INSTALLATION
INSTRUCTIONS
B-VENT
MPB-33/35/40/45 SERIES
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
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 certifi ed kit is used.
WARNING: IF THE INFORMATION IN THIS
MANUAL IS NOT FOLLOWED EXACTLY, A FIRE
OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR LOSS
OF LIFE.
FOR YOUR SAFETY: Do not store or use gasoline
or other fl ammables or liquids in the vicinity of
this or any other appliance.
FOR YOUR SAFETY: What to do if you smell gas:
• DO NOT light any appliance.
• DO NOT touch any electrical switches.
• Do not use any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow your gas suppliers
instructions.
• If your gas supplier cannot be reached, call
the fi re department.
Installation and service must be performed by
a qualifi ed installer, service agency or the gas
supplier.
B-VENT GAS FIREPLACES
P/N 850,033M REV. B 05/2006
MODELS
Millivolt Models
MPB3328CNM
MPB3328CPM
MPB3530CNM
A French manual is available upon request. Order P/N 850,033CF
Ce manuel d’installation est disponible en francais, simplement en
faire la demande. Numéro de la pièce 850,033CF.
MPB3530CPM
MPB4035CNM
MPB4540CNM
AVERTISSEMENT: ASSUREZ-VOUS DE BIEN
SUIVRE LES INSTRUCTIONS DONNÉ DANS CETTE
NOTICE POUR RÉDUIRE AU MINIMUM LE RISQUE
D'INCENDIE OU POUR ÉVITER TOUT DOMMAGE
MATÉRIEL, TOUTE BLESSURE OU LA MORT.
POUR VOTRE SÉCURITÉ: Ne pas entreposer ni
utiliser d'essence ni d'autre vapeurs ou liquides
infl ammables dans le voisinage de cet appareil ou
de tout autre appareil.
POUR VOTRE SÉCURITÉ: Que faire si vous sentez
une odeur de gaz:
• Ne pas tenter d'allumer d'appareil.
• Ne touchez à aucun interrupteur. Ne pas vous
servir des téléphones se trouvant dans le batiment
où vous vous trouvez.
• Evacuez la piéce, le bâtiment ou la zone.
• 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 dos incendies.
Electronic Models
MPB3328CNE
MPB3530CNE
MPB4035CNE
MPB4540CNE
OTL Report No. 116-F-36-5
L'installation et service doit être exécuté par un
qualifi é installeur, agence de service ou le fournisseur de gaz.
TABLE OF CONTENTS
Packaging .........................................Page 2
Introduction ......................................Page 2
General Information ..........................Page 2
Location ............................................Page 4
Appliance Clearances ........................Page 4
Fireplace Specifi cations .....................Page 5
Gas Vent Rule ...................................Page 5
Framing Specifi cations ......................Page 6
Typical Installation Sequence ............Page 6
Installing The Fireplace .....................Page 7
Vent System Installation ...................Page 8
Field Wiring .......................................Page 8
Connecting Gas Line .........................Page 10
Outside Air Kit Installation .................Page 10
Installing Logs .................................Page 11
Appliance Operation ..........................Page 16
Millivolt Appliance Checkout .............Page 16
Electronic Appliance Checkout ..........Page 16
Installing Glass Door .........................Page 16
Burner Adjustments ..........................Page 17
Spillage Test ......................................Page 17
Manual Limit Switch .........................Page 17
Hood Installation ...............................Page 17
Finishing Requirements ....................Page 18
Cold Climate Insulation .....................Page 18
Installation Accessories ....................Page 18
Gas Conversion Kits .................. Page 19
This installation manual will help you obtain a
safe, effi cient, dependable installation for your
appliance and vent system.
Please read and understand these
instructions before beginning your
installation.
INTRODUCTION
These vented gas fi replaces are designed to
operate on either natrural or propane gas. They
must be installed with approved type-B, double
wall vent pipe systems routed to the outside
atmosphere.
The Millivolt appliances have a millivolt gas
control valve with piezo ignition system provides
safe, effi cient operation. 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 provides safe,
effi cient operation. External electrical power is
required to operate these units.
These appliances comply with National Safety
Standards and are tested and listed by OMNITest 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 fi replaces.
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, or the Natural Gas and Propane Installation Code, CSA B149.1 - latest edition.
The appliance, when installed, must be electrically grounded 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.
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.
Massachusetts -
Installation of these fi replaces are approved for
installation in the US state of Massachusetts if the
following additional requirements are met -
• Installation and repair must be done by a
plumber or gas fi tter licensed in the Commonwealth of Massachusetts.
• The fl 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 -
Installation of these fi replaces 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 1a and Page
18 for ordering information.
GENERAL INFORMATION
Note: Installation and repair should be performed by a qualifi ed service person. The
appliance should be inspected annually by a
qualifi ed professional service technician. More
frequent inspections and cleanings may be
required due to excessive lint from carpeting,
bedding material, etc.
It is imperative that the control compartment,
burners and circulating air passageways of the
appliance be kept clean.
S'assurer que le brùleur et le compartiment des
commandes sont propres. Voir les instructions
d'installation et d'utilisation qui accompagnent
l'apareil.
Provide adequate clearances around air openings and adequate accessibility clearance for
service and proper operation. Never obstruct
the front openings of the appliance.
PACKAGING LIST
The assembled vented gas fi replace is packaged with:
1 - One log set located in fi rebox area.
2 - One envelope containing the literature
package which consists of the homeowner's
manual, installation instructions, log set
supplement 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)
2
located in the control area.
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 qualifi ed installer, service
agency or the gas supplier.
NEW YORK CITY, NY AND MASSACHUSETTS REQUIREMENTS
These appliances are approved for installation
in the following USA locations listed in the
following:
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Vertical
Venting
Shown with Outside Air Kit
installed (model FOAK-4 or
FOAK-4LD)
Figure 1a
Offset
Outside Air
Kit can be
installed as
shown in
Figure 1a.
