Monessen Hearth M400BFC Mounting instructions

647

BFC cover

8/18/00 djt

M400BFC

Balanced Flue (Closed Combustion)

Heat-Circulating Fireplace

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

Homeowner’s Installation and

Operating Manual

M400BFC Balanced Flue Heat-Circulating Fireplace

87D1505

M400BFC

Listed

UL127 / ULC-S610

Standard for Factory Built Fireplaces

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

Table of Contents

M400BFC Balanced Flue Heat-Circulating Fireplace

87D1505

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 re-

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 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;

• Installation and/or use of any component part

not manufactured or approved by MHSC in

combination or assembly with a MHSC fire-

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 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.

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.

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 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 fireplace.

M400BFC Balanced Flue Heat-Circulating Fireplace

87D1505

M400BFC Balanced Flue Heat-Circulating Fireplace

Fig. 1 M400BFC specifications 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

M400BFC 32Z\x" 20M\zn" 17C\v"

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

FP1531

Fig. 1a Hearth dimensions.

M400BFC Balanced Flue Heat-Circulating Fireplace

87D1505

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

firestop)

FP554c

Fig. 2 Fireplace and chase parts identification.

M400BFC Balanced Flue Heat-Circulating Fireplace

87D1505

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.

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.

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.

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

M400BFC Balanced Flue Heat-Circulating Fireplace

87D1505

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 sur-

faces:

1. A flat 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 fireplace.

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

bustible back wall and 1/2” (13 mm) 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’ (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 extend-

ing more than 6’ (1.8 m) 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 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 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.

3’

Min.

0 To 10’

3’

Min.

0 To 10’

AC246

4/1/96

Reference

Point

AC246

Fig. 5 Ten Foot Rule illustration.

M400BFC Balanced Flue Heat-Circulating Fireplace

87D1505

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)

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 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.

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 be-

tween 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 insu-

lated enclosure, be sure all required air spaces

are maintained. (Page 13, Fig. 17)

M400BFC Balanced Flue Heat-Circulating Fireplace

87D1505

FPC555a

Platform insulation

BFC model

8/21/00 djt

Hard Flat

Surface

Insulation

Platform

FPC555a

Fig. 7 Insulating between platform and fireplace.

Framing

Framing can be constructed before or after the fireplace

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

before setting the fireplace.

Frame fireplace with 2 x 4 lumber or heavier materi-

als. Refer to framing dimensions in Figure 1 for basic

fireplace specifications.

NOTE: Framing should be positioned to accommodate

wall covering and fireplace facing material.

Installing Electrical Wire

The fan requires 120VAC, 60 Hz power which may be

connected to the right side of the fireplace using the

romex pigtail provided with teh unit. This power must

be completed before the fireplace is secured and finish

material applied.

1. Attach the white wire from house power to the white

wire of the romex pigtail and secure with a wire nut.

2. Attach the black wire from the house power to the

black wire of the romex pigtail and secure with a

wire nut.

3. Attach the ground wire from house power to the

ground wire of the romex pigtail and secure with a

wire nut. (Fig. 8)

IMPORTANT: The wire nuts must be tight.

NOTE: Check local building codes to determine if

junction box is required at the romex pigtail/house wire

connection Also check junction box and speed control

(SCVS) installation instructions.

The Model FKSX-A blower assembly is preinstalled in

the M400BFC.

FP1062

romex pigtail

8/21/00 djt

Romex Pigtail

(Provided)

Fireplace Electrical

Coverplate

Wire Nuts

(Not pro-

vided)

Ground

Black

White House

Wiring

(120V

60Hz)

FP1062

Fig. 8 Wiring diagram.

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 M400BFC 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 fire-

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

mark. (Fig. 9)

Using a plumb bob positioned directly over center point

of fireplace flue collar, mark the ceiling to establish the

chimney center point. (Fig. 9)

M400BFC Balanced Flue Heat-Circulating Fireplace

87D1505

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.

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. 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 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.

Cutting the Hole

Cover fireplace collar opening and cut proper sized

chimney hole in chimney.

Framing the Ceiling Hole

Frame the ceiling chimney hole as shown in Figure

10. 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 inside dimension of the frame must be the same

as the hole size selected from Figure 11 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.

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. 9 Locate centerline of chimney with plumb line.

The following table gives firestop 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)

New

Framing

Members

Existing

Ceiling

Joists

Fig. 10 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. 11 Ceiling chimney hole sizes necessary for installing

firestop spacer.

Table of contents

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