Hearth and Home Technologies HST-48D owner manual Design and Installation Considerations, Draft

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B. Design and Installation Considerations

NOTICE: 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 over restrictions, installation inspection and permits.

Before installing, determine the following:

•Where the fireplace is to be installed

•The vent system configuration to be used

•Gas supply piping

•Electrical wiring

•Framing and finishing details

•Whether optional accessories—devices such as a fan, wall switch or remote control—are desired

NOTICE: Junction box should be installed during initial setup to avoid major reconstruction.

C. Draft

Draft is the pressure difference needed to vent fireplaces successfully. When a fireplace is drafting successfully, all combustion byproducts are exiting the home through the chimney.

Considerations for successful draft include:

•Preventing negative pressure

•Location of fireplace and chimney

NOTICE: Hearth & Home Technologies assumes no responsibility for the improper performance of the fireplace system caused by:

•Inadequate draft due to environmental conditions

•Downdrafts

•Tight sealing construction of the structure

•Mechanical exhausting devices

•Improper location of the chimney

D. Negative Pressure

WARNING! Risk of Asphyxiation! Negative pressure can cause spillage of combustion fumes and soot. Fire must draft properly for safe operation.

Negative pressure results from the imbalance of air avail- able for the fireplace to operate properly. It can be stron- gest in lower levels of the house.

Causes 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 such as:

-Recessed lighting

-Attic hatch

-Duct leaks

To minimize the effects of negative air pressure:

•Install the outside air kit with the intake facing prevailing winds during the heating season

•Ensure adequate outdoor air for all 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

NOTICE: Hearth & Home Technologies Inc. recommends the use of direct vent fireplaces in basements.

Heat & Glo • HST-48D US-CAN • 4012-040 • Rev F • 11/08

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Contents Fire Risk Wood Burning FireplaceOperation Hot screen/mesh and glass doors will cause burnsListing Label Information/Location GrateNumber Table of Contents Installer GuideUser Guide CONDITIONS, Exclusions & Limitation of Liability Warranty Hearth & Home Technologies Limited WarrantyHeat & Glo HST-48D US-CAN 4012-040 Rev F 11/08 Combustible Materials Listing and Code ApprovalsAppliance Certification Non-Combustible MaterialsOperating Instructions Your FireplaceHot glass will cause burns Firescreen Seasoned WoodStarting a Fire GrateClear Space Glass DoorsVented Gas Log Sets & Gas Log Lighters Optional ComponentsHardwood vs Softwood Wood FuelMaintainance and Service Chimney Inspection/CleaningDisposal of Ashes Frequency As desired Glass Cleaning Check Firebox Refractory Inspect GrateStart Fire Problems Possible Cause Solution Troubleshooting GuideTypical Fireplace System Getting StartedDesign and Installation Considerations DraftNegative Pressure Frequently open doors Central heat outlets or returns Locating Fireplace & ChimneyTools and Supplies Needed Fireplace System RequirementsInspect Fireplace and Components Framing & Clearances Select Fireplace Location1676 mm Hearth Clearances to Combustible Materials ClearancesFrame the Fireplace Sidewalls/SurroundsPlace Protective Metal Hearth Strips Installation of FireplaceThings to Consider Position the FireplaceYES Ft min. from top of uppermost chimney section to air inletInstall Outside Air Kit Hood Wire TiesOutside Air Maintain minimum height of chimney above roof Chimney AssemblyC,f Chimney RequirementsExample Using Offsets/ReturnsAssemble Chimney Sections Install Chimney Air KitInstalling the Ceiling Firestop Install Ceiling Firestops330 mm Install Attic Insulation ShieldComplete Installation Install FlashingCut out Hole in Roof Flat Roofs Chimney Termination RequirementsConstruct the Chase Chase InstallationsCaulk all seams to prevent leaks Refer to Figure Install Fireplace & ChimneyInstall Chase Top Install as per Sections 7ST1175/ST475 Square Termination Cap Install Termination CapTCT1175 Terra Cotta Cap Installing a TCT1175 Terra Cotta CapShrouds Radiation ShieldField Constructed Shrouds Mailbox Style Shroud radiation shield required Finishing Hearth Extension= 1/k x inches of thickness Finishing Material High temperature sealantCombustible Mantel Fireplace opening 1194 mm Width of fireplace 305 mmGas Code, Ansi Z223.1 AccessoriesGas Log/Lighter Provision Wood Burning InsertsRev F 11/08 Fireplace DimensionsReference Materials Heat & Glo HST-48D US-CAN1676 mm 508 mm 13 mm Inside Diameter Chimney ComponentsCatalog # 457 mm51 mm 25-1/439-7/8 711 mm 14-3/4 375 mm 584 mm HST-48D Service PartsDo not Discard this Manual
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