Lennox LMDV-3530-CNE, LMDV-40, LMDV-4035-CPM, LMDVR-3328-CNM, LMDVT-3328-CNM User Manual

INSTALLATION

US

INSTRUCTIONS

This appliance may be installed in an aftermarket
permanently located, manufactured home (USA
only) or mobile home, where not prohibited by
local codes. This appliance is only for use with
the type of gas indicated on the rating plate. This
appliance is not convertible for use with other
gases, unless a certified kit is used.

In the Commonwealth of Massachusetts:

• Installation must be performed by a licensed plumber or

gas fitter;

• See Table of Contents for location of additional Com­monwealth of Massachusetts requirements.

WARNING: IF THE INFORMATION IN THIS MANUAL
IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLO­SION MAY RESULT CAUSING PROPERTY DAMAGE,
PERSONAL INJURY OR LOSS OF LIFE.

Do not store or use gasoline or other flammable
vapors or liquids in the vicinity of this or any
other appliance.

DIRECT VENT MERIT

™

LMDV-33/35/40 SERIES

VENTED GAS FIREPLACE HEATERS - DIRECT VENT MODELS

P/N 850,029M REV. G 05/2008

MODELS

Millivolt Models

LMDVT-3328-CNM
LMDVT-3328-CPM
LMDVR-3328-CNM
LMDVR-3328-CPM

LMDV-3530-CNM
LMDV-3530-CPM
LMDV-4035-CNM
LMDV-4035-CPM

INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.

AVERTISSEMENT: ASSUREZ-VOUS DE BIEN
SUIVRE LES INSTRUCTIONS DONNÉ DANS CETTE
NOTICE POUR RÉDUIRE AU MINIMUM LE RISQUE
D'INCENDIE OU POUR ÉVITER TOUT DOMMAGE
MATÉRIEL, TOUTE BLESSURE OU LA MORT.

Electronic Models

LMDVT-3328-CNE
LMDVR-3328-CNE
LMDV-3530-CNE
LMDV-4035-CNE

WHAT TO DO IF YOU SMELL GAS:

• Do not 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 your gas supplier's

instructions.

• If your gas supplier cannot be reached, call
the fire department.

Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.

OTL Report No. 116-F-31-5

A French manual is available upon request. Order P/N 850,029CF

Ce manuel d’installation est disponible en francais, simplement en
faire la demande. Numéro de la pièce 850,029CF.

POUR VOTRE SÉCURITÉ: Ne pas entreposer ni
utiliser d'essence ni d'autre vapeurs ou liquides
inflammables dans le voisinage de cet appareil ou

de tout autre appareil.
POUR VOTRE SÉCURITÉ: Que faire si vous sentez

une odeur de gaz:

• Ne pas tenter d'allumer d'appareil.

• Ne touchez à aucun interrupteur. Ne pas vous
servir des téléphones se trouvant dans le bati­ment où vous vous trouvez.

• Evacuez la piéce, le bâtiment ou la zone.

• 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 dos incendies.

L'installation et service doit être exécuté par un
qualifié installeur, agence de service ou le fournis­seur de gaz.

TABLE OF CONTENTS

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

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

General Information ..........................

New York City Approval .....................

Requirements for the
Commonwealth of Massachusetts .

Cold Climate Insulation .....................

Location ............................................Page 4

Manufactured Home Requirements ..

Vent Termination Clearances ............

Appliance and Vent Clearances .........

Detailed Installation Steps .................

Typical Installation Sequence ...........

Step 1. Framing .................................

Step 2. Routing Gas Line ..................

Fireplace Specifications .....................

Step 3. Install the Venting System ....

Vertical Termination Systems ............

Vent Section Length Chart ................

Vertical Vent Tables and Figures ........

Horizontal Termination System .........

Horizontal Vent Tables and Figures ...

Venting Using Flexible Vent Pipe .......

Step 4. Field Wiring .........................

Step 5. Optional Blower Kit Wiring ..

Step 6. Connecting Gas Line ...........

Step 7. Checking Unit Operation .....

Step 8. Installing Logs ...................

Step 9. Installing Glass Door ..........

Step 10. Burner Adjustments ............

Step 11. Hood Installation .................

Finishing Requirements ....................

Installation Accessories ....................

Gas Conversion Kits .................. Page 34

This manual is part of a set of two supporting
this product. Refer to manual 875,028M for
Care & Operation information.

Please read and understand these
instructions before beginning your

installation.

The Millivolt appliances have a millivolt gas
control valve with piezo ignition system which
provides safe, efficient operation. If any optional
accessories that will require electrical power
are to be installed, the electrical power must be
provided at the time of appliance installation.

The

Electronic appliances have an electronic
intermittent pilot ignition system which provides
safe, efficient operation. External electrical pow
er is required to operate these appliances.

2

Page 2
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Page 4
Page 4

Page 5
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Page 7
Page 8
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Page 9
Page 11
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Page 16
Page 19
Page 22
Page 23
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Page 24
Page 25
Page 26
Page 29
Page 29
Page 30
Page 30
Page 31

PACKAGING

The assembled vented gas fireplace heater is
packaged with:

One log set located in firebox area.

1 -

One envelope containing the literature pack-

2 -

age which consists of the homeowner's
manual, installation instructions, and war
ranty; envelope is located in the control
compartment.

