Monessen Hearth LO-RIDER LSTF36, LPF36, LO-RIDER LRCF36, LO-RIDER LLCF36, LO-RIDER LPF36 Installation And Operating Instructions Manual
LO-RIDER
DESIGNER VENT-
FREE FIREBOXES
INST ALLATION AND OPERA TING
INSTRUCTIONS
MODELS: LSTF36, LPF36, LRCF36, LLCF36
If the information in this manual is not followed exactly , a fi re
or explosion may result causing property damage, personal
injury or loss of life.
WARNINGS
For use only with a listed gas-fi red
unvented decorative room heater
not to exceed 40,000 BTU/hr. DO
NOT BUILD A WOOD FIRE.
Carefully review the instructions
supplied with the decorative
type unvented room heater
for the minimum fi replace size
requirement.
DO NOT INST ALL AN APPLIANCE
IN THIS FIREBOX UNLESS THIS
FIREBOX MEETS THE MINIMUM
DIMENSIONS REQUIRED FOR
THE INSTALLATION.
READ AND SAVE THESE INSTRUCTIONS
– Do not store or use gasoline or other fl ammable vapors and
liquids in the vicinity of this or any other appliance.
– WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone
in your building.
• Immediately call your gas supplier from a neighbor's phone.
Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the
fi re department.
– Installation and service must be performed by a qualifi ed
installer, service agency or the gas supplier.
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 qualifi ed installer, service agency, or the gas supplier.
CONTENTS
IMPORTANT SAFETY INFORMATION ................................................................................................. 3
PLANNING the INSTALLATION ............................................................................................................ 4
LOCATION of FIREBOX ........................................................................................................................ 5
CLEARANCES and HEIGHT REQUIREMENTS ................................................................................... 7
FIREPLACE FRAMING ........................................................................................................................ 9
FIREPLACE INSTALLATION ..............................................................................................................11
GAS LINE INSTALLATION .................................................................................................................. 14
CANOPY INSTALLATION ................................................................................................................... 15
WIRING to JUNCTION BOX ............................................................................................................... 16
GLASS CLEANING ........................................................................................................................... 16
ILLUSTRATED PARTS LIST ............................................................................................................... 17
USING OPTIONAL OUTSIDE AIR KIT ................................................................................................18
WARRANTY .....................................................................................................................BACK COVER
2 79D0004
IMPORTANT SAFETY INFORMATION
INSTALLER
Please leave this manual with the appliance.
IMPORTANT
Read these instructions carefully before installing this vent-free fi rebox.
• Improper installation or use of the fi rebox can cause serious injury or death from
fi re, burns, explosion or carbon monoxide poisoning.
• Do not allow fans to blow directly into the fi replace. Avoid drafts that alter burner
fl ame patterns.
• Do not use a blower insert, heat exchanger insert or other accessory, not approved
WARNING
for use with this fi rebox where applicable.
1. Due to high temperatures, the firebox should be
located out of traffic and away from furniture
and draperies.
2. Children and adults should be alerted to the hazard
of high surface temperature and should stay away
to avoid burns or clothing ignition.
3. Young children should be carefully supervised
when they are in the same room with the firebox.
4. Do not place clothing or other flammable material
near the fireplace when the firebox is in use.
5. Any safety screen or guard removed for servicing,
must be replaced prior to operating a heater within
the firebox.
6. Installation and repair should be done by a qualified
service person.
7. To prevent malfunction and/or sooting, an unvented
gas heater/firebox should be cleaned at least
annually by a professional service person. More
frequent cleaning may be required due to excessive
lint from carpeting, etc. It is imperative that
control compartments, burners and circulating air
passageways be kept clean.
8. The installation must conform with local codes or, in
the absence of local codes, with the National Fuel Gas
Code, ANSI Z223.l/NFPA 54.
9. This unit complies with Z21-91 Ventless Firebox
Enclosures for gas-fired unvented decorative room
heaters.
10. Do not install the firebox in a bathroom or bedroom.
OWNER
Please retain this manual for future reference
11. Avoid any drafts that alter burner flame patterns. Do not
allow fans to blow directly into fireplace. Do not place
a blower inside burn area of firebox. Ceiling fans may
create drafts that alter burner flame patterns. Sooting
and improper burning will occur.
