Balanced Flue (Closed Combustion) Heat

Balanced Flue (Closed Combustion) Heat
BFC
Balanced Flue
(Closed Combustion)
Heat-Circulating Fireplace
Model:
BFC36
Homeowner’s Installation and
Operating Manual
647
BFC cover
8/18/00 djt
For use in the U.S. / Canada
Underwriter’s Laboratories
Report No. MH7603
DO NOT DISCARD THIS MANUAL: Retain for future use.
7412647 1/11 Rev. 19
BFC36 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
BFC36
Listed
UL127 / ULC-S610
Standard for Factory Built Fireplaces
2
7412647
BFC36 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 instructions may result in a possible fire hazard and will void the warranty.
Consult local building codes to ensure that you are in
Description
compliance before installing the fireplace.
The BFC36 fireplace is a solid fuel, woodburning fireThis fireplace and chimney system must be vented to
place. The BFC36 is a balanced flue (closed combusthe out-of-doors.
tion) heat-circulating fireplace which receives outside
Do not obstruct or modify air inlets/outlets in any
combustion air through the chimney system. This
manner.
unique system results in much higher efficiency since
Do not install combustible materials on any of the
valuable room air is not used for combustion.
black fireplace surround.
The BFC36 is a decorative fireplace which provides
Burn only solid wood fuel or gas logs.
efficient supplemental heat compared to other wood
The BFC36 is intended for operation only with the
burning fireplaces. It should not be used as a primary
doors closed.
source of heat.
Do not install a solid fuel burning insert or other
CAUTION: Overloading the firebox with wood may reproducts not specified for use with this fireplace.
sult in overfiring and damage to refractory components,
the grate and doors.
Precautions
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 MHSC 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 chimney 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, woodburning 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.
Any such action may possibly cause a fire hazard.
7412647
3
BFC36 Balanced Flue Heat-Circulating Fireplace
BFC36 Balanced Flue Heat-Circulating Fireplace
6QE"
(624mm)
Rough
6M"
Opening
(197mm)
Depth
5156QE" (1297mm)
56O" (13mm)
56O"
( 1 6 "
83 (1
4m 6m
m m)
)
Rough
Opening
Height
6Q
E"
5 6
"(
5156QE"
(1297mm)
91
8m
m
)
"
(610mm)
23"
(584mm)
Rough Opening Width 43"
(1092mm)
56QE" (179mm)
56O"
(902mm)
35"
(889mm)
Gas Line
Access
3956M"
(997mm)
"
556QE"
(246mm) (279mm)
1356O" Dia.
(343mm)
11" Dia.
(179mm)
8" Dia.
(203mm)
6" Recessed
(16mm)Nailing
Flange
326"
(829mm)
"
(533mm)
36"
(914mm)
" (914mm)
41(6" (1064mm)
56QE"
(49mm)
Gas Line
Access
56QE" (176mm)
Fig. 1 BFC36 specifications and framing.
647
BFC36 specs
Width
Back
8/18/00 djt
B
BFC36
Front
A
32Z\x"
(826 mm)
Width
B
20M\zn"
(519 mm)
Depth
C
17C\v"
(451 mm)
C
A
FP1531
Fig. 1a Hearth dimensions.
FP1531
hearth dimensions
9/04 djt
4
7412647
BFC36 Balanced Flue Heat-Circulating Fireplace
Termination Cap
Storm Collar
Pan Flashing
Batt Insulation
(Cut out around
firestop)
Draftstop
Firestop
Ceiling Level
Standoff
Trim Ledge
Standoff
Surround
Glass Door
Gas Line Access Hole
(Each Side)
Romex Pigtail
Gas Line Access Knockout (Each Side)
Air Inlet
Basket Grate
Bottom Grille
Top Grille and Air Outlet
Metal Safety Strip(s)
Shown not inplace
(1,2 or 3 pieces)
Nailing Flange
FP554c
Fig. 2 Fireplace and chase parts identification.
7412647
FP554a
BFC
Fireplace and chase parts identification
circulating model
8/21/00 djt
5
BFC36 Balanced Flue Heat-Circulating Fireplace
Chimney Requirements - Offset Installations
Offset
CHIMNEY FLUE EXIT
Rise
Chimney
Section
B
D
E
6 FT.
C
G
30°
Offset
Elbow
Rise
Offset
H
30°
Return
Elbow
30°
Offset
Elbow
B
FP282
30˚ Elbow Offsets
MBUF
5/26/96
G
TCS8A
Support
H
Hearth
Floor
Example 1
Example 2
Notes: G + H cannot exceed 20 feet.
Air Space Clearances: = 2” Min. to Combustibles
Illustration Key
Example 3
FP269
FP269
The following safety rules apply to
offset installations (letters correspond
with illustration above):
C. The chimney cannot be more than MBUF
30˚
(45˚ in Canada) from the vertical plane5/16/96
in
rev. 5/25
any installation*.
A. Height of the chimney is measured
from the hearth to the chimney exit.
D. The maximum length of the angled run
of the total chimney system is 20 feet. (G
plus H cannot exceed 20 feet.)
Maximum:
Minimum:
Without Elbows
With 2 Elbows*
With 4 Elbows*
BFC36
50’0”
14’6”
14’6”
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.
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.
