Lennox MPDT33RPM, MPD35CNM, MPDR33RNM, MPDR33RPM, MPD35RNM Installation Instructions Manual

...

Page 1

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.

MPD Direct-Vent Gas Fireplaces

MODELS

P/N 506015-07 Rev. B 06/2013

This manual is one of a set of two supporting this product. Refer to P/N 506017-06 for Care and Operation Instructions.

Ce manuel est disponible en francais, simplement en faire la demande. Numéro de la pièce 506223-43.

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

INSTALLATEUR : Laissez cette notice avec l’appareil. CONSOMMATEUR : Conservez cette notice pour consultation ultérieure.

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

MPDT33RNM MPDT33RPM MPDR33RNM MPDR33RPM MPD35CNM MPD35RNM

Please read and understand these instructions

MILLIVOLT:

MPD35RPM MPD40CNM MPD40RNM MPD40RPM MPD45RNM MPD45RPM

OTL No. 116-F-13g-5

MPDT33RNE MPDR33RNE MPD35CNE MPD35RNE MPD35RNE-R

before starting installation.

ELECTRONIC:

MPD40CNE MPD40RNE MPD45RNE MPD40RNE-R

Portland

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LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

TABLE OF CONTENTS

Packaging .................................................... 2

Introduction ................................................. 2

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

Requirements for the

Commonwealth of Massachusetts ............ 4

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

Manufactured Home Requirements ............. 5

Location ........................................................5

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

Appliance and Vent Clearances .................... 8

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

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

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

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

Fireplace and Framing Speciﬁcations ....... 10

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

Step 3. Preparing Appliance Vent Collar ..... 12

Step 4. Installing Vent System ................... 12

Vertical Termination Systems .................. 13

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

Vertical Vent Tables and Figures .............. 16

Horizontal Termination System ............... 18

Horizontal Vent Tables and Figures ......... 20

Venting Using Flexible Vent Pipe ............. 23

Step 5. Field Wiring ................................... 24

Step 6. Optional Blower Kit Wiring ............ 25

Step 7. Connecting Gas Line ..................... 25

Step 8. Verifying Appliance Operation ........... 26

Step 9. Installing Logs ............................. 27

Step 10. Remove/Install Glass Door .......... 31

Step 11. Burner Adjustments ..................... 31

Step 12. Hood Installation .......................... 33

Finishing Requirements ............................. 33

Step 13. Attaching Safety-in-Operation

Warnings .................................... 34

Installation Accessories ............................. 35

Gas Conversion Kits ................................... 37

Please read and understand these instructions before beginning your

installation.

PACKAGING

The assembled vented gas ﬁreplace heater is packaged with:

• (1 set) Logs (packaged in a carton inside the

ﬁrebox).

• (1 bag) Glowing Embers (in bottom compartment).

• Literature Kit (envelope in bottom compartment containing Care and Operation Instructions, Installation Instructions, SafetyIn-Operation Warning Labels, Warranty).

• (1) U-Shaped Vent Restrictor (attached to Literature Kit envelope).

• (1) Hood (inside rebox).

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 are designed to operate on natural or propane gas. An electronic intermittent pilot ignition system provides safe, efﬁcient operation. External electrical power is required to operate these units. In the event of a power outage, four (4) "AA" batteries (in battery holder) provide backup power for appliance operation (excluding [optional] blower).

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

Approved Vent Components

These ﬁreplaces are designed, tested and listed for operation and installation with the following vent components only:

• Secure Vent

nents manufactured by Security Chimneys International,

• Secure Flex

manufactured by Security Chimneys International and

• Z-FLEX

to UL1777 and ULCS635 manufactured by Flexmaster Canada Limited.

Use only the correct size venting (4-1/2" inner and 7-1/2" outer).

These approved vent system components are labeled for identiﬁcation. DO NOT use any other manufacturer’s vent components with these appliances.

Direct-Vent System Compo-

Flexible Vent Components

Model GA Venting Systems listed

GENERAL INFORMATION

WARNING

Young children should be carefully supervised when they are in the same room as the appliance. Toddlers, young children and others may be susceptible to accidental contact burns. A physical barrier is recommended if there are at risk individuals in the house. To restrict access to a ﬁreplace or stove, install an adjustable safety gate to keep toddlers, young children and other at risk individuals out of the room and away from hot surfaces.

AVERTISSEMENT

Les jeunes enfants devraient être surveillés étroitement lorsqu’ils se trouvent dans la même pièce que l’appareil. Les tout petits, les jeunes enfants ou les adultes peuvent subir des brûlures s’ils viennent en contact avec la surface chaude. Il est recommandé d’installer une barrière physique si des personnes à risques habitent la maison. Pour empêcher l’accès à un foyer ou à un poêle, installez une barrière de sécurité; cette mesure empêchera les tout petits, les jeunes enfants et toute autre personne à risque d’avoir accès à la pièce et aux surfaces chaudes.

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

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

DO NOT ATTEMPT TO ALTER OR MODIFY THE CONSTRUCTION OF THE APPLIANCE OR ITS COMPONENTS. ANY MODIFICATION OR ALTERATION MAY VOID THE WARRANTY, CERTIFICATION AND LISTINGS OF THIS UNIT.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • 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 installation instructions will result in an improperly installed and operating appliance, voiding its warranty. Any change to this appliance and/or its operating controls is dangerous.

WARNING

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

AVERTISSEMENT

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

WARNING

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

AVERTISSEMENT

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

WARNING

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

WARNING

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

AVERTISSEMENT

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

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 this appliance if any part has been under water. Immediately call a qualiﬁed service technician to inspect the appliance and to replace any parts of the control system and any gas control which has 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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

These appliances comply with National Safety Standards and are tested and listed by OMNITest Laboratories, Inc. (Report No. 116-F-13g-5) to ANSI Z21.88-2009 (in Canada, CSA-2.33-

2009), and CAN/CGA-2.17-M91(R2009) 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.

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/

CGA-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 or back 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 supplemental heaters. Therefore, it is advisable to have an alternate primary heat source when installed in a dwelling.

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

Both millivolt and electronic systems can be operated during a power outage, and feature manually operated hi-low ﬂame control. The BTU Input for these appliances is shown in Table 1.

Models

MPD33

MPD35

MPD40

MPD45

Table 1 - Input (BTU/HR) Gas Valves (Millivolt and Electronic)

Input Rate (BTU/HR)

Nat. Gas Prop. Gas

17,500 high

11,700 low

20,000 high

12,800 low

27,000 high

18,500 low

29,000 high

20,500 low

17,500 high

14,000 low

20,000 high

15,200 low

27,000 high

21,500 low

29,000 high

22,500 low

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LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

Gas Pressure - All Models

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

Fuel # Minimum Maximum

Natural

Gas

Propane

4.5" WC

(1.12 kPa)

11.0" WC

(2.74 kPa)

10.5" WC

(2.61 kPa)

13.0" WC

(3.23 kPa)

Table 2: Inlet Gas Supply Pressure

Fuel # Low High

Natural

Gas

Propane

1.6" WC

(0.40 kPa)

6.3" WC

(1.57 kPa)

3.5" WC

(0.87 kPa)

10.0" WC

(2.49 kPa)

Table 3: Manifold Gas Supply Pressure

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" (10 mm) NPT thread inlet and outlet side of the valve (refer to Figures 1 and 2).

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

The appliance and its appliance main gas valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psi (3.5 kPa).

The appliance must be isolated from the gas supply piping system by closing its equipment shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psi (3.5 kPa).

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

These appliances are tested and approved for installation at elevations of 0-4500 ft (0-1372 m) above sea level using the standard burner oriﬁce sizes (marked with an "*" in Table 4). For elevations above 4500 ft, 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 orice to a smaller size

as regulated by the local authorities having jurisdiction and by the (USA) National Fuel Gas Code NFPA 54 - latest edition / ANSI Z223.1 or, in Canada, the CAN/CGA-B149.1

codes - latest edition. Install the appliance according to the regulations of the local authorities having jurisdiction and,

in the USA, the National Fuel Gas Code NFPA 54 - latest edition / ANSI Z223.1 or, in Canada, the CAN/CGA-B149.1 - latest edition.

Flame breadth, height and width will diminish 4% for every 1,000 feet of altitude. Gas Valve

Diagrams

. See Figure 1 for Millivolt models

and Figure 2 For Electronic Models.

Burner Oriﬁce Sizes

Elevation 0-4500 feet ( 0-1372 meters)

Model

Series

MPD33

MPD35

MPD40

MPD45

Table 4

Nat.Gas

drill size (inches)

#47 (0.0785")*

99K74 •

#44 (0.086")*

60J80 •

#38 (0.102") *

99K76 •

#37 (0.104")*

24M10 •

* Standard size installed at factory

• Part /Cat. Number

Propane

drill size (inches)

0.048"

99K78 •

#55 (0.052")*

19L52 •

0.062"

21L01 •

#52 (0.0635")*

37G00 •

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.

Main Gas Control Knob

OFF/PILOT/ON

OUT

Manifold Pressure Tap

Inlet Pressure Tap

Figure 1 - SIT Millivolt

Pilot Adjustment

HI/LO Variable Flame Height Adjustment

Screw

H T P T H T P T

Gas Valve

(from DFC Wire Harness)

Inlet (IN) Test Port

Manifold (OUT) Test Port

Orange Wire

(from DFC Wire

Harness)

Main Gas Inlet

3/8" NPT

Green Wire

Figure 2 - SIT Electronic Gas Valve

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS

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

• Install this appliance in accordance with

Massachusetts Rules and Regulations 248 C.M.R.

• Installation and repair must be done by

a plumber or gas ﬁtter licensed in the Commonwealth of Massachusetts.

• The exible gas line connector used shall

not exceed 36 (92 cm) 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 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.

Hi/Lo Flame Control Knob

Yellow Ground Wire (from DFC Wire Harness)

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LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

COLD CLIMATE INSULATION

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

If the ﬁreplace is being installed on a cement slab in cold climates, a sheet of plywood or other raised platform can be placed underneath to prevent conduction of cold transferring 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.

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.

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.

TOP VENT

APPLICATION

TOP VENT

INSTALLATION

VERTICAL VENT (Rear Vent Application)

HORIZONTAL VENT (Rear Vent Application with a chase)

RECESSED

REAR VENT

APPLICATION

TOP VENT

APPLICATION

TOP VENT

APPLICATION

HORIZONTAL VENT (Rear Vent Application without a chase)

Figure 3 - Typical Locations

REAR VENT

APPLICATION

TOP VENT

APPLICATION

TOP VENT

APPLICATION

HORIZONTAL VENT (Top Vent Application)

VERTICAL VENT (Top Vent Application)

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.

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 3).

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 3).

The location should also be free of electrical, plumbing or other heating/air conditioning ducting.

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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

Do not insulate the space between the appliance and the area above it (see Figure 8).

The minimum height from the base of the appliance to the underside of combustible materials used to construct a utility shelf in this fashion is shown in Figure 8.

The appliance must be mounted on a fully supported base extending the full width and depth of the unit. The appliance may be located on or near conventional construction materials. However, if installed on combustible materials, such as carpeting, vinyl tile or other combustible material other than wood ﬂooring, the appliance shall be installed on a metal or wood panel extending the full width and depth of the appliance.

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LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • 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, the current National Fuel Gas Code (ANSI-Z223.1) in the USA or the current standards of CAN/CGA-B149.1 in Canada.

Vertical Vent Termination Clearances

Terminate multiple vent terminations according to the installation codes listed above and Figures 4 and 5.

12"

(305mm)

Minimum

Figure 4 - Multiple Terminations

Vertical Vent Termination Clearances

The vent / air intake termination clearances above the high side of an angled roof are as

TERMINATION HEIGHTS FOR VENTS ABOVE

Horizontal Overhang

2 FT MIN.

Termination

Storm Collar

Flashing

Concentric

Vent Pipe

FLAT OR SLOPED ROOFS

Vent

*H = MINIMUM HEIGHT FROM ROOF TO LOWEST DISCHARGE OPENING OF VENT

2 FT MIN.

Lowest

Discharge

Opening

1 inch (25.4 mm) Minimum Clearance to Combustibles

Vertical

Wall

Roof Pitch is X/12

Figure 5 - Termination Heights for Vents Above Flat or Sloped Roofs

shown in the following chart:

Termination Heights For Vents

Above Flat Or Sloped Roofs Ref. NFPA 54 / ANSI Z223.1

Roof Pitch *H (ft) *H (m)

Flat-6/12 1.0 0.3 6/12-7/12 1.25 0.38 7/12-8/12 1.5 0.46 8/12-9/12 2.0 0.61

9/12-10/12 2.5 0.76 10/12-11/12 3.25 0.99 11/12-12/12 4.0 1.22 12/12-14/12 5.0 1.52 14/12-16/12 6.0 1.83 16/12-18/12 7.0 2.13 18/12-20/12 7.5 2.29 20/12-21/12 8.0 2.44

Horizontal Vent Termination Clearances

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 6. For projections exceeding 2-1/2" (64 mm), see Figure 6. For additional vent location restrictions, refer to Figure 7 on Page 7.

Horizontal Vent Termination Clearances

Combustible Projection

2-1/2”

or less in length

Combustible Projection greater

than 2-1/2” in length

Ventilated

Soffit

Unventilated

Soffit

18"

(457 mm)

12"

(305 mm)

Side Elevation View

Termination Kit

Figure 6 - Horizontal Vent Termination Clearances

(152 mm)

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.

Termination Kit

NOTE: See Figure 34 on Page 20 for the exterior wall recess

allowances of the square horizontal termination.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

EXTERIOR HORIZONTAL VENT TERMINATION CLEARANCE REQUIREMENTS

NOTE: Local Codes Or Regulations

* See Item D in the Text Below.

