Table of Contents

1Listing and Code Approvals

A. Appliance Certiﬁ cation. . . . . . . . . . . . . . . . . . . . . . . . . 4

2Getting 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

3Framing 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

4Installation of Fireplace

A. Install the Outside Air Kit . . . . . . . . . . . . . . . . . . . . . . 13 B. Secure the Fireplace . . . . . . . . . . . . . . . . . . . . . . . . . 14

5Chimney 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

6Complete the Enclosure

A. Chimney Termination. . . . . . . . . . . . . . . . . . . . . . . . . 20

B. Chase Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

C. Install the Termination Cap . . . . . . . . . . . . . . . . . . . . 22

7Accessories

A. Gas Log/Lighter Provisions . . . . . . . . . . . . . . . . . . . . 23

8Finishing

A. Hearth Extension. . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

B. Finishing Material . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

C. Mantel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

D. Sidewalls/Surrounds . . . . . . . . . . . . . . . . . . . . . . . . . 25

E. Glass Doors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

9Operating 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 signiﬁ es change in content.

Heatilator • ST42A • 35038 Rev G • 02/05

ST42A specifications

Hearth and Home Technologies ST42A is a highly regarded product in the realm of home heating, known for its excellent combination of functionality, efficiency, and aesthetic appeal. This stylish gas fireplace offers the perfect blend of modern design and superior technology, making it an ideal choice for homeowners seeking both comfort and elegance.

One of the main features of the ST42A is its remarkable heating capacity. With a BTU output ranging from 26,000 to 36,000, it efficiently warms spaces, making it suitable for medium to large living areas. This gas fireplace is designed to deliver heat effectively while maximizing energy efficiency, allowing users to enjoy warmth without incurring excessive energy costs.

The ST42A comes equipped with an advanced electronic ignition system, ensuring reliable startup and operation. This system not only adds convenience but also enhances safety, as it minimizes the risk of gas leaks. The fireplace is designed to operate on natural gas or propane, offering flexibility to homeowners based on their fuel availability and preferences.

In terms of design, the ST42A boasts a contemporary look that fits seamlessly into a variety of interior styles. Its large viewing area, framed by a stylish surround, allows for an impressive flame presentation that serves as a focal point in any room. The variable flame height adjustment feature allows users to customize the ambiance and comfort level, further enhancing the overall experience.

One of the standout technologies in the ST42A is its unique heat distribution system. This feature ensures that warmth is circulated throughout the room, rather than being concentrated in one area, promoting an even temperature distribution. Additionally, the fireplace is equipped with optional blower kits that can enhance air circulation, further improving the efficiency of heat delivery.

Maintenance is another significant consideration with any heating appliance, and the ST42A simplifies this with accessible components and easy cleaning features. The ceramic glass front is designed to resist soot buildup, ensuring a clear view of the flames and reducing the need for frequent upkeep.

Overall, the Hearth and Home Technologies ST42A stands out as a premium choice for those looking to add warmth and style to their home. With its powerful heating capabilities, advanced technologies, and elegant design, it represents an investment in both comfort and aesthetic enhancement for any living space.

Hearth and Home Technologies ST42A owner manual Table of Contents

Models: ST42A

ST42A specifications