One vent restrictor to be applied as shown on

3 -

Page 11 ; restrictor is taped to the envelope.

One hood located behind the top panel.

4 -

One bag of decorative volcanic stone located

5 -

in the control compartment.

One bag of glowing embers located in the

6 -

control compartment.

One bag of vermiculite located in the control

7 -

compartment.

INTRODUCTION

These vented gas fireplace heaters are sealed
combustion, air circulating gas fireplaces de
signed for residential applications.

Approved Vent Components - These fireplaces
are designed, tested and listed for operation
and installation with, the following vent com
ponents only:

• Secure Vent™ Direct Vent System Compo-
nents,

• Secure Flex™ Flexible Vent Components
manufactured by Security Chimneys Inter
national and

• Z-FLEX™ Model GA Venting Systems listed
to UL1777 and ULCS635 manufactured by
Flexmaster Canada Limited.

These approved vent system components are
labeled for identification. DO NOT use any other
manufacturer’s vent components with these
appliances. Use only the correct size venting
(4-1/2" inner & 7-1/2" outer).

These appliances comply with National Safety
Standards and are tested and listed by OMNI­Test Laboratories, Inc. (Report No. 116-F-31-5)
to ANSI Z21.88b (in Canada, CSA-2.33b), and
CAN/CGA-2.17-M91 in both USA and Canada,
as vented gas fireplace heaters.

Both millivolt and electronic versions of
these appliances are listed by OMNI-Test
Laboratories for installation in bedrooms
and Manufactured Homes.

Manufactured Homes -

Manufactured Home Requirements on

See
Page 5 for additional information.

-

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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

This appliance is only for use with the type
of gas indicated on the rating plate. This ap­pliance is not convertible for use with other
gases, unless a certified kit is used.

Cet appareil doit être utilisé uniquement
avec les types de gaz indiqués sur la plaque

-

signalétique. Ne pas l'utiliser avec d'autres
gaz sauf si un kit de conversion certifié est
installé.

Misc. Codes / Standards -

Installation must conform to local codes. In the
absence of local codes, installation must comply
with the current National Fuel Gas Code, ANSI
Z223.1. (In Canada, the current CAN-1 B149
installation code).

The appliance, when installed, must be elec
trically grounded & wired in accordance with
local codes or, in the absence of local codes,
with the National Electrical Code, ANSI / NFPA
70-latest edition, or the Canadian Electrical

-

Code, CSA C22.1 - latest edition.

GENERAL INFORMATION

Note: Installation and repair should be per-

-

formed by a qualified service person. The
appliance should be inspected annually by a
qualified professional service technician. More
frequent inspections and cleanings may be
required due to excessive lint from carpeting,

-

bedding material, etc.

S'assurer que le brùleur et le compartiment des
commandes sont propres. Voir les instructions
d'installation et d'utilisation qui accompagnent
l'appareil.

Provide adequate clearances around air open
ings and adequate accessibility clearance for
service and proper operation. Never obstruct
the front openings of the appliance.

These appliances are designed to operate on
natural or propane gas only. The use of other
fuels or combination of fuels will degrade
the performance of this system and may be
dangerous.

These fireplaces are designed as supplemen
tal heaters. Therefore, it is advisable to have
an alternate heat source when installed in a
dwelling.

Millivolt Models - The millivolt appliances are
manually controlled and feature a spark igniter
(piezo) that allows the appliance's pilot gas to
be lit without the use of matches or batteries.
This system provides continued service in the
event of a power outage.

Millivolt models come standard with a manu
ally-modulated gas valve; flame appearance and
heat output can be controlled at the gas valve.
The BTU Input for these appliances is shown

Tables 1 & 2.

in

-

-

-

-

F

F

O

N
I

P

S

I

NO

L

O

R

T

N

O

C

G

I
N
T

I
ER

O

N

O

F

F

P

I

L

O

T

L

O

H

I

Input (BTU) Manually-Modulated Gas

H

I

L

O

W

H

TPT

HT

P

T

P

I

L

O

T

P

I

L

O

T

O

N

it

O

F

F

IN

OUT

Valves (millivolt models)

NATURAL GAS

Models Input Rate (BTU / HR)

LMDVT-3328CNM
LMDVR-3328CNM

LMDV-3530CNM

LMDV-4035CNM

17,500 high

11,700 low

20,000 high

12,800 low

27,000 high

18,500 low

Table 1

Input (BTU) Manually-Modulated Gas

Valves (millivolt models)

PROPANE GAS

Models Input Rate (BTU / HR)

LMDVT-3328CPM
LMDVR-3328CPM

LMDV-3530CPM

LMDV-4035CPM

17,500 high

14,000 low

20,000 high

15,200 low

27,000 high

21,500 low

Table 2

Electronic Models -

Electronic models have a fixed rate gas valve.
Input of electronic models is shown in Table 3.