Exterior Wall

*18”

Horizontal Termination

Inside Corner

6”

Detail D

Ventilated Soffit

Fixed

Closed

Window

= Air Supply Inlet

Inside

Corner Detail

Operable

Window

= Vent Termination

= Area where Termination is not Permitted

May Require Different Clearances.

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

= 9” in U.S.



= 12” in Canada

3 ft.



3 ft.

Minimum Clearances Canadian Installation * US Installation **

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

B = Clearance to window or door that may be opened 6" (15.2 cm) for appliances < 10,000 BTU/hr (3kW),

C = Clearance to permanently closed window 12" (305 mm) recommended to prevent window conden-

D = Vertical clearance to ventilated sofﬁt located above the terminal within a horizontal distance of 18" (458 mm)

E = Clearance to unventilated sofﬁt 12" (30 cm) 12" (30 cm) F = Clearance to outside corner 5" (12.7 cm) 5" (12.7 cm) G = Clearance to inside corner 2" (5.08cm) minimum - SV4.5HT-2 •

H = Clearance to each inside of center line extended above meter / regulator assembly

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

J = Clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other appliance

K = Clearance to mechanical air supply inlet 6 feet (1.83 meters) * 3 feet (91 cm) above, if within 10 feet (3 m) horizontally** L = Clearance above paved sidewalk or paved

driveway located on public property M = Clearance under veranda, porch, deck or

balcony N = Depth of Alcove (Maximum) 6 feet (1.83m)* 6 feet (1.83m)** O = Clearance to Termination (Alcove) 6" (15.2mm)* 6" (15.2mm)** P = Width of Alcove (Minimum) 3 feet (91cm)* 3 feet (91cm)** Q = Clearance to Combustible Above (Alcove) 18" (457mm)* 18" (457mm)** * In accordance with the current CAN/CGA-B149.1 National Gas and Propane Installation Code.

** In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Codes. ‡ 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.

• 2" Clearance to Non-Combustibles for SV4.5HT-2 Only.

12" (30 cm) * 12" (30 cm) **

6" (15.2 cm) for appliances < 10,000 BTU/hr (3kW),

12" (30 cm) for appliances > 10,000 BTU/hr (3kW)

9" (23 cm) for appliances > 10,000 BTU/hr (3kW) and < 50,000 BTU/hr (15kW), 12" (30 cm) for appliances > 50,000 BTU/hr (15kW)**

9" (229 mm) recommended to prevent window con-

sation

densation

18" (458 mm) 18" (458 mm)

2" (5.08cm) minimum - SV4.5HT-2 •

6" (15.2cm) minimum - SV4.5HTSS •

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

6" (15.2 cm) for appliances < 10,000 BTU/hr (3kW), 12" (30 cm) for appliances > 10,000 BTU/hr (3kW)

6" (15.2cm) minimum - SV4.5HTSS •

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

6" (15.2 cm) for appliances < 10,000 BTU/hr (3kW), 9" (23 cm) for appliances > 10,000 BTU/hr (3kW) and < 50,000 BTU/hr (15kW), 12" (30 cm) for appliances > 50,000 BTU/hr (15kW)**

7 feet (2.13 m) ‡ 7 feet (2.13 m) ‡

12" (30 cm) * ‡ 12" (30 cm) ‡

Figure 7 - Exterior Horizontal Vent Termination Clearance Requirements

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 8

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

12 (305) MANTEL

10 (254) MANTEL

8 (203) MANTEL

6 (152) MANTEL

4 (102) MANTEL

(102)

(356)

(305)

(254)

2 (51) MANTEL

TOP OF APPLIANCE

(152)

NOTE - Hood shown as positioned in louvered front model. The hood position in the flush faced front model is lower than shown.

(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 (as detailed in Table 5), with the following exception: When

the unit is installed with one side ﬂush with a wall, the wall on the other side of the unit must not extend beyond the front edge of the unit. In addition, when the unit is recessed, the side walls surrounding

the unit must not extend beyond the front edge of the unit (see Figure 3).

MINIMUM CLEARANCES* Inches (millimeters)

Back 1/2 (13)

Sides 1/2 (13)

Top of Fireplace

Floor 0 (0)

From Bottom of Unit To Ceiling 64 (1626)

Vent 3 (76) Top* / 1 (25.4) Sides & Bottom

SERVICE CLEARANCES Feet (meters)

Front 3 feet (0.9 meters)

Table 5

*NOTE: 3" (75 mm) above any horizontal/inclined vent component.

**NOTE: See Page 10, Step 1 for clearance requirements to the nailing

ﬂange located at each side of the unit and any screw heads adjacent to it.

0 (0) from Spacers or Dimples

0 (0) from Spacers or Dimples **

3 (76)

0" (0 mm) with standoff(s) in vertical

position (see Figure 11)

Models

MPDT33 MPDR33

MPD35 45-3/4 (1162) 47-1/2 (1207) 35-1/4 (895) 35-1/4 (895) MPD40

MPD45

Shelf Above Fireplace With Rear Venting

Figure 8 -

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

Secure Vent

43-3/4 (1111) 45-1/2 (1156) 33-1/4 (845) 33-1/4 (845)

50-3/4 (1289) 52-1/2 (1334) 40-1/4 (1022) 40-1/4 (1022)

Do not insulate the space between the appliance and the area above it.

Shelf Height

(see table)

Shelf Height Minimum Clearances

Combustible Shelf Height - inches (millimeters)

Secure Flex

Do not insulate the space between the appliance and the area above it.

Shelf Above Fireplace With Top Venting

Secure Vent Secure Flex

Shelf Height

(see table)

Inches (millimeters)

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.

Shelf Height - To provide for the lowest possible shelf surface, use the

alternate rear vent outlet, the venting attached to the top vent should be routed in a way to minimize obstructions to the space above the appliance.

Do not insulate the space between the appliance and the area above it (see Figure 8). The minimum height from the base of the appliance to

the underside of combustible materials used to construct a utility shelf in this fashion is shown in Figure 8.

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 Figures 61 and 62 on Page 34). Non-combustible materials, such as surrounds and other appliance trim,

may be installed on the appliance face with these exceptions: they must not cover any portion of the removable glass panel or control compartment.

Vertical installation clearances to combustible mantels vary according to the depth of the mantel. See Figure 9. Mantels constructed of noncombustible materials may be installed at any height above the appliance opening; however, do not allow anything to hang below the ﬁreplace hood.

Minimum clearance requirements include any projections such as shelves, window sills, mantels, etc. above the appliance.

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

Figure 9 - Minimum Mantel Clearances

At 6" minimum side wall clearance, a combustible wall can project to any length.

(152)

Figure 10 - Minimum Distance to Side Wall

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Top View of

Fireplace

3-1/2

Combustible Materials Allowed In Shaded Area

(89)

“Safe Zone”

Combustible Walls shown in dark gray

Combustible materials may project beyond either side of the fireplace opening as long as they are kept within the shaded area illustrated here.

Inches (millimeters)

Page 9

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • 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. Open the two spring latches securing the glass door (under the ﬁrebox ﬂoor). Remove the door by tilting it outward at the bottom and lifting it up. Set the door aside, taking care to protect it from inadvertent damage.

See Removing The Glass Enclosure Panel

on Page 32.

5. Remove the log set from the ﬁrebox. Handle

logs carefully to prevent breakage.

6. 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 pages referenced in the following steps for detailed procedures.

Step 1. FRAMING (Page 10): Construct the appliance framing. Position the appliance within the framing and secure with nailing brackets.

IMPORTANT! Bend up the appropriate header

spacing standoffs for the drywall/finish material thickness to be used (see Figure 11).

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" and 5/8" framing depths (see Figure 11).

Step 2. ROUTING GAS LINE (Page 12): Route gas supply line to appliance location.

Step 3. PREPARING APPLIANCE VENT COLLAR

(MPD35/40/45 models with combined top/rear vent) (Page 13).

Step 4. INSTALLING VENT SYSTEM (Page 13): Install the vent system and exterior termination.

Step 5. FIELD WIRING (Page 25).

a. Millivolt Appliances - Install the operating

control switch (not factory provided). If installing the optional forced air circulating blower, bring in electrical service line.

b. Electronic Appliances - Field wire and install operating control switch.

Step 6. WIRING - OPTIONAL FORCED AIR BLOWER KIT (Page 26).

Step 7. CONNECTING GAS LINE (Page 26):

Make connection to gas supply. Step 8. VERIFYING APPLIANCE OPERATION

(Page 27).

Step 9. INSTALL VOLCANIC STONE, GLOWING EMBERS, AND LOGS (Page 28).

Step 10. INSTALLING GLASS DOOR ASSEMBLY (Page 32).

Step 11. BURNER ADJUSTMENTS (Page

32): Adjust burner to ensure proper ﬂame appearance.

Step 12. HOOD INSTALLATION (Page 34). Step 13. ATTACHING SAFETY-IN-OPERATION

WARNINGS (Page 35).

DETAILED INSTALLATION STEPS Step 1. FRAMING

Frame the appliance as illustrated in Figures 12 and 13 on Pages 11 and 12 (Figure 13

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 standoff 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.

Secure the ﬁreplace to the side framing members using the unit’s nailing ﬂanges - one top and bottom on each side of the ﬁreplace front. See Figure 11. Use 8d nails or their equivalent.

Bend up the appropriate header spacing top standoffs before installing the ﬁreplace.

Header Spacing Top Standoffs

(two pairs on front edge of firebox top)

Lift up outer pair for 1/2” finish materials

Side

Framing

NOTE: The nailing ﬂanges, combustible members, and screw heads 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 in this manual.

Figure 11 - Unit Secured to Framing by

Nailing Flange

IMPORTANT!

Lift up inner pair for 5/8” finish materials

Unit Nailing Flange

(No clearance to combustible framing is required)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 10

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

Framing

Model A B C D E

MPDT33

MPDR33

MPD35

MPD40

MPD45

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.

Fireplace

Model

MPDT33 62 45 64 49 MPDR33 61 53 64 55

MPD35 62 53 60 55 MPD40 67 59 67 60 MPD45 67 59 67 59

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

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

in. 45-1/4 40-1/4 26-11/16 44-3/4 16

mm 1149 1022 678 1137 406

Notes

Thermal Efﬁciency (%)

Natural Gas Propane

AFUE EnerGuide

(P4)

AFUE EnerGuide

(P4)

Based on CSA P.4.1-09

VENT FRAMING: TOP VENT WITH ONE 90° ELBOW

VENT FRAMING: REAR VENT WITH NO ELBOWS

1/2

10-1/2

(

)

267

(178)

5-1/8 (130)

(178)

5-1/8

(130)

Dimension “E” is the required framing depth when the finish material (drywall) thickness is 1/2 in. (13mm).

Framing should be constructed of 2x4 or larger lumber.

12-1/8

(308)

12-1/8

(308)

Inches (mm)

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 20).

Top View

Rear/Side

Framing

Spacers

Header

Spacing

Top

Standoffs

Notes: [1] MPD models have a top and rear vent. MPDR models

have a rear vent only. MPDT models have a top vent only. [2] Collars protrude one inch on MPDT33 and MPDR33 models.

Concentric Flue:

4-1/2” (114 mm);

Flue Combustion Air 7-1/2” (190 mm).

See Notes [1] and [2].

Front View

3 (76)

Gas Inlet (either

side and bottom)

Optional Electrical Inlet

Knockout requiring a

Field-Provided Junction

Box (either side)

1-3/8 (35)

6 (152)

Right Side View

1/2 (13)

See Note [2].

1-5/8 (42)

F (rear vent models only)

Electrical Inlet 2-3/4" x 2" (70 x 51 mm) Cover Plate with Knockout

Model A B C D E F G H J K L M N

MPD33

MPD35

MPD40

MPD45

in. 33-1/8 30-1/8 17 27-1/2 33-1/8 19-5/8 21-1/2 10-3/4 6-13/16 3 8-11/32 2-3/4 13

mm 841 765 432 699 841 498 546 273 173 76 212 70 330

in. 35-1/8 32-1/8 19 29-1/2 35-1/8 21-11/16 24-7/8 12-7/16 9 3 9 3 16

mm 892 816 483 749 892 551 632 316 220 76 220 76 406

in. 40-1/8 37-1/8 24 34-1/2 40-1/8 26-11/16 29-7/8 14-15/16 9 3 9 3 16

mm 1019 943 610 876 1019 678 759 379 220 76 220 76 406

in. 40-1/8 37-1/8 24 39-1/2 45-1/8 26-11/16 34-7/8 17-7/16 9 3 9 3 16

mm 1146 943 610 1003 1146 678 886 443 220 76 220 76 406

Figure 12 - Fireplace and Framing Speciﬁcations

Page 11

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

FIREPLACE FRAMING SPECIFICATIONS

Framing

Model A B C D E F

MPDT33

MPDR33

MPD35

MPD40

MPD45

NOTE:

• Rear Vent Applications in Corner Installations: The horizontal vent length

(from a to b) must not exceed 28 inches (711 mm).

• MPDT33 and MPDR33 Models: Dimensions A through F occur when one

45-degree elbow is connected directly to the appliance collar.

• MPD35, MPD40, and MPD45 Models: Dimensions D through F occur when

one 45-degree elbow is connected directly to the appliance collar.

in. 33-1/8 48-1/2 34-5/16 17-3/16 24-1/4 5

mm 841 1232 872 437 616 127

in. 35-1/8 57-1/2 40-5/8 19-3/16 28-3/4 6-1/8

mm 892 1461 1032 487 730 156

in. 40-1/8 61-3/16 43-11/32 19-3/16 30-11/16 7-7/8

mm 1019 1554 1101 487 779 200

in. 45-1/8 66-3/8 46-15/16 19-3/16 33-3/16 9-3/4

mm 1146 1686 1192 487 843 248

Figure 13 - Corner Framing with Horizontal Termination

Step 2. ROUTING GAS LINE

Route a 1/2" (13 mm) gas line to the left side of the appliance as shown in Figure 14. 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" shutoff valve. (See Step 7 on Page 26).

