TOA Electronics CST38MH User Manual

INSTALLATION INSTRUCTIONS MANUAL

Model CST38MH

36" Wood Burning Fireplaces

P/N 700,033M, REV. C, 12/2006

Retain These Instructions

For Future Reference

This installation manual will enable you to obtain a safe, efficient and dependable installation of your fireplace system. Please read and understand these instructions before beginning your

installation.

Do not alter or modify the fireplace or its components under any circumstances.Any modification or alteration of the fireplace system, including but not limited to the fireplace,chimneycomponentsandaccessories,mayvoidthewarranty,listings and approvals of this system and could result in an unsafe and potentially

dangerous installation.

Important! To assure proper alignment of glass doors: install this fireplace in a square and plumb condition, using shims as necessary at sides and/or

bottom.

Report No. 116-F-20-4

Table of contents
Safety Rules......................................	Page	2
Tools and Building Supplies...............	Page	2
Precautions.......................................	Page	2
Introduction.......................................	Page	3
Clearances/Height Requirements.......	Page	3
Chimney System................................	Page	3
Assembly Outline...............................	Page	4
Location of Fireplace..........................	Page	4
Assembly Steps.................................	Page	5
Preinstallation Notes..........................	Page	5
Clearances.........................................	Page	5
Installing the Fireplace.......................	Page	5
Fireplace and Framing Specifications Page		7
Framing Wall Variations.....................	Page	8
Combustion Air Kits...........................	Page	8
Installing the Chimney System..........	Page	9
Ten Foot Rule Summary....................	Page 13
Chimney Component Calculations.....	Page 13
Special Offset Instructions.................	Page 13
Offset Elevation Chart........................	Page 14
Vertical Elevation Chart .....................	Page 15
Offset Calculations.............................	Page 16
Installing Offsets................................	Page 16
30° Offset through Floor/Ceiling........	Page 17
Glass Doors.......................................	Page 17
Gas Line Installation..........................	Page 17
Cold Climate Insulation......................	Page 18
Fireplace Finishes..............................	Page 18
Mantels and Trim...............................	Page 18
Hearth Extensions/Wall Shields.........	Page 18
Finish Requirements..........................	Page 20
Accessories And Components...........	Page 20

PACKAGING LIST:

The assembled wood fireplace is packaged

with:

1 - One envelope containing the literature package which consists of the homeowner's manual, installation instructions, warranty and combustion air cover (located in the firebox).

2 - One Combustion Air Kit (90L83).

3 - Two Door Sets.

Important: Please read and understand these Rules to follow for safety.

SAFETY RULES:

WARNING

To avoid the risk of damaging fireplace materials and increasing the risk of fire, do not use the fireplace to cook or warm food.

1. Before starting your fireplace installation, read these installation instructions carefully to be sure you understand them completely and in entirety. Failure to follow them could cause a fireplace malfunction resulting in serious injury and/or property damage.

2. Always check your local building codes. The installation must comply with all local, regional, state and national codes and regulations.

3. These fireplaces must be installed with Security Chimneys FTF8 (8" inside diameter) Chimney System only. These systems are intended for use in any application where a traditional masonry type fireplace would apply. The chimney system must always vent to the outside of the building.

4. To ensure a safe fireplace system and to prevent the build-up of soot and creosote, inspect and clean the fireplace and chimney prior to use and periodically during the heating season.

5. Burn approved fuels only as defined in the Homeowner's Care and Operation Manual.

6. DO NOT use charcoal or coal under any circumstances.

7. NEVER use gasoline, gasoline-type lantern fuel, kerosene, charcoal lighter fluid, or similar liquids to start or “freshen up” a fire in this fireplace. Keep any flammable liquids a safe distance from the fireplace.

8. NEVER leave children unattended when there is a fire burning in the fireplace.

9. Always keep flue damper open when heat is present in the fireplace.

10.Before servicing, allow the fireplace to cool. Always shut off any electricity or gas to the fireplace while working on it. This will prevent any possible electrical shock or burns.

11.This fireplace is not intended to heat an entire home or be used as a primary heat source. It is designed to ensure homeowner comfort by providing supplemental heat to the room.

12.Always ensure that an adequate supply of replacement combustion air from the outside of the house is accessible to the fire to support normal combustion. Fireplaces consume large volumes of air during the normal combustion process.

•In the event the home is tightly sealed with modern energy efficient features, the combustion air kit (provided) may not provide all the air required to support combustion.