Electronic Models with Fixed Rate Gas Valve

Natural and Propane Gas

Model Series Input Rate

(BTU / HR)

LMDVT-3328
LMDVR-3328

17,500

LMDV-3530 20,000
LMDV-4035 27,000

Table 3

Manifold Gas Supply Pressure

(millivolt models)

Fuel # Low High

Natural

Gas

Propane

(Lo) 2.2" WC

(.55 kPa)

(Lo) 6.3" WC

(1.57 kPa)

(Hi) 3.5" WC

(.87 kPa)

(Hi) 10.0" WC

(2.49 kPa)

Table 5

Manifold Gas Supply Pressure

(electronic models)

Fuel # Maximum Manifold Pressure

Natural Gas (Hi) 3.5" WC (.87 kPa)

Propane (Hi) 10.0" WC (2.49 kPa)

Table 6

Test gauge connections are provided on the
front of the millivolt gas control valve, identi
fied IN for the inlet and OUT for the manifold
side. A 1/8" NPT Test gauge connection
is provided at the inlet and outlet side of
the electronic gas control valve.

These appliances must be isolated from the
gas supply piping system (

by closing their

individual manual shut-off valve) during any

pressure testing of the gas supply piping
system at test pressures equal to or

less than

1/2 psig (3.5 kPa).
These appliances and their individual shut-off

must be disconnected from the gas

valves
supply piping system during any pressure
testing of that system at pressures

greater

than 1/2 psig (3.5 kPa).

Orifice Sizes - Sea Level to High Altitude
(All Models)

These appliances are tested and approved for
installation at elevations of 0-4500 feet (0-1372
meters) above sea level using the standard burner
orifice sizes (marked with an "*" in

Table 7). For

elevations above 4500 feet, contact your gas

Install the appliance according to the regulations
of the local authorities having jurisdiction and,
in the USA, the National Fuel Gas Code NFPA 54
/ ANSI Z223.1 - latest edition or, in Canada, the
CAN1-B149.1 and .2 codes - latest edition.

Gas Valve Diagrams

Figures 1 & 2 for Millivolt models and

See

Figure 3 For Electronic Models.

SIT Millivolt Gas Valve

-

HI/LO Variable
Flame Height
Adjustment

Pilot Adjustment
Screw

Manifold Pressure Tap

Inlet Pressure Tap

Main Gas

Control Knob

OFF/PILOT/ON

Figure 1

Honeywell Millivolt Gas Valve

PIEZO
IGNITER

PILOT
ADJUSTMENT
SCREW

TP/TH

TP

TH

WIRING
TERM­INALS

GAS CONTROL
KNOB

INLET
PRESSURE
TAP

CONVERTIBLE
HI/LO REGULATOR
(adjusts flame height
and heat output)

Figure 2

OUTLET
PRESSURE
TAP

supplier or qualified service technician .

Gas Pressure - All Models

Tables 4, 5 and 6 show the appliances' gas
pressure requirements:

Inlet Gas Supply Pressure

(all models)

Fuel # Minimum Maximum

Natural Gas

Propane

Table 4

5.0" WC

(1.24 kPa)

11.0" WC

(2.74 kPa)

10.5" WC

(2.61 kPa)

13.0" WC

(3.23 kPa)

Model

Series

LMDVT-3328
LMDVR-3328

LMDV-3530

LMDV-4035

Table 7

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Burner Orifice Sizes

Elevation 0-4500 feet ( 0-1372 meters)

Nat.Gas

drill size (inches)

#45 (.082")

39L66 •

#44 (.086")

60J8001 •

#37 (.104")

24M1001 •

* Standard size installed at factory

• Part /Cat. Number

*

*

*

Propane

drill size (inches)

(.048")
99K780 •

#55 (.052")

19L5201 •

1/16" (.062")

21L0101 •

*

*

*

Honeywell Electronic Gas Valve

Manifold Pressure
Port

ON / OFF Switch

Inlet
Pressure
Port

Figure 3

Electronic
Gas
Control
Valve

3

Massachusetts And New York City, NY Re-

N

O

I

T

A

C

I

L

P

P

A

T

N

E

V

R

A

E

R

N

O

I

T

A

C

IL

P

P

A

T

N

E

V

P

O

T

APPLICATION

TOP VENT

TNEV RAE

R

NOITAC

I
LPPA

TNEV

P
OT

NO
I

T
A
CILP

PA

RECESSED

INSTALLATION

TOP VENT

APPLICATION

NOITACILPPA
TN
E

V POT

NOITACILPPA
TNEV POT

(Rear Vent

VERTICAL VENT

Application)

(Rear Vent Application

HORIZONTAL VENT

without a chase)

HORIZONTAL VENT
(Rear Vent Application
With a chase)

VERTICAL VENT
(Top Vent
Application)

HORIZONTAL VENT
(Top Vent
Application)

quirements

These appliances are approved for installation
in the following USA locations listed in the
following:

Massachusetts:

These fireplaces are approved for installation in
the US state of Massachusetts if the following
additional requirements are met-

• Installation and repair must be done by a
plumber or gas fitter licensed in the Common
wealth of Massachusetts.

• The flexible gas line connector used shall not
exceed 36 inches (92 centimeters) in length.

• The individual manual shut-off must be a
T-handle type valve.

Massachusetts Horizontal Vent Requirements

In the Commonwealth of Massachusetts, hori­zontal terminations installed less than seven
(7) feet above the finished grade must comply
with the following additional requirements:

• A hard wired carbon monoxide detector with
an alarm and battery back-up must be installed
on the floor level where the gas fireplace is
installed. The carbon monoxide detector must
comply with NFPA 720, be ANSI/UL 2034 listed
and be ISA certified.

