INSTALLATION & OPERATING INSTRUCTIONS MHC36 MHR36 WOODBURNING FIREPLACE FOR MANUFACTURED HOUSING Note: An arrow ( ) found in the text signifies change in content. WARNING! Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information, consult a qualified installer, service agency or the gas supplier.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS TABLE OF CONTENTS Safety Precautions ....................................................................................................................................... 2 Design and Installation Considerations ........................................................................................................ 3 A. Listings and Code Approvals .....................................................................................................................
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS DESIGN AND INSTALLATION CONSIDERATIONS When selecting a location for your woodburning fireplace, it is important to evaluate a number of considerations. Modern construction techniques can create conditions that may not allow your chimney to draft properly. This may result in smoke spillage from your fireplace, as well as cause other combustion appliances to operate incorrectly. Tightly sealed construction is important for energy efficiency.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS A. LISTINGS AND CODE APPROVALS This fireplace system has been tested and listed in accordance with UL 127 standards, and has been listed by Underwriters Laboratories Inc. for installation and operation in the United States. This fireplace has been tested and listed for use with the optional components listed on page 5. These optional components may be purchased separately and installed at a later date.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS C. SYSTEM COMPONENTS 1.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS Fireplace Dimensions 2. Chimney Components The following pictures show only those chimney components which may be safely used with this fireplace. Catalog # SL306 Chimney Section - 6 in. long SL312 Chimney Section - 12 in. long SL318 Chimney Section - 18 in. long SL324 Chimney Section - 24 in. long SL336 Chimney Section - 36 in. long SL348 Chimney Section - 48 in.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS MH841 Chimney Sections Catalog # A B SL306 6 in. 4-3/4 in. SL312 12 in. 10-3/4 in. SL318 18 in. 16-3/4 in. SL324 24 in. 22-3/4 in. SL336 36 in. 34-3/4 in. SL348 48 in. 46-3/4 in. A = Actual Length B = Effective length (length of chimney part after it has been snapped to another) MH842-Roof Thimble & Flashing Firestop Spacer Catalog # A B FS338 0-deg. 14-1/2 in. FS339 15-deg. 18-3/8 in. FS340 30-deg. 23 in.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS D. PRE-INSTALLATION PREPARATION 1. Fireplace Locations and Space Requirements Several options are available to you when choosing a location for your fireplace. This fireplace may be used as a room divider, installed along a wall or across a corner. See Figure 2.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS Figures 3 and 4 show two typical installations assuming an outside air kit is being used. Therefore, an allowance must be made for 90-deg bends. Less space is required when ducting goes directly outside without forming elbows. These are rough framing dimensions only. Figure 3 Installation Along a Wall Figure 4 Corner Installation WARNING! Do not draw outside air from garage spaces. Exhaust products of gasoline engines are hazardous.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS 2. Frame the Fireplace The MHR36 and MHC36 fireplaces will fit a framed opening of 39-5/8 in. wide x 33-5/8 in. tall. The finished cavity depth must be no less than 19-3/4 in. Figure 5 shows a typical framing (using 2 x 4 lumber) of the fireplace, assuming combustible materials are used. All required clearances to combustibles around the fireplace must be adhered to. Chimney sections at any level require a 2 in.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS 3. Sidewalls/Surrounds Adjacent combustible side walls must be located a minimum of 12 in. from the fireplace opening. See Figure 6. If you are using a decorative surround constructed of combustible material, it must be located within the shaded area defined in Figure 6. Short stub walls are also acceptable if they are contained within the shaded area. Figure 6 - Sidewalls and Surrounds E.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS 1. Using Offsets and Returns a. To bypass any overhead obstructions, the chimney may be offset using a 15-deg (SL315) or 30-deg (SL330) offset/return. Perform the following steps to determine the correct chimney component combination for your particular installation. b. An offset and return may be attached together or a chimney section(s) may be used between an offset and return.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS 2. Chimney Height Requirements (above roof line) a. Major building codes specify a minimum chimney height above the roof top. These specifications are summarized in what is known as the Ten Foot Rule.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS F. FIREPLACE INSTALLATION WARNING! Before starting, do the following: 1. Wear gloves and safety glasses for protection. 2. Keep hand tools in good condition. Sharpen cutting edges and make sure tool handles are secure. 3. Always maintain the minimum air space required to the enclosure to prevent fire. 1. Position the Fireplace This fireplace may be placed on either a combustible or noncombustible continuous flat surface.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS 4. Assemble Chimney Sections Attach either a straight chimney section or an offset to the top of the fireplace (depending on your installation requirement). Chimney sections are locked together by pushing downward until the top section meets the stop bead on the lower section. The inner flue is placed to the inside of the flue section below it. The outer casing is placed outside the outer casing of the chimney section below it. See Figure 10.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS 6. Attic Insulation Shield 8. Secure the Chimney System An insulation shield should be installed when there is a possibility of insulation coming into contact with the factory built chimney system. The insulation shield is installed by positioning it over the vertical chimney section where it penetrates a firestop spacer. The firestop spacer will support the insulation shield. See Figure 12.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS 9. MH842 Ceiling/Roof Thimble See Figures 14 and 15. a. Locate the point where the chimney will exit the roof by plumbing down to the center of the chimney. Lay out, cut and frame a 14-1/2 in. square opening (measured on the horizontal) through the ceiling and roof structure. See Chapter 25 of the Uniform Building Code for roof framing details. b. The thimble must extend completely through the roof structure shielding combustible materials.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS WARNING! WARNING! Do not pack insulation in spaces between the two shields or above the shield inside the flashing. This may affect temperatures to adjacent combustibles. See page 13 for minimum chimney height above roof. This fireplace has not been tested for use with a chase above the roof. To reduce the risk of fire, do not install a chase above the roof.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS 12. Complete the Enclosure Complete the fireplace enclosure, allowing space for outside air ducts and gas piping if desired. Electrical wiring should not come in contact with the fireplace. A minimum clearance of 1 in. must be maintained between the fireplace sides and the enclosure (except at the nailing flange) as well as the fireplace back and the enclosure. See pages 9-11 for framing details.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS 14. Hearth Extension A hearth extension must be installed with all fireplaces to protect the combustible floor in front of the fireplace from both radiant heat and sparks. The construction of, and materials used for a hearth extension are shown in Figures 19 and 20. A hearth extension of this construction may be covered with any noncombustible decorative material and may have a maximum thickness as per the illustration.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS 15. Position the Hearth Extension Position and secure the hearth extension over the protective metal strips that have been placed partially under the fireplace front. These strips should be protruding approximately 2 in. from under the fireplace front and 2 in. on both sides of the fireplace opening. Seal the crack between the hearth extension and fireplace with a bead of noncombustible sealant. See Figure 21.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS G. OPERATING INSTRUCTIONS Note: Save and pass this instruction manual to subsequent home owners. The information provided is intended to notify and warn them about making unsafe future modifications such as the addition of shelves or the use of unauthorized parts and repairs. 1. General Information 2. Outside Air This fireplace is intended to operate as a supplemental heat source for a single room.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS 4. Glass Doors 7. Wood Fuel Most efficient fireplace operation using glass doors is with the doors open. When the doors are open, the screen must be closed. Only Hearth & Home Technologies glass doors may be used. See Figure 22 for proper glass door operation. FIREWOOD: Your fireplace performance depends on the quality of the firewood you use.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS SEASONING: Seasoned firewood is nothing more than wood that is cut to size, split and air dried to a moisture content of around 20%. The time it takes to season wood varies from around nine months for soft woods to as long as eighteen months for hardwoods. The key to seasoning wood is to be sure it has been split, exposing the wet interior and increasing the surface area of each piece.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS Flue draft is measured as negative pressure in the chimney. The amount of negative pressure determines how strong the draft is. The draft is important because it draws the combustion air into the fireplace and pulls the smoke out of the chimney. There are three basic criteria essential in establishing and maintaining flue draft: • • • Availability of combustion air. Heat generated from the fire. Diameter and height of the flue system.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS H. MAINTENANCE INSTRUCTIONS 1. Disposal of Ashes Ashes should be placed in a metal container with a tight-fitting lid. The closed container of ashes should be placed on a noncombustible floor or on the ground, well away from all combustible materials, pending final disposal. If the ashes are disposed of by burial in soil or otherwise locally dispersed, they should be retained in the closed container until all embers have thoroughly cooled.
MHC36 AND MHR36 INSTALLATION INSTRUCTIONS INDEX A P Air Clearance 16, 19 Air Kit 7, 18 Air Kit Handle Location 18 Ashes, Disposal of 26 Attic Insulation Shield 16 Firewood 22, 23 Flashing 17 Flue 22 Framing 10 Fuel 22, 23 B G Building Codes 4, 13, 17, 21 Gas Codes 19, 22 Gas Knockout Location 6 Gas Log/Lighter Provisions 19 General Information 22 Glass Doors 5, 21, 23 Grate 5, 23 C Chimney Checking the Assembly 16 Cleaning 26 Creosote 26 Height Requirements 13 Requirements 11 Securing the System 16
HEATILATOR WOODBURNING FIREPLACE Limited Warranty As part of its 20-YEAR BUYER PROTECTION PROGRAM AS PART OF ITS 20 YEAR BUYER PROTECTION PROGRAM (“PROGRAM”), HEARTH & HOME TECHNOLOGIES INC. (“HHT”) is pleased to offer a Limited Warranty and a Replacement Parts Advantage covering specific components of your Heatilator woodburning fireplace system ( the “Fireplace”), installed in the United States of America or Canada.