Never use galvanized or plastic pipe. Refer to Table 6 for proper sizing of the gas supply line, if black iron pipe is being used. Gas lines must be routed, constructed and made of materials that are in strict accordance with local codes and regulations. We recommend that a 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

Left Side Front

Corner of Fireplace

Framing

Pipe Coupling

(Recommended)

of materials, protection, sizing, locations, controls, pressure, sediment, and more. Certainly no one unfamiliar and unqualiﬁed should attempt sizing or installing gas piping.

Schedule 40 Pipe

Length (feet)

0-10 1/2" 3/8"

10-40 1/2" 1/2"

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

(76 mm)

Also see Figure 12.

Figure 14 - Route Gas Line

6-1/2"

(152 mm)

Table 6 - Schedule 40 Black Iron Pipe Inside Diameter

Proper Sizing of Gas Line

Properly size and route the gas supply line from the supply regulator to the area where the appliance is to be installed per requirements outlined in the National Fuel Gas Code, NFPA 54 - latest edition (USA) or CAN/CGA-B149.1

- latest edition (Canada).

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

MPD and MPDR units

MPD and MPDT units

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

Natural

Gas

Propane

Gas

7" (178 mm)

Notes:

• All appliances are factory-equipped with

a ﬂexible gas line connector and 1/2 inch shutoff valve (see Figure 47 on Page 27).

• 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 7 (Page 26).

• 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.

• Check with local building ofcial for local

code requirements.

IMPORTANT: If propane is used, be aware that if tank size is too small (i.e. under 100 lbs, if

this is the only gas appliance in the dwelling.

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

resulting in insufﬁcient fuel delivery (which

can result in sooting, severe delayed ignition

or other malfunctions). Any damage resulting

from an improper installation, such as this,

is not covered under the limited warranty.

Page 12

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

A vent restrictor may be needed when

TOP VENT SEAL AND COVER PLATE REMOVAL

REAR VENT SEAL AND COVER PLATE REMOVAL

Step 3. PREPARING APPLIANCE VENT COLLAR (MPD35/-40/-45 models with

combined top/rear vent)

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 15 for top vent usage and Figure 16 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. 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.

Reinstall and securely tighten all four cover plate screws. Re-secure the lintel to the rear wall of the ﬁrebox.

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 cap must remain securely installed on unused vent collar. Failure to do so could result in leakage of ﬂue products into living space.

Installation of Vent Restrictor

A vent restrictor may be needed with this appliance, install vent restrictor (provided) in the appliance top ﬂue outlet as shown in Figure 17 (MPDT33, MPD35, MPD40 and MPD45) or rear ﬂue outlet as shown in Figure 18 (MPD35, MPD40 and MPD45). It is held in

place by friction, only.

NOTE: The vent restrictor is included in the rebox.

WHEN USING THE TOP VENT

(OUTSIDE UNIT)

CABINET TOP

FIREBOX TOP

VENT

COVER PLATE

(INSIDE UNIT)

CROSS SECTION

GASKET

TOP VENT

KNOCKOUT

COVER PLATE SECURING SCREWS

Figure 15 - Top vent seal and cover plate

removal - MPD35/40/45 series models

(combined top and rear vent units)

WHEN USING THE REAR VENT

COVER PLATE

SECURING SCREWS

(INSIDE UNIT)

REAR VENT

CROSS SECTION

CAP AND GASKET

CABINET BACK

(OUTSIDE UNIT)

KNOCKOUT

Figure 16 - Rear vent seal and cover plate

removal - MPD35/40/45 series models

(combined top and rear vent units)

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 MPD35/40/45 and MPDT33 series models.

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

U-Shaped Vent Restrictor

Inner Fireplace Collar

Appliance Top

Vent Outlet

Figure 17 - Vent restrictor installation Top vent

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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 MPD35/40/45 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

APPLIANCE REAR

VENT OUTLET

U-SHAPED VENT RESTRICTOR

Figure 18 -Vent restrictor installation Rear vent

Select Venting System - Horizontal or Vertical

With the appliance secured in framing, 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 are shown on Pages 36 and 37.

Use only approved vent 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 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.

Step 4. INSTALLING VENT SYSTEM

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.

Page 13

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

lanimoN

0010

VERTICAL TERMINATION SYSTEMS (ROOF)

See Figure 19 and Figures 27 through 29

)sehcni(

on Page 17 and their associated Vertical Vent Tables, which illustrate the various vertical venting conﬁgurations that are possible for use with these appliances. Secure Vent applications are shown in these Figures; Secure

pipe may also be used. A Vertical Vent

Flex

pipe

Table summarizes 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.

Both these vertical vent systems terminate through the roof. The minimum vent height above the roof and/or adjacent walls is speciﬁed in ANSI Z223.1 (In Canada, the current CAN/ CGA-B149.1 installation code) by major building codes. Always consult your local codes for speciﬁc requirements. A general guide to follow is the Gas Vent Rule (refer to Figure 5 on Page 6).

Vertical (Straight) Installation

(Figure 19)

Determine the number of straight vent sections required. 4-1/2" (114 mm), 10-1/2" (267 mm), 22-1/2" (572 mm), 34-1/2" (876 mm) and 46 1/2" (1181 mm) net section lengths are available (see Tables on this page and Pages 36 and 37 - Vent Sections). Plan the vent lengths so that a joint does not occur at the intersection of ceiling or roof joists. Refer to the Vent Section Length Chart.

SV4.5CGV-1

Termination

Max. 40 ft (12.2 m)

SV4.5FA or SV4.5FB Flashing AND SV4.5SC Storm Collar

1 in (25.4 mm) Minimum Clearance to Combustibles

SV4.5VF Firestop/Spacer*

*When using Secure Flex, use Firestop/Spacer

SF4.5VF.

SV4.5L6/12/24/36/48 Vent Sections

sehcnitf

5.4573.0100001

957.0200002

5.01578.0010001

5152.1110002

5.91526.12100

1257.1020002

5.22578.1001001

5.52521.2120003

5.13526.2030003

5.43578.2000101

5.73521.3111003

5.34526.3021003

5457.3002002

5.64578.3000011

5.94521.4102003

1552.4100012

5.55526.4012003

7557.4001102

6652.5022004

5.76526.5003003

9657.5000202 2761030

5.37521.6100203

5.97526.6010203

1857.6000112

095.7021014

5.19526.7002013

3957.7000022 6981012

5.79521.8100023

2015.8200024

5.301526.8000303

80191003

4115.9020024

71157.9105006

5.811578.9110305

6215.01001304

5.031578.01101305

53152.11006006

8315.11000404

5.931526.11000033

5.241578.11100405

Table 7: 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

htgneLnoitceS

621426

noitceSteN

2/1-42/1-012/1-222/1-4

)sehcni(htgneL

tneVfothgie

noitceSlanimoN

O T A

/1-64

noitceStneVforebmuN

Q T

sehcnitf

44121100034

0515.21010034

5.451578.21110035

5.061573.31020035

5.271573.41000505

77157.41100506

38152.51010506

6815.51000044

5.091578.51100045

5.691573.61010045

5.502521.71011507

70252.71000606

5.112526.71100607

5.712521.81010607

5.922521.91001607

5.232573.91000055

73257.91100056

5.142521.02000707

6425.02100708 25212010708 46222001708 67232000808

97252.32000066

5.082573.32100809

5.382526.32100067

5.982521.42010067

5.103521.52001067

5.013578.52000909

5135.621009001

5.523521.72000077

0335.72100078 63382010078

54357.82000 01001

5.943521.921

27313000088

5.673573.13100089

5.973526.13000 11011

5.814578.43000099

32452.531000901

56457.83000

621426

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Q T Y

Model Effective Length

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

Table 8 - Effective Vent Length

Figure 19

Page 14

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

Vertical (Offset) Installation

Analyze the vent routing and determine the quantities of vent sections and number of elbows required. Refer to Vertical Vent Figures and Tables on Page 17 to select the type of vertical installation desired. Vent sections are available in net lengths of 4-1/2" (114 mm), 10-1/2" (267 mm), 22-1/2" (572 mm), 34-1/2" (876 mm) and 46 1/2" (1181 mm). Refer to the Vent Section Length Chart on Page 14 for an aid in selecting length combinations. Elbows are available in 90° and 45° conﬁgurations. Refer to Figure 23 for the SV4.5E45 and SV4.5E90 elbow dimensional speciﬁcations.

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 ﬁxed 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" (38 mm) to 7 1/2" (191 mm). The SV4.5LA is ﬁtted with a locking inclined channel end (identical to a normal vent section component) and a plain end with 3 pilot holes. Slip the plain 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" (25 mm) clearance to combustible materials for all vertical elements. Clearances for all horizontal elements are 3" (76 mm) on top, 1" (25 mm) on sides and 1" (25 mm) on the bottom.

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" x 10-1/2" (267 mm x 267 mm) inside dimensions, about this center mark (Figure 20).

B. Attach vent components to appliance

- Secure Vent

SV4.5 direct vent system components are unitized concentric pipe components featuring positive twist lock connections (see Figure 19). All of the appliances covered in this document are ﬁtted with collars having locking inclined channels.

Min. 10-1/2" (267 mm)

Roof Framing

Ceiling Framing

Min. 10-1/2" (267 mm)

Plumb Bob

Figure 20

The dimpled end of the vent components ﬁt over the appliance collar to create the positive twist lock connection.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 inlet of the four inclined channels on the collar (refer to Figure 21). 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 without the need for sealant or screws. If desired a #6 x 1/2" screw may be used at the joint, but it is not required as the pipe will securely lock when twisted.

NOTE: An elbow may also be attached to the appliance collar. Attach in the same manner as you would a vent section.

C. Attach vent components to each other

- Other vent sections may be added to the

previously installed section in accordance with the requirements of the vertical vent ﬁgures and tables. 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 21.

D. Install ﬁrestop/spacer at ceiling - When

using Secure Vent, use SV4.5VF ﬁrestop/spacer at ceiling joists; when using Secure Flex

, use SF4.5VF ﬁrestop/spacer. If there is living space above the ceiling level, the ﬁrestop/spacer must be installed on the bottom side of the ceiling. If attic space is above the ceiling, the ﬁrestop/ 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.

Remember to maintain 1" (25 mm) clearance to combustibles, framing members, and attic or ceiling insulation when running vertical chimney sections. Attic insulation shield (96K94) may be used to obtain the required clearances indicated here. See installation accessories table on Pages 36 and 37. The gap between the vent pipe and a vertical ﬁrestop can be sealed with non-combustible caulking.

E. Support the vertical vent run sections -

NOTE: Proper venting support is very important.

Support the vertical portion of the venting system every 8 feet (2.4m) above the ﬁreplace vent outlet. One method of support is by utilizing ﬁeld provided support straps (conventional plumber's tape). Secure the plumber's tape to the framing members with nails or screws. Loop the tape around the vent, securing the ends of the tape to the framing. If desired, sheet metal screws #6 x 1/2" length may be used to secure the support straps to the vent pipe. See Figure 22.

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 and dimple

Arrow

Appliance Collar or Vent Section

align.

Dimple

Locking Incline Channel

Connected Vent Sections

Arrow

Figure 21

Blocking

Support Straps (Plumber's tape)

8 feet (2.4 m)

Maximum

1/2 inch (12.7 mm) minimum clearance to combustibles

Figure 22

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 15

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

SV4.5E90

(90

Elbow)

8-1/8"

(206 mm)

Swivel Joint

(360

swivel)

4-13/16"

(122 mm)

SV4.5E45

(45

Elbow)

Swivel Joint

(360

swivel)

Storm Collar

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 possiblity of unlocking any of the previously connected vent sections.

See Figure 23.

Figure 23

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 5 ft (1.52 m) along horizontal/inclined vent runs using conventional plumber’s tape.

It is very important that the horizontal/inclined run be maintained in a straight (no dips), slightly elevated plane. The recommended incline is approximately 1/4" per foot (20 mm per meter) horizontal, in a direction away from the ﬁreplace. The rise per foot run ratios that

are smaller are acceptable all the way down to at or near level. Use a carpenter’s level to measure from a constant surface and adjust the support straps as necessary.

It is important to maintain the required clearances to combustibles: 1" (25 mm) at all sides for all vertical runs; and 3" (76 mm) at the top, 1" (25 mm) at sides, and 1" (25 mm) at the bottom for all horizontal/inclined runs.

H. Frame roof opening - Identify location for

vent at the roof. Cut and/or frame opening per Roof Framing Chart and Figure 24.

Framing Dimensions for Roof

Pitch C D

0/12

6/12

12/12

10-1/2"

(267 mm)

10-1/2"

(267 mm)

10-1/2"

(267 mm)

10-1/2"

(267 mm)

12"

(305 mm)

17-3/4"

(451 mm)

Figure 24

I. Install the roof ﬂashing - Extend the vent sections through the roof structure. Install the roof ﬂashing over the vent section and position such that the vent column rises vertically (use carpenters level) (Figure 25 ). Nail along perimeter to secure ﬂashing or adjust rooﬁng to overlap the ﬂashing edges at top and sides only and trim where necessary. Seal the top and both sides of the ﬂashing with waterproof caulking.

J. Install the storm collar - Install the storm collar, supplied with the ﬂashing, over the vent/ ﬂashing joint. See Figure 25. Loosen the storm collar screw. Slide collar down until it meets the top of the ﬂashing. Tighten the adjusting screw. Apply non-combustible caulking or mastic around the circumference of the joint to provide a water tight seal.

K. Install the vertical termination - The ﬁnal step involves installation of the SV4.5CGV-1 Vertical Termination. Extend the vent sections to the height as shown in the "Vertical vent termination section" on Page 6. The SV4.5CGV-1 Vertical Termination (Figure 26) installs in the exact same fashion as any other Secure Vent® section. Align the termination over the end of the previously installed section, adjusting the radial alignment until the four locking dimples of the termination are aligned with the inlets of the four incline channels of the last vent section. Push the termination down until it fully engages, then twist the termination clockwise running the dimples down and along the incline channels until they seat at the end of the channels.

