Monessen Hearth M400BFC User Manual
M400BFC
Balanced Flue (Closed Combustion)
Heat-Circulating Fireplace
Homeowner’s Installation and
Operating Manual
For use in the U.S. / Canada
Underwriter’s Laboratories
Report No. MH7603
DO NOT DISCARD THIS MANUAL: Retain for future use.
87D1505 12/09 Rev. 3
M400BFC Balanced Flue Heat-Circulating Fireplace
Table of Contents
Safety Information ......................................................................................3
Specifications and Framing .......................................................................4
Parts Identification ....................................................................................6
Chimney Requirements ............................................................................7
Planning Information .................................................................................. 8
Installation .................................................................................................9
Replacement Parts ..................................................................................19
Accessories .............................................................................................21
Warranty...................................................................................................23
M400BFC
Listed
UL127 / ULC-S610
Standard for Factory Built Fireplaces
2
87D1505
M400BFC Balanced Flue Heat-Circulating Fireplace
Safety Information
Please Read This Manual Before Installing and Using Fireplace
IMPORTANT: Read all instructions and warnings carefully before starting installation. Failure to follow these instruc-
tions may result in a possible fire hazard and will void the warranty.
Description
The M400BFC fireplace is a solid fuel, woodburning
fireplace. The M400BFC is a balanced flue (closed
combustion) heat-circulating fireplace which receives
outside combustion air through the chimney system.
The M400BFC is a decorative fireplace which provides
efficient supplemental heat compared to other wood
burning fireplaces. It should not be used as a primary
source of heat.
CAUTION: Overloading the firebox with wood may result in overfiring and damage to refractory components,
the grate and doors.
Precautions
Any such action may possibly cause a fire hazard.
Consult local building codes to ensure that you are in
compliance before installing the fireplace.
This fireplace and chimney system must be vented to
the out-of-doors.
Do not obstruct or modify air inlets/outlets in any
manner.
Do not install combustible materials on any of the
black fireplace surround.
Burn only solid wood fuel or gas logs.
The M400BFC is intended for operation only with
the doors closed.
Do not install a solid fuel burning insert or other
products not specified for use with this fireplace.
MHSC fireplaces and component parts have been
thoroughly tested and will operate safely when installed
in accordance with instructions provided in this manual.
Carefully read and understand all instructions before
beginning installation.
If you notice any damage to fireplace or component
parts, immediately report damage to your Monessen
dealer.
Only use MHSC components or the warranty will be
voided and a fire hazard may be created.
MHSC warranty will be voided by and MHSC disclaims
any responsibility for the following actions:
• Installation by any other than a qualified
installer, preferably NFI or WETT (Canada)
certified.
• Installation of any damaged fireplace or chim-
ney component;
• Modification of fireplace, chimney assembly
or any component parts thereof; (except for
chase flashings as detailed in MHSC Chimney
Top installation instructions).
• Installation other than as instructed by MHSC;
or
• Installation and/or use of any component part
not manufactured or approved by MHSC in
combination or assembly with a MHSC fireplace system, notwithstanding any independent testing laboratory or other third party
approval of such component parts or accessory.
Proposition 65 Warning: Fuels used in gas, wood-
burning or oil fired appliances, and the products of
combustion of such fuels, contain chemicals known
to the State of California to cause cancer, birth defects and other reproductive harm.
California Health & Safety Code Sec. 25249.6
WARNING: Check with your electronics manufacturer before installing a television or other electronic device above this fireplace.
Drafts
The fireplace should not be located in areas that create
drafts (ie: frequently opened doors and central heating
air inlets/outlets) that hamper the normal flow of air into
the fire.
Gas Logs
If you plan to install a gas log, the gas line should be
installed before framing the fireplace. The gas line must
be installed by a certified gas line installer.
87D1505
3
M400BFC Balanced Flue Heat-Circulating Fireplace
6
" (16mm)
56O" (13mm)
56O"
326"
(829mm)
41(6" (1064mm)
6"
(16mm)
56QE"
(49mm)
" (914mm)
"
(533mm)
56QE" (176mm)
56QE" (179mm)
Recessed
Nailing
Flange
1356O" Dia.
(343mm)
Rough Opening Width 43"
Rough
Opening
Height
Rough
Opening
Depth
Gas Line
Access
5156QE" (1297mm)
5156QE"
(1297mm)
6QE
" (1834mm)
6M"
(197mm)
23"
(584mm)
"
(610mm)
6QE"
(624mm)
3956M"
(997mm)
556QE"
(246mm)
35"
(889mm)
"
(279mm)
Gas Line
Access
56O"
(902mm)
36"
(914mm)
(1092mm)
11" Dia.
(179mm)
8" Dia.
(203mm)
56
" (918mm)
A
B
C
M400BFC Balanced Flue Heat-Circulating Fireplace
Fig. 1 M400BFC specifications and framing.
Fig. 1a Hearth dimensions.
