.

• The glass door of this

appliance must only be
replaced as a complete
unit as provided by the
manufacturer. Do not attempt
to replace broken, cracked or
chipped glass separately.

• Do not attempt to touch

the front enclosure glass
with your hands while the
fireplace is in use.

WARNING

Do not operate appliance with
the glass front removed, cracked
or broken.

AVERTISSEMENT

Ne pas utiliser l'appareil si le
panneau frontal en verre n'est
pas en place, est craqué ou
brisé.

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.

Installing Glass Enclosure Panel
(see Figure 40)

To install the front glass door assembly,
proceed as follows:

1. Retrieve the glass door assembly. Visually
inspect the gasket on the backside of the
panel. The gasket surface must be clean, free

of irregularities and seated firmly.

2. Position the door frame in front of the

rebox opening and engage the bottom
ange over the rail at the bottom of the
rebox opening.

3. Swing the door up and back. Ensure the

gasket seats evenly as the door draws shut.
Engage the nut insert and fasten with two
screws to secure the door.

4. Install the door modesty shield on top
ange glass door as follows: grab the door
modesty shield with both hands, with the

open hem going down and engage it with the

upper lip of the glass door frame by pushing
it all the way down. Make sure the installed

shield is firmly in place.

5. With the firescreen hanging on the screen

rod, drop in the right side of the rod to the right

modesty panel. Then drop in the left side of the
rod through the slot of the left modesty panel.

Make sure that the rod is supported by the
bracket in the center of the replace.

WHEN INSTALLING THE GLASS DOOR,
SECURELY TIGHTEN THE LATCH SCREWS—
SEE THE FIRST WARNING ON THIS PAGE.

When installing the glass door, ensure the
spacing on both sides are equal.

Top Flange Glass door
assembly

Latch
Screws

Glass Door Latch (2)

Step 11. BURNER ADJUSTMENTS

Flame Appearance and sooting

Proper flame appearance is a flame which is

blue at the base and becomes yellow-orange
in the body of the ame. When the appliance
is rst lit, the entire ame may be blue and

will gradually turn yellow-orange during
the first 15 minutes of operation. After 15

minutes of operation, if the ame is blue, or if

the flame is orange with evidence of sooting

(black tip), the air shutter opening may need
to be adjusted.

If the air shutter opening is closed too far,

sooting may develop. Sooting is indicated

by black puffs developing at the tips of very
long orange ames. Sooting results in black
deposits forming on the logs, appliance
inside surfaces and on exterior surfaces
adjacent to the vent termination.

Sooting is caused by incomplete combustion
in the ames and lack of combustion air

entering the air shutter opening. To achieve
a warm yellow-orange flame with an

orange body that does not soot, the shutter
opening must be adjusted between these

two positions.

Air Shutter Adjustment Guidelines

• If there is smoke or soot present, rst

check the log set positioning to ensure
that the flames are not impinging on
any of the logs. If the log set is properly
positioned and a sooting condition still

exists, then the air shutter opening should
be increased.

• The more offsets in the vent system, the larger
the air shutter opening will need to be.

• An appliance operated with the air shutter
opened too far, may have ames that appear
blue and transparent. These weak, blue and

transparent flames are termed anemic.

The following chart is provided to aid in

correctly adjusting the air shutter.

Amount of

Primary Air

If air shutter is
closed too far

If air shutter is
open too far

Flame

Color

Flame will
be orange

Flame will
be blue

Air Shutter

Adjustment

Air shutter
gap should be
increased

Air shutter
gap should be
decreased

Table 19: Air Shutter Adjustment

Only doors certified with the appliance
shall be used.

Seules des portes certifiées pour cet
appareil doivent être utilisées.

WARNING: DO NOT abuse glass door by
striking or slamming shut.

24

Firebox Floor

Glass Door Assembly

Figure 40: Installing the Glass Door

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

Air Shutter

Opening

Burner

Orifice

Gas

Valve

Venturi

Venturi

Burner Air Shutter Adjustment Procedure

WARNING

• Air shutter adjustment
should only be performed
by a qualified professional
service technician.