• A metal or plastic identification 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 4 - Typical Locations

New York City, NY:

These fireplaces are approved for installation in
New York City in the US state of New York.

COLD CLIMATE INSULATION

For cold climate installations, seal all cracks
around the appliance with noncombustible
material and wherever cold air could enter
the room. It is especially important to insulate
outside chase cavity between studs and under
floor on which the appliance rests, if floor is
above ground level. Gas line holes and other
openings should be caulked or stuffed with
unfaced fiberglass insulation. If the fireplace
is being installed on a cement slab, in cold
climates, a sheet of plywood or other raised
platform can be placed underneath to prevent
conducting cold up into the room. It also helps to
sheetrock inside surfaces and tape for maximum
air tightness and caulk firestops.

4

LOCATION

To provide for the lowest possible shelf surface
use the alternate rear vent outlet with attached

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.
Consideration should be given to traffic ways,
furniture, draperies, etc., due to elevated surface
temperatures (Figure 4). The location should
also be free of electrical, plumbing or other

venting routed in a way to minimize obstructions
to the use of the space above the appliance.

Do
not insulate the space between the appliance
and the area above it. See Figure 9. The mini-

mum height from the base of the appliance to
the underside of combustible materials used to
construct a utility shelf in this fashion is shown
in the Table in Figure 9.

heating/air conditioning ducting.

The appliance should be mounted on a fully

These direct vent appliances are uniquely
suited for installations requiring a utility shelf
positioned directly above the fireplace. Utility
shelves like these are commonly used for locat­ing television sets and decorative plants. Be

aware that this is a heat producing appliance.
Objects placed above the unit are exposed to
elevated temperatures.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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, etc., a metal or
wood barrier covering the entire bottom surface
must be used.

12

X

Roof Pitch is X/12

2 FT
MIN.

2 FT MIN.

Lowest

Discharge

Opening

H*

*H = MINIMUM HEIGHT FROM ROOF TO

LOWEST DISCHARGE OPENING OF VENT

TERMINATION HEIGHTS FOR VENTS ABOVE

FLAT OR SLOPED ROOFS

Horizontal Overhang

Vertical
Wall

Vent

Termination

Storm Collar

Concentric

Vent Pipe

Flashing

1 inch (25.4 mm) Minimum
Clearance to Combustibles

MANUFACTURED HOME

3"

(76 mm)

12"

(305 mm)

Combustible Projection greater

Horizontal Vent Termination Clearances

Combustible Projection

2-1/2 inches or less in length

18"

(457 mm)

Ventilated

Soffit

Unventilated

Soffit

than 2-1/2 inches in length

Termination Kit

Side Elevation View

Termination Kit

All horizontal terminations
may be located as close as
6” (152mm) to any
(non-combustible and
combustible) exterior
sidewall. This distance
may be decreased to 2”
(51mm) for non-­combustible exterior
sidewalls only, if the
SV4.5HT-2 termination
is used.

REQUIREMENTS

This appliance may be installed in an after­market permanently located, manufactured
home (USA only) or mobile home, where not
prohibited by local codes.

Cet appareil peut être installé dans un maison

préfabriquée (É.-U. seulement) ou mobile déjà

installée à demeure si les réglements locaux

le permettent.

Manufactured Home installations must be
installed in accordance with these instructions
and the following standards / codes:

• Manufactured Home Construction and
Safety Standard Title 24 CFR, Part 3280, or

the current Standard for Fire Safety Criteria
for Manufactured Home Installations, Sites
and Communities ANSI / NFPA 501A in the
USA, and CAN / CSA Z240 MH Mobile Home
Standard in Canada

• (when applicable) The American National

Standard for Manufactured Homes (NCSBCS
/ ANSI A225.1 - latest edition).

CAUTIONS

Vertical Vent Termination Clearances

The vent / air intake termination clearances
above the high side of an angled roof is as
shown in the following chart:

Figure 5

Termination Heights For Vents

Above Flat Or Sloped Roofs

Ref. NFPA 54 / ANSI Z223.1, 7.6

Roof Pitch * Feet * Meters

Flat to 6/12
6/12 to 7/12
7/12 to 8/12
8/12 to 9/12

9/12 to 10/12
10/12 to 11/12
11/12 to 12/12
12/12 to 14/12
14/12 to 16/12
16/12 to 18/12
18/12 to 20/12
20/12 to 21/12

1.0 0.3

1.25 0.38

1.5 0.46

2.0 0.61

2.5 0.76

3.25 0.99

4.0 1.22

5.0 1.52

6.0 1.83

7.0 2.13

7.5 2.29

8.0 2.44

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.

This appliance must be grounded
to the chassis of the manufac­tured home in accordance with
local codes or in the absence of
local codes, with the National
Electrical Code ANSI / NFPA 70

- latest edition or the Canadian
Electrical Code CSA C22.1 - latest
edition.

VENT TERMINATION CLEARANCES

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

-B149.2 in Canada.

Terminate multiple vent terminations according to
the installation codes listed above.

Terminate single vent caps relative to building
components according to

Figure 5.