Venting
Figure 1b
WARNING
These fi replaces are vented decorative gas appliances. Do not burn
wood or other material in these
appliances.
These appliances are designed to operate on
natural or propane gas only.
Millivolt Models -
Millivolt models come standard with the manually-modulated gas valve; fl ame appearance
and heat output can be controlled at the gas
valve.
Electronic Models with
Fixed-Rate Gas Valve
Natural Gas Propane Gas
Model Input Rate
(BTU/HR)
MPB3328
MPB3530
MPB4035
MPB4540
17,500 17,500
20,000 20,000
30,000 28,000
31,000 29,000
Input Rate
(BTU/HR)
Table 2
All Models -
Maximum manifold pressure is 3.5 in. w.c. (0.87
kPa) for natural gas and 10 in. w.c. (2.49 kPa)
for LP/Propane gas.
Installations at Altitudes of 0 to 4500 ft.Units are tested and approved for elevations
of 0 to 4500 feet (0 to 1372 meters).
Installations at Altitudes above 4500 ft.For elevations above 4500 feet (1372 meters),
install the unit according to the regulations of
the local authorities having jurisdiction and,
in the USA, the latest edition of the National
Fuel Gas Code (ANSI Z223.1) or, in Canada,
the latest edition of the CAN1-B149.1 and
.2 codes.
Table 3 shows the units' gas orifi ce size for
the elevations indicated.
Burner Orifi ce Sizes
Elevation 0-4500 feet ( 0-1372 meters)
Models
MPB-3328 #47 (.0785") #1.2m (.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 3
Cet appareil peut être installé dans un maison
préfabriquée (É.-U. seulement) ou mobile
déjà installée à demeure si les réglements
locaux le permettent.
Cet appareil doit être utilisé uniquement
avec les types de gaz indiqués sur la plaque
signalétique. Ne pas l'utiliser avec d'autres
gaz sauf si un kit de conversion certifi é est
installé.
Millivolt appliances are fi tted with a SIT millivolt
gas control valve and have been tested with
and approved for use with this valve and are
listed accordingly.
Test gauge connections are provided on the front
of the millivolt gas control valves (identifi ed OUT
for the manifold side and IN for inlet pressure
side). A 1/8" NPT test gauge connection is
provided on the electronic gas control valve
adjacent to the outlet to the main burner.
Minimum inlet gas pressure to the appliance is
5.0 inches water column (1.24 kPa) for natural
gas and 11 inches water column (2.74 kPa) for
propane for the purpose of input adjustment.
Maximum inlet gas supply pressure to the appliance is 10.5 inches water column (2.61kPa)
for natural gas and 13.0 inches water column
(3.23 kPa) for propane.
The appliance must be isolated from the gas
supply piping system (by closing its individual
manual shut-off valve) during any pressure
testing of the gas supply piping system at
test pressures equal to or less than psig
(3.5) kPa).
The appliance and its individual shut-off valve
must be disconnected from the gas supply piping
system during any pressure testing of that system
at pressures in excess of psig (3.5 kPa).
These appliances must not be connected to a
chimney or fl ue serving a separate solid fuel
burning appliance.
Do not place clothing or other materials on or
near this appliance.
Input of millivolt models 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
Electronic Models -
Electronic models have a fi xed rate gas valve.
Input of electronic models is shown in Table 2:
Do not use these appliances if any part has
been under water. Immediately call a qualifi ed,
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 se servir de cet appareil s'il a été plongé
dans l'eau, complètement ou en partie. Appeler
un technicien qualifi é pour inspecter l'appareil
et remplacer toute partie du système de contrôle et toute commande qui ont été plongés
dans l'lau.
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 certifi ed kit is used.
WARNING
Failure to comply with the installation and operating instructions provided in this document will result in
an improperly installed and operating appliance, voiding its warranty.
Any change to this appliance and/or
its operating controls is dangerous.
Improper installation or use of this
appliance can cause serious injury
or death form fi re, burns, explosion
or carbon monoxide poisoning.
3
Carbon Monoxide Poisoning: Early signs
of carbon monoxide poisoning are similar
to the fl u with headaches, dizziness and/or
nausea. If you have these signs, obtain fresh
air immediately. Turn off the gas supply to the
appliance and have it serviced by a qualifi ed
professional, as it may not be operating
correctly.
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 design, or other
devices may impact the operation
of these appliances. Negative
pressures may result in poor fl ame
appearance, sooting, damage to
property and/or severe personal
injury. Do not operate these appliances in negatively pressured
environments.
WARNING
Children and adults should be
alerted to the hazards of high surface temperatures. Use caution
around the appliance to avoid burns
or clothing ignition. Young children
should be carefully supervised
when they are in the same room
as the appliance.
WARNING
Do not place clothing or other fl ammable materials on or near this
appliance.
AVERTISSEMENT
Surveiller les enfants. Garder les
vêtements, les meubles, l'essence
ou autres liquides à vapeur infl ammables lin de l'appareil.
WARNING
This appliance may only be fi tted
with doors certifi ed for use with
the appliance.
AVERTISSEMENT
Pour utilisation uniquement avec
les portes en verre certifi êes avec
l'appareil.
These appliances are equipped with an integral combustion air door and actuator arm.
Combustion air kits are optional and must be
installed before removing the securing screw
allowing the movement of the combustion air
actuator arm (see Step 8 on Page 10).
LOCATION
Figure 2
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 traffi c and away from furniture
and draperies. Consideration should be given
to traffi c ways, furniture, draperies, etc., due
to elevated surface temperatures. The location
should also be free of electrical, plumbing or
other heating/air conditioning ducting.
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.
These appliances may be used for bedroom
installations in the United States and are listed
accordingly. These units may not be installed
in bedrooms in Canada.
Typical Locations
APPLIANCE CLEARANCES
MINIMUM CLEARANCES
Inches (millimeters)
Back 1/2 (13)
Sides 1/2 (13)
Top Spacers 0 (0)
Floor 0 (0)
Bottom of Appliance
To Ceiling
Vent 1 (25.4)
SERVICE CLEARANCES
Front 3 ft. (0.9 m)
*Note: See Page 7, Step 3 for clearance requirements to the nailing fl ange
located at each side of the unit and any screw heads adjacent to it.
4
64 (1626)
Feet (meters)
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
0” Clearance
to Combustible
Side Wall
Bottom of Fireplace
Ceiling
**Note: See also Figure 37 on
Page 18 for an illustration of
mantel clearances.
64 in.
(1626 mm)
Figure 3
FIREPLACE SPECIFICATIONS
OUTSIDE AIR
SHUTTER
GAS INLET
(See Also
Right Side View)
ELECTRICAL
INLET
(Optional)
Figure 4
MPB3328
MPB3530
MPB4035
MPB4540
FRAMING
SPACERS
(Top and Sides
F
G
Flue Outlet For B-Vent Connection
and Rear)
H
J
Top View
ELECTRICAL INLET
Right Side View)
5-1/2
(140)
9-3/8
(238)
8-15/16
(227)
Left Side View
(See Also
7-3/8
(187)
(76)
E
A
3
1-3/8
(35)
D
C
Front View
3 (76)
B
.oNledoMABCDEFG
in.
mm
33-1/8
841 432
765 841
1730-1/8
27-1/2
699
33-1/8
.ni538/1-8/1-23912/1-92538/1-8/-61/7-258-3/4
mm298618384947298236613721222
21-1/2
546
24-7/8
621
NOTE - Hood shown
as positioned
in louvered
front model.
GAS INLET
(Either Side
and bottom)
OPTIONAL ELECTRICAL
INLET KNOCKOUT
REQUIRING A FIELD
PROVIDED JUNCTION
BOX (Either Side)
10-3/4
12-7/16
3 (76)
1³⁄₈
(35)
J
H
4
6-1/2
102273
165
.ni8/1-048/1-73422/1-438/1-048/7-92161/51-458-3/4
mm91013490166789101957973721
2
22
.ni8/1-048/1-73422/1-938/1-548/7-4361/7-7168-3/4
mm641134901630016411688344251222
ELECTRICAL INLET
2-3/4 x 2 (70 x 51) COVER
PLATE with KNOCKOUT)
K
1/2 (13)
5-1/2
(140)
9-3/8
(238)
2
(53)
Right Side View
K
13
330
16
406
16
406
16
406
Venting
GAS VENT RULE
Gas vent caps are not permitted 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
Table 4 and Figure 5, 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).
Gas Vent Rule
12
Roof Pitch is X/12
Minimum Height from Roof to
Lowest Discharge Opening
1" (25 mm)
Minimum
Figure 5
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Termination Heights For Vents
Above Flat Or Sloped Roofs
Ref. NFPA 54 / ANSI Z223.1, 7.6
Roof Pitch Feet Meters
X
Flat to 6/12 1' 0" 0.3
Over 7/12 to 9/12 2' 0" 0.6
Over 10/12 to 12/12 4' 0" 1.2
Over 13/12 to 16/12 6' 0" 1.8
Over 17/12 to 21/12 8' 0" 2.4
Table 4
Note: Venting terminals shall not be recessed
into a wall or siding.
5
FRAMING SPECIFICATIONS
Header
B
A
Fireplace Framing
Figure 6
Back Wall of Chase/Enclosure
Including Finishing Materials
if any
C
HH
Figure 7
Corner Installation
Figure 8
A
Inside Chase
Back Wall of Chase/Enclosure
Including Finishing Materials
K
D
C
A
E
Framing Face
(Unfinished Shown)
if any
Framing Face
(Unfinished Shown)
G
Rough
G
Rough
Back Wall of Chase/Enclosure
Including Finishing Materials
*Optional FOAK
Outside
Air Kit
J
Rough Framing Face
(Unfinished Shown)
C
A
Outside Chase
Figure 9
Note: All framing dimensions calculated for 1/2"
dry wall at the appliance face. If sheathing the
chase or fi nishing with other thickness materials, calculations will need to be made.
* Outside air kit - FOAK (without adapter)
TYPICAL INSTALLATION SEQUENCE
The typical sequence of installation follows,
however, each installation is unique resulting
in variations to those described.
See the Page numbers references in the following steps for detailed procedures.
Step 1. (Page 7) Construct the appliance framing.
Step 2. (Page 7) Route gas supply line to ap-
pliance location.
Step 3. (Page 7) Position the appliance within
the framing and secure with nailing brackets.
Step 4. (Page 8) Install the vent system and
F
exterior termination.
Step 5. (Page 8) Field Wiring
a. Millivolt Appliances – The operating control
switch is factory installed.
b. Electronic Appliances – Connect 120 Vac
electrical power to the appliance receptacle.
if any
G
Step 6. (Page 9) Install the optional blower.
Step 7. (Page 10) Make connection to gas
supply.
Step 8. (Page 10) Outside Air Kit Installation.
Step 9. (Page 11) Install the log set and decora-
tive volcanic stone.
Step 10. (Page 16) Checkout appliance opera-
tion.
Step 11. (Page 16) Install glass enclosure
panel.
Step 12. (Page 17) Burner adjustment.
Step 13. (Page 17) Spillage Test and Safety Limit
Switch Operation.
Step 14. (Page 17) Install the hood.
PRE-INSTALLATION NOTES
The fi replace may be installed directly on a
combustible fl oor or raised on a platform of
an appropriate height. Do not place fi replace on
carpeting, vinyl or other soft fl oor coverings. It
may, however, be placed on fl at wood, plywood,
particle board or other hard surfaces. Be sure
fi replace rests on a solid continuous fl oor or
platform with appropriate framing for support
and so that no cold air can enter the room from
under the fi replace.
The fi replace may be positioned and then the
framing built around it, or the framing may be
constructed and the fi replace positioned into
the opening.
Usually, no special fl oor support is needed for
the fi replace, however, to be certain:
1. Estimate the total weight of the fi replace
system and surround materials such as brick,
stone, etc., to be installed.
A
.oNledoM
tinU
eziS
33-1/8
MPB3328
MPB3530
MPB4035
MPB4540
6
Table 5
in.
mm
842
.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
45-1/8
mm64119411220101625768613486042017612911
1146
A
33-1/4
845
gnimarF
BCD E FGHJ K
eziS
546
886
11-1/4
286
12-3/4
324
14-11/16
373
17-3/16
437
33-1/4
21-1/2
845
24-7/8
632
29-7/8
759
34-7/8
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
48-1/2
1232
24-1/4
616
30-11/16
13
330
4
102
4-1/16
103
7-1/16
179
7-1/16
179
7-1/16
179
34-5/16
872
2. Measure the square footage of the fl oor space
to be occupied by the system, surrounds and
hearth extensions.
3. Note the fl oor construction, i.e. 2 x 6’s, 2 x
8’s or 2 x 10’s, single or double joists, type and
thickness of fl oor boards.
4. Use this information and consult your local
building code to determine if you need additional support.
If you plan to raise the fi replace and hearth
extension, build the platform assembly then
position fi replace and hearth extension on
top. Secure the platform to the fl oor to prevent
possible shifting.
INSTALLING THE FIREPLACE
Step 1. CONSTRUCT FRAMING
Frame appliance enclosure as illustrated in
Figures 6 through 9 on Page 6.
Note: The framed depth, 16 in. (406 mm) from
a framed wall, must always be measured from
a fi nished 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.
If the appliance is to be elevated above fl oor
level, a solid continuous platform must be
constructed.
The header may rest on the top metal spacers,
but must not be notched to fi t around them.
Consult all local codes.
Step 2. ROUTE GAS SUPPLY LINE
Route gas line (see Figure 10) using techniques
and materials prescribed by local and/or national
codes. It is recommended that a gas line of "
or greater diameter be used to allow full gas
volume to the fi replace. Undue pressure loss
will occur if the pipe is too small. 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.
When rigid pipe is used, an ANSI approved
manual shut-off valve and union must be
installed upstream of the fi replace.
Right Side Front
Corner of Fireplace
Framing
Also see
Figure 4
Ensure that a sediment trap is installed in the
existing gas line, if not, install a sediment trap
upstream to prevent moisture and contaminants
from passing through trap to the appliance controls and burners. Failure to do so could prevent
the appliance from operating reliably.
An external regulator must be used on all propane (L.P.G). heaters to reduce the supply tank
pressure to 13" w.c. (maximum). Any copper
tubing used to supply propane (L.P.G). from
the tank must be internally tinned.
IMPORTANT
Hold gas valve securely to prevent
movement when connecting to inlet
gas line.
WARNING
Connecting directly to an unregulated propane (L.P.G). tank may
cause an explosion.
All appliances are equipped with a gas fl ex line
and shutoff valve attached directly to the gas
control valve. Use of the gas fl ex line will aid
in the routing and attachment of the gas line
to the fi replace.
Step 3. POSITION THE APPLIANCE
Slide the fi replace into prepared framing or
position fi replace in its fi nal position and
frame later.
Refer to fi replace drawings and specifi cations
on Page 5 for framing dimensions and details.
Framing header may be positioned directly on
the fi replace top spacers.
IMPORTANT
Under no circumstances can the fi replace top spacers (refer to Figure 4)
be removed or modifi ed, nor may
you notch the header to fi t around or
be installed lower than the spacers.
The header may be in direct contact
with the top spacers but may not be
supported by them.
The fi replace should be secured to the side
framing members using the unit's nailing
fl anges - two at the top and bottom on each
side of the fi replace front. See Figure 11. Use
8d nails or their equivalent.
Side
Framing
Left Side Front Corner of Fireplace Shown
(Right Side Requirements the Same)
Unit Being Secured By Its Nailing Flanges
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.
To The Framing
Unit Nailing Flange
(No clearance to
combustible
framing is required)
Figure 11
Fireplace may be anchored to fl oor. Bend down
two anchor tabs (one on each side) located
at the base of the fi replace and secure to the
fl oor by nailing with 8d nails or equivalent
(Figure 12).
Anchor
Ta b
Note:
Some units only have one anchor tab on each side.
Figure 12
6 1/2"
(152 mm)
Figure 10 - ROUTE GAS LINE
3"
(76 mm)
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
7
Step 4. INSTALL THE VENT SYSTEM
& EXTERIOR TERMINATION
In the United States, vent installation must
conform with local building codes. In the absence of local codes, vents must be installed
in accordance with the current edition of the
National Fuel Gas Code (ANSI-Z223.1).
In Canada, vent installation must conform with
local building codes. In the absence of local
codes, vents must be installed in accordance
with the current edition of the National Stan-
dard of Canada CAN/CGA-B149.1 or B149.2
Installation Code.
MPB-3328, MPB-3530, MPB-4035 and MPB4540 series fi replaces 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)
A - Connect the proper size Type B-vent system
to the fi replace fl ue collar with three sheet
metal screws (No. 8 or larger). See Figure 13.
Then install the remainder of the Type B-vent
to the outside.
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
Securing
Screws
Flue Outlet
Collar
Figure 13
B - The following venting confi gurations may
be installed (see Figure 14):
1 - Vertical - Minimum overall height of the
vent system and appliance without an offset
must be 10' (2.54 m)
2 - With Offset -
a - Minimum overall height of the vent system
and appliance must be 12' (3.66 m) when an
offset up to 45 degrees from the vertical is
used. The lower part of the offset may start at
the fi replace fl ue collar.
8
Vertical
Installations
10 ft.
Minimum
Back View
Of Appliance
Figure 14
b - Minimum overall height of the vent system
and appliance must be 15' (4.57 m) when an
offset, more than 45 degrees but less than 60
degrees from the vertical, is used. The lower
part of the offset may start at the fi replace
fl ue collar.
Maximum overall height of the vent system
and appliance should not exceed 40 feet
(12.19 m).
Install the B-vent system in accordance with
the vent manufacturer's instructions.
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.
Step 5. FIELD WIRING
Refer to Section A for millivolt appliances and
Section B for electronic appliances. The gas
valve is set in place and pre-wired at the factory
on both models.
A. SIT Millivolt Wiring
(See Figure 15) –
1. Select any of the following optional con-
trols: appliance-mounted (rocker switch) or
wall-mounted 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 fi replace.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Offset
Installations
*12 ft. Min.
**15 ft. Min.
Back View
Of Appliance
*with an offset up to 45 degrees
** with an offset greater than 45
degrees and up to 60 degrees
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 15.
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.
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.
BK
HCTIW
S
T
IMI
L
BK
Thermopile
BK
AB
*OPTIONAL ON/OFF SWITCH,
WALL SWITCH, THERMOSTAT
OR REMOTE CONTROL RECEIVER
*TWIST WIRES “A” AND “B” TOGETHER TO OPERATE UNIT
SOLELY BY MANIPULATING THE GAS VALVE CONTROL KNOB;
OR CONNECT WIRES TO OPTIONAL ON/OFF SWITCH OR WALL
SWITCH OR THERMOSTAT OR REMOTE CONTROL RECEIVER
TO OPERATE UNIT.
Schematic Representation Only
WT
T
P
T
T
H
P
T
H
Figure 15
B. Electronic Wiring (See Figures17 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 fi eld-provided
junction box with receptacle may be installed at
the front of the control compartment on either
side of the cabinet. See Figure 16. It will be
held in place by a conduit fi tting and locknut
(fi eld-provided).
See Figure 4 on Page 5 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 16
(Left Side Shown)
1. Route a 3-wire 120Vac 60Hz 1ph power
supply to the appliance junction box.
2. If the factory-provided outlet/junction box at
the right rear of the fi replace is being used,
remove the outlet box from the junction box
by removing two screws.
3. Connect the power supply wires (includ-
ing the ground supply wire) as shown in
Figures17 or 18. (If the fi eld-provided
J-box/outlet box is being used, all of the
outlet box wiring must be fi eld-provided).
4. Locate and install a low voltage (24V)
wall-mounted switch or thermostat (both
fi eld-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 un-
switched 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 Figures17 or 18. It is integral
with the gas valve and should be set to the
ON position.
Step 6. 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 fi eld-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.
Electronic Wiring Diagram (Honeywell)
Showing the Blower Wiring for the Optional
FBK-100 and FBK-200 Kits
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.
**Leave the ON/OFF switch, which is integral
**ON/OFF Switch (Integral
with Gas Valve)
Gas Valve
BK
R
BL
OPT
BLOWER
Hot side of Outlet
W
OPTIONAL WALL SWITCH
OR OPTIONAL THERMOSTAT OR
OPTIONAL REMOTE RECEIVER
*Blower speed control switch is provided in FBK200 blower kit.
Figure 17
with the gas valve, in the ON position.
*OPTIONAL
ACCESSORY
G
Junction Box
B
G
BL
SWITCH
Red
pigtail
Black
pigtail
Transf.
120 V.
24 V
R
LIMIT SWITCH
BK
W
G
White Wire
to Opposite
Side
BK
PILOT
ASSEMBLY
IGNITER
Outlet Box
Green Ground
Screw
Break Off
Tab
W
BK BK
Factory Wired Field Wired
Schematic Representation Only
120
VAC.
Note: The tab connecting the receptacles of
the outlet box must be broken in FBK-100 and
FBK-200 blower kit applications.
IMPORTANT: Ground supply wire must be
connected to the green wire attached to the
outlet receptacle's green ground screw.
See Figures17 or 18. Failure to do so will
result in a potential safety hazard. The
appliance must be electrically grounded
in accordance with local codes or, in the
absence of local codes, the National Electrical Code, ANSI/NFPA 70-(latest edition). (In
Canada, the current CSA C22-1 Canadian
Electrical Code).
Electronic Wiring Diagram (Honeywell)
Showing the Blower Wiring for the Optional
FBK-250 Kits
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.
*Leave the ON/OFF switch, which is integral
*ON/OFF Switch (Integral
with Gas Valve)
Gas Valve
BK
R
BL
OPT
BLOWER
Hot side of Outlet
W
OPTIONAL ON/OFF SWITCH,
WALL SWITCH, THERMOSTAT
OR REMOTE CONTROL RECEIVER
with the gas valve, in the ON position.
Outlet Box Green
Ground Screw
PILOT
ASSEMBLY
IGNITER
Optional FBK-250
Module
W
B
G
BL
BK
Factory Wired Field Wired
Schematic Representation Only
BK
LIMIT SWITCH
G
BK
W
White Wire
To Opposite
Side
Junction Box
Transf.
120 V.
24 V
R
BK
120
VAC.
Figure 18
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
9
Step 7. CONNECTING GAS LINE
Make gas line connections. All codes require a
shut-off valve mounted in the supply line. Figure
19 illustrates two methods for connecting the
gas supply. The fl ex-line method is acceptable
in the U.S., however, Canadian requirements
vary depending on locality. Installation must be
in compliance with local codes.
These appliances are equipped with a gas fl ex
line for use (where permitted) in connecting the
unit to the gas line. A gas fl ex line is provided
to aid in attaching the B-Vent appliance to the
gas supply. The gas fl ex line can only be used
where local codes permit. See Figure 19 for
fl ex line description. The fl ex line is rated for
both natural and propane gas. A manual shut off
valve is also provided with the fl ex line.
The gas control valve is located in the lower
control compartment. To access the valve open
the lower control compartment door (see Fig-
ure 20). 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 fi tted with a1/2" x 3/8" (13 mm x
10 mm) NPT fi tting.
Secure all joints tightly using appropriate
tools and sealing compounds (ensure propane
resistant compounds are used in propane
applications).
Gas Flex Line Connector
Gas
Valve
³₈" Nipple
³₈" Union
³₈" Close Nipple
Figure 19 - GAS CONNECTION
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
Control
Valve
Figure 20
Turn on gas supply and test for gas leaks using
a soapy water solution. Never use an open
fl ame to check for leaks.
10
³₈" NPT x ³₈
Flare Fitting
³₈" Flex Tubing
Reducer
³₈" Shut-Off Valve
down.
Lower Control
Compartment
Door
OPENING CONTROL
COMPARTMENT DOOR
³₈" Flare
¹₂" x
Shut-Off Valve
¹₂
x ³₈ "
Gas
Stub
A. Mix a 50% dish soap, 50% water solution.
B. Light the appliance (refer to the lighting
instructions provided in the Homeowner's
Care and Operation Instructions).
C. Brush all joints and connections with the
soapy water solution to check for leaks. If
bubbles are formed, or gas odor is detected,
turn the gas control knob to the “OFF” position. Either tighten or refasten the leaking
connection and retest as described above.
D. When the gas lines are tested and leak free,
observe the individual tongues of fl ame on
the burner. Make sure all ports are open and
producing fl ame evenly across the burner. If
any ports are blocked, or partially blocked,
clean out the ports.
Step 8. OUTSIDE AIR KITS – Optional
outside make-up air kits, Model FOAK-4 or
FAOK-4LD, may be used with these appliances.
Refer to the installation instructions packaged
with the air kits for specifi c installation information. If used, the outside air kit must be installed
before the fi replace is framed and enclosed in
the fi nished wall.
Outside air drawn into the fi replace supplies
air to the fi re for combustion. Only one outside
air duct is necessary, if installed. See Figure
1 on Page 2 and Figure 4 on Page 5 for the
location of the unit's outside air inlet.
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
fl oor 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 NOT TO SCALE.
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 fi rebox. 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 fi replace 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 fi replace is in use
and completely closed when the fi replace is not
being used. Closing it when not in use will prevent
outside cold air from entering the dwelling.
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
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.
Step 9. INSTALLING LOGS, DECORATIVE VOLCANIC STONE AND GLOWING EMBERS
WARNING
Logs get very hot and will remain
hot up to one hour after gas supply
is turned off. Handle only when
logs are cool. Turn off all electricity
to the appliance before you install
grate and logs.
WARNING
This appliance is not meant to burn
wood. Any attempt to do so could
cause irreparable damage to your
appliance and prove hazardous to
your safety.
WARNING
Figure 22
Burner Flame Appearance - Model MPB-3328
The size and position on the log set
IS Critical to give your appliance a
safe, reliable and attractive fl ame
pattern. Any attempt to use a different log set in the fi replace will
void the Warranty and will result in
incomplete combustion, sooting,
and poor fl ame quality.
The packaged logs are located within the fi rebox.
The decorative volcanic stone and glowing
embers are packaged separately in plastic bags
located in the control area of the fi replace.
Install the logs per the instructions in the Homeowners 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 placed in the gaps between
the fl ame peaks and should be positioned so
that at no time they impinge the fl ames.
1. Remove the appliance front door.
2. Remove the log set from the interior of the
fi replace.
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 fi rebox rear panel and over the
indents on the fi rebox fl oor.
Figure 23
Figure 24
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Burner Flame Appearance - Model MPB-3530
Burner Flame Appearance - Model MPB-4035 & MPB-4540
11
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 25). Keep the pieces fl uffed up, not
matted.
MPB-3328 & MPB-3530 Models -
Distribute these pieces over the burner as shown in Figure 26. Do not use
more than is shown. The glowing embers should not be placed directly
over the large burner slots as shown in Figure 26.
MPB-4035 & MPB-4540 Models -
Place the center log (Log No. 1) on the burner as shown on Page 15.
Distribute the glowing ember pieces at the front of 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.
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).
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 26 - MPB-3328 or MPB-3530, or Figure 27 - 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.
Figure 25
(light colored material)
Do Not Place Glowing Embers Over Large Burner Ports
Figure 26
Glowing Embers
Separate into Quarter
Size (separate) Pieces
Bag of Glowing
Embers (rockwool)
Glowing EmbersVermiculite
Decorative Volcanic stone
(dark colored material)
MPB-3328 and MPB-3530
Step 3. Position the individual logs as described on Page 13 (MPB-3328),
Page 14 (MPB-3530) or Page 15 (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).
REFERENCE
Firebox Accessories / Parts
Cat. No. Model No. Description
88L53
H3696
80L42 FDVS
FGE Bag of Glowing Embers
(1 oz. rockwool)
Vermiculite, Bag (2 liters)
Bag of Decorative
Volcanic Stone
Table 6
12
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
42363
(light colored material)
Glowing EmbersVermiculite
Do Not Place Glowing Embers Over Large Burner Ports
MPB-4035 and MPB-4540
Figure 27
Decorative Volcanic stone
(dark colored material)
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 fi rebox 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 fi t 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
fl attened mounting faces in the bottom logs.
Proper log and twig placement is critical to encourage outstanding
fl ame 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
Figure 28
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
13
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 fi rebox 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 fi t 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
fl attened mounting faces in the bottom logs.
Proper log and twig placement is critical to encourage outstanding
fl ame appearance and prevent sooting.
1
4
3
14
2
Figure 29
5
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
6
MPB-4035 & MPB-4540 LOG PLACEMENT
1
* Item
1
2
4
3
* Item numbers above correspond to photos
Position the individual logs as shown below. Logs should
2
3
4
5
6
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 fi rst, then place the glowing embers as shown in Fig-
ure 27. Place the rear log, both the right and left, and then the
smaller left and right top logs. All logs that have notches to fi t
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 fl attened mounting faces in the bottom logs.
Proper log and twig placement is critical to encourage outstanding fl ame appearance and prevent sooting.
1
4
3
Figure 30
2
5
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
6
15
Step 10. CHECKING 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
Homeowner's Care and Operation Instructions.
For piezo igniter location see Figure 31
Note: Instructions are also found on the literature tag attached to the gas valve train.
When fi rst 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 fl ame (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 31
SIT Millivolt Appliance Checkout
The pilot fl ame should be steady, not lifting
or fl oating. Flame should be blue in color with
traces of orange at the outer edge.
The top 3/8" (10 mm) at the pilot generator
(thermopile) and the top 1/8" minimum (tip)
of the quick drop out thermocouple should be
engulfed in the pilot fl ame. The fl ame should
project 1" (25 mm) beyond the hood at all three
ports (Figure 32 ).
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 ance
Hood
Thermocouple
Pilot
Nozzels
Thermopile
Igniter Rod
Figure 32
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 fl ame should engulf the fl ame
rod as shown in Figure 33.
ELECTRONIC PILOT ASSEMBLY
Proper Pilot Flame Appearance
Proper Flame
Adjustment
Pilot
Nozzels
3/8" to 1/2"
(9 -13 mm)
Ground
Electrode
Flame Rod
Hot Surface
Igniter
Figure 33
Step 11. INSTALLING THE GLASS
DOOR
Retrieve the glass door. Visually inspect the
gasket on the backside of the frame. Gasket
surface must be clean, free of irregularities
and seated fi rmly.
Position the door in front of the fi rebox opening
with the bottom of the door held away from the
fi replace (Figure 34). Hook the top fl ange of the
door frame over the top of the fi rebox frame.
Let the bottom of the door frame swing gently
in towards the fi replace ensuring that the
gasket seats evenly as the door frame draws
shut. Fasten the latch located underneath the
fi rebox fl oor to the door's vee-fl ange. Close the
latch securely.
Top Flange on
Glass Door
Glass Door
Latch
Bottom Vee-fl ange
Glass Door
Firebox Floor
INSTALLING THE GLASS DOOR
Figure 34
WARNING
Handle this glass with extreme
care! The glass panel is susceptible
to damage – do not scratch while
handling or while re-installing the
glass door frame.
16
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Step 12. BURNER ADJUSTMENTS
w
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 35.
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.
Venturi
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
Figure 35
Step 13. SPILLAGE TEST
After appliance installation, perform this spillage 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 qualifi ed service technican.
Propane
Gas
3/16"
(4.76 mm)
3/16"
(4.76 mm)
3/16"
(4.76 mm)
3/16"
(4.76 mm)
Manually-Reset Safety Limit Switch
This appliance is equipped with a manuallyreset blocked fl ue safety limit switch. Refer to
Figure 36 for its location. If, during appliance
operation, the fl ame 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 36 for location.
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 qualifi ed service technician.
To replace the blocked fl ue safety limit switch
refer to Figure 36 (Details B and C):
NOTE - This procedure should only be performed
by a qualifi ed 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 fi rebox
fl oor) 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 34 on Page 16.
2 - Remove the lintel securing screws (3) and
then remove the lintel. One of the lintel
cabinet top holes is shown in Figure 36
(Detail B).
3 - Remove the scoop securing screws (3)
and then remove the scoop. See Figure
36 (Detail B).
4 - Remove the safety switch bracket securing
screws (2), and pull the switch/bracket
assembly, with low voltage wires attached,
through the side panel slot into the fi rebox.
See Figure 36 (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 fl ue condition.
Wire
Termianls
Cabinet
Corner
Back Of
Limit
Switch
Door
Frame
Detail A
Lintel Securing Screw
Fire Box Top
Hole in Cabinet Top
Scoop
Scoop Securing Screws
Detail B
Lintel Securing-Scre
Fire Box Top
Hole in Cabinet Top
Limit/Bracket
Securing Screws
Limit
Detail C
Blocked Flue Safety Limit Location - Inside
View of Firebox - Top/Right Side Intersection
Figure 36
Step 14. 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).
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
17
MANTEL CLEARANCES
Inches (mm)
14
12
(356)
(305)
10
(254)
8
6
(203)
(152)
NOTE - Hood shown as positioned
in louvered front model. The hood
position in the flush faced front model
is lower than shown.
*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.
Figure 37
FINISHING REQUIREMENTS
Wall Details
Complete fi nished interior wall. To install
the appliance facing fl ush with the fi nished
wall, position framework to accommodate
the thickness of the fi nished wall (see
Figure 38).
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.
Note: Combustible wall fi nish materials and/or
surround materials must not be allowed to
encroach the area defi ned 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:
they 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 37). 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.
12 (305) MANTEL
10 (254) MANTEL
8 (203) MANTEL
6 (152) MANTEL
4 (102) MANTEL
4
(102)
2 (51) MANTEL
TOP OF
APPLIANCE
COLD CLIMATE INSULATION
If you live in a cold climate, 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 fl oor on which
appliance rests, if fl oor is above ground level.
Combustible Wall
Framing
Combustible
Finished Wall
Materials
Combustible
Wall Framing
Spacer
3 in. Min.
(76 mm)
NonCombustible
Finished Wall
Materials
Hood must be installed as shown.
Louver Face Models
Figure 38
This Area Must Remain
Clear of Combustible
Materials
1" Min
(25 mm)
Top of Appliance
Louvers
Top of Door Frame
INSTALLATION ACCESSORIES
The following accessory items are available for
use in the installation of this appliance.
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)
(ref. Form # 750,008M)
Outside Air Kits Models FOAK-4 and FOAK4LD
Outside Air kits are available with duct (FOAK-4)
and without duct (FOAK-4LD) for use if outside
combustion air is required or desired. If model
FOAK-4LD is used it must be used in conjunction with locally purchased, non-combustible
Class 1 or Class 0 fl exible duct.
White Wall Switch Kit
Cat. No. Model No. Description
85L87 FWSK OFF/ON Wall Switch Kit
(ref. Form # 750,028M & 750,029M)
OFF/ON Wall Switch Kit
The OFF/ON wall switch kit may be used to control
the operation of the fi replace burner. Install the
OFF/ON wall switch in a convenient location near
the fi replace.
18
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
GAS CONVERSION KITS
WARNING
This conversion kit shall be installed by a qualifi ed
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 instructions is not followed
exactly, a fi re, explosion or production of carbon
monoxide may result causing property damage,
personal injury or loss of life. The installation is
not proper and complete until the operation of the
converted appliance is checked as specifi ed in the
owner instructions supplied with the kit.
The qualifi ed service agency performing this installation assumes responsibility for this 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 CAN1-B149.1
AND .2 INSTALLATION CODE.
LA CONVERSION DEVRA ÊTRE EFFECTUÉE
CONFORMÉMENT AUX RECOMMANDATIONS DES AUTORITÉS PROVINCIALES
AYANT JURIDICTION ET CONFORMÉMENT
AUX EXIGENCES DU CODE D'INSTALLATION
CAN1-B149.1 ET.2.
Gas conversion kits are available to adapt the
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 affi xed to
ensure safe operation.
Kit part numbers are listed here and the following
steps detail the conversion procedure.
Step 1. Turn off the gas supply to the appliance.
Remove the front glass door/frame from the
appliance. Access the control compartment.
Step 2. Carefully remove the logs. Exercise
care so as not to break the logs.
Step 3. Locate the screws securing the burner
assembly to the appliance. Remove the burner
assembly and retain the securing screws.
Step 4. Millivolt Appliances - SIT Systems
a. Refer to Figure 39 and the instructions pro-
vided with the kit. Using a Torx T20, remove and
discard the three pressure regulator mounting
screws. Remove the pressure regulator, spring,
poppet, diaphragm and bushing. Discard all
removed components. Ensure the rubber
gasket installed on the back of the replacement
pressure regulator is properly positioned and
install the new pressure regulator using the new
screws supplied with the kit. Tighten screws
to 25 In. lb. torque.
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
Millivolt SIT Systems
Propane to Natural Gas
Conversion Kits
Models Cat. No.
MPB-3328 19M43
MPB-3530 H2012
MPB-4035 H2014
MPB-4540 H2016
AVERTISSEMENT
Cet Équipement de conversion sera installÉ par
une agence qualifi Ée de service conformÉment aux
instructions du fabricant et toutes exigences et codes
applicables de l’autorisÉs avoir la juridiction. Si
l’information dans cette Instruction n’est pas suivie
exactement, un feu, explosion ou production de
protoxyde de carbone peut rÉsulter le dommages
causer de propriÉtÉ, perte ou blessure personnelle de
vie. L’agence qualifi Ée de service est esponsable de
l’installation propre de cet Équipment. L’installation
n’est pas propre et complÉte jusqu’à l’opÉration de
l’appareil converti est chÉque suivant les critères
Établis dans les instructions de propriÉtaire provisionnÉes avec l’Équipement.
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
SIT Millivolt Gas Valve
Pressure
Regulator
Remove
These
Components
Figure 39
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
19
b. Attach manometer to the manifold side
pressure test fi tting 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.
c. Refer to Figure 40 and remove the pilot hood
assembly to access the hexed pilot orifi ce.
Remove and replace the orifi ce with the one
provided with the kit.
Pilot Hood
Pilot for SIT Millivolt
Gas Valve
Pilot
Orifi ce
Figure 40
Step 5. 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.
Before installing the cap, attach manometer
to the manifold side pressure test fi tting and
adjust screw until pressure reads 3.5 inches
water column (0.87 kPa) for natural gas,
and 10.0 inches water column (2.49 kPa) for
propane gas.
CONTROL
IG
N
IT
E
Manifold
Pressure
Test Port
Slotted
Cap
OFFION
Inlet Pressure Test Port
I
PS
Adjusting
Screw
Spring
Figure 41
See Figure 42 and replace the pilot orifi ce 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 fl are nut at
the end of the pilot gas line to free the pilot
assembly from the gas line. Remove the pilot
orifi ce 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.
Pilot Orifi ce
Pilot Assembly
Igniter Assembly
All Models
Step 6. Remove the orifi ce from the manifold
and replace it with the one provided with the
kit. See Table 7 for orifi ce sizes for natural
and propane models. Figure 43 illustrates the
orifi ce.
Burner Orifi ce 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 7
Figure 43
Step 7. Reassemble all removed components
by reversing the procedures outlined in the
preceding steps. Use pipe joint compound or
Tefl on tape on all pipe fi ttings before installing
(ensure propane resistant compounds are used
in propane applications, do not use pipe joint
compounds on fl are fi ttings).
Step 9. Attach the conversion label provided
in the conversion kit to the rating plate on the
appliance.
Note: If the Igniter is damaged, a replacement kit is available - order Catalog
Number 87L54.
Figure 42
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
The manufacturer reserves the right to make changes at any time, without notice, in design,
materials, specifi cations, prices and also to discontinue colors, styles and products.
Consult your local distributor for fi replace code information.
Printed in U.S.A. © 2005 by LENNOX HEARTH PRODUCTS
P/N 850,033M REV. B 05/2006
20
Flare Nut
Retaining Clip
Step 10. Turn on gas supply and test for gas
leaks.
1110 West Taft Avenue • Orange, CA 92865
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