12. Caution: Candles, incense, oil lamps, etc. produce
combustion byproducts including soot. Vent-free appliances will not filter or clean soot produced by these types
of products. In addition, the smoke and/or aromatics
(scents) may be reburnt in the vent-free appliance which
can produce odors. It is recommended to minimize the
use of candles, incense, etc. while the vent-free appliance
is in operation.
13. Keep room area clear and free from combustible
materials, gasoline and other flammable vapors and
liquids.
14. During manufacturing, fabricating and shipping, various
components of this appliance are treated with certain
oils, films or bonding agents. These chemicals are not
harmful but may produce annoying smoke and smells
as they are burned off during the initial operation
of the appliance; possibly causing headaches or eye
or lung irritation. This is a normal and temporary
occurrence.
The initial break-in operation should last 2-3 hours with
the burner at the highest setting. Provide maximum
ventilation by opening windows or doors to allow odors
to dissipate. Any odors remaining after this initial
break-in period will be slight and will disappear with
continued use.
15. Always have a fireplace screen in place when the
appliance is in operation and, unless other provisions
for combustion air are provided, the screen shall have an
opening(s) for induction of combustion air.
.
79D0004 3
GENERAL INSTALLATION INFORMATION
DO NOT ATTEMPT TO BURN SOLID WOOD FUELS, VENTED GAS LOG SETS, OR ANY OTHER COMBUSTIBLE IN THIS UNVENTED FIREBOX. ALSO, DO NOT INSTALL A VENT-FREE GAS LOG SET IN THIS
FIREBOX IF THE MINIMUM CLEARANCE AND HEIGHT REQUIREMENTS OF THE LOG SET ARE TOO
LARGE FOR THE FIREBOX.
The LSTF36, LPF36, LRCF36, and LLCF36 Series are vent-free fireboxes. They feature a self-contained heat-circulating
system. These units also feature a 2-in-1 flexible-face system (except for corner unit) that converts the circulating system
into a radiant system in seconds.
This installation manual will enable you to obtain a safe, efficient, and dependable installation of your vent-free
fireplace system.
Do not alter or modify the firebox or its components under any circumstances. Any modification or alteration of the firebox
system, including but not limited to the firebox and accessories, may void the warranty, listings and approvals of this system
and could result in an unsafe and potentially dangerous installation.
BEFORE YOU START:
CHECK YOUR PACKING LIST TO VERIFY THAT ALL LISTED PARTS HAVE BEEN RECEIVED.
ALSO INSPECT THE CONTENTS FOR SHIPPING DAMAGE AND IMMEDIA TEL Y INFORM YOUR DEALER
IF ANY DAMAGE IS FOUND.
You should have the following:
1. Vent-Free Gas Firebox
2. One (1) - 36" Canopy (LRCF36/LLCF36)
One (1) - 20" Canopy (LRCF36/LLCF36)
Two (2) - 36" Canopys (LSTF36/LPF36)
3. Installation and Operating Instructions
4. Five (5) drywall spacers
ITEMS REQUIRED FOR INSTALLATION
TOOLS: BUILDING SUPPLIES:
Phillips screwdriver Square Framing materials
Hammer Piping complying with local codes Wall finishing materials
Saw and/or saber saw Tee joint Caulking material (noncombustible)
Level Pipe wrench Fireplace surround materials (noncombustible)
Measuring tape Pliers
Electric drill and bits Pipe sealant approved for use
with propane/LPG (resistant to sulfur compounds)
Refer to the installation instructions provided with the log sets for items required for log set installation.
Illustrations shown in this manual refl ect “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 specifi c installation
NOTICE
requirements.
4 79D0004
PLANNING THE INSTALLATION
In planning the installation for the appliance it is necessary to determine where the unit is to be installed and whether optional
accessories are desired. Gas supply piping should also be planned. 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. Field wire main power supply to circulating models with fan kit. (Electrical connections should only be performed
by an experienced, licensed/certified tradesman).
3. Plumb gas line. (Gas connections should only be performed by an experienced, licensed/certified tradesman).
4. Install vent-free gas log heater per the instructions provided with the vent-free gas log heater.
5. Complete finish wall material and surround to your individual taste.
42 3/16"
39 9/16"
23 13/16"
22 5/16"
TOP
5 5/8"
12 3/8"
11 7/8"11 7/8"
11 3/8"
3 3/16"
2 5/8"
5 5/8"
1 3/4"
35 15/16"
FRONTREAR
28 1/16"
39 9/16"
"
Figure 1 - Firebox Dimensions
27 3/4"
1 13/16"
35 9/16"
27 3/4"
"
23 13/16"
OPEN
SIDE
"
"
79D0004 5
LOCATION OF FIREBOX
Carefully select the best location for installation of your vent-free firebox. The following factors should be taken into consideration.
• Clearance to side wall, ceiling, woodwork, and windows. Refer to “CLEARANCES and HEIGHT REQUIREMENTS”
section below and on pages 8 and 9. Minimum clearances to combustibles must be maintained.
• Location must not be affected by drafts caused by kitchen exhaust fans, ceiling fans, return air registers for forced air
furnaces/air conditioners, windows, or doors.
• Installation must provide adequate ventilation and combustion air.
• DO NOT INSTALL THIS FIREBOX IN A BATHROOM.
• This firebox enclosure is approved for bedrooms on the condition that the unvented room heater does not exceed 10,000
BTUs input and the room is properly sized for combustion air.
• Location should be out of high traffic or windy or drafty areas.
• DO NOT INSTALL WHERE CURTAINS, FURNITURE, CLOTHING OR OTHER FLAMMABLE OBJECTS
ARE LESS THAN 36" FROM FRONT OF HEATER.
• Never obstruct the front opening of the vent-free firebox or restrict the flow of combustion and ventilation air.
• Minimize modifications to existing construction. Refer to Figure 2 for location suggestions.
• Do not install in the vicinity where gasoline or other flammable liquids may be stored. The vent-free firebox must be
kept clear and free from these combustible materials.
CORNER RIGHT
CORNER LEFT
PENINSULA
CORNER LEFT
SEE-THROUGH
CORNER RIGHT
Figure 2 - Suggested Firebox Locations
6 79D0004
CLEARANCES and HEIGHT REQUIREMENTS
CLEARANCES and HEIGHT REQUIREMENTS
Ensure that minimum clearances shown in Figures 3 through 7 are maintained. Left and right clearances are determined
when facing the front of the firebox.
Follow these instructions carefully to ensure safe installation. Failure to follow these requirements may create a
fire hazard.
1. Sidewall Clearances — The clearance from the inside of the appliance to any combustible adjacent wall should not
be less than 2
2. Ceiling Clearance — The ceiling must be at least 42" from the top of the firebox opening (bottom of hood). Refer
to Figure 3.
3. Back Wall Clearance — The appliance may be placed against a combustible back wall.
4. Parallel Wall Clearance — The clearance from the opening of the firebox to any wall that is parallel to the opening
should not be less than 36" (LSTF36 and LPF36 models only). Refer to Figure 4.
7
/8". Refer to Figure 3.
42"
36"
55/8"
Figure 3 - Sidewall and Ceiling Clearances
C
B
A
Figure 5 - Minimum Hearth Dimensions
79D0004 7
Figure 4 - Parallel Wall Clearance
(LSTF36 and LPF36 Models Only)
Minimum Hearth Dimensions
AB C
See-Thru 33 3/16" 27 3/4" 21 15/16"
Corner 35 5/16" 27 3/4" 21 15/16"
Peninsula 35 5/16" 27 3/4" 21 15/16"
CLEARANCES and HEIGHT REQUIREMENTS
5. Mantel clearances — The canopy supplied with
the unit must be installed. If a combustible mantel
is installed, it must meet the clearance requirements
detailed in Figure 6.
2.5"
6. Floor clearance — This fi rebox hearth opening
(inter-chamber fl oor) must be installed
1
at least
/ 2" above any combustible
fl ooring material or, the fi rebox hearth
may be installed fl ush with the fl oor
if noncombustible material such as
slate or marble is installed between
the base of the fi rebox and the com-
bustible fl ooring. The firebox may be
installed directly on a combustible
floor or raised on a platform of an
appropriate height. Do not place firebox on carpeting, vinyl, or other soft
floor coverings. It may, however, be
Figure 6 a&b - Minimum Mantel Clearances for Canopy
placed on a flat wood, plywood, particle board, or other hard surfaces. Be
sure firebox rests on a solid continuous floor or platform with
appropriate framing for support so that no cold air can enter room
from under the firebox. Refer to Figure 8.
NOTE: The combustible area above the facing must
not protrude more than 3/4" from the facing. If it does,
it is considered a mantel and must meet the mantel
requirements listed in this manual.
Figure 6c - Minimum Mantel Clearances
12"
10"
8"
6"
17"
13"
24"
22"
20"
Canopy
and Wide Profi le Canopy
FIREPLACE
HOOD
TOP VIEW
2.50
1.00
3.00
COMBUSTIBLE
1.50
5.00
5.63
12"
8"
14"
8"
Wide Profi le
Canopy
MATERIAL
AREA
WALL
3.50
4.50
45°
Combustible Material
Figure 7 - Floor Clearance above Combustible
Flooring Material
8 79D0004
1/2"
MIN.
Noncombustible
Material
14"
MIN.
0"
Figure 8 - Floor Clearance above Noncombustible
Flooring Material
FIREPLACE FRAMING
Firebox framing can be built before or after the appliance is set in place. Construct firebox framing following Figures 9
through 14 on pages 9 and 10 for your specific installation requirements. Refer to Figure 1 on Page 5 for firebox dimensions.
The framing headers may rest on the top of the firebox standoffs.
The firebox may be installed directly on a combustible floor or raised on a platform of an appropriate height. Do not place
firebox on carpeting, vinyl, or other soft floor coverings. It may, however, be placed on a flat wood, plywood, particle board,
or other hard surfaces. Be sure firebox rests on a solid continuous floor or platform with appropriate framing for support so
that no cold air can enter room from under the firebox.
The classification “noncombustible material” includes, but is not limited to: stone, brick, and mortar. Noncombustibles are
safe to overlay the black-painted metal face, including radiant plates, and
do not pose a fire hazard. Any noncombustible finish material must not
Do not fi ll spaces around
fi rebox with insulation or
other materials. This could
cause a fi re.
WARNING
10 9/16"
11 9/16"
extend past or interfere with the fireplace opening.
The classification “combustible material” includes, but is not limited to:
plywood, drywall, and particle board. Combustible materials may contact
the sides, bottom, or back of the firebox. Do not overlay the black painted
face with combustible materials.
10 9/16"
12 5/8"
GAS
CONNECTION
NOTE:
All dimensions are based on
Two by Four
41 9/16"
1/2" drywall. If 5/8" drywall
is used, dimensions must be
changed accordingly.
22 3/16"
Figure 9 - Top View of Framing Specifi cations for
Peninsula Units (Model LPF36)
GAS
CONNECTION
41 9/16"
23 1/4"
Figure 10 - Top View of Framing Specifi cations for
Corner Units (Model LRCF36/LLCF36)
3413/16"
419/16"
Figure 11 - Framing Specifi cations for
Peninsula Units (Model LPF36)
79D0004 9
231/4"
223/16"
3413/16"
419/16"
Figure 12 - Framing Specifi cations
for Corner Units (Model LRCF36/LLCF36)
FIREPLACE FRAMING
42 9/16"
10 9/16"
GAS
CONNECTION
22 3/16"
11 9/16"
Two by (2x)
fi ller to be
installed after
fi replace is set
in place
Two by Four
223/16"
3413/16"
425/8"
Figure 13 - Top View of Framing Specifi cations for
See-Through Unit (Model LSTF36)
The fi replace must be installed giving
full consideration to the clearance and
height requirements identifi ed in this
manual.
WARNING
Figure 14 - Framing Specifi cations for
See-Through Unit (Model LSTF36)
10 79D0004
PENINSULA UNIT (LPF36)
INSTALLATION
1. Attach nailing flanges in desired position. See Figure
16.
2. Slide firebox into prepared framing or position firebox
in its final position and frame later.
3. Level and plumb firebox by checking edges of firebox.
Shim if necessary.
4. Attach nailing flanges to studs. See Figure 15.
5. Install canopy. Refer to page 15 for canopy installation.
FIREPLACE INSTALLATION
Nailing Flange
Figure 15 - Location of Nailing Flanges and
Floor Screws
Figure 16a - 1/2 drywall position Figure 16b - 5/8 drywall position
79D0004 11
FIREPLACE INSTALLATION
SEE-THROUGH UNIT (LSTF36) INSTALLATION
1. Attach nailing flanges in desired position. See Figure 16.
3. Slide firebox into prepared framing or position firebox in its final position and frame later.
4. Level and plumb firebox by checking edges of firebox. Shim if necessary.
5. Attach nailing flanges to studs. See Figure 17.
6. Install canopy. Refer to page 15 for canopy installation.
Nailing Flange
Figure 17 - Location of Nailing Flanges and Floor Screws
12 79D0004
FIREPLACE INSTALLATION
RIGHT (LRCF36) AND LEFT (LLCF36) CORNER INSTALLATION
1. Attach nailing fl anges in desired position. See Figure 16.
2. Slide firebox into prepared framing or position firebox in its final position and frame later.
3. Level and plumb firebox by checking edges of firebox. Shim if necessary.
4. Attach nailing flanges to studs. See Figure 18.
5. Install canopy. Refer to page 15 for canopy installation.
Figure 18 - Location of Nailing Flanges and
79D0004 13
Floor Screws
GAS LINE INSTALLATION
Plumbing connections should only be performed by a
qualifi ed, licensed plumber. Main gas supply must be
off when plumbing gas line to fi replace or performing
service.
CAUTION
Consult all local codes. All gas piping must be installed to comply with local codes, or in the absence of local codes, with
the latest edition of the National Fuel Gas Code, ANSI Z223.1/NFPA54.
The gas supply line must have an ANSI approved manual shutoff valve, upstream of the appliance. Either a recessed valve
with a key should be mounted to the wall or floor outside the firebox, or an on/off appliance-style valve with union can be
placed inside the firebox. A plugged 1/8" NPT pressure taping point is recommended for service and may be incorporated
to the valve assembly. Bring a minimum 1/2" gas supply line through the knockout hole provided in the firebox.
A sediment trap may be upstream of the heater to prevent moisture and contaminants from passing through trap to
the heater controls and burners. Failure to do so could prevent the heater from operating reliably. Consult applicable
codes.
In addition to the regulator fitted to the heater, an external regulator must be used on all propane/LPG heaters to reduce
the supply tank pressure to 13" w.c. (maximum). Any copper tubing used to supply propane/LPG from the tank must be
internally tinned. Note: When connecting propane/LPG vent-free room heaters, you must use pipe sealant
resistant to propane/LPG.
Check gas type: The gas supply must be the same as stated on the heater’s rating plate. If the gas supply is different,
DO NOT INSTALL THE HEATER. Contact your dealer for the correct model.
Connecting directly to an unregulated
propane/LPG tank can cause an
explosion.
WARNING
After completing connection, test all gas joints from the gas meter to the gas heater regulator for leaks. Using soap and
water solution or a gas sniffer. DO NOT USE AN OPEN FLAME
Do not connect directly to natural
gas 1/2 PSI or 2 PSI systems. Always
make sure natural gas pressure is
regulated 10.5 w.c. (maximum before
WARNING
operating the unit).
14 79D0004
CANOPY INSTALLATION
A canopy is furnished with each firebox and MUST be installed for safe operation. Refer to Figure 19.
The firebox canopy must not be
modifi ed or replaced with a canopy
that may be provided with the
unvented decorative room heater.
WARNING
Close fi replace screen panel before
operating decorative type unvented
room heater.
WARNING
1. Align the canopy with the holes in the top frame.
2. Secure canopy with five (5) screws provided.
3 Repeat on other side for See-Through Unit (LSTF36) and
Peninsula Unit (LPF36). Install the 20" canopy on the
shorter end with two (2) screws (LRCF36/LLCF36).
Figure 19 - Canopy Installation
79D0004 15
WIRING TO JUNCTION BOX & GLASS CLEANING
FORCED AIR KIT
If you are installing the forced air kit Model BLOTDL on the LSTF36, LPF36, GCRF36 or GCLF36 units, see the installation instructions below supplied with kit.
Electrical connections should only be performed by a qualifi ed, licensed electrician,
main power must be off when connecting to main electrical power supply or
performing service.
The blower when installed, must be electrically grounded in accordance with local
codes or in the absence of local codes, with the National Electrical Code ANSI/NFP A
CAUTION
70.
WIRING TO JUNCTION BOX
NOTE: The wire must be run to the junction box before framing the fi rebox.
1. Wire the receptacle into an electrical circuit. Use minimum 60°C wire in accordance to prevailing codes.
2. The junction box is preinstalled at the factory. Remove junction box cover by removing the screw from the out
side firebox wall.
3. The junction box cover has a factory-installed “romex” style strain relief connector. Connect the wires according
to the wiring diagram below. Route the connected wire leads through the strain relief connector. See Figure 20.
120VAC
Receptacle
Junction Box
BLACK
GREEN
TANTANWHITEBLACKBLACK
Figure 20a - Wiring Diagram for Junction
GLASS CLEANING
NOTE: Glass should not be removed for cleaning
Speed Control
Figure 20b - Wiring Diagram for Blower
NOTE: For see thru and peninsula
models, two blower kits may be used
Optional Thermostatic Switch
and will be controlled independently.
When Cleaning Glass
• Allow glass to cool before cleaning.
• Never use abrasive cleaning materials on glass.
• Keep children and pets at safe distance away.
• Never operate fireplace if glass is broken. Replace any glass that is chipped, cracked or broken. Replacement
glass frame assemblies MUST be supplied by the fireplace manufacturer. Do not substitute other materials.
• Handle glass frame with care. Avoid striking or scratching glass on hard objects.
16 79D0004
ILLUSTRATED PARTS LIST
Figure 21 - Exploded View
6
1
3
8
7
2
5
10
4
STANDARD FEATURES
ITEM DESCRIPTION LST LPF LRCF/LLCF
1 36” Canopy 71D0500 71D0500 71D0500
2 20” Canopy - - 79D0082(1)
3 Screen Panel 79D0001(4) 79D0001(4) 79D0001(3)
4 Screen Rod Side 26D0138(4) 26D0138(4) 26D0138(2)
5 Screen Rod End - - 43D0116(1)
6 Brick Panel Common 79D0093(1) 79D0093(1) 79D0093(1)
6 Brick Panel Corner - - 79D0094(1)
6 Brick Panel Hearth 79D0095(1) 79D0095(1) 79D0095(1)
6 Brick Panel See Thru 79D0096(1) - 7 Door Assembly - 79D0034(1) 8 Nailing Flange 79D0091(5) 79D0091(5) 79D0091(5)
9 Outside Air Kit* AK-4(1) AK-4(1) AK-4(1)
10 Blower Kit BLOTDL BLOTDL BLOTDL
3
ACCESSORIES
*Not shown
79D0004 17
USE OF OPTIONAL AK-4 OUTSIDE AIR KIT
COMBUSTION AIR
1. Locate combustion air assembly at an exterior location which is not likely to be accidentally blocked in any manner.
Locate assembly amin. of 12" above the snow line to prevent blockage by snow accumulation.
2. Never mount the combustion air inlet assembly in a garage or storage area where combustible fumes such as gasoline
might be drawn into the fi replace.
3. Combustion air can be drawn from the crawl space under a house when an adequate supply of air is provided by open
ventilation.
4. CAUTION: Do not take combustion air from attic space or garage space.
5. locate air supply at least 3' away from any appliance vent terminal.
6. Avoid extremely long runs and numerous turns in the duct leading from the fi replace to the combustion air assembly.
These conditions increase the resistance to the free fl ow of air through the duct. See Figur es 22 through 25 for methods
of installing the outside air for combustion assemblies.
Note: Fireplace model in illustrations may not be representative of your appliance.
Above
Snow
Level
Ground
Level
Figure 22 - Basement Installation
Duct Extended
to Miss Joist
Basement
Wall
8'max.
Inlet Grill in
Soffi t
(Overhang)
Figure 23 - Concrete Slab Installation
(Optional Outside Air Runs)
Inside Wall
To Outside Wall
Figure 24 - Installation Above Basement or
Crawl Space
18 79D0004
Outside
Wall
Figure 25 - 45° Corner Installation on
Slab Floor
USE OF OPTIONAL AK-4 OUTSIDE AIR KIT
The use of outside air for combustion is optional unless required by building codes. It is only necessary to supply outside
combustion air to one side of the fi replace. Use the model AK4 combustion air kit.
MODEL AK-4 COMBUSTION AIR ASSEMBL Y
1. Remove the cover plate from the 4" outlet opening location on the left or
right outside of the fi replace.
2. Place the insulation ring between the AK-4 starting collar and fireplace wall.
3. Place the starting collar (4") into the hole on the side of fi replace. Fasten it in place with the four sheet metal screws
provided. See Figures 26 and 28.
Note: The air starting collar extends through the fi replace outer wrap. When the air starting collar is
securely attached, it will form a seal against the fi replace wall.
4. Attach outside duct to starting collar with duct clamp or screws. See Figure 27.
DO NOT remove the
cover if the outside air
will not be connected.
WARNING
Left Side of
Fireplace
Shorter End
of Air Starting
Figure 26 - Attaching Outside Air Starting Collar
and Insulation Ring to Left Side of Fireplace
5. Cut a 6-inch diameter opening for model AK-4 in the outside
wall covering where the outside vent is to be located. See
Figure 28.
6. Select and cut a piece of duct long enough to attach to the
fi replace and stick out at least 3" beyond the face of the wall
to which the AK-4 inlet air vent will be attached. See Figur e
27.
Insulation Ring
AK-4 Starting
Collar
Sheet
Meal
Screws
Collar
6" Diameter
Hole
Duct
Extending
3"min.
Screws
Left Side of
Fireplace
Figure 27 - Attaching Outside Duct
to Starting Collar
Air Starting
Collar
Screw
Duct
Nail
Holes
Use FP-4 U duct for maximum effi ciency
and safety. Do not use a combustible
duct. Always use UL Listed Class 0 or
1 duct material.
WARNING
79D0004 19
AK-4 Inlet
Air Vent
Figure 28 - Combustion Air Assembly for
Model No. AK-4
Screws
Continued
USE OF OPTIONAL AK-4 OUTSIDE AIR KIT
MODEL AK-4 COMBUSTION AIR ASSEMBL Y (CONTINUED)
7. If the duct is the insulated type, push the insulation back from one end of
the duct approximately 2". See Figure 29.
8. Slip the exposed end of the duct over the starting collar on the fi replace.
9. Using the sheet metal screws provided, secure the duct end to the collar
attached to the fi replace.
Duct
Connector
Approximately
2"
10. Nail or screw the combustion air assembly to the surface of the wall.
Note: If the wall covering is brick or stone, use appropriate
masonry fasteners. If necessary, splice the duct. Use a model
403-duct connector to splice duct sections.
INSTALLING MODEL 403 DUCT CONNECTOR
1. Push insulation back approximately 2" from the end of each duct.
2. Slip each duct over duct connector until an equal length of connector extends into each duct.
3. Place duck clamp over the end of each duct. Tighten duct clamp down snuggly.
4. Push insulation back into place and over duct clamp.
Figure 29 - Installing Duct
Connector 403
Insulation
Duct Clamp
20 79D0004
NOTES
79D0004 21
NOTES
22 79D0004
NOTES
79D0004 23
LIMITED LIFETIME WARRANTY POLICY
LIFETIME WARRANTY
The following components are warranted for life to the original owner, subject of proof of purchase: Firebox,
Combustion Chamber, Heat Exchanger, Grate, and Stainless Steel Burners.
FIVE YEAR WARRANTY
The following components are warranted for 5 years to the original owner, subject of proof of purchase: Vent Free
Ceramic Fiber Logs, Catalytic Filter and Aluminized Burners.
BASIC WARRANTY
Monessen Hearth Systems (MHS) warrants the components and materials in your gas appliance to be free from
manufacturing and material defects for a period of two years from date of installation. After installation, if any of
the components manufactured by MHS in the appliance are found to be defective in materials or workmanship,
MHS will, at its option, replace or repair the defective components at no charge to the original owner. MHS will
also pay for reasonable labor costs incurred in replacing or repairing such components for a period of two years
from the date of installation. Any products presented for warranty repair must be accompanied by a dated proof
of purchase.
This Limited Lifetime Warranty will be void if the appliance is not installed by a qualified installer in accordance
with the installation instructions. The Limited Lifetime Warranty will also be void if the appliance is not operated
and maintained according to the operating instructions supplied with the appliance, and does not extend to (1)
firebox/burner assembly damage by accident, neglect, misuse, abuse, alteration, negligence of others, including
the installation thereof by unqualified installers, (2) the costs of removal, reinstallation or transportation of
defective parts on the appliance, or (3) incidental or consequential damage. All service work must be performed
by an authorized service representative.
This warranty is expressly in lieu of other warranties, express or implied, including the warranty of merchantability
of fitness for purpose and of all other obligations or liabilities. Monessen Hearth Systems, Inc. does not
assume for it any other obligations or liability in connection with the sale or use of the appliance. In states
that do not allow limitations on how long an implied warranty lasts, or do not allow exclusion of indirect
damage, those limitations of exclusions may not apply to you. You may also have additional rights not covered
in this Limited Lifetime Warranty.
MHS reserves the right to investigate any and all claims against the Limited Lifetime Warranty and decide
upon method of settlement.
For information about this warranty, contact:
Technical Services
Monessen Hearth Systems
149 Cleveland Drive
Paris, Kentucky 40361
24 43D0121
MAY 2008 P/N 79D0004 • Rev. 2
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