Lennox MPB3328CNM-B, MPB3328CNE-B, MPB3530CNE-B, MPB3328CPM-B, MPB4540CNM-B User Manual

US

Portland

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.

- 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.

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

-

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.

•
department.

- Installation and service must be performed by a

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.

MPB B-Vent
Gas Fireplaces

P/N 850033M Rev. G 01/2011

This manual is one of a set of two supporting this product.
Refer to P/N 875031M for Care and Operation Instructions.

Ce manuel est disponible en francais, simplement
en faire la demande. Numéro de la pièce 850033CF.

MODELS

MILLIVOLT:

MPB3328CNM-B
MPB3328CPM-B
MPB3530CNM-B

OTL Report No. 116-F-36-5

MPB3530CPM-B
MPB4035CNM-B
MPB4540CNM-B

ELECTRONIC:

MPB3328CNE-B
MPB3530CNE-B

MPB4035CNE-B
MPB4540CNE-B

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.

TABLE OF CONTENTS

Packaging .........................................Page 2

Introduction ......................................Page 2

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

Massachusetts and New York

Requirements ................................Page 4

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

Manufactured Home Requirements ..Page 5

Location ............................................Page 5

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

Appliance and Vent Clearances ........Page 7

Detailed Installation Steps ................Page 8

Typical Installation Sequence ...........Page 8

Step 1. Framing ..............................Page 8

Framing Specifications ......................Page 9

Fireplace Specifications .....................Page 10

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

Step 3. Install the Venting System..Page 12

Step 4. Field Wiring ........................Page 13

Step 5. Optional Forced Air Blower . Page 14

Step 6. Connecting Gas Line ..........Page 14

Step 7. Outside Air Kit Installation . Page 15

Step 8. Verify Unit Operation ..........Page 16

Step 9. Install Grate, Vermiculite

Embers & Logs .................Page 16

Step 10. Installing Glass Enclosure

Panels ...............................Page 21

Step 11. Burner Adjustment .............Page 22

Step 12. Vent Operation Test and Safety

Limit Switch Operation ..................Page 23

Step 13. Hood Installation ................Page 24

Finishing Requirements ....................Page 24

Step 14. Attaching Safety-in-

Operation Warnings .....................Page 25

Gas Conversion Kits .........................Page 26

PACKAGING LIST

The assembled vented gas fireplace is pack­aged with:
1 - One log set located in firebox area.
2 - One envelope containing the literature pack-

age which consists of the care and operation
manual, installation instructions, safety in
operation warning labels and warranty;

envelope is located in the control area.
3 - One hood located behind the top panel.
4 - One bag of decorative volcanic stone located

in the control area.
5 - One bag of glowing embers (rockwool)

located in the control area.

INTRODUCTION

The Millivolt appliances have a millivolt gas
control valve with piezo ignition system. If any
optional accessories which require electrical
power are being installed, the electrical power
must be provided at the time of appliance
installation.

The Electronic appliances have an electronic
intermittent pilot ignition system. External
electrical power is required to operate these
units.

Use Only These Approved Vent Components

- These vented gas fireplaces are designed for
residential applications. They must be installed
with approved Type-B, double wall vent pipe
systems and a listed vent termination routed
to the outside atmosphere. Use only the proper
size listed below.

Required Pipe Diameter:
MPB-3328 series: Requires 4 in. (102 mm)
MPB-3530 series: Requires 5 in. (127 mm)
MPB-4035 series: Requires 5 in. (127 mm)
MPB-4540 series: Requires 6 in. (152 mm)

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.

Please read and understand these
instructions before beginning your

installation.

WARNING

B-Vent appliances are not
designed to operate in negatively
pressured environments (pres­sure within the home is less than
pressures outside). Significant
negatively pressured environ­ments caused by weather, home

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

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

design, or other devices may
impact the operation of these
appliances. Negative pres­sures may result in poor flame
appearance, sooting, damage to
property and/or severe personal
injury. Do not operate these

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.

appliances in negatively pres-

2

sured environments.

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.

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-36-5) to
ANSI Z21.50 (in Canada, CSA 2.22), and CAN/
CGA-2.17-M91 in both USA and Canada, as
vented gas fireplaces.

Both millivolt and electronic versions of these
appliances are listed by OMNI-Test Laborato­ries, Inc. for installation in bedrooms in the
United States (not approved in Canada) and
in Manufactured Homes.

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 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.

Outside Combustion Air Hook Up -

(All manufactured home installations require
the use of an Outside Combustion Air Hook­Up Kit)

These appliances are equipped with an integral
combustion air door and actuator arm. Com­bustion air kits are optional. Install as shown
in Step 7 on Page 15.

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 manually­modulated 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.

Millivolt Models with

Manually-Modulated Gas Valve

Natural Gas Propane Gas

Model Input Rate

MPB3328
MPB3530
MPB4035
MPB4540

(BTU/HR)
13,500 to 17,500 13,500 to 17,500
16,000 to 20,000 16,500 to 20,000
24,000 to 30,000 22,300 to 28,000
24,750 to 31,000 23,000 to 29,000

Input Rate

(BTU/HR)

Table 1

WARNING

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

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).

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

3

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Electronic Models - These electronic appliances
have a fixed rate gas valve and an electronic
intermittent pilot ignition system. External
electrical power is required to operate these
units. The BTU Input for these appliances is
shown in Table 2.

Electronic Models with

Fixed-Rate Gas Valve

Natural Gas Propane Gas

Model Input Rate

MPB3328
MPB3530
MPB4035
MPB4540

(BTU/HR)

17,500 17,500
20,000 20,000
30,000 28,000
31,000 29,000

Input Rate

(BTU/HR)

Table 2

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

Gas Valve Diagrams

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

HI/LO Variable
Flame Height
Adjustment

Pilot Adjustment
Screw

Manifold Pressure Tap

Inlet Pressure Tap

Main Gas

Control Knob

OFF/PILOT/ON

Figure 1 - SIT Millivolt Gas Valve

installation at elevations of 0-4500 feet (0-1372

Gas Pressure - All Models

Tables 3 and 4 show the appliances' inlet and
manifold gas pressure requirements:

Inlet Gas Supply Pressure

(all models)

Fuel # Minimum Maximum

Natural Gas

Propane

5.0" WC

(1.24 kPa)

11.0" WC

(2.74 kPa)

10.5" WC

(2.61 kPa)

13.0" WC

(3.23 kPa)

Table 3

meters) above sea level using the standard
burner orifice sizes (marked with an "*" in Table

5). 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.

• Changingtheburneroricetoasmallersize

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

Manifold Pressure

ON / OFF Switch

Port

Inlet
Pressure
Port

Electronic Gas
Control Valve

Figure 2 - Honeywell Electronic Gas Valve

Install the appliance according to the regulations

Manifold Gas Supply Pressure

(all models)

Fuel # Low

(millivolt only)

Natural

Gas

Propane

(Lo) 2.2" WC

(0.55 kPa)

(Lo) 6.3" WC

(1.57 kPa)

High

(Hi) 3.5" WC

(0.87 kPa)

(Hi) 10.0" WC

(2.49 kPa)

Table 4

Test gauge connections are provided on
the front of the millivolt gas control valve,
identified IN for the inlet and OUT for the
manifold side. A 1/8" NPT Test gauge connec­tion is provided at the inlet and outlet side of
the electronic gas control valve adjacent to the
outlet to the main burner.