• Ensure that the front glass

door assembly is in place
and sealed After adjustment.

Main Burner Factory Air Shutter

Opening Setting—Inches (millimeter)

Model Nat.Gas

MDLX40IN-PV
MDLX45IN-PV

1/8 in. (3.18 mm)
1/8 in. (3.18 mm)

CAUTION

Soot will be produced if the
air shutter is closed too much.
Any damage due to carboning
resulting from improperly
setting the air shutter is not
covered under the warranty.

To adjust the ame, move the adjustment air
shutter (located on the lower venturi) back or

forward to increase or reduce the air shutter

opening, respectively. Position the air shutter

to the factory setting as shown in Figure 41.

Allow the burner to operate for at least 15
minutes. Observe the ame continuously.

If it appears weak or sooty as previously

described, adjust the air shutter until the

flame appearance is as desired.

When satisfied that the appliance operates

properly, nish the installation. Leave the
ON/REMOTE/OFF wall switch in the REMOTE

position and turn the remote switch OFF.

Use the remote to adjust the flame height
as desired.

Figure 41: Air Shutter Adjustment

Contemporary Media Shown (MDLX40)

Figure 42: Burner Flame Appearance

Rustic Oak Logs Shown (MDLX45)

Figure 43: Burner Flame Appearance

25

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Glass Door

Assembly

Fireplace

Finish Combustible
Or Non-Combustible
Material

Bottom Of
Fireplace

1/8 in.
Minimum

Door Track

Finish Combustible
Or Non-Combustible
Material

Front Face
Of Fireplace

Floor Panel

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

FINISHING REQUIREMENTS
Wall Details

Complete the finished interior wall. To install the appliance facing

ush with the nished wall, position framework to accommodate the

thickness of the finished wall (Figure 44).

3 in. Min.

(76 mm)*

Combustible
Finished Wall
Materials

Header
(2x4’s)

Combustible
materials are
allowed above
this point on
the face of the
appliance.

8 3/8 in. Min.

(213 mm)

The gray shaded
area must be
non-combustible
or Dura Rock

1 in.

(25.4mm)

Minimum

Top of

Appliance

Spacers

Adaptor Plus 4

Feet Vertical

Vent (Min.)
& 90° Elbow

Noncombustible materials, such as surrounds and other appliance trim,
may be installed on the appliance front face with the exceptions.

Vertical installation clearances to combustible mantels vary according to
the depth of the mantel (see Figure 5 on Page 8). Mantels constructed
of noncombustible materials may be installed at any height above the

appliance opening.

Combustible materials may project beyond the side of the replace opening

as long as it is kept within the shaded area illustrated in Figure 6 on Page 8.

Top of Door Frame

Fireplace (right side)

* Insulation is NOT ALLOWED in the clearance zones around vent compo-

nents. Keep this area free from combustible materials.

Figure 44: Finished Wall

A hearth extension is not required with this appliance. If a hearth
extension is used, there are two methods of installation:

Combustible or noncombustible nish material may abut the front face

of the fireplace and the floor panel (see Figure 45).

Combustible or noncombustible nish material may be positioned
below the replace (see Figure 46). Remove the oor panel as shown
in Figure 45 by removing the screws on the right side of the panel
and sliding the left side away from the tab. Discard the screws and

floor panel.

Figure 45: Hearth Extension

NOTE: There must be least a 1/8 in. gap between the bottom of the
door track and the surface of the finish material.

26

Figure 46: Hearth Extension Profile

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

Step 12. INSTALLER INSTRUCTIONS—ATTACHING SAFETY-IN-OPERATION WARNINGS
It is the installers responsibility to ensure these warnings are properly affixed during installation. These warning labels are a

critical step in informing consumers of safe operation of this appliance.

