Heatilator ST42A User manual

Heatilator • ST42A • 35038 Rev G • 02/05 1
Owner’s Manual
Installation and Operation
Model:
ST42A
See-Through
Woodburning Fireplace
DO NOT DISCARD THIS MANUAL
CAUTION
• Important operating
and maintenance
instructions included.
• Leave this manual with
party responsible for
use and operation.
• Read, understand
and follow these
instructions for safe
installation and
operation.
DO NOT
DISCARD
Installation and service of this fireplace should
be performed by qualified personnel. Hearth
& Home Technologies suggests NFI certified
or factory-trained professionals, or technicians
supervised by an NFI certified
professional.
HOT! DO NOT TOUCH.
SEVERE BURNS MAY RESULT.
CLOTHING IGNITION MAY RESULT.
WARNING
• Keep children away.
• CAREFULLY SUPERVISE children in same room
as fireplace.
• Alert children and adults to hazards of high
temperatures.
• Keep clothing, furniture, draperies and other
combustibles away.
Glass and other surfaces are hot
during operation and cool down.
If the information in these instruc-
tions is not followed exactly, a
fire may result causing property
damage, personal injury, or death.
• Do not store or use gasoline or other flam-
mable vapors and liquids in the vicinity of
this or any other appliance.
• Do not overfire. Overfiring will void your
warranty.
• Comply with all minimum clearances to
combustibles as specified. Failure to
comply may cause house fire.
WARNING
Fire Risk
• For use with solid wood fuel or decorative
gas appliance only.
• Do not install unvented gas logs.
WARNING

Heatilator • ST42A • 35038 Rev G • 02/05
2
Read this manual before installing or operating this fireplace.
Please retain this owner’s manual for future reference.
Congratulations on selecting a Heatilator wood burning fire-
place. The Heatilator fireplace you have selected is designed
to provide the utmost in safety, reliability and efficiency.
As the owner of a new fireplace, you’ll want to read and care-
fully follow all of the instructions contained in this owner’s
manual. Pay special attention to all cautions and warnings.
This owner’s manual should be retained for future reference.
We suggest you keep it with your other important documents
and product manuals.
The information contained in this owner’s manual unless noted
otherwise, applies to all models and gas control systems.
Your new Heatilator wood burning fireplace will give you years
of durable use and trouble-free enjoyment. Welcome to the
Heatilator family of fireplace products!
Homeowner Reference Information
Model Name: Date purchased/installed:
Serial Number: Location on fireplace:
Dealership purchased from: Dealer phone:
Notes:
We recommend that you record the following pertinent
information about your fireplace:
Listing Label Information/Location
The model information regarding your specific fireplace can be found on the rating plate located on the smoke shield of the
fireplace.
Congratulations!
FIREPLACE NO.
MODEL NO.
MODEL NO.
MFG. DATE
WARNING: RISK OF
FIRE DAMAGE. REPLACE
GRATE WITH HEARTH & HOME
TECHNOLOGIES INC.
FIRECHAMBER INTENDED FOR USE WITH HEARTH & HOME TECHNOLOGIES INC. LISTED FIREPLACE PARTS. SEE INSTALLATION AND
OPERATING INSTRUCTIONS FOR THIS MODEL. ONLY HEARTH & HOME TECHNOLOGIES INC. GLASS DOOR KITS CAN BE INSTALLED ON THIS UNIT.
FIREPLACE ALSO FOR USE
IN MANUFACTURED HOMES
YES NO
CLEARANCE TO
COMBUSTIBLES:
CHIMNEY
2 IN. MIN.
FIREBOX
IN.
MIN.
FAN KIT
MODEL NO.
&RATED AT
115 VOLTS, 50/60 Hz., AMP.
DO NOT OVERFIRE. USE ONLY: SOLID WOOD FUEL OR
LISTED DECORATIVE GAS APPLIANCE. DO NOT USE A
FIREPLACE INSERT OR OTHER PRODUCTS NOT
SPECIFIED FOR USE WITH THIS PRODUCT. IF DOORS
ARE USED OPERATE FIREPLACE WITH DOORS FULLY
OPEN OR CLOSED ONLY. WHEN BURNING A
DECORATIVE GAS APPLIANCE IN THE FIREPLACE,
ADJUST DAMPER TO THE FULLY OPEN POSITION.
WARNING! THIS FIREPLACE HAS NOT BEEN TESTED WITH AN UNVENTED
GAS LOG SET. TO REDUCE THE RISK OF FIRE OR INJURY, DO NOT
INSTALL AN UNVENTED GAS LOG SET INTO FIREPLACE.
WARNING! THIS APPLIANCE IS NOT FOR USE AS COOKING EQUIPMENT.
IF INSTALLATION OR OPERATING INSTRUCTIONS ARE MISSING
CONTACT: HEARTH & HOME TECHNOLOGIES INC.,
1915 W. SAUNDERS ST., MT. PLEASANT, IA 52641.
Grate Fireplace
Model
Serial
Number

Heatilator • ST42A • 35038 Rev G • 02/05 3
Table of Contents
1 Listing and Code Approvals
A. Appliance Certification. . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Getting Started
A. Design and Installation Considerations . . . . . . . . . . . . 5
B. Negative Pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
C. Typical Fireplace System . . . . . . . . . . . . . . . . . . . . . . 7
D. Tools and Supplies Needed. . . . . . . . . . . . . . . . . . . . . 8
E. Inspect Fireplace and Components. . . . . . . . . . . . . . . 8
3 Framing and Clearances
A. Selecting Fireplace Location . . . . . . . . . . . . . . . . . . . . 9
B. Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
C. Sidewalls/Surrounds . . . . . . . . . . . . . . . . . . . . . . . . . 11
D. Frame the Fireplace . . . . . . . . . . . . . . . . . . . . . . . . . 11
E. Construct the Chase . . . . . . . . . . . . . . . . . . . . . . . . . 12
F. Chimney Requirements. . . . . . . . . . . . . . . . . . . . . . . 12
4 Installation of Fireplace
A. Install the Outside Air Kit . . . . . . . . . . . . . . . . . . . . . . 13
B. Secure the Fireplace . . . . . . . . . . . . . . . . . . . . . . . . . 14
5 Chimney Assembly
A. Chimney Requirements. . . . . . . . . . . . . . . . . . . . . . . 16
B. Using Offsets/Returns . . . . . . . . . . . . . . . . . . . . . . . . 17
C. Assemble the Chimney Sections. . . . . . . . . . . . . . . . 18
D. Install the Firestop Spacers. . . . . . . . . . . . . . . . . . . . 18
E. Install the Attic Insulation Shield . . . . . . . . . . . . . . . . 19
F. Double-check the Chimney Assembly. . . . . . . . . . . . 19
G. Secure the Chimney . . . . . . . . . . . . . . . . . . . . . . . . . 19
6 Complete the Enclosure
A. Chimney Termination. . . . . . . . . . . . . . . . . . . . . . . . . 20
B. Chase Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
C. Install the Termination Cap . . . . . . . . . . . . . . . . . . . . 22
7 Accessories
A. Gas Log/Lighter Provisions . . . . . . . . . . . . . . . . . . . . 23
8 Finishing
A. Hearth Extension. . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
B. Finishing Material . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
C. Mantel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
D. Sidewalls/Surrounds . . . . . . . . . . . . . . . . . . . . . . . . . 25
E. Glass Doors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
9 Operating Instructions
A. General Information. . . . . . . . . . . . . . . . . . . . . . . . . . 26
B. Outside Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
C. Clear Space Near the Fireplace . . . . . . . . . . . . . . . . 27
D. Flue Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
E. Firescreen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
F. Glass Doors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
G. Grate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
H. Wood Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
I. Starting a Fire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10 Troubleshooting
A. Understanding Vent Problems. . . . . . . . . . . . . . . . . . 30
B. Diagnostics and Problem Solving . . . . . . . . . . . . . . . 31
11 Maintenance and Servicing the Fireplace
A. Disposal of Ashes . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
B. Chimney Inspection/Cleaning . . . . . . . . . . . . . . . . . . 33
C. Firebox Refractory. . . . . . . . . . . . . . . . . . . . . . . . . . . 33
D. Maintenance Task List . . . . . . . . . . . . . . . . . . . . . . . . 34
E. Chimney Fire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
12 Reference Materials
A. Fireplace Dimensions . . . . . . . . . . . . . . . . . . . . . . . . 35
B. Fireplace Components . . . . . . . . . . . . . . . . . . . . . . . 36
C. Chimney Components. . . . . . . . . . . . . . . . . . . . . . . . 37
Woodburning Termination Cap . . . . . . . . . . . . . . . . . 40
D. Service Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
E. Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
F. Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Note: An arrow () found in the text signifies change in content.

Heatilator • ST42A • 35038 Rev G • 02/05
4
1
1 Listing and Code Approvals
A. Appliance Certification
This fireplace system has been tested and listed in accor-
dance with UL 127 standards by Underwriters Laboratories
Inc. for installation and operation in the United States and
Canada.
This fireplace has been tested and listed for use with the op-
tional components specified in this manual. These optional
components may be purchased separately and installed at
a later date. Installation of an outside air kit will require sig-
nificant reconstruction and is best if installed at the time of
fireplace installation.
Heatilator is a registered trademark of Hearth & Home Tech-
nologies Inc.
Not intended for use as a primary heat source.
This fireplace is tested and approved as a decorative fire-
place. It should not be factored as a primary heat source
in residential heating calculations.
Improper installation, adjustment, alteration, service
or maintenance can cause injury or property damage.
Refer to the owner’s information manual provided with
this fireplace. For assistance or additional information
consult a qualified installer, service agency or your
dealer.
WARNING
Fire Risk
• Do not install or operate damaged fireplace.
• Do not modify fireplace.
• Installation other than as instructed by Hearth & Home
Technologies Inc. is strictly prohibited.
• Do not operate the fireplace without fully assembling
all components.
• Do not overfire.
•Do not install an unvented gas log set. This fireplace
has not been tested for use with unvented gas log
sets.
• Installation and/or use of any component part not
approved by Hearth & Home Technologies.
Hearth & Home Technologies disclaims any responsibility
for, and the warranty and agency listing will be voided by
the above actions.
WARNING

Heatilator • ST42A • 35038 Rev G • 02/05 5
2
Getting Started
A. Design and Installation Considerations
Draft is the pressure difference needed to vent fireplaces
successfully. Considerations for successful draft include:
• Preventing negative pressure
• Location of fireplace and chimney
B. Negative Pressure
Negative pressure results from the imbalance of air avail-
able for the fireplace to operate properly. Causes for this
imbalance include:
• Exhaust fans (kitchen, bath, etc.).
• Range hoods.
• Combustion air requirements for furnaces, water heaters
and other combustion appliances.
• Clothes dryers.
• Location of return-air vents to furnace or air
conditioning.
• Imbalances of the HVAC air handling system.
• Upper level air leaks: recessed lighting, attic hatch
opening, duct leaks.
To minimize the effects of negative air pressure, the follow-
ing must be considered:
• Install the outside air kit. Install the intake on the side of
the house towards prevailing winds during the heating
season.
• Ensure adequate outdoor air is supplied for combustion
appliances and exhaust equipment.
• Ensure furnace and air conditioning return vents are not
located in the immediate vicinity of the fireplace.
• Avoid installing the fireplace near doors, walkways or small
isolated spaces.
• Recessed lighting should be a “sealed can” design; attic
hatches weather stripped or sealed; attic mounted duct
work and air handler joints and seams taped or sealed.
• Basement installations should be avoided due to stack
effect. Stack effect creates negative pressure in lower
levels. Hearth & Home Technologies recommends the
use of direct vent fireplaces in basements.
Asphyxiation Risk
Negative pressure can cause spillage of
combustion fumes and soot. Fire needs to draft
properly for safe operation.
WARNING
Check building codes prior to installation.
• Installation MUST comply with local, regional,
state and national codes and regulations.
• Consult insurance carrier, local building inspector,
fire officials or authorities having jurisdiction about
restrictions, installation inspection and permits.
CAUTION
When planning a fireplace installation, it is necessary to de-
termine the following information before installing:
• Where the fireplace is to be installed. See Sections
3 and 4.
• The vent system configuration to be used. See Sections
5 and 6.
• Gas supply piping. See Section 7.
• Framing and finishing details. See Sections 3 and 8.
• Whether optional accessories are desired. See
Section 12.

Heatilator • ST42A • 35038 Rev G • 02/05
6
Location of the fireplace and chimney will affect performance.
As shown in Figure 2.1 the chimney should:
• Be installed through the warm airspace enclosed by the
building envelope. This helps to produce more draft,
especially during lighting and die-down of the fire.
• Penetrate the highest part of the roof. This minimizes the
effects of wind turbulence.
• Be located away from trees, adjacent structures, uneven
roof lines and other obstructions.
Offsets can restrict draft so their use should be minimized.
Consider the fireplace location relative to floor and ceiling
and attic joists.
Recommended
Location
Marginal
Location
Location
Not
Recommended
Recommended
Location
Multi-level Roofs
Windward
Leeward
Outside Air Intake
Location
Not
Recommended
Figure 2.1 Recommended Chimney Locations

Heatilator • ST42A • 35038 Rev G • 02/05 7
C. Typical Fireplace System
The Heatilator fireplace system consists of the following:
• Fireplace/integral grate/refractory/outside air system
• Chimney termination cap
• Chimney system
• Hearth extension
Termination cap
Chimney penetrates roof
preferably without affecting
roof rafters
Offset/Return (with hanger straps)
Framing headed off
in ceiling joists
Enclosed space above
and around fireplace
Mantel and surround
Decorative facing
and trim
Hearth extension
Factory-built fireplace
Protective metal
hearth strip(s)
Outside
combustion air
Combustible
framing/header
on top of
V-shaped
standoffs
(spacers)
Chimney system
Firestop spacer
on floor of attic
Support straps
on rafter supports
chimney (not shown)
Non-combustible
roof flashing maintains
minimum clearance
around chimney
Additional lateral
support for chimney
above roof (or enclosed
in chase) if needed
Attic insulation shield may
be used here to keep insulation
away from chimney
Storm Collar
Figure 2.2 Typical Fireplace System
Optional components include:
• Glass doors
• Chimney air kit
• Fan kit (circulating fireplaces only)
• Junction box (circulating fireplaces only)

Heatilator • ST42A • 35038 Rev G • 02/05
8
Before beginning the installation be sure the following tools
and building supplies are available:
Reciprocating saw Framing material
Pliers High temp caulking material
Hammer Gloves
Phillips screwdriver Framing square
Flat blade screwdriver Electric drill and bits
Plumb line Safety glasses
Level Tape measure
1/2-3/4 in. length, #6 or #8 self-drilling screws
Misc. screws and nails
• Keep fireplace dry.
• Mold or rust may cause odors.
CAUTION
E. Inspect Fireplace and Components
• Carefully remove the fireplace and components from the
packaging.
• The vent system components and doors are shipped in
separate packages.
• Report to your dealer any parts damaged in shipment.
• Read all the instructions before starting the installation.
Follow these instructions carefully during the
installation to ensure maximum safety and benefit.
Fire Risk
Explosion Risk
Inspect fireplace and components for
damage. Damaged parts may impair safe
operation.
• Do NOT install damaged components.
• Do NOT install incomplete components.
• Do NOT install substitute components
Report damaged parts to dealer.
WARNING
D. Tools and Supplies Needed

Heatilator • ST42A • 35038 Rev G • 02/05 9
3
Framing and Clearances
A. Selecting Fireplace Location
Several options are available to you when choosing a loca-
tion for your fireplace. This fireplace may be used as a room
divider, installed along a wall, across a corner or used in an
exterior chase. See Figure 3.1.
66 in.
(1676 mm)
42 in.
(1067 mm)
20 in. (508 mm)
(hearth
extension)
64 in.
(1626 mm)
12 in. (305 mm)
min. to
perpendicular
wall.
Figure 3.1 Fireplace Locations
Fire Risk
Provide adequate clearances.
• Around air openings
• To combustibles
• For service access.
Locate fireplace away from traffic areas.
WARNING Note:
• Illustrations and photos reflect typical installations
and are FOR DESIGN PURPOSES ONLY.
•Illustrations/diagrams are not drawn to scale.
•Actual installation/appearance may vary due to
individual design preference.
• Hearth & Home Technologies reserves the right to
alter its products.
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 fire-
place. Consideration should be given to these factors before
deciding on a location. See Sections 2 and 10.
Note: 1/2 in. (13 mm) min. dis-
tance from fireplace to
combustible materials.
Note: In addition to these fram-
ing dimensions, also
reference the following
sections:
• Clearances (Sec-
tion 3.B.)
• Mantel Projections
(Section 8.C.)
• Fireplace Dimensions
(Section 12.A.)


Heatilator • ST42A • 35038 Rev G • 02/05
10
B. Clearances
2 in. (51 mm) min.
0 in. to level
of standoffs
Attic
Insulation
Shield
Firestop Spacer
(ceiling)
(roof)
(attic)
(ceiling)
Firestop Spacer Offset/Return with
hanger straps
Storm Collar
Roof Flashing
1/2 in. (13 mm) to side of appliance
2 in. (51 mm) min.
2 in. min.
(51 mm)
Must have 2 in. (51 mm)
minimum clearance
to header
0 in.
to floor
2 in. (51 mm) min.
2 in. (51 mm) min. 2 in. (51 mm) min.
2 in. (51 mm) min.
Figure 3.2 Clearances to Combustible Materials
Fire Risk
• Comply with all minimum clearances to
combustibles as specified.
Failure to comply may cause fire.
WARNING