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LENNOX HEARTH PRODUCTS  •  MERIT PLUS

®

 DIRECT VENT GAS FIREPLACES (MPD33/35/40/45)  •  INSTALLATION INSTRUCTIONS

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

HORIZONTAL VENT

(Rear Vent Application with a chase)

HORIZONTAL VENT

(Top Vent Application)

VERTICAL VENT

(Top Vent Application)

(Rear Vent Application)

VERTICAL VENT

(Rear Vent Application without a chase)

HORIZONTAL VENT

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. Util-

ity shelves like these are commonly used for 

locating television sets and decorative plants.

Be aware that this is a heat producing 

appliance. Objects placed above the unit are 

exposed to elevated temperatures.

do not insulate the space between the ap-

pliance and the area above it

 (

see

 Figure 8

)

.

The minimum height from the base of the appli-

ance to the underside of combustible materials 

used to construct a utility shelf in this fashion 

is shown in 

Figure 8

The appliance must be mounted on a fully 

supported base extending the full width 

and depth of the unit. The appliance may be 

located on or near conventional construction 

materials. However, if installed on combustible 

materials, such as carpeting, vinyl tile or other 

combustible material other than wood flooring, 

the appliance shall be installed on a metal or 

wood panel extending the full width and depth 

of the appliance.

COLd CLIMATE INSULATION

For cold climate installations, seal all cracks 

around your appliance with noncombustible 

material and wherever cold air could enter 

the room. It is especially important to insulate 

outside chase cavity between studs and under 

floor on which appliance rests, if floor is above 

ground level. Gas line holes and other openings 

should be caulked or stuffed with unfaced 

fiberglass insulation. 

If the fireplace is being installed on a cement 

slab in cold climates, a sheet of plywood or 

other raised platform can be placed underneath 

to prevent conduction of cold transferring to 

the fireplace and into the room. It also helps to 

sheetrock inside surfaces and tape for maximum 

air tightness and caulk firestops.

MANUFACTUREd HOME 

REQUIREMENTS

This appliance may be installed in an aftermarket 

permanently located, manufactured home 

and must be installed in accordance with the 

manufacturer's instructions. 

Cet appareil peut être installé cómme 

du matériel d'origine dans une maison 

préfabriquée (É.U. seulement) ou mobile 

et doit être installé selon les instructions 

du fabricant. 

This appliance is only for use with the type of 

gas indicated on the rating plate. This appliance 

is not convertible for use with other gases, 

unless a certified kit is used.

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 mem-
bers 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 ground-
ed 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. 

Figure 3 - Typical Locations

 APPLICA

TION

REAR VENT

 APPLICA

TION

TOP VENT

 APPLICATION

TOP VENT

REAR VENT  APPLICA

TION

TOP VENT  APPLICA

TION

RECESSED

INSTALLATION

TOP VENT

 APPLICATION

 APPLICA

TION

TOP VENT

 APPLICA

TION

TOP VENT

Summary of Contents for MPD35CNE

Page 1: ...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 GLAS...

Page 2: ...cal Installation Sequence 9 Detailed Installation Steps 9 Step 1 Framing 9 Fireplace and Framing Specifications 10 Step 2 Routing Gas Line 11 Step 3 Preparing Appliance Vent Collar 12 Step 4 Installin...

Page 3: ...is appliance can cause serious injury or death from fire burns explosion or carbon monoxide poisoning WARNING Failure to position the parts in accordance with these diagrams or failure to use only par...

Page 4: ...55 0 052 19L52 MPD40 38 0 102 99K76 0 062 21L01 MPD45 37 0 104 24M10 52 0 0635 37G00 Table 4 Standard size installed at factory Part Cat Number REQUIREMENTS FOR THE COMMONWEALTHOFMASSACHUSETTS These f...

Page 5: ...the appliance 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 imp...

Page 6: ...ents Above Flat Or Sloped Roofs Ref NFPA 54 ANSI Z223 1 Roof Pitch H ft H m Flat 6 12 1 0 0 3 6 12 7 12 1 25 0 38 7 12 8 12 1 5 0 46 8 12 9 12 2 0 0 61 9 12 10 12 2 5 0 76 10 12 11 12 3 25 0 99 11 12...

Page 7: ...er 5 12 7 cm 5 12 7 cm G Clearance to inside corner 2 5 08cm minimum SV4 5HT 2 6 15 2cm minimum SV4 5HTSS 2 5 08cm minimum SV4 5HT 2 6 15 2cm minimum SV4 5HTSS H Clearancetoeachinsideofcenterlineexten...

Page 8: ...ve 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 ve...

Page 9: ...the framing and secure with nailing brackets IMPORTANT Bend up the appropriate header spacing standoffs for the drywall finish material thickness to be used see Figure 11 Bend up the outer pair for 1...

Page 10: ...lectrical Inlet Knockout requiring a Field Provided Junction Box either side E B D C Front View 3 76 A Header Spacing Top Standoffs Vertical Venting through the Ceiling Frame ceiling opening Use a plu...

Page 11: ...aming 6 1 2 152 mm Pipe Coupling Recommended NOTE Rear Vent Applications in Corner Installations The horizontal vent length from a to b must not exceed 28 inches 711 mm MPDT33 and MPDR33 Models Dimens...

Page 12: ...ct Venting System Horizontal or Vertical Withtheappliancesecuredinframing determine ventroutingandidentifytheexteriortermination location The following sections describe vertical roof and horizontal e...

Page 13: ...4 1 1 0 0 5 0 6 3 8 1 5 2 5 1 0 1 0 5 0 6 6 8 1 5 5 1 0 0 0 0 4 4 5 0 9 1 5 7 8 5 1 1 0 0 0 4 5 5 6 9 1 5 7 3 6 1 0 1 0 0 4 5 5 5 0 2 5 2 1 7 1 0 1 1 5 0 7 7 0 2 5 2 7 1 0 0 0 6 0 6 5 1 1 2 5 2 6 7 1...

Page 14: ...e radial alignment until the four locking dimples are aligned with the inlet of the four inclined channels on the collar refer to Figure 21 Push the vent component againstthecollaruntilitfullyengages...

Page 15: ...llar 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 anyofthepreviouslyconnected...

Page 16: ...ou 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 TABLE A H M...

Page 17: ...6 096 4 1 219 H H1 20 feet 6 096 m Max V V1 H H1 40 ft 12 192 m Max meters meters Example If 20 feet of H horizontal vent run is needed then 4 feet minimum of V vertical vent will be required This tab...

Page 18: ...al 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 y...

Page 19: ...4 32 mm as shown in Figure 34 SVHRK Snorkel Cap The snorkel cap is designed to be fitted into a basement window box The SVHRK cap is for use with flex vent The vertical distance between the inlet and...

Page 20: ...owingwallthicknessrange when using SV4 5HT 2 termination kit HORIZONTAL Vent Figures Tables NOTE Secure Vent components rigid vent pipe and terminal are shown in the figures Secure Flex components fle...

Page 21: ...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...

Page 22: ...al rise except where an elbow is the only vertical component in the system See Figure 36 V Minimum feet feet 5 1 524 Elbow Only 5 1 524 1 0 305 10 3 048 2 0 610 15 4 572 3 0 914 20 6 096 4 1 219 meter...

Page 23: ...No 10K81 to the inner adaptor collar approximately 1 2 inch from the end 3 Pull and extend the inner flexible vent pipe 4 Slide the inner flex pipe over the adaptor collar Ensure the flexible vent pip...

Page 24: ...t 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 l...

Page 25: ...eplace The millivolt control valve has a 3 8 10mm 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 Secu...

Page 26: ...onovertime A Light the appliance refer to the lighting instructionslabelinthecontrolcompartment or in the Care and Operation Instructions manual B Brush all joints and connections with the gas leak te...

Page 27: ...pli ances to Figure 54 for MPD35 Series appli ancesandtoFigure55forMPD40andMPD45 Series appliances WARNING DO NOT attempt to install the logs until the appliance instal lationhasbeencompleted the gas...

Page 28: ...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...

Page 29: ...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 l...

Page 30: ...ividual logs as shown below Logs should be placed in the order shown Position the center log on the burner first then place the glowing embers as shown in Figure 52 Place the rear log both the right a...

Page 31: ...t appear sooty The following chart is provided to aid you in achieving the correct air shutter adjustment for your installation Figure 56 Removing the Glass Enclosure Panel see Figure 56 Remove the to...

Page 32: ...ireplace rod located in the lower control area Position the air shutter to the factory setting as shown in the table in Figure 60 2 Light appliance follow lighting procedure on lighting label in contr...

Page 33: ...bustible material may touch top of appliance Combustible materials NOT allowed below this point on face of appliance Header Spacing Top Standoff Top of Appliance Top of Door Frame Hood must be install...

Page 34: ...er la poussi re et les traces de graisse ou d huile Collez l tiquette sur la surface de la plaque de l interrupteur mural qui contr le le foyer Figure A ou du thermostat mural Figure B Choisissez la l...

Page 35: ...6 SV4 5HF 10 Firestop Spacer Hori zontal rigid 3 1 1 spac ing 10 Pack H2247 SV4 5VF 10 Firestop Spacer Verti cal rigid 1 1 1 spac ing 10 Pack 96K92 SV4 5SP Support Plate Installation Accessories Liste...

Page 36: ...T48SS Small Square Termination for flex with 48 1219 mm of compressed flex vent Ref Instr 750204M 94L09 SF HTSS Horizontal Small Square Termination for flex without flex vent Ref Instr 750204M INSTALL...

Page 37: ...pin located at the door s left side to the right until it disengages from the left corner post hole Pull the control compartment door diagonally to the left away from the fireplace Step 3 Remove the...

Page 38: ...crews previously removed Step 12 Reinstall the baffle with the two baffle securing screws Step 13 Reassemble the remaining compo nents by reversing the procedures outlined in the Steps 1 5 Step 14 Att...

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