Figure 6

Note - See Figure 35 on Page 20 for the exterior wall recess
allowances of the square horizontal termination.

Horizontal Vent Termination Clearances

The horizontal vent termination must have a minimum of 3" (76 mm) clearance to any overhead
combustible projection of 2 1/2" (64 mm) or less. See
(64 mm), see

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Figure 6. For additional vent location restrictions refer to Figure 7 on Page 8.

Figure 6. For projections exceeding 2 1/2"

5

EXTERIOR HORIZONTAL VENT TERMINATION CLEARANCE REQUIREMENTS

V

V

V

V

V

F

C

Fixed

Closed

Window

Operable

Window

B

B

A

B

H

M

I

= Area where Terminal is not Permitted

= Air Supply Inlet

X

= Vent Terminal

V

D

V

3 ft.

3 ft.

A

A

A

= 9” in U.S.
= 12” in Canada

V

L

B

J

X

V

A

G

Inside

Corner Detail

B

C

C

C

*18”

Ventilated Soffit

Horizontal
Termination

Detail D

Exterior Wall

Center Line

of Termination

18”

Inside Corner

*

See Item D in the Text Below.

V

P

V

O

N

N

Q

NOTE: Local Codes Or Regulations
May Require Different Clearances.

NOTE: Location Of The Vent Termination
Must Not Interfere With Access To The
Electrical Service.

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6

Figure 7

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

MINIMUM CLEARANCES TO COMBUSTIBLES

4 (102)

2

(51)

4

(102)

6

(152)

8

(203)

10

(254)

12

(305)

6 (152)

10 (254)

14 (356)

12 (305)

8 (203)

5 (127)

8-1/4

14

(356)

12 (305)

19

(483)

Shelf Above Fireplace With Rear Venting

Do not insulate the
space between the

appliance and the

area above it.

Shelf Height

(see table)

*Shelf Height

(see table)

Do not insulate the
space between the

appliance and the

area above it.

Shelf Above Fireplace With Top Venting

Hearth Extension A hearth extension is not required with this appliance. If a hearth extension is
used, do not block the lower control compartment door. Any hearth extension used is for appearance
only and does not have to conform to standard hearth extension installation requirements.

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 front face. See Figure 61 on Page 30.

Non-combustible materials, such as surrounds and other appliance trim, may be installed on the
appliance front face with these exceptions: they must not cover any portion of the removable glass
panel or louvers.

Appliance and Vent Clearances

The appliance is approved with zero clearance to
combustible materials on all sides (as detailed in
Table 8), with the following exception: When the
unit is installed with one side flush with a wall, the
wall on the other side of the unit must not extend
beyond the front edge of the unit. In addition, when
the unit is recessed, the side walls surrounding
the unit must not extend beyond the front edge
of the unit. See Figure 4.

Vertical installation clearances to combustible mantels vary according to the depth of the mantel.
See Figure 8. Mantels constructed of non-combustible materials may be installed at any height
above the appliance opening; however, do not allow anything to hang below the hood.

Mantel Depth

Top of
Appliance

Note - Hood shown as positioned with louvered panels.

inches (millimeters)

Figure 8 - Minimum Mantel Clearances

Model No.

LMDVT-3328 *44-1/2 (1130) *46-1/4 (1175) N/A N/A

LMDVR-3328 N/A N/A 33-1/4 (845) 33-1/4 (845)

LMDV-3530 *46-1/2 (1181) *48-1/4 (1226) 35-1/4 (895) 35-1/4 (895)
LMDV-4035 *51-1/2 (1308) *53-1/4 (1349) 40-1/4 (1022) 40-1/4 (1022)

Top Vent - with One 90 Degree Elbow Rear Vent - Straight Out the Back

Secure Vent Secure Flex

(flex elbow)

Secure Vent Secure Flex

* Includes 3” clearance to combustibles (required above vent components)

Combustible Shelf Height - Inches (millimeters)

Minimum Distance to Unprotected Side Wall

Combustible materials may project beyond the sides of the fire­place opening as long as they are kept within the shaded areas
illustrated here.

At 14" minimum
side wall clearance,
a combustible wall
can project to any
length.

MINIMUM CLEARANCES Inches (millimeters)

Back 1/2 (13)

0 (0) Spacers

Sides 1/2 (13)

0 (0) Spacers

Top Spacers 0 (0)

Floor 0 (0)

Bottom of Appliance

To Ceiling

64 (1626)

Vent 3 (76) Top *

1 (25.4) Sides & Bottom

SERVICE CLEARANCES Feet (meters)

Front 3 ft. (0.9 m)

Table 8

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

**Note: See Page 8, Step 1 for clearance
requirements to the nailing flange located
at each side of the unit and any screw heads
adjacent to it.

At 8-1/4" side
wall clearance, a
combustible wall
can project 12"

o

45

Top View of

Fireplace

Combustible Materials
Allowed In Shaded Area
“Safe Zone”

Combustible Walls
shown in dark gray

Figure 9 -

Shelf Height Minimum Clearances

Inches (millimeters)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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.