1’ 1¹⁄₂' 3’ 4’
0
1
0
2
1
0
2
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
0
0
0
0
1
0
0
1
0
0
2
0
1
2
0
1
3
0
2
3
1
2
0
1
3
0
2
3
1
2
0
1
3
0
2
3
1
2
0
0
0
0
0
0
0
0
1
0
1
1
0
1
1
0
2
1
0
2
1
0
2
1
3
2
1
3
2
1
3
2
4
3
2
4
3
2
4
3
5
Chimney
Support
Elbow
A
IWF282
30°
Return
Elbow
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
3
3
3
3
Offset
Rise
3”
8Z\v"
11Z\v"
13Z\x"
16Z\x"
20Z\v"
21C\v"
26Z\v"
28Z\x"
31Z\x"
34Z\x"
37Z\x"
41Z\x"
45"
47Z\v"
51"
53Z\v"
56Z\v"
59Z\v"
62Z\v"
64Z\x"
68Z\v"
70Z\x"
74Z\v"
78"
81"
84"
87"
89Z\v"
93"
95Z\v"
99Z\v"
101Z\v"
104Z\v"
107Z\v"
110Z\v"
114"
117C\v"
120"
123C\v"
11”
20"
25Z\v"
29Z\v"
34Z\v"
40C\v"
43Z\x"
51Z\v"
55Z\v"
60Z\v”
65Z\x"
70C\v"
77C\v"
83C\v"
87Z\x"
94"
98"
103Z\v"
108Z\x"
113Z\x"
117Z\x"
124"
128"
134Z\x"
140C\v"
146"
151Z\v"
156Z\x"
160Z\v"
166C\v"
170C\v"
177C\v"
181C\v"
186Z\v"
191Z\x"
196C\v"
203Z\v"
209C\v"
213Z\x"
220"
Fig. 3 Chimney system requirements.
6
7412647
BFC36 Balanced Flue Heat-Circulating Fireplace
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” (25mm) from a combustible back wall and 1/2” (13mm) from a combustible
side wall or support. (Page 13, Fig. 17)
Planning the Chimney Run
LT
L1
L1
TRIPLE
WALL
81
818
83
84
TOTAL INSTALLED
LENGTH LENGTH
(LT)
(L1)
56O"
56O"
56O"
56O"
56O"
56O"
56O"
56O"
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’ (3m) or less, the top of the
chimney must be at least 2’ (610mm) above the peak
of the roof, but never less than 3’ (914mm) 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’ (3m), a chimney height
reference point is established on the surface of the
roof a distance of 10’ (3m) from the chimney in a
horizontal plane. The top of the chimney must be
at least 2’ (610mm) above the reference point, but
never less than 3’ (914mm) in height above the highest point where it passes through the roof.
0 To 10'
2' Min.
FP288a
Determine how the chimney will be run, length of run
FP288A
and chimney components required to complete
the
MBUF-INSTALLED
LENGTH
wall
job. (Fig. 4) Never install a chimney below Triple
minimum
1/28/99 djt
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’ (6m).
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’ (1.8m) above a roof line.
7412647
0 To 10'
3'
Min.
Fig. 4 Installed lengths of chimney sections.
2' Min.
3'
Min.
Reference
Point
AC246
Fig. 5 Ten Foot Rule illustration.
AC246
4/1/96
7
BFC36 Balanced Flue Heat-Circulating Fireplace
Chimney Supports
The chimney system is supported by the fireplace for
vertical chimney heights less than 30’ (9m) above the
hearth. Chimney supports are required if the vertical
height exceeds 30’ (9m). Locate chimney supports
at ceiling holes or other structural framing at 30’ (9m)
heights. Spacing between chimney supports must not
exceed 30’ (9m). 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" (64mm)
long when installed.)
Angled chimney runs require a support every 6’ 1.8m)
in addition to the elbow straps. Chimney supports are
used for this function. (Fig. 6)
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)
Chimney Support Strap
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.
TCS8A
FP284a
Fig. 6 Chimney support installation.
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
FP284a
the fireplace and/or chimney. Chases are typically built
TCS8Acut
on the outside of the house with fireplace opening
into the outer wall of a room. (Page 4, Fig.8/21/00
2)
If you need help in determining fireplace location or how
the chimney system should be run, contact your MHSC
dealer for assistance.
8
7412647
BFC36 Balanced Flue Heat-Circulating Fireplace
Hard Flat
Surface
Insulation
Platform
FPC555a
Fig. 7 Insulating between platform and fireplace.
Framing FPC555a
Framing can be constructed beforePlatform
or after the
fireplace
insulation
is set in place, however, most installers
build
the
BFC model frame
before setting the fireplace.
8/21/00 djt
Frame fireplace with 2 x 4 lumber or heavier materials. Refer to framing dimensions in Figure 1 for basic
fireplace specifications.
NOTE: Framing should be positioned to accommodate
wall covering and fireplace facing material.
Electrical Wire Installation
The fan requires 120V AC, 60 Hz power which may be
connected from the right side of the fireplace. This power connection must be completed before the fireplace is
secured and finish material applied.
The lower cavity of the fireplace may be accessed by
removing the lower grille. Lift grille and pull lower side
out to remove.
1. If using romex type power supply wiring, install a
strain relief fitting into the small access hole in the
lower right side of the fireplace outer wrapper.
2. Route house power wires into the fireplace through
the fitting.
3. Extend these wires through large front hole of right
side floor support.
7412647
4. Using supplied junction box assembly, connect and
secure house romex wiring to duplex outlet. Ensure
correct polarity and that the ground wire is securely
connected.
5. Secure romex wiring using supplied strain relief
fitting at rear of junction box. Re-assemble junction
box.
6. Secure romex wiring at strain relief fitting in fireplace
outer wrapper.
7. Mount junction box mounting plate to inside face of
right side floor support using two self-tapping sheet
metal screws.
8. Plug blower cord into duplex outlet.
9. Replace lower grille.
Chimney Set-up
Since you have already preplanned the chimney run,
you should know exactly how the installation is to
be accomplished — how much pipe is required, the
number of elbows, if any, and type of termination to be
used.
CAUTION: REPORT TO YOUR DEALERS ANY
PARTS DAMAGED IN SHIPMENT, SPECIFICALLY
CHECK THE END CONNECTION OF CHIMNEY SECTIONS AND ELBOWS.
NOTE: The BFC36 fireplace must use MHSC Model
triple wall 8” chimney components only. The installation
procedure described in this manual applies only to this
system.
Straight-Up Chimney Installation
To mark the centerline of the flue, put the fireplace in
final position and measure out from the wall: 8C\v" (222
mm). Mark a spot on the ceiling directly above the fireplace. Draw a line parallel to the back wall through this
mark. (Fig. 8)
Using a plumb bob positioned directly over center point
of fireplace flue collar, mark the ceiling to establish the
chimney center point. (Fig. 8)
Offset Installation
In order to clear an obstruction, it may be necessary to
offset chimney from vertical. This is accomplished by
using elbows. Use the 30° Offset Elbow table on Page
5 to determine proper offset and parts required.
Each offset requires two (2) elbows. The second elbow
is equipped with support straps. It is very important to
install the second elbow in each offset as close to the
ceiling or support as possible so that the elbow straps
can be secured to framing members to help support the
weight of the chimney.
9
BFC36 Balanced Flue Heat-Circulating Fireplace
Cutting the Hole
Chimney Centerline
Cover fireplace collar opening and cut proper sized
chimney hole in chimney.
Actual Centerpoint
Framing the Ceiling Hole
86M"
(222mm)
Frame the ceiling chimney hole as shown in Figure 9. It
is good practice to use framing lumber that is the same
size as the ceiling joists; this is a requirement at attic
level.
Existing
Ceiling
Joists
Plumb Line
17Z\x”
(445mm)
17Z\x”
(445mm)
Chimney
Hole
Plumb Bob
Imaginary Centerpoint
New
Framing
Members
Ceiling
FP551b
Fig. 9 Typical frame for ceiling chimney hole.
FP551b
The following table gives firestop spacer model num17 1/2"
bers:
Framing chimney hole
Chimney
Hole Size
5/13/99
djt
FPC556a
Fig. 8 Locate centerline of chimney with plumb line.
Determine offset distance of your chimney arrangement
from centerline of fireplace to centerline of chimney
where it is to pass through ceiling.
Locate center point of the chimney on ceiling as though
a straight up chimney arrangement is to be used. Measure your offset dimension fromFPC556a
straight up chimney
BFC36
center point on ceiling.
LOCATE CENTER LINE
Circulating
Ceiling Chimney
Hole/model
8/21/00 djt
Possible Obstructions
Angle of Chimney
at Ceiling
Size of Chimney
Vertical
30°
FS2A
FS6A
8” Flue
17Z\x” x 17Z\x”
17M\₈” x 29⁵\₈”
(445 x 445mm) (454 x 753mm)
Fig. 10 Ceiling chimney hole sizes necessary for installing
firestop spacer.
The inside dimension of the frame must be the same
as the hole size selected from Figure 10 in order to
provide required the 2” (51mm) air space between the
outside diameter of the chimney and the edges of the
framed ceiling hole.
The size of the hole in ceiling will vary with the angle at
which the chimney passes through ceiling.
Drive a nail up through ceiling at marked chimney center point. Go to floor above and see where hole will be
cut. Check to see where existing ceiling joists and other
possible obstructions are located...i.e. wiring, plumbing
etc... If necessary, re-position chimney and/or fireplace
to avoid obstructions.
10
7412647
BFC36 Balanced Flue Heat-Circulating Fireplace
Positioning, Safety Strips,
Securing the Fireplace
Slide fireplace into position.
Lift the fireplace front slightly and slide the metal safety
strips under front bottom edge about 1Z\x” (38 mm),
allowing the remainder to extend in front of firebox.
Overlap strips at least 1/2” (13 mm) to provide a positive joint. (Flat safety strips are packed with fireplace.)
(Fig. 11)
Metal Safety Strips
(1,2 or 3 pcs.)
Safety strips are used to ensure that any combustible
materials in front of the fireplace are protected even
though a non-combustible hearth extension is required.
If fireplace is to be elevated above the floor, a “Z”
shaped metal safety strip must be fabricated and used
to protect combustible surfaces in front of the fireplace.
This “Z” shaped safety strip is not provided but must be
fabricated of metal with each horizontal leg at least 1Z\x”
(38mm) wide and equal in length to the metals strips
provided with the fireplace.
NOTE: Safety strips are not required over non-combustible floors where all supports at the base of the
fireplace are noncombustible.
Fireplace
1Z\x”
(38mm)
Z\x” (13mm)
Min. Overlap
Platform
“Z” Safety
Strip
(not supplied)
Hearth Ext.
FP557b
Fig. 11 Safety strip installation.
WF557
BRNail Top
Standoffs
11/10/97
Four (4) nailing flanges are supplied with the fireplace
(found on the fireplace hearth). To level the box and
secure it firmly in place, remove the nailing flanges from
the hearth and install at the sides of the fireplace as
shown in Figure 12.
Nail SideNailing
Flanges
FPC549a
Fig. 12 Fasten fireplace in position.
FPC549a
BFC
Nail flange/standoff
circulating models
8/21/00 djt
7412647
11
BFC36 Balanced Flue Heat-Circulating Fireplace
Installing the
Chimney System
Pipe Section
Start by attaching the first chimney section to the collar
on top of the fireplace.
Pipe
Rim
UP
Hem
Install the pipe as pictured in Figure 13. When you
get a good lock, you will hear the pipe clearly snap
together. Once sections are snap-locked in place, it is
extremely difficult to get them apart. Make sure the
pipe is firmly snapped and locked together as each
pipe section is mounted.
Lance
Pipe
Hem
When installing elbows, only outer pipe will snaplock. Middle pipes simply slide into position. Be sure
to always attach straps on upper elbow to a structural
framing member. (Fig. 14)
Continue installing the pipe as required until pipe is
installed up through the ceiling. At this point, you must
install a firestop spacer.
Installing the Firestop Spacer
in the Ceiling Hole
FPC558a
Fig. 13 Install pipe, listening for the snap-lock to fasten.
Elbow Strap
Support Structure
A firestop spacer is used to keep pipe spaced properly
and required for safety.
Nail the firestop spacer (at each corner) to the framing
members of the ceiling hole. NOTE: A firestop spacer
is not required at the roof.
Hole sizes listed in Figure 10 for angled firestop spacers provide minimum required air space to chimney
pipe for ceiling thickness up to 8” (203 mm). When
combined thickness of ceiling material, ceiling joists
and flooring material exceeds 8” (203 mm), adjustments
must be made in framing to assure that minimum air
spaces to chimney are maintained.
Proper Firestop Spacer Installation
Figure 15 shows different installation procedures for
both an area that is an attic and an area that is not an
attic.
If the area above the ceiling is not an attic, position
the firestop spacer with the
flange on the ceiling side
and the angled portion extending up into the hole.
If the area above the ceiling is an attic, position the
firestop spacer with the
flange on the top of the
framed hole and the angled
portion extending down into
the hole.
Attic Installation
Elbow Strap
(must be tight)
FPC558a
BFC
Pipe install
Circulating models
Angled Strap 8/21/00 djt
Ceiling
Hole Framing
Angled Firestop
Chimney Support Strap
(must be tight)
FP270/271
Fig. 14 Attach straps to a structural framing
member.
FP270/271
CR Series
2/19/99 djt
Ceiling Installation
Nails (4)
Joist
Firestop
Spacer
Firestop
Spacer
Joist
Nails (4)
NOTE: If the attic insulation shield is used, the
firestop is not required in the attic installation.
FP593
Fig. 15 Installing firestop spacer.
12
FP593
SR/C
11/20/97
7412647
BFC36 Balanced Flue Heat-Circulating Fireplace
Firestop spacers are not available for, nor are they
required on vertical walls.
DO NOT put any sealant around the area where the
outer pipe slides through the firestop spacer. If you
seal this area, it may cause a fire hazard.
Canadian Requirements
for Insulation Shield
A chimney support is 2Z\x" (64 mm) long when installed.
Consider this dimension when determining how many
straight chimney sections are needed.
NOTE: Chimney supports are generally used in long
runs in a chase installation.
Additional Ceilings
In Canada, an attic insulation shield is required to
prevent attic insulation from contacting the chimney
section. NOTE: If the attic insulation shield is used, the
firestop is not required in the attic installation. Framing dimensions for the chimney hole should measure
17Z\x” x 17Z\x” (445 x 445mm). An attic shield MUST be
installed on top of attic joists (above the floor level).
(Fig. 16)
If you encounter additional ceilings, repeat same steps
required for first ceiling installation. See firestop illustration in Page 11, Figure 15.
Penetrating the Roof
Run pipe to roofline. Since chimney system must be
vented to the out-of-doors, you must use an approved
MHSC termination.
If a chase is used, refer to the installation manual provided with the termination cap.
Locate Chimney Centerpoint On Roof
Attic Insulation Shield
Nails
(4 required)
Use same procedure detailed in locating center point of
the flue system.
Drive a nail up through roof at the center point. This will
determine center point on outside of the roof.
Cut and Frame Roof Hole
Attic Joist
Ceiling
Base Flanges
FP263
Fig. 16 Attic shield installation (Canadian requirement).
NOTE: In the U.S., it is a good idea, although not always required, to install IGF263
an attic insulation shield where
MBUFto be used in the attic.
blown-in insulation is planned
5/9/96
Install the attic insulation shield with the flanges on its
base extending down into the framing hole. Nail each
corner of attic insulation shield to the framing members
of the ceiling hole using 8d nails. Attic shields are not
required at the roof.
Continue Installing Pipe to Complete Run
Continue attaching pipe sections to complete system
to next level always being careful that the pipe is firmly
snap-locked in place before proceeding to next pipe
section.
Chimney Supports
If chimney supports are required, they are installed the
same as elbows. Nail chimney support straps to adjacent structural framing, as shown on Page 8, Figure
8. Bend straps as necessary and make sure they are
secure so they will support the weight of the chimney.
7412647
Size of roof hole varies with the type of chimney
termination installed. Refer to installation instructions
provided with MHSC chimney termination to find correct
size of roof hole.
There must be a 1Z\x” (38 mm) air space between outermost portion of chimney sections and any adjacent
combustible surfaces. (Combustible surfaces include
burnable materials such as: ceiling members, joists,
flooring, combustible insulation and roof structures.)
WARNING: Do not pack required air spaces with
insulation or other materials.
Mark an outline of the roof hole around the center of the
point nail. NOTE: Hole dimensions given in the chimney top installation instructions are horizontal dimensions; therefore, the hole size must be marked on the
roof accordingly.
Cover the opening of the installed chimney so debris
cannot get into the system.
Cut and frame the hole. It is good practice to use framing lumber that is the same size as the rafters. Install
the frame securely because the chimney top and flashing anchored to the frame must be able to withstand
heavy winds.
Install Remainder of Chimney Sections
Since you have already preplanned the height of your
termination according to the Ten Foot Rule, continue to
install pipe to the predetermined height.
13
BFC36 Balanced Flue Heat-Circulating Fireplace
Check the chimney top installation instructions for
details on how high above the roof top the chimney sections (all pipes) should extend.
Air Space Clearances
Combustible framing material MUST NOT
penetrate AIR SPACE (shaded areas).
Installing Top Housing
or Termination
Follow the installation instructions provided with the
MHSC chimney termination you have selected.
Installing Chimney in a Chase
Refer to Page 4, Figure 2 for an illustration of a typical
chase installation.
CAUTION: Treatment of firestop spacers and construction of chase may vary with type of building. These
instructions are not a substitute for local building codes.
You must check your local building codes to determine
specific requirements for your city or state. NOTE:
Other building materials may be required in addition to
firestop spacers.
2”
Standoff
Z\x” air space to
sides
FRONT VIEW
SIDE VIEW
Firestop
Finishing
Wall
Shield
CAUTION: All joints between the finished wall and the
fireplace surround (top/sides) must be sealed with noncombustible material to prevent cold air leakage into
the room. Only noncombustible material may be applied
to the facing of the fireplace surround. (Black painted
area) (Fig. 17)
1” Air
Space to
Back
Z\x” Air
Space to
Sides
Finish Wall
Finish the wall with material of your choice. Do not
install a combustible mantel shelf less than 12”
(305 mm) above the grille opening. Do not install a
mantel face plate less than 6” (159 mm) from top
of grille opening. (Fig. 20) If a combustible material is
used below a flat mantel shelf, consult your local building codes for minimum clearance from top of fireplace
opening to bottom of mantel shelf.
All joints (top, bottom and sides) where wall or decorative facing material meets fireplace surround must
be completely sealed with a noncombustible material.
(Figures 18 and 19)
NOTE: No side wall protection is required for fireplaces
installed at 45° to two (2) side walls (corner installation).
14
Only noncombustible material
may be applied as
facing to the black
fireplace surround.
0” Clearance to
Floor
Hearth Extension
FPC559a
Fig. 17 Minimum clearances to combustibles.
FPC559a
BFC
AIR SPACES
circulating models
8/21/00 djt
7412647
BFC36 Balanced Flue Heat-Circulating Fireplace
Combustible
Mantel Shelf
and Trim
12"
(305mm)
Max.
Finished Wall
1Z\x"
(38mm)
Stud
12" (305mm)
Min.
Standoff
6"
(159mm)
Min.
Noncombustible
Material
Circulating
Front
Fireplace Opening
Side View
Z\x"
2 x 4 Stud
Finished Wall
Fireplace
Front
Must be sealed with noncombustible material
FP531b
Fig. 18 Mantel clearance.
FP531b
mantel clearances
9/03 djt
Face Plate
*
1Z\x"
Ref.
* 12” from top of grille opening.
** 6” from top of grille opening.
C
B
**
Combustible materials are
permitted within a shaded area
shown in Figure 21 titled
Minimum Wall Clearances.
MA81
Fig. 19 Combustible mantel clearances.
15
7412647
MA81
rev. 8/5/97
BFC36 Balanced Flue Heat-Circulating Fireplace
Side Wall Protection
Hearth Installation
Adjacent combustible side walls that are within minimum dimensions shown in Figure 23 of the fireplace
opening must be protected with MHSC Wall Shield
Model SP40 or a specifically built wall shield described
in Figure 17.
A hearth extension is required to protect a combustible
floor in front of the fireplace. Refer to Figure 20 for minimum dimensions and mounting detail.
The special wall shield design described in Figure 18 is
an alternate method of adding protection to side walls
and can be used in place of the SP40 with the same
wall clearances specified for the SP40. Rt must =1.85
minimum.
The hearth extension described in Figure 20 must be
a durable non-combustible material with a minimum
(total) Rt value of 1.09; refer to Figure 21 for examples.
The overall height (above a combustible floor), depth
and width must be as indicated, with the extension centered to the fireplace opening.
Note: Hearth Extension must not cover the air inlet
opening of a fireplace.
Examples of wall shield insulation:
1. Manville - CERAFORM 126, K=.27,
1/2 inches thick
The top of insulation must be covered with a non-combustible decorative covering or a piece of .018” minimum sheet metal, to protect hearth extension material.
(Fig. 20)
2. EH2416, K = .458,
1 inch thick required.
Secure the hearth extension to the floor to prevent
shifting, using trim molding or other similar means at
three (3) outer edges. Seal crack between the fireplace
hearth and hearth extension with a non-combustible
material. (Figs. 20 and 22)
Minimum Hearth Extension Dimensions
Minimum Wall Clearances
WITH
Noncombustible
Surround Facing
WITHOUT
Noncombustible
Surround Facing
Shaded area
starts 1/2" from
away from edge
of unit
4"
4" Brick
(Example material)
E
C**
Side
Wall
(for On-Site Construction)
Firebox
Opening
F**
E
D
A - Min. clearance
to combustible
perpendicular wall
Side
B - Min. clearance
Wall
to combustible
perpendicular wall when
using noncombustible wall shield*
Combustible material permitted within shaded area.
* Noncombustible wall shield requires 1" EH2416
insulation (minimum R Value = 1.85) between decorative
noncombustible rigid covering and combustible wall.
Minimum height and width is 40" x 40".
** Dimension/degree of angle will vary depending on thickness
of noncombustible surround facing.
BFC36
A
B
26”
12”
660 mm 305 mm
C
17°
D
25°
H
G
G
J
May install
noncombustible
decorative
covering
OR .018" min.
sheet metal
Seal cracks
between the
fireplace
and hearth
extension with
noncombustible
material
Fireplace
Hearth
4" MIN.
Combustible
Floor
E
12”
305 mm
Minimum
Insulation
Value "R"
Safety strips
must overlap
56O" minimum
F
G
H
J
8”
8”
18”
47Z\v”
203 mm 203 mm 457 mm 1200 mm
FP594b
Fig. 20 Combustible side wall protection and hearth extension dimensions.
16
FP594b
BFC combustible min.
8/21/00 djt
7412647
BFC36 Balanced Flue Heat-Circulating Fireplace
WARNING: Hearth extension must be installed in
accordance with Figure 22 and must not cover the
bottom front opening of the circulating model.
Alternate noncombustible materials may be used providing the (total) thermal resistance (Rt value) of the alternate material employed is greater than or equal to R
= 1.09 Thermal resistance (R) or thermal conductivity
(K), may be obtained from manufacturer of the material.
Factors are related by the formula K = 1/R. (Fig. 21)
T = given thickness
R = thermal resistance for a given thickness (T)
K = thermal conductivity
Noncombustible material with a lower R value may
be used, provided thickness of material is sufficiently
greater to maintain an equivalent (total) thermal resistance (Rt).
Wall Covering
Side View
Noncombustible
Decorative Facing
2 x 4” Header
- Do not notch at
standoffs
Seal all cracks
between fireplace
surround and wall
materials with noncombustible material.
Noncombustible Decorative
Covering
Hearth Extension Insulation
Seal crack between
fireplace and hearth
extension with noncombustible material
FP550
Safety Strips Must be overlapped 1/2”
minimum
COMMON MATERIALS AND FACTORS
MATERIAL
E H 2416
(MHSC)
K*
R
0. 458 1. 09
MINIMUM
THICKNESS
0. 50 i n . * *
Fig. 22 Sealing gaps.
Co m m o n Bri ck
5. 0
0. 10
Glass Door Operation
5. 46 i n . * *
FP550
- SEALING
The BFC36 is intended for useBR/BC
only with
the doors fully
DETAILS
closed. (Fig. 23)
9/29/97
R V al u e i s f o r 1/2 i n ch .
* U n i ts o f K = BT U /S Q FT /H R /˚F/IN
* * T h i ckn
e ss o f L i ste d M ate ri al
FP533ADD
Fig. 21 Hearth extension material factors.
Example of Determining
Extension
FP 533A D Hearth
D
A dde n du m
Equivalents
6/1/99 djt
8/4/99 required
ch an g e d . for
2 to any
. 1 new mateTo determine the thickness
o n e i n ch to 1/2 i n ch
djt
rial:
NEW
required
thickness
K of new material (per inch)
= --------------------------------------- X
K of listed material (per inch)
thickness
of listed
material
Example for Common Brick
T (new) = 5.0/0.458 x 0.50 in. = 5.46 in. (new required
thickness).
7412647
Correct
Wrong
KT108b
Fig. 23 Correct door position.
KT108b
BFC
Correct door position
8/23/00 djt
17
BFC36 Balanced Flue Heat-Circulating Fireplace
Operation
Before the first fire, the location of the upper refractory
baffle (ceiling panel) should be checked. This part floats
intentionally and may move out of place during shipping or installation of the fireplace. If the baffle is out
of place, the resulting improper air flow will cause dirty
glass and improper combustion. The baffle should be
centered side-to-side between the refractory sidewalls
and be pulled forward (toward the glass doors) until it
rests on the front sheet metal ledge.
Refer to the publication “How to Enjoy Your Woodburning Fireplace” for starting and maintaining a wood fire.
Note that the BFC36 does not have a damper to open
or close. This is a tremendous efficiency increasing
advantage since there is no damper to potentially leave
open after a fire dies down. House air will not escape
up the chimney. Note also that the doors should remain
closed at all times except when starting or reloading a
fire.
Burn only seasoned firewood. Typically, only two or
three burning logs are needed to provide efficient supplemental heat and a bright decorative fire. In general,
fresh wood should not be loaded higher than about 2/3
the height of the firebox.
Installing Line for Gas Logs
MHSC fireplaces are designed to accept a 1/2” (13 mm)
gas line for installation of an approved gas appliance.
(MHSC manufactures a wide variety of gas logs for use
in MHSC fireplaces.)
Be sure to have the appliance installed in accordance
with building codes.
Gas connection may enter from either left or right side
of the fireplace.
Locate appropriate gas line in the outer casing of fireplace and remove insulation from gas line tube. (Fig.
24)
From inside the fireplace, locate the knockout on the
firebrick -- be sure you are on the appropriate or “gas
line” side of the fireplace. Using a flat bladed screwdriver or small chisel and hammer, carefully tap around
the knockout until it loosens and falls out.
Hole in Outer Casing
Gas Line
Tube
Fireplace Top View
1"
Min.
Supply
Line
Ceramic
Knockout
Repack Insulation
1/2"
Hole in
Outer Casing
Ceramic Knockout
(both sides)
FP560a
Fig. 24 Gas line access.
FP560a
BFC
line knockout
BTU input of a gas appliance installedGas
in fireplace
8/00
should be rated less than 100,000 BTU/Hr.
Gas pipe installation is intended for connection to a
decorative gas appliance only when (1.) incorporating
an automatic shutoff device and (2.) complying with the
Standard for Decorative Gas Appliances for Installation in Vented Fireplaces (ANSI Z21.60) or CSA draft
requirements for Gas-Fired Log Lighters for Woodburning Fireplaces (Draft No. 4, August 1993).
Decorative gas appliance should be installed in accordance with the National Fuel Gas Code, ANSI Z223.1/
NFPA 54 (latest edition).
CAUTION: When using decorative gas
appliance, flue damper must be set in fully
open position. Glass doors on the fireplace
must also be fully opened.
WARNING: Do not operate an unvented gas
log set in this fireplace with the chimney
removed.
WARNING: When installing an unvented
gas log set, the model CABL or CABR 4”
adjustable hood must be used.
Install 1/2” (13 mm) certified gas pipe through opening.
After gas pipe installation is complete, use insulation
that was removed from gas line tube to repack space
around the pipe. Material should be inserted from
outside of the fireplace and packed tightly to totally seal
between the pipe and tube.
NOTE: Gas pipe should not come in contact with
any wood structures until it has reached a point at
least 1” (25 mm) away from fireplace side.
18
7412647
BFC36 Balanced Flue Heat-Circulating Fireplace
4
3
1
5
2
6
8
10
15
9
16
14
7
12
11
13
18
29
17
26
27
28
21
19
23
20
22
25
24
23
MHSC reserves the right to make changes in design, materials, specifications, prices and discontinue colors and products at any time, without
notice.
BFC Balanced Flue Fireplace
Ref.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
Description
Top Grille - Painted
Bottom Grille - Painted
Grate Assembly
Left Door Assembly Complete
Right Door Assembly Complete
Rear Firebrick
Side Firebrick (two per fireplace)
Hearth Firebrick
Nailing Flange (four per fireplace)
Fiberglas Rope Gasket (Outer Collar)
Top Refractory
Front Brick Retainer
Cable Clip (For Blower Assembly)
Plug Button (two per fireplace)
Left Door Gasket
Right Door Gasket
7412647
647
BFC parts 2008
2/08 djt
BFC36
3126160
3126160
7579218
30004361
30004362
2353145
2353146
2353140
2422198
7547137
2353147
2353163
7522241
7522239
20013999
20013998
19
BFC36 Balanced Flue Heat-Circulating Fireplace
BFC Balanced Flue Fireplace
Ref.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
20
Description
Blower Assembly - FKSX-A
Grate Retainer
Junction Box Assembly
Ceramic Glass Panel (two per fireplace)
Flat Gasket 3/4” Wide (two per fireplace)
Knob (two per fireplace)
Bushing (four per fireplace)
Pan Hd, PH 1/4-20 x 1 Black (two per fireplace)
Spacer (two per fireplace)
Spring Clip
#8-18 x 1/2” Decorative Screw
Hinge Spacer (two per fireplace)
BFC Door Assembly
(continued)
BFC36
20000620
2353179
3126161
30004352
20013997
1600657
1201895
1200907
1600070
30004450
7521180
30004360
20014006
7412647
BFC36 Balanced Flue Heat-Circulating Fireplace
Accessories
The following accessories for this appliance are available from your local MHSC distributor. Should you need additional information beyond what your distributor can furnish, contact: MHSC, 149 Cleveland Drive, Paris, KY 40361,
Attn: Technical Services.
CAUTION: This fireplace and chimney assembly is a highly engineered system, and, as such, must be operated only with MHSC approved components. If you use an unapproved component to make any modifications,
you may create a possible fire hazard and will void the MHSC warranty. In addition, such action may void the
coverage provided by the owner’s insurance.
Accessory
Hearth Extension Insulation
Grate for BR/BC36/42
Hearth Patch Compound
Description
Provides hearth extension floor protection
Holds firewood in firebox
Patch cracks in hearth
Model Number
EH2416
RBG-BFC36
HPC-1
See your MHSC Fireplaces distributor or dealer
for finishing Marble and Mantels, available in a
wide selection of styles.
7412647
21
BFC36 Balanced Flue Heat-Circulating Fireplace
Chimney Components
Component
Chimney Support
Firestop
Attic Insulation Shield
Traditional Top Housing
Housing Extension
Contemporary Chase Top
Termination
Chase Top Housing
Contemporary Flashing
Description
Used to support chimney for each of
30’ vertical height and 6’ of angled chimney run
Required at each floor level and attic on
multi-story installation
Required in Canada
Top housing of simulated brick pattern
available in red, tan or white. Appropriate
adapter is required (8CA). Flashing included.
Extends Traditional Top Housing on
steep pitched roofs
Used to terminate chimney at the top of a
chase. Flashing is not included.
Adapter Kit (TT8CB) is required.
Used with chase terminations to prevent rain entry.
Required for Contemporary Round Top
termination to prevent rain entry.
Chimney Sections
Used to build chimney systems.
Chimney Elbows
Round Top Termination
Extended Round Top Chase
Termination
Adapter Kit
Adapter Kit
22
Used to develop offset chimney systems.
Only 30° elbows are available. (Elbows
packed 2 per carton - upper and lower
elbow set.)
Used to terminate chimney on the roof.
Flashing not included.
Used to terminate chimney at the top of a
chase. Adapter Kit included. Flashing not
included.
Required to connect triple-wall chimney
with Traditional Top Housing (T20B or TL20B)
Required to unite chimney with
Contemporary Chase Top. (TT200C)
Model Number
TCS8A
(8” flue)
FS2A (8” straight flue)
FS6A (8” 30° inclined flue)
FS2100HT
T20B
(single flue)
TL20B
(extra tall single flue)
202036
(single flue)
TT200C
FL88
(8” flue)
8-6-12 with 8” flue
0 to 6/12 pitch
8-12-12 with 8” flue
(6/12 to 12/12 pitch)
8” flue
81 (1’ long)
818 (1Z\x’ long)
83 (3’ long)
84 (4’ long)
830A-2
(8” 30° flue)
RT8C
(8” flue)
RT8CL
(8” flue)
8CA
(8” flue)
TT8CB
7412647
BFC36 Balanced Flue Heat-Circulating Fireplace
LIMITED WARRANTY
Factory-Build Fireplace and Components
(Except Blowers)
What is Covered and For How Long
Five-Year Coverage: For five years from the date this fireplace and components are first purchased for use, MHSC
will, at its option, repair or replace any defective part of this fireplace or components, or refund to you a sum not to
exceed the factory retail price in effect at the time of purchase.
Ten-Year Coverage: From the sixth through the tenth year following the date this fireplace or accessory is first
purchased for use, MHSC will make available to you, at our factory, a free replacement for any defective part in this
fireplace or accessory.
Twenty-Five-Year Availability of Replacement Parts: From the eleventh through the twenty-fifth year following the
date this fireplace or accessory is first purchased for use, MHSC will make available at our factory replacement parts
for this fireplace or accessory, which you may purchase for the list price current at the time your purchase order is
received.
What is Not Covered
•
•
•
•
•
•
•
•
•
•
•
This limited warranty does not cover:
Transportation or shipping cost.
The cost of a service call to diagnose trouble.
Painted surfaces.
Damage or defect caused by improper installation, accident, misuse, abuse or alteration.
Poor ventilation of smoke or gases caused by air-conditioning and heating systems, exhaust fans, or pressure differentials produced by wind.
Broken glass components.
Cracks in ceramic and castable parts that do not affect safe operation.
We do not warrant this fireplace to be in compliance with your local building code. Building codes vary greatly
throughout the country, and you should determine whether your local building code contains restrictions on the use
of this fireplace before you purchase it.
Blowers or fans, which are warranted separately.
Heat loss due to the passage of heat or air through or around the fireplace.
Also, under our five year coverage, we do not pay the cost of removal and replacement of any portion of the structure
in which the fireplace is situated, made necessary by the repair, removal or re-installation of the fireplace.
And under our twenty-five year warranty of availability of replacement parts, we only promise to maintain a supply of
replacement parts at our factory for you to purchase.
Limitations and Exclusions
1. No one has authority to add to or vary this limited warranty, or to create for MHSC any other obligations of liability
in connection with this fireplace and accessory.
2. MHSC shall not be liable for incidental, consequential, special or contingent damages you might suffer as a result
of its breach of this written warranty or any implied warranty. Some states do not allow the exclusion of limitation of
incidental or consequential damages, so the above limitations may not apply to you.
3. This warranty applies only to a fireplace sold and used in the United States.
For information about this warranty, contact:
MHSC
149 Cleveland Drive
Paris, Kentucky 40361
7412647
23
MHSC
149 Cleveland Drive • Paris, Kentucky 40361
www.mhsc.com
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