Lennox MLDVTCD-35NE, MLDVTCD-35NM User Manual

P/N 506015-03 Rev. F 06/2011

This manual is part of a set of three supporting this product. Refer to manual 506017-02 for Care and Operation information and 506019-40 for Facade Installation Instructions.

Ce manuel est disponible en francais, simplement en faire la demande. Numéro de la pièce 506223-05.

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.

INSTALLATION INSTRUCTIONS

	MLDVTCD Direct-Vent				™
	Contemporary Design
	Gas Fireplaces
	MODELS	MILLIVOLT:	ELECTRONIC:
	MLDVTCD-35NM		MLDVTCD-35NE

Report No. 100353019PRT-002

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.

WARNING/AVERTISSEMENT/AVISO

• HOT GLASS WILL CAUSE	• UNE SURFACE VITRÉE CHAUDE	• EL VIDRIO CALIENTE
BURNS.	PEUT CAUSER DES BRÛLURES.	CAUSARÁ QUEMADURAS.
• DO NOT TOUCH GLASS	• LAISSER REFROIDIR LA SURFACE	• USTED DEBE NUNCA
UNTIL COOLED.	VITRÉE AVANT D'Y TOUCHER.	TOCAR EL VIDRIO CALIENTE.
• NEVER ALLOW CHILDREN	• NE PERMETTEZ JAMAIS À UN ENFANT	• LOS NIÑOS DEBEN NUNCA
TO TOUCH GLASS.	DE TOUCHER LA SURFACE VITRÉE.	TOCAR EL VIDRIO.

WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result, causing property damage, personal injury, or death.

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

-WHAT TO DO IF YOU SMELL GAS:

•Do not try to light any appliance.

•Do not touch any electrical switch; do not use any phone in your building.

•Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.

•If you cannot reach your gas supplier, call the fire department.

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

AVERTISSEMENT : Assurez-vous de bien suivre les instructions données dans cette notice pour réduire au minimum le risque d’incindie ou d’explosion ou pour éviter tout dommage matériel, toute blessure ou la mort.

-Ne pas entreposer ni utilizer d’essence ni d’autres vapeurs ou liquides inflammables dans le voisinage de cet appareil ou de tout autre appareil.

-QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ :

•Ne pas tenter d’allumer d’appareil.

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

•Appelez immédiatement votre fournisseur de gaz depuis un voisin. Suivez les instructions du fournisseur.

•Si vous ne pouvez rejoindre le fournisseur de gaz, appelez le service des incindies.

-L’installation et l’entretien doivent être assurés par un installateur ou un service d’entretien qualifié ou par le fournisseur de gaz.

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS

TABLE OF CONTENTS
Packaging..........................................		Page	2
Introduction.......................................		Page	2
General Information...........................		Page	2
Requirements for the
Commonwealth of Massachusetts..Page			4
New York City Approval.....................		Page	4
Cold Climate Insulation......................		Page	5
Manufactured Home Requirements...		Page	5
Location	.............................................	Page	5
Vent Termination ............Clearances		Page	6
Appliance ..........and Vent Clearances		Page	8
Detailed .................Installation Steps		Page	9
Typical Installation ............Sequence		Page	9
Step 1. Framing.................................		Page	9
Fireplace and Framing Specifications.Page			10
Step 2. Routing ...................Gas Line		Page	11
Step 3. Install .....the Venting System		Page	12
Vertical Termination ............Systems		Page	13
Vent Section .................Length Chart		Page	13
Vertical Vent ........Tables and Figures		Page	16
Horizontal ..........Termination System		Page	17
Horizontal ....Vent Tables and Figures		Page	20
Venting Using .......Flexible Vent Pipe		Page	23
Step 4. .........................	Field Wiring	Page	24
Step 5. Optional Blower Kit Wiring..Page			25
Step 6. ............Connecting Gas Line		Page	26
Step 7.	Verifying Appliance Operation.Page		27
Step 8.	Installing
Contemporary .......................Media		Page 28
Step 9. ..........Installing Glass Door		Page	30
Step 10. .............Burner Adjustments		Page	30
Step 11. .................Hood Installation		Page	32
Finishing .....................Requirements		Page	32
Step 12. Attaching Safety-in-
Operation ........................Warnings		Page 33
Installation .....................Accessories		Page	34
Gas Conversion .........................Kits		Page 36

Please read and understand these instructions before beginning your installation.

PACKAGING

The assembled vented gas fireplace is packaged with:

•One envelope containing the literature package which consists of the care and operations manual, installation instructions, safety in operation warning labels and warranty; envelope is located in the control compartment.

•One vent restrictor to be applied as shown on

Page 12; restrictor is taped to the envelope.

•One hood located behind the door assembly.