Protected wall shown in white

Figure 10

7

Note: The nailing flanges, combustible members
and screw heads located in areas directly adjacent
to the nailing flanges, are EXEMPT from the 1/2”
clearance to combustible requirements for the
firebox outer wrapper

. Combustible framing may be

in

direct contact with the nailing flanges and may
be located closer than 1/2” from screw heads and
the firebox wrapper in areas adjacent to the nailing
flanges. Frame the opening to the exact dimensions
specified in the framing details of this manual.

Side

Framing

Unit Nailing Flange

(No clearance to

combustible

framing is required)

Left Side Front Corner of Fireplace Shown

(Right Side Requirements the Same)

Unit Being Secured By Its Nailing Flanges

To The Framing

DETAILED INSTALLATION STEPS

The appliance is shipped with all gas controls and
components installed and pre-wired. Remove
the shipping carton, exposing the front glass
door. Remove the top and bottom louvered
control panel per instructions on

Page 25 (see

Control Compartment Access / Louver Panel
Instructions). Remove the cardboard from

underneath the pressure relief plates (in area
behind top louver panel, See Figure 11). Open

the two latches (located under the firebox floor)
securing the glass door. Remove the door by
tilting it outward at the bottom and lifting it up.
Set the door aside protecting it from inadvertent
damage.

See Figure 57 on Page 29.

Pressure Relief Plates

REMOVE

CARDBOARD
BEFORE USING

Remove Cardboard Before
Using Appliance

Note: See-Through Model Shown

REMOVE

CARDBOARD
BEFORE USING

Figure 11

TYPICAL INSTALLATION SEQUENCE

The typical sequence of installation follows,
however, each installation is unique resulting
in variations to those described.

See the Page numbers references in the follow
ing steps for detailed procedures.

Step 1. (Page 8) Construct the appliance fram-

ing. Position the appliance within the framing
and secure with nailing brackets.

Step 2. (Page 8) Route gas supply line to ap-

pliance location.

Step 3. (Page 11) Install the vent system and

exterior termination.

Step 4. (Page 23) Field Wiring

a. Millivolt Appliances – Install the operating

control switch (not factory provided) and
bring in electrical service line for forced air
circulating blower (optional equipment).

b. Electronic Appliances – Field wire and

install operating control switch.

Step 5. (Page 23) Install blower kit (optional

equipment).

Step 6. (Page 24) Make connection to gas

supply.

Step 7. (Page 25) Install the logs, decorative

volcanic stone and glowing embers.

Step 8. (Page 26) Checkout appliance opera-

tion.

Step 9. (Page 29) Install glass door frame

assembly.

Step 10. (Page 29) Adjust burner to ensure

proper flame appearance.

Step 11. (Page 30) Install the hoods.

Step 1. FRAMING

Frame these appliances as illustrated in Figures
14 & 15 on Pages 9 & 10 (Figure 15 applies to

corner framing installations only). All framing
details must allow for a minimum clearance
to combustible framing members as shown in
Table 8 on Page 7.

If the appliance is to be elevated above floor
level, a solid continuous platform must be
constructed.

Headers may be in direct contact with the
appliance top spacers but must not be sup
ported by them or notched to fit around them.
All construction above the appliance must be
self supporting.

-

structural support.

The fireplace should be secured to the side
framing members using the unit's nailing

flanges - one top and bottom on each side of
the fireplace front. See

or their equivalent.

DO NOT use the appliance for

Figure 12. Use 8d nails

Figure 12

Step 2. ROUTING GAS LINE

Route a 1/2" (13 mm) gas line along the inside
of the right side framing as shown in Figure

13. Gas lines must be routed, constructed and
made of materials that are in strict accordance
with local codes and regulations. All appliances
are factory-equipped with a flexible gas line
connector and 1/2 inch shutoff valve. (See

Step 6 on Page 24 ).

Right Side Front

-

Corner of Fire­place Framing

6 1/2"

(152 mm)

Also see Figure 14.

Figure 13 - ROUTE GAS LINE

3"

(76 mm)

8

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Continued on

Page 10.

FIREPLACE SPECIFICATIONS

.oNledoM A B C D E F** G H J K L M N

.ni 8/133 8/103 71 2/172 8/133 8/591 2/112 4/301 61/316 3

mm 148 567 234 996 148 894 645 372 371 67 212 07 033

.ni 8/153 8/123 91 2/192 8/153 61/1112 8/742 1 61/72 9 3 9 3 61

mm 298 618 384 947 298 155 236 613 022 67 022 67 604
.ni 8/104 8/173 42 2/143 8/104 61/1162 8/792 1 61/514 9 3 9 3 61
mm 9101 349 016 678 9101 876 957 973 022 67 022 67 604

LMDVT-3328

LMDVR-3328

LMDV-3530

LMDV-4035

132 3/4

8 11/32

A

B

D

7

(178)

5-1/8

12-1/8

(308)

10-1/2

(

267

)

C

VENT FRAMING ­TOP VENT WITH ONE
90ϒ ELBOW

VENT FRAMING ­REAR VENT WITH
NO ELBOWS

** Framing should be constructed

of 2x4 or larger lumber

Inches (mm)

E

(130)

(130)

7

(308)

(178)

E is the required framing depth dimension when the

finish material (drywall) thickness is 1/2 in. (13mm).

