Heatilator ST42A Owner'S Manual Download Page 27

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Heatilator • ST42A US-CAN • 4012-039 Rev D • 11/07

Finishing

A. Hearth Extension

A hearth extension must be installed with all

replaces to

protect the combustible

oor in front of the

replace from

both radiant heat and sparks. See Figures 8.1 -8.3.

2 in. (51 mm)
required

High temperature
(300°F min.) continuous,
non-combustible sealant

Tile, stone or other
non-combustible material

Floor constructed of wood or
other combustible material

HX3 or HX4
Hearth Ext
or equivalent
insulation
(see Table below)

Fireplace

Protective
Metal Hearth
Strip

Figure 8.1 Hearth Extension Construction

This

replace has been tested and approved for use with a

hearth extension insulated to a minimum R value of 1.03.

To substitute materials for the factory-available hearth ex-
tensions, see Figure 8.3 and calculate insulation alternatives
as per Table 8.1 and the following formulas:

• Thermal conductivity per inch thickness =

• k = (BTU)(inch) / (foot

)(hour)(°F)

• Required thickness = Rk

• Thermal resistance per inch thickness =

• r = (foot

)(hour)(°F) / (BTU)(inch)

• Required thickness = R / rB.

Fire Risk

• Metal hearth strips MUST be installed.
Sparks or embers may ignite

ooring.

WARNING

Table 8.1

Hearth Extension Insulation Alternatives-Total minimum R Value must equal 1.03

Material

k per inch

thick

r per inch

thick

Minimum

thickness

required

Hearth & Home HX3, HX4 (Micore 300™)

0.49

2.06

1/2 in.

USG Micore 160™

0.39

2.54

1/2 in.

USG Durock™ Cement Board

1.92

0.52

2 in.

Cement Mortor

5.0

0.20

5-1/8 in.

Common Brick

5.0

0.20

5-1/8 in.

Ceramic Tile

12.50

0.08

12-1/4 in.

Armstrong™ Privacy Guard Plus

0.46

2.18

1/2 in.

Marble

14.3-20.0

0.07-0.05

14-5/8 in. - 20-3/8 in.

Summary of Contents for ST42A

Page 1: ... result causing property damage personal injury or death Do not store or use gasoline or other flam mable vapors and liquids in the vicinity of this or any other appliance Do not overfire Overfiring will void your warranty Comply with all minimum clearances to combustibles as specified Failure to comply may cause house fire WARNING Fire Risk For use with solid wood fuel or decorative gas appliance...

Page 2: ...Information Location The model information regarding your specific fireplace can be found on the rating plate located on the smoke shield of the fireplace Congratulations FIREPLACE NO MODEL NO MODEL NO MFG DATE WARNING RISK OF FIRE DAMAGE REPLACE GRATE WITH HEARTH HOME TECHNOLOGIES INC FIRECHAMBER INTENDED FOR USE WITH HEARTH HOME TECHNOLOGIES INC LISTED FIREPLACE PARTS SEE INSTALLATION AND OPERAT...

Page 3: ... Assembly 21 G Secure the Chimney 21 6 Complete the Enclosure A Chimney Termination 22 B Chase Top 24 C Install the Termination Cap 24 7 Accessories A Gas Log Lighter Provisions 26 8 Finishing A Hearth Extension 27 B Finishing Material 28 C Mantel 29 D Sidewalls Surrounds 29 E Glass Doors 29 9 Operating Instructions A General Information 30 B Outside Air 31 C Clear Space Near the Fireplace 31 D Fl...

Page 4: ...as a decorative fire place It should not be factored as a primary heat source in residential heating calculations Improper installation adjustment alteration service or maintenance can cause injury or property damage Refer to the owner s information manual provided with this fireplace For assistance or additional information consult a qualified installer service agency or your dealer WARNING Fire ...

Page 5: ... 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 due to stack effect Stack effect creates negative pressure in...

Page 6: ...etrate the highest part of the roof This minimizes the effects of wind turbulence Be located away from trees adjacent structures uneven roof lines and other obstructions Offsets can restrict draft so their use should be minimized Consider the fireplace location relative to floor and ceiling and attic joists Recommended Location Marginal Location Location Not Recommended Recommended Location Multi ...