Figure 26

If the vent system extends more than 5' (1.5 m) above the roof ﬂashing, stabilizers may be necessary. Additional screws may be used at section joints for added stability. Guide wires may be attached to the joint for additional support on multiple joint conﬁgurations.

Figure 25

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 16

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

SF4.5VF.

VERTICAL VENT FIGURES/TABLES

NOTE: Secure Vent® (rigid vent pipe) is shown in the ﬁgures; Secure Flex® (ﬂexible vent pipe) may also be used.

NOTE: It is very important that the horizontal/ inclined run be maintained in a straight (no dips), slightly elevated plane. The recommended incline is approximately 1/4" per foot (20 mm per meter) horizontal, in a direction away from the ﬁreplace. The rise per foot run ratios that are smaller are acceptable all the way down to at or near level.

NOTE: SV4.5VF (Secure Vent), SF4.5VF (Secure

) ﬁrestop/spacer must be used anytime

Flex vent pipe passes through a combustible ﬂoor or ceiling. SV4.5HF (Secure Vent), SF4.5HF (Secure Flex®)ﬁrestop/spacer must be used anytime vent pipe passes through a combustible wall.

NOTE: Two 45 degree elbows may be used in place of one 90 degree elbow. The same rise to run ratios, as shown in the venting ﬁgures for 90 elbows, must be followed if 45 degree elbows are used.

NOTE: An elbow is acceptable as 1 foot of vertical rise, except where an elbow is the

only vertical component in the system. (See Figure 36 on Page 21).

Ceiling Firestop/ Spacer SV4.5VF*

Max. 40 ft

(12.2 m)

*When using Secure Flex, use

Ceiling Firestop/ Spacer SF4.5VF.

TABLE A

H Maximum V Minimum

(meters)

feet feet

(meters)

2 (0.610) 1 (0.305)

4 (1.219) 2 (0.610)

6 (1.829) 3 (0.914)

8 (2.438) 4 (1.219)

V + H = 40 feet (12.2 meters) Max.

H = 8 feet (2.4 meters) Max.

Ratio V to H ratio is 1:2

This table shows a 1 (V) to 2 (H) ratio. For every 1 foot of (V) vertical, you are allowed 2 feet of (H) horizontal run, up to a maximum horizontal run of 8 feet.

Example: If 8 feet of (H) horizontal vent run is needed, then 4 feet minimum (V) vertical vent will be required.

Figure 28 - Rear Vent - ONE 90-DEGREE ELBOW

Ceiling Firestop/Spacer SV4.5VF*

Wall Firestop/Spacer

*When using Secure Flex, use Ceiling Firestop/Spacer SF4.5VF.

**When using Secure Flex, use Wall Firestop/Spacer SF4.5HF.

SV4.5HF**

Figure 29 - Top Vent - TWO 90-DEGREE ELBOWS

Ceiling Firestop/Spacer SV4.5VF*

*When using Secure Flex, use

Ceiling Firestop/Spacer

NOTE: Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (See Page 13).

TABLE B

H Maximum

feet

(meters)

(1.524)

(3.048)

(4.572)

(6.096)

V + V1+ H = 40 feet (12.2 m) Max.

H = 20 feet (6.096 meters) Max.

V Minimum

feet

Elbow Only

(meters)

(0.305)

(0.610)

(0.914)

(1.219)

Example: If 20 feet of (H) horizontal vent run is needed, then 4 feet minimum of (V) vertical vent will be required.

This table shows a 1 (V) to 5 (H) ratio. For every 1 foot of (V) vertical, you are allowed 5 feet of (H) horizontal run, up to a maximum horizontal run of 20 feet.

An elbow is acceptable as 1 foot of vertical rise except where an elbow is the only vertical component in the system. See Figure 36.

NOTE: Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (See Page 13).

A Vent Restrictor, as shown in Figure 17 on

Page 13, must be used in this application.

Figure 27 - Top Vent - STRAIGHT

WARNING

Under no circumstances, may separate sections of concentric ﬂexible vent pipe be joined together.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 17

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

VERTICAL VENT FIGURES/TABLES

(continued)

TABLE C

Maximum H Maximum V Minimum

(meters)

(0.610)

(1.219)

(1.829)

(2.438)

(meters)

feet feet feet

(1.524)

(3.048)

(4.572)

(6.096)

V + V1+ H + H1 = 40 feet (12.2 m) Max

H = 8 feet (2.438 meters) Max.

H + H1= 20 feet (6.096 meters) Max.

(meters)

(0.305)

(0.610)

(0.914)

(1.219)

Example: If 20 feet of (H) horizontal vent run is needed, then 4 feet minimum of (V) vertical vent will be required.

This table shows a 1 (V) to 5 (H) ratio. For every 1 foot of (V) vertical, you are allowed 5 feet of (H) horizontal run, up to a maximum horizontal run of 20 feet.

NOTE: Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (See Page 13).

Figure 30 - Rear Vent - THREE ELBOWS

Ceiling Firestop/Spacer SV4.5VF*

Wall Firestop/Spacer SV4.5HF**

*When using Secure Flex, use Ceiling Firestop/Spacer SF4.5VF.

**When using Secure Flex, use Wall Firestop/Spacer SF4.5HF.

Ceiling Firestop/Spacer SV4.5VF*

TABLE D

Maximum

H +

feet feet

(meters) (meters)

(1.524) Elbow Only

(1.524)

(3.048)

(4.572)

(6.096)

H + H1 = 20 feet (6.096 m) Max.

+ H + H1 = 40 ft. (12.192 m) Max.

V + V

V Minimum

(0.305)

(0.610)

(0.914)

(1.219)

Example: If 20 feet of (H) horizontal vent run is needed, then 4 feet minimum of (V) vertical vent will be required.

This table shows a 1 (V) to 5 (H) ratio. For every 1 foot of (V) vertical, you are allowed 5 feet of (H) horizontal run, up to a maximum horizontal run of 20 feet.

An elbow is acceptable as 1 foot of vertical rise except where an elbow is the only vertical component in the system. See Figure 36.

NOTE: Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (See Page 13).

Ceiling

Firestop/Spacer SV4.5VF*

Wall Firestop/Spacer SV4.5HF**

*When using Secure Flex, use Ceiling Firestop/Spacer SF4.5VF.

**When using Secure Flex, use Wall Firestop/Spacer SF4.5HF.

Figure 31: Top Vent - THREE ELBOWS

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 18

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

TYPICAL HORIZONTAL VENT INSTALLATION

HORIZONTAL (OUTSIDE WALL) TERMINATION SYSTEM

Figure 32, and Figures 35 to 41 on Pages 21 to 23 and their associated Horizontal

Vent Table illustrate the various horizontal venting conﬁgurations that are possible for use with these appliances. Secure Vent applications are shown in these ﬁgures; Secure

Flex

pipe may also be used. A Horizontal Vent Table summarizes 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. Both of these horizontal vent systems terminate through an outside wall. Building Codes limit or prohibit terminating in speciﬁc areas. Refer to Figure 7

on Page 7 for location guidelines. Secure Vent SV4.5 direct vent system compon-

ents are unitized concentric pipe components featuring positive twist lock connection, (refer to Figure 21 on Page 15). 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" (114 mm), 10-1/2" (267 mm), 22-1/2" (572 mm), 34-1/2" (876 mm) and 46-1/2". (1181 mm) net section lengths are available. It is recommended that you plan the venting so that a joint does not occur in the ceiling or roof joists. Allow for elbows as indicated in Figure 23 on Page 16.

Maintain a minimum 1" (25 mm) clearance to combustibles on the vertical sections. Clearances for the horizontal runs are; 3" (76 mm) on top, 1" (25 mm) on sides, and 1" (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 12 on Page 11. Cut and/or frame an opening, 10-1/2" x 12-1/8" (267 mm x 308 mm) inside dimensions, about this center.

C. Frame ceiling opening - If the vertical route is to penetrate a ceiling, use plumb line to locate the center above the appliance. Cut and/or frame an opening, 10-1/2" x 10-1/2" (267 mm x 267 mm) inside dimensions, about this center (refer to Figure 20 on Page 15).

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 21 on Page 15).

pipe

Building

Support

Framing

SV4.5E90

ertical

Rise

Support

Brackets

Elbow

Ceiling

Firestop/Spacer

Horizontal / Inclined Run

See Figure 24 on Page 15 for vertical vent section support.

Fireplace

Figure 32 - Typical Horizontal Vent Installation

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.

NOTE: An elbow may also be attached to the appliance collar. Attach in the same manner as you would a vent section.

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 21 on Page 15.

F. Install ﬁrestop/spacer at ceiling - When

using Secure Vent, use SV4.5VF ﬁrestop/spacer at ceiling joists; when using Secure Flex

, use SF4.5VF ﬁrestop/spacer. If there is living space above the ceiling level, the ﬁrestop/ spacer must be installed on the bottom side of the ceiling. If attic space is above the ceiling, the ﬁrestop/ 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.

Remember to maintain 1" (25 mm) clearance to combustibles, framing members, and attic or ceiling insulation when running vertical chimney sections.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

SV4.5HT-2 Termination

SV4.5L6/12/24/36/48

Vent Sections

Support bracket spacing every 5 ft (1.52 m)

Exterior Wall

SV4.5HT-2 Termination

Exterior Wall

G. Support the vertical run sections - On the vertical run, support the venting system every 8 feet (2.4m) 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. See Figure 22 on Page 15.

H. Change vent direction - 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 possiblity of unlocking any of the previously connected vent sections. See Figure 23 on

Page 16.

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 5 ft. (1.52 m) along horizontal/inclined vent runs using conventional plumber’s tape. See Figure 32, It is very important that the

horizontal/inclined run be maintained in a straight (no dips), slightly elevated plane. The recommended incline is approximately 1/4" per foot (20 mm per meter) horizontal, in a direction away from the ﬁreplace. The

rise per foot run ratios that are smaller are acceptable all the way down to at or near level. Use a carpenter’s level to measure from a constant surface and adjust the support straps as necessary.

Page 19

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

SV4.5HT-2

Termination

10-1/2”

(267mm)

7”

(178)

5-1/8”

(130 mm)

12-1/8”

(308 mm)

NOTE: Centerline of Vent Piping is NOT the Same as the Centerline of the Framed Opening.

6 to 48” Vent Section,

Telescopic vent section,

Elbow or Appliance Collar

Base of Appliance

3”

(76 mm)

1”

(25.4 mm)

Adaptor

SV4.5RCH

Siding

Stucco

1-1/4" Maximum Recess of the Square Termination into Exterior Finishing Material

Exterior Surface of

Framing

6” to 9-1/4”

(152 to 235 mm)**

Exterior Surface of Siding

Interior Surface of

Finished Wall

Maximum wall thickness

10” (254 mm)**

SV4.5HT-2

Square Termination

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

Last Vent Section. Use Telescopic Vent Section (SV4.5LA), If Necessary

Adaptor

SV4.5RCH

SV4.5HT-2

Square Termination

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

**For thicknesses greater than 10” see Table 8.

*Caulk

J. Assemble vent run to exterior wall - If not previously measured, locate the center of the vent at the exterior wall. Prepare an opening as described in Step B. Assemble the vent system to point where the terminus of the last section is within 7" (178 mm) to 11-1/4" (286 mm) inboard of the exterior surface to which the SV4.5 HT termination is to be attached, see Figure 34. 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 34, refer to Table 9 on Page 21. This table lists 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 termination) to the vent section or telescoping vent section), elbow or appliance collar as shown in Figure 33 in the same manner as any SV4.5 vent component (refer to Step E).

L. Install Firestop/Spacer at exterior wall

- When using the square termination, install

SV4.5HF (Secure Vent

Flex

) Firestop/Spacer over the opening at the exterior side of the framing, long side up, with the 3 inch spacer clearance at the top as shown in Figure 33, and nail into place (the Firestop/ Spacer may also be installed over the opening at the interior side of the framing).

M. Install the desired termination

1. Install the square termination (SV4.5HT-2 or SV4.5HTSS) - For the last step , from

outside the exterior wall, slide the collars of the termination onto the adaptor (the outer over the outer and the inner inside the inner) 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 horizontal termination

must not be recessed into the exterior wall or siding by more than the 1-1/4" (32 mm) as

shown in Figure 34. SVHRK Snorkel Cap - The snorkel cap is

designed to be ﬁtted into a basement window

box. The SVHRK cap is for use with ex vent.

The vertical distance between the inlet and outlet of the cap is 28" (711 mm).

IMPORTANT: The vent termination is hot while in operation and for a period of time following the use of the ﬁreplace. To prevent contact with hot surfaces, we recommend the use of a Termination Guard. See Page 36. This can be purchased at your local dealer.

), SF4.5HF (Secure

To help minimize water inﬁltration it is recommended that the Firestop/Spacer (SV4.5HF) be installed on the exterior side of the wall.

See Figure 12 on Page 10 for Min. Distance to Base of Appliance.

Figure 33 - Installing the Square Horizontal Termination (SV4.5HT-2)

** For thicknesses greater than 10" (254mm) see Table 9.

Figure 34 - Venting Connection and Exterior Wall Recessing of the Horizontal Square

Termination (SV4.5HT-2)

Horizontal terminations have been designed to perform in a wide range of weather conditions. Our terminations meet or exceed industry standards.

When selecting the locations of your horizontal terminations, do not place the termination where water from eaves and adjoining rooﬂines may create a heavy ﬂow of cascading water onto the termination cap. If the cap 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.

Take care to carefully follow the installation instructions for the termination, including the use of silicone caulking where required.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 20

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

HORIZONTAL VENT FIGURES/TABLES

NOTE: Secure Vent® components (rigid vent pipe and terminal) are shown in the ﬁgures; Secure Flex® components (ﬂexible vent pipe and terminal) may also be used.

NOTE: Two 45 degree elbows may be used in place of one 90 degree elbow. The same rise to run ratios, as shown in the venting ﬁgures for 90 elbows, must be followed if 45 degree elbows are used.

in a direction away from the ﬁreplace. The rise per foot run ratios that are smaller are acceptable all the way down to at or near level.

NOTE: SV4.5VF (Secure Vent

), SF4.5VF (Secure Flex) ﬁrestop/spacer must be used anytime vent pipe passes through a combustible ﬂoor or ceiling. SV4.5HF (Secure Vent), SF4.5HF (Secure Flex) ﬁrestop/spacer must be used anytime vent pipe passes through a combustible wall.

WARNING

Under no circumstances, may separate sections of concentric ﬂexible vent pipe be joined together.

Venting Components Required for Various Exterior Wall Thick-

nesses, when using Typical Termination Kits

Vent Components Required Exterior Wall Thickness - in. (mm)

Termination Kit Only 6 to 9-1/4 (152 to 235)

Termination Kit and 6" Vent

Section (SV4.5L6)

Termination Kit and 12"

Vent Section (SV4.5L12)

Termination Kit and

Telescopic Section (SV4.5L12)

Table 9

10-3/4 to 14 (2733 to 356)

16-3/4 to 20 (426 to 508)

11-3/4 to 20 (299 to 508)

NOTE: See Figure 34 showing wall thickness range

when using SV4.5HT-2 termination kit.

TABLE F

H Maximum V Minimum

(meters)

feet

(0.914)

**When using Secure Flex, use Wall Firestop/ Spacer SF4.5HF.

Square termination (SV4.5HT-2) shown.

See Table 9 as an aid in venting component selection for a particular range of exterior wall thicknesses.

feet

Elbow Only

(meters)

NOTE: Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (See Page 13).

Wall Firestop/ Spacer SV4.5HF**

Figure 36 - Top Vent - ONE 90-DEGREE ELBOW - ELBOW CONNECTION AT APPLIANCE

TABLE G

H Maximum

(meters)

feet feet

(1.524)

V Minimum

(meters)

1(0.305)

10 (3.048) 2 (0.610)

15 (4.572) 3(0.914)

20 (6.096) 4 (1.219)

V + H = 40 feet (12.2 m) Max.

H = 20 ft. (6.096 m) Max.

Example: If 20 feet of (H) horizontal vent run is needed, then 4 feet minimum of (V) vertical vent will be required.

This table shows a 1 (V) to 5 (H) ratio. For every 1 foot of (V) vertical, you are allowed 5 feet of (H) horizontal run, up to a maximum horizontal run of 20 feet.

H = 28 in. (711 mm) Maximum.

Wall Firestop/ Spacer

7 in

(178 mm)

Only the square termination (SV4.5HT-2) may be used.

See Table 9 as an aid in venting component selection for a particular range of exterior wall thicknesses.

Figure 35 - Rear Vent - NO ELBOWS

SV4.5HF**

**When using Secure Flex, use Wall Firestop/Spacer SF4.5HF.

Wall Firestop/ Spacer SV4.5HF**

*When using Secure Flex, use Ceiling Firestop/Spacer SF4.5VF.

**When using Secure Flex, use Wall Firestop/Spacer SF4.5HF.

Square termination (SV4.5HT-2) shown.

See Table 9 as an aid in venting component selection for a particular range of exterior wall thicknesses.

NOTE: Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (See Page 13).

Figure 37 - Top Vent - ONE 90-DEGREE ELBOW - ELBOW CONNECTION NOT DIRECTLY AT APPLIANCE

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Ceiling

Firestop/

Spacer

SV4.5VF*

Page 21

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

HORIZONTAL VENT FIGURES/TABLES (continued)

Ceiling Firestop/Spacer

SV4.5VF*

Wall Firestop/ Spacer

SV4.5HF**

*When using Secure Flex , use Ceiling Firestop/Spacer SF4.5VF.

**When using Secure Flex, use Wall Firestop/Spacer SF4.5HF.

Square termination (SV4.5HT-2) shown.

TABLE H

Maximum H Maximum

(meters)

feet

(1.524)

(3.048)

(4.572)

(6.096)

V + H + H1 = 40 feet (12.2 m) Max.

H = 8 feet (2.438 meters) Max.

H + H1= 20 feet (6.096 meters) Max.

(meters)

feet

2 (0.610) 1 (0.305)

4 (1.219) 2 (0.610)

6 (1.829) 3 (0.914)

8 (2.438) 4 (1.219)

V Minimum

(meters)

feet

Example: If 20 feet of (H) horizontal vent run is needed, then 4 feet minimum of (V) vertical vent will be required.

This table shows a 1 (V) to 5 (H) ratio. For every 1 foot of (V) vertical, you are allowed 5 feet of (H) horizontal run, up to a maximum horizontal run of 20 feet.

See Table 9 on Page 21 as an aid in venting component selection for a particular range of exterior wall thicknesses.

NOTE: Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (See Page 13).

Figure 38 - Rear Vent - TWO 90-DEGREE ELBOWS

Wall Firestop/Spacer

SV4.5HF**

*When using Secure Flex, use Ceiling Firestop/Spacer SF4.5VF.

**When using Secure Flex, use Wall Firestop/Spacer SF4.5HF.

Wall Firestop/Spacer

SV4.5HF**

Ceiling Firestop/Spacer

SV4.5VF*

Square termination (SV4.5HT-2) shown.

See Table 9 on Page 21 as an aid in venting component selection for a particular range of exterior wall thicknesses.

NOTE: Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (See Page 13).

Figure 39 - Top Vent - TWO 90-DEGREE ELBOWS

TABLE J

+ H

Maximum

(meters)

feet

(0.914) Elbow Only

(1.524)

(3.048)

(4.572)

(6.096)

V +H+ H1 = 40 feet (12.2 m) Max.

+ H1 = 20 ft. (6.096 m) Max.

V Minimum

(meters)

feet

1 (0.305)

2 (0.610)

3 (0.914)

4 (1.219)

Example: If 20 feet of (H) horizontal vent run is needed, then 4 feet minimum of (V) vertical vent will be required.

This table shows a 1 (V) to 5 (H) ratio. For every 1 foot of (V) vertical, you are allowed 5 feet of (H) horizontal run, up to a maximum horizontal run of 20 feet.

An elbow is acceptable as 1 foot of vertical rise except where an elbow is the only vertical component in the system. See Figure 36.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 22

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

HORIZONTAL VENT FIGURES/TABLES (continued)

*When using Secure Flex , use Ceiling Firestop/Spacer SF4.5VF.

**When using Secure Flex, use Wall Firestop/Spacer SF4.5HF.

Square termination (SV4.5HT-2) shown.

See Table 9 on Page 21 as an aid in venting component selection for a particular range of exterior wall thicknesses.

NOTE: Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (See Page 13).

Wall Firestop/Spacer SV4.5HF**

Ceiling

Firestop/Spacer

SV4.5VF*

TABLE K

+ H1+ H

feet feet feet

Maximum

(meters)

H Maximum

(meters)

V Minimum

(meters)

5 (1.524) 2 (0.610) 1 (0.305)

10 (3.048) 4 (1.219) 2 (0.610)

(4.572)

6 (1.829) 3 (0.914)

20 (6.096) 8 (2.438) 4 (1.219)

V + H + H1+ H2 = 40 feet (12.2 m) Max.

H = 8 feet (2.438 meters) Max.

H + H1+ H2= 20 feet (6.096 meters) Max.

Example: If 20 feet of (H) horizontal vent run is needed, then 4 feet minimum of (V) vertical vent will be required.

This table shows a 1 (V) to 5 (H) ratio. For every 1 foot of (V) vertical, you are allowed 5

feet of (H) horizontal run, up to a maximum horizontal run of 20 feet.

Figure 40 - Rear Vent - THREE 90-DEGREE ELBOWS

Wall Firestop/Spacer SV4.5HF**

Square termination (SV4.5HT-2) shown.

See Table 9 on Page 21 as an aid in venting component selection for a particular range of exterior wall thicknesses.

NOTE: Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (See Page 13).

Figure 41 - Top Vent - THREE 90-DEGREE ELBOWS

*When using Secure Flex, use Ceiling Firestop/Spacer SF4.5VF.

**When using Secure Flex, use Wall Firestop/Spacer SF4.5HF.

Ceiling Firestop/Spacer

SV4.5VF*

Wall Firestop/Spacer SV4.5HF**

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

TABLE L

H Maximum

(meters)

feet

(1.524)

Example: If 20 feet of (H) horizontal vent

(3.048)

(4.572)

(6.096)

+ H1 = 20 feet (6.096 m) Max.

+ V+H+ H = 40 ft. (12.192 m) Max.

V Minimum

feet

Elbow Only

run is needed, then 4 feet minimum of (V) vertical vent will be required.

This table shows a 1 (V) to 5 (H) ratio. For every 1 foot of (V) vertical, you are allowed 5 feet of (H) horizontal run, up to a maximum horizontal run of 20 feet.

An elbow is acceptable as 1 foot of vertical rise except where an elbow is the only vertical component in the system. See Figure 36.

(meters)

(0.305)

(0.610)

(0.914)

(1.219)

Page 23

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

5 in. (127 mm) Radius Minimum

Flexible Vent Section

GEAR CLAMPS

Adaptor

(SV4.5RF)

Apply ONLY MIL-PAC BLACK HIGH TEMPERATURE SEALANT (Catalog No. 10K81) to the outside surface of both collars of the adaptor (be especially careful to fill the grooves of the outer collar to be covered by the flexible pipe) and slide flexible pipe over inner and outer adaptor collars.

NOTE: OUTER PIPE IS PULLED AWAY TO SHOW THE DETAIL OF THE INNER PIPE

FLEX VENT

1-3/4 in. (44 mm) Flexible Pipe and

Adaptor Outer Collar Overlap

1-3/4 in. (44 mm) Flexible Pipe and

Adaptor Inner Collar Overlap

SECURING SCREW

(3 PLACES EQUALLY SPACED

JUST BELOW GEAR CLAMP)

Attach Adaptor to Appliance

Collar, or Secure Vent Sections

SECURING SCREW

(3 PLACES EQUALLY SPACED

JUST BELOW GEAR CLAMP)

VERTICAL OR HORIZONTAL VENTING USING

SECURE FLEX

Secure Flex

be used in any venting application where rigid

Secure Vent

can be used. All restrictions, clearances and allowances that pertain to the rigid piping apply to the ﬂexible venting. Secure Flex kits may not

be modiﬁed; also, under no circumstances may separate sections of ﬂex pipe be joined together. Secure Flex kits may be added to the end of a vent run made up of rigid Secure Vent (SV4.5) vent sections provided that

doing so does not violate any of the venting length, height, routing, horizontal to vertical ratio requirements or clearance considerations detailed in this manual.

Secure Flex kits come with an included adaptor that can be ﬁtted to the appliance collar or the inclined channel end of the last Secure Vent (SV4.5) vent section in a rigid system in the exact same fashion as any other Secure Vent section. Align the dimpled end of the adaptor over the previously installed section or appliance collar, adjusting the radial alignment until the four locking dimples of the adaptor are aligned with the inlets of the four incline channels of the last vent section or collar. Push on the adaptor until it fully engages, then twist the adaptor clockwise running the dimples down and along the incline channels until they seat at the end of the channels.

Attach the ﬂexible vent to the adaptor as follows (see Figure 42):

A. Install the Inner Flex Pipe

1. Install the small gear clamp loosely around

the inner ﬂexible vent pipe, push it back out of the way.

2. Apply a bead of Mill-Pac Black (700°F) high temperature sealant - Catalog No. 10K81) to

the inner adaptor collar, approximately 1/2 inch from the end.

3. Pull and extend the inner ﬂexible vent pipe.

4. Slide the inner ﬂex pipe over the adaptor

collar. Ensure the ﬂexible vent pipe completely engages the adaptor collar to a distance of 1 3/4 inches from the end, and that it is free from damage or tears.

5. Slide the gear clamp down and tighten it fully to secure the ﬂexible vent to the adaptor inner collar approximately 3/4 inch from the end of the ﬂex.

6. Install three screws 120 degrees apart through the ﬂexible vent pipe and into the adaptor collar just below the gear clamp to provide additional security to the connection.

B. Install the Outer Flex Pipe

1. Install the large gear clamp loosely around

the outer ﬂexible vent pipe, push it back out of the way.

venting kits and components may

(SV4.5) direct vent components

KITS AND COMPONENTS

Figure 42

2. Apply a bead of Mill-Pac Black (700°F) high temperature sealant - Catalog No. 10K81) to

the outer adaptor collar; to the grooves of the collar which extend approximately 1 inch from the end and to the ﬂat surface, approximately 1 3/8 inches from the end.

3. Pull and extend the outer ﬂexible vent pipe.

4. Slide the outer ﬂex pipe over the adaptor

collar. Ensure the ﬂexible vent pipe completely engages the adaptor collar to a distance of 1 3/4" from the end, and that it is free from damage or tears.

5. Slide the gear clamp down and tighten it fully to secure the ﬂexible vent to the adaptor outer collar approximately 3/4 inch from the end of the ﬂex.

6. Install three screws 120 degrees apart through the ﬂexible vent pipe and into the adaptor collar just below the gear clamp to provide additional security to the connection.

C. Route Flex Vent

Ensure that the ﬂex vent is properly routed to provide the required clearance. Do Not allow the ﬂexible vent to bend in a radius tighter than 5" (127 mm). Refer to Figure 43. Place the internal ﬂex vent spacers evenly and avoid kinking the inner pipe. Support horizontal sections of ﬂex vent with metal straps at 2 ft (0.61 m) intervals.

D. Install Firestop/Spacers at ceilings and walls

When Secure Flex penetrates a wall or ceiling, a ﬁrestop/spacer is required: use the SF4.5 VF ﬁrestop/spacer for ceilings and the SF4.5 HF ﬁrestop/spacer for walls.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

See the appropriate sections and ﬁgures shown throughout the venting section for their installation requirments.

