Heat & Glo HST38, HST-38ND INSTALLATION & OPERATING INSTRUCTIONS
INSTALLATION & OPERATING
INSTRUCTIONS
HST38, HST-38ND
WOODBURNING FIREPLACE
Note: An arrow () found in the text signifies change in content.
WARNING!
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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HST-38 SERIES INSTALLATION INSTRUCTIONS
TABLE OF CONTENTS
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 ......................................................................................................................................... 10
E. Chimney Requirements ............................................................................................................................................... 12
F. Installation of Fireplace ................................................................................................................................................ 15
G. Constructing a Chase .................................................................................................................................................. 23
H. Operating Instructions ................................................................................................................................................. 26
I. Maintenance Instructions ............................................................................................................................................. 30
Index ............................................................................................................................................................................ 31
Warranty ...................................................................................................................................................................... 32
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 fireplace 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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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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HST-38 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 and Canada
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.
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 Heat-N-Glo Technical Services
Department, Hearth & Home Technologies Inc.,
1-888-427-3973.
Heat-N-Glo® is a registered trademark of Hearth & Home
Technologies Inc.
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.
B. DESCRIPTION OF THE FIREPLACE SYSTEM
1. The Heat-N-Glo 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
2. Optional Components Include:
a. Glass Doors
b. Chimney Air Kit
c. Fan Kit
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.
Figure 1 - Typical Fireplace System
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HST-38 SERIES INSTALLATION INSTRUCTIONS
C. SYSTEM COMPONENTS
1. Fireplace Components
Catalog # Description:
HST-38 Fireplace with Integral Grate, Outside Air Ki t and Hearth Protecti on Strips
AK-225 Outside Air Kit (included with Fireplace)
GDA-175BK Cabinet Style Glass Doors - Black Finish
GDA-175PB Cabinet Style Glass Doors - Polished Brass Finish
HX3 Hearth Extension
GR17 Integral Grate (included with Fireplace)
TK53B1 Trim Kit - Polished Brass
FK-200 Fan Kit
GDA Series
Cabinet Style Glass Doors
GR17
Integral Grate
TK53B1
Trim Kit
HX3
Hearth Extension
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HST-38 SERIES INSTALLATION INSTRUCTIONS
Fireplace Dimensions
AK-225 - Outside Air Kit
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2. Chimney Components
The following pictures show only those chimney components which may be safely used with this fireplace.
Catalog # Description:
CAK4A Chimney Air Kit
ID 4 Insula ted D uc t/Outside Air
UD4 Uninsulated Duct/Outside Air
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
SL3 Chimney Stabilizer
SL315 Chimney Offset/Return - 15-degree
SL330 Chimney Offset/Return - 30-degree
FS338
FS339 Firestop - 15-degree
FS340 Firestop - 30-degree
AS8 SL300 Straight Attic Insulation Shield, 24 in.
JB877 Chimney Joint Band
CB876 Chimney Bracket
RF370 Roof Flashing - Flat to 6/12 Pitch
RF371 Roof Flashing - 6/12 to 12/12 Pitch
TR344 Round Termination Cap
TR342 Round Telescoping Termination Cap
ST375 Square Termination Cap
TS345 Square Termination Cap
TS345P Square Termination Cap - Painted
TCT375 Terra Cotta Termination Cap
CT35 Chase Top
LDS33 Decorative Shroud - 3 ft x 3 ft
LDS46 Decorative Shroud - 4 ft x 6 ft
Firestop - Straight
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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)
HST-38 SERIES INSTALLATION INSTRUCTIONS
SL3 - Chimney Stabilizer
Offset/Return
Firestop Spacer
Catalog # A B
FS338 0-deg. 14-1/2 in.
FS339 15-deg. 18-3/8 in.
FS340 30-deg. 23 in.
CB876
Chimney Bracket
JB877
Joint Band
RF370 - Roof Flashing
Flat to 6/12 Pitch
RF371 - Roof Flashing
6/12 to 12/12 Pitch
AS8
Straight Attic
Insulation Shield
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HST-38 SERIES INSTALLATION INSTRUCTIONS
LDS33 (3 ft x 3 ft)
LDS46 (4 ft x 6 ft )
Decorative Shroud
ST375
Square Termination Cap
TR344
Round Termina-
tion Cap
TS345/TS345P
Square Termination Cap
TR342
Round Telescoping
Termination Cap
TCT375
Terra Cotta Cap
CT35
Chase Top
CAK4A
Chimney Air Kit
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HST-38 SERIES INSTALLATION INSTRUCTIONS
D. PRE-INSTALLATION PREPARATION
1. Fireplace Locations and Space Requirements
It is important to note that certain see-through fireplace installations are more susceptible to smoke spillage than
others. Rooms of greatly unequal air volumes that are separated by a see-through fireplace, rooms with cathedral
ceilings and rooms connected by long passageways will create conditions where unequal air pressures will cause a
see-through fireplace to vent improperly. Glass doors may have to be operated in the closed position to minimize
smoke spillage. The fireplace may be located as shown in Figure 2, depending on your fireplace. This fireplace may
be used as a room divider or installed along a wall.
CLEARANCES!
A minimum 1/2 in. air
clearance must be
maintained at the sides of the
fireplace assembly.
Chimney sections at any level
require a 2 in. minimum air
space clearance between the
framing and chimney section.
These are
rough
framing
dimen-
sions only.
Figure 2 - Fireplace Locations
Figure 2 shows the minimum distance to combustible surfaces for side walls and for walls facing the fireplace openings,
as well as minimum hearth extension dimensions.
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.
WARNING!
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.
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