Page 7: ...and trim Hearth extension Factory built fireplace Protective metal hearth strip s Outside combustion air Combustible framing header on top of V shaped standoffs spacers Chimney system SLA10 not shown Ceiling firestop on floor of attic Support straps on rafter supports chimney not shown Non combustible roof flashing maintains minimum clearance around chimney Additional lateral support for chimney a...

Page 8: ...rs CAUTION E Inspect Fireplace and Components Carefully remove the fireplace and components from the packaging The vent system components and doors are shipped in separate packages Report to your dealer any parts damaged in shipment Read all the instructions before starting the installation Follow these instructions carefully during the installation to ensure maximum safety and benefit Fire Risk E...

Page 9: ...lect typical installations and are FOR DESIGN PURPOSES ONLY Illustrations diagrams are not drawn to scale Actual installation appearance may vary due to individual design preference Hearth Home Technologies reserves the right to alter its products Locating the fireplace in a basement near frequently opened doors central heat outlets or returns or other locations of considerable air movement can af...

Page 10: ...learance to header 0 in to floor 2 in 51 mm min 2 in 51 mm min 2 in 51 mm min 2 in 51 mm min Figure 3 2 Clearances to Combustible Materials Fire Risk Comply with all minimum clearances to combustibles as specified Framing or finishing material used on the front of or in front of the appliance closer than the minimums listed must be constructed entirely of noncombustible materials i e steel studs c...

Page 11: ... of the fireplace assuming combustible materials are used All re quired clearances to combustibles around the fireplace must be adhered to See Figure 3 2 Any framing across the top of the fireplace must be above the level of the top standoffs 50 deg 37 deg Brick Front 48 in 1219 mm framing 42 in 1067 mm opening 9 3 4 in 248 mm 14 3 8 in 365 mm 12 in 305 mm 4 in 102 mm Flush Front 12 in 305 mm Figu...

Page 12: ...ulation Insulation Ceilng Firestop Metal Chase Top Round Termination Cap False Ceiling Figure 3 5 Chase Assembly F Chimney Requirements When planning your fireplace location the chimney con struction and necessary clearances must be considered The fireplace system and chimney components have been tested to provide flexibility in construction Vertical distances are measured from the base of the fir...

Page 13: ...llations the air duct may need to be run vertically In such an instal lation a 3 ft 914 m height difference must be maintained from the top of the uppermost chimney section to the outside combustion air inlet See Figure 4 2 See Figure 4 3 for proper placement of outside air inlet The outside air kit is installed on the left hand side of the fireplace See Figure 4 4 for handle location operation Ri...

Page 14: ... materials specified by manufacturer preferably with short run or mainly straight duct except small dip for cold air trap which will help prevent flow of cold air Factory built fireplace Figure 4 3 Outside Combustion Air Placement 3 ft min from top of uppermost chimney section to air inlet Attic insulation shield must be used to keep insulation away from chimney Ceiling firestop on floor of attic ...

Page 15: ...evated platform must be protected with a protective metal hearth strip as shown in Figure 4 6 Raised Platform Floor 2 in 51 mm 1 in 25 mm min overlap 2 in 51 mm Top piece must overlap bottom piece Figure 4 6 Protect the Front of an Elevated Platform Level the Fireplace Level the fireplace side to side and front to back Shim with noncombustible material such as sheet metal as necessary Secure the f...

Page 16: ...nal support for tall chimneys Install roof flashing according to minimum requirements Maintain minimum clearances to combustibles as specified Offsets returns may not exceed 30 from vertical Lock chimney sections together firmly to resist movement Ceiling firestops are required where chimney passes through ceiling or floor Support straps for offsets returns must be secured to adequate framing Term...

Page 17: ...in Sect 5 A Table 5 1 Do NOT connect this fireplace to a chimney flue servicing another appliance Do NOT connect to any air distribution duct or system CAUTION Fire Risk Must maintain 2 in 51 mm air clearance to insulation and other combustible materials WARNING ft meters a Minimum overall straight height 14 0 4 27 b Minimum height with offset return 16 5 5 03 c Maximum height 90 0 27 43 d Maximum...

Page 18: ...ace to the top of the starter collar See Dimensions in Section 12 Table 5 2 A B 1 1 4 in 32 mm OVERLAP Figure 5 3 Chimney Offset Return Example Your A dimension from Figure 5 3 is 14 1 2 in 368 mm Using Table 5 2 the dimension closest to but not less than 14 1 2 in 368 mm is 15 3 4 in 400 mm using a 30 offset return It is then determined from the table that you would need 36 5 8 in 930 mm Dimen si...