A

**FRAMING WITH SQUARE HORIZONTAL TERMINATIONS (SV4.5HT-2)

5-1/8

12-1/8

1/2

G

E

F**

H

N

1-5/8

(42)

L

K

Top View

NOTE - Eyebrow
hood shown as positioned
in louvered front model.

*CONCENTRIC FLUE

FLUE - 4-1/2 (114)
COMBUSTION AIR - 7-1/2 (190)

GAS INLET
(Either Side
and bottom)

* LMDV models have a top and rear vent

Front View

(Louvered Front Model Shown)

ELECTRICAL

INLET

2-3/4

x 2 (70 x 51)

COVER PLATE with

KNOCKOUT)

Right Side View

LMDVR models have only a rear vent
LMDVT models have only a top vent

J

M

**Note 1 - Collars protrude one inch on LMDVR-3328 model.

**See Note 1

** See Note 1

6 (152)

1-3/8 (35)

OPTIONAL ELECTRICAL

INLET KNOCKOUT,

REQUIRING A FIELD

PROVIDED JUNCTION BOX

(Either Side)

D

C

B

3 (76)

FRAMING SPACERS (Top & Sides & Rear)

1/2 (13)

A

Framing

Framing Dimensions

Model No. A B C D E

LMDVT-3328

LMDVR-3328

LMDV-3530

LMDV-4035

Models P4 Steady

LMDVT-3328 45 64 62 49 66 64

LMDVR-3328 53 63 61 55 66 64
LMDV-3530 53 64 62 55 62 60

LMDV-4035 59 69 67 60 69 67

in. 33-1/4 33-1/4 ------ 37-3/4 12-7/8

mm 845 845 ------ 959 327

in. 33-1/4 33-1/4 19-5/8 ------ 12-7/8

mm 845 845 498 ------ 327

in. 35-1/4 35-1/4 21-11/16 39-3/4 16

mm 895 895 551 1010 406

in. 40-1/4 40-1/4 26-11/16 44-3/4 16

mm 1022 1022 678 1137 406

Efficiencies %

Natural Gas Propane

State

AFUE P4 Steady

State

AFUE

Notes

* The Steady State Efficiency numbers based on
maximum vent configuration.

Due to Lennox' ongoing commitment to quality, all
specifications, ratings and dimensions are subject
to change without notice.

Vent Size

Co-axial DV

Vent Size

4-1/2" Inner

/ 7-1/2" Outer

Input (BTU) - MV & Electronic

Natural & Propane Gas

Models Input Rate (BTU / HR)

LMDVT-3328CPM
LMDVR-3328CPM

LMDV-3530CPM 20,000
LMDV-4035CPM 27,000

17,500

Vertical Venting Through the Ceiling:

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" x 10-1/2" (267
mm x 267 mm) inside dimensions, about
this center mark

(see Figure 25).

Figure 14

9

C

Back wall of chase/enclosure
(including any finishing materials)

a

Inches

(millimeters)

LMDV and LMDVR units

D

E

F

A

B

LMDV and LMDVT units

7 1/4 (184)

b

FIREPLACE FRAMING SPECIFICATIONS

.oNledoM A B C D E F

.ni 8/133 2/184 61/543 61/371 4/142 5

mm 148 2321 278 734 616 721

.ni 8/153 2/175 8/504 61/391 4/382 8/16

mm 298 1641 2301 784 037 651

.ni 8/104 61/316 23/1134 61/391 61/1103 8/77

mm 9101 4551 1011 784 977 002

LMDVT-3328

LMDVR-3328

LMDV-3530

LMDV-4035

Note­Venting requirments for rear vent applications in corner installations -

• The horizontal vent length "a" to "b" must not exceed 28 inches (711 mm).

LMDVT-3328 and LMDVR-3328 Models ­Dimension A to F occur when one 45 degree elbow is connected directly to the
appliance collar.

LMDVT-3530 and LMDVR-4035 Models ­Dimension D and F occur when one 45 degree elbow is connected directly to the
appliance collar.

Figure 15 - Corner Framing with Square Termination (SV4.5HT-2)

Proper Sizing of Gas Line

Properly size and route the gas supply line
from the supply regulator to the area where
the appliance is to be installed per require
ments outlined in the National Fuel Gas Code,
NFPA 54 - latest edition (USA) or B149 - latest
edition (Canada).

Never use galvanized or plastic pipe. Refer
to
ply line, if black iron pipe is being used. Gas
lines must be routed, constructed and made
of materials that are in strict accordance with
local codes and regulations. We recommend
that a qualified individual such as a plumber or
gas fitter be hired to correctly size and route
the gas supply line to the appliance. Installing
a gas supply line from the fuel supply to the
appliance involves numerous considerations of
materials, protection, sizing, locations, controls,
pressure, sediment, and more. Certainly no one
unfamiliar and unqualified should attempt sizing
or installing gas piping.

10

-

Table 9 for proper sizing of the gas sup-

Schedule 40

Black Iron Pipe

Inside Diameter (Inches)

Schedule 40 Pipe

Length (feet)

Natural

Gas

Propane

Gas

0-10 1/2 3/8

10-40 1/2 1/2

40-100 1/2 1/2
100-150 3/4 1/2
150-200 3/4 1/2

Table 9

Notes:

• All appliances are factory-equipped with a
flexible gas line connector and 1/2 inch shutoff
valve (see

• See
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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Figure 48 on Page 24 ).