ATTACHING SAFETY-IN-OPERATION
WARNINGS

It is required that the set of safety instruction
labels that have been furnished with the replace
be afxed to the operation and control points of
the replace. A safety instruction label must be
afxed to the receiver wall switch plate where the

fireplace is turned on and off (See Figure A) and
on the remote control handheld transmitter (See

Figure B). To properly complete the installation
of this replace, locate the multi-lingual adhesive
labels provided with the Care and Operation
Instructions and proceed as follows:

1. Locate the wall receiver that controls the
fireplace (verify the switch operates the

replace by turning it on and off). Clean the

wall receiver plate thoroughly to remove any

dust and oils. Afx the label to the surface of

the plate of the wall receiver that controls the
fireplace (Figure A). Choose the language

primarily spoken in the home. If unknown,
afx the English language label.

2. Locate the remote control transmitter and
clean it thoroughly to remove any dust and

oils. Afx the label to the surface of handheld
transmitter (Figure B). Choose the language
primarily spoken in the home. If unknown,
afx the English language label.

3. If you are unable to locate the labels, please
call Lennox Hearth Products or your nearest
Lennox Hearth Products dealer to receive
additional safety instruction labels free of

charge.

Cat. No. H8024 Replacement Label Kit

LENNOX HEARTH PRODUCTS
1-800-655-2008

NOTE: English is red text on clear label. French
and Spanish are white text on black label.

SAFETY LABEL

DIAGRAMS

APPOSITION DES MISES EN GARDE RELATIVES
À LA SÉCURITÉ D’UTILISATION

Il est impératif que le jeu d’étiquettes de sécurité qui

ont été fournies avec le foyer soient collées à côté

des dispositifs de contrôle du foyer. Une étiquette de
sécurité doit être collée sur la plaque du récepteur
mural contrôlant l’allumage du foyer (voir Figure A)
et sur le boîtier de la télécommande (Figure B). Pour
achever l’installation correcte de ce foyer, procédez
comme suit avec les étiquettes adhésives en langues

étrangères fournies avec les instructions d’utilisation

et d’entretien :

1. Repérez le récepteur mural qui contrôle le foyer
(vériez que l’interrupteur contrôle le fonction ­nement du foyer en le faisant basculer de Marche
à Arrêt, et vice-versa). Nettoyez soigneusement
la plaque du récepteur mural pour éliminer la

poussière et les traces de graisse ou d’huile.

Collez l’étiquette sur la surface de la plaque du
récepteur mural qui contrôle le foyer (Figure A).
Choisissez la langue qui est principalement parlée

dans la résidence du propriétaire. En cas de

doute, collez l’étiquette en anglais.

2. Repérez la télécommande et nettoyez-la
soigneuse ment pour éliminer la poussière et les

traces de graisse ou d’huile. Collez l’étiquette
sur le boîtier de la télécommande (Figure B).
Choisissez la langue qui est principalement parlée

dans la résidence du propriétaire. En cas de

doute, collez l’étiquette en anglais.

3. Si vous ne trouvez pas les étiquettes, veuillez
appeler Lennox Hearth Products ou votre
distributeur Lennox Hearth Products local
pour recevoir gratuitement des étiquettes

supplémentaires.

Étiquettes de remplacement, n° cat. H8024

LENNOX HEARTH PRODUCTS
1-800-655-2008

Remarque : Le texte anglais est rouge sur un support
transparent. Le texte français et espagnol est blanc
sur un support noir.

DIAGRAMMES DES ÉTIQUETTES

DE SÉCURITÉ

COLOCACIÓN DE ADVERTENCIAS DE
SEGURIDAD EN OPERACIÓN

Se requiere que el juego de etiquetas de
instrucciones de seguridad que se incluyeron con la
chimenea se coloque en los puntos de operación y
control de la misma. Se debe colocar una etiqueta

de instrucciones de seguridad en la placa del
interruptor de pared del receptor desde el cual se
enciende y se apaga la chimenea (ver la Figura A) y
en el transmisor de control remoto (ver la Figura B).
Para completar correctamente la instalación de

esta chimenea, encuentre las etiquetas adhesivas

multilingües incluidas con las instrucciones de

cuidado y operación y haga lo siguiente:

1. Identique el receptor de pared que controla la
chimenea (verique que el interruptor opera la
chimenea encendiéndola y apagándola). Limpie
bien la placa del receptor de pared para quitar el
polvo y aceite. Pegue la etiqueta en la supercie
de la placa del receptor de pared que controla la
chimenea (Figura A). Seleccione el idioma que
más se habla en la casa. Si no sabe cuál es, use la
etiqueta en inglés.

2. Identique el transmisor de control remoto
y límpielo bien para quitar el polvo y aceite.
Pegue la etiqueta en la supercie del transmisor
(Figura B). Seleccione el idioma que más se habla
en la casa. Si no sabe cuál es, use la etiqueta

en inglés.

3. Si no puede encontrar las etiquetas, sírvase
llamar a Lennox Hearth Products o al distribuidor
de Lennox Hearth Products más cercano para
recibir etiquetas de instrucciones de seguridad

adicionales gratuitas.

Juego de etiquetas de repuesto - Nº de cat. H8024

LENNOX HEARTH PRODUCTS
1-800-655-2008

Nota: La etiqueta en inglés es transparente con texto
rojo. Las etiquetas en francés y español son negras
con texto blanco.

DIAGRAMAS DE ETIQUETAS

DE SEGURIDAD

Figure A

Remote

PRG

On

Figure B

Off

27

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LENNOX HEARTH PRODUCTS • MONTEBELLO® POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS

INSTALLATION ACCESSORIES

Listed Secure Vent® Components

Cat. No. Model No. Description

77L70 SV4.5L6

77L71 SV4.5L12

77L72 SV4.5L24

77L73 SV4.5L36

77L74 SV4.5L48

77L75 SV4.5LA

77L76 SV4.5E45

77L77 SV4.5E90

H2246 SV4.5HF

H2247 SV4.5VF

The following ashings come packaged with a storm collar:

H5816 SV4.5-TWSK

6 in. (152mm)
Vent Section

12 in. (305mm)
Vent Section

24 in. (610mm)
Vent Section

36 in. (914mm)
Vent Section

48 in. (1219mm)
Vent Section

Telescopic Section

45 Degree Elbow

90 Degree Elbow

Firestop/Spacer,
Horizontal
(3 - 1 - 1 spacing)
10 pack

Firestop/Spacer,
Vertical
(1 - 1 - 1 spacing)
10 pack

Through Wall
Shield Kit
(used to shield the
direct-vent pipe from
blown insulation)
Ref. instr. # 750247M

Listed Secure Vent / Secure Flex® Components

Cat. No. Model No. Description

Attic Insulation Shield

H3907 SV4.5RSA

H7748 FVK36

10K81 SFMP

89L40 SFMP-12

91L66 SF-GC4-6

91L67 SF-GC7-6

(adjustable 12 in.
to 22 in.)

36 in. Flex Vent Kit

Note: Flex attaches to
appliance collar at one
end and to rigid venting at
the other end.

Mill-Pac, Black, High
Temperature Sealant

Mill-Pac, Black,
High Temperature
Sealant—Bulk 12 pack

Gear Clamp 4.5 in.
(114 mm) for flex
(6 pieces)

Gear Clamp 7.5 in.
(190.5 mm) for flex
(6 pieces)

96K93 SV4.5SU

96K92 SV4.5SP

Lennox Hearth Products reserves the right to make changes at any time, without notice, in design,
materials, specications, prices and also to discontinue colors, styles and products.
Consult your local distributor for replace code information.

LENNOX®, the LENNOX design, DAVE LENNOX, the image of DAVE LENNOX and other related

LENNOX marks are registered or common law trademarks of Lennox Industries Inc. and are used

with permission.

Printed in U.S.A. © 2012 Lennox Hearth Products LLC

P/N 506023-16 Rev. NC 08/2012

28

Support Strap

Support Plate

1508 Elm Hill Pike, Suite 108 • Nashville, TN 37210