Monessen Hearth BFC36 Manual de usuario

647

BFC cover

8/18/00 djt

BFC

Balanced Flue

(Closed Combustion)

Heat-Circulating Fireplace

Model:

BFC36

For use in the U.S. / Canada

Underwriter’s Laboratories

Report No. MH7603

DO NOT DISCARD THIS MANUAL: Retain for future use.

7412647 5/12 Rev. 20

Homeowner’s Installation and

Operating Manual

BFC36 Balanced Flue Heat-Circulating Fireplace

7412647

Safety Information ......................................................................................3

Specications and Framing .......................................................................4

Parts Identication ....................................................................................6

Chimney Requirements ............................................................................7

Planning Information ..................................................................................8

Installation .................................................................................................9

Replacement Parts ..................................................................................19

Accessories .............................................................................................21

Warranty...................................................................................................23

Table of Contents

BFC36

Listed

UL127 / ULC-S610

Standard for Factory Built Fireplaces

BFC36 Balanced Flue Heat-Circulating Fireplace

7412647

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 re hazard and will void the warranty.

Description

The BFC36 replace is a solid fuel, woodburning re-

place. The BFC36 is a balanced ue (closed combus-

tion) heat-circulating replace which receives outside

combustion air through the chimney system. This

unique system results in much higher efciency since

valuable room air is not used for combustion.

The BFC36 is a decorative replace which provides

efcient supplemental heat compared to other wood

burning replaces. It should not be used as a primary

source of heat.

CAUTION: Overloading the rebox with wood may re-

sult in overring and damage to refractory components,

the grate and doors.

Precautions

MHSC replaces 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 replace or component

parts, immediately report damage to your MHSC dealer.

Only use MHSC components or the warranty will be

voided and a re 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 qualied

installer, preferably NFI or WETT (Canada)

certied.

• Installation of any damaged replace or chim-

ney component;

• Modication of replace, chimney assembly

or any component parts thereof; (except for

chase ashings as detailed in MHSC Chimney

Top installation instructions).

• Installation other than as instructed by MHSC;

• Installation and/or use of any component part

not manufactured or approved by MHSC in

combination or assembly with a MHSC re-

place system, notwithstanding any indepen-

dent testing laboratory or other third party

approval of such component parts or acces-

sory.

Any such action may possibly cause a re hazard.

Consult local building codes to ensure that you are in

compliance before installing the replace.

This replace 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 replace surround.

Burn only solid wood fuel or gas logs.

The BFC36 is intended for operation only with the

doors closed.

Do not install a solid fuel burning insert or other

products not specied for use with this replace.

Drafts

The replace should not be located in areas that create

drafts (ie: frequently opened doors and central heating

air inlets/outlets) that hamper the normal ow of air into

the re.

Gas Logs

If you plan to install a gas log, the gas line should be

installed before framing the replace. The gas line must

be installed by a certied gas line installer.

Proposition 65 Warning: Fuels used in gas, wood-

burning or oil red appliances, and the products of

combustion of such fuels, contain chemicals known

to the State of California to cause cancer, birth de-

fects and other reproductive harm.

California Health & Safety Code Sec. 25249.6

WARNING: Check with your electronics manufac-

turer before installing a television or other electron-

ic device above this replace.

BFC36 Balanced Flue Heat-Circulating Fireplace

7412647

BFC36 Balanced Flue Heat-Circulating Fireplace

Fig. 1 BFC36 specications and framing.

6" (16mm)

56O" (13mm)

56O"

326"

(829mm)

41(6" (1064mm)

6"

(16mm)

56QE"

(49mm)

" (914mm)

"

(533mm)

56QE" (176mm)

56QE" (179mm)

Recessed

Nailing

Flange

647

BFC36 specs

8/18/00 djt

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)

FP1531

hearth dimensions

9/04 djt

Front Width Back Width Depth

A B C

BFC36 32Z\x" 20M\zn" 17C\v"

(826 mm) (519 mm) (451 mm)

FP1531

Fig. 1a Hearth dimensions.

BFC36 Balanced Flue Heat-Circulating Fireplace

7412647

FP554a

BFC

Fireplace and chase parts identification

circulating model

8/21/00 djt

Termination Cap

Storm Collar

Pan Flashing

Draftstop

Standoff

Surround

Trim Ledge

Standoff

Glass Door

Romex Pigtail

Gas Line Access Knock-

out (Each Side)

Air Inlet

Basket Grate

Bottom Grille

Metal Safety Strip(s)

Shown not inplace

(1,2 or 3 pieces)

Nailing Flange

Top Grille and Air Outlet

Gas Line Ac-

cess Hole

(Each Side)

Ceiling Level

Firestop

Batt Insulation

(Cut out around

restop)

FP554c

Fig. 2 Fireplace and chase parts identication.

BFC36 Balanced Flue Heat-Circulating Fireplace

7412647

Rise

Offset

6 FT.

Hearth

Floor

Chimney

Section

CHIMNEY FLUE EXIT

Elbow

FP269

MBUF

5/16/96

rev. 5/25

TCS8A

Support

Example 1 Example 2 Example 3

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.

BFC36

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 (rst) elbow of any pair does

not have straps.

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 replace to the centerline of the

chimney where it is to pass through the

rst ceiling.

NOTE: This offset distance may not be

your full offset distance. See Examples 2

and 3.

Fig. 3 Chimney system requirements.

IWF282

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"

30˚ Elbow Offsets

1’ 1¹⁄₂'3’ 4’

Chimney

Support

Offset Rise

FP282

MBUF

5/26/96

Offset

Rise

30°

Return

Elbow

30°

Return

Elbow

30°

Offset

Elbow

30°

Offset

Elbow

BFC36 Balanced Flue Heat-Circulating Fireplace

7412647

Planning Information

Preplanning an installation is very important to ensure

safety and to save time and money. An installer must

predetermine where a replace will be set and how the

chimney system will be run.

Mounting the Fireplace

A replace may only be mounted on the following sur-

faces:

1. A at combustible surface.

2. A raised wooden platform.

3. A concrete block or other solid object placed be-

neath each of the four (4) corners of the replace.

The replace must be spaced 1” (25mm) from a com-

bustible back wall and 1/2” (13mm) from a combustible

side wall or support. (Page 13, Fig. 17)

Planning the Chimney Run

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 neces-

sary 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 replace may be

used.

6. A guy wire stabilizer is required for chimneys extend-

ing more than 6’ (1.8m) above a roof line.

The Ten Foot Rule

Major U.S. building codes specify a minimum chimney

height above the roof top. The “Ten Foot Rule” is a re

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 high-

est point where it passes through the roof.

LTTOTAL

LENGTH

(LT)

INSTALLED

LENGTH

(L1)

56O"

56O"

56O"

56O"

56O"

56O"

56O"

56O"

FP288A

MBUF-INSTALLED LENGTH

Triple wall

1/28/99 djt

TRIPLE

WALL

818

FP288a

Fig. 4 Installed lengths of chimney sections.

2' Min.

Min.

0 To 10'

Min.

0 To 10'

AC246

4/1/96



Reference

Point

AC246

Fig. 5 Ten Foot Rule illustration.

BFC36 Balanced Flue Heat-Circulating Fireplace

7412647

Chimney Supports

The chimney system is supported by the replace 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 replace.) Support provided by elbow straps fullls

the support requirement only if they are spaced as pre-

viously 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)

FP284a

TCS8A

8/21/00

Chimney Sup-

port Strap

TCS8A FP284a

Fig. 6 Chimney support installation.

Chase Installation

A chase is a vertical box-like structure which encloses

the replace and/or chimney. Chases are typically built

on the outside of the house with replace opening cut

into the outer wall of a room. (Page 4, Fig. 2)

If you need help in determining replace location or how

the chimney system should be run, contact your MHSC

dealer for assistance.

Installation

Insulating Fireplace Enclosure

for Cold Climates

If you live in a cold climate, it is not required but

highly recommended that you insulate replace

enclosure to eliminate cold air penetration as much

as possible.

Insulate base of replace with a noncombustible

insulation rated for a minimum of 300°F. Insulating

is very important for outside wall installations over

a concrete slab. If replace is installed on a platform,

insulation should be placed on top of the platform

before replace is set. (Fig. 7)

When a replace 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 restop at

the rst ceiling level above the replace and enclose

the chase with sheeting material. Insulation may

then be installed above sheeting material to assure

the space around the replace is totally protected.

(Fig. 2)

When installing the chimney, DO NOT caulk be-

tween outer pipe and restop. It is vital that some air

be allowed to ow through this very thin gap.

CAUTION: When installing a replace in an insu-

lated enclosure, be sure all required air spaces

are maintained. (Page 13, Fig. 17)

BFC36 Balanced Flue Heat-Circulating Fireplace

7412647

FPC555a

Platform insulation

BFC model

8/21/00 djt

Hard Flat

Surface

Insulation

Platform

FPC555a

Fig. 7 Insulating between platform and replace.

Framing

Framing can be constructed before or after the replace

is set in place, however, most installers build the frame

before setting the replace.

Frame replace with 2 x 4 lumber or heavier materi-

als. Refer to framing dimensions in Figure 1 for basic

replace specications.

NOTE: Framing should be positioned to accommodate

wall covering and replace facing material.

Electrical Wire Installation

The fan requires 120V AC, 60 Hz power which may be

connected from the right side of the replace. This pow-

er connection must be completed before the replace is

secured and nish material applied.

The lower cavity of the replace 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 tting into the small access hole in the

lower right side of the replace outer wrapper.

2. Route house power wires into the replace through

the tting.

3. Extend these wires through large front hole of right

side oor support.

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

tting at rear of junction box. Re-assemble junction

box.

6. Secure romex wiring at strain relief tting in replace

outer wrapper.

7. Mount junction box mounting plate to inside face of

right side oor 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 SEC-

TIONS AND ELBOWS.

NOTE: The BFC36 replace 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 ue, put the replace in

nal position and measure out from the wall: 8C\v" (222

mm). Mark a spot on the ceiling directly above the re-

place. Draw a line parallel to the back wall through this

mark. (Fig. 8)

Using a plumb bob positioned directly over center point

of replace ue 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.

BFC36 Balanced Flue Heat-Circulating Fireplace

7412647

Determine offset distance of your chimney arrangement

from centerline of replace 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. Mea-

sure your offset dimension from straight up chimney

center point on ceiling.

Ceiling Chimney Hole/

Possible Obstructions

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 cen-

ter point. Go to oor 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 replace

to avoid obstructions.

FPC556a

BFC36

LOCATE CENTER LINE

Circulating model

8/21/00 djt

86M"

(222mm)

Chimney Centerline

Actual Center-

point

Plumb Line

Plumb Bob

Imaginary Center-

point

FPC556a

Fig. 8 Locate centerline of chimney with plumb line.

New

Framing

Members

Existing

Ceiling

Joists

Fig. 9 Typical frame for ceiling chimney hole.

FP551b

17 1/2"

Framing chimney hole

5/13/99 djt

Ceiling

Chimney

Hole

17Z\x”

(445mm) 17Z\x”

(445mm)

FP551b

Fig. 10 Ceiling chimney hole sizes necessary for installing

restop spacer.

Cutting the Hole

Cover replace collar opening and cut proper sized

chimney hole in chimney.

Framing the Ceiling Hole

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.

The following table gives restop spacer model num-

bers:

Chimney Hole Size

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)

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.

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