•The manufacturer is not responsible for any smoking or related problems that may result from the lack of adequate combustion air. It is the responsibility of the builder/contractor to ensure that adequate combustion air has been provided for the fireplace.

13.Alwaysensurethattheairinlettothefireplace is free from debris and any other obstructions that can block the entrance of air.

14.DO NOT use a fireplace insert or any other product not specified by the manufacturer of this LHP appliance for use with this fireplace. All gas log sets must be operated with the damper clamped open.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

WARNING

This fireplace has not been tested with an unvented gas log set. To reduce risk of fire or injury, do not install an unvented gas into this fireplace.

15. "Smoke free” operation is not warranteed nor are we responsible for inadequate system draft caused by mechanical systems, general construction conditions, inadequate chimney heights, adverse wind conditions and/or unusual environmental factors or conditions beyond our control.

16.Never, under any circumstances, install a fireplace, chimney component or any accessories, that has visible or suspected physical damage as a result of handling or transportation. These items should be inspected by your distributor or qualified factory representative to ensure safe condition. When in doubt, consult your distributor.

17.For additional safety considerations and complete operating instructions, refer to the Care and Operation Manual provided with the fireplace.

Tools and building supplies normally required

Tools	Supplies
Phillips screwdriver	Framing materials
Hammer	Wall finishing materials
Saw and/or sabersaw	Caulking materials
Level	(noncombustible)
Measuring tape	Fireplace surround and
Plumb line	hearth extension
Electric drill and bits	materials
Pliers	(noncombustible)
Square

Precautions

The most important areas of concern dealing with the installation of factory-built fireplaces are clearances to combustible materials, proper assembly of component parts, height of the chimney system, the proper use of accessories supplied by the manufacturer and the techniques employed in using finishing materials applied to the wall surrounding the fireplace, hearth extensions and wall shields. Each of these topics will be covered in thorough detail throughout this manual. Please give each your special attention as you progress with your installation.

Note: These fireplace systems are not difficult to install. However, in the interest of safety, it is recommended that the installer be a qualified or certified “tradesman” familiar with commonly accepted fireplace installation and safety techniques as well as prevailing local codes.

Introduction

General Information

The CST38MH Series is a radiant-heat, twosided fireplace with standard glass doors and an outside combustion air kit is provided.

A steel grate is also included to properly position the fire and limit the amount of fuel. IF A

REPLACEMENT GRATE IS NEEDED REPLACE THE GRATE WITH MODEL SGR-38B ONLY.

Note: Illustrations shown reflect “typical” installations with nominal dimensions and are for design and framing reference only. Actual installations may vary due to individual design preferences. However, always maintain minimum clearances to combustible materials and do not violate any specific installation requirements.

These fireplaces have been tested and listed by OMNI Test Labs (Report No. 116-F-20-4) to U.L. standard 127. These units are intended for installation in Manufactured Homes, residential homes and other buildings of conventional construction including commercial.

These fireplace systems are designed for installation in accordance with the National Fire Protection Standard for chimneys, fireplaces and solid fuel burning appliances; NFPA 211latest edition and in accordance with codes such as the BOCA Basic/National Codes, the Standard Mechanical Code and the Uniform

Building Codes.

Typical installation
Chimney and	Firestop
Termination
	Thimble
Outside Combustion Air Kit
Figure 1

WARNING

Failure to use manufacture provided parts, variations in techniques and construction materials or practices other than those described in this manual may create a fire hazard and void the limited warranty.

WARNING

Do not pack or fill required air spaces with insulation or other material. No material is allowed in these areas. Secure the airspace around the chimney with the firestop/thimble before completing the installation. Maintain 2" clearance between chimney and thimble.

WARNING

Ifinsulationisused,thefireplace must not be placed directly against it. Insulation or vapor barriers, if used, must first be covered with gypsum board, plywood, particle board or other material to assure insulation and vapor barriers remain in place.

When complete these fireplace systems consists of four basic “sub-systems”:

1.The Fireplace

2.The Chimney and Termination

3.Glass Doors

4.Combustion Air Kit

Clearances and height requirements

The fireplace may be placed on or near normal construction materials*. The combustion air kit, firestop spacer and roof flashing (not chase flashings) may be placed directly on or against normal construction materials.* The chimney and fireplace outer wrapper require a minimum 2"and1/2"airspacetocombustiblesrespectively. A combustible mantel may be installed 12" above the opening of the fireplace as per NFPA 211latest edition.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

The fireplace opening must be kept a minimum of 8" (203 mm) from a protected combustible side wall. A perpendicular side wall can not be closer that 18" (457 mm). If there is a continuous perpendicular side wall closer than 18" from the fireplace opening, it must be protected with a 40" x 40" x 1/2" (1016 mm x 1016 mm x 13 mm) wall shield constructed of a durable noncombustible material with an equal or greater insulating value than k=.84 BTU IN/FT2 HR °F (refer to Pages 18, 19 and 20).

As with all chimney installations, avoid overhead obstructions such as trees, power lines, etc. Additionally chimney terminations must meet certainclearancetoroofrequirementsdetailedin the paragraph titled Ten-Foot Rule Summary.

The fireplace and chimney system must be enclosed when installed in or passing through a living area where combustibles or people may come in contact with it. This is important to prevent possible personal injury or fire hazard.

For questions, please call your distributor or the manufacturer. Special restrictions apply to the front and facing of the fireplace and nearby walls (See Pages 18, 19 and 20).

Chimney system

These fireplaces are designed and code listed for use with Security Chimneys FTF8 chimney System only. Always use Security Chimneys FTF8chimneycomponentswiththesefireplaces. Do not modify or alter these components as this may cause a potential serious hazard and void the Warranty.

*Construction Materials:

• Framing Materials • Paneling

• Particle Board	• Flooring
• Dry Wall	• Plywood

•Noncombustible Insulating Materials

•Etc.

Chimney Height

The total height of your Fireplace systems from the surface the fireplace rests on to the chimney top must not exceed 80' (24.4m) and must also meet minimum system height chart.

Minimum System Height

Security's FTF8 Pipe

Vertical Installation	15' 0"
One Offsets	16' 0"
Two Offsets	25' 0"

Table 1

Insulate Joists
Same As Ceiling
Draft Stops
Firestop
CTDT
Termination
Note: Non-
Combustible
Chase
Flashing
Must Be
Used To
Cover
Chase
Opening
	Optional
	Insulation
	In Outside
	Walls Of
	Chase
8'
Level
Ground Level
Base Requirements
	Fireplace
	Solid
	Continuous
	Surface
	Base
Insulation	Front Face
(Thermal Barrier)	Model Shown
Figure 2

Chimney Enclosure

Construct a box-like framed structure to enclose the fireplace and chimney within the confines of the manufactured home, not necessarily above the roof line.

As with all chimney installations, avoid overhead obstructions such as trees, power lines, etc. The chimney/fireplace enclosure should be constructed and insulated just like any outside wall. In a cold climate, we recommend the base of the chimney/fireplace enclosure should also be insulated between the solid continuous floor beneath the fireplace and the chase bottom. Insulation in a cold climate installation is not required for safety.

Note: Local codes may not require firestopping at the ceiling levels for outside chimney enclosure installations. However, it is recommended for safety and the reduction of heat loss.

WARNING

Do not obstruct the collar openings around the base of the chimney at the top of the fireplace. Do not insulate the chase cavity with blown or fill type insulation materials.

Assembly outline

Before You Start

Check your inventory list to be sure you have all the necessary parts supplied in good usable condition. Check also for any concealed damage.

Check the operation of the damper. The damper is controlled through the use of a control lever located within the firebox opening at the top center just behind the firebox lintel (Figure 3). The control lever snaps into place at the extreme range of motion, up and back in the closed position. When pulled forward and down, the damper is open.

damper	damper
closed	open
lintel
Figure 3

Location of fireplace

Carefully select the proper location for heat circulation, aesthetics, chimney obstructions and clearance to side wall(s). With proper preplanning, a slight adjustment of a few inches can save considerable time and expense later during construction and assembly.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Figure 4

WARNING

This fireplace and chimney system is not approved for use in a bedroom or any room used for sleeping.

Carefully consider the position of the fireplace opening with respect to the location of adjacent or nearby stairwells, bath or kitchen exhaust fans and/or return air registers for forced air furnaces/air conditioners that could cause a smoking fireplace condition if the house is tightly insulated.

When locating the fireplace, consideration must be given to combustibles and final finishing. For an example of this, see Figure 5 and confine the final location of combustible finish materials to the "Safe Zone".

DO NOT permanently place furniture or other items such as decorative pillows within 60" of the fireplace front face.

		Black Portion Of Frame
		Not To Be Covered With
		Combustible Materials
		Wall
11-3/8”		Covering
30°
		1”
	Door
	Opening
	18”	Safe
		Zone
Figure 5 - Clearances

Assembly Steps

Note: The following steps represent the normal sequence of installation. Each installation is unique, however, and might require a different sequence.

1.Position firebox prior to framing or into prepared framing.

2.Install the chimney system.

3.Install outside combustion air kit.

4.Plumb gas line if a decorative gas appliance will be used. (Gas connections should only be performed by an experienced, licensed/ certified tradesman).

5.Install both “All-GlassTM” door assemblies.

6.Complete finish wall material, surround and

hearth extension to your individual taste. 7. Inststall the glass doors provided.

Study the three dimensional illustration (Figure 1) to get a general idea of each element of your fireplace system.

Pre-installation notes

The fireplace may be installed directly on a combustible floor or raised on a platform of an appropriate height. Do not place fireplace on carpeting, vinyl or other soft floor coverings. It may, however, be placed on flat wood, plywood, particle board or other hard surfaces. Be sure fireplace rests on a solid continuous floor or platform with appropriate framing for support and so that no cold air can enter the room from under the fireplace.

The fireplace may be positioned and then the framing built around it, or the framing may be constructed and the fireplace positioned into the opening.

Usually, no special floor support is needed for the fireplace, however, to be certain:

1. Estimate the total weight of the fireplace system including chimney and surround materials such as brick, stone, etc., to be installed. Shipping weights for the fireplace may be found on Page 7.

2. Measure the square footage of the floor space to be occupied by the system, surrounds and hearth extensions.

3. Note the floor construction, i.e. 2 x 6’s, 2 x 8’s or 2 x 10’s, single or double joists, type and thickness of floor boards.

4. Use this information and consult your local building code to determine if you need additional support.

CAUTION

Do not block the heat-circulating air inlet and outlet ports. Doing so may result in a potential fire hazard.

CAUTION

The structural integrity of the manufactured home floor, wall, ceiling and roof must be maintained.

The firestop thimble supplied with the unit must be used on a manufactured home installation. The firestop thimble must extend completely though the roof cavity to the outermost plane of the roof (See Figures 21, 22 and 23).

Maintain 1" clearance between the thimble and the chimney.

If you plan to raise the fireplace and hearth extension, build the platform assembly then position fireplace and hearth extension on top. Secure the platform to the floor to prevent possible shifting.

Clearances

Minimum clearance to combustibles for the appliance is as follows: sides - 1/2" (12.5 mm), floor - 0" (0 mm), adjacent wall - 18" (457 mm), ceiling - 37-1/2" (953 mm).

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Installing the fireplace

Step 1. Slide the fireplace into prepared framing or position fireplace in its final position

and frame later.

The fireplace may not be recessed into a combustible floor. Maintain the floor to hearth clearance established by the fireplace lower front face.

Step 2. Insert the provided metal safety strips, beneath the fireplace as illustrated (Figures 6 and 7). The safety strips should overlap 1/2" for continual coverage of the floor.

Note: Safety strips are not required when fireplace rests on a noncombustible surface.

hearth	metal safety	hearth
extension		extension
	strips
floor		floor
Figure 6

hearth	metal safety	hearth
extension	strips	extension
	Platform	floor
Figure 7

Note: Install the hearth extension only as illustrated.

Platform

metal

safety strips

" min.

(51 mm)

Figure 8

*
metal
safety strips	* " min.
*	(51 mm)
Figure 9

The safety strips should extend in front and sides of the fireplace opening 2" (51 mm) . In the event a wooden support is used to elevate the fireplace above the floor, a “Z” type safety strip should be fabricated and used to protect the front surface of the wood support as well as the floor beneath the hearth extension (see Figures 8 and 9). The safety strips should be tacked down to prevent possible movement.

Note: The “Z” type safety strip is not supplied.

Step 3. Refer to fireplace drawings and specifications on Pages 7 and 8 for framing dimensions and details. False header may be positioned directly on top of the fireplace spacers (see Figures 10, 11 and 12).

IMPORTANT

Under no circumstances can the fireplace top spacers (Figure 13) be removed or modified, nor may you notch the header to fit around or be installed lower than the spacers. The header may be in direct contact with the top spacers but may not be supported by them.

4 x 6 header

x 4 false

header

spacer

Figure 10

If the appliance is to be elevated above floor level, a solid continuous platform must be constructed.

The header may rest on the top metal spacers, but must not be notched to fit around them.

Consult all local codes.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

no combustible materials in shaded areas

Figure 11

no

combustible

materials in

shaded areas

Figure 12

fireplace specifications

	Product Reference Information
	Cat.	Model	Ship.	Ship.			Outside (combustion) Air Kit
	No.		Weight	Volume	4 x 4		Required in Manufactured Home Installations
	H4629	CST38MH	237 lb.	29.6 cu. ft.			Right Side of
					header
							Fireplace
					x 4
					false header		FOAK-6 Outside
			Notes		(optional)		Air Kit (provided
	Due to Lennox' ongoing commitment to quality,
	all specifications, ratings and dimensions are
	subject to change without notice.
	Allframingdimensionscalculatedfor1/2"drywall					4 ³⁄ "
	at the fireplace face. If sheathing the chase or
	finishing with other thickness materials, calcula-					(1086 mm)
						49"
	tions will need to be made.
						(1 45 mm)
	See Page 8 for Ceiling and Roof Framing
					7" min.
	Dimensions
					(178 mm)		3 ¹ ⁄ "
	Diagrams & Illustrations Not to Scale
					40	¹⁄ "	(608 mm)

(10 mm)

OTL Report No. 116-F-20-4
25-3/16"	23-15/16"	49"
(640 mm)	(608 mm)		4 ³⁄ "
8"		(1 45 mm)
(203 mm)			(1086 mm)
39-1/4"
(997 mm)		End View	Front View
Top View
12-1/2"		12-1/2"
(318 mm)		(318 mm)

	10-1/2"
	(267 mm)
	5-1/4"
	(133 mm)			48-3/4"
48-3/4"				(1238 mm)
(1238 mm)	32"	42-1/2"	Outside (combustion)
	(813 mm)
		(1080 mm)	Air Inlet
	21"
	(533 mm)			3-7/8"
				(98 mm)
	5-3/4"		8-13/16"	8-9/16"
	(146 mm)		(224 mm)	(217 mm)
	38" (965 mm)
	39-1/4" (997 mm)			End View
	Front View
Figure 13

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Framing wall variations

As many as six (6) different framed wall configurations can be constructed to enclose the Fireplaces. The following illustrations depict these variations of wall enclosures. Several of these designs may incorporate book shelves, wood storage boxes, etc.

CST38MH - Wall Types

“C” Type Wall

“T” Type Wall

“L” Type Wall

“H” Type Wall

“Y” Type Wall

Parallel Wall

Figure 14

		b
	a
ceiling framing
Framing Dimensions for Ceiling
Framing Dimensions for Ceiling
Inches (millimeters)
Flue Type	A	B
FTF8, Vertical	16 1/2"	16 1/2"
at 2" (51 mm)	(419 mm)	(419 mm)
FTF8 Offset 30°	16 1/2"	27"
At 2" (51 mm)	(419 mm)	(686 mm)
Figure 15

	d	c
		roof framing
	Framing Dimensions for Roof
		Inches
	Pitch	FTF8 at 1" (USA)
		C	D*
	0/12	16 1/2"	16 1/2"
	6/12	16 1/2"	19"
	12/12	16 1/2"	23 1/2"
	* Perpendicular to roof ridge
	Figure 16

Step 4. The fireplace should be secured to side framing members using nailing tabs. Use 8d nails (Figure 17).

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

nailing

flange

framing

stud

Figure 17

Note: The nailing tabs are exempt from the fireplace clearances described on the fireplace clearance label.

Install the Combustion Air Kit

(required in Manufactured Home installations)

Outside air drawn into the fireplace supplies air to the fire for combustion. The outside air

kit (FOAK-6, Cat. No. 90L83) must be installed before the fireplace is framed and enclosed in the finished walls.

Install the air intake Collar (provided) as shown in Figure 18.

There is a one-hand operated shut-off valve located in the enclosed corner of the fireplace opening behind the screen. Refer to label for directions of operation. The combustion air damper should be fully open when the fireplace is in operation and fully closed when the fireplace is not in use to prevent outside air from entering your home.

Connect the 6” (152 mm) Class 0 or Class 1 air duct to the outside air collar on the appliance with the tie strip in the outside air kit (provided). See Figure 18.

Route the Class 0 or Class 1 air duct out the back or side wall, up through the ceiling or floor joists to an outside wall. The air duct should be located above snow level.

Outside combustion air may be run upwards or vertically through framing and ceiling joists, with the hood installed through an outside wall and 3' (914 mm) below the termination. Ducting may also be run downward through floor joists and under the home to a ventilated crawlspace not considered part of the living area of the home.