Operation Guidelines

As wood is burned in the fireplace, room air entering the fireplace through vents is circulated around the firebox of the fireplace. This air circulation protects the firebox from overheating. Fireplace vents must not be blocked or restricted in any manner. Blocking or restricting air circulation through the fireplace can cause a fire hazard.

In residential type installation, an AK4 outside combustion air kit may be connected to either the left or right side of the fireplace to allow outside air to enter the firebox through a dampered opening in that side of the fireplace. This “outside combustion air” feature reduces the room air used for combustion and prevents excessive heat loss from the room. When the fireplace is in use, the fireplace’s “outside combustion air” damper connected to an AK4 may be opened to allow air from outside to enter the fireplace firebox. When the fireplace is not in use, the “outside combustion air” damper should be closed to prevent cold air from entering the firebox. An “outside combustion air” damper is open when its control lever is up, and closed when its control lever is down. A control lever for each “outside combustion air” damper is located inside the firebox near the top of the side firebrick on each side of the fireplace. The design of the fireplace allows the routing of the combustion air duct downward or horizontally to obtain the outside combustion air; this permits flexibility in planning your installation. See Figures 24 thru 27 and their instructions for typical installation of outside combustion air kits. Review the precautions and recommendations in this manual pertaining to outside combustion air. Outside air for combustion is optional in residential type installations unless required by local codes; it is mandatory in manufactured home installations. Use an AK6 outside combustion air kit in manufactured home installations, instead of the AK4 offered for residential type installations.

Glass doors (model MGD36B or MGD36PB by Monessen Hearth Systems) may be installed to receive the maximum benefit from your fireplace. For large fires, the maximum heating benefit from the fireplace will be obtained with the doors open due to the high amount of radiant heat being emitted out of the front opening of the fireplace. With a small fire, or before retiring in the evenings, it is best to operate the fireplace with the doors closed to prevent excessive room air from being drawn up the chimney. When the doors are open, the mesh screens should be closed to help keep burning embers from popping out of the firebox.

Glass doors are mandatory on fireplaces installed in manufactured homes.

WARNING: Fireplaces equipped with glass doors should be operated only with the glass doors fully open or fully closed. If doors are left partly open, gas and flame may be drawn out of the fireplace opening, creating risks of both fire and smoke.

The fireplace also is equipped with a flue damper, which must be open when the fireplace is in use. The flue damper control lever is located inside the fireplace. The counterweighted damper is operated by simply pushing up to open or pulling down to close the damper. When the fireplace is not in use, the damper should be closed to prevent cold air form entering the chimney as well as preventing warm air in the room from escaping up the chimney. NOTE: It is normal for a small amount of smoke to be released from the upper portion of the fireplace the first few times you use your new Monessen Hearth Systems fireplace. This results from an oil residue on the metal. Open a door or window to allow the smoke to escape.

The grate included with this fireplace helps to appropriately locate and contain the burning wood. Failure to use this grate may cause overheating of parts of the fireplace and allow large pieces of burning wood to roll forward out of the firebox. If the grate becomes warped or damaged, it must only be replaced by a Monessen Hearth Systems 078355 grate.

All fireplace chimneys are in direct contact with cold air on the exterior of the structure. Consequently, when the fireplace is not in use, cold air can fall down the chimney of the fireplace to cool off the fireplace chase. Therefore, the fireplace chase must be insulated to minimize the risk of cold air infiltration to the home. Even if the fireplace chase is adequately insulated, this cannot completely ensure that cold air infiltration into the structure will be eliminated. Cold air infiltration is a possibility with any fireplace or device that freely communicates with the air on the outside of the structure. Today’s homes are more energy-efficient and, therefore, better insulated and tightly constructed. Unfortunately, when air is removed from the house, as by a bathroom fan, or consumed by a furnace, additional air is needed to replace the air consumed. Unless the additional air is

53D9033. Rev 1 03/03

SWB400I specifications

The Monessen Hearth SWB400I is a versatile and efficient gas fireplace insert designed to enhance the aesthetic appeal and comfort of any home. It is an ideal solution for homeowners looking to upgrade their existing wood fireplace or transform an unutilized hearth into a modern, functional heating source.

One of the key features of the SWB400I is its impressive heating capacity. This insert can produce up to 40,000 BTUs, effectively warming areas of approximately 1,500 square feet. This makes it a powerful option for larger living spaces, ensuring consistent comfort during the colder months. The unit is equipped with a patented dual burner system that provides a realistic flame presentation while maximizing efficiency. Its efficient design means that users can enjoy a warm ambiance without worrying about excessive fuel consumption.

The Monessen SWB400I also boasts an advanced electronic ignition system, ensuring reliable starts every time. This technology eliminates the need for cumbersome matches or lighter fluid, making it user-friendly. In addition, the fireplace insert includes a built-in thermostat control, allowing homeowners to maintain the desired temperature with ease.

Another notable characteristic of the SWB400I is its customizable aesthetic options. Homeowners can choose from a variety of decorative fronts, including traditional and contemporary styles, to seamlessly integrate the insert into their home’s decor. The unit also features multiple media options, such as logs or contemporary glass pebbles, providing a personalized touch to the fireplace’s appearance.

Safety is a top priority with the SWB400I. It is equipped with a safety pilot system that automatically shuts off the gas supply in case of an emergency, ensuring peace of mind for users. Additionally, the fireplace insert comes with a removable safety screen that prevents accidental contact with the hot glass surface.

In summary, the Monessen Hearth SWB400I is a powerful, stylish, and efficient gas fireplace insert that combines innovative technology with customizable features. Its ability to produce significant heat, easy-to-use ignition system, and various aesthetic options make it a desirable addition to any home. Whether you're looking to increase your home's warmth or enhance its visual appeal, the SWB400I is an excellent choice for homeowners seeking quality and performance.