Massachusetts Requirements on Page 4

Step 6 (Page 24 ).

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

Ensure propane

resistant compounds are used in propane
applications. Be very careful that the pipe
compound does not get inside the pipe.

• It is recommended to install a sediment trap
in the supply line as close as possible to the
appliance (see

Figure 48 ). Appliances using
Propane should have a sediment trap at the
base of the tank.

• Check with local building official for local code
requirements (i.e. are below grade penetrations
of the gas line allowed?, etc).

IMPORTANT: If propane is used, be aware that
if tank size is too small (i.e. under 100-lbs, if
this is the only gas appliance in the dwelling.
Ref. NPFA 58), there may be loss of pressure,
resulting in insufficient fuel delivery (which
can result in sooting, severe delayed ignition
or other malfunctions). Any damage resulting
from an improper installation, such as this, is
not covered under the limited warranty.

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 vent according to local codes,
these instructions, the current National Fuel
Gas Code (ANSI-Z223.1) in the USA or the
current standards of CAN/CGA-B149.1 and

-B149.2 in Canada.

When the rear vent collar is being used, from

inside the firebox, remove the two screws se­curing the lintel to the rear wall of the firebox,
then remove the lintel. Remove the four cover
plate securing screws.

Remove and discard the cover plate. Rein
stall and securely tighten all four cover plate
screws. Re-secure the lintel to the rear wall
of the firebox.

Vent Restrictor Installation

A vent restrictor may be needed when vertical­ly terminating the vent system above the roof
(when using the appliance top vent), install
vent restrictor in the top vent of the fireplace

-

outlet on LMDV-3530/4035 and LMDVT-3328
series models. If needed, install the restrictor
orientated as shown, either from inside or out­side the unit,in the inner fireplace collar.

(Top Vent)

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
flue serving a solid fuel burning appliance. The
vent pipe is tested to be run inside an enclosing
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.

Preparing the Appliance Vent Collar on LMDV­3530/4035 Series (Combined Top and Rear
Vent) Models.

Each of the unit's two vent collars are sealed
with a cover plate and a seal plate and gasket.
The cover, and seal plate and gasket must be
removed from the vent collar being used. Refer
to

Figure 16 for top vent usage and Figure 17
for rear, and the following steps to prepare the
appropriate collar for use.

From the vent collar being used, remove the four
screws securing the vent seal plate and gasket.
Remove and discard the seal plate and gasket.

When the top vent collar is being used, from
inside the firebox, loosen the two screws in the
keyhole slots of the cover plate and remove the
remaining two cover plate securing screws.
Remove and discard the cover plate.

Reinstall

and securely tighten all four screws.

WARNING

Failure to reinstall and securely
tighten cover plate screws could
result in leakage of flue products
into the living space. Vent cover
plate and vent seal plate must
remain securely installed on
unused vent collar. Failure to do
so could result in leakage of flue
products into living space.

On LMDV-3530/4035 Series Models

(Combined Top And Rear Vent Units)

Top Vent Seal & Cover Plate Removal

When Using The Top Vent

(OUTSIDE of

Appli

ance)

Cabinet Top

Firebox Top

Vent Cover Plate

(Inside of Appli

Gasket

Top Vent

Vent Seal Plate

Securing
Screws

Cover Plate
Securing Screws

ance)

CROSS SECTION

Figure 16

On LMDV-3530/4035 Series Models

(Combined Top And Rear Vent Units)

Rear Vent Seal & Cover Plate Removal

When Using The Rear Vent

Cover Plate
Securing Screws

(INSIDE of

Appli

ance)

Lintel

Lintel
Securing
Screws

Rear Vent

CROSS SECTION

Vent Seal Plate

Gasket

Securing
Screws

Cabinet
Back

(OUTSIDE of

Appli

ance)

Figure 17

Installation of Vent Restrictor

A vent restrictor may be needed with this ap
pliance, install vent restrictor (provided) in the
appliance top flue outlet as shown in
(LMDV-3328, LMDV-3530 and LMDV-4035) or
rear flue outlet as shown in

Figure 19 (LMDV-

3328, LMDV-3530 and LMDV-4035). It is held

in place by friction, only.

Figure 18

Restrictor

Inner
Fireplace
Collar

Appliance Top

Vent Outlet

Figure 18

VENT RESTRICTOR INSTALLATION

A vent restrictor may be needed when horzontally
terminating the vent system from the rear of the
appliance (when using the appliance rear vent),
install vent restrictor in the rear vent of the fire­place outlet on LMDV(R)-3328/3530/4035 series
models, in any installation that has a vertical vent
run in excess of three feet (0.914 meters).

If needed, install the restrictor orientated as
shown, either from inside or outside the unit,
in the inner fireplace collar

Inner Fireplace

Collar

(REAR VENT)

Appliance Rear
Vent Outlet

Restrictor

Figure 19

Select Venting System - Horizontal or Vertical

With the appliance secured in framing, de
termine vent routing and identify the exterior
termination location. The following sections
describe vertical (roof) and horizontal (exterior

­wall) vent applications. Refer to the section

relating to your installation.

venting components is shown on Pages 31
and 32.

A list of approved

-

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

11