Front Width Back Width Depth
A B C
M400BFC 32Z\x" 20M\zn" 17C\v"
(826 mm) (519 mm) (451 mm)
FP1531
4
87D1505
Batt Insulation
(Cut out around
firestop)
Firestop
Ceiling Level
M400BFC Balanced Flue Heat-Circulating Fireplace
Termination Cap
Storm Collar
Pan Flashing
Draftstop
Gas Line Access Hole
(Each Side)
Top Grille and Air Outlet
Standoff
Trim Ledge
Standoff
Surround
Glass Door
Romex Pigtail
Gas Line Access Knockout (Each Side)
Air Inlet
Basket Grate
Bottom Grille
Metal Safety Strip(s)
Shown not inplace
(1,2 or 3 pieces)
Nailing Flange
Fig. 2 Fireplace and chase parts identification.
87D1505
FP554c
5
M400BFC Balanced Flue Heat-Circulating Fireplace
D
Rise
B
G
H
B
Offset
C
E
6 FT.
G
H
A
Hearth
Floor
Chimney
Section
CHIMNEY FLUE EXIT
Elbow
TCS8A
Support
Example 1 Example 2 Example 3
Offset
Rise
Chimney Requirements - Offset Installations
Notes: G + H cannot exceed 20 feet.
Air Space Clearances: = 2” Min. to Combustibles
Illustration Key
The following safety rules apply to
offset installations (letters correspond
with illustration above):
A. Height of the chimney is measured
from the hearth to the chimney exit.
M400BFC
Maximum: 50’0”
Minimum:
Without Elbows 14’6”
With 2 Elbows* 14’6”
With 4 Elbows* 21’0”
B. Do not use more than 4 elbows per
chimney.
Attach the straps of the return (top)
elbow to a structural framing member.
The offset (first) elbow of any pair does
not have straps.
Offset
IWF282
Rise
30°
Return
Elbow
30°
Offset
Elbow
30°
Return
Elbow
30°
Offset
Elbow
FP269
C. The chimney cannot be more than 30°
(45° in Canada) from the vertical plane in
any installation*.
D. The maximum length of the angled run
of the total chimney system is 20 feet. (G
plus H cannot exceed 20 feet.)
E. A chimney support (Model TCS8A)
is required every 6 feet of angled run of
chimney. Chimney supports are required
for every 30 feet and 60 feet of vertical
chimney height above the hearth.
Determine the offset distance of your
chimney arrangement from the centerline
of the fireplace to the centerline of the
chimney where it is to pass through the
first ceiling.
NOTE: This offset distance may not be
your full offset distance. See Examples 2
and 3.
30˚ Elbow Offsets
1’
0 0 0 0 0 3” 11”
1 0 0 0 0 8Z\v" 20"
0 1 0 0 0 11Z\v" 25Z\v"
2 0 0 0 0 13Z\x" 29Z\v"
1 1 0 0 0 16Z\x" 34Z\v"
0 0 1 0 0 20Z\v" 40C\v"
2 1 0 0 0 21C\v" 43Z\x"
0 0 0 1 0 26Z\v" 51Z\v"
0 1 1 0 0 28Z\x" 55Z\v"
1 0 0 1 0 31Z\x" 60Z\v”
0 1 0 1 0 34Z\x" 65Z\x"
0 0 2 0 0 37Z\x" 70C\v"
1 1 0 1 1 41Z\x" 77C\v"
0 0 1 1 1 45" 83C\v"
0 1 2 0 1 47Z\v" 87Z\x"
0 0 0 2 1 51" 94"
0 1 1 1 1 53Z\v" 98"
0 0 3 0 1 56Z\v" 103Z\v"
0 1 0 2 1 59Z\v" 108Z\x"
0 0 2 1 1 62Z\v" 113Z\x"
0 1 3 0 1 64Z\x" 117Z\x"
0 0 1 2 1 68Z\v" 124"
0 1 2 1 1 70Z\x" 128"
0 0 0 3 1 74Z\v" 134Z\x"
0 1 1 2 2 78" 140C\v"
0 0 3 1 2 81" 146"
0 1 0 3 2 84" 151Z\v"
0 0 2 2 2 87" 156Z\x"
0 1 3 1 2 89Z\v" 160Z\v"
0 0 1 3 2 93" 166C\v"
0 1 2 2 2 95Z\v" 170C\v"
0 0 0 4 2 99Z\v" 177C\v"
0 1 1 3 2 101Z\v" 181C\v"
0 0 3 2 2 104Z\v" 186Z\v"
0 1 0 4 2 107Z\v" 191Z\x"
0 0 2 3 2 110Z\v" 196C\v"
0 1 3 2 3 114" 203Z\v"
0 0 1 4 3 117C\v" 209C\v"
0 1 2 3 3 120" 213Z\x"
0 0 0 5 3 123C\v" 220"
1¹⁄₂'
3’ 4’
Chimney
Support
Fig. 3 Chimney system requirements.
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87D1505
M400BFC Balanced Flue Heat-Circulating Fireplace
L
1
L
1
L
T
TOTAL
LENGTH
(LT)
INSTALLED
LENGTH
(L1)
56O
"
56O
"
56O
"
56O
"
56O
"
56O
"
56O
"
56O
"
TRIPLE
WALL
81
818
83
84
2’ Min.
2’ Min.
3’
Min.
0 To 10’
3’
Min.
0 To 10’
Reference
Point
Planning Information
Preplanning an installation is very important to ensure
safety and to save time and money. An installer must
predetermine where a fireplace will be set and how the
chimney system will be run.
Mounting the Fireplace
A fireplace may only be mounted on the following surfaces:
1. A flat combustible surface.
2. A raised wooden platform.
3. A concrete block or other solid object placed beneath each of the four (4) corners of the fireplace.
The fireplace must be spaced 1” (25 mm) from a combustible back wall and 1/2” (13 mm) from a combustible
side wall or support. (Page 13, Fig. 17)
Planning the Chimney Run
The Ten Foot Rule
Major U.S. building codes specify a minimum chimney
height above the roof top. The “Ten Foot Rule” is a fire
safety rule and not a draft rule. To ensure proper draft,
it is recommended that you always meet or exceed the
“Ten Foot Rule,” especially when installing a termination
on a high pitch roof. (Fig. 5)
The key points of the “Ten Foot Rule” are:
1. If the horizontal distance from the chimney to the
peak of the roof is 10’ (3 m) or less, the top of the
chimney must be at least 2’ (610 mm) above the
peak of the roof, but never less than 3’ (914 mm)
in height above the highest point where it passes
through the roof.
2. If a horizontal distance from the chimney to the peak
of the roof is more than 10’ (3 m), a chimney height
reference point is established on the surface of the
roof a distance of 10’ (3 m) from the chimney in a
horizontal plane. The top of the chimney must be
at least 2’ (610 mm) above the reference point, but
never less than 3’ (914 mm) in height above the highest point where it passes through the roof.
Fig. 4 Installed lengths of chimney sections.
Determine how the chimney will be run, length of run
and chimney components required to complete the
job. (Fig. 4) Never install a chimney below minimum
heights.
In planning a chimney system, it is important to know:
1. The height of a chimney is measured from the
hearth to the exit point on the termination.
2. A chimney cannot be offset more than 30° from a
vertical plane.
3. A chimney may run straight up or it may be necessary to offset it to avoid obstructions.
4. The maximum length of an angled run (total chimney
system) is 20’ (6 m).
5. No more than 2 offsets (4 total 30° elbows in U.S./or
2 total 45° elbows in Canada) per fireplace may be
used.
6. A guy wire stabilizer is required for chimneys extending more than 6’ (1.8 m) above a roof line.
87D1505
FP288a
AC246
Fig. 5 Ten Foot Rule illustration.
7
M400BFC Balanced Flue Heat-Circulating Fireplace
Chimney Supports
The chimney system is supported by the fireplace for
vertical chimney heights less than 30’ (9 m) above the
hearth. Chimney supports are required if the vertical
height exceeds 30’ (9 m). Locate chimney supports
at ceiling holes or other structural framing at 30’ (9 m)
heights. Spacing between chimney supports must
not exceed 30’ (9 m). Use Chimney Support Model
TCS8A. (NOTE: The TCS8A cannot be mounted
directly to the fireplace.) Support provided by elbow
straps fulfills the support requirement only if they are
spaced as previously described. (A chimney support is
2Z\x" (64 mm) long when installed.)
Angled chimney runs require a support every 6’ 1.8 m)
in addition to the elbow straps. Chimney supports are
used for this function. (Fig. 6)
Chimney Support Strap
TCS8A
Fig. 6 Chimney support installation.
FP284a
Installation
Insulating Fireplace Enclosure
for Cold Climates
If you live in a cold climate, it is not required but
highly recommended that you insulate fireplace
enclosure to eliminate cold air penetration as much
as possible.
Insulate base of fireplace with a noncombustible
insulation rated for a minimum of 300°F. Insulating
is very important for outside wall installations over
a concrete slab. If fireplace is installed on a platform,
insulation should be placed on top of the platform
before fireplace is set. (Fig. 7)
When a fireplace is installed in a chase or on a
outside wall, enclosure should be treated like any
outside wall in a home. Insulation should be installed
on the inside wall as well as the outside wall(s). In
a chase, it is also a good idea to install a firestop at
the first ceiling level above the fireplace and enclose
the chase with sheeting material. Insulation may
then be installed above sheeting material to assure
the space around the fireplace is totally protected.
(Fig. 2)
When installing the chimney, DO NOT caulk between outer pipe and firestop. It is vital that some air
be allowed to flow through this very thin gap.
CAUTION: When installing a fireplace in an insulated enclosure, be sure all required air spaces
are maintained. (Page 13, Fig. 17)
Chase Installation
A chase is a vertical box-like structure which encloses
the fireplace and/or chimney. Chases are typically built
on the outside of the house with fireplace opening cut
into the outer wall of a room. (Page 4, Fig. 2)
If you need help in determining fireplace location or
how the chimney system should be run, contact your
Monessen dealer for assistance.
8
87D1505
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