•Oneofthefollowingcontemporaryfloormedia kits (sold separately):

a.Tumbled River Stone

b.Crushed Glass, Obsidian Black

c.Crushed Glass, Diamond White

d.Crushed Glass, Deep Sea Blue

e.White Beach Sand

•Optional Contemporary facade kits (sold separately)

Introduction

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

The Electronic appliances have an electronic intermittent pilot ignition system. External electrical power is required to operate these units. The battery back-up can be used in case of a power outage.

These vented gas fireplaces are sealed combustion, air-circulating gas fireplaces designed for residential applications.

Use Only These Approved Vent Components:

These fireplaces are designed, tested and listed for operation and installation with, the following (4-1/2" inner and 7-1/2" outer) vent components only:

•Secure Vent™ Direct-Vent System Components manufactured by Security Chimneys International,

•Secure Flex™ Flexible Vent Components manufactured by Security Chimneys International 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.

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 physicalbarrierisrecommended 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

Lesjeunesenfantsdevraientêtre 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 unebarrièrephysique si des personnes à risques habitent la maison. Pour empêcher l’accès à un foyer ou à un poêle, installez une barrière de sécurité;cettemesureempêcherales tout petits, les jeunes enfants et toute autre personne à risque d’avoir accès à la pièce et aux surfaces chaudes.

Children and adults should be alerted to the hazards of high surface temperature and should stay away to avoid burns or clothing ignition.

Les enfants et les adultes devraient être informés des dangers que posent les températures de surface élevées et se tenir à distance afin d’éviter des brûlures ou que leurs vêtements ne s’enflamment.

DO NOT ATTEMPT TO ALTER OR MODIFY THE CONSTRUCTION OF THE APPLIANCE OR ITS COMPONENTS. ANY MODIFICATION OR ALTERATIONMAY VOIDTHEWARRANTY,CERTIFICATION AND LISTINGS OF THIS UNIT.

2

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information consult a qualified installer, service agency or the gas supplier.

WARNING

Failure to comply with these installationinstructionswillresult in an improperly installed and operating appliance, voiding its warranty. Anychangetothisappliance and/or its operating controls is dangerous.

WARNING

Clothing or other flammable material should not be placed on or near the appliance.

AVERTISSEMENT

On ne devrait pas placer de vêtements ni d’autres matières inflammables sur l’appareil ni à proximité.

WARNING

Any safety screen or guard removed for servicing the appliance must be replaced prior to operating the appliance.

AVERTISSEMENT

Tout écran ou protecteur retiré pour permettre l’entretien de l’appareil doit être remis en place avant de mettre l’appareil en marche.

WARNING

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

Note: Installation and repair should be done by a qualified service person. The appliance should be inspected before use and at least annually by a professional service person. More frequent cleaning may be required due to excessive lint from carpeting, bedding material, etcetera. It is imperative that control compartments, burners and circulating air passageways of the appliance be kept clean.

Remarque : L’installation et la réparation devrait être confiées à un technicien qualifié. L’appareil devrait faire l’objet d’une inspection par un technicien professionnel avant d’être utilisé et au moins une fois l’an par la suite. Des nettoyages plus fréquents peuvent être nécessaires si les tapis, la literie, et cetera produisent une quantité importante de pous-sière. Il est essentiel que les compartiments abritant les commandes, les brûleurs et les conduits de circulation d’air de l’appareil soient tenus propres.

Do not use these appliances if any part has been under water. Immediately call a qualified, professional service technician to inspect the appliance and to replace any parts of the control system and any gas control which have been under water.

Ne pas 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.

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

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

These appliances comply with National Safety Standards and are tested and listed by ETL/

Intertek (Report No. 100353019PRT-002) to ANSI Z21.50 (in Canada, CSA-2.22), and CAN/ CGA-2.17-M91 in both USA and Canada, as vented gas fireplaces.

Both millivolt and electronic versions of these appliances are listed by ETL/Intertek for installation in bedrooms and Manufactured Homes.

Misc. Codes / Standards

The Installation must conform to local codes or, in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 - latest edition (In Canada, the current CAN/CSA-B149.1 installation code).

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

Code, CSA C22.1 - latest edition.

Provide adequate clearances around air openings and adequate accessibility clearance for service and proper operation. Never obstruct the front 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 decorative and are designed to provide supplemental heat. Therefore, it is advisabletohaveanalternateprimaryheatsource when installed in a dwelling.

These appliances must not be connected to a chimney or flue serving a separate solid fuel burning appliance.

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-modulatedgasvalve;flameappearanceand heat output can be controlled at the gas valve. The BTU Input for these appliances is shown in Table 1.

Electronic Models - These electronic appliances are manually 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 manually-modulated gas valve; flame appearance and heat output can be controlled at the gas valve. The BTU Input for these appliances is shown in Table 1.