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.

4

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.

NOTE: Flame appearance will diminish 4% per
thousand feet.

Burner Orifice Sizes

Elevation 0-4500 feet ( 0-1372 meters)

Model

Series

MPB-3328 #47 (.0785") *

MPB-3530 #44 (.086") *

MPB-4035 #37 (.104") *

MPB-4540 #36 (.1065") *

Table 5

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Nat.Gas

drill size (inches)

39L66 •

60J80 •

24M10 •

18L40 •

* Standard size installed at factory

• Part /Cat. Number

Propane

drill size (inches)

#1.2m (.048")*

99K78 •

#55 (.052") *

19L52 •

(.0625") *

1/16"

21L01 •

#52

(.0635") *

37G00 •

REQUIREMENTS FOR THE COMMON­WEALTH OF MASSACHUSETTS

Installation of 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. Sec. 5.08 2(a) through 2(e).

• Installationand repair must be done by a

plumber or gas fitter licensed in the Com­monwealth of Massachusetts.

• Theexible gas line connectorusedshall

not exceed 36 inches (92 centimeters) in
length.

• Theindividual manualshut-offmust be a

T-handle type valve.

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 (approval no. MEA 417-05-E), if the
following additional requirements are met -

• Anoutsideairkit(FOAK-4orFOAK-4LD)

must be installed. See Figure 22 on Page

16.

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 cold transfer 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 matéri­el 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.

Vertical
Venting

Shown with Outside Air Kit
installed (model FOAK-4 or

FOAK-4LD)

Note: 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.

Figure 3 - Typical Installations

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.

Offset

Venting

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.

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.

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.

Notes:

• An Outside Combustion Air Hook-Up Kit
must be installed (see Step 7, Page 15).

5

VENT TERMINATION CLEARANCES

Gas Vent Rule - Gas vent caps are not per-

mitted within 8 feet (2.4 mm) of a vertical wall
or similar obstruction. Gas vent caps that are
located 8' or more from a portion of a building
which extends at an angle greater than 45°
upward from the horizontal may terminate in
accordance with (Figure 4 ), provided that in no
case shall any discharge opening on the cap be
less than 2' (610 mm) horizontally from the roof
surface (National Fuel Gas Code ANSI Z223.1
(NFPA 54) 7.6.2) (CAN/CGA B149).

Multiple Terminations

These appliances may vent adjacent to and at
the same level with any other gas appliances
(including direct-vent appliances) provided that
there is at least 2 ft. (0.6m) between the proximal
edges of the vent caps. These appliances may
be vented adjacent to a chimney vent servicing
a solid fuel fireplace provided the B-vent cap
is at least 2 ft. (0.6m) away from the nearest
point of the chimney opening.

X

12

Roof Pitch is X/12

Minimum Height from Roof to
Lowest Discharge Opening

1“ (25 mm)
Minimum

Figure 4 - Vertical Vent Termination Clearances

Termination Heights For Vents

Above Flat Or Sloped Roofs

Ref. NFPA 54 / ANSI Z223.1, 7.6

Roof Pitch Feet Meters

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

6

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

MINIMUM CLEARANCES TO COMBUSTIBLES

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)

*Note - The side walls of mantels may protrude
beyond the front face of the fireplace a maximum
of 5 inches (127mm) at 0 inch clearance to the
sides of the fireplace.

Appliance And Vent Clearances

Maintain clearances from appliance to combustible materials as detailed
in Table 6 with the following exception: When the unit is installed with

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

is recessed, the side walls surrounding the unit must not extend beyond
the front edge of the unit (see Figure 3).

MINIMUM CLEARANCES

Inches (millimeters)

Back 1/2 (13)

Sides 1/2 (13)

Top Spacers 0 (0)

Floor 0 (0)

Bottom of Appliance

To Ceiling

64 (1626)

Vent 1 (25.4)

SERVICE CLEARANCES

Feet (meters)

Front 3 ft. (0.9 m)

Table 6

Hearth Extension - A hearth extension is not required with this appliance.
If a hearth extension is used, do not block the control compartment access
panel. Any hearth extension used is for appearance only and does not have
to conform to standard hearth extension installation requirements.

Figure 5 - Minimum Mantel Clearances

0” Clearance
to Combustible
Side Wall

Ceiling

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 top spacers.
Never allow combustible materials to be positioned in front of or overlap­ping the appliance front face and top spacers. See Figure 38.

Non-combustible materials, such as surrounds and other appliance trim,
may be installed on the appliance front face with these exceptions: The

material must NOT cover any portion of the glass or louvers.

Vertical installation clearances to combustible mantels vary according to
the depth of the mantel (refer to Figure 5). 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 hood.

These instructions should be used as a guideline and do not supersede
local codes in any way.

64 in.

(1626 mm)

Bottom of Fireplace

Figure 6

*Note: See Figures 7 and 8 on Page 8 for clearance requirements to

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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

7

WARNING

Note: The nailing flanges, combustible members
and screw heads located 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 of this manual.

Side

Framing

Unit Nailing Flange

(No clearance to

combustible

framing is required)

Left Side Front Corner of Fireplace Shown

(Right Side Requirements the Same)

Unit Being Secured By Its Nailing Flanges

To The Framing

Anchor
Ta b

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

AVERTISSEMENT

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

DETAILED INSTALLATION STEPS

The appliance is shipped with all gas controls
and components installed and pre-wired.

1. Remove the shipping carton. Remove the
shipping pad, exposing the front glass
door.

2. Open the two latches (located under the fire­box floor) securing the glass door. Remove
the door by tilting it outward at the bottom
and lifting it up. Set the door aside protecting
it from inadvertent damage. See Removing
Glass Enclosure Panel on Page 21.

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 Page numbers references in the follow­ing steps for detailed procedures.

Step 1. ( Page 8) - Construct the appliance

Step 2. (Page 11) Route gas supply line to

Step 3. ( Page 12) Install the vent system and

Step 4. ( Page 13) Field Wiring

a. Millivolt Appliances – Install the

b. Electronic Appliances – Connect

Step 5. (Page 14) Install the optional

Step 6. (Page 14) Make connection to gas

8

framing. Position the appliance
within the framing and secure with
nailing flanges.

appliance location.

exterior termination.

OFF/ON burner control switch.

120 VAC electrical power to the appli­ance receptacle.

blower.

supply.

Step 7. (Page 15) Outside Air Kit Installa-

tion.

Step 8. (Page 16) Verify appliance opera-

tion.

Step 9. ( Page 16) Install grate, vermiculite,

embers and logs.

Step 10. (Page 21) Installation/Removal of

glass enclosure panels.

Step 11. (Page 22) Adjust burner primary

air shutter to achieve proper flame
appearance.

Step 12. (Page 23) Vent operation test and

(safety limit) switch operation.

Step 13. (Page 24) Install the decorative trims

and hoods.

