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
US
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.
2
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
3
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
N
O
T
O
it
L
I
P
O
F
F
OUT
IN
Manifold Pressure Tap
Inlet Pressure Tap
Pilot Adjustment
I
P
W
O
L
H
I
HI/LO Variable
Flame Height
Adjustment
Screw
T
O
L
HTPTHTPT
Figure 1: SIT Millivolt Gas Valve
Electronic
Gas Control
Valve
P
SI
Inlet
Pressure
Port
IN
ON/OFF Switch Manifold Pressure Port
R
E
IT
IGN
ON
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.
4
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
APPLICATION
TOP VENT
INSTALLATION
VERTICAL VENT
(Rear Vent Application)
HORIZONTAL VENT
(Rear Vent Application with a chase)
RECESSED
REAR VENT
APPLICATION
TOP VENT
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.
5
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
H*
1 inch (25.4 mm) Minimum
Clearance to Combustibles
Vertical
Wall
X
12
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
A
bove Flat Or Sloped Roofs
ef. NFPA 54 / ANSI Z223.1
R
oof Pitch *H (ft) *H (m)
R
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)
6"
(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.
6
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
B
V
L
V
6”
Detail D
F
V
A
X
Ventilated Soffit
V
Fixed
Closed
Window
V
C
= Air Supply Inlet
C
C
C
V
Inside
Corner Detail
V
A
B
Operable
V
Window
B
B
= Vent Termination
G
B
= 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.
A
= 12” in Canada
3 ft.
X
A
J
A
3 ft.
P
N
V
Q
H
M
V
I
N
O
D
E
V
Figure 7
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
7
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.
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.
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
8
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
4
(102)
14
(356)
12
(305)
10
(254)
2 (51) MANTEL
TOP OF
APPLIANCE
6
(152)
NOTE - Hood shown as positioned in louvered
front model. The hood position in the flush
faced front model is lower than shown.
8
(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"
5"
Top View Of
Fireplace
Side
Wall
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
9
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
D
OAR
B
D
CAR
EFORE USING
B
Remove cardboard before using appliance.
Take care not to damage white gasket.
Figure 11
REMOVE
B
D
CAR
EFORE USING
B
D
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.
10
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
B
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
D
(130)
(178)
(178)
7
7
Framing should be
constructed of 2x4
or larger lumber.
C
E
A
1/2
A
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.
G
H
Concentric Flue:
Flue
4-1/2" (114 mm);
Combustion Air
7-1/2" (190 mm).
See Notes [1] and [2].
J
.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
E
A
D
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
3 (76)
in louvered front model.
Optional Electrical Inlet
C
B
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)
K
6 (152)
Right Side View
N
L
1/2 (13)
See Note [2].
1-5/8 (42)
M
F (rear vent
models only)
Electrical Inlet
2-3/4" x 2"
(70 x 51 mm)
Cover Plate
with Knockout
11
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)
3"
(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).
12
MPD and MPDR units
MPD and MPDT units
C
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.
b
F
7"
(178 mm)
E
D
a
A
B
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
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.
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.
13
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