Figure 43

E. Attach Flex Vent to Termination Secure Flex components can be purchased

separately and attached to bulk lengths of Secure Flex ﬂexible tubing cut to size at the job site. Secure the ﬂexible vent to the Secure Flex terminations in the same manner (see Figure 42) as it was attached to the adaptor.

NOTE: Secure Flex vent must be attached to Secure Flex terminations only. DO NOT

substitute Secure Vent terminations or

the Secure Vent adaptor for Secure Flex components. The collars of Secure Flex

terminations and adaptors have a different circumference than what is used with the

Secure Vent pipe. Additionally, Secure Flex components have an extended length center tube for use in attaching the exible vent.

Page 24

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

JUNCTION BOX

Step 5. FIELD WIRING

CAUTION

The ground supply lead must be connected to the wire attached to the green ground screw located on the outlet box (see wiring diagrams). 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 National Electrical Code, ANSI/NFPA 70-latest edition (in Canada, the current CSA C22.1 Canadian Electrical Code).

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.

BATTERY HOLDER

AC/DC POWER ADAPTOR

120V AC

HOT

NEUTRAL

GROUND

LIMIT SWITCH

B-VENT MODELS

ONLY

BL = BLUE G = GREEN O = ORANGE W = WHITE Y = YELLOW

SCHEMATIC REPRESENTATION ONLY

WIRING COLOR CODE

P/N 580491-01

OPTIONAL

REMOTE RECEIVER

ON/OFF SWITCH

WALL SWITCH

B = BLACK BR = BROWN GY = GRAY PU = PURPLE R = RED

Figure 45 - Wiring Diagram - Electronic Gas Valves

APPLIANCE- MOUNTED ON/OFF SWITCH (OPTIONAL)

BK/W(1)

WALL-MOUNTED ON/OFF SWITCH (OPTIONAL) THERMOSTAT (OPTIONAL)

WALL MOUNTED CONFIGURATION FOR FAN SWITCH (OPTIONAL)

(OPTIONAL)

BK/W(1)

FAN

THERMOPILE

TP-TH

JUNCTION BOX

GAS VALVE

Figure 44 - Wiring Diagram - Millivolt

Gas Valves

ELECTRONIC PILOT ASSEMBLY

HOOD

PROFLAME VALVE

PILOT TUBE

SPARK WIRE CABLE

PILOT GROUND WIRE

G O

PROFLAME DFC BOARD

OPTIONAL CPI SWITCH OFF (O) = INTERMITTENT PILOT MODE ON (-) = STANDING PILOT MODE

BLACK

IGNITER ROD

FLAME SENSOR

B PILOT SENSOR CABLE

DFC WIRE HARNESS

Refer to Section A for millivolt appliances and Section B for electronic appliances. The gas valve is set in place and pre-wired at the factory on both models.

A. Millivolt Wiring (see Figure 44)

Millivolt units are not provided with any factory-installed controls; therefore, one of the optional control switches is required to operate the unit (ON/OFF Wall Switch, UnitMountable ON/OFF Switch*, Thermostat, Remote Control). See the ﬁreplace Care and Operation Instructions for details.

[*If using a Unit-Mountable ON/OFF Rocker Switch with an optional Style View Door, mount the Rocker Switch on the door instead of the unit.]

1. If installing an ON/OFF wall switch or

thermostat, mount it in a convenient location on a wall near the ﬁreplace.

2. Wire the control switch within the millivolt

control circuit using the 15 feet of 2

120 V

conductor wire supplied with the unit.

NOTE: The supplied 15 feet of 2 conductor

wire has one end of each conductor connected to the gas valve circuit and the other end of each conductor placed loose inside the bottom compartment.

CAUTION

In millivolt systems, do NOT connect a Wall Switch to a 120V power supply.

B. Electronic Wiring (Figures 45 & 46)

One of the following optional controls also may be used: ON/OFF Wall Switch, Thermostat, Remote Control (see fireplace Care and Operation Instructions for details.).

NOTE: Electronic models must be connected to the main power supply.

1. Route a 3-wire 120Vac 60Hz 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’s securing screws (see Figure 12, Page 11).

3. Remove the cover plate knockout; then

feed the power supply wire through the knockout opening and into the unit junction box.

4. See Figures 45 & 46. Connect the black power supply wire to the lower outlet’s red pigtail lead.

Connect the white power supply wire to the

outlet’s common terminal.

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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 25

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

BLOWER CONTROL CIRCUIT WIRING

NOTE: Remote receiver should be located in the wall, or if installed in the control compartment, pulled all the way forward and completely to the left or right against the corner posts.

6. If wall-mounted ON/OFF control or

thermostat is to be used, mount it in a convenient location on a wall near the ﬁreplace.

7. If an optional control is to be used, wire it in

the low voltage circuit as shown in Figure

45.

NOTE: The supplied 15 feet of 2 conductor wire has one end of each conductor connected to the gas valve circuit and the other end of each conductor placed loose inside the bottom compartment.

8. After the wiring is complete, replace the

cover plate.

WARNING

Electronic models of these appliances are equipped with a threeprong (grounding) plug utilized in connecting the electronic components to the junction box in the lower compartment. This grounding plug provides protection against shock hazard and should be plugged directly into the properly grounded threeprong receptacle. DO NOT cut or remove the grounding prong from the plug.

Step 6. WIRING - OPTIONAL FORCED AIR BLOWER KIT

FBK-100 and FBK-200 Kits

(See Figure 46)

An electrical outlet box is provided for the installation of the FBK-100, FBK-200 forced air blower kits. Electrical power must be provided to this box to operate these blowers. Install the blower kits according to the installation instructions provided with the kits.

120V, 60HZ, 1PH

neerG - dnuorG

etihW - lar

t ueN

Black

White

Green

Plug blower into this receptacle

Blower

Ground

Figure 46 - Junction Box Wiring

FBK-250 Blower Kit

(See Figure 46)

An electrical outlet box is provided for the installation of the FBK-250 forced air blower kit. Electrical power must be provided to this box to operate these blowers. Install the blower kit according to the installation instructions provided with the kit.

NOTE: The tab connecting the receptacles of the outlet box must be broken in FBK-100 and FBK-200 blower kit applications. See Figure 46.

* Wall-mounted ON/ OFF Blower Switch or Variable Speed Control Switch.

120 VAC - Black

Junction Box

Tab Intact

Field Wired

Factory Wired

Tab Broken

Red

Hot Side of Receptacle

Neutral Side of Receptacle

Green Ground Screw

Step 7. CONNECTING GAS LINE

Make gas line connections. All codes require a shut-off valve mounted in the supply line. Figure 47 illustrates two methods for connecting the gas supply. The ﬂex-line method is acceptable in the U.S., however, Canadian requirements vary depending on locality. Installation must be in compliance with local codes.

These appliances are equipped with a gas ﬂex line for use (where permitted) in connecting the unit to the gas line. A gas ﬂex line is provided to aid in attaching the direct vent appliance to the gas supply. The gas ﬂex line can only be used where local codes permit. Refer to Figure 47 for ﬂex line description. The ﬂex line is rated for both natural and propane gas. A manual shut off valve is also provided with the ﬂex line.

The gas control valve is located in the lower control compartment.

To access the valve open the lower control compartment door (see Figure 48 ) by pushing in the right top corner of the door. (The door is hinged at the bottom.) Remove the bottom compartment door by sliding the hinge pin, located at the door’s left side, to the right until it disengages from the left corner post hole. Pull the door diagonally to the left, away from the ﬁreplace.

The millivolt control valve has a 3/8" (10 mm) NPT thread inlet port. The electronic control valve has a 1/2" (13 mm) NPT thread inlet port and is ﬁtted with a 1/2" x 3/8" (13 mm x 10 mm) NPT ﬁtting.

Secure all joints tightly using appropriate tools and sealing compounds (ensure propane resistant compounds are used in propane applications). Optional: Seal around the gas line to prevent cold air leakage. Gas line holes and other openings can be caulked or stuffed with unfaced ﬁberglass insulation.

All codes require a shut-off valve mounted in the supply line. The orientation of the shut-off valve should face the front. Figure 47 illustrates two methods for connecting the gas supply. A sediment Trap is recommended to prevent moisture and debris in the gas line for damaging the valve.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 26

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

Gas Stub

1/2" x 3/8" Flare

Shut-Off Valve

3/8" Flex Tubing

3/8" NPT x 3/8"

Flare Fitting

3/8" Nipple

3/8" Union

3/8" Close Nipple

3/8" Shut-Off Valve

1/2" x 3/8"

Reducer

Gas Valve

Optional Gas Flex Line Connector

Thermocouple

Hood Igniter Rod

Thermopile

Pilot Nozzels

3/8”

(9 mm)

Min

Figure 47 - Gas Connection

Millivolt Appliance Checkout

The pilot ﬂame should be steady, not lifting or ﬂoating. Flame should be blue in color with traces of orange at the outer edge.

The top 3/8" (10 mm) at the pilot generator (thermopile) and the top 1/8" minimum (tip) of the quick drop out thermocouple should be engulfed in the pilot ﬂame.

The ﬂame should project 1" (25 mm) beyond the hood at all three ports (see Figure 49). Replace logs if removed for pilot inspection.

To light the burner; turn “ON” the remote wall switch and rotate the gas valve control knob counterclockwise to the “ON” position (“ON” will be at the top side of the valve).

TEST ALL CONNECTIONS FOR GAS LEAKS (FACTORY AND FIELD)

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

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

B. Brush all joints and connections with the gas

C. When the gas lines are tested and leak free,

Main Gas Shut-Off Valve

Gas Valve

(Optional) Burner ON/OFF Switch

Figure 48 - Millivolt Gas Valve - Lower Control Compartment

Step 8. VERIFYING APPLIANCE OPERATION

With gas line installed, run initial system

WARNING

Never use an open ﬂame to check for leaks.

instructions label in the control compartment or in the Care and Operation Instructions manual).

leak test solution to check for leaks. If bubbles are formed, or gas odor is detected, turn the gas control knob (off/pilot/on) to the “OFF” position (millivolt units), or turn the receiver or remote control to the “OFF” position (electronic units). Either tighten or refasten the leaking connection, then retest as described above.

be sure to rinse off the leak testing solution.

checkout before closing up the front of the unit. Follow the pilot lighting instructions provided in the Care and Operation Instruc- tions. For piezo igniter location on millivolt appliances, see Figure 48.

NOTE: Lighting Instructions are also found on the literature tag tied to the gas piping next to the gas valve. To access the tag, open the lower control compartment door (Figure 48) by pushing in simultaneously the left and right top corners of the door (the door is hinged at the bottom). Remove the bottom compartment door by sliding the hinge pin, located at the door’s left side, to the right until it disengages from the left corner post hole.

When ﬁrst 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.

Piezo

Door Latch

Figure 49 - Millivolt Pilot

Electronic Appliance Checkout

To light the burner, turn ‘ON’ the wall or remote control switch. Ensure the igniter lights the pilot. The pilot ﬂame should engulf the ﬂame rod as shown in Figure 50.

Ignitor

Igniter

Pilot

Pilot Hood

Hood

Flame Rod

Sensor

(sensor)

Figure 50 - Electronic Pilot

Page 27

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

Glowing Embers

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

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 accord-

ing 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.

Figure 52 - Glowing Ember Placement

NOTE: Turn off all electricity to the appliance before you install volcanic stone, embers and logs.

Step 1. Remove the appliance front door (see Removing Glass Encloslure panel on Page 32.

Step 2. Install decorative volcanic stone -

Sprinkle the decorative volcanic stone in a pleasing pattern. The volcanic stone should be placed directly on top of the ﬁrebox bottom, along the front and to the back at the right and left sides of the burner. Position any optional ceramic ﬁber liners before placing the stone. Logs should be positioned after the volcanic stone.

NOTE: This appliance is provided with enough Glowing Embers for several applications, do not feel compelled to use all that is in a new bag. For best glowing effect, replace the ember material annually. Replacement Glowing Embers are available (Catalog Number 88L53).

Glowing Embers

Separate into Quarter Size (separate) Pieces

Bag of Glowing Embers (rockwool)

Figure 51

Step 3. Separate the Glowing Ember (Rockwool) into pieces about the size of a quarter (Figure

51). Keep the pieces uffed up, not matted.

Distribute these pieces over the front surface of the burner, as shown in Figure 52. Do not use more than is necessary. When properly positioned, the Glowing Embers will cover approximately 65% of the front burner and with no appreciable gaps or openings. Ensure that the main burner ports remain uncovered by the ember material.

Step 4. Placement of Logs - All top logs that rest on lower logs, do so over notches, indents or nubs. Proper log placement is critical to prevent sooting. Logs should be placed in the gaps between the ﬂame peaks and should be positioned so they do not impinge the ﬂames.

Step 5. Position the individual logs as shown in Figures 53, 54, and 55. Logs should be placed in the order shown. All logs that have notches to ﬁt over the grate tines should be positioned with these notches directly against the grate.

Handle logs carefully to prevent breakage.

Proper log placement is critical to encourage outstanding ﬂame appearance and prevent sooting. When positioned properly as shown, logs will be positioned between ﬂame peaks and will not impinge any ﬂames.

Refer to Figure 53 for MPD33 Series appliances, to Figure 54 for MPD35 Series appliances and to Figure 55 for MPD40 and MPD45 Series appliances.

REFERENCE

Firebox Accessories / Parts

Cat. No. Model No. Description

88L53 FGE Bag of Glowing Embers

80L42 FDVS

Bag of Decorative Volcanic Stone

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 28

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

MPD33 LOG PLACEMENT

Log Number Description (Stamped #)

Position the individual logs as shown below. Logs should be placed

in the order shown. Position the rear log on the brackets at the rear of the ﬁrebox with the log's notches directly over the brackets. Position the right log (log no. 3) by inserting the pin from the rear log into the hole on its upper end. Place the left log and then the smaller left and right top logs. All logs that have notches to ﬁt over the grate tines should be positioned with these notches directly against the grate. All top logs that rest on lower logs, do so over ﬂattened mounting faces in the bottom logs.

1 Log, Rear (39-12) 2 Log, Left (39-1) 3 Log, Right (39-2) 4 Log, Top Center (39-13) 5 Log, Top/Left (39-3) 6 Log, Top/Right (39-4)

Catalog Number for the entire log set: 24M15

Proper log and twig placement is critical to encourage outstanding ﬂame appearance and prevent sooting.

Figure 53

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 29

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

MPD35 LOG PLACEMENT

Log

Number Description (Stamped #)

1 Log, Rear (39-5) 2 Log, Left (39-1) 3 Log, Right (39-2) 4 Log, Top Center (39-6) 5 Log, Top/Left (39-3) 6 Log, Top/Right (39-4)

Catalog Number for the entire log set: H6197

Position the individual logs as shown below. Logs should be placed in the order shown. Position the rear log on the brackets at the rear of the ﬁrebox with the log's notches directly over the brackets. Position the right log (log no. 3) by inserting the pin from the rear log into the hole on its upper end. Place the left log and then the smaller left and right top logs. All logs that have notches to ﬁt over the grate tines should be positioned with these notches directly against the grate. All top logs that rest on lower logs, do so over ﬂattened mounting faces in the bottom logs.

Proper log and twig placement is critical to encourage outstanding ﬂame appearance and prevent sooting.

4 3

Figure 54

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 30

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

MPD40 AND MPD45 LOG PLACEMENT

Log

Number Description (Stamped #)

1 Log, Center (39-8) 2 Log, Rear (138) 3 Log, Right (39-10) 4 Log, Left (39-9) 5 Log, Top/Left (39-11) 6 Log, Top/Right (39-11)

Catalog Number for the entire log set: 24M25

Position the individual logs as shown below. Logs should be placed in the order shown. Position the center log on the burner ﬁrst, then place the glowing embers as shown in Figure 52. Place the rear log, both the right and left, and then the smaller left and right top logs. All logs that have notches to ﬁt over the grate tines should be positioned with these notches directly against the grate. All top logs that rest on lower logs, do so over ﬂattened mounting faces in the bottom logs.

Proper log and twig placement is critical to encourage outstanding ﬂame appearance and prevent sooting.

Figure 55

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 31

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

Step 10. REMOVING AND INSTALLING THE GLASS DOOR

WARNING

• Do not attempt to substitute the

materials used on these doors, 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.

Only doors certiﬁed with the appliance shall be used.

Removing the Glass Enclosure Panel (see Figure 56)

Remove the top louver assembly or radiant panel. To access the glass door securing latches, ﬁrst open the lower control compartment door (Figure 56 ) by pushing in simultaneously the left and right top corners of the door (the door is hinged at the bottom).

Remove the bottom compartment door by sliding the hinge pin, located at the door’s left side, to the right until it disengages from the left corner post hole. Pull the door diagonally to the left, away from the ﬁreplace.

Locate the two (2) latches at the top of the control compartment and disengage them from the door frame bottom vee-ﬂange, pulling down on their handles to open them.

Installing the Glass Enclosure Panel (see Figure 56)

Retrieve the glass door. Visually inspect the gasket on the backside of the frame. Gasket surface must be clean, free of irregularities and seated ﬁrmly.

Position the door in front of the ﬁrebox opening with the bottom of the door held away from the ﬁreplace (Figure 56). Hook the top ﬂange of the door frame over the top of the ﬁrebox frame.

Let the bottom of the door frame swing gently in towards the ﬁreplace ensuring that the gasket seats evenly as the door frame draws shut. Fasten the two latches located underneath the ﬁrebox ﬂoor to the door's vee-ﬂange. Close both the latches securely.

Lower Compartment Door and Hinge

Glass Door

Glass Door Frame Top Flange

Step 11. BURNER ADJUSTMENTS

Flame Appearance and Sooting

Proper ﬂame appearance is a ﬂame that is blue at the base and becomes yellowish-orange in the body of the ﬂame.

When the appliance is ﬁrst lit, the entire ﬂame may be blue and will gradually turn yellowishorange during the ﬁrst 15 minutes of operation. If the ﬂame remains 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 ﬂames. 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 ﬂames and lack of combustion air entering the air shutter opening. To achieve a warm yellowish-orange ﬂame with an orange body that does not soot, the shutter opening must be adjusted between these two extremes.

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 ﬂames that appear blue and transparent. These weak, blue and transparent ﬂames are termed anemic.

• Propane models may exhibit ames which

candle or appear stringy. If this is present and persists, adjust the air shutter to a more closed position, then operate the appliance for a few more minutes to ensure that the ﬂame normalizes and the ﬂames do not appear sooty.

The following chart is provided to aid you in achieving the correct air shutter adjustment for your installation.

Seules des portes certiﬁées pour cet appareil doivent être utilisées.

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

Glass Door Frame Bottom Vee-flange

Glass Door Latch

Figure 56

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Firebox Floor

Air Shutter Adjustment Guidelines

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

Page 32

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

WARNING

• Air shutter adjustment should

only be performed by a qualiﬁed professional service technician.

• Ensure front glass panel are

in place and sealed during adjustment.

CAUTION

• Soot will be produced if the

air shutter is closed too much. Any damage due to sooting, resulting from improperly setting the air shutter, is not covered under the warranty.

• The air shutter door and

nearby appliance surfaces are hot. Exercise caution to avoid injury while adjusting ﬂame appearance.

1. Refer to Figures 57, 58, and 59 for proper

ﬂame app earance. To adjust the ﬂame, rotate the adjustment rod toward the back or toward the front of the ﬁreplace (rod located in the lower control area). Position the air shutter to the factory setting as shown in the table in Figure 60.

2. Light appliance (follow lighting procedure

on lighting label in control compartment or in the Care and Operation Instructions).

3. Allow the burner to operate for at least 15

minutes while observing the ﬂame continuously to ensure that the proper ﬂame appearance has been achieved. If the following conditions are present, adjust accordingly.

• If ame appears weak or sooty, adjust

the air shutter, incrementally, to a more open position until the proper ﬂame appearance is achieved.

• If ame remains blue, adjust the air

shutter, incrementally, to a more closed position until the proper ﬂame appearance is achieved.

4. When satisﬁed that the burner ﬂame appear-

ance is normal, reinstall the lower control compartment door, then proceed to ﬁnish the installation.

Figure 57 - MPD33 MODEL

Figure 58 - MPD35 MODEL

Figure 59 - MPD40 AND MPD45 MODEL

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 33

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

Burner Tube

Air Shutter

Adjustment Rod Down

(fully open position)

Models

MPD33

MPD35

MPD40

MPD45

Figure 60

Adjusting Set Screw

Adjustment Rod Up

(minimum air opening position)

Gas

Type

Factory Air

Shutter Setting

inches (mm)

Nat. 1/32 (0.8)

Prop. 3/16 (4.76)

Nat. 1/32 (0.8)

Prop. 3/16 (4.76)

Nat. 1/8 (3.2)

Prop. 1/2 (13)

Nat. 1/8 (3.2)

Prop. 1/2 (13)

Step 12. HOOD INSTALLATION

Refer to Figures 61 and 62. All models must have hoods installed prior to operating.

On all Radiant Panel units, slide the hood into the slots on the lower edge of the radiant panel (Figure 61).

On louvered face units, slide the hood into the slots on the lower edge of the cabinet top (Figure 62).

FINISHING REQUIREMENTS Wall Details

Complete ﬁnished interior wall. To install the appliance facing ﬂush with the ﬁnished wall, position framework to accommodate the thickness of the ﬁnished wall (Figures 61 and 62)

See Page 5 for

Cold Climate Insulation and

Page 8 for Clearances.

Combustible

Finished Wall

Materials

Combustible material may touch top of appliance.

Combustible materials NOT allowed below this point on face of appliance.

Hood must be installed as shown.

This area must remain clear of combustible materials.

Header Spacing Top Standoff

Top of Appliance

Radiant panel

Top of Door Frame

Figure 61 - Radiant Panel Models

Combustible

Finished Wall

Materials

Combustible material may touch top of appliance.

Combustible materials NOT allowed below this point on face of appliance.

This area must remain clear of combustible materials.

Header Spacing Top Standoff

Top of Appliance

Louvers

Top of Door Frame

Min. 1 in. (25 mm)

Hood must be installed as shown.

Figure 62 - Louver Face Models

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 34

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

STEP 13. 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 safety instruction labels furnished with the ﬁreplace be afﬁxed to the operation and control point of the ﬁreplace. A safety instruction label must be afﬁxed to the wall switch plate where the ﬁreplace is turned on and off (See Figure A) or wall thermostat (See Figure B) and if used on the remote control handheld transmitter (Figure C). To properly complete the installation of this ﬁreplace, locate the multi-lingual adhesive labels provided with the Care and Operation Instructions and proceed as follows:

1. Locate the wall switch or wall thermostat that controls the ﬁreplace (verify the switch operates the ﬁreplace by turning it on and off). Clean the wall switch plate or wall thermostat thoroughly to remove any dust and oils. Afﬁx the label to the surface of the plate of the wall switch that controls the ﬁreplace (Figure A) or the wall thermostat (Figure B). Choose the language primarily spoken in the home. If unknown, afﬁx the English language label.

2. If a remote control is used to control the ﬁreplace, locate the transmitter and clean it thoroughly to remove any dust and oils. Afﬁx the label to the surface of handheld transmitter (Figure C). Choose the language primarily spoken in the home. If unknown, afﬁx 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.

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

Il est impératif que les étiquettes de sécurité fournies avec le foyer soient collées à côté des dispositifs de contrôle du foyer. Une étiquette de sécurité doit être collée sur la plaque de l’interrupteur contrôlant l’allumage du foyer (voir Figure A) ou sur le thermostat mural (voir Figure B) et, le cas échéant, sur le boîtier de la télécommande (Figure C). Pour achever l’instal lation 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 l’interrupteur ou le thermostat mural qui contrôle le foyer (vériﬁez que l’interrupteur contrôle le fonctionnement du foyer en le faisant basculer de Marche à Arrêt, et vice-versa). Nettoyez soigneusement la plaque murale de l’interrupteur ou le thermostat mural pour éliminer la poussière et les traces de graisse ou d’huile. Collez l’étiquette sur la surface de la plaque de l’interrupteur mural qui contrôle le foyer (Figure A) ou du thermostat mural (Figure B). Choisissez la langue qui est principalement parlée dans la résidence du propriétaire. En cas de doute, collez l’étiquette en anglais.

2. Si une télécommande est utilisée pour contrôler le foyer, nettoyez la soigneusement pour éliminer la poussière et les traces de graisse ou d’huile. Collez l’étiquette sur le boîtier de la télé commande (Figure C). Choisissez la langue qui est principalement parlée dans la résidence du proprié taire. 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.

COLOCACIÓN DE ADVERTENCIAS DE SEGURIDAD EN OPERACIÓN

Se requiere que las etiquetas de instrucciones de seguridad incluidas con la chimenea se coloquen en el punto de operación y control de la misma. Se debe colocar una etiqueta de instrucciones de seguridad en la placa del interruptor de pared desde el cual se enciende y se apaga la chimenea (ver la Figura A) o en el termostato de pared (ver la Figura B) y en el transmisor de control remoto (Figura C) si se usa. 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. Identiﬁque el interruptor o el termostato de pared que controla la chimenea (veriﬁque que el interruptor opera la chimenea encendiéndola y apagándola). Limpie bien la placa del interruptor o el termostato de pared para quitar el polvo y aceite. Pegue la etiqueta en la superﬁcie de la placa del interruptor que controla la chimenea (Figura A) o en el termostato de pared (Figura B). Seleccione el idioma que más se habla en la casa. Si no sabe cuál es, use la etiqueta en inglés.

2. Si se usa un control remoto para controlar la chimenea, encuentre el transmisor y límpielo bien para quitar el polvo y aceite. Pegue la etiqueta en la superﬁcie del transmisor (Figura C). 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.

SAFETY LABEL DIAGRAMS DIAGRAMAS DE ETIQUETAS DE

Illustrations are for example only. Your accessories may be different.

Les illustrations sont par exemple

uniquement. Vos accessoires peuvent être différents.

Las ilustraciones son sólo ejemplos. Tu accesorios pueden ser diferentes.

Figure A

DIAGRAMMES DES ÉTIQUETTES

DE SÉCURITÉ

Figure B

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

SEGURIDAD

Figure C

Page 35

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

n t

INSTALLATION ACCESSORIES

Listed Secure Vent® Components

Cat. No. Model Description

H1968 SV4.5HT-2 Horizontal Square Ter-

mination with Firestop/ Spacer (H2246) and Adaptor (74L61)

H2152 SV4.5CGV-1 Vertical Termination Cap,

High Wind

94L10* SV4.5HTSS Horizontal Small Square

Termination with

Firestop/Spacer (96K80)

and Adaptor (74L61)

98L27* SV4.5HTSSL Horizontal Small Square

- Long Termination with

Firestop/Spacer (96K80)

and Adaptor (74L61)

17M52 SV4.5HGS-1 Termination Guard,

Square (1 pack)

Instr. #750109M)

17M53 SV4.5HGS-12 Termination Guard, Hori-

zontal Square (12 pack)

(Ref. Instr. #750109M)

87L02 SV4.5HGS Termination Guard for

Horizontal Square Termination (Deluxe) (1 pack)

(Ref. Instr. #750055M)

(Ref.

Vent Sections

(Rigid)

Listed Secure Vent® Components

Cat. No. Model Description

77L70 SV4.5L6 6 Inch (152 mm) 77L71 SV4.5L12 12 Inch (305 mm) 77L72 SV4.5L24 24 Inch (610 mm) 77L73 SV4.5L36 36 Inch (914 mm) 77L74 SV4.5L48 48 Inch (1219 mm) 77L75 SV4.5LA Telescopic Length Slip

Section (2" to 7-1/2" rigid)

77L76 SV4.5E45 45 Degree Elbow

77L77 SV4.5E90 90 Degree Elbow

10K81 SFMP Mill-Pac, Black, High-

Temperature Sealant

89L40 SFMP-12 Mill-Pac, Black, High-

Temperature Sealant, Bulk 12 pack

99L02 SV4.5HRK14 Horizontal Riser Kit, 14",

(Ref. Instr. #750146M)

99L03 SV4.5HRK36 Horizontal Riser Kit, 36",

(Ref. Instr. #750146M)

96K93 SV4.5SU Support Strap

H5820 SV4.5HTSK Termination Shroud

(Guard) for Horizontal Square Termination (1 pack)

(Ref. Instr.

#750246M)

H3907 SV4.5ARSA Attic Insulation Shield with

adjustable height, 12"-22"

H1988 CTSA-33 Chase Top Shroud Kit,

Arch Top 3 X 3 Ft.,

Instr. #750194M)

(Ref.

H1985 CTSO-33 Chase Top Shroud Kit,

Open Top 3 X 3 Ft., (Ref.

Instr. #750193M)

H1987 CTSO-44 Chase Top Shroud Kit,

Open Top 4 X 4 Ft., (Ref.

Instr. #750193M)

H1986 CTSO-46 Chase Top Shroud Kit,

Open Top 4 X 6 Ft., (Ref.

Instr. #750193M)

H5816 SV4.5-

TWSK10

Through Wall Shield Kit

(used to shield the direct-vent pipe from blown insulation)

(Ref. Instr. #750247M)

The following ﬂashings come packaged with a storm collar:

77L78 SV4.5F Flat Roof Flashing

77L79 SV4.5FA 1/12 to 7/12 Adjustable

Flashing

77L80 SV4.5FB 7/12 to 12/12 Adjustable

Flashing

77L81 SV4.5SC6 Storm Collar (6 per box)

H6183 SV4.5HF5 Firestop Spacer, 5", rigid H6184 SF4.5HF5 Firestop Spacer, 5", ex H2246 SV4.5HF-10 Firestop / Spacer - Hori-

zontal, rigid (3-1-1 spacing), 10 Pack

H2247 SV4.5VF-10 Firestop/Spacer - Verti-

cal, rigid (1-1-1 spacing), 10 Pack

96K92 SV4.5SP Support Plate

*Only for use with MPDT33 and MPD35 models.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 36

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

INSTALLATION ACCESSORIES CONTINUED

Listed Secure Flex® Components

Cat. # Model Description

These termination kits include ﬁrestop/spacer, gear clamps and ﬂex adaptor.

60L10 SF-18 18 feet (5.49 m) *

98K03 SF-12 12 feet (3.66 m)*

H2248 SF4.5HF-10 Firestop / Spacer -

H2249 SF4.5VF-10 Firestop/Spacer - Vertical,

56L74 SFVT30 Vertical Termination for ex

56L75 SFVT45 Vertical Termination for ex

91L66 SFGC4-6 Gear Clamp 4.5" (114 mm)

91L67 SFGC7-6 Gear Clamp 7.5" (190.5 mm)

H7748 H7748 36" Flex Connector Kit. 36"

compressed ex

(Ref. Instr. #750053M)

compressed ex (Ref. Instr.

#750052M)

Horizontal, ex (3-1-1 spacing), 10 Pack

ex (1-1-1 spacing), 10 Pk

(ﬂat to 6/12) with ﬂex adaptor,

section of rigid vent, roof support collar assembly, roof ﬂashing and storm collar.

(Ref. Instr. #750052M)

(6/12 to 12/12) with ﬂex adaptor, section of rigid vent, roof support collar assembly, roof ﬂashing, and storm collar.

#750052M)

(Ref. Instr.

for ex (6 pack)

of ﬂex with two adaptors for mating two rigid sections of vent together.

Listed Secure Flex® Components

Cat. # Model Description

H1969 SF4.5HT-2 Horizontal Square Termina-

77L87 SFKIT12S Square Term. for ex (with

77L88 SFKIT18S Square Term. for ex (with

77L89 SFKIT24S Square Term. for ex (with

77L90 SFKIT36S Square Term. for ex (with

77L91 SFKIT48S Square Term. for ex (with

94L04* SFKIT12SS Small Square Termination for

94L05* SFKIT18SS Small Square Termination for

94L06* SFKIT24SS Small Square Termination for

94L07* SFKIT36SS Small Square Termination for

94L08* SFKIT48SS Small Square Termination for

94L09* SF-HTSS Horizontal Small Square

tion for ex (without ﬂex vent)

12" [305 mm] compressed ﬂex vent**)

18" [457 mm] compressed ﬂex vent**)

24" [610 mm] compressed ﬂex vent**)

36" [914 mm] compressed ﬂex vent**)

48" [1219 mm] compressed ﬂex vent**)

ex, with 12" (305 mm) of compressed ﬂex vent**

(Ref. Instr. #750204M)

ex, with 18" (457 mm) of compressed ﬂex vent**

(Ref. Instr. #750204M)

ex, with 24" (610 mm) of compressed ﬂex vent**

(Ref. Instr. #750204M)

ex, with 36" (914 mm) of compressed ﬂex vent**

(Ref. Instr. #750204M)

ex, with 48" (1219 mm) of compressed ﬂex vent** (Ref.

Instr. #750204M)

Termination for ex, without ﬂex vent (Ref. Instr. #750204M)

*Only for use with MPDT33 and MPD35 models. **All compressed ﬂex vents can be expanded up to two times.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 37

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

GAS CONVERSION KITS

WARNING

This conversion kit shall be installed by a qualiﬁed service agency in accordance with the manufacturer’s instructions and all applicable codes and requirements of the authority having jurisdiction. If the information in these instruction is not followed exactly, a ﬁre, explosion or production of carbon monoxide may result causing property damage, personal injury or loss of life. The qualiﬁed service agency is responsible for the proper installation of this kit. The installation is not proper and complete until the operation of the converted appliance is checked as speciﬁed in the manufacturer’s instructions supplied with the kit.The qualiﬁed service agency performing this installation assumes responsibility for this conversion.

AVERTISSEMENT

Cette trousse de conversion doit être installée par un technicien agréé, selon les instructions du fabricant et selon toutes les exigences et tous les codes pertinents de l’autorité compétente. Assurez-vous de bien suivre les instructions dans cette notice pour réduire au minimum le risque d’incendie, d’explosion ou la production de monoxyde de carbone pouvant causer des dommages matériels, des blessures ou la mort. Le tecnicien agréé est responsable de l’installation de cette trousse. L’installation n’est pas adéquate ni complète tant que le bon fonctionnement de l’appareil converti n’a pas été vériﬁé selon les instructions du fabricant fournies avec la trousse. Le fournisseur de service qualiﬁé ayant réalisé l'installation assume les responsabilités liées à la conversion.

In Canada: THE CONVERSION SHALL BE CARRIED OUT IN ACCORDANCE WITH THE REQUIREMENTS OF THE PROVINCIAL AUTHORITIES HAVING JURISDICTION AND IN ACCORDANCE WITH THE REQUIREMENTS OF THE CAN/CGA-B149.1 INSTALLATION CODE.

LA CONVERSION DEVRA ÊTRE EFFECTUÉE CONFORMÉMENT AUX RECOMMANDATIONS DES AUTORITÉS PROVINCIALES AYANT JURIDICTION ET CONFORMÉMENT AUX EXIGENCES DU CODE D'INSTALLATION CAN/CGA-B149.1.

Gas conversion kits are available to adapt your appliance from the use of one type of gas to the use of another. These kits contain all the necessary components needed to complete the task including labeling that must be afﬁxed to ensure safe operation.

Kit part numbers are listed here and the following steps detail the conversion procedure. Refer to the instructions provided with the conversion kit when performing any gas conversion.

Millivolt SIT Systems

Natural Gas To Propane Gas

Conversion Kits Models Catalog No. MPD33 H2009 MPD35 H2011 MPD40 H2013 MPD45 H2015

Millivolt SIT Systems

Propane Gas to Natural Gas

Conversion Kits Models Catalog No. MPD33 H2010 MPD35 H2012 MPD40 H2014 MPD45 H2016

Electronic SIT Systems

Natural Gas To Propane Gas

Conversion Kits

Models Catalog No.

MPD33 H8632 MPD35 H8634 MPD40 H8636 MPD45 H8638

Electronic SIT Systems

Propane Gas To Natural Gas

Conversion Kits Models Catalog No. MPD33 H8631 MPD35 H8633 MPD40 H8635 MPD45 H8637

INSTALLATION INSTRUCTIONS

Step 1. TURN OFF THE GAS SUPPLY TO THE APPLIANCE and disconnect power supply at the circuit breaker. Ensure appliance is cold.

CAUTION: THE GAS SUPPLY SHALL BE SHUT OFF PRIOR TO DISCONNECTING THE ELECTRICAL POWER, BEFORE PROCEEDING WITH THE CONVERSION.

ATTENTION: AVANT D’EFFECTUER LA CONVERSION, COUPEZ D’ABORD L’ALIMENTATION EN GAZ, ENSUITE, COUPEZ L’ALIMENTATION ÉLECTRIQUE.

Step 2. Open the lower control compartment

door (see Figure 48 on Page 27) by pushing on the right top corner of the door (the door is hinged at the bottom).

[Optional] Remove the control compartment door by sliding the hinge pin, located at the door’s left side, to the right until it disengages from the left corner post hole. Pull the control compartment door diagonally to the left, away from the ﬁreplace.

Step 3. Remove the front glass door/frame from the appliance (see Page 32).

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 38

LENNOX HEARTH PRODUCTS • MERIT PLUS® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS

Pressure Regulator

Remove These Components

Pilot

Orifice

Step 4. Carefully remove the logs. Exercise care so as not to break the logs.

Step 5. Refer to Figure 53, 54, or 55. A. Remove the grate and sub ﬂoor. B. Remove the two (2) screws securing the

burner assembly. C. Remove the burner assembly with attached

venturi tube.

Millivolt and Electronic Ignition System Appliances

Step 6. SIT Systems - Refer to Figure 63

and the instructions provided with the SIT

Regulator Conversion Kit. Using a Torx T20

driver (with 1/4" shank and center hole) or slotted screwdriver, remove and discard the pressure regulator mounting screws (two screws for electronic models, three screws for millivolt models), pressure regulator tower, the diaphragm assembly (if applicable) and the spring. Discard all removed components.

Step 7. Install the new pressure regulator assembly using the supplied screws as shown in Figure 63. Tighten the screws to 25 in-lb.

Millivolt Valve

Electronic Valve

Figure 63: Regulator Conversion

Step 8. Install the enclosed identiﬁcation label to the valve body where it can be easily seen.

Step 9. Refer to Figure 64. Remove the pilot hood assembly to access the hexed pilot oriﬁce. Remove and replace the oriﬁce with the one provided with the kit. Exercise extreme care to prevent damage to or breakage of the igniter assembly.

Figure 64: Millivolt Pilot (electronic pilot is similar)

Step 10. Remove the oriﬁce from the manifold and replace it with the one provided in the kit. See Table 10 for oriﬁce sizes for natural and propane models. Figure 65 illustrates the oriﬁce.

Burner Oriﬁce Sizes

Elevation 0-4500 feet ( 0-1372 meters)

Model

Series

MPD33

MPD35

MPD40

MPD45

Table 10

Nat.Gas

drill size (inches)

#47 (0.0785")*

99K74 •

#44 (0.086")*

60J80 •

#38 (0.102") *

99K76 •

#37 (0.104")*

24M10 •

* Standard size installed at factory

• Part /Cat. Number

Propane

drill size (inches)

0.048"

99K78 •

#55 (0.052")*

19L52 •

0.062"

21L01 •

#52 (0.0635")*

37G00 •

Figure 65: Orice

Use pipe joint compound or Teﬂon tape on all pipe ﬁttings before installing (ensure propane resistant compounds are used in propane applications, do not use pipe joint compounds on ﬂare ﬁttings).

Step 11. Retrieve the burner and hold the

venturi tube above the oriﬁce. Place the shutter adjusting rod in the slot of the shutter arm (see Figure 60 on Page 34). Set the burner assem- bly into its position and secure the trapezoidal plate with the two screws previously removed.

Step 12. Reinstall the bafﬂe with the two bafﬂe securing screws.

Step 13. Reassemble the remaining components by reversing the procedures outlined in the Steps 1-5.

Step 14. Attach the conversion label provided in the conversion kit next to the rating plate on the appliance.

Step 15. Turn on gas supply and test for gas leaks (refer to Page 27).

Step 16. Relight the main burner. The lighting instructions can be found on the lighting label in the control compartment or in the Care and Operation Manual provided with the appliance. Verify proper burner ignition and operation. See Burner Adjustments and Burner Flame Appearance on Page 33.

Step 17. Inspect the pilot system for proper ﬂame. The pilot ﬂame should engulf the ﬂame sensor as shown in Figures 49 and 50 on Page 27.

Step 18. Using a manometer, test the inlet and manifold gas pressures. See Tables 2 and 3 on Page 4.

ALWAYS TEST PRESSURES WITH THE VALVE REGULATOR CONTROL AT THE HIGHEST SETTING.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Lennox Hearth Products reserves the right to make changes at any time, without notice, in design, materials, speciﬁcations, and prices, and also to discontinue colors, styles, and products. Consult your local distributor for ﬁreplace 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.

P/N 506015-07 Rev. B 06/2013

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

Lennox MPDT33RPM, MPD35CNM, MPDR33RNM, MPDR33RPM, MPD35RNM Installation Instructions Manual

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