Step 14. (Page 25) Attach Safety in Operation

Warnings.

Step 1. FRAMING

Frame these appliances as illustrated in Figure

9. All framing details must allow for a minimum

clearance to combustible framing members as
shown in Table 6 on Page 7.

If the appliance is to be elevated above floor
level, a solid continuous platform must be
constructed below the appliance.

Note: The framed depth, 16 in. (406 mm) from
a framed wall, must always be measured from
a finished surface. If a wall covering such as
drywall is to be attached to the rear wall, then
the 16 in. (406 mm) must be measured from
the drywall surface. It is important that this
dimension be exact.

Headers may be in direct contact with the
appliance top spacers 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.

Pre-installation Notes

The fireplace may be positioned and then the
framing built around it, or the framing may be
constructed and the fireplace positioned into
the opening.

Usually, no special floor support is needed for
the fireplace, however, to be certain:

1. Estimate the total weight of the fireplace
system and surround materials such as
brick, stone, etc., to be installed.

2. Measure the square footage of the floor space
to be occupied by the system, surrounds and
hearth extensions.

3. Note the floor construction, i.e. 2 x 6’s, 2 x
8’s or 2 x 10’s, single or double joists, type
and thickness of floor boards.

4. Use this information and consult your local
building code to determine if you need ad­ditional support.

Side Nailing Flanges

The fireplace should be secured to the side
framing members using the unit's nailing
flanges - two at the top and bottom on each
side of the fireplace front. See Figure 7. Use
8d nails or their equivalent.

Floor Nailing Tabs

Fireplace may be anchored to floor. Bend down
two anchor tabs (one on each side) located
at the base of the fireplace and secure to the
floor by nailing with 8d nails or equivalent

(Figure 8).

Figure 7

Note:
Some units only have one anchor tab on each side.

Figure 8

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

FRAMING SPECIFICATIONS

*Optional FOAK

Outside

Air Kit

A

Outside Chase

G

C

J

Back Wall of Chase/Enclosure

Including Finishing Materials

if any

Rough Framing Face

(Unfinished Shown)

Header

B

A

Fireplace Framing

C

A

G

Inside Chase

Back Wall of Chase/Enclosure

Including Finishing Materials

if any

Rough

Framing Face

(Unfinished Shown)

H H

Corner Installation

K

D

C

A
E

G

F

Back Wall of Chase/Enclosure

Including Finishing Materials

if any

Rough

Framing Face

(Unfinished Shown)

.oNledoM

A

tinU

eziS

A

gnimarF

eziS

BCDEFGHJ K

.ni538/1-534/1-534/1-918/5-91752/1-4/3-82614 61/9-68/5-04
mm29859859838489406410376042017612301
.ni8/1-044/1-044/1-04428/5-4261/31-1661/1-03614 61/9-623/11-34
mm91012201220101652607519776042017611011
.ni8/1-044/1-544/1-04428/5-928/3-6661/3-33614 61/9-661/51-64
mm64119411220101625768613486042017612911

MPB3328

MPB3530

MPB4035

MPB4540

in.

mm

845

842

33-1/4

845

33-1/4

546

21-1/2

286

11-1/4

1232

48-1/2

616

24-1/4

330

13

102

4

103

4-1/16

872

34-5/1633-1/8

12-3/4

14-11/16

17-3/16

437

373

324

1146

45-1/8

24-7/8

29-7/8

34-7/8

886

759

632

30-11/16

7-1/16

7-1/16

7-1/16

179

179

179

Note: All framing dimensions calculated for 1/2" dry wall at the appliance face. If sheathing the chase or finishing with other thickness
materials, calculations will need to be made.

* Outside air kit - FOAK (without adapter). See Figure 22 on Page 16.

Figure 9

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

9

F

E

B

D

C

G

Top View

FRAMING
SPACERS

(Top and Sides

and Rear)

Front View

3 (76)

A

J

H

Flue Outlet For B-Vent Connection

OPTIONAL ELECTRICAL

INLET KNOCKOUT

REQUIRING A FIELD

PROVIDED JUNCTION

BOX (Either Side)

GAS INLET
(Either Side
and bottom)

NOTE - Hood shown

as positioned

in louvered

front model.

ELECTRICAL INLET
2-3/4 x 2 (70 x 51) COVER
PLATE with KNOCKOUT)

K

1/2 (13)

3 (76)
1³⁄₈
(35)

(140)

5-1/2

9-3/8

(238)

2

(53)

Right Side View

(140)

5-1/2

9-3/8
(238)

1-3/8

(35)

Left Side View

GAS INLET

(See Also

Right Side View)

ELECTRICAL INLET

(See Also

Right Side View)

3

(76)

OUTSIDE AIR

SHUTTER

8-15/16

(227)

7-3/8

(187)

ELECTRICAL

INLET

(Optional)

.oNledoMABCDEFG

.ni538/1-8/1-23912/1-92538/1-8/-61/7-258-3/4

13

330

406

16

406

16

406

16

mm298618384947298236613721 222
.ni8/1-048/1-73422/1-438/1-048/7-92161/51-458-3/4
mm91013490166789101957973721

22

2
.ni8/1-048/1-73422/1-938/1-548/7-4361/7-7168-3/4
mm641134901630016411688344251 222

MPB3328

MPB3530

MPB4035

MPB4540

in.

mm

33-1/8

841 432

765 841

699

21-1/2

33-1/8

4

546

102273

27-1/2

1730-1/8

24-7/8

621

12-7/16

10-3/4

J

K

H

6-1/2

165

FIREPLACE SPECIFICATIONS

10

Figure 10

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Step 2. ROUTE GAS SUPPLY LINE

Route a 1/2" (13 mm) gas line as shown in
Figure 11. Gas lines must be routed, con­structed and made of materials that are in strict
accordance with local codes and regulations.
The appliance, as set up at the factory, is best
suited for use with a gas line routed from the
right side. The gas line may however be alter­nately routed from the left side. All appliances
are factory-equipped with a flexible gas line
connector and 1/2 inch shutoff valve. (See

Step 6 on Page 14).

Right Side Front
Corner of Fireplace
Framing

Also see

Figure 10

3"

6 1/2"

(152 mm)

Figure 11 - 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 B149 - latest
edition (Canada).

(76 mm)

Never use galvanized or plastic pipe. Refer
to Table 7 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 7

Notes:

• All appliances are factory-equipped with a

flexible gas line connector and 1/2 inch shutoff
valve (see Figure 20 on Page 15).

• 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 14).

• 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 (see Figure 20, Page 15). Appliances
using propane should have a sediment trap at
the base of the tank.

• Checkwithlocalbuildingofcial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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

11

Back View

Of Appliance

10 ft.

Minimum

Back View

Of Appliance

*12 ft. Min.

**15 ft. Min.

Back View

Of Appliance

*12 ft. Min.

**15 ft. Min.

*with an offset up to 45 degrees
** with an offset greater than 45

degrees and up to 60 degrees

Step 3. INSTALL THE VENT SYSTEM &
EXTERIOR TERMINATION:

General Information

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.

Use only approved venting components.
See Approved Vent Components on

Page 2.

