Heatilator ST42A User manual

1Heatilator • ST42A Installation Manual • 4012-051 • Rev O • 02/22
WOODBURNING FIREPLACE
Fire Risk.
WARNING
For use with solid wood fuel only.


Model(s):
Installation Manual
Installation and Fireplace Setup
WARNING
HOT SURFACES!


Hot glass will cause burns.
• DO NOT
 
 
       

 

materials.
       
materials away.
INSTALLER: Leave this manual with party responsible for use and operation.
OWNER: Retain this manual for future reference.
ST42A
NOTICE: DO NOT discard this manual!
• DO NOT-


• DO NOT
warranty.
 -


WARNING: If the information in these

or explosion may result causing property
damage, personal injury, or death.
Installationand s of thisshouldperformedy

2 Heatilator • ST42A Installation Manual • 4012-051 • Rev O • 02/22
Safety Alert Key:
• DANGER! will result in death or serious injury.
• WARNING! result in death or serious injury.
• CAUTION! 
• NOTICE:
Table of Contents
 
 
 
 
2 Getting Started
 
 
 
 
C. Tools and Supplies Needed 8
 
 
3 Framing and Clearances
 
 
 
 
 
 
  
 
4 Chimney and Termination Requirements
 
 
 
5 Chimney Installation
 
 
 
 
 
  
G. Roof Penetration 22
 
  
  
6 Shrouds
 
 
 
 
7 Finishing
 
 

 
  
 
 
 
 
8 Fireplace Setup
 
9 Reference Materials
 
 





Heatilator • ST42A Installation Manual • 4012-051 • Rev O • 02/22
Customer:
Lot/Address
Model (circle one): 
YES IF NO, WHY?
WARNING! Risk of Fire or Explosion! Failure to install fireplace acording to these instructions can lead to a fire or
explosion.







Firestops installed.
ATTENTION INSTALLER:
Follow this Standard Work Checklist
his installation
manual.
Date Installed:
Location of Fireplace:
Installer:
Dealer/Distributor Phone #
Serial #:

Termination installed.

Fireplace Install

Chimney

Shrouds Section 6 (Pg. 25)

Fi i hi
S ti 7 (P 27)




Optional doors properly installed.

Grate is properly installed.



Comments:





Finishing Section 7 (Pg. 27)

Fireplace Setup Section 8 (Pg. 34)



 Heatilator • ST42A Installation Manual • 4012-051 • Rev O • 02/22
WARNING! Risk of Fire! Hearth & Home Technologies
disclaims any responsibility for, and the warranty and
agency listing will be voided by the following actions.
DO NOT:
 
 
• install other than as instructed by Hearth & Home
Technologies
• operate the fireplace without fully assembling all
components
 
• install any component not approved by Hearth & Home
Technologies
• install parts or components not Listed or approved
Improper installation, adjustment, alteration, service or
maintenance can cause injury or property damage. For
      
installer, service agency or your dealer.
B. Non-Combustible Materials
    

- Steel - Iron
   
   
- Glass - Plasters
 ASTM E 136, Standard
Test Method for Behavior of Metals, in a Vertical Tube
Furnace at 750° C
C. Combustible Materials
 

   
   
   
 

1 

WARNING: This product and the fuels
used to operate this product (wood and
wood pellets), and the products of combus-
tion of such fuels, can expose you to chemi-
cals including carbon black, which is known
to the State of California to cause cancer
and carbon monoxide, which is known to
the State of California to cause birth defects
or other reproductive harm. For more infor-
mation go to: www.P65Warnings.ca.gov.
         
       
          


 -
       -
          


        

-
-
        
United States and Canada.

Heatilator • ST42A Installation Manual • 4012-051 • Rev O • 02/22
2 Getting Started
A. Typical Fireplace System
Figure 2.1 Typical Fireplace System
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
))
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
Non-combustible
roof flashing maintains
minimum clearance
around chimney
Additional lateral
support for chimney
above roof (or enclosed
in chase) if needed
Ceiling firestop
on floor of attic
Support straps
on rafter support
chimney (not shown)
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
Chimney system
Attic insulation shield (not shown)
must be used here to keep
insulation away from chimney
if attic is insulated
Storm Collar
Chimney Air Kit
Required in
Canada. Outlet
must be no
less than 4 ft.
(1.322 m) off
ground level.

 Heatilator • ST42A Installation Manual • 4012-051 • Rev O • 02/22
1/2 in. (13 mm)
all configurations
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 2.2 Fireplace Locations
NOTICE:
 
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.
NOTICE: In addition to these framing dimensions, also
reference the following section:
• Clearances (Section 3).
NOTICE:
A minimum 1/2 in. air clearance at the back and
-
tained.
Chimney sections at any level require a 2 in. mini-
mum air space clearance between the framing
and chimney sections.
B. Design and Installation Considerations
NOTICE: Check building codes prior to installation.
 

 


• Before installing
 
 
 
 
 
 

1. Selecting Fireplace Locations

2.2.





-
     
-



Heatilator • ST42A Installation Manual • 4012-051 • Rev O • 02/22
 
-

 


 
 

       

 
 

 

Marginal Location:
 

 
 




 

 


 
 

 
 
 
 
Marginal Location:
 
Figure 2.3 Recommended Chimney Locations
 

      all 

 

 

 
 
 
taped or sealed.

8 Heatilator • ST42A Installation Manual • 4012-051 • Rev O • 02/22
C. Tools and Supplies Needed


 
 
 
 
 
 
Level Tape measure


D. Inspect Fireplace and Components
WARNING! Risk of Fire and/or Explosion! Damaged
parts could impair safe operation. DO NOT install dam-
-
place dry.
 

        

 
• Read all the instructions before starting the
installation. Follow these instructions carefully
during the installation to ensure maximum safety

E. Fireplace System Requirements


 
 
 
 
 
• Outside Air System
 
 
• Chimney System
 
 
 
 

Heatilator • ST42A Installation Manual • 4012-051 • Rev O • 02/22
3 Framing and Clearances
A. Appliance Dimensions/Weight
Gas
Knockout
Outside
Air
58-7/8 in.
(1496 mm)
(effective height)
38-3/8 in.
(975 mm)
11-3/4 in.
(298 mm)
8-5/8 in.
(219 mm)
13 in.
[330 mm]
dia.
42 in.
(1067 mm)
23 in.
(585 mm)
7-1/2 in.
(192 mm)
39-1/8 in.
(995 mm)
Gas
Knockout
8-3/8 in.
(213 mm)
14 in.
(356 mm)
8-3/8 in.
(213 mm)
14 in.
(356 mm)
47 in.
(1194 mm)
28 in.
(711 mm)
23-1/2 in.
(597 mm)
14 in.
(356 mm)
5-7/8 in.
(149 mm)
Figure 3.1 Appliance Dimensions
Model Pounds
 
Appliance Weight Table


 Heatilator • ST42A Installation Manual • 4012-051 • Rev O • 02/22
B. Clearances
WARNING! Risk of Fire!
You must comply with all minimum air space clearances
DO NOT pack
required air spaces with insulation or other materials.
          

be constructed entirely of non-combustible materials (i.e.,
steel studs, concrete board, etc.). Failure to comply may

Minimum Clearances to Combustibles
WITHIN ENCLOSURE AREA
 
 
 
MANTEL
 

 
Figure 3.2 Clearances to Combustible Materials
(roof)
(insulation)
0 in. to level
of standoffs
Attic
Insulation
Shield
(ceiling)
(attic)
(ceiling)
Offset/Return (secured
with hanger straps)
Storm Collar
Roof Flashing
1/2 in. (13 mm) to
sides of appliance
Must have 2 in. (51 mm)
minimum clearance
to header
0 in.
to floor
2 in. (51 mm) min.
Shaded areas
represent
2 in. (51 mm) min.
air space clearance
required around pipe
Combustible Object
Adapter
Ceiling Firestop
48 in.
1219 mm
Note:  
   
     
Canada.