Input (BTU/HR) Manually-Modulated

Gas Valves (all models)

	Models	Input Rate (BTU / HR)
		Nat. Gas	Prop. Gas
	MLDVTCD-35	14,500 high	13,500 high
		11,500 low	10,500 low

Table 1

3

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Gas Pressure - All Models

Tables 2 and 3 show the appliances' gas pressure requirements:

Inlet Gas Supply Pressure

(all models)

Fuel #		Minimum			Maximum
Natural Gas		4.5" WC			10.5" WC
		(1.12 kPa)			(2.61 kPa)
Propane		11.0" WC			13.0" WC
		(2.74 kPa)			(3.23 kPa)
Table 2
Manifold Gas Supply Pressure
		(all models)
Fuel #		Low			High
Natural	(Lo) 2.2" WC				(Hi) 3.5" WC
Gas		(0.55 kPa)			(0.87 kPa)
Propane	(Lo) 6.3" WC				(Hi) 10.0" WC
		(1.57 kPa)			(2.49 kPa)

Table 3

Test gauge connections are provided on the front of the millivolt and electronic gas control valve (identified IN for the inlet and OUT for the manifold side). The control valves have a 3/8" (10mm) NPT thread inlet and outlet side of the valve.

Propane tanks are at pressures that will cause damage to valve components. Verify that the tanks have step down regulators to reduce the pressure to safe levels.

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 valves must be disconnected from the gas supply piping system during any pressure testing of that system at pressures greater than 1/2 psig (3.5 kPa).

These appliances must not be connected to a chimney or flue serving a separate solid fuel burning appliance.

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 4). For elevations above 4500 feet, contact your gas supplier or qualified 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 orifice to a smaller size as regulated by the local authorities having jurisdiction and by the (USA) National Fuel Gas Code NFPA 54/ANSI Z223.1 - latest edition or, in Canada, the CAN/CSA-B149.1 codes - latest edition.

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

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

Burner Orifice Sizes Elevation 0-4500 feet ( 0-1372 meters)

Model Nat.Gas Propane

	Series	drill size (inches)	drill size (inches)
	MLDVTCD-35	#49 (0.073") *	0.045" **
		21L82•	75L10 •

*Standard size installed at factory

**Standard size in LP conversion kit

Table 4 • Part /Cat. Number

Gas Valve Diagrams

See Figure 1 for Millivolt models and Figure 2 For Electronic Models.

Main Gas Control Knob			Pilot Adjustment
	OFF/PILOT/ON			Screw
				O
			IL T
			P
T	ON
	it			H
O		WO		T
L
I		L
P
	FFO	HI		TP
				TPTH
IN	OUT
Manifold Pressure Tap
Inlet Pressure Tap				HI/LO Variable
				Flame Height
				Adjustment
Figure 1 - SIT Millivolt Gas Valve

Supply	Pressure-Tap		Regulator			Burner Stage
Gas	(Manifold)		Mounting Screw			Terminal
Inlet
				VENT
IN			OUT			TH
	PILOT			HI	LO	TP
						TH TP
			IN
	Pilot Gas	Pressure-Tap		Ground		Pilot Stage
	Outlet	(Inlet)		(TP)		Terminal
Figure 2 - Dexen Electronic Gas Valve

REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS

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

•Install this appliance in accordance with

Massachusetts Rules and Regulations 248 C.M.R.

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

•The 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.

NEW YORK CITY, NEW YORK (MEA)

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

4	NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS

COLD CLIMATE INSULATION

For cold climate installations, seal all cracks around your appliance with noncombustible material and wherever cold air could enter the room. It is especially important to insulate outside chase cavity between studs and under floor on which appliance rests, if floor is above ground level. Gas line holes and other openings should be caulked or stuffed with unfaced fiberglass insulation.

If the fireplace is being installed on a cement slab in cold climates, a sheet of plywood or other raised platform can be placed underneath to prevent cold transfer to the fireplace and into the room. It also helps to sheetrock inside surfaces and tape for maximum air tightness and caulk firestops.

MANUFACTURED HOME

REQUIREMENTS

This appliance may be installed in an aftermarket permanently located, manufactured home and must be installed in accordance with the manufacturer's instructions and the Manufactured Home Construction and Safety Standard, Title 24 CFR, Part 3280, in the United States, or the Standard for Installation in Mobile Homes, CAN/CSA Z240 MH Series, in Canada.

Cet appareil peut être installé cómme du matériel d'origine dans une maison préfabriquée (É.U. seulement) ou mobile et doit être installé selon les instructions du fabricant et conformément

àla norme Manufactured Home Constructions and Safety, Title 24 CFR, Part 3200 aux Unis ou

àla norme Can/CSA-Z240 Série MM, Maisons mobiles au Canada.

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

Cet appareil doit être utilisé uniquement avec le type de gaz indiqué sur la plaque signalétique. Cet appareil ne peut être converti à d'autres gaz, sauf si une trousse de conversion est utilisée.

CAUTION: Ensure that the cross members are not cut or weakened during installation. The structural integrity of the manufactured home floor, wall, and ceiling / roof must be maintained.

CAUTION: This appliance must be grounded to the chassis of the manufactured home in accordance with local codes or in the absence of local codes, with the National Electrical Code ANSI / NFPA 70 - latest edition or the Canadian Electrical Code CSA C22.1 - latest edition.

										Note: When the unit is installed with one
					T					side flush with a wall, the wall on the other
				N			N
			E				IO			side of the unit must not extend beyond the
		V
	P					T
					A
O			IC				VENTTOP APPLICATION	VENTTOP	APPLICATION
T			L							front edge of the unit.
		P
	P
A
APPLICATION								VENTTOP	APPLICATION
			INSTALLATION
TOP VENT
						RECESSED
							TOP VENT
							APPLICATION

HORIZONTAL VENT

(Top Vent Application)

VERTICAL VENT

(Top Vent Application)

Figure 3 - Typical Locations

LOCATION		Be aware that this is a heat producing ap-
		pliance. Objects placed above the unit are
In selecting the location, the aesthetic and		exposed to elevated temperatures.
functional use of the appliance are primary		Do not insulate the space between the ap-
concerns. However, vent system routing to
the exterior and access to the fuel supply are		pliance and the area above it (see Figure 7
also important.		on Page 8).
Due to high temperatures, the appliance		The minimum height from the base of the appli-
should be located out of traffic and away from		ance to the underside of combustible materials
furniture and draperies (Figure 3).		used to construct a utility shelf in this fashion
Enraisondestempératuresélevées,l’appareil		is shown in Figure 7 on Page 8.
devrait être installé dans un endroit où il y a		The appliance should be mounted on a fully
peu de circulation et loin du mobilier et des		supported base extending the full width and
tentures (Figure 3).
		depth of the unit. The appliance may be located
The location should also be free of electrical,		on or near conventional construction materials.
		However, if installed on combustible materials,
plumbing or other heating/air conditioning
		such as carpeting, vinyl tile, etc., a metal or
ducting.
		wood barrier covering the entire bottom surface
These direct-vent appliances are uniquely		must be used.
suited for installations requiring a utility shelf
positioned directly above the fireplace. Utility
shelves like these are commonly used for locat-
ing television sets and decorative plants.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.		5

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS

	Vent Termination Clearances	Vertical Vent Termination		Clearances
	These instructions should be used as a				Termination Heights For Vents
		TERMINATION HEIGHTS FOR VENTS ABOVE			Above Flat Or Sloped Roofs
	guideline and do not supersede local codes
			FLAT OR SLOPED ROOFS		Ref. NFPA 54 / ANSI Z223.1
	in any way. Install venting according to local	Horizontal Overhang
					Roof Pitch	* Feet	*Meters
	codes, these instructions, the current National		2 FT	Vertical
	Fuel Gas Code (ANSI-Z223.1) in the USA or	2 FT MIN.	MIN.	Wall	Flat to 6/12	1.0	0.3
			Lowest
	the current standards of CAN/CSA-B149.1 in				6/12 to 7/12	1.25	0.38
			Discharge
	Canada.	Vent
			Opening		7/12 to 8/12	1.5	0.46
		Termination
		Storm Collar	H*		8/12 to 9/12	2.0	0.61
	Vertical Vent Termination Clearances			X
					9/12 to 10/12	2.5	0.76
		Flashing	12
			Roof Pitch is X/12		10/12 to 11/12	3.25	0.99
	Terminate multiple vent terminations according
			1 inch (25.4 mm) Minimum		11/12 to 12/12	4.0	1.22
	to the installation codes listed above. Also see
			Clearance to Combustibles
	Figure 4A.	Concentric	*H = MINIMUM HEIGHT FROM ROOF TO		12/12 to 14/12	5.0	1.52
		Vent Pipe	LOWEST DISCHARGE OPENING OF VENT		14/12 to 16/12	6.0	1.83
	Terminate single vent caps relative to building
		The vent / air intake termination clearances			16/12 to 18/12	7.0	2.13
	components according to Figure 4B.
		above the high side of an angled roof is as			18/12 to 20/12	7.5	2.29
		shown in the following chart:
					20/12 to 21/12	8.0	2.44
		Figure 4B
	12”
	(305mm)	Horizontal Vent Termination Clearances
	Minimum

The horizontal vent termination must have a minimum of 6" (152 mm) clearance to any overhead combustible projection of 2-1/2" (64 mm) or less. See Figure 5. For projections exceeding 2-1/2" (64 mm), see Figure 5. For additional vent location restrictions refer to Figure 6 on Page 7.

		Horizontal Vent Termination Clearances
Figure 4A - Multiple Terminations		Combustible Projection
	2-1/2 inches or less in length		All horizontal terminations
Combustible Projection greater			may be located as close as
than 2-1/2 inches in length			6 (152mm) to any
			(non-combustible and
Ventilated			combustible) exterior
Soffit	Unventilated		sidewall. This distance
	Soffit		may be decreased to 2
		6"	(51mm) for non-
			combustible exterior
18"	12"	(152 mm)	sidewalls only, if the
(457 mm)	(305 mm)		SV4.5HT-2 termination
			is used.
			Termination Kit

Side Elevation View

	Termination Kit
Figure 5	Note - See Figure 28 on Page 19 for the exterior wall recess
	allowances of the square horizontal termination.

6	NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Exterior HORIZONTAL Vent TERMINATION Clearance Requirements

NOTE: Local Codes Or Regulations

* See Item D in the Text Below.

May Require Different Clearances.

P

NOTE: Location Of The Vent Termination

N

N

Exterior Wall

Inside

Corner Detail

Must Not Interfere With Access To The

O

Electrical Service.

*18”

G

Q

V

Horizontal

V

Termination

6”

Ventilated Soffit

V

A

Inside Corner

A

= 9” in U.S.

Detail D

= 12” in Canada

H

3 ft.

B

C

B

X

D

E

V

A

A

L

V

V

Fixed

V

Operable

Closed

Window

3 ft.

Window

F

V

C

B

J

V

M

C

C

B

B

X

A

I

V

K

X = Air Supply Inlet

= Vent Termination

= Area where Termination is not Permitted

V

Canadian Installation*

US Installation**

A = Clearance above grade, veranda, porch, deck, or balcony.

12 inches (30cm)*

12 inches (30cm)**

B = Clearance to window or door that may be opened.

6 inches (15cm) for appliances

6 inches (15cm) for appliances

< 10,000 Btuh (3kW), 12 inches (30cm)

< 10,000 Btuh (3kW), 9 inches (23cm)

for appliances > 10,000 Btuh (3kW)

for appliances > 10,000 Btuh (3kW) and

< 50,000 Btuh (15kW), 12 inches (30cm)

for appliances > 50,000 Btuh (15kW)**

C = Clearance to permanently closed window

12 inches (305mm) recommended to

9 inches (229mm) recommended to

prevent window condensation

prevent window condensation

D = Vertical clearance to ventilated soffit located above the

18 inches (458mm)

18 inches (458mm)

termination within a horizontal distance of 18 inches (458mm)

from the center line of the termination

E = Clearance to unventilated soffit***

12 inches (305mm)

12 inches (305mm)

F = Clearance to outside corner

5 inches (12.7cm) minimum

5 inches (12.7cm) minimum

G = Clearance to inside corner (Refer to Figure 5)

6 inches (15.2cm) minimum

6 inches (15.2cm) minimum

H = Clearance to each inside of center line extended above

3 feet (91cm) within a height of 15 feet

3 feet (91cm) within a height of 15 feet

meter/regulator assembly

above the meter/regulator assembly*

above the meter/regulator assembly**

I = Clearance to service regulator vent outlet

3 feet (91cm)*

3 feet (91cm)**

J = Clearance to nonmechanical air supply inlet to building or

6 inches (15cm) for appliances

6 inches (15cm) for appliances

the combustion air inlet to any other appliance

< 10,000 Btuh (3kW), 12 inches (30cm)

< 10,000 Btuh (3kW), 9 inches (23cm)

for appliances > 10,000 Btuh (3kW)

for appliances > 10,000 Btuh (3kW) and

< 50,000 Btuh (15kW), 12 inches (30cm)

for appliances > 50,000 Btuh (15kW)**

K = Clearance to a mechanical air supply inlet

6 feet (1.83m)*

3 feet (91cm) above if within 10 feet

(3m) horizontally**

L = Clearance above paved sidewalk or paved diveway located

7 feet (2.13m)‡

7 feet (2.13m)‡

on public property

M = Clearance under veranda, porch, deck or balcony

12 inches (30cm)*‡

12 inches (30cm)‡

N = Depth of Alcove (Maximum)

6 feet (1.83m)*

6 feet (1.83m)**

O = Clearance to Termination (Alcove)

6 inches (15.2mm)*

6 inches (15.2mm)**

P = Width of Alcove (Minimum)

3 feet (91cm)*

3 feet (91cm)*

Q = Clearance to Combustible Above (Alcove)

18 inches (457mm)*

18 inches (457mm)**

* In accordance with the current CAN/CSA-B149.1 National Gas And Propane Installation Code.

** In accordance with the curent ANSI SZ223.1/NFPA 54 National Fuel Gas Codes.

*** Clearance required to vinyl soffit material - 30 inches (76cm) minimum.

‡ 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 floor:

Figure 6

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

7

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS

MINIMUM CLEARANCES TO COMBUSTIBLES
Appliance And Vent Clearances			Model No.		Combustible Shelf Height - Inches (millimeters)
							Top Vent - with One 90 Degree Elbow
The appliance is approved with zero clearance to combustible materials on						Secure Vent			Secure Flex (flex elbow)
all sides (as detailed in Table 5), with the following exception: When the			MLDVTCD-35			*46-1/2 (1181)			*48-1/4 (1226)
unit is installed with one side flush with a wall, the wall on the other			* Includes 3” clearance to combustibles (required above vent components)
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				Do not insulate the
must not extend beyond the front edge of the unit (see Figure 3).
				space between the
				appliance and the
MINIMUM CLEARANCES*		Inches (millimeters)		area above it.
Back		0 (0) Spacers Or Dimples
Sides		1/2 (13)**
		0 (0) Spacers or Dimples		*Shelf Height
Top		3 (76)			(see table)
Floor		0 (0)
From Bottom of Unit To Ceiling		64 (1626)
Vent	3 (76) Top* / 1 (25.4) Sides & Bottom		Figure 7 - Shelf Height Minimum Clearances With Top Venting
SERVICE CLEARANCES Feet (meters)
Front		3 feet (0.9 meters)			Mantel Depth
Table 5			18 (457)						inches (millimeters)
*Note: 3 in. (75 mm) above any horizontal/inclined vent component.			16 (406)
**Note: SeePage9,Step1forclearancerequirementstothenailingflange			14 (356)
									Header
located at each side of the unit and any screw heads adjacent to it.			12 (305)
									Top of
Hearth Extension A hearth extension is not required with this appliance.
			10 (254)						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			8 (203)
to conform to standard hearth extension installation requirements.
Shelf Height - To provide for the lowest possible shelf surface, the venting			12	10	8	6	4	2	Note - Hood shown
attached to the top vent should be routed in a way to minimize obstructions									as positioned.
to the space above the appliance. Do not insulate the space between the			(305)	(254)	(203)	(152)	(102)	(51)
appliance and the area above it (see Figure 7). The minimum height from
the base of the appliance to the underside of combustible materials used			Figure 8 - Minimum Mantel Clearances
to construct a utility shelf in this fashion is shown in Figure 7.

Wall Finishes / Surrounds / Mantels

Note: Combustible wall finish materials and/or surround materials must

At 14" minimum

At 8-1/4" side

not be allowed to encroach the area defined by the appliance front face

side wall clearance,

wall clearance, a

Top View of

(black sheet metal). Never allow combustible materials to be positioned

a combustible wall

combustible wall

in front of or overlapping the appliance front face (see Figure 47 on

can project to any

can project 12"

Fireplace

length.

Page 32).

Non-combustible materials, such as surrounds and other appliance trim,

Combustible Materials

Allowed In Shaded Area

may be installed on the appliance face with these exceptions: they must

45o

5 (127)

“Safe Zone”

not cover any portion of the removable glass panel.

Combustible Walls

shown in dark gray

Vertical installation clearances to combustible mantels vary according

Combustiblematerialsmay

to the depth of the mantel. See Figure 8. Mantels constructed of non-

project

beyond

one side

combustible materials may be installed at any height above the appliance

12 (305)

of the

fireplace

opening

opening; however, do not allow anything to hang below the hood.

as long as they are kept

NOTE: We recommend the use of high temperature paint (rated 175° F or higher)

within

the

shaded areas

illustrated

here.

on the underside of the mantel.

19 (483)

Inches (millimeters)

1/4 Protected wall shown in white

14

8-

(356)

(209)

Figure 9 - Minimum Distance to Unprotected Side Wall

8

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS

WARNING

Failure to position the parts in accordance with these diagrams or failure to use only parts specificallyapprovedwiththisappliance may result in property damage or personal injury.

AVERTISSEMENT

Risque de dommages ou de blessures si les pièces ne sont pas installées conformément à ces schémas et ou si des pièces autres que celles spécifiquement approuvéesaveccetappareilsont utilisées.

Detailed Installation Steps

The appliance is shipped with all gas controls and components installed and pre-wired.

1.Remove the shipping carton. Remove the shipping pad, exposing the front glass door.

2.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 Removing Glass Panels on Page 30.

TYPICAL INSTALLATION SEQUENCE

The typical sequence of installation is outlined below. However, each installation is unique and may result in variations to the steps described.

See the Page numbers references in the following steps for detailed procedures.

Step 1. (Pages 10 and 11) Construct the appliance framing. Position the appliance within the framing and secure with nailing brackets. Bend up the appropriateheaderspacingguidesfor the drywall/finish material thickness to be used (see Figure 47 on Page 32). Bend up the outer pair for 1/2" materials and the inner pair for 5/8" materials. Bend out the appropriate nailing flanges for the drywall/finish material to be used. Nailing flanges are provided for flush framing, 1/2 inch and 5/8 inch framing depths

(see Figure 10).

Step 2. (Page 11) Route gas supply line to appliance location.

Step 3. (Page 12) Install the vent system and exterior termination.

Step 4. (Page 24) Field Wiring

a.Millivolt Appliances – Bring in electrical service line for forced aircirculating blower (optional equipment).

b.Electronic Appliances – Field wire. Step 5. (Page 25) Install blower kit (optional

equipment).

Step 6. (Page 26) Make connection to gas supply.

Step 7. (Page 27) Verify appliance operation.

Step 8. (Page 28) Install contemporary media.

Step 9. (Page 30) Install glass door assembly.

Step 10. (Page 30) Adjust burner primary air shutter to achieve proper flame appearance.

Step 11. (Page 32) Install the hoods.

Step 12. (Page 33) Attach Safety in Operation

Warnings.

Step 1. Framing

Frame these appliances as illustrated in Figures 11 and 12 on Pages 10 and 11 (Figure 12 applies to corner framing installations only). All framing details must allow for a minimum clearance to combustible framing members as shown in Table 5 on Page 8.

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

Headers may be in direct contact with the appliance top spacers when they are bent up vertically maintaining the 3" clearance to the fireplace top, but must not be supported by them or notched to fit around them. All construction above the appliance must be self-supporting. DO NOT use the appliance for structural support.

The fireplace should be secured to the side framing members using the unit's nailing flanges - one top and bottom on each side of the fireplace front. See Figure 10. Use 8d nails or their equivalent.

Unit

Nailing Flange

Side

Framing

Nailing Flanges Are

Provided At All Four

Corners At 5/8”, 1/2”

And Flush Settings

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

Unit Being Secured By Its Nailing Flanges

To The Framing

Note: The nailing flanges, combustible members and screw heads located in areas directly adjacent to the nailing flanges, are EXEMPT from the 1/2” clearance to combustible requirements for the firebox outer wrapper. Combustible framing may be in direct contact with the nailing flanges and may be located closer than 1/2” from screw heads and the firebox wrapper in areas adjacent to the nailing flanges. Frame the opening to the exact dimensions specified in the framing details of this manual.

Figure 10

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

9

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS

FIREPLACE AND FRAMING SPECIFICATIONS

Framing

Framing Dimensions

Model No.

A

B

C

D

MLDVTCD-35

in.

35-1/4

35-1/4

39-1/4

16

mm

895

895

997

406

Efficiencies %

Natural Gas

Propane

Model

P4

P4

MLDVTCD-35

48

51

Vent Size

Co-axial DV

4-1/2" Inner

Vent Size

7-1/2" Outer

Viewable Glass Size

35" Model

29-1/4" Wide

20-1/4" High

Input (BTU) - MV & Electronic

Natural & Propane Gas

Model

Input Rate (BTU / HR)

MLDVTCD-35N

14,500

MLDVTCD-35P

13,500

Notes

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.

Inches (mm)

VENT FRAMING - TOP VENT WITH ONE 90° ELBOW

Framing should be constructed of 2x4 or larger lumber

10-1/2 (267)

7

5-1/8 (178)

(130)12-1/8

(308)

B

1/2 A

A

Add Minimum Of 18” For

Raised Platform If Installing

With Contemporary Facade.

C

D

Raised Platform

Or Floor

D is the required framing depth dimension when the finish material (drywall) thickness is 1/2 in. (13mm)

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 16 on Page 14).

NOTE: It is recommended that the gas be stubbed in from the left side only.

						ELECTRICAL INLET
						KNOCKOUT - 2-3/4 X 2
			J			(70 X 51) COVER PLATE
						(With KNOCKOUT -
						Right Side Only)
	K					GAS INLET
L						KNOCKOUT
	*CONCENTRIC FLUE	E				(Other Side)
	FLUE - 4-1/2 (114)			G		OPTIONAL
	COMBUSTION AIR				F
	- 7-1/2 (190)	H				ELECTRICAL
						INLET KNOCKOUT,
1/2						REQUIRING A FIELD
						PROVIDED
(13)	9-1/4 (235)
						JUNCTION BOX
						(Either Side)
			M

Top View

Front View

3 (76)

NOTE - Eyebrow hood shown.

16 (406)

5-7/8 (149)

9-1/2

(241)

1-5/8 (42) 3 (76)

Right Side View

	Model No.		E	F	G	H	J	K	L	M
	MLDVTCD-35	in.	32-1/4	28-1/8	23-1/4	32	35-1/4	25	12-1/2	33
		mm	819	715	587	813	892	635	317	838

Figure 11

10	NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS

fireplace FRAMING specifications

Model No.		A	B	C	D	E	E
	in.	35 1/4	57 1/2	40 5/8	28 3/4	13 3/4
MLDVTCD-35
	mm	895	1461	1032	730	349	7 (178)
						C
							D
							A
							B
						Back wall of chase/enclosure	Inches
						(including any finishing materials)	(millimeters)
Figure 12 - Corner Framing with Horizontal Termination

Step 2. Routing Gas Line

Never use galvanized or plastic pipe. Refer

Notes:

Route a 1/2" (13mm) gas line to the left side

to Table 6 for proper sizing of the gas sup-

• All appliances are factory-equipped with a

ply line, if black iron pipe is being used. Gas

flexiblegaslineconnectorand1/2inchshutoff

of the appliance as shown in Figure 13. Gas

lines must be routed, constructed and made

valve (see Figure 38 on Page 26).

lines must be routed, constructed and made

of materials that are in strict accordance with

• SeeMassachusetts Requirements on Page 4

of materials that are in strict accordance with

local codes and regulations. We recommend

for additional requirements for installations in

local codes and regulations. All appliances

that a qualified individual such as a plumber or

the state of Massachusetts in the USA.

are factory-equipped with a flexible gas line

gas fitter be hired to correctly size and route

• The gas supply line should Not be connected

connector and 1/2 inch shutoff valve (see Step

the gas supply line to the appliance. Installing

to the appliance until Step 6 (Page 26).

6 on Page 26).

a gas supply line from the fuel supply to the

• Apipejointcompoundratedforgasshouldbe

appliance involves numerous considerations of

used on the threaded joints. Ensure propane

Left Side Front

materials, protection, sizing, locations, controls,

resistant compounds are used in propane

pressure, sediment, and more. Certainly no one

applications. Be very careful that the pipe

Corner of Fireplace

Framing

unfamiliar and unqualified should attempt sizing

compound does not get inside the pipe.

Pipe Coupling

or installing gas piping.

• It is recommended to install a sediment trap

in the supply line as close as possible to the

(Recommended)

appliance. Appliances using Propane should

6-1/2"

Schedule 40

have a sediment trap at the base of the tank.

Black Iron Pipe

• Checkwithlocalbuildingofficialforlocalcode

(152 mm)

Inside Diameter (Inches)

requirements(i.e.arebelowgradepenetrations

of the gas line allowed?, etc).

*3"

Schedule 40 Pipe

Natural

Propane

Length (feet)

Gas

Gas

(76 mm)

IMPORTANT: If propane is used, be aware that

*From Floor Or Raised Platform

0-10

1/2

3/8

if tank size is too small (i.e. under 100-lbs, if

Also see Figure 11 on Page 10.

10-40

1/2

1/2

this is the only gas appliance in the dwelling.

Ref. NPFA 58), there may be loss of pressure,

Figure 13 - ROUTE GAS LINE

40-100

1/2

1/2

resulting in insufficient fuel delivery (which

100-150

3/4

1/2

can result in sooting, severe delayed ignition

Proper Sizing of Gas Line

150-200

3/4

1/2

or other malfunctions). Any damage resulting

from an improper installation, such as this, is

Table 6

Properly size and route the gas supply line

not covered under the limited warranty.

from the supply regulator to the area where the

appliance is to be installed per requirements

outlined in the National Fuel Gas Code, NFPA

54 - latest edition (USA) or CAN/CSA-B149.1

- latest edition (Canada).

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

11

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • 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, the current National Fuel Gas Code (ANSI-Z223.1) in the USA or the current standards of CAN/CSA-B149.1 in Canada.

Clearance in accordance with local installation codes and the requirements of the gas supplier.

Dégagementconformeauxcodesd'installation locaux et aux exigences du foumisseunde gaz.

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 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.

Installation of Vent Restrictor

A vent restrictor may be needed with this appliance. The restrictor is installed in the appliance top flue outlet as shown in Figure 14, either before adding vent, from above, or after installation of vent from below, within the firebox. The restrictor is self securing through a positive friction fit.

Determine the venting for the appliance. If the vent run will include at least 8 feet of vertical rise, then install the restrictor in the appliance collar before connecting any vent (Refer to

Figure 14). Place the restrictor inside the appliance vent collar and press in place.

Note: The restrictor is included within the firebox.

Vent Restrictor Installation

(Top Vent)

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 all MLDVTCD series models. If needed, install the restrictor orientated as shown,

either from inside or outside the unit,in the inner fireplace collar.

Restrictor

Inner

Fireplace

Collar Appliance Top

Vent Outlet

Figure 14

Select Venting System - Horizontal or Vertical

Withtheappliancesecuredinframing,determine 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. A list of approved venting components is shown on Pages 34 and 35.

Note: It is not recommended that this unit be vented more than forty feet (40') vertically. Extended vertical vent runs will diminish the fire.

12	NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.