Lennox Hearth Products Radium-NG User manual

Report No. 317-S-04-5
INSTALLATION AND OPERATION MANUAL
Do not store or use gasoline or other flammable vapors or liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not light any appliance.
• Do not touch any electrical switches; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow your gas supplier's instructions.
• If your gas supplier cannot be reached, call the fire department.
Installation and service must be performed by a qualified installer, service agency or the gas supplier.
WARNING: 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.
WARNINGS
•Hot! Do not touch! This appliance will be hot during operation and will retain heat for a while after
shutting off the appliance. Severe burns may result.
• Carefully supervise children in the same room as appliance.
•Due to high temperatures, the appliance should be located out of traffic and away from furniture or
draperies.
• Do not place clothing or other materials on or near this appliance.
•Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to
this manual. For assistance or additional information consult a qualified installer, service agency or the gas supplier.
•Do not build a wood fire. Do not burn wood or other material in these appliances.
•This is an unvented gas log appliance. It uses air (oxygen) from the room in which it is installed. Provisions for adequate
combustion and ventilation air must be provided. Refer to Combustion and Ventilation Air Section in this manual.
• This appliance may be installed in an aftermarket, permanently located, manufactured (mobile) home, where
not prohibited by local codes.
• The appliance is only for use with the type of gas indicated on the rating plate. This appliance is not convertible
for use with other gases.
• Lennox™ vent-free appliances are designed for use as a supplemental heater. They are not intended for continuous
use as a primary heat source.
Catalytic Vent-Free
Wall-Mounted Gas Fireplace
P/N 850,054M REV. B, 03/2008
In the Commonwealth of Massachusetts:
• Installation must be performed by a licensed plumber or gas tter
• See Table of Contents for location of additional Commonwealth of
Massachusetts requirements
US
Installer: Leave This Manual With The Appliance.
Consumer: Retain This Manual For Future Reference.
Radium™
TM
Models: Radium-NG and Radium-LP
A Spanish manual is available upon request. Order P/N 850,054LS.
Este manual está disponible en espanol por solicitud. Pida P/N
850,054LS para la versión en espanol.

2
1.0 IMPORTANT SAFETY AND WARNING
INFORMATION
WARNINGS
If the information in this manual is not fol-
lowed exactly, a fire or explosion may result
causing property damage, personal injury
or loss of life.
IMPORTANT
Read and understand these instructions completely
before installing or operating your unvented room
heater.
• Children and adults should be alerted to the hazard of high
surface temperature and should stay away to avoid burns or
clothing ignition.
• Young children should be carefully supervised when they are
in the same room with the heater.
• Do not place clothing or other flammable material on or near
the heater.
• Any safety screen or guard removed for servicing the heater
must be replaced prior to operating the heater.
• Installation and repair should be done by a qualified service
person. The heater should be inspected before use and at
least annually by a professional service person. More fre-
quent cleaning may be required due to excessive lint from
carpeting, bedding material, etc. It is important that control
compartments, burners and circulating air passageways of
the heater be kept clean.
• Allow the heater to cool before servicing. Always shut off the
gas to the heater while performing service work.
• The installation must conform with local codes or, in the
absence of local codes with the National Fuel Gas Code,
ANSI Z223.1/NFPA 54-latest edition.
• The heater and its individual shut-off valve must be discon-
nected from the gas supply piping system while performing
any tests of the gas supply piping system at pressures in
excess of 1/2 psig.
• The heater must be isolated from the gas supply piping
system by closing its individual manual shut-off valve during
any pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 psig.
• Keep heater area clear and free from combustible materials,
gasoline and other flammable vapors and liquids.
• Do not use this heater if any part has been under water.
Immediately call a qualified 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.
• Input ratings are shown in BTU per hour and are for elevations
up to 4,500 feet. Do not install this heater at an elevation
above 4,500 feet if the gas supply has not been derated for
that elevation. Consult your local gas supplier. (For operation
at elevations above 4,500 feet, equipment ratings shall be
reduced at the rate of 4 percent for each 1,000 feet above
4,500 feet before selecting appropriately sized equipment).
When installing any vent-free appliance at elevations above
4500 feet, nuisance pilot outages may occur.
• Ensure that the heater is clean when operating. Excessive
dust accumulation on the burner will increase the amount
of carbon monoxide formation and could lead to carbon
monoxide poisoning and/or death.
• This appliance is intended for supplemental heating.
• Carbon monoxide poisoning – early signs of carbon monox-
ide poisoning resemble the flu with headaches, dizziness,
or nausea. If you have these signs, get fresh air at once!
Turn off the gas supply to the appliance and have the heater
inspected by a qualified service technician. Some people
are more affected by carbon monoxide than others. These
include pregnant women, people with heart or lung disease
or anemia, those under the influence of alcohol, and those
at high altitudes.
• Maintain minimum clearances.
• Do not install the appliance in a sleeping room or bath-
room.
WARNING
Failure to comply with the installation and operation
instructions provided in this document will result in
an improperly installed and operating appliance,
voiding its warranty. Any change to this appliance
and/or its operating controls is dangerous. Improper
installationoruseofthisappliancecancauseserious
injury or death from fire, burns, explosion or carbon
monoxide poisoning.
WARNING
Failure to keep the primary air opening(s) of the
burner(s) clean may result in sooting and property
damage.
WARNING
Do not allow fans to blow directly into the fireplace.
Avoid any drafts that alter burner flame patterns.
WARNING
Check gas type: The gas supply must be the same
as stated on the appliance’s rating plate. If the gas
supply is different DO NOT install the appliance.
Contact your dealer for the correct model.
WARNING
Do not use a blower insert, heat exchanger insert
or other accessory not approved for use with this
heater.

3
2.0 GENERAL INFORMATION
This appliance is a high efficiency, unvented, flame effect gas heater.
It provides radiant and convected warmth both efficiently and safely
utilizing the latest type catalytic convertor burner technology. The
appliance does not require a flue system of any type as the catalytic
converter cleans the flue products to provide a complete combustion
system, which is intrinsically safe.
3.0 PACKAGING LIST
Quantity Description
1 Firebox, Burner & Curved Rear Frame Assembly
1 Installation and operation instructions
1 Glass Facia Panel Assembly
1 Screw And Wall Plug Pack
1 Rubber Grommet
1 Fitting Template
1 Wall Mounting Plate
4.0 APPLIANCE SPECIFICATIONS
CONGRATULATIONS ON THE PURCHASE OF YOUR NEW
GAS APPLIANCE MANUFACTURED BY LENNOX HEARTH
PRODUCTS.
When you purchased your new gas fireplace, you joined the ranks of
thousands of individuals whose answer to their home heating needs
reflects their concern for efficiency and our environment. We extend our
continued support to help you achieve the maximum benefit and enjoy-
ment available from your new gas fireplace. It is our goal at Lennox Hearth
Products to provide you, our valued customer, with an appliance that will
ensure years of trouble-free warmth and pleasure.
Thank you for selecting a Lennox Hearth Products gas fireplace as the
answer to your supplemental home heating needs.
Sincerely, All of us at Lennox Hearth Products
TABLE OF CONTENTS
Section Contents Page No.
1.0 Safety And Warning Information . . . . . . . . . . . . . 2
2.0 General Information....................... 3
3.0 Packaging List ........................... 3
4.0 Appliance Specifications ................... 3
5.0 Burn-in Period ........................... 4
6.0 Codes, Massachusetts & New York ........... 4
7.0 Combustion And Ventilation Air. . . . . . . . . . . . . . 5
8.0 Site Requirements . . . . . . . . . . . . . . . . . . . . . . . . 6
9.0 Preparing The Appliance ................... 6
10.0 Mounting The Appliance ................... 7
11.0 Checking The Burner . . . . . . . . . . . . . . . . . . . . . . 8
12.0 Connecting A Gas Line .................... 8
13.0 Checking The Gas Connections . . . . . . . . . . . . . . 9
14.0 Gas Pressure Check....................... 9
15.0 Spark Gap .............................. 10
16.0 Fitting The Glass Facia. . . . . . . . . . . . . . . . . . . . . 10
17.0 Briefing The Customer. . . . . . . . . . . . . . . . . . . . . 10
18.0 Servicing ............................... 11
19.0 Servicing The Burner. . . . . . . . . . . . . . . . . . . . . . 11
20.0 Pilot Assembly........................... 11
21.0 Catalysts ............................... 12
22.0 Testing For Firebox Leakage ................ 12
23.0 Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
24.0 Lighting Instructions & Turning Off Appliance. . . 13
25.0 Troubleshooting Guide. . . . . . . . . . . . . . . . . . . . . 14
26.0 Replacement Parts List .................... 15
27.0 Positioning Of Field Assembled Parts ......... 16
28.0 Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
29.0 Product Reference Information . . . . . . . . . . . . . . 18
These heaters are fitted with a specially designed pilot utilizing an
oxygen depletion sensor (ODS) which responds to the amount of
oxygenavailableintheroomandshutstheheateroffbeforethe oxygen
level drops below 18%. The pilot can be relit only when fresh air is
available. Refer to the Combustion and Ventilation Air section.
The appliance is designed to fit various types of situations as listed
in the Installation Requirements.
This appliance is factory set for operation on the gas type, and at the
pressure stated on the appliance rating plate.
Readalltheseinstructionsbeforecommencinginstallation. Allinstruc-
tions must be handed to the user for safekeeping.
Gas Type Natural Gas Propane Gas (LP)
Gas inlet pressure Max.
Min.
10.5” w.c.
6” w.c.
13” w.c.
11” w.c.
Regulator Pressure Setting 5” w.c. 10” w.c.
Max Energy Input 8,870 BTU/hour 7,500 BTU/hour
Min Energy Input 5,110 BTU/hour 5,110 BTU/hour
Pilot Energy Input 560 BTU/hour 560 BTU/hour
Burner Pressure High
(manifold) Low
3.5” w.c.
1.1” w.c.
5.6” w.c.
2.9” w.c.
Main burner flow restrictor
(burner orifice)
1.45mm (0.057”) 1.03mm (0.04”)
Oxypilot SIT/Bray 9082 SIT/Bray 9284
Gas Inlet Connection 3/8” NPT at regulator 3/8” NPT at regulator
Ignition Piezo spark Piezo spark
Spark Gap 1/8” - 3/16” 1/8” - 3/16”
Please see Data Plate affixed to appliance for current data. This appliance is for use
only with the gas type, and at the pressure stated on the appliance Data Plate.
Table 1

4
THE FOLLOWING BOXED INFORMATION APPLIES TO REQUIRE-
MENTS FOR THE COMMONWEALTH OF MASSACHUSETTS.
Note: The following requirements reference various Massachusetts
and national codes not contained in this document.
Unvented Room Heaters shall be installed in accordance with 527
CMR 30.00 and 248 CMR 3.00 through 7.00:
(a) Permits and Inspections: In addition to complying with 248 CMR
3.05 the following requirements must be satisfied:
1. A permit shall be obtained from the head of the fire department and
the local or state gas inspector having jurisdiction for the installation
of all unvented propane or natural gas-fired space/room heaters.
2. The permits shall be conditioned upon final inspection and approval
of installation by the head of the fire department and the local or
state gas inspector having jurisdiction.
3. A copy of the manufacturer’s installation/operating literature shall
be submitted with each permit application.
4. Before operation, the Head of the Fire Department and the local
or state gas inspector shall inspect the installation for compliance
with 527 CMR (Board of Fire Prevention Regulations) and 248 CMR
(Board of State Examiners of Plumbers and Gas Fitters).
5. (a) A final inspection by the state or local gas inspector of the
unvented space/room heater shall not be performed until proof is
provided that the head of the fire department having jurisdiction
has granted a permit.
(b) Unvented natural gas-fired space/room heaters shall conform to
ANSI Z21.11.2, be equipped with an oxygen depletion safety (ODS)
shutoff system and be Product-approved in accordance with 248
CMR.
(c) Unvented natural gas-fired space/room heaters shall be installed
in accordance with their listings and the manufacturer’s instructions.
Proper clearances to combustibles shall be maintained. In no case
shall the clearances be such as to interfere with combustion air and
accessibility.
(d) Installations shall be of a permanent type, with a permanently
piped fuel supply in accordance with 248 CMR. LPG appliances
shall be subject to the storage requirements in accordance with
527 CMR 6.00. Portable unvented or natural gas-fired space/room
heaters shall be prohibited.
(e)Unvented naturalgas-firedspace/roomheatersshallbeprohibited
in bedrooms and bathrooms.
(f) Space/room heaters shall be properly sized for the room or space
of installation, but shall not exceed a maximum of 40,000 BTU input
per room or space.
(g) In occupancies with an unvented natural gas-fired space/room
heater, no less than one listed carbon monoxide detector that is
installed in accordance with the manufacturers instructions shall
be installed and maintained near the space where the heater is
located.
New York: This appliance is approved for installation in the U.S. state
of New York, but not New York City.
5.0 BURN-IN PERIOD
On initial light up of a new appliance, the ‘newness’ will burn off within
the first few hours of operation. During this period some smoke may be
emitted from outlet grill, this should be no cause for concern. Accord-
ingly, the room should be well ventilated with all windows and doors
open during this period.
Depending on your use, the burn-in period may take a few hours or a few
days. Also if you have a sensitive sense of smell you may notice slight
odors during operating after the burn-in period is over.
KEEP YOUR HOUSE WELL VENTILATED DURING THE BURN-IN PERIOD.
THE ODOR AND HAZE EMITTED DURING THE BURN-IN PERIOD CAN BE
QUITE NOTICEABLE AND MAY SET OFF A SMOKE DETECTOR. MAKE
SURE SMOKE DETECTORS ARE NOT TOO CLOSE TO THE FIREBOX
(CHECK WITH YOUR LOCAL CODE FOR ALLOWABLE DISTANCES).
6.0 CODES
Adhere to all local codes or in their absence the latest edition of The
National Fuel Gas Code ANSI Z223.1 / NFPA 54 - latest edition which can
be obtained from The American National Standards Institute, Inc. (1430
Broadway, New York, NY, 10018) or National Fire Protection Association,
Inc. (Batterymarch Park, Quincy, MA, 02269).
Seller of unvented propane or natural gas fired supplemental room
heaters in the Commonwealth of Massachusetts shall provide to each
purchaser a copy of 527 CMR 30 upon sale of the unit.
This Lennox Hearth Products Unvented Gas Room Heater is certified by
OMNI-Test Laboratories, Inc to ANSI Z21.11.2 standard.

5
7.0 COMBUSTION AND VENTILATION AIR
This heater shall not be installed in a confined space or unusually tight
construction unless provisions are provided for adequate combustion and
ventilation air. The heater may be located in unusually tight construction
provided the space is unconfined, or if confined, is provided with two
permanent openings communicating directly with an additional room(s)
of sufficient volume so that the combined volume of all connected spaces
meets the criteria for an unconfined space, (National Fuel Gas Code
NFPA 54 / ANSI Z223.1 - latest edition, Section on Air for Combustion
and Ventilation. Generally 50 ft3per 1,000 BTU input of all operating
appliances in the space.
The National Fuel Gas Code, ANSI Z223.1/NFPA 54, defines a confined
space as a space whose volume is less than 50 ft3per 1,000 BTU/Hr
(4.8 m3per kW) of the aggregate input rating of all appliances installed
in that space and an unconfined space as a space whose volume is not
less than 50 ft3per 1,000 BTU/Hr (4.8 m3per kW) of the aggregate input
rating of all appliances installed in that space.
Rooms communicating directly with the space in which the appliances
are installed, through openings not furnished with doors, are considered
a part of the unconfined space.
Unusually tight construction is defined as construction where:
a. Wall and ceilings exposed to the outside atmosphere have a continu-
ous water vapor retarder with a rating of one perm (6 X 10-11 kg per
pa-sec-m2) or less with openings gasketed or sealed;
b. Weather stripping has been added on operable windows and doors;
and
c. Caulking or sealants are applied to areas such as joints around window
and door frames, between sole plates and floors, between wall ceiling
joints, between wall panels, at penetrations for plumbing, electrical,
and gas lines, and at other openings.
Use the following equations to determine if you have a confined or
unconfined space.
1. Determine the volume of space — ft3.
Length x Width x Height = _____ ft3
(Include adjoining rooms with doorless passageways or ventilation
grills between rooms).
Example: 24' (L) x 16' (W) x 8' (H) = 3072 ft3
2. Divide the volume of space by 50 ft3to determine the maximum BTU/Hr
the space can support.
______ (volume of space – ft3)/ 50 ft3=
(Maximum BTU/Hr the space can support)
Example: 3072 ft3/ 50 ft3= 61.44
or 61,440 BTU/Hr the space can support.
3. Add the BTU/Hr of all the fuel burning appliances in the space.
Vent-Free heater _______ BTU/Hr
Gas appliance #1* _______ BTU/Hr
Gas appliance #2 + _______ BTU/Hr
Gas appliance #3 + _______ BTU/Hr
Total = _______ BTU/Hr
Example:
Vent-free heater #1 9,000 BTU/Hr
Vent-free heater #2 23,000 BTU/Hr
Gas appliance #1 35,000 BTU/Hr
(water heater)
Total = 67,000 BTU/Hr
* Do not include direct-vent gas appliances. Direct-vent is sealed com-
bustion and draws combustion air from the outdoors.
4. Compare the maximum BTU/Hr the space can support with the actual
amount of BTU/Hr used.
_______ BTU/Hr (max. the space can support)
_______ BTU/Hr (actual amount of BTU/Hr used)
Example:
61,440 BTU/Hr (max. the space can support)
67,000 BTU/Hr (actual amount of BTU/Hr used)
The space in the previous example is a confined space because the
actual BTU/Hr used is more than the maximum BTU/Hr the space can
support. You must provide additional fresh air.
Your options are:
a. Rework equations adding the space of adjoining room(s). If the extra
volume provides an unconfined space, then remove door or add
ventilation grills between rooms. Refer to National Fuel Gas Code,
ANSI Z223.1/NFPA 54-latest edition, Section "Air for Combustion and
Ventilation".
b. Vent room directly to the outdoors. Refer to National Fuel Gas Code,
ANSI Z223.1/NFPA 54-latest edition, Section "Air for Combustion and
Ventilation".
c. Install a lower BTU/Hr heater to make the area an unconfined space.
If the actual BTU/Hr used is less than the maximum BTU/Hr the space
can support, then the space is an unconfined space. You will need no
additional fresh air ventilation for an unconfined space.
WARNING
If the area in which the heater may be operated is
smaller than that defined as an unconfined space
or if the building is of unusually tight construc-
tion, provide adequate combustion and ventilation
air by one of the methods described in the national
fuelgascode,ANSIZ223.1/NFPA 54,AirforCombus-
tion and Ventilation Or applicable local codes.

6
8.0 SITE REQUIREMENTS
This appliance is designed to be wall-hung. Do not recess any part of
the appliance into the wall.
This appliance may be installed in any room in a home except bathrooms
- or areas where large amounts of steam are likely to be generated. This
appliance is approved for installation into a bedroom.
It should be noted that heaters create warm air currents. These currents
move heat to wall surfaces next to the heater. Installing the heater next
to vinyl or cloth wall coverings or operating the heater where impuri-
ties in the air (such as tobacco smoke or candle smoke) exist, may
discolor walls.
Installation in living rooms is common, however other rooms such as
kitchens, dining rooms and hallways are permitted, providing a suitable
gas supply is available, and rooms sizing and ventilation requirements
are strictly adhered to (see Section 7.0).
The appliance is designed to be versatile, and as such will operate correctly
when exposed to normal gentle drafts experienced within the home. It
is not recommended, however that the appliance be installed in areas
where it is likely to be exposed to persistent strong drafts, that may be
generated by outside doors or windows, air vents etc. It is recommended
that the appliance should not be installed within 20” of any air vent.
CLEARANCES TO NON-COMBUSTIBLES
Non-combustible surfaces are defined as brick, metal, marble, concrete
etc. and also a number of man-made materials impervious to flame. If in
doubt refer to the material manufacturer for further information before
proceeding with installation.
Clearances to the sides of the appliance are 4”. Clearance to the front
of the appliance is 20”.
The back of the appliance may be installed directly onto a non-combustible
wall, providing the area behind the appliance is flat and does not interfere
with the various vent holes in the back panel of the appliance.
The appliance may be installed with or without a non-combustible hearth.
If a hearth is fitted, the size and design may be as desired.
A non-combustible shelf of any depth may be positioned above the appli-
ance provided it is no closer than 16” from the top of the appliance glass
panel and the wall above the appliance is non combustible.
CLEARANCES TO COMBUSTIBLE MATERIALS
Combustible materials are defined as wood, fabrics, or other materials
likely to combust if exposed to flame. Generally, any material, which is
likely to discolor, melt or misshape when exposed to moderate heat,
should be considered as a combustible material or surface.
Clearance to the sides of the appliance are 4” but curtains, drapes and
other fabrics are not permitted within a distance of 20” of the appliance
sides. No such materials are permitted directly above the appliance
regardless of distance.
The minimum clearance to the ceiling above the appliance is 32” measured
from the top of the appliance glass panel.
Combustible materials should not be positioned directly in front of the
appliance within a distance of 40”.
Under no circumstances should any electrical equipment e.g. plasma
screen TV sets etc. be positioned on the wall above the appliance. The
appliance is designed to be wall mounted alone and not in conjunction
with any type of combustible fire surround.
9.0 PREPARING THE APPLIANCE
The curved rear frame is supplied pre-assembled to the appliance - no
further preparation is necessary. Remove the wall mounting plate from
the appliance by removal of the two wing-nuts located in the lower inner
section of the firebox.
Follow the steps below:
Gas connection: The heater gas inlet connection is 3/8” NPT at the
regulator, located below the burner, in the right hand side of the heater.
There are four possible entry points for the gas supply pipe-work to
enter the appliance firebox. These entry points are ‘knock out’ type holes
(shown in Figure 1).
No combustible shelves should be positioned on the wall above the
appliance.
It should be established that any mirrors or picture frames etc. to be
positioned on the wall above the appliance are able to withstand pro-
longed exposure to moderate heat and moisture before proceeding with
their installation.
The wall must be structurally sound and constructed from a material
capable of withstanding moderate heat. Finished plaster, conventional
wall paper and dry-lined plasterboard are examples of suitable materi-
als. Materials such as flock, blown vinyl and embossed paper which are
sensitive to even small amounts of heat should be avoided as scorching
and or discoloration may occur over time.
If the appliance is to be mounted on a dry-lined wall or a timber framed
construction wall then the integrity and ability of the wall to carry the
weight of the appliance must be confirmed. It is important in these cir-
cumstances that any vapor control barrier is not damaged, and that any
structural members of the house frame are not damaged.
The appliance may be positioned as close to a solid floor (i.e. stone,
wooden laminate etc.) as the particular design of fire frame permits,
however it is not permitted to install the appliance within 4” of carpet,
rugs or fabric materials of any kind. This dimension is measured verti-
cally to the bottom of the appliance frame.
Figure 1 - Gas Supply Entry Points

7
After having selected the final mounting position of the appliance,
taking into account the site requirements as specified in Section 8 of
these instructions, the integrity of the wall, and the feasibility of the
proposed supply pipe routing, the firebox of appliance may be secured
to the wall..
10.0 MOUNTING THE APPLIANCE
Non-concealed gas connections may be made using the entry points
at either end of the firebox or the one in the bottom of the firebox. A
concealed gas connection may be made using the knock out hole in the
center back of the firebox. Select the most appropriate entry point and
knock out the relevant hole.
If a concealed gas connection is to be made, the supply pipe should always
be sleeved through walls and floors using the shortest possible route.
For concealed supply pipe routing, pipes must (where possible) be ver-
tical and providing there is sufficient wall thickness available, they should
be placed in pipe chases. Horizontal pipe runs should be avoided where
possible. Prior to chasing a solid wall, an inspection should be made
to note the proximity of any cables/sockets outlets which may already
be buried. Pipes must be secured using suitable clips and protected
againstcorrosion.Ideally factory finishedprotectedpipe-workandfittings
should be used. Joints should be kept to a minimum and compression
fittings must not be used. The pipe-work installation must be tested for
soundness before any protection is applied and/or the pipe-work and
fittings are buried.
WARNING
The wall where the appliance is to be installed must
be capable of long-term support of the total load of
the appliance. Measures should also be taken to
ensure sufficient strength to withstand the force of
earthquakes, vibration and other external forces.
