Monessen Hearth LO-RIDER LCUF36 User manual

For use with a listed gas-fired
unvented decorative room heater
not to exceed 40,000 BTU/hr.
Do
Not Build a Wood Fire.
READ AND SAVE THESE INSTRUCTIONS
WARNINGS
LO-RIDER
UNVENTED
VENT-FREE FIREBOXES
INSTALLATION AND OPERATING
INSTRUCTIONS
MODEL: LCUF36
Carefully review the instructions
supplied with the decorative type
unvented room heater for the mini-
mum fi replace size requirement.
DO NOT INSTALL AN APPLIANCE
IN THIS FIREBOX UNLESS THIS
FIREBOX MEETS THE MINIMUM
DIMENSIONS REQUIRED FOR
THE INSTALLATION.
WARNINGS
If the information in this manual is not followed
exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
– 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.
WARNINGS
WARNINGS
WARNINGS
WARNINGS
WARNINGS
WARNINGS

2
26D4721
CONTENTS
Important Safety Information
.................................
3
Product Features
......................................................
5
Before You Start
.....................................................
5
General Installation Information
.............................
6
Firebox External Dimensions
.................................
6
Minimum Hearth Dimensions
.................................
7
Location of Fireplace
...............................................
7
Clearances and Height Requirements
....................
8
Fireplace Framing
..................................................
10
Gas Line Installation
..............................................
12
Canopy Installation
................................................
13
Other Optional Equipment
.....................................
14
Illustrated Parts Breakdown
..................................
14
Warranty
..................................................
Back Cover

26D4721
3
9. The installation must conform with local codes or, in
the absence of local codes, with the
National Fuel Gas
Code, ANSI Z223.l/NFPA54.
10. This unit complies with ANSI Z21.91.2001 ventless fi re-
box enclosures for gas-fi red unvented decorative room
heaters.
11. Do not install heater in a bathroom or bedroom.
12. Correct installation of the logs, proper location of the
heater, and annual cleaning are necessary to avoid
potential problems with sooting. Sooting, resulting from
improper installation or operation, can settle on surfaces
outside the fi replace. See log placement instructions for
proper installation.
13. Avoid any drafts that alter burner fl ame patterns. Do not
allow fans to blow directly into fi replace. Do not place
a blower inside burn area of fi rebox. Ceiling fans may
create drafts that alter burner fl ame patterns. Sooting
and improper burning will occur.
14.
Caution:
Candles, incense, oil lamps, etc. produce
combustion byproducts including soot. Vent-free
appliances will not fi lter 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.
15. An unvented gas-fi red heater uses air (oxygen) from the
room in which it is installed. Provisions for adequate
combustion and ventilation air must be provided. See
installation guidelines.
INSTALLER
Please leave these instructions with the owner.
OWNER
Please retain these instructions for future reference
.
IMPORTANT
Read these instructions carefully before installing or trying to operate a vent-free gas heater in this fi rebox.
IMPORTANT SAFETY INFORMATION
1. Due to high temperatures, the appliance should
be located out of traffi c 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 apli-
ance.
4. Do not place clothing or other fl ammable material
on or near the appliance.
5. Any safety screen or guard removed for servicing
an appliance, must be replaced prior to operating
the heater.
6. Installation and repair should be done by a qualifi ed
service person.
7. To prevent malfunction and/or sooting, an unvented
gas heater should be cleaned before use at least
annually by a professional service person. More
frequent cleaning may be required due to exces-
sive lint from carpeting, bedding material, etc. It is
imperative that control compartments, burners and
circulating air passageways be kept clean.
8.
CARBON MONOXIDE POISONING:
Early signs of
carbon monoxide poisoning are similar to the fl u with
headaches, dizziness and/or nausea. If you have these
signs, obtain fresh air immediately. Have the heater
serviced as it may not be operating properly.
Continued on page 4
• Any change to this heater or its controls can be dangerous.
• Improper installation or use of the heater 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 any drafts that alter
burner fl ame patterns.
• Do not use a blower insert, heat exchanger insert or other accessory, not approved
for use with this heater where applicable.
WARNING

4
26D4721
IMPORTANT SAFETY INFORMATION
Continued from page 3
16. Keep room area clear and free from combustible materi-
als, gasoline and other fl ammable vapors and liquids.
17. Unvented gas heaters are a supplemental zone heater.
They are not intended to be a primary heating appli-
ance.
18. Unvented gas heaters emit moisture into the living area.
In most homes of average construction, this does not pose
a problem. In houses of extremely tight construction,
additional mechanical ventilation is recommended.
19. During manufacturing, fabricating and shipping, various
components of this appliance are treated with certain
oils, fi lms 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 two to three
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.
20. Input ratings are shown in BTU per hour and are for
elevations up to 2,000 feet. For elevations above 2,000
feet, input ratings should be reduced 4 percent for each
1,000 feet above sea level. Refer to the National Fuel
Gas Code.
21. The appliance and its appliance main gas valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig (3.5 kPa).
22. The appliance must be isolated from the gas supply
piping system by closing its equipment shutoff valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 psig
(3.5 kPa).
23. Do not use this room heater if any part has been under
water. Immediately call a qualifi ed service technician
to inspect the room heater and to replace any part of the
control system and any gas control which has been under
water.
24. Never burn solid fuels in a fi replace where a unvented
room heater is installed.
25. Always have a fi replace screen in place when the appli-
ance is in operation, and unless other provisions for
combustion air are provided, the screen shall have an
opening(s) for induction of combustion air.
26. Do not fi ll spaces around the fi rebox with insulation or
other materials. These spaces must be maintained to pre-
vent the fi rebox from coming in contact with combustible
materials.
www.nfi certifi ed.org
We suggest that our gas hearth
products be installed and
serviced by professionals who
are certifi ed in the U.S. by the
National Fireplace Institute
®
(NFI) as Gas Specialists.
Never connect unit to private
(non-utility) gas wells. This
gas is commonly known as
wellhead gas.
WARNING

26D4721
5
The LCUF36 is a vent-free fi reboxe. They feature a self contained heat-circulating system. This installation manual will
enable you to obtain a safe, effi cient and dependable installation of your vent-free fi rebox system.
Do not alter or modify the fi rebox or its components under any circumstances. Any modifi cation or alteration of the fi rebox
system, including but not limited to the fi rebox 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
Carefully inspect the contents for shipping damage. If any parts are missing or damaged, immediately inform the
dealer from whom you purchased the appliance. Do not attempt to install any part of the appliance unless you have
all the parts in good condition.
MAKE SURE YOU HAVE RECEIVED ALL PARTS
Check your packing list to verify that all listed parts have been received. You should have the following:
1. Vent-Free Gas Firebox 3. Installation and Operating Instructions
2. Canopy 4. Five (5) sheet metal screws for canopy
WHAT YOU WILL NEED FOR INSTALLATION
TOOLS BUILDING SUPPLIES
• Phillips screwdriver • Square • Framing materials
• Hammer •
Piping complying with local codes
• Wall fi nishing materials
• Saw and / or sabersaw • 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/L.P.G.
(resistant to sulfur compounds)
Refer to the installation instructions provided with the log sets for items required for log set installation.
PRODUCT FEATURES
Do not attempt to burn solid wood fuels, vented gas log sets, or any other combustible
in this unvented fi rebox. Also, do not install a vent-free gas log set in this fi rebox
if the minimum clearance and height requirements of the log set are too large
for the fi rebox.
WARNING
Illustrations shown in this manual 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 specifi c installation
requirements.
NOTICE

6
26D4721
D
F
E
H
63/4"
13/8"
32"
321/2"
21/2"21/2"
431/2"
40"
2" Knockout
95/8"
C
B
A
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 fi rebox prior to framing or into prepared framing.
2. Plumb gas line. (Gas connections should only be performed by an experienced, licensed/certifi ed tradesman).
3. Install vent-free gas log heater per the instructions provided with the vent-free gas log heater.
4. Complete fi nish wall material, surround and optional hearth extension to your individual taste.
FIREBOX EXTERNAL DIMENSIONS
GENERAL INSTALLATION INFORMATION
Figure 1 - Firebox Dimensions
LCUF36
A
41"
B
36"
C
20
1
/
2
"
D
30
1
/
2
"
E
24
1
/
4
"
F
21"
H
36"
21"
36"

26D4721
7
MINIMUM HEARTH DIMENSIONS
GENERAL INSTALLATION INFORMATION
AND
LOCATION OF FIREBOX
LCUF36
A
24
1
/
2
"
B
16"
C
36"
D
32"
Figure 2 - Minimum Hearth Dimensions
LOCATION OF FIREBOX
Carefully select the best location for installation of your
vent-free fi rebox. The following factors should be taken
into consideration:
• Clearance to side wall, ceiling, woodwork and
windows. See “Clearances/Height Requirements on
page 8. 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 BED-
ROOM OR BATHROOM.
• Location should be out of high traffi c or windy or
drafty areas.
•
DO NOT INSTALL WHERE CURTAINS, FURNITURE, CLOTHING OR OTHER FLAMMABLE OBJECTS
ARE LESS THAN 42" FROM FRONT OF HEATER.
• Never obstruct the front opening of the vent-free fi rebox or restrict the fl ow of combustion and ventilation air.
• Minimize modifi cations to existing construction. Refer to Figure 3 below for location suggestions.
• Do not install in the vicinity where gasoline or other fl ammable liquids may be stored. The vent-free fi rebox must be
kept clear and free from these combustible materials.
Figure 3 - Location of Firebox

8
26D4721
9"
Minimum
42"
Minimum
9"
Minimum
Ensure that minimum clearances shown in Figures 4 through 7 are maintained. Left and right clearances are determined
when facing the front of the fi rebox.
Follow these instructions carefully to ensure safe installation. Failure to follow these requirements may create a
fi re hazard.
1.
Sidewall clearances:
The clearance from the inside of the appliance to any combustible wall should not be
less than 9".
See Figure 4.
2.
Ceiling clearance:
The ceiling must be at least 42” from the top of the fi rebox opening.
See Figure 4.
3.
Back wall clearnace:
The appliance may be placed against a combustible back wall.
Figure 4 - Clearance and Height Requirements
Continued on page 10
CLEARANCES
AND
HEIGHT REQUIREMENTS

26D4721
9
12"
10"
8"
6"
2
1
1
/
2
"
12"
16"
19"
21"
23"
Non-combustible Material
CLEARANCES
AND
HEIGHT REQUIREMENTS
4.
Mantel clearances:
The canopy supplied with the unit must be installed. If a combustible mantel is installed, it must
meet the clearance requirements as shown in
Figure 5
. However, if lower mantel height is desired,
see page 15
for
canopy options.
5. Floor clearance:
This inner chamber fi rebox fl oor must be installed at least 1
3
3
/
8
" above any combustible fl ooring mate-
rial, such as carpeting or asphalt tile, which is closer than 14" to the base of the fi rebox.
See Figure 6.
Or
The inner chamber fi rebox fl oor may be installed nearer to the fl oor if a minimum of 14" of noncombustible material
such as slate or marble is installed between the base of the fi rebox and the combustible fl ooring.
See Figure 7.
Figure 5 - Mantel Clearances
Figure 6 - Minimum Clearance above
Combustible Flooring
Figure 7 - Minimum Clearance above Combustible
Flooring with Non-Combustible Material Installed at
Base of Fireplace
Combustible
Material
1
3
/
8
" Minimum
14" Minimum
Can Be Less
than 1
3
/
8
"
Non-Combustible
Material

10
26D4721
H
G
D
F
E
A
C
B
A
1/2" or 5/8"
C
A
G
C
G
A
FIREPLACE FRAMING
Firebox framing can be built before or after the appliance is set in place. Construct fi rebox framing following
Figures 8
through 11
and the chart below for your specifi c installation requirements.
See Figure 1 on Page 6
for fi rebox dimensions.
The framing headers may rest on the top of the fi rebox standoffs.
The fi rebox may be installed directly on a combustible fl oor or raised on a platform of an appropriate height. When the
fi rebox is installed directly on carpeting, tile, or other combustible material, other than wood fl ooring, the fi rebox shall be
installed on a metal or wood panel extending the full width and depth of the enclosure.
LCUF36
A 41
A 41
1
/
4
"
B 44
B 44
1
/
2
"
C 30
C 30
1
/
2
"
D 15
D 15
1
/
4
"
E 71
E 71
1
/
2
"
F 35
F 35
3
/
4
"
G 21"
G 21"
H 50
H 50
1
/
2
"
A 41
B 44
C 30
D 15
E 71
F 35
G 21"
H 50
Figure 8 - Corner Installation
Figure 10 - Stud Location
Figure 9 - Inside Chase
Installation
Figure 11 - Recessed
Installation
Do not fi ll spaces around fi rebox with
insulation or other materials. This
could cause a fi re.
WARNING
Combustibles may not come any closer to the top of the
enclosrue than the standoffs will allow.

26D4721
11
K
J
FIREPLACE FRAMING
1. Bend out the nailing fl anges located on each side of the fi rebox.
2. Slide the fi rebox into prepared framing or position fi rebox in its fi nal position and frame later.
3. Level the fi rebox by checking the top edge of the fi rebox. Shim if necessary.
4. Anchor fi rebox to the side framing members using 8d nails or other suitable fasteners.
See Figure 13.
5. The canopy must be installed for safe operation of the heater. See page 13 for canopy installation details.
When fi nishing a custom cabinet, mantel, or other built-in enclosure, the open-
ing size to accommodate the fi replace with trim installed is as follows:
Figure 12 - Custom Cabinet
Figure 13 - Location of Nailing Flanges
Nail Sides
Through Nailing
Flanges
LCUF36 with trim
K
41
7
/
8
/8/
"
J
35
7
/
8
/8/
"
LCUF36 with trim
41
35
The fi replace must be installed giving
full consideration to the clearance
and height requirements identifi ed in
this manual.
WARNING
This appliance is approved for the installation of drywall or other combustible
materials against the sides or top of the black-painted fi rebox face.
Noncombustible facings will not burn when exposed to heat coming off this
fi replace. The classifi cation, “Noncombustible material” includes brick and
mortar, stone or marble. These are safe to overlay the black-painted metal face
and do not pose a fi re hazard. Never overlap the fi relace opening.

12
26D4721
GAS LINE INSTALLATION
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
1
/
2
" gas line may enter either from the left side or right side of the fi rebox. Gas access holes are provided on both sides
of the fi rebox.
Install a
1
/
2
" gas line through the hole provided in the fi rebox. Outside the fi rebox, the gas line connects to a gas shut-off valve
recessed fl ush into the wall or fl oor. The valve should be controlled by a removable valve key for safety.
An ANSI approved manual shut-off valve, union and plugged
1
/
8
" NPT pressure tapping point must be installed
upstream of the heater.
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.
An external regulator must be used on all propane/L.P.G. heaters, in addition to the regulator fi tted to the heater, to reduce
the supply tank pressure to 13" w.c. (maximum). Any copper tubing used to supply propane / L.P.G. from the tank must be
internally tinned.
Note: When connecting propane / L.P.G. vent-free room heaters, you must use pipe sealant resistant
to propane / L.P.G.
Important: Hold heater regulator with a wrench to prevent movement when connecting to inlet piping.
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.
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.
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.
WARNING
Connecting directly to an unregulated
propane / L.P.G. tank can cause an
explosion.
WARNING
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 operating the unit).
WARNING

26D4721
13
CANOPY INSTALLATION
INSTALLING CANOPY
A canopy is furnished with each fi rebox and
MUST
be installed for safe operation.
See Figure 14.
1. Remove the three (3) screws from the top front frame assembly. Also remove the two (2) screws on the side frames.
See Figure 14.
2. Align the canopy with the holes in the top frame.
3. Replace the screws previously removed.
4. Tighten side screws. Make sure the canopy is level and
secure.
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 a decorative type unvented
room heater.
WARNING
Figure 14 - Installing Canopy

14
26D4721
4
2
1
3
OPTIONAL EQUIPMENT
AND
ILLUSTRATED PARTS LIST
OPTIONAL WIDE CANOPY
The optional wide canopy can be installed. See installation instructions provided with kit.
ITEM DESCRIPTION QTY
ITEM DESCRIPTION QTY
ITEM DESCRIPTION QTY
LCUF36B
1 Canopy 1 26D4568K
1 Canopy 1 26D4568K
1 Canopy 1 26D4568K
1 Canopy 1 26D4568K
2 Screen Panel 2 26D4563
2 Screen Panel 2 26D4563
2 Screen Panel 2 26D4563
2 Screen Panel 2 26D4563
3 Screen Rod 2 26D0132K
3 Screen Rod 2 26D0132K
3 Screen Rod 2 26D0132K
3 Screen Rod 2 26D0132K
ACCESSORIES IN KITS
1 Standard Brass Canopy 1 BRCU36
1 Standard Brass Canopy 1 BRCU36
1 Standard Brass Canopy 1 BRCU36
1 Standard Brass Canopy 1 BRCU36
1 Wide Brass Canopy 1 BRC36
1 Wide Brass Canopy 1 BRC36
1 Wide Brass Canopy 1 BRC36
1 Wide Brass Canopy 1 BRC36
4 Brass Trim Curved Design 1 BRTKM36
4 Brass Trim Curved Design 1 BRTKM36
4 Brass Trim Curved Design 1 BRTKM36
4 Brass Trim Curved Design 1 BRTKM36
4 Pewter Trim Curved Design 1 PWTKM36
4 Pewter Trim Curved Design 1 PWTKM36
4 Pewter Trim Curved Design 1 PWTKM36
4 Pewter Trim Curved Design 1 PWTKM36
4
Black Trim Curved Design
1 BLTM36
1 BLTM36
1 BLTM36
ITEM DESCRIPTION QTY
1 Canopy 1 26D4568K
2 Screen Panel 2 26D4563
3 Screen Rod 2 26D0132K
ACCESSORIES IN KITS
1 Standard Brass Canopy 1 BRCU36
1 Wide Brass Canopy 1 BRC36
4 Brass Trim Curved Design 1 BRTKM36
4 Pewter Trim Curved Design 1 PWTKM36
4

26D4721
15
NOTES

June 2004 P/N 26D4721 • Rev. 1
MONESSEN HEARTH SYSTEMS
LIMITED LIFETIME WARRANTY POLICY
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 qualifi ed 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)
fi rebox/burner assembly damage by accident, neglect, misuse, abuse, alteration, negligence of others, including
the installation thereof by unqualifi ed 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 fi tness 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