Heatilator MH36A, MH39A, MH42A Operating Instructions Manual
INSTALLATION & OPERATING
INSTRUCTIONS
MH36A MH39A MH42A
WOODBURNING FIREPLACE
FOR MANUFACTURED HOUSING
Note: An arrow () found in the text signifies change in content.
Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this
manual. For assistance or additional information, consult a qualified installer, service agency or the gas supplier.
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WARNING!
MH SERIES INSTALLATION INSTRUCTIONS
TABLE OF CONTENTS
Safety Precautions ...................................................................................................................................... 2
Design and Installation Considerations ....................................................................................................... 3
A. Listings and Code Approvals ....................................................................................................................... 4
B. Description of the Fireplace System ............................................................................................................ 4
C. System Components................................................................................................................................... 5
D. Pre-Installation Preparation ......................................................................................................................... 9
E. Chimney Requirements ............................................................................................................................. 11
F. Fireplace Installation ................................................................................................................................. 14
G. Operating Instructions ............................................................................................................................... 22
H. Maintenance Instructions .......................................................................................................................... 26
Index ......................................................................................................................................................... 27
Warranty ................................................................................................................................................... 28
CAUTION:
Do not expose the fireplace to the elements (i.e. rain, etc.) and keep the fireplace dry at all times. Wet insulation
will produce an odor when the fireplace is used.
WARNING!
This fireplace is tested and listed for use only with the optional accessories listed in these instructions. Use of
optional accessories not specifically tested for this appliance could void the warranty and/or result in a safety
hazard.
Safety Precautions
1. Please read these installation instructions completely before beginning installation procedures. Failure to follow
them could cause a fireplace malfunction resulting in serious injury and/or property damage.
2. Always check your local building codes prior to installation. The installation must comply with all local, regional,
state and national codes and regulations.
3. An adequate supply of replacement combustion air from outside the house must be available to the fire for the
fireplace to operate properly. To achieve this, the use of the optional outside air kit is highly recommended.
In the event the home is unusually tightly sealed, the optional combustion air kit may not provide all the air required
to support combustion. Hearth & Home Technologies is not responsible for any smoking or related problems that
may result from the lack of adequate combustion air. It is the responsibility of the builder/contractor to ensure that
adequate combustion air has been provided for the fireplace.
4. The fireplace must be installed with the Hearth & Home Technologies SL Series Chimney System.
The chimney system must always terminate outside the building. Be sure to follow all chimney specifications given
in these installation instructions.
5. NEVER leave children unattended when there is a fire burning in the fireplace.
6. This fireplace is built for solid fuel only. NEVER use gasoline, gasoline type lantern fuel, kerosene, charcoal light
fluid, or similar liquids in this fireplace. Keep any flammable liquids a safe distance from the fireplace.
7. DO NOT use chimney cleaners or flame colorants in your fireplace.
8. The flue damper must be open at all times when the fireplace is in use.
9. While servicing this fireplace, always shut off any electricity or gas to the fireplace. This will prevent possible electric
shock or burns. Also, make sure the fireplace is completely cooled before servicing.
10. To ensure a safe fireplace system and to prevent the build up of soot and creosote, inspect and clean the fireplace
and chimney prior to use and periodically during the burning season. See “Maintenance Instructions” in this manual
for cleaning instructions.
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MH SERIES INSTALLATION INSTRUCTIONS
DESIGN AND INSTALLATION CONSIDERATIONS
When selecting a location for your woodburning fireplace, it is important to evaluate a number of considerations. Modern
construction techniques can create conditions that may not allow your chimney to draft properly. This may result in smoke
spillage from your fireplace, as well as cause other combustion appliances to operate incorrectly.
Tightly sealed construction is important for energy efficiency. Unfortunately, a great deal of effort has been directed to
tightening up sidewall construction, while considerably less attention has been paid to tightening upper portions of the
warm air envelope (insulated ceilings). This has increased the “Stack Effect”, a condition that increases the negative
pressure generated by the structure. This negative pressure will directly affect the drafting performance of a fireplace
chimney. To minimize the negative pressure generated by stack effect, make certain that all duct work installed in the attic
spaces is sealed airtight. Minimize the number of recessed light fixtures installed in the insulated ceiling, and use sealed
recessed light fixtures. Finally, make certain the whole house fans and attic access panels are tightly sealed. These are
important design considerations that must be observed during the design and construction stage of the home.
If you desire to put a fireplace in your basement, we recommend that you consider a direct vent gas fireplace. Basements
always have a significant negative air pressure that causes the fireplace system to be more susceptible to smoke spillage
and cold flue back drafting. Since direct vent gas fireplaces are sealed, they are not affected by the negative pressure that
exists in basements.
Finally, woodburning fireplaces perform best when their chimney (roof termination) is located on the upper half of the roof,
especially when cathedral ceilings are present. Chimneys that are located on the lower half of the roof realize what is
known as “lazy flue” and will not draft as well as a chimney that is located in the upper portion of the roof. The reason for
this is that the stack effect generated by the overall height of the living spaces inside the house will exceed the draft
generated by the chimney system. If you desire to place a woodburning fireplace in a location where the termination cap
would be located on the lower half of a roof, such as on an outside wall at the base of a cathedral ceiling, we recommend
that you consider using a direct vent gas fireplace. This will assure the homeowner a fireplace that operates correctly.
These properties do not affect just your woodburning factory built fireplace. They can cause any woodburning fireplace as
well as any conventionally vented (B-vent) gas appliance to operate improperly. Careful planning at this stage of your
project will ensure satisfaction with the operation of your fireplace once it is completed.
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MH SERIES INSTALLATION INSTRUCTIONS
A. LISTINGS AND CODE APPROVALS
This fireplace system has been tested and listed in
accordance with UL-127 and ULC-S610 standards, and
has been listed by Underwriters Laboratories Inc. for
installation and operation in the United States as described
in this manual.
This fireplace has been tested and listed for use with the
optional components listed on page 5. These optional
components may be purchased separately and installed at
a later date. However, installation of an outside air kit will
require significant reconstruction, and should be installed
at the time of the initial fireplace installation.
WARNING!
This fireplace and its components are designed to be installed and operated as a system. Any alteration to or
substitution for items in this system, unless allowed by these installation instructions, will void the Underwriters Laboratories listing and may void the product warranty. It may also create a hazardous installation. Read
through these instructions thoroughly before starting your installation and follow them carefully throughout
your project.
Check with your local building code agency prior to
installing this fireplace to ensure compliance with local
codes, including the need for permits and follow-up
inspections. If you need assistance during installation,
please contact your local dealer or the Heatilator Technical
Services Department, Hearth Technologies Inc., 1915 W.
Saunders St., Mt. Pleasant, Iowa 52641 (1-800-927-6841).
Heatilator® is a registered trademark of Hearth
Technologies Inc.
B. DESCRIPTION OF THE FIREPLACE SYSTEM
1. The Heatilator fireplace system consists of the
following:
a. Fireplace/Integral Grate/Outside Combustion Air
System
b. Refractory
c. Chimney Termination Cap
d. Chimney System
e. Hearth Extension
f. Glass Doors
The CP311 Convenience Pack has been designed for
the convenience of customers wishing to install a
chimney system at the 11 ft minimum straight height.
The CP313 Convenience Pack has been designed for
those wishing to install a chimney system at the 13 ft
minimum straight height.
The following combination of listed parts are included
in both the CP311 and CP313 Convenience Packs:
Manufactured Housing Convenience Packs
CP311
Cat. #
SL324 1 2 Chimney Section - 24 in. long
SL336 2 2 Chimney Section - 36 in. long
MH842 1 1 Roof Thimble and Flashing
TR344 1 1 Round Termination Cap
Qty.
CP313
Qty.
Description:
Note: Illustrations used throughout these instructions
reflect “typical installations” and are for design purposes
only. Actual installation may vary slightly due to individual
design preferences. However, minimum and maximum
clearances must be maintained at all times.
The illustrations and diagrams used throughout these
installation instructions are not drawn to scale.
2. Optional Components include:
a. Chimney Air Kit
b. Glass Doors
Figure 1 - Typical Fireplace System
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MH SERIES INSTALLATION INSTRUCTIONS
C. SYSTEM COMPONENTS
1. Fireplace Components
Catalog # Description:
MH36A MH39A MH42A Fireplace, includes Integral Grate, Hearth Protection Strips, and Outside Air Kit
HX3 HX3 HX4 Hearth Extension
DM1036 DM1039 DM1042 Original Bifold Glass Doors - Black Finish
DM1036B DM1039B DM1042B Original Bifold Glass Doors - Polished Brass Finish (included with fireplace)
DM1036S DM1039S DM1042S Original Bifold Glass Doors - Stainless Steel Finish
DP1036 none DP1042 Perception Glass Doors - Black Finish
DP1036B none DP1042B Perception Glass Doors - Polished Brass Finish
DP1036S none DP1042S Perception Glass Doors - Stainless Steel Finish
GR4 GR5 GR6 Integral Grate (included wi th fireplace)
FK18 Fan Kit with JK8 Junction Box (included with fireplace)
BC10 Blower Control
JK8 Junction Box Kit (included with fireplace)
Outside Air Kit (included with fireplace)
HEARTH EXTENSION
CAT. # A B
HX3 5 2 in. 16 in .
HX4 6 6 in. 20 in .
FAN KIT
FK18
INTEGRAL GRATE
(supplied)
GLASS DOORS
DM1036/DM1036B/DM1036S
DM1039/DM1039B/DM1039S
DM1042/DM1042B/DM1042S
BLOWER CONTROL
BC10
DP1036/DP1036B/DP1036S
DP1042/DP1042B/DP1042S
JUNCTION BOX
JK8
OUTSIDE AIR KIT
GR4, GR5, GR6
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Outside Air Kit
MH SERIES INSTALLATION INSTRUCTIONS
Cat # A B C D
MH36A 36 in. 41 in. 25-1/4 in. 12-5/8 in.
MH39A 39 in. 44 in. 28-1/4 in. 14-1/8 in.
MH42A 42 in. 47 in. 31-1/4 in. 15-5/8 in.
2. Chimney Components
The following pictures show only those chimney components which may be safely used with this fireplace.
Fireplace Dimensions
Catalog # Description:
CAK4A Chimney Air Kit
SL3 Chimne y Stabi lizer
SL306 Chimney Section - 6 in. long
SL312 Chimney Section - 12 in. long
SL318 Chimney Section - 18 in. long
SL324 Chimney Section - 24 in. long
SL336 Chimney Section - 36 in. long
SL348 Chimney Section - 48 in. long
SL315 Chimney Offset/Return - 15-deg
SL330 Chimney Offset/Return - 30-deg
JB877 Chimney Joint Band
CB876 Chimney Bracket
TR344 Round Termination Cap
CP311 Manufactured Housing Convenience Pack - 11 ft
CP313 Manufactured Housing Convenience Pack - 13 ft
MH841 Manufactured Housing 20 in. Thimble Extension
MH842 Manufactured Housing Thimble and Flashing
RF370 Roof Flashing - 6/12 to 12/12 Pitch
RF371 Roof Flashing - Flat to 6/12 Pitch
AS8 Attic Insulation Shield
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MH SERIES INSTALLATION INSTRUCTIONS
MH841
CAK4A
Chimney Air Kit
MH842 - Roof Thimble & Flashing
TR344
Round Termination Cap
with Storm Collar
CB876
Chimney Bracket
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JB877
Joint Band
Offset/Return
Chimney Sections
Catalog # A B
SL306 6 in. 4-3/4 in.
SL312 12 in. 10-3/4 in.
SL318 18 in. 16-3/4 in.
SL324 24 in. 22-3/4 in.
SL336 36 in. 34-3/4 in.
SL348 48 in. 46-3/4 in.
A = Actual Length
B = Effective length (length of
chimney part after it has
been snapped to another)
MH SERIES INSTALLATION INSTRUCTIONS
SL3 - Chimney Stabilizer
RF370 - Roof Flashing
Flat to 6/12 Pitch
AS8
Straight Attic
Insulation Shield
RF371 - Roof Flashing
6/12 to 12/12 Pitch
Firestop Spacer
Catalog # A B
FS338 0-deg. 14-1/2 in.
FS339 15-deg. 18-3/8 in.
FS340 30-deg. 23 in.
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MH SERIES INSTALLATION INSTRUCTIONS
D. PRE-INSTALLATION PREPARATION
1. Fireplace Locations and Space Requirements
Several options are available to you when choosing a location for your fireplace. This fireplace may be used as a
room divider, installed along a wall or across a corner. See Figure 2.
Locating the fireplace in a basement, near frequently opened doors, central heat outlets or returns, or other locations
of considerable air movement can affect the performance and cause intermittent smoke spillage from the front of the
fireplace. Consideration should be given to these factors before deciding on a location.
CLEARANCES!
A minimum 1/2 in. air clearance must
be maintained at the back and sides
of the fireplace assembly.
Chimney sections at any level require
a 2 in. minimum air space clearance
between the framing and chimney
section.
Figure 2 - Fireplace Locations
Figures 3 and 4 show two typical installations assuming an outside air kit is being used. Therefore, an allowance
must be made for 90-deg bends. Less space is required when ducting goes directly outside without forming
elbows.
Without Outside Air
With Outside Air
Figure 3
Installation Along a Wall
Cat. # A
MH36A 42 in.
MH39A 45 in.
MH42A 48 in.
These are rough framing
dimensions only.
Cat. # A
MH36A 42 in.
MH39A 45 in.
MH42A 48 in.
With Outside Air
Cat. # A B C D E
MH36A 42 in. 72-3/4 in. 36-3/8 in. 15-5/8 in. 51-3/8 in.
MH39A 45 in. 75-3/4 in. 37-7/8 in. 6-5/8 in. 53-1/2 in.
Figure 4 - Corner Installation
MH42A 48 in. 78-3/4 in. 9-3/8 in. 17-5/8 in. 55-3/8 in.
WARNING!
Do not draw outside air from garage spaces. Exhaust products of gasoline engines are hazardous.
Do not install outside air ducts such that the air may be drawn from attic spaces, basements or above the
roofing where other heating appliances or fans and chimneys exhaust or utilize air. These precautions will
reduce the possibility of fireplace smoking or air flow reversal.
To prevent contact with sagging or loose insulation, the fireplace must not be installed against vapor barriers
or exposed insulation. Localized overheating could occur and a fire could result.
08/04 17804 Rev i 9
WARNING!
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