To ensure customer safety, be sure to design the installation so that the
strength of both the wall and any wall fixings used are sufficient. Lennox
Hearth Products assumes absolutely no responsibility for injuries and
damages that may occur due to improper installation or handling.
The appliance should not be installed until all dry wall sanding and wall
painting has been completed.
Incorrect installation can cause the appliance to fall from the wall and
cause injury. Do not block the ventilation holes of the appliance. The
wall onto which the appliance is installed must be flat. Install only on a
vertical surface. Avoid sloped surfaces. Installation onto anything other
than a vertical wall may result in fire, damage or injury.
A full size fitting template is supplied to assist with wall mounting.
If the heater is to be installed on a studded wall with conventional 16”
stud spacing then a wall mounting plate is supplied to enable this. First
locate the studs and using suitable fixings, screw the mounting plate to
the wall via the four mounting holes. The heater may then be hung onto
the mounting plate. The bottom of the heater may be secured onto the
lower mounting studs using the wing-nuts or the hex nuts provided.
Mark the positions shown as “Fixing Points” on the wall. If the appliance
is to be mounted on the inner leaf of a conventional cavity wall, or a solid
wall, drill four holes using a 5/16" masonry bit, to a depth of 1-11/16".
Insert the wall plugs provided.
If the appliance is to be mounted on a dry lined wall or a timber framed
construction wall then special cavity screw fixings will be required which
are not supplied with this product. These should be constructed from
metal and not plastic.
If a concealed gas connection is to be made ensure the gas supply pipe
is in it’s final position and can enter the appliance in the correct position
when the appliance is hung on the wall.
Radium
™
18” (457mm)
13-3/4” (350mm)
IMPORTANT
THIS APPLIANCE IS TO BE WALL HUNG ONLY.
DO NOT RECESS OR INSET ANY PART OF THE APPLIANCE.
THIS TEMPLATE IS FOR THE MARKING OF FIXING POINTS ONLY.
DO NOT INSTALL THE APPLIANCE WITH THIS TEMPLATE IN PLACE.
FIREBOX OUTLINE
CONTORNO DE LA CAMARA DE COMBUSTION
POSITION SPIRIT LEVEL ALONG THIS EDGE TO LEVEL TEMPLATE BEFORE MARKING OUT WALL
COLOQUE EL NIVEL SOBRE ESTE BORDE PARA NIVELAR LA PLANTILLA ANTES DE MARCAR LA PARED
PIERCE TEMPLATE TO MARK HOLE POSITION ON WALL X 4
CENTRE LINE
17-3/16” (437mm)
CONCEALED
GAS INLET
ENTRADA DE
GAS OCULTA
1/2”
(13mm)
16” (406mm)
FIXING POINTS: WHEN MOUNTING PLATE IS NOT USED
IMPORTANTE
ESTE APARATO UNICAMENTE DEBE SER COLGADO EN UNA PARED.
NO EMPOTRE NINGUN ELEMENTO DE ESTE APARATO.
ESTA PLANTILLA SIRVE UNICAMENTE PARA MARCAR LOS
PUNTOS DE FIJACION.
RETIRE LA PLANTILLA ANTES DE COLOCAR LE APARATO.
PERFORE LA PLANTILLA PARA MARCAR LA POSICION DE LOS 4 TALADROS EN LA PARED
PUNTOS DE SUJECION: SI NO SE UTILIZA LA PLACA DE MONTAJE
LINEA DE CENTRO
FIXING POINTS: MOUNTING PLATE USED (16” STUD SPACING)
PUNTOS DE SUJECION: PLACA DE MONTAJE (ESPACIADO ENTRE MONTANTES DE 406mm)
PIERCE TEMPLATE TO MARK HOLE POSITION ON WALL X 4
PERFORE LA PLANTILLA PARA MARCAR LA POSICION DE LOS 4 TALADROS EN LA PARED
FIXING POINTS: WHEN MOUNTING PLATE IS NOT USED
PUNTOS DE SUJECION: SI NO SE UTILIZA LA PLACA DE MONTAJE
FIXING POINTS: MOUNTING PLATE USED (16” STUD SPACING)
PUNTOS DE SUJECION: PLACA DE MONTAJE USADA
(ESPACIADO ENTRE MONTANTES DE 406mm)
WALL MOUNTED VENT FREE FITTING TEMPLATE
PLANTILLA PARA LA INSTALACION DE CHIMENEAS DE PARED SIN SALIDA DE HUMOS
APPLIANCE OUTLINE CONTORNO DE LA APARATO
Figure 2
(RS) Revise "fiber wall plug" to read "wall plug" . The correct sized hole that
the installer will need to drill (if he is going to use the plugs) is diameter
8mm to a depth of 42mm. (done 1-29-08)

8NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE
Insert the wall mounting screws into the top wall plugs, taking
care to leave the screws protruding approximately 3/8” from the
wall. Now hang the appliance onto these screws through the two
keyhole shaped holes in the back panel of the appliance.
Insert the lower mounting screws into the lower wall plugs
through the corresponding depressed holes in the lower part of
the back panel. Do not tighten fully.
Before tightening the wall mounting screws fully, at this stage
it is recommended to check the horizontal alignment of the
appliance with a bubble level, as small adjustments can still be
made if necessary. When this has been checked, tighten all four
fixing screws fully.
To access the upper fixing screws insert a screwdriver through
the holes in the deflector plates above the catalyst as shown in
Figure 3.
11.0 CHECKING THE BURNER
There are no imitation fuel bed components to install. The
appliance features a ribbon burner which is designed to produce
a continuous band of flame over its length. The burner should be
visually inspected to ensure it is free from any foreign matter. If
it is necessary to clean or dust off the burner then the glass door
should be removed by removal of the four retaining screws. Re-
fit the glass door after cleaning or inspection, ensuring a good
seal.
12.0 CONNECTING A GAS LINE
10.0 MOUNTING THE APPLIANCE - continued
Figure 3
A qualified gas appliance installer must connect the gas room
heater to the gas supply. Consult all local codes.
The installer must provide an ANSI approved manual shut off
valve, flex connector and 3/8" NPT fitting.
Route gas line using techniques and materials prescribed by
local and/or national codes. Only use pipe of 1/2" or greater size
to allow full gas volume to the gas fireplace. Undue pressure
loss will occur if the pipe is too small.
An external regulator must be used on all propane (L.P.G.)
heaters, in addition to the regulator fitted to the heater, to reduce
the supply tank pressure to 13" w.c. (maximum).
Regulator
Manual
Shut-Off
Valve
Union
Sediment
Trap
Fireplace or
Firebox Wall
Wall
Shut-Off
Key
Fireplace or
Firebox Wall
Down
3"
Figure 4
WARNING
Connectingdirectlytoaunregulatedpropane(L.P.G.)
tank may cause an explosion.
An ANSI approved manual shut-off valve and union must be
installed upstream of the heater within the fireplace cavity
when rigid pipe is used. Ensure that a sediment trap is installed
upstream of the heater (Figure 4)within the structure’s piping
system to prevent moisture and contaminants from passing
through the pipe to the heater controls and burner. Failure to do
so could prevent the heater from operating reliably.
The heater gas inlet connection is 3/8” NPT at the regulator,
located below the burner, in the right hand side of the heater.
When tightening up the joint to the regulator hold the regulator
securely with a wrench to prevent the regulator from moving.
IMPORTANT
Holdheaterregulatorwithawrenchtopreventmove-
ment when connecting to inlet piping.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE 9
13.0 CHECKING THE GAS CONNECTIONS
Turn on gas supply and test for gas leaks using a gas leak test solution
(also referred to as bubble leak solution).
NOTE: using a soapy water solution (50% dish soap, 50% water) is
an effective leak test solution, but it is not recommended, because the
soap residue that is left on the pipes/fittings can result in corrosion
over time.
A. Light the appliance (refer to the lighting instructions label in the control
compartment or on Page 13).
B. Brush all joints and connections with the gas leak test solution to
check for leaks. If bubbles are formed, or gas odor is detected, turn
the gas control knob (off/pilot/on) to the “OFF” position. Either tighten
or refasten the leaking connection, then retest as described above.
C. When the gas lines are tested and leak free, be sure to rinse off the
leak testing solution.
D. Observe the individual tongues of flame on the burner. Make sure all
ports are open and producing flame evenly across the burner. If any
ports are blocked, or partially blocked, clean out the ports.
14.0 GAS PRESSURE CