Lennox MPD-3530CPM-B, MPDR-3328CPE-B, MPDR-3328CPM-B, MPD-3530CNE-B, MPDR-3328CNE-B User 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

P/N 850014 Rev. V 08/2011

This manual is one of a set of two supporting this product. Refer to P/N 875014M for Care and Operation Instructions.

Ce manuel est disponible en francais, simplement en faire la demande. Numéro de la pièce 850014CF.

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.

MODELS

MPDT-3328CNM-B MPDT-3328CPM-B MPDR-3328CNM-B MPDR-3328CPM-B MPD-3530CNM-B MPD-3530CPM-B

OTL Report No. 116-F-13-4

Please read and understand these instructions

MILLIVOLT:

MPD-4035CNM-B MPD-4035CPM-B MPD-4540CNM-B MPD-4540CPM-B

Portland

MPDT-3328CNE-B MPDT-3328CPE-B MPDR-3328CNE-B MPDR-3328CPE-B MPD-3530CNE-B MPD-3530CPE-B

before starting installation.

ELECTRONIC:

MPD-4035CNE-B MPD-4035CPE-B MPD-4540CNE-B MPD-4540CPE-B

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

New York City Approval ................................ 4

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

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

Location 5

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

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

Pre-Installation Steps ................................. 10

Typical Installation Sequence .................... 10

Detailed Installation Steps .......................... 10

Step 1. Framing .......................................... 10

Fireplace and Framing Speciﬁcations ....... 11

Step 2. Routing Gas Line ........................... 12

Step 3. Preparing Appliance Vent Collar ..... 13

Step 4. Installing Vent System ................... 13

Vertical Termination Systems .................. 14

Vent Section Length Chart ...................... 14

Vertical Vent Tables and Figures .............. 17

Horizontal Termination System ............... 19

Horizontal Vent Tables and Figures ......... 21

Venting Using Flexible Vent Pipe ............. 24

Step 5. Field Wiring ................................... 25

Step 6. Optional Blower Kit Wiring ............ 26

Step 7. Connecting Gas Line ..................... 26

Step 8. Verifying Appliance Operation ........... 27

Step 9. Installing Logs ............................. 28

Step 10. Remove/Install Glass Door .......... 32

Step 11. Burner Adjustments ..................... 32

Step 12. Hood Installation .......................... 34

Finishing Requirements ............................. 34

Step 13. Attaching Safety-in-Operation

Warnings ................................................ 35

Installation Accessories ............................. 36

Gas Conversion Kits .................................. 38

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 compart-

ment).

• Literature Kit (envelope in bottom com-

partment containing Care and Operation Instructions, Installation Instructions, Safety- In-Operation Warning Labels, Warranty).

• (1) Vent Restrictor (attached to Literature Kit

envelope).

• (1) Hood (inside ﬁrebox).

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.

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™ Direct-Vent System Compo-

nents manufactured by Security Chimneys International,

• Secure Flex™ Flexible Vent Components

manufactured by Security Chimneys International and

• Z-FLEX™ Model GA Venting Systems listed

to UL1777 and ULCS635 manufactured by Flexmaster Canada Limited.

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.

GENERAL INFORMATION

WARNING

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

AVERTISSEMENT

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

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

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

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

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.

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

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

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

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

IMPROPER INSTALLATION OR USE OF THIS APPLIANCE CAN CAUSE SERIOUS INJURY OR DEATH FROM FIRE, BURNS, EXPLOSION OR CARBON MONOXIDE POISONING.

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

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

These appliances comply with National Safety Standards and are tested and listed by OMNI-Test Laboratories, Inc. (Report No. 116-F-13-4) to ANSI Z21.88 (in Canada, CSA-

2.33), and CAN/CGA-2.17-M91 in both USA and Canada, as vented gas ﬁreplace heaters.

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

Misc. Codes / Standards

The Installation must conform to local codes or, in the absence of local codes, with the National

Fuel Gas Code, ANSI Z223.1/NFPA 54 - latest edition (In Canada, the current CAN/CSA-B149.1

installation code).

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

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

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

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

Millivolt models come standard with a manually modulated gas valve; ﬂame appearance and heat output can be controlled at the gas valve. The BTU Input for these appliances is shown in Table 1.

Electronic Models - Electronic models have a ﬁxed rate gas valve. Input of electronic models is shown in Table 1.

Input (BTU/HR) Gas Valves (all models)

Models

MPDT/R-3328

(Millivolt)

MPD-3530

(Millivolt)

MPD-4035

(Millivolt)

MPD-4540

(Millivolt)

MPDT/R-3328

(Electronic)

MPD3530

(Electronic)

MPD4035

(Electronic)

MPD4540

(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 17,500

20,000 20,000

27,000 27,000

29,000 29,000

17,500 high

14,000 low

20,000 high

15,200 low

27,000 high

21,500 low

29,000 high

22,500 low

Table 1

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:

Inlet Gas Supply Pressure

(all models)

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

Manifold Gas Supply Pressure

(all models)

Fuel # Low High

Natural

Gas

Propane

(Lo) 1.6" WC

(0.40 kPa)

(Lo) 6.3" WC

(1.57 kPa)

(Hi) 3.5" WC

(0.87 kPa)

(Hi) 10.0" WC

(2.49 kPa)

Table 3

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

These appliances must be isolated from the gas supply piping system (by closing their individual manual shut-off valve) during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.5 kPa).

These appliances and their individual shut-off valves must be disconnected from the gas supply piping system during any pressure testing of that system at pressures greater than 1/2 psig (3.5 kPa).

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

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

These appliances are tested and approved for installation at elevations of 0-4500 feet (0-1372 meters) above sea level using the standard burner oriﬁce sizes (marked with an "*" in Table 4 ).

For elevations above 4500 feet, contact your gas supplier or qualiﬁed service technician.

Deration - At higher elevations, the amount of BTU fuel value delivered must be reduced by either using gas that has been derated by the gas company or by changing the burner oriﬁce to a smaller size as regulated by the local authorities having jurisdiction and by the (USA) National Fuel Gas Code NFPA 54/ANSI Z223.1 - latest edition or, in Canada, the CAN/ CSA-B149.1 codes - latest edition.

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

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

Burner Oriﬁce Sizes

Elevation 0-4500 feet ( 0-1372 meters)

Model

Series

MPDT-3328 MPDR-3328

MPD-3530

MPD-4035

MPD-4540

Table 4

Nat.Gas

drill size (inches)

#45 (0.0820")*

39L66•

#44 (0.0860")*

60J80•

#37 (0.1040")*

24M10•

#36 (0.1065")*

18L40•

* Standard size installed at factory

• Part /Cat. Number

Propane

drill size (inches)

0.048 inch 99K78•

#55 (0.0520")*

19L52•

0.063 inch 21L01•

#52 (0.0635")*

37G00•

Gas Valve Diagrams

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

Main Gas Control Knob

OFF/PILOT/ON

OUT

Manifold Pressure Tap

Inlet Pressure Tap

Pilot Adjustment

HI/LO Variable Flame Height Adjustment

Screw

HTPTHTPT

Figure 1: SIT Millivolt Gas Valve

Electronic

Gas Control

Valve

P SI

Inlet

Pressure

Port

ON/OFF Switch Manifold Pressure Port

R E

IGN

OFF

CONTROL

Figure 2: Honeywell Electronic Gas Valve

REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS

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

• Install this appliance in accordance with Massachusetts Rules and Regulations 248 C.M.R.

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

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

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

Massachusetts Horizontal Vent Requirements

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

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

• A metal or plastic identiﬁcation plate must be permanently mounted to the exterior of the building at a minimum height of eight (8) feet above grade and be directly in line with the horizontal termination. The sign must read, in print size no less than one-half (1/2) inch in size, GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.

NEW YORK CITY, NEW YORK (MEA)

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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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 and the Manufactured Home Construction and Safety Standard, Title 24 CFR, Part 3280, in the United States, or the Standard for Installation in Mobile Homes, CAN/ CSA Z240 MH Series, in Canada.

Cet appareil peut être installé cómme du matéri-el d'origine dans une maison préfabriquée (É.U. seulement) ou mobile et doit être installé selon les instructions du fabricant et conformément à la norme Manufactured Home Constructions and Safety, Title 24 CFR, Part 3200 aux Unis ou à la norme Can/CSA-Z240 Série MM, Maisons mobiles au Canada.

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

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

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

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

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

REAR VENT

APPLICATION

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)

APPLICATION

TOP VENT

APPLICATION

HORIZONTAL VENT (Top Vent Application)

Figure 3: Typical Locations

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 locat-ing television sets and decorative plants.

VERTICAL VENT (Top Vent Application)

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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

LOWEST DISCHARGE OPENING OF VENT

TERMINATION HEIGHTS FOR VENTS ABOVE

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/CSA-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

Vertical Vent Termination Clearances

Horizontal Overhang

2 FT MIN.

Termination

Storm Collar

Flashing

Concentric

Vent Pipe

FLAT OR SLOPED ROOFS

Vent

*H = MINIMUM HEIGHT FROM ROOF TO

2 FT MIN.

Lowest

Discharge

Opening

1 inch (25.4 mm) Minimum Clearance to Combustibles

Vertical Wall

Roof Pitch is X/12

Figure 5

Horizontal Vent Termination Clearances

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

Termination Heights For Vents

bove Flat Or Sloped Roofs ef. NFPA 54 / ANSI Z223.1

oof Pitch *H (ft) *H (m)

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

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

Figure 4 - Multiple Terminations

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

inches or less in length

2-1/2

Combustible Projection greater

than 2-1/2 inches in length

Ventilated

Soffit

Unventilated

Soffit

18"

(457 mm)

12"

(305 mm)

(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

Side Elevation View

Termination Kit

Note - See Figure 37 on Page 20 for the exterior wall recess

Figure 6

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

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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.

Figure 7

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

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).

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.

MINIMUM CLEARANCES* Inches (millimeters)

Back 1/2 in. (13)

0 (0) from Spacers Or Dimples

Sides 1/2 in. (13)

0 (0) from Spacers Or Dimples **

Top Spacers 0 (0)

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 in. (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.

Models

MPDT-3328

MPDR-3328

MPD-3530 46-1/2 (1181) 48-1/4 (1226) 35-1/4 (895) 35-1/4 (895) MPD-4035

MPD-4540

Do not insulate the space between the

appliance and the

Shelf Above Fireplace With Rear Venting

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

Secure Vent Secure Flex Secure Vent Secure Flex

44-1/2 (1130) 46-1/4 (1175) 33-1/4 (845) 33-1/4 (845)

51-1/2 (1308) 53-1/4 (1353) 40-1/4 (1022) 40-1/4 (1022)

area above it.

Shelf Height

see table)

(

Combustible Shelf Height - Inches (millimeters)

Do not insulate the space between the

appliance and the

area above it.

Shelf Height

see table)

(

Shelf Above Fireplace With Top Venting

Figure 8:

Shelf Height Minimum Clearances

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)

17"

14"

Min. Distance To Unprotected Perpendicular Side Wall

8-1/4"

45°

Combustible Materials Allowed In Shaded Area “Safe Zone”

12"

Top View Of

Fireplace

Side Wall

Min. Distance To Protected Perpendicular Side Wall

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 65 and 66 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 non-combustible materials may be installed at any height above the appliance opening; however, do not allow anything to hang below the ﬁreplace hood.

Figure 9: Minimum Mantel Clearances

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

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

WARNING

AVERTISSEMENT

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

Figure 10: Minimum Distance to Side Wall

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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 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 Glass Panels on Page 32.

4. See Figure 11. Remove the top louvered panel and locate the pressure relief plates. Lift the pressure relief plates, and remove the cardboard from beneath each plate (taking care not to damage the white gasket).

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.

Pressure Relief Plates

REMOVE

OAR

CAR

EFORE USING

Remove cardboard before using appliance.

Take care not to damage white gasket.

Figure 11

REMOVE

CAR

EFORE USING

OAR

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 60, page

32). Bend up the outer pair for 1/2" materials

and the inner pair for 5/8" materials. Bend out the appropriate nailing ﬂanges for

the drywall/ﬁnish material to be used. Nailing ﬂanges are provided for ﬂush framing, 1/2-inch and 5/8-inch framing depths (see Figure 12).

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

Step 3. PREPARING APPLIANCE VENT COLLAR

(MPD-3530/4035/4540 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 operat-

ing 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 LOGS, VOLCANIC STONE, AND GLOWING EMBERS (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 13 and 14 on Pages 10 and 11 (Figure 14

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 12. Use 8d nails or their equivalent.

IMPORTANT!

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.

Lift up inner pair for 5/8" finish materials.

Unit Nailing Flange

(No clearance to combustible framing is required.)

Side

Framing

Unit Secured to Framing

by Nailing Flange

Left Side Front Corner of Fireplace Shown

(Right side requirements are the same)

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 12

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

.oNledoM A B C D E

8233-TDPM

.ni 4/133 4/133 ----- 4/373 8/721

mm 548 548 ----- 959 723

8233-RDPM

.ni 4/133 4/133 8/591 ----- 8/721

mm 548 548 894 ----- 723

0353-DPM

.ni 4/153 4/153 61/1112 4/393 61

mm 598 598 155 0101 604

5304-DPM

.ni 4/104 4/104 61/1162 4/344 61

mm 2201 2201 876 7311 604

0454-DPM

.ni 4/154 4/104 61/1162 4/344 61

mm 9411 2201 876 7311 604

FIREPLACE AND FRAMING SPECIFICATIONS

Framing

Notes

Diagrams, illustrations and photographs are not to scale. Consult installation instructions. Product designs, materials, dimensions, speciﬁcations, colors, and prices are subject to change or discontinuance without notice.

Vent Size

Coaxial DV Vent Size 4-1/2" Inner; 7-1/2" Outer

Efﬁciencies %

Fireplace

Model

MPDT-3328 62 45 64 49 MPDR-3328 61 53 64 55 MP

D-3530 MPD-4035 67 59 67 60 MP

D-4540

Natural Gas Propane

EnerGuide

AFUE

(P4)

62 53 60 55

67 59 67 59

AFUE

EnerGuide

(P4)

Viewable Glass Size

33" Model

35" Model

40" Model

45" Model

27-1/2" Wide

17" High

29-1/2" Wide 18-7/8" High

34-1/2" Wide

24" High

39-1/2" Wide

24" High

VENT FRAMING: TOP VENT WITH ONE 90° ELBOW

VENT FRAMING: REAR VENT WITH NO ELBOWS

10-1/2

(

)

267

5-1/8 (130)

5-1/8

(130)

(178)

Framing should be constructed of 2x4 or larger lumber.

1/2

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

Vertical Venting through the Ceiling

Frame ceiling opening: Use a plumb line from the ceiling

above the appliance to locate center of the vertical run. Cut and/or frame an opening, 10-1/2" x 10-1/2" (267 mm x 267 mm) inside dimensions, about this center mark (see Figure 18).

12-1/8

(308)

12-1/8

(308)

Inches (mm)

Top View

(Louvered Front Model Shown)

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 MPDT-3328 and MPDR-3328 models.

Concentric Flue: Flue

4-1/2" (114 mm); Combustion Air 7-1/2" (190 mm).

See Notes [1] and [2].

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

.ni 8/133 8/103 71 2/172 8/133 8/591 2/112 4/301 61/316 3 23/118 3/22 31

8233-TDPM

8233-RDPM

Figure 13

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

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

0353-DPM

mm 298 618 384 947 298 155 236 613 022 67 022 67 604

5304-DPM

.ni 8/104 8/173 42 2/143 8/104 61/1162 8/792 1 61/514 9 3 9 3 61 mm 9101 349 016 678 9101 876 957 973 022 67 022 67 604

0454-DPM

.ni 8/104 8/173 42 2/193 8/154 61/1162 8/743 61/771 9 3 9 3 61 mm 6411 349 016 3001 6411 876 688 344 022 67 022 67 604

Front View

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

3 (76)

in louvered front model.

Optional Electrical Inlet

Field-Provided Junction

NOTE: Eyebrow hood

shown as positioned

Gas Inlet (either

side and bottom)

Knockout requiring a

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

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

FIREPLACE FRAMING SPECIFICATIONS

.oNledoM A B C D E F

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

8233-TDPM 8233-RDPM

mm 148 2321 278 734 616 721

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

0353-DPM

mm 298 1641 2301 784 037 651

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

5304-DPM

mm 9101 4551 1011 784 977 002

.ni 8/154 8/366 61/5164 61/391 61/333 4/39

0454-DPM

mm 6411 6861 2911 784 348 842

Note:

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

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

• MPDT-3328 AND MPDR-3328 Models: Dimensions A through F occur when

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

• MPD-3530, MPD-4035, and MPD-4540 Models: Dimensions D through F

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

Figure 14: 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 15. Gas lines must be routed, constructed and made of materials that are in strict accordance with local codes and regulations. All appliances are factory-equipped with a ﬂexible gas line connector and 1/2-inch shutoff valve. (See Step 6 on Page 25).

Left Side Front

Corner of Fireplace

Framing

Pipe Coupling

(Recommended)

6-1/2"

(152 mm)

(76 mm)

Also see Figure 13.

Figure 15: Route Gas Line

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/CSA-B149.1

- latest edition (Canada).

MPD and MPDR units

MPD and MPDT units

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

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 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

Black Iron Pipe

Inside Diameter (Inches)

Schedule 40 Pipe

Length (feet)

Natural

Gas

Propane

Gas

0-10 1/2 3/8

10-40 1/2 1/2

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

Table 6

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

7" (178 mm)

Notes:

• All appliances are factory-equipped with a ﬂexible gas line connector and 1/2 inch shutoff valve (see Figure 50 on Pagec 25).

• See Massachusetts Requirements on Page 4 for additional requirements for installations in the state of Massachusetts in the USA.

• The gas supply line should Not be connected to the appliance until Step 6 (Page 25).

• 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. Appliances using Propane should have a sediment trap at the base of the tank.

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

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

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

RESTRICTOR

APPLIANCE REAR

VENT OUTLET

A vent restrictor may be needed when

horzontally terminating the vent system from

the rear of the appliance (when using the

appliance rear vent), install vent restrictor in

the rear vent of the fireplace outlet on

MPD-3530/4035/4540 series models, in any

installation that has a vertical vent run in

excess of three feet (0.914 meters).

VENT RESTRICTOR INSTALLATION

(REAR VENT)

INNER FIREPLACE

COLLAR

If needed, install the restrictor orientated as

shown, either from inside or outside the unit,

in the inner fireplace collar.

Step 3. PREPARING APPLIANCE VENT COLLAR (MPD-3530/4035/4540 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 16 for top vent usage and Figure 17 for rear, and the following steps to prepare the appropriate collar for use.

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

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

and securely tighten all four screws. 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.

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 solid fuel burning appliance. The vent pipe is tested to be run inside an enclosed wall (such as a chase). There is no requirement for inspection openings in the enclosing wall at any of the joints in the vent pipe.

Installation of Vent Restrictor

A vent restrictor may be needed with this appliance, install vent restrictor (provided) in the appliance top ﬂue outlet as shown in Figure 18 (MPDT-3328, MPD-3530, MPD-4035 and MPD-

4540) or rear ﬂue outlet as shown in Figure 19 (MPD-3530, MPD-4035 and MPD-4540). It is held in place by friction, only.

Note: The vent restrictor is included in the ﬁrebox.

ON MPD-3530/4035/4540 SERIES MODELS

(COMBINED TOP AND REAR VENT UNITS)

TOP VENT SEAL & COVER PLATE REMOVAL

WHEN USING THE TOP VENT

(OUTSIDE UNIT)

CABINET TOP

GASKET

VENT SEAL PLATE

SECURING SCREWS

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 34 and 35.

VENT RESTRICTOR INSTALLATION

(TOP VENT)

A vent restrictor may be needed when

vertically terminating the vent system above

the roof (when using the appliance top vent),

install vent restrictor in the top vent of the

fireplace outlet on MPD-3530/4035/4540

and MPDT-3328 series models.

If needed, install the restrictor orientated as

shown, either from inside or outside the unit,

in the inner fireplace collar.

RESTRICTOR

INNER

FIREPLACE

COLLAR

APPLIANCE TOP

VENT OUTLET

Figure 18

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 in stalled on unused vent collar. Failure to do so could result in leakage of ﬂue products into living space.

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.

TOP VENT

FIREBOX TOP

VENT

COVER PLATE

(INSIDE UNIT)

CROSS SECTION

COVER PLATE SECURING SCREWS

Figure 16

ON MPD-3530/4035/4540 SERIES MODELS

(COMBINED TOP AND REAR VENT UNITS)

REAR VENT SEAL & COVER PLATE REMOVAL

WHEN USING THE REAR VENT

COVER PLATE

SECURING SCREWS

LINTEL

SECURING

SCREWS

LINTEL

(INSIDE UNIT)

REAR VENT

CROSS SECTION

VENT SEAL PLATE

GASKET

SECURING SCREWS

CABINET BACK

(OUTSIDE UNIT)

Figure 17

Figure 19

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

TRAHCHTGNELNOITCESTNEV

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5.4 573.0 1 0 0 0 0 1

9 57.0 2 0 0 0 0 2

5.01 578.0 0 1 0 0 0 1

51 52.1 1 1 0 0 0 2

5.91 526.1 2 1 0 0

12 57.1 0 2 0 0 0 2

5.22 578.1 0 0 1 0 0 1

5.52 521.2 1 2 0 0 0 3

5.13 526.2 0 3 0 0 0 3

5.43 578.2 0 0 0 1 0 1

5.73 521.3 1 1 1 0 0 3

5.34 526.3 0 2 1 0 0 3

54 57.3 0 0 2 0 0 2

5.64 578.3 0 0 0 0 1 1

5.94 521.4 1 0 2 0 0 3

15 52.4 1 0 0 0 1 2

5.55 526.4 0 1 2 0 0 3 75 57.4 0 0 1 1 0 2 66 52.5 0 2 2 0 0 4

5.76 526.5 0 0 3 0 0 3 96 57.5 0 0 0 2 0 2 27 6 1 0 3 0 0 4

5.37 521.6 1 0 0 2 0 3

5.97 526.6 0 1 0 2 0 3 18 57.6 0 0 0 1 1 2 09 5.7 0 2 1 0 1 4

526.7 0 0 2 0 1 3 39 57.7 0 0 0 0 2 2 69 8 1 0 1 2 0 4

5.79 521.8 1 0 0 0 2 3

201 5.8 2 0 0 0 2 4

5.301 526.8 0 0 0 3 0 3

801 9 1 0 0 3 0 4 411 5.9 0 2 0 0 2 4 711 57.9 1 0 5 0 0 6

5.811 578.9 1 1 0 3 0 5

621 5.01 0 0 1 3 0 4

5.031 578.01 1 0 1 3 0 5 531 52.11 0 0 6 0 0 6 831 5.11 0 0 0 4 0 4

5.931 526.11 0 0 0 0 3 3

5.241 578.11 1 0 0 4 0 5

VERTICAL TERMINATION SYSTEMS (ROOF)

See Figure 20 and Figures 30 through 32 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™ pipe applications are shown in these Figures; Secure Flex™ pipe may also be used. A Vertical 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 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-(latest edition) (In Canada, the current CAN/CSA-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 20)

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 35 and 36 - 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)

Figure 20

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

TRAHCHTGNELNOITCESTNEV

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441 21 1 0 0 0 3 4 051 5.21 0 1 0 0 3 4

5.451 578.21 1 1 0 0 3 5

5.061 573.31 0 2 0 0 3 5

5.271 573.41 0 0 0 5 0 5 771 57.41 1 0 0 5 0 6 381 52.51 0 1 0 5 0 6 681 5.51 0 0 0 0 4 4

5.091 578.51 1 0 0 0 4 5

5.691 573.61 0 1 0 0 4 5

5.502 521.71 0 1 1 5 0 7 702 52.71 0 0 0 6 0 6

5.112 526.71 1 0 0 6 0 7

5.712 521.81 0 1 0 6 0 7

5.922 521.91 0 0 1 6 0 7

5.232 573.91 0 0 0 0 5 5 732 57.91 1 0 0 0 5 6

5.142 521.02 0 0 0 7 0 7 642 5.02 1 0 0 7 0 8 252 12 0 1 0 7 0 8 462 22 0 0 1 7 0 8 672 32 0 0 0 8 0 8 972 52.32 0 0 0 0 6 6

082 573.32

5.382 526.32 1 0 0 0 6 7

5.982 521.42 0 1 0 0 6 7

5.103 521.52 0 0 1 0 6 7

5.013 578.52 0 0 0 9 0 9 513 5.62 1 0 0 9 0 01

5.523 521.72 0 0 0 0 7 7 033 5.72 1 0 0 0 7 8 633 82 0 1 0 0 7 8 543 57.82 0 0 0 01 0 01

5.943 521.92 1 0 0 01 0 11 273 13 0 0 0 0 8 8

5.673 573.13 1 0 0 0 8 9

5.973 526.13 0 0 0 11 0 11

5.814 578.43 0 0 0 0 9 9 324 52.53 1 0 0 0 9 01 564 57.83 0 0 0 0 01 01

1 0 0 8 0 9

T O T A L

Q T Y

Effective Vent 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

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 7

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

First Vent Component

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

Locking Incline Channel

Dimple

Appliance collar

Vent / Appliance Collar

Connection

upper vent section with the opening of

1 inch (25.4 mm) minimum clearance to combustibles

Support Straps (Plumber’s tape)

8 feet (2.4 m)

Maximum

Blocking

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 14 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 25 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" (267mm x 267mm) inside dimensions, about this center mark (Figure 21).

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

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.

Figure 22

Arrow

Align the dimple (four places) of the

the locking incline channel on the lower vent section. Twist vent component clockwise to engage and seal until arrow and dimple align.

Dimple

Locking Incline Channel

Connected

Vent Sections

Vent / Vent Section

Connection

Arrow

Figure 23

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 22 ). 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.

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 23.

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 35 and 36.

E. Support the vertical vent run sections -

Note - Proper venting support is very important. The weight of the vent must not be supported by the ﬁreplace in any degree.

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 24.

Figure 21

B. Attach vent components to appliance Secure Vent SV4.5 direct vent system compo-

nents are unitized concentric pipe components featuring positive twist lock connections (see Figure 19 ).

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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Figure 24

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

El bow)

Swivel Joint

(360

swivel)

Storm Collar

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

clined 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 25.

Figure 25

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' (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) and slightly elevated plane in a direction away from the ﬁreplace 1/4" per foot (20 mm per

meter) of horizontal vent. Use a carpenter’s level to measure from a constant surface and adjust the support straps as necessary.

Framing Dimensions for Roof

Pitch C D 0/12 10-1/2 in. 10-1/2 in.

(267 mm) (267 mm) 6/12 10-1/2 in. 12 in.

(267 mm) (305 mm) 12/12 10-1/2 in. 17-3/4 in.

(267 mm) (451 mm)

Figure 26

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 27 ). 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.

Figure 28

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 5. The SV4.5CGV-1 Vertical Termination (Figure 29 ) 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.

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 26.

Figure 27

J. Install the storm collar - Install the storm collar, supplied with the ﬂashing, over the vent/ ﬂashing joint. See Figure 28. 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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Figure 29

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.

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) and recommended to be in a slightly elevated plane, in a direction away from the ﬁreplace of

1/4" rise per foot (20 mm per meter) which is ideal, though 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.

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 39 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 31: 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 32: Top Vent - TWO 90-DEGREE ELBOWS

Ceiling Firestop/Spacer SV4.5VF*

*When using Secure Flex, use

Ceiling Firestop/Spacer

TABLE B

H Maximum

(meters)

feet

(1.524)

(3.048)

(4.572)

(6.096)

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

H = 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.

An elbow is acceptable as 1 foot of vertical rise except where an elbow is the only vertical component in the system. See Figure 39.

V Minimum

feet

Elbow Only

(meters)

(0.305)

(0.610)

(0.914)

(1.219)

A Vent Restrictor, as shown in Figure 18 on Page 13, must be used in this

application.

Figure 30: Top Vent - STRAIGHT

WARNING

Separate sections of concentric ﬂexible vent pipe may NOT be joined together under any circumstances.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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.

Figure 33: 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 39.

Figure 34: Top 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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

HORIZONTAL (OUTSIDE WALL) TERMINATION SYSTEM

Figures 35, and Figures 39 to 44 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 pipe 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 8 on page 7 for location guidelines.

Secure Vent SV4.5 direct vent system components are unitized concentric pipe components featuring positive twist lock connection, (refer to Figure 22 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 25 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 9 on page 8. Cut and/or frame an opening, 10-1/2" x 12-1/8" (267 mm x 308mm) 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 21 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 22 on page 15).

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.

TYPICAL HORIZONTAL VENT INSTALLATION

Building

Support

Framing

SV4.5E90

ertical

Rise

Support

Brackets

Elbow

Ceiling

Firestop/Spacer

Figure 35

The unitized design of the Secure Vent compo- nents 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 23 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.

Horizontal / Inclined Run

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

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

Vent Sections

Support bracket spacing every 5 ft (1.52 m)

Fireplace

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 24 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 25 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 35, it is very important that the

horizontal/inclined run be maintained in a straight (no dips) and recommended to be in a slightly elevated plane, in a direction away from the ﬁreplace of 1/4" rise per foot (20 mm

per meter) which is ideal, though 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.

SV4.5HT-2 Termination

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

Siding

Stucco

1-1 /4" Maxi mum Rece ss of the Square Termination into Exterior Finishing Mate ria l

Exterior Surface of

Framing

6 in. to 9-1/4 in.

(152 to 235 mm)**

Exterior Surface of Siding

Interior Surface of

Finished Wall

Maximum wall thickness

10 in.(254 mm)**

SV4.5HT-2

Square Termination

Ma xi mu m Extent of Ve nt R un Se ct ion s Relativ e to Ext erior Su rf ac e of Framing

Last Vent Section. Use T e l es cop i c V e n t Section (SV4.5LA), If Necessary

Adapter

SV4.5RCH

SV4.5HT-2

Square Termination

Venting Connection and Exterior Wall Recessing of the

Horizontal Square Termination (SV4.5HT-2).

*Use silicone caulking to seal the t op an d sides of th e ter min atio n, u p t o t he underla yment, stu cco, or mas on r y w al l s ur fac e.

**For thicknesses greater than 10 inches, see Table 8.

*Caulk

Firestop/Spacer (SV4.5HF) shown on the exterior side of the wall. It

may also be installed on the

interior side.

SV4.5HT-2

Termination

10-1/2"

(267mm)

(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 inch Vent Section,

Telescopic vent section,

Elbow or Appliance Collar

See Figure 13 on page 11 for Min. Distance to Base

of Appliance.

Base of Appliance

(76 mm)

(25.4 mm)

Adapter

SV4.5RCH

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 in. (178 mm) to 11-1/4 in. (286 mm) inboard of the exterior surface to which the SV4.5 HT termination is to be attached, see Figure 37. 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 37, refer to Table 8 on page 21. This table lists the additional venting components needed (in addition to the termination and adapter) for a particular range of wall thicknesses.

K. Attach termination adapter - Attach the adapter (adapter - SV4.5RCH - provided with the termination) to the vent section or telescoping vent section), elbow or appliance collar as shown in Figure 36 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), SF4.5HF (Secure 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

36, and nail into place.

Figure 36

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

(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 out-

side the exterior wall, slide the collars of the termination onto the adapter (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 37.

SVHRK Snorkel Cap –The snorkel cap is designed to be ﬁtted into a basement window box. The SVHRK cap is for use with ﬂex vent The vertical distance between the inlet and outlet of the cap is 28 in. (711 mm). pipe.

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 Termina- tion Guard. See Page 36. This can be purchased at your local dealer.

Figure 37

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.

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.

Note: It is very important that the horizontal/inclined run be maintained in a straight (no dips) and recommended to be in a slightly elevated plane, in a direction away from the ﬁreplace of 1/4" rise per foot (20

mm per meter) which is ideal, though 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 - inches (mm)

Termination Kit Only 6 to 9-1/4 (152 to 235) Termination Kit and 6 In. Vent

Section (SV4.5L6) Termination Kit and 12 in.

Vent Section (SV4.5L12) Termination Kit and Tele-

scopic Section (SV4.5L12)

Table 8

10-3/4 to 14 (273 to 356)

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

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

Note: See Figure 37 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.

feet

Elbow Only

(meters)

Wall Firestop/ Spacer SV4.5HF**

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

See Table 3 as an aid in venting component selection for a particular range of exterior wall thicknesses.

Figure 39: 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)

SV4.5HF**

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

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

See Table 8 as an aid in venting component selection for a particular range of exterior wall thicknesses.

Figure 38: Rear Vent - NO 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.

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

See Table 8 as an aid in venting component selection for a particular range of exterior wall thicknesses.

Figure 40: Top Vent - ONE 90-DEGREE ELBOW - ELBOW CONNECTION NOT DIRECTLY AT APPLIANCE

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Ceiling

Firestop/

Spacer

SV4.5VF*

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.

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

feet

(meters)

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 8 on page 21 as an aid in venting component selection for a particular range of exterior wall thicknesses.

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

Figure 41: 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 8 on page 21 as an aid in venting component selection for a particular range of exterior wall thicknesses.

Figure 42: 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 39.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

HORIZONTAL VENT FIGURES/TABLES (continued)

Wall Firestop/Spacer SV4.5HF**

+ H1+ H

feet feet feet

Maximum

(meters)

H Maximum

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)

TABLE K

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

*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*

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.

Square termination (SV4.5HT-2) shown. See Table 8 on page 21 as an aid in venting component selection for a particular range of exterior wall thicknesses.

(meters)

V Minimum

(meters)

Figure 43: Rear Vent - THREE 90-DEGREE ELBOWS

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

Wall Firestop/Spacer SV4.5HF**

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

Wall Firestop/Spacer SV4.5HF**

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

See Table 8 on page 21 as an aid in venting component selection for a particular range of exterior wall thicknesses.

Ceiling Firestop/Spacer

SV4.5VF*

TABLE L

H Maximum

(meters)

feet

(1.524)

(3.048)

(4.572)

(6.096)

+ H1 = 20 feet (6.096 m) Max.

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

1 1

V Minimum

feet

Elbow Only

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 39.

(meters)

(0.305)

(0.610)

(0.914)

(1.219)

Figure 44: Top Vent - THREE 90-DEGREE ELBOWS

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

5" (127 mm)

Radius Minimum

Flexible Vent Section

GEAR CLAMPS

Adapter

(SV4.5RF)

Appl y ONLY M IL-PAC BLACK H IGH TEMPERATURE SEALANT (Catalog No. 10K81) to the outside surface of both collars of the adapter (be especially careful to fill the grooves of the outer collar to be covered by the flexible pipe ) and slide flex ible pipe over inn er and ou ter adap ter coll ars.

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

Adapter Outer Collar Overlap

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

Adapter Inner Collar Overlap

SECURING SCREW

(3 PLACES EQUALLY SPACED

JUST BELOW GEAR CLAMP)

Attach Adapter to Appliance

Collar, or Secure Vent Sections

SECURING SCREW

(3 PLACES EQUALLY SPACED

JUST BELOW GEAR CLAMP)

VERTICAL OR HORIZONTAL VENTING USING

SECURE FLEX KITS AND COMPONENTS

Secure Flex venting kits and components may be used in any venting application where rigid Secure Vent (SV4.5) direct vent components 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 adapter 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 adapter over the previously installed section or appliance collar, adjusting the radial alignment until the four locking dimples of the adapter are aligned with the inlets of the four incline channels of the last vent section or collar. Push on the adapter until it fully engages, then twist the adapter 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 adapter as follows (see Figure 45):

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 adapter 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 adapter

collar. Ensure the ﬂexible vent pipe completely engages the adapter 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 adapter 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 adapter 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.

Figure 45

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

the outer adapter 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 adapter

collar. Ensure the ﬂexible vent pipe completely engages the adapter collar to a distance of 1³⁄₄ 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 adapter 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 adapter 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 46. Support horizontal sections of ﬂex with metal straps at 2 foot (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 46

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 45 ) as it was attached to the adapter.

Note: Secure Flex vent must be attached to Secure Flex terminations only. DO NOT substitute Secure Vent terminations or the Secure Vent adapter for Secure Flex components. The collars of Secure Flex terminations and adapters have a different circumference than that used with the Secure Vent pipe. Additionally, Secure Flex components have an extended length center tube for use in attaching the ﬂexible vent.

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

TP-TH

APPLIANCE- MOUNTED ON/OFF SWITCH (OPTIONAL)

BK/W(1)

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

JUNCTION BOX

BLACK

120 V

WALL MOUNTED CONFIGURATION FOR FAN SWITCH (OPTIONAL)

WIRING DIAGRAM MILLIVOLT GAS VALVES

THERMOPILE

GAS VALVE

FAN

(OPTIONAL)

1. If any of the original wire as supplied must be replaced,

1. it must be replaced with Type AWM 105°C – 18 GA. wire.

2. 120V, 60Hz – Less than 3 amps.

Transf.

120 V.

24 V

Factory Wired Field Wired

Electronic Wiring Diagram (Honeywell)

Showing the Blower Wiring for the Optional

FBK-250 Kits

Gas Valve

IGNITER

Schematic Representation Only

*ON/OFF Switch (Integral

with Gas Valve)

Optional FBK-250 Module

*Leave the ON/OFF switch, which is integral

with the gas valve, in the ON position.

OPTIONAL APPLIANCE-MOUNTED ON/OFF SWITCH

OR OPTIONAL WALL SWITCH OR OPTIONAL THERMOSTAT

OR OPTIONAL REMOTE RECEIVER

PILOT

ASSEMBLY

OPT

BLOWER

Junction Box

White

Green

Red

Black

Neutral Side of Receptacle

Tab Intact

Green Ground Screw

Hot Side of Receptacle

Tab Broken

Optional

Accessory

Switch

120 VAC - Black

neerG-dnuorG

etihW-lartueN

1. If any of the original wire as supplied must be replaced,

1. it must be replaced with Type AWM 105°C – 18 GA. wire.

2. 120V, 60Hz – Less than 3 amps.

Transf. 120 V.

24 V

Factory Wired Field Wired

Electronic Wiring Diagram (Honeywell)

Showing the Blower Wiring for the Optional

FBK-100 and FBK-200 Kits

Gas Valve

IGNITER

*Blower speed control switch is provided in FBK200 blower kit.

Schematic Representation Only

**ON/OFF Switch (Integral

with Gas Valve)

**Leave the ON/OFF switch, which is integral

with the gas valve, in the ON position.

OPTIONAL APPLIANCE-MOUNTED ON/OFF SWITCH

OR OPTIONAL WALL SWITCH

OR OPTIONAL THERMOSTAT

OR OPTIONAL REMOTE RECEIVER

OPT

BLOWER

PILOT

ASSEMBLY

Junction Box

White

Green

Red

Black

Neutral Side of Receptacle

Tab Intact

Green Ground Screw

Hot Side of Receptacle

Tab Broken

120 VAC - Black

neerG-dnuorG

Optional

Accessory

Switch

etihW-lartueN

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.

Figure 48

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 47)

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, Unit-Mountable ON/OFF Switch*, Thermostat, Remote Control). See the ﬁreplace Care and Operation Instruc- tions 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 ther-

mostat, 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 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.

Verify proper operation after servicing.

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

Figure 47

CAUTION

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

B. Electronic Wiring

The electronic gas valve has an integrated ON/ OFF burner control switch. 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

Figure 49

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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 13, 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 48 & 49. 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.

(see Figures 48 & 49)

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

BLOWER CONTROL CIRCUIT WIRING

Receptacle

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 thermo-

stat 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 Figures

48 and 49.

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. If the optional control switch is installed,

turn the appliance-mounted ON/OFF burner control switch to the OFF position.

9. After the wiring is complete, replace the

cover plate.

Note: The gas valve-mounted ON/OFF switch is shown in Figures 48 and 49. It is integral with the gas valve and should be set to the ON position.

WARNING

neerG - dnuorG

etihW - lar

t ueN

Black

White

Green

Plug blower into this receptacle

Blower

Ground

120V, 60HZ, 1PH

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

120 VAC - Black

Junction Box

Tab Broken

Tab Intact

Field Wired

Factory Wired

Red

Hot Side of

Neutral Side of

Green Ground Screw

A sediment trap is recommended in the gas piping within the home to prevent moisture and debris in the line from damaging the valve.

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 51 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 52 ) 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.

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 48 on page 25) -

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.

Figure 50: Junction Box Wiring

FBK-250 Blower Kit

(See Figure 49 on page 25)-

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 50.

Step 7. CONNECTING GAS LINE

Make gas line connections. All codes require a shut-off valve mounted in the supply line. Figure 51 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.

Secure all joints tightly using appropriate tools and sealing compounds (ensure propane resistant compounds are used in propane applications).

All codes require a shut-off valve mounted in the supply line. The orientation of the shut-off valve should face the front. Figure 51 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.

TEST ALL CONNECTIONS FOR GAS LEAKS (FACTORY AND FIELD):

WARNING

Never use an open ﬂame to check for leaks.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

MILLIVOLT

Thermocouple

Hood Igniter Rod

3/8" Min (9 mm)

Thermopile

Pilot Nozzels

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

ELECTRONIC

Proper Flame

Adjustment

Pilot Nozzle

3/8 To 1/2 Inch

(9 mm to 13 mm)

Ground Electrode

Flame Rod

Hot Surface

Igniter

Subsequent lighting of the appliance will not require such purging. Inspect the pilot ﬂame (remove logs, if necessary, handling carefully).

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 53). Replace logs if removed for pilot inspection.

Figure 51: Gas Connection

SIT Gas Valve

Piezo

Ignitor

Millivolt Gas Valve Showing

Piezo Ignitor Location

Figure 52

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

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

B. Brush all joints and connections with the gas

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

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

be sure to rinse off the leak testing solution.

Step 8. VERIFYING APPLIANCE OPERATION

With gas line installed, run initial system 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 47 on Page 25.

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 52) 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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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).

Figure 53

Electronic Appliance Checkout

To light the burner, turn ‘ON’ the unit-mounted ON/OFF switch or the optional remote wall switch. Ensure the igniter lights the pilot. The pilot ﬂame should engulf the ﬂame rod as shown in Figure 54.

Figure 54

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

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

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 55

Step 3. Separate the Glowing Ember (Rockwool) into pieces about the size of a quarter (Figure 55 ). Keep the pieces ﬂuffed up, not matted. Distribute these pieces over the front surface of the burner, as shown in Figure 56. 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.

Figure 56

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 57, 58 and 59. 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 57 for MPD-3328 Series appliances, to Figure 58 for MPD-3530 Series appliances and to Figure 59 for MPD-4035 and MPD-4540 Series appliances.

REFERENCE

Firebox Accessories / Parts

Cat. No. Model No. Description

88L53 FGE Bag of Glowing Embers

80L42 FDVS

Bag of Decorative Volcanic Stone

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, vermiculite, embers and logs.

•

This appliance is not designed to burn wood. Any attempt to do so could cause irreparable damage to the appliance and prove hazardous to your safety.

•

If logs are not installed according to the log installation instructions, ﬂame impingement and improper combustion could occur and result in soot and/or excessive production of carbon monoxide (CO), a colorless, odorless, toxic gas.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

MPD-3328 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 57

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

MPD-3530 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: 24M22

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 58

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

MPD-4035 AND MPD-4540 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 56. 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 59

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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(s) 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.

Seules des portes certiﬁées pour cet appareil doivent être utilisées.

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

Removing the Glass Enclosure Panel (see Figure 60 )

Remove the top louver assembly or radiant panel.

To access the glass door securing latches, ﬁrst open the lower control compartment door (Figure 60 ) 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 60 )

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 60 ). 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 Bottom Vee-flange

Figure 60

Glass Door Frame Top Flange

Firebox Floor

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, ﬁrst 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 ﬂames 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.

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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

WARNINGS

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

• Ensure front glass panel are in place and sealed during adjustment.

CAUTIONS

• 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 61, 62 and 63 for proper

ﬂame appearance. 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 64.

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 ﬂame appears weak or sooty, adjust the air shutter, incrementally, to a more open position until the proper ﬂame appearance is achieved.

• If ﬂame remains blue, adjust the air shutter, incrementally, to a more closed position until the proper ﬂame appearance is achieved.

4. Leave the control knob (OFF/PILOT/ON)

in the ON position and the burner ON/OFF switch (and remote switches, if applicable) in the OFF postion.

5. When satisﬁed that the burner ﬂame appear-

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

Figure 61 MPD-3328 MODEL

Figure 62 MPD-3530 MODEL

Figure 63 MPD-4035 AND MPD-4540 MODEL

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

Adjustment Rod Up

(Fully Open Position)

Air Shutter

Burner Tube

Adjusting Set Screw

Adjustment Rod Down

(minimum air

opening position)

Figure 64

Step 12. HOOD INSTALLATION

Refer to Figures 65 and 66. All models must have hoods installed prior to operating.

On all clean face units, slide the hood into the slots on the lower edge of the radiant panel (Figure 65).

On louvered face units, slide the hood into the slots on the lower edge of the cabinet top (Figure 66).

FINISHING REQUIREMENTS

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8233-TDPM

.porP 61/3 )67.4(

.taN 23/1 )8.O(

8233-RDPM

.porP 61/3 )67.4(

.taN 23/1 )8.O(

0353-DPM

5304-DPM

0454-DPM

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.taN 8/1 )2.3(

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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 65 and 66 )

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.

Figure 65

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

Radiant panel

Top of Door Frame

Clean Face Models

This area must remain clear of combustible materials.

Header Spacing Top Standoff

Top of Appliance

Louvers

Top of Door Frame

Min. 1" (25 mm)

Hood must be installed as shown.

Louver Face Models

Figure 66

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

STEP 13. ATTACHING SAFETY-IN-OPERATION WARNINGS It is the installer’s 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 1-800-9-LENNOX

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 télécommande (Figure C). Choisissez la langue qui est principalement parlée dans la résidence du propriétaire. En cas de doute, collez l’étiquette en anglais.

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

Étiquettes de remplacement, n° cat. H8024

LENNOX HEARTH PRODUCTS 1-800-9-LENNOX

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 1-800-9-LENNOX

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

SAFETY LABEL

DIAGRAMS

Figure A

DIAGRAMMES DES ÉTIQUETTES

DE SÉCURITÉ

Figure B Figure C

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

DIAGRAMAS DE ETIQUETAS

DE SEGURIDAD

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

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

H2152 SV4.5CGV-1 Vertical Termination Cap,

High Wind

H4687 SV4.5CTS Chase Top Termination,

Square

(Ref. Instr. #750207M)

H4716 SV4.5CTS-B Chase Top Termination,

Square, Black

(Ref. Instr. #750207M)

H4717 SV4.5CTS-TC Chase Top Termination,

Square, Terra Cotta

(Ref. Instr. #750207M)

94L10* SV4.5HTSS Horizontal Small Square

Termination with Firestop/Spacer (96K80) and Adapter (74L61)

98L27* SV4.5HTSSL Horizontal Small Square-

Long Termination with Firestop/Spacer (96K80) and Adapter (74L61)

17M52 SV4.5HGS-1 Termination Guard,

Square (1 pack)

(Ref. 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)

Listed Secure Vent™ Components

Cat. No. Model Description

Vent Sections

(Rigid)

The following ﬂashings come packaged with a storm collar:

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

H5816 SV4.5-

TWSK10

Through Wall Shield Kit (used to shield the direct-vent pipe from blown insulation)

(Ref. Instr. #750247M)

77L78 SV4.5F Flat Roof Flashing

H5820 SV4.5HTSK Termination Shroud

(Guard) for Horizontal Square Termination (1 pack)

(Ref. Instr. #750246M)

H3907 SV4.5ARSA Attic Insulation Shield w/

adjustable height, 12"-22"

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", ﬂex

H1988 CTSA-33 Chase Top Shroud Kit,

Arch Top 3 X 3 Ft.,

(Ref. Instr. #750194M)

H1985 CTSO-33 Chase Top Shroud Kit,

Open Top 3 X 3 Ft.,

(Ref. Instr. #750193M)

H1987 CTSO-44 Chase Top Shroud Kit,

H2246 SV4.5HF-10 Firestop / Spacer-Horizon-

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

H2247 SV4.5VF-10 Firestop/Spacer-Vertical,

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

96K92 SV4.5SP Support Plate

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)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

*Only for use with MPDT/R-3328 and MPD-3530 models.

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) *

compressed ﬂex

(Ref. Instr. #750053M)

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

compressed ﬂex

(Ref. Instr. #750052M)

H2248 SF4.5HF-10 Firestop / Spacer -

Horizontal, ﬂex (3-1-1 spacing), 10 Pack

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

ﬂex (1-1-1 spacing), 10 Pk

56L74 SFVT30 Vertical Termination for ﬂex

(ﬂat to 6/12) with ﬂex adaptor,

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

(Ref. Instr. #750052M)

56L75 SFVT45 Vertical Termination for ﬂex

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

(Ref. Instr. #750052M)

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

for ﬂex (6 pack)

91L67 SFGC7-6 Gear Clamp 7.5 in. (190.5

mm) for ﬂex (6 pack)

H7748 H7748 36" Flex Connector

Kit. 36" of ﬂex with two adapters 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 ﬂex

77L88 SFKIT18S Square Term. for ﬂex

77L89 SFKIT24S Square Term. for ﬂex

77L90 SFKIT36S Square Term. for ﬂex

77L91 SFKIT48S Square Term. for ﬂex

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 ﬂex (without ﬂex vent)

(with 12 inch [305 mm] compressed ﬂex vent**)

(with 18 inch [457 mm] compressed ﬂex vent**)

(with 24 inch [610 mm] compressed ﬂex vent**)

(with 36 inch [914 mm] compressed ﬂex vent**)

(with 48 inch [1219 mm] compressed ﬂex vent**)

ﬂex, with 12 in. (305 mm) of compressed ﬂex vent**

(Ref. Instr. #750204M)

ﬂex, with 18 in. (457 mm) of compressed ﬂex vent**

(Ref. Instr. #750204M)

ﬂex, with 24 in. (610 mm) of compressed ﬂex vent**

(Ref. Instr. #750204M)

ﬂex, with 36 in. (914 mm) of compressed ﬂex vent**

(Ref. Instr. #750204M)

ﬂex, with 48 in. (1219 mm) of compressed ﬂex vent**

(Ref. Instr. #750204M)

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

*Only for use with MPDT/R-3328 and MPD-3530 models. **All compressed ﬂex vents can be expanded up to two times.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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/CSA-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/CSA-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.

Millivolt SIT Systems

Natural Gas To Propane Gas

Conversion Kits

Models Catalog No.

MPDT/R-3328 H2009

MPD-3530 H2011 MPD-4035 H2013 MPD-4540 H2015

Millivolt SIT Systems

Propane Gas to Natural Gas

Conversion Kits

Models Catalog No.

MPDT/R-3328 H2010

MPD-3530 H2012 MPD-4035 H2014 MPD-4540 H2016

Electronic HONEYWELL Systems

Natural Gas To Propane Gas

Conversion Kits

Models Catalog No.

MPDT/R-3328 26M59

MPD-3530 26M60 MPD-4035 26M61 MPD-4540 26M62

Electronic HONEYWELL Systems

Propane Gas To Natural Gas

Conversion Kits

Models Catalog No.

MPDT/R-3328 26M63

MPD-3530 26M64 MPD-4035 26M65 MPD-4540 26M66

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.

Open the bottom drop-down door. Open it (see

Figure 52 on page 27 ) by pushing in simultane- ously 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.

Remove the front glass door/frame from the appliance.

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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

Burner Assembly

Gas Valve Assembly

Orifice

Pressure Regulator

Remove These Components

Pilot

Orifice

Spring

Adjusting Screw

Slotted Cap

PSI

OFFION

CONTROL

IGNITE

Manifold Pressure Test Port

Inlet Pressure Test Port

Step 2. Carefully remove the logs. Exercise care so as not to break the logs.

Step 3. Refer to Figure 67.

A. Above the burner, remove the two bafﬂe

securing screws. Remove the bafﬂe.

B. Remove the two screws securing the trapezoidal plate to the burner. Remove the plate.

C. Remove the burner assembly with attached venturi tube.

Millivolt Appliances Step 4. SIT Systems - Refer to Figure 68 and

the instructions provided with the kit. Using a Torx T20, remove and discard the three pressure regulator mounting screws. Remove the pressure regulator, spring, poppet, diaphragm and bushing. Discard all removed components. Ensure the rubber gasket installed on the back of the replacement pressure regulator is properly positioned and install the new pressure regulator using the new screws supplied with the kit. Tighten screws to 25 In. lb. torque.

Figure 68

Electronic Appliances

Step 7. Honeywell Electronic Valves - See

Figure 70 and the instructions provided with the kit. Remove the slotted cap screw, o-ring, pressure-regulating adjusting screw and spring. Retain all parts for possible later use. Install new components from the kit. Black cap and red spring for propane gas units. Silver cap and stainless steel spring for natural gas units. Before installing the cap, attach manometer to the manifold side pressure test ﬁtting and adjust screw until pressure reads 3.5 inches water column (0.87 kPa) for natural gas, and 10.0 inches water column (2.49 kPa) for propane gas.

Figure 67

Step 5. Attach manometer to the manifold side pressure test ﬁtting and verify manifold pressure reads 3.5 inches water column (0.87 kPa) for natural gas, and 10.0 inches water column (2.49 kPa) for propane gas.

Step 6. Refer to Figure 69 and remove the pilot hood assembly to access the hexed pilot oriﬁce. Remove and replace the oriﬁce with the one provided with the kit.

Figure 69

Figure 70

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

Retaining

Clip

Ignitor Assembly

Pilot Assembly

Pilot Orifice

Flare Nut

See Figure 71 and replace the pilot oriﬁce as follows: Remove the ignitor assembly retainer clip, and carefully remove the ignitor assembly.

Exercise extreme care to prevent damage to or breakage of the ignitor assembly. Remove

the screw securing the pilot assembly to its mounting bracket. Back off the ﬂare nut at the end of the pilot gas line to free the pilot assembly from the gas line. Remove the pilot oriﬁce and replace it with the one provided with the conversion kit. Reinstall the pilot assembly by reversing the steps detailed here.

When reinstalling the ignitor assembly, use extreme care to prevent damage and breakage. Do not apply any leverage to the ignitor assembly while restoring the retainer clip to its original position.

Note: If the ignitor is damaged, a replacement kit is available, order Catalog Number 87L54.

Figure 71

All Models

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 8. (Refer to Figure 67 on page 39 ) A. Remove the oriﬁce from the manifold and

replace it with the one provided in the kit. See the following table for oriﬁce sizes for natural and propane models. Figure 72 illustrates the oriﬁce.

B. Retrieve the burner and hold the venturi tube above the oriﬁce . Place the shutter adjusting rod in the propane slot of the shutter arm (see Figure 64 on page 34 ). Set the burner assembly into its position and secure the trapezoidal plate with the two screws previously removed.

C. Reinstall the bafﬂe with the two bafﬂe securing screws.

Burner Oriﬁce Sizes

Elevation 0-4500 feet ( 0-1372 meters)

Model

Series

MPDT-3328 MPDR-3328

MPD-3530

MPD-4035

MPD-4540

Table 9

Nat.Gas

drill size (inches)

#45 (0.0820")*

39L66•

#44 (0.0860")*

60J80•

#37 (0.1040")*

24M10•

#36 (0.1065")*

18L40•

* Standard size installed at factory

• Part /Cat. Number

Propane

drill size (inches)

0.048 inch 99K78•

#55 (0.0520")*

19L52•

0.063 inch

21L01•

#52 (0.0635")*

37G00•

Figure 72

Step 9. Reassemble the remaining components by reversing the procedures outlined in the preceding steps.

Step 10. Attach the conversion label provided in the conversion kit next to the rating plate on the appliance.

Step 11. Turn on gas supply and test for gas leaks (refer to page 27).

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

NOTES

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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

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.

P/N 850014M Rev. V 08/2011

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

Lennox MPD-3530CPM-B, MPDR-3328CPE-B, MPDR-3328CPM-B, MPD-3530CNE-B, MPDR-3328CNE-B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual