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

...

INSTALLATION INSTRUCTIONS

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

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

WARNING /AVERTISSEMENT/AVISO

HOT GLASS WILL

CAUSE BURNS.

DO NOT TOUCH GLASS

UNTIL COOLED.

NEVER ALLOW CHILDREN

TO TOUCH GLASS.

UNE SURFACE VITRÉE CHAUDE

PEUT CAUSER DES BRÛLURES.

LAISSER REFROIDIR LA SURFACE

VITRÉE AVANT D'Y TOUCHER.

NE PERMETTEZ JAMAIS À UN ENFANT

DE TOUCHER LA SURFACE VITRÉE.

EL VIDRIO CALIENTE

CAUSARÁ QUEMADURAS.

USTED DEBE NUNCA

TOCAR EL VIDRIO CALIENTE.

LOS NIÑOS DEBEN NUNCA

TOCAR EL VIDRIO.

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

- WHAT TO DO IF YOU SMELL GAS:

• Do not try to light any appliance.

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

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

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

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

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

- QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ :

• Ne pas tenter d’allumer d’appareil.

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

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

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

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

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

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.

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

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)

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.

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.

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.

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)

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.

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

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.

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.

+ 26 hidden pages

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

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User Manual