These fireplaces must be vented directly
to the outside.

Slip the first section of B-Vent over the fireplace
flue outlet and secure with four sheetmetal
screws (# 8 or larger), and install the remainder
of the B-Vent to the outside. Minimum overall
height of the vent system and appliance must
be 10' (2.54 m) vertical - no offset (see Figure

13); or 12' (3.7 m) when an offset up to 45
degrees from the vertical is used: or 15' (4.6
m) when an offset is greater than 45 degrees
and up to 60 degrees.

The offset may start at the fireplace flue collar
(see Figure 13). The maximum overall height
of the vent system and appliance should not
exceed 40 feet.

Vertical

Installations

The maximum overall height of the vent system
and appliance should not exceed 40 feet.

Figure 13

USE ONLY APPROVED B-VENT DIAMETER

MPB-3328, MPB-3530, MPB-4035 and MPB­4540 series fireplaces must be vertically
vented using listed type-B, double-walled
vent pipe with the proper diameter as listed
below and a listed vent termination.

Required Pipe Diameter:
MPB-3328 series: Requires 4 in. (102 mm)

MPB-3530 series: Requires 5 in. (127 mm)
MPB-4035 series: Requires 5 in. (127 mm)
MPB-4540 series: Requires 6 in. (152 mm)

Offset

Installations

CAUTION

This appliance cannot be vented
horizontally.

Note: Refer to the vent manufacturers instal­lation instructions for variations of venting
techniques. If common venting of several units
is contemplated, it should be discussed with an
architect and the local Building Department.

Do not place insulation materials within 1 in.
of the gas vent system.

Install the B-vent system in accordance with
the vent manufacturer's instructions.

Type B-Vent - 4 in. (102 mm) for MPB 3328 Models,
5 in. (127 mm) for MPB 3530 / 4035 Models or 6 in.
(153 mm) for MPB 4540 Models

Figure 12

12

Securing
Screws

Flue Outlet
Collar

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

SIT Millivolt Wiring Diagram

If any of the original wire as supplied must be replaced,
it must be replaced with Type AWM105°C– 18 GA. wire.

Thermopile

HT

PT

HT

PT

*TWIST WIRES “A” AND “B” TOGETHER TO OPERATE UNIT
SOLELY BY MANIPULATING THE GAS VALV E CONTROL KNOB;
OR CONNECT WIRES TO OPTIONAL ON/OFF SWITCH OR WALL

SWITCH OR THERMOSTAT OR REMOTE CONTROL RECEIVER

TO OPERATE UNIT.

*OPTIONAL ON/OFF SWITCH,

WALL SWITCH, THERMOSTAT

OR REMOTE CONTROL RECEIVER

AB

HCTIWS TIMIL

WT

BK

BK

BK

Schematic Representation Only

Step 4. FIELD WIRING

BLOWER CONTROL CIRCUIT WIRING

120V, 60HZ, 1PH

Factory Wired

Ground

Field Wired

Junction Box

Tab Intact

Tab
Broken

Plug blower
into this
receptacle

neerG - dnuorG

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

Blower

etihW - lar

t
ueN

120 VAC - Black

Green
Ground
Screw

White

Green

Neutral
Side of
Receptacle

Hot
Side of
Receptacle

Red

Black

CAUTION

Ground supply lead must be con­nected to the wire attached to the
green ground screw located on
the outlet box. See

18. Failure to do so will result in a

Figures 17 or

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.

the current CSA C22-1 Canadian Elec­trical Code).

CAUTION: Label all wires prior to disconnec­tion when servicing controls. Wiring errors can
cause improper and dangerous operation.

ATTENTION: Au moment de l'entretien des
commandes, étiquetez tous les fils avant de
les débrancher. Des erreurs de cáblage peu­vent entraîner un fonctionnement inadéquat
et dangereux.

Verify proper operation after servicing.

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

(In Canada,

A. SIT Millivolt Wiring
(See Figure 14) –

1. Select any of the following optional controls:

appliance-mounted (rocker switch) or wall­mounted switch, thermostat, or one of the
optional remote control kits. If appliance­mounted ON/OFF control is selected mount
it in the gas valve mounting bracket.

2. If wall-mounted ON/OFF control switch or

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

3. Wire the control switch within the millivolt

control circuit using the 15 feet of 2 conduc­tor wire supplied with the unit . Caution: do

not connect the optional wall switch to a
120V power supply.

4. Alternatively, the appliance may be operated

without the use of the controls indicated
in Instruction #1, solely by manipulating
the gas valve control knob. In order to use
this method, twist the free ends of the two
conductor wire (located in the lower com­partment of the unit) together as shown in

Figure 14.

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 inside the control compart­ment.

B. Electronic Wiring (See Figures 17 or 18) –

Note: The electronic appliance must be con-

nected to the main power supply.

A junction box is located at the rear of the con­trol compartment on either side of the cabinet.
The junction box on the right side contains a
factory installed and wired outlet box (duplex
receptacle). Also, an optional field-provided
junction box with receptacle may be installed at
the front of the control compartment on either
side of the cabinet. See Figure 15. It will be
held in place by a conduit fitting and locknut
(field-provided).

1. Route a 3-wire 120Vac 60Hz 1ph power

supply to the appliance junction box.

See Figure 10 on Page 10
for Optional Electrical Inlet
Knockout Location.

* Field-Provided
Junction Box and
Duplex Receptacle

* Narrow (2-1/8 Inch Wide)
J-Box Required

Optional J-Box/Outlet Box

Figure 15

(Left Side Shown)

TROL SWITCH TO 120 V POWER SUPPLY.

CAUTION: DO NOT CONNECT OPTIONAL CON-

CAUTION: REMOVE THE CARTON SUPPORT
FROM THE CONTROL COMPARTMENT BEFORE
OPERATING THE APPLIANCE.

CAUTION: ENSURE THAT WIRES ARE POSI­TIONED AWAY FROM HOT SURFACES AND
SHARP EDGES.

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.

Figure 14

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Figure 16: Junction Box Wiring

13

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.

BK

Junction Box

Transf.

120 V.

24 V

Factory Wired Field Wired

BL

Electronic Wiring Diagram (Honeywell)

Showing the Blower Wiring for the Optional

FBK-100 and FBK-200 Kits

R

W

BL

OPT

BLOWER

G

W

*OPTIONAL
ACCESSORY

SWITCH

120

VAC.

BK

W

Gas Valve

B

R

IGNITER

PILOT

ASSEMBLY

Break Off

Tab

BK

G

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

Outlet Box

Green Ground

Screw

Hot side of Outlet

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.

Red
pigtail

Black
pigtail

White Wire
to Opposite

Side

G

LIMIT SWITCH

OPTIONAL WALL SWITCH

OR OPTIONAL THERMOSTA

T OR

OPTIONAL REMOTE RECEIVER

BK BK

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.

BK

Junction Box

Transf.
120 V.

24 V

Factory Wired Field Wired

BL

Electronic Wiring Diagram (Honeywell)

Showing the Blower Wiring for the Optional

FBK-250 Kits

R

BL

OPT

BLOWER

G

W

120

VAC.

BK

W

Gas Valve

B

R

IGNITER

PILOT

ASSEMBLY

BK

Outlet Box Green

Ground Screw

Hot side of Outlet

Schematic Representation Only

*ON/OFF Switch (Integral

with Gas Valve)

White Wire

To Opposite

Side

Optional FBK-250

Module

*Leave the ON/OFF switch, which is integral

with the gas valve, in the ON position.

OPTIONAL ON/OFF SWITCH,

WALL SWITCH, THERMOSTAT

OR REMOTE CONTROL RECEIVER

G

W

LIMIT SWITCH

BK

BK

Control
Valve

Lower Control
Compartment
Door

Open the lower panel or louver assembly by

pushing in the right side of the panel or louver

assembly and then lowering it forward and

down.

2. If the factory-provided outlet/junction box at

the right rear of the fireplace is being used,
remove the outlet box from the junction box
by removing two screws.

3. Connect the power supply wires (includ­ing the ground supply wire) as shown in

Figures 17 and 18. (If the field-provided
J-box/outlet box is being used, all of the
outlet box wiring must be field-provided).

4. Locate and install a low voltage (24V)
wall-mounted switch or thermostat (both
field-provided) in the desired location.

5. Connect the low voltage wire, located in
the lower control compartment, to the wall­mounted switch or thermostat.

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 inside the control
compartment.

6. Insert the control circuit plug into the un­switched receptacle of the outlet box.

7. After wiring is complete, mount the outlet

box to the J-Box.

Note: The gas valve-mounted ON/OFF switch

is shown in Figures 17 and 18. It is integral
with the gas valve and should be set to the
ON position.

Step 6. CONNECTING GAS LINE

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

The flex-line method is acceptable in the U.S.A.
where local codes permit, however, Canadian
requirements vary depending on locality. Instal­lation must be in compliance with local codes.
These appliances are equipped with a gas flex­line for use in connecting the unit to the gas line.
See Figure 20 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 19).

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.

Step. 5 WIRING - OPTIONAL FORCED
AIR BLOWER KIT

FBK-100, FBK-200 and FBK250 Kits

(See Figure 17 for FBK-100, FBK-200 and
Figure 18 for FBK-250 wiring) -

An electrical outlet box (receptacle) is factory

-provided for the installation of the FBK-100,
FBK-200 and FBK-250 forced air blower kits.
(An optional field-provided outletbox/J-Box
may also be used. Electrical power must be
connected to either of these receptacles in order
to operate these blowers. Install the blower
kits according to the installation instructions
provided with the kits.

Note: The tab connecting the receptacles of
the outlet box must be broken in FBK-100 and
FBK-200 blower kit applications. See Figure
16 on page 13.

14

Figure 17

Figure 18

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

OPENING CONTROL

COMPARTMENT DOOR

Figure 19

Secure all joints tightly using appropriate
tools and sealing compounds (ensure propane
resistant compounds are used in propane ap­plications). It is recommended to seal around
the gas line to prevent cold air leakage.

Acquire the shut-off valve and gas lex line and
pull the assembly forward out of the compart­ment. Separate the shut-off valve from the gas
flex-line. Determine the length of pipe needed
to route the gas line from the last fitting (shown
in Figure 20 on Page 15) to a point within the
control compartment that will allow the shut­off valve to be easily attached by hand to the
gas flex-line.

Outside Air Control Lever

Outside Air Control Lever

Securing screw

Air Shutter in Closed Position

Outside Air Control Lever

Outside Air Control Lever

Securing Screw Removed

Air Shutter in Open Position

Gas
Valve

3/8" NPT x

Flare Fitting

3/8" Flex Tubing

3/8" Nipple

3/8" Union

3/8" Close
Nipple

3/8" Shut-off Valve

1/2" x 3/8"

Reducer

Gas

Stub

1/2" x 3/8" Flare

Shut-off Valve

Gas Solid Line Connector

Gas Flex Line Connector

*Sediment
Trap

3"

Min

Figure 20 - GAS CONNECTION

Using pipe-dressing materials appropriate for
the gas type, securely affix the shut-off valve
to this determined pipe length at a convenient
location outside of the appliance lower control

compartment.

Note: The gas supply line
must be installed in accor­dance with building codes
by a qualified installer
approved and/or licensed
as required by the locality.
In the Commonwealth of
Massachusetts, installa­tion must be performed
by a licensed plumber or
gas fitter.

Outside air drawn into the fireplace supplies
air to the fire for combustion. Only one outside
air duct is necessary, if installed. See Figure
3 on Page 5 and Figure 22 on Page 16 for the
location of the unit's outside air inlet.

After completing the installation of the optional
outside air vent system the outside air control
lever must be put in service and tested to en­sure proper operation before completing any
enclosure around the firebox. Failure to do
so may result in extensive and costly rework.
Before the operation of the vent system can
be tested, the lever securing screw must be
removed. See Figure 21.

The hand operated outside air control lever is
located on the left side of the fireplace opening.

See Figure 21.

To open the outside air shutter, open the bot­tom control access panel, reach into the control
compartment, and pull the outside air control
lever all the way out. The outside air shutter
should be fully open when the fireplace is in use
and completely closed when the fireplace is not
being used. Closing it when not in use will prevent
outside cold air from entering the dwelling.

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

Never use an open flame to
check for leaks.

Turn on gas supply and test for gas leaks us­ing 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

Step 7. OUTSIDE AIR KITS

Optional outside make-up air kits, Model FOAK­4 or FAOK-4LD (see Figure 22 on Page 16),
may be used with these appliances. Refer to
the installation instructions packaged with the
air kits for specific installation information.
If used, the outside air kit must be installed
before the fireplace is framed and enclosed in
the finished wall.

sure to rinse off the leak testing solution.

WARNING

If additional length of duct is necessary, pur­chase locally available U.L. Class 0 or Class 1
metallic ducting. The duct may extend up to 50'
(15.24 m) in any direction.

Note: When installing the air duct vertically, DO
NOT terminate the duct closer than 3' below

the chimney top.

Outside combustion air ducting may be run
upwards or vertically through framing and ceil­ing joists, with the hood installed through an
outside wall and 3' (1 m) below the termination.
Ducting may also be run downward through
floor joists and under the home to a ventilated
crawlspace not considered part of the living
area of the home.

Note: Do not terminate outside air kit in attic
space under any circumstances.

CAUTION

Never locate inlet where it can be
blocked by shrubs, snow drifts,
etc. Never locate inlet in garage
or any area where there is another
fuel burning appliance or products
emitting combustible gases such
as paint, gasoline, etc. In cold
climates, it is recommended the
outside air duct be insulated.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Outside Air Control Lever

and Securing Screw Location

on Left Side of Cabinet in Lower Control

Compartment Area

Figure 21

Operate the actuator through several cycles
including the closed position. Ensuring proper
operation and freedom of movement. Return
the actuator arm to the closed position.

15

SIT 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.

Step 9. INSTALLING LOGS, DECORA­TIVE VOLCANIC STONE AND GLOW­ING EMBERS

(ref. Form # 750,008M)

Outside Combustion Air Kits

Cat. No. Model No. Description

81L87 FOAK-4 Combustion Air Kit (w/duct)

81L88 FOAK-4LD Combustion Air Kit (w/o duct)

Figure 22

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 Instructions manual. For
piezo igniter location see Figure 23

Note: Instructions are also found on the litera­ture tag attached to the gas valve train.

When first lighting the appliance, it will take
a few minutes for the line to purge itself of
air. Once purging is complete, the pilot and
burner will light and operate as indicated in
the instruction manual. Subsequent lightings
of the appliance will not require such purging.
Inspect the pilot flame (remove logs, if neces­sary, handling carefully).

SIT Millivolt
Gas Valve

Control
Compartment

Shown with control
compartment door
removed

Showing Piezo Igniter Location

Piezo Igniter

SIT Millivolt Gas Valve

Figure 23

16

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 (Figure 24).

Replace logs if removed for pilot inspection.

To light the burner; turn “ON” the remote wall
switch and rotate the gas valve control knob
counterclockwise to the “ON” position.

SIT MILLIVOLT PILOT ASSEMBLY

Proper Pilot Flame Appearance

Igniter Rod

Hood

Thermocouple

3/8"

(9 mm)

Pilot
Nozzels

Thermopile

Figure 24

Electronic Appliance Checkout

To light the burner, turn ‘ON’ the optional remote
wall switch and turn the gas control switch to
the “ON” position. Ensure the igniter lights the
pilot. The pilot flame should engulf the flame
rod as shown in Figure 25.

ELECTRONIC PILOT ASSEMBLY

Proper Pilot Flame Appearance

Proper Flame

Adjustment

Pilot
Nozzels

3/8" to 1/2"

(9 to 13 mm)

Ground

Electrode

Flame Rod

Hot Surface

Igniter

Figure 25

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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 volcanic stone, embers
and logs.
This appliance is not designed

•

to burn wood. Any attempt
to do so could cause irrepa­rable damage to the appliance
and prove hazardous to your
safety.
If logs are not installed

•

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.

Locate the packaged carton of logs (which were
located in the firebox). The decorative volcanic
stone and glowing embers were packaged
separately in plastic bags located in the control
area of the fireplace.

Install the logs per the instructions in the Care
and Operation Manual.

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.

Proper twig placement is critical to prevent sooting. Twigs should be

Do Not Place Glowing Embers Over Large Burner Ports

Glowing EmbersVermiculite

(light colored material)

Decorative Volcanic stone

(dark colored material)

Do Not Place Glowing Embers Over Large Burner Ports

Glowing EmbersVermiculite

(light colored material)

Decorative Volcanic stone

(dark colored material)

placed in the gaps between the flame peaks and should be positioned
so that at no time they impinge the flames.

Glowing Embers

1. Remove the appliance front door.

2. Remove the log set from the interior of the fireplace.

3. Remove the logs from their packaging. Handle logs carefully to prevent
breakage.

4. MPB-4035 & MPB-4540 Models - Remove the restraining strap from

the grate tines. Ensure the grate is fully inserted into the holes on the
firebox rear panel and over the indents on the firebox floor.

Glowing Embers, Vermiculite, Decorative Volcanic Stone And Log
Placement Instructions:

Step 1. Separate the Glowing Embers (Rockwool) into pieces about

the size of a quarter (see Figure 26). Keep the pieces fluffed up, not
matted.

MPB-3328 & MPB-3530 Models -

Distribute these pieces over the burner as shown in Figure 27. Do not use
more than is shown. The glowing embers should not be placed directly
over the large burner slots as shown in Figure 27.

MPB-4035 & MPB-4540 Models -

Place the center log (Log No. 1) on the burner as shown on Page 20.
Distribute the glowing ember pieces at the front of the burner as shown
in Figure 28. Do not use more than is shown. The glowing embers
should not be placed directly over the large burner slots as shown in

Figure 28.

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).

Separate into Quarter

Size (separate) Pieces

Bag of Glowing

Embers (rockwool)

Figure 26

Step 2. Mound up a portion of the vermiculite (light colored material) in
front of the burner and grate. Sprinkle the dark colored decorative volcanic
stone on top of the vermiculite in a pleasing pattern. For best results,
spread in a non-uniform manner while ensuring complete coverage of
the black sheetmetal surface.

See Figure 27 - MPB-3328 or MPB-3530, or Figure 28 - MPB-4035 or
MPB-4540 models.

Note: Do Not place vermiculite or decorative volcanic stone on top of
the gas burner where it will block the burner ports.

Step 3. Position the individual logs as described on Page 18 (MPB-3328),
Page 19 (MPB-3530) or Page 20 (MPB-4035 and MPB-4540).

Note: Your application may not require the use of all of the provided

vermiculite, or decorative volcanic stone. Replacement vermiculite,
volcanic stone and glowing embers is available (see below for ordering
information).

Cat. No. Model No. Description

88L53

H6319

80L42 FDVS Bag of Decorative Volcanic Stone

MPB-3328 and MPB-3530

Figure 27

REFERENCE

Firebox Accessories / Parts

FGE Bag of Glowing Embers

Vermiculite, Bag

Figure 28

MPB-4035 and MPB-4540

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

17

MPB-3328 LOG PLACEMENT

LOG SET

Catalog Number

1

3

2

* Item

1

2

3

4

5

6

* Item numbers above correspond to photos

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

4

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

5

6

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.

1

24M1501

Description (stamped #)

Log, Rear (39-12)

Log, Left (39-1)

Log, Right (39-2)

Log, Top Center (39-13)

Log, Top/Left (39-3)

Log, Top/Right (39-4)

4

3

2

5

6

18

Figure 29

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

MPB-3530 LOG PLACEMENT

LOG SET

1

3

2

* Item numbers above correspond to photos

Catalog Number

* Item

1

2

3

4

5

6

24M2201

Description (stamped #)

Log, Rear (39-5)

Log, Left (39-1)

Log, Right (39-2)

Log, Top Center (39-6)

Log, Top/Left (39-3)

Log, Top/Right (39-4)

4

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

5

6

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.

1

4

3

2

Figure 30

5

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

6

19

MPB-4035 & MPB-4540 LOG PLACEMENT

1

* Item

1

2

4

3

Position the individual logs as shown below. Logs should

2

3

4

5

6

* Item numbers above correspond to photos

LOG SET

Catalog Number

Description (stamped #)

Log, Center (39-8)

Log, Rear (138)

Log, Right (39-10)

Log, Left (39-9)

Log, Top/Left (39-11)

Log, Top/Right (39-11)

24M2501

be placed in the order shown. Position the center log on the
burner first, then place the glowing embers as shown in Fig-
ure 28. 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

5

6

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.

1

4

3

20

Figure 31

2

5

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

6

Step 10. INSTALLATION AND REMOVAL
OF GLASS DOOR

WARNING

• Do not attempt to substitute the

materials used on this door,
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 appli-

ance 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 replace is in
use.

Only doors certied with the appliance
shall be used.

Seules des portes certiées pour cet
appareil doivent être utilisées.

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

These appliances are designed to operate only
with the front glass enclosure panel properly
installed. Generally, the glass enclosure panel
should not be removed except to gain access
to the components within the firebox, and the
appliance may only be operated without the
front glass enclosure panel in place for very
brief periods of time during initial appliance
checkout and adjustment.

Removing Glass Enclosure Panels
(see Figure 32)

1. Remove the top louver assembly or radiant

panel.

2. Open the hinged drop-down control compart-

ment access panel.

3. Locate the latch at the top of the control

compartment and disengage it from the door
frame bottom Vee-flange, pulling down on
its handle to open it.

4. Swing the bottom of the door out and raise

it slightly to lift the top flange of the door
frame away from the appliance.

Top Flange on
Glass Door

Glass Door

Latch

Bottom Vee-ange

Glass Door

Note: When installing the glass door, ensure the
spacing on both sides are equal.

Figure 32 -

INSTALLING OR REMOVING GLASS DOOR

Firebox Floor

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.

Installing Glass Enclosure Panels
(see Figure 32)

1. Retrieve the glass door frame. Visually

inspect the gasket on the backside of the
panel. The gasket surface must be clean,
free of irregularities and seated firmly.

2. Position the door frame in front of the firebox

opening and engage the top flange over the
lip at the top of the firebox opening.

3. Swing the door down and back. Ensure the

gasket seats evenly as the door draws shut.
Engage the Vee-flange at the bottom of the
door with the latch and close the latch to
secure the door.

4. Reinstall the top louver assembly or radiant

panel.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

21

Step 11. BURNER ADJUSTMENTS

Flame Appearance and Sooting

Proper flame appearance is a flame which 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.
After 15 minutes of operation, if the flame is
blue, or if the flame is orange with evidence of
sooting (black tip), the air shutter opening may
need to be adjusted.

Burner Air Shutter Adjustment

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.

Note - The air shutter for the burner primary
air opening is factory-set. Do not adjust the
factory-set position. The factory-set position is
shown in Figure 33.

Setscrew - Factory located in the natural gas
position; relocate set screw for LP/propane
gas in the alternate position. See table for air
shutter openings for these setscrew locations.

Ref. Air shutter Patent:
U.S. Pat. 5,553,603

Venturi

If the air shutter opening is closed too far,
sooting may develop. Sooting is indicated
by black puffs developing at the tips of very
long orange flames. Sooting results in black
deposits forming on the logs, appliance inside
surfaces and on exterior surfaces adjacent to
the vent termination.

Sooting is caused by incomplete combustion
in the flames and lack of combustion air enter­ing the air shutter opening. To achieve a warm
yellowish-orange flame with an orange body
that does not soot, the shutter opening must be
adjusted between these two extremes.

Air Shutter Adjustment Guidelines

• Ifthereissmokeorsootpresent,rstcheck

the log set positioning to ensure that the
flames are not impinging on any of the logs.
If the log set is properly positioned and a
sooting condition still exists, then the air
shutter opening should be increased.

• Themoreoffsetsintheventsystem,thelarger

the air shutter opening will need to be.

• Anapplianceoperatedwiththeairshutter

opened too far, may have flames that appear
blue and transparent. These weak, blue and
transparent flames are termed anemic.

• Propanemodelsmayexhibitameswhich

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

CAUTIONS

• Soot will be produced if the

air shutter is closed too much.
Any damage due to carboning
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.

Air Shutter

Main Burner Factory Air Shutter

Opening Setting - Inches (millimeter)

Model Natural

Gas

MPB-3328 Fully Closed

MPB-3530 Fully Closed

MPB-4035 Fully Closed

MPB-4540 Fully Closed

Propane

Gas

3/16"

(4.76 mm)

3/16"

(4.76 mm)

3/16"

(4.76 mm)

3/16"

(4.76 mm)

Figure 33

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

22

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.

Figure 34

Burner Flame Appearance - Model MPB-3328

Step 12. VENT OPERATION TEST

After appliance installation, perform this vent
operation test to verify that proper venting
conditions exist:
1 - Place unit in its normally-operated condi-

tion, that is, with the glass enclosure panel
in place.

2 - Close all doors and windows in the room.

Turn on all exhaust fans in the house.

3 - Light the appliance.
4 - Wait 15 minutes.
5 - To check for venting action, start by hold-

ing a smoke producing device below the
glass enclosure panel. The smoke should
be drawn into the control compartment.
Continue the test by moving the smoke
producing device along the entire length
of below the glass door.

6 - If the smoke is not drawn into the control

compartment, turn off the appliance and
call a qualified service technician.

Manually-Reset Safety Limit Switch

This appliance is equipped with a manually­reset blocked flue safety limit switch. Refer to
Figure 37 for its location. If, during appliance
operation, the flame goes out (independently
of the burner on/off wall switch), it may be
due to the operation of this safety limit switch.
First allow the appliance to cool. Remove top
louver panel. Then reset the safety limit switch
by pushing the red reset button, located between
the wire terminals, on the back of the switch.
See Detail A of Figure 37 for location.

Figure 35

Figure 36

Burner Flame Appearance - Model MPB-3530

Burner Flame Appearance - Model MPB-4035 & MPB-4540

The appliance should then relight and remain
lit. Reinstall top louver panel. If the appliance
does not relight, turn off the appliance and call

for a qualified service technician.

To replace the blocked flue safety limit switch
refer to Figure 37 (Details B and C):

NOTE - This procedure should only be performed
by a qualified service technician.

Important - Turn electrical power off before
beginning this procedure.

1 - Lower the bottom control compartment

access panel. Remove the glass enclosure
panel: open the latch (located in the center
of the unit front opening, under the firebox
floor) securing the glass enclosure panel.
Remove the panel by tilting it outward at
the bottom and lifting it up. Set the door
aside protecting it from inadvertent dam­age. See Figure 32 on Page 21.

2 - Remove the lintel securing screws (3) and

then remove the lintel. One of the lintel
cabinet top holes is shown in Figure 37
(Detail B).

3 - Remove the scoop securing screws (3)

and then remove the scoop. See Figure
37 (Detail B).

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

23

Scoop

Scoop Securing Screws

Fire Box Top

Lintel Securing Screw
Hole in Cabinet Top

Fire Box Top

Limit

Limit/Bracket

Securing Screws

Lintel Securing-Screw

Hole in Cabinet Top

4 - Remove the safety switch bracket securing

Wire
Termianls

Back Of
Limit
Switch

Cabinet
Corner

Door
Frame

screws (2), and pull the switch/bracket
assembly, with low voltage wires attached,
through the side panel slot into the firebox.
See Figure 37, Detail C.

5 - Replace the switch.
6 - Reinstall the switch/bracket assembly.
7 - Reinstall the scoop and lintel.
8 - Reinstall the glass enclosure panel.
9 - Raise the bottom control compartment

access panel.

10 - The appliance should then relight and

remain lit. If this does not occur, check
unit for a blocked flue condition.

Step 13. HOOD INSTALLATION

All of these appliances must have a hood installed prior to operating on the side with a glass
enclosure panel.

On louvered face units, slide the hood into the slots on the lower edge of the cabinet top (see
Figure 38).

FINISHING REQUIREMENTS

Wall Details

Complete finished interior wall. To install the appliance facing flush with the finished wall,
position framework to accommodate the thickness of the finished wall (see Figure 38).

Combustible Wall
Framing

This area must remain clear
of combustible materials.

Detail A

Detail B

Combustible Finished
Wall Materials

Combustible Wall
Framing Spacer

3" (76 mm)

Minimum

Noncombustible Finished
Wall Materials

Hood must be installed as shown.

Figure 38

1" (25 mm)
Minimum

Header

Top of Appliance

Louvers

Top of Door Frame

Louver Face Models

24

Detail C

Blocked Flue Safety Limit Location,

Inside View of Firebox,

Top/Right Side Intersection

Figure 37

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Step 14. 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

Your fireplace has been furnished with safety instruc­tion labels that are to be affixed to the operation and
control point of the fireplace. A safety instruction
label should be affixed to the wall switch plate where
the fireplace is turned on and off (See Figure A) and
if used on the remote control handheld transmitter
(Figure B). The warnings should already have been
put in place when the fireplace initial set-up was
completed. If they are not affixed at these spots,
locate the multi-lingual adhesive labels provided with
these instructions and proceed as follows:

1. Locate the wall switch that controls the fireplace
(verify the switch operates the fireplace by turn­ing it on and off). Clean the wall switch plate
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). Choose
the language primarily spoken in the home.

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 B).
Choose the language primarily spoken in the
home.

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

Votre foyer a été livré avec des étiquettes de sécurité qui
doivent être collées à côté des dispositifs de contrôle
du foyer. Une étiquette de sécurité devrait être collée
sur la plaque de l’interrupteur contrôlant l’allumage du
foyer (voir Figure A) et, le cas échéant, sur le boîtier
de la télécommande (Figure B). Les mises en garde
auraient dû être collées au moment de l’installation
initiale du foyer. Si ce n’est pas le cas, prenez les
étiquettes adhésives multilingues fournies avec ces
instructions et procédez comme suit:

1. Repérez l’interrupteur 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 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). Choisissez la langue
qui est principalement parlée dans la résidence
du propriétaire.

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 B). Choisissez la langue qui est principale­ment parlée dans la résidence du propriétaire.

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

Su chimenea incluye etiquetas de instrucciones de
seguridad que deben colocarse en el punto de operación
y control de la chimenea. 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) y en el transmisor de control
remoto (Figura B) si se usa. Las advertencias ya deben
haberse colocado cuando se completó la instalación
inicial de la chimenea. Si no están colocadas en estos
lugares, encuentre las etiquetas adhesivas multilingües
proporcionadas con estas instrucciones y prosiga de
la siguiente manera:

1. Identifique el interruptor de pared que controla
la chimenea (verifique que el interruptor opera la
chimenea encendiéndola y apagándola). Limpie
bien la placa del interruptor 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). Seleccione el idioma que más se habla
en la casa.

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 B). Seleccione el
idioma que más se habla en la casa.

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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

DIAGRAMAS DE ETIQUETAS

DE SEGURIDAD

25

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/CSA­B149.1.

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

Propane to Natural Gas

Conversion Kits

Models Cat. No.
MPB-3328 19M43
MPB-3530 H2012
MPB-4035 H2014
MPB-4540 H2016

Millivolt SIT Systems

Natural Gas To Propane Gas

Conversion Kits

Models Cat. No.
MPB-3328 H2009
MPB-3530 H2011
MPB-4035 H2013
MPB-4540 H2015

Electronic HONEYWELL Systems

Natural Gas To Propane Gas

Conversion Kits

Models Cat. No.
MPB-3328 26M59
MPB-3530 26M60
MPB-4035 26M61
MPB-4540 26M62

Electronic HONEYWELL Systems

Propane Gas To Natural Gas

Conversion Kits

Models Cat. No.
MPB-3328 19M45
MPB-3530 26M64
MPB-4035 26M65
MPB-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.

Step 2. Remove the front glass door/frame. See

Figure 21. Access the control compartment.
See Figure 19.

Step 3. Carefully remove the logs. Exercise
care so as not to break the logs.

Step 4.

Remove the burner assembly with attached
venturi tube.

Step 5. Locate the screws securing the burner

assembly to the appliance. Remove the burner
assembly and retain the securing screws.

Step 6. Millivolt Appliances - SIT Systems
a. Refer to Figure 39 and the instructions

provided with the kit. Using a Torx T20 (with
1/4" shank and center hole), remove and discard
the three pressure regulator mounting screws.
Remove the pressure regulator, spring, poppet,
diaphragm and bushing. Discard all removed

components.

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.

26

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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.

Spring

Adjusting
Screw

Slotted
Cap

PSI

OFFION

CONTROL

IGNITE

Manifold
Pressure
Test Port

Inlet Pressure Test Port

SIT Millivolt Gas Valve

Pressure

Regulator

Remove
These
Components

Figure 39

b. Refer to Figure 40 and remove the pilot hood
assembly to access the hexed pilot orifice.
Remove and replace the orifice with the one
provided with the kit.

See Figure 42 and replace the pilot orifice as fol-
lows: Remove the igniter assembly retainer clip,
and carefully remove the igniter assembly.

Exercise extreme care to prevent damage to
or breakage of the igniter 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 igniter assembly, use
extreme care to prevent damage and break­age. Do not apply any leverage to the igniter
assembly while restoring the retainer clip to its
original position.

Burner Orifice Sizes

Elevation 0-4500 feet ( 0-1372 meters)

Models

MPB-3328 #47 (.0785") #1.2mm (.048")

MPB-3530 #44 (.086") #55 (.052")

MPB-4035 #37 (.104") 1/16"

MPB-4540 #36 (.1065") #52

Natural

Gas

drill size (inches)

Propane

Gas

drill size (inches)

(.0625")

(.0635")

Table 8

Pilot Hood

Pilot for SIT Millivolt

Gas Valve

Pilot
Orifice

Figure 40

Step 7. Electronic Appliances ­Honeywell Systems

See Figure 41 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.

Pilot Orifice

Flare Nut

Pilot Assembly

Igniter Assembly

Retaining Clip

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

Figure 42

All Models

Step 8. VERIFY THE PROPER ORIFICE SIZE
BEFORE INSTALLING IT.

Figure 43 illustrates the orifice.

Remove the orifice from the manifold, and
replace it with the one provided with the kit.

See Table 8 for orifice sizes for natural and
propane models.

Figure 43

Step 9. Reassemble all removed components
by reversing the procedures outlined in the
preceding steps. 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 10. Attach the conversion label provided
in the conversion kit to the rating plate on the
appliance.

Step 11. Turn on gas supply and test for gas
leaks.

Step 12. 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.

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

Figure 41

Use pipe joint compound or Teflon tape on all
pipe fittings before installing.

Note: ALWAYS use propane-resistant com­pounds in propane applications. NEVER use
pipe joint compounds on flare fittings.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

27

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

Printed in U.S.A. © 2005 Lennox Hearth Products

P/N 850033M Rev. G 01/2011

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