Page 19: ...t provide support for the pipe during con struction and check to be sure inadvertent loading has not dislodged the chimney section from the fireplace or at any chimney joint Note Inner flue and outer liner sections cannot be disas sembled once locked together Plan ahead to ensure the proper installation height is achieved with the selected chimney components Ceiling firestops must be used at ceili...

Page 20: ...estop is required see Figures 5 7 and 5 8 Roll the shield around the chimney if already installed until you have a 3 in 76 mm overlap and the three holes on each side match up large holes on top Insert three screws into the matching holes to form a tube Bend three tabs on the bottom of the tube inward to 90 to maintain chimney clearance See Figure 5 6 Rest the insulation shield on the ceiling fire...

Page 21: ...oing so be aware of the height and unsupported chimney length limitations given un der Section 5 A Chimney Requirements Check each section by pulling up slightly from the top to en sure proper engagement before installing the succeeding sections If they have been connected correctly they will not disengage when tested G Secure the Chimney When offsets and returns are joined to straight pipe sectio...

Page 22: ...ion B Termination Caps Staggered Height Gas Wood or Fuel Oil Termination Wood 20 in min 508 mm Termination Caps Same Height If using decorative cap cover s this distance may need to be increased Refer to the installation instruc tions supplied with the decorative cap cover 8 ft 2 44 m min for B Vent 20 in 508 mm min for direct vent to Perpendicular Wall Figure 6 2 Multiple Chimneys 6 6 Complete th...

Page 23: ...g required This is measured on the horizontal actual length may be larger depending on the pitch of the roof Cut out and frame the opening See Chapter 25 of the Uniform Building Code for roof framing details Assemble the Chimney Sections Through the Roof Continue to add chimney sections through the roof open ing maintaining at least a 2 in 51 mm air space to com bustible materials Install the Roof...

Page 24: ...1 TR444 Round Termination Cap Storm Collar Flashing Collar Top of Pipe 14 1 2 in 368mm max 1 1 2 in 38 mm min overlap 2 in 51 mm min Figure 6 6 Installing a TR11T TR442 Round Telescoping Termina tion Cap Note To protect against the effect of corrosion on those parts exposed to the weather the termination cap can be painted with a rust resistant paint Fire Risk The minimum overlap of cap to pipe MU...

Page 25: ...mm below the chase top See Figure 6 7 For installations utilizing an TCT1175 Terra Cotta Cap the last chimney section must be between 7 in 178 mm below the chase top and 2 in 51 mm above See Figure 6 8 For chase installations you can use a TR11 TR444 Round Termination Cap a TR11T TR442 Round Telescoping Termination Cap an ST1175 ST475 Square Termination Cap or a TCT1175 Terra Cotta Termination Cap...

Page 26: ...fireplace mortar or high temp noncombustible sealant 4 in 102 mm Outer Shell of Fireplace Figure 7 1 Gas Line Installation 7 7 Accessories Asphyxiation Risk Damper must be locked open when gas logs installed Gas fire generates fumes WARNING Fire Risk For use with solid wood fuel or decorative gas appliance only DO NOT install unvented gas logs WARNING Knockouts are provided on both sides of the fi...

Page 27: ...ubstitute materials for the factory available hearth ex tensions see Figure 8 3 and calculate insulation alternatives as per Table 8 1 and the following formulas Thermal conductivity per inch thickness k k BTU inch foot2 hour F Required thickness Rk Thermal resistance per inch thickness r r foot2 hour F BTU inch Required thickness R rB Fire Risk Metal hearth strips MUST be installed Sparks or embe...

Page 28: ...s or plasters or any combination thereof Materials that are reported as passing ASTM E 136 Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750 C shall be considered non combustible materials Non Combustible Sealant Material Sealants which will not ignite and burn Rutland Inc Fireplace Mortar 63 Rutland 76R Nuflex 304 GE RTV106 or GE RTV116 or equivalent After completin...

Page 29: ... and fireplace top and sides using only a 300 F minimum sealant E Glass Doors This fireplace has been tested and listed for use with doors as specified in Section 12 B Fireplace Components Please refer to the manual packed with each set of doors for instal lation instructions D Sidewalls Surrounds Adjacent combustible side walls must be located a minimum of 12 in 305 mm from the fireplace opening ...

Page 30: ... required to maintain the system in top operating condition Fire Risk Do not operate fireplace before reading and understanding operating instructions Failure to operate fireplace properly may cause fire WARNING Fire Risk For use with solid wood fuel or decorative gas appliance only Do not install unvented gas logs WARNING Figure 9 1 General Operating Parts Damper Handle Air Kit Handle Location ju...

Page 31: ...fitted with tightly sealed doors and windows are relatively air tight In this case an outside air source must be made available to feed combustion air from outside the home An outside air control handle allows you control of the out side air inlet if your fireplace is equipped with this option Use of outside air for combustion is highly recommended to conserve heated air within the structure and t...

Page 32: ...f water put it in the fireplace and try to burn it This sounds ridiculous but that is exactly what you are doing if you burn unseasoned wood Fire Risk Use only factory installed integral grate May cause overfire WARNING 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...

Page 33: ...ders to be burned from the fireplace and the refractory and paint to cure You may notice an industrial odor the first few fires This is consid ered normal Note When first lighting your fireplace it may be neces sary to pre warm the flue to establish a draft This is done by holding a rolled up piece of burning newspaper under the flue damper for a few moments This will help reduce smoke spillage du...

Page 34: ...t sealing construction of the structure or mechan ical exhausting devices which will create a negative air pres sure within the structure where the fireplace is located A Understanding Vent Problems If smoke spillage occurs from a fireplace opening when the door is open and the proper chimney height flue size and configuration requirements for the installation have been met there is either a leaka...

Page 35: ...chimney Downdraft from chimney temperature or from negative house pressure Does the kindling wood not ignite Condition amount arrangement of kindling and fuel Use more drier well spaced kindling and fuel Does the kindling ignite but the fuel doesn t Amount of kindling Use more kindling use smaller dry wood Condition of fuel Does the fuel ignite but not burn well Condition of fuel Use well seasoned...

Page 36: ...es Fire too close to front Build fire farther back Do not use exhaust fans during startup and or check for need for balanced air make up system Competition with exhaust devices Diagnostic Questions Possible Causes of Condition Solutions Is the damper closed No Downdraft or negative pressure Close the damper at end of burn Yes Negative pressure from exhaust fans and or house stack effect Check for ...

Page 37: ...he top off Cap Top Be sure holes in cap top and cap base are aligned European Copper Series Termination Cap CT King shown Available US only Cap Base Remove 8 screws 9 for King lift top cover Figure 11 1 Chimney Termination Cap Cleaning Fire Risk Disposal of ashes Ashes should be placed in metal container with tight fitting lid Do not place metal container on combustible surface Ashes should be ret...

Page 38: ...nts are properly engaged and the chimney is properly secured A chimney fire can permanently damage your chimney sys tem Failure to replace damaged components and make proper repairs creates risk of fire Inspect Maintenance Tasks Screens 1 Assess condition of screen and replace as necessary Screens are required 2 Verify maintenance of proper clearance to combustible household objects Glass Doors 1 ...

Page 39: ...ve height 42 in 1067 mm 23 in 585 mm 7 1 2 in 192 mm 13 in 330 mm dia 39 1 8 in 995 mm 39 1 8 in 994 mm 38 3 8 in 975 mm 8 5 8 in 219 mm 11 3 4 in 298 mm Gas Knockout Outside Air 8 3 8 in 213 mm 14 in 356 mm Gas Knockout 8 3 8 in 213 mm 14 in 356 mm 39 1 8 in 994 mm 47 in 1194 mm 28 in 711 mm 23 1 2 in 597 mm 14 in 356 mm ...

Page 40: ...3 mm HX4 Hearth Extension Model Description ST42A Fireplace with integral grate outside air kit and hearth protection strips DM1242 Glass Doors Bi fold clear view Black DM1242B Glass Doors Bi fold clear view Polished Brass DM1242S Glass Doors Bi fold clear view Stainless Steel AK17 Outside Air Kit included with fireplace HX4 Hearth Extension GR11 Integral Grate included with fireplace ...

Page 41: ...FS540 Ceiling Firestop 30 deg AS10 AS10 Straight Attic Insulation Shield 24 in 610 mm JB577 JB577 Chimney Joint Band CB576 CB576 Chimney Bracket RF570 RF570 Roof Flashing Flat to 6 12 Pitch RF571 RF571 Roof Flashing 6 12 to 12 12 Pitch TR11 TR444 Round Termination Cap TR11T TR442 Round Telescoping Termination Cap TCT1175 Terra Cotta Termination Cap ST1175 ST475 Square Termination Cap CT56 CT56 Cha...

Page 42: ...on Shield 2 in 51 mm 13 in 330 mm JB577 Chimney Joint Band 13 in 330 mm CB576 Chimney Joint Band 39 7 8 in 1013 mm 28 in 711 mm 15 1 4in 387 mm RF571 Roof Flashing 25 1 4 in 641 mm 29 in 737 mm 15 1 4 in 387 mm RF570 Roof Flashing 21 in 533 mm Inside Diameter SL1100 11 in 279 mm SL400 10 in 254 mm Outside Diameter 13 in 330 mm Catalog A B FS538 0 deg 17 in 432 mm FS540 30 deg 26 in 660 mm ...

Page 43: ...3 3 8 in 340 mm CT56 Chase Top A B C D Decorative Shroud LDS33 LDS46 15 3 4 in 400 mm 32 3 8 in 822 mm 34 3 8 in 873 mm 14 3 4 in 375 mm 23 in 584 mm 23 in 584 mm 9 3 8 in 238 mm 9 1 4 in 235 mm 17 in 432 mm 20 in 508 mm Catalog A B C D in mm in mm in mm in mm LDS33 36 914 36 914 8 1 2 216 11 279 LDS46 48 1219 72 1829 8 1 2 216 11 279 LDS BV Decorative Shroud E D A C B Catalog A B C D E LDS BV in ...

Page 44: ...Knight CT11 King 21 in 533 mm 47 3 4 in 1213 mm 24 in 610 mm 18 1 4 in 464 mm 41 1 8 in 1045 mm 20 in 508 mm 16 in 406 mm 38 3 8 in 975 mm 16 in 406 mm 21 in 533 mm 25 3 4 in 654 mm 20 5 8 in 524 mm 20 3 4 in 527 mm 38 5 8 in 981 mm 20 in 508 mm European Copper Caps Available in US only ...

Page 45: ... 711 mm with Radiation Shield 28 x 30 in 711 x 762 mm 34 x 34 in 864 x 864 mm with Radiation Shield 28 x 30 in 711 x 762 mm with Radiation Shield or 34 x 34 in 864 x 864 mm Minimum Height N A 28 1 4 in 718 mm 27 1 2 in 699 mm 28 1 4 in 718 mm 27 1 2 in 699 mm ROOFED STYLE with 12 x 22 in 264 sq in 305 x 559 mm opening on each side and 3 in 76 mm space between the radiation shield and chase top Min...

Page 46: ... Service Parts Service Parts Diagram 42 in See Through Woodburning Fireplace Service Parts ST42A Beginning Manufacturing Date N A Ending Manufacturing Date Active 11 10 1 8 4 2 6 9 7 5 12 2 4 3 3 1 Side of Fireplace 13 15 16 14 Duct sold separately 6 ...

Page 47: ...k used for lower 15427 2 Bottom Door Track used for upper 4012 001 2 Door Pivot Clip 31527 2 7 Door Support 16697D 2 Strip Protector 18320 4 8 Smoke Shield 16829F 2 Smoke Shield Kit SRV4012 036 1 Fastener Pack 12010B 1 Smoke Shield Kit Installation Instructions 4017 075 1 Smoke Shelf 16676B 2 9 Grate GR11 1 Grate Clip 28062 2 10 Starter Section Assembly 22072B 1 11 Damper Blade Assembly 34487 1 12...

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Page 51: ...ir handling devices such as exhaust fans or forced air furnaces or other causes 5 use of fuels other than those specified in the Operating Instructions 6 installation or use of components not supplied with the Fireplace or any other components not expressly authorized and approved by HHT and or 7 modification of the Fireplace not expressly authorized and approved by HHT in writing This warranty is...

Page 52: ... 5000162 5016609 5076254 5113843 5191877 5218953 5263471 5328356 5341794 5347983 5429495 5452708 5542407 5601073 5613487 5647340 5688568 5762062 5775408 5890485 5931661 5941237 5947112 5996575 6006743 6019099 6048195 6053165 6145502 6170481 6237588 6296474 6374822 6413079 6439226 6484712 6543698 6550687 6601579 6672860 6688302B2 6715724B2 6729551 6736133 6748940 6748942 6769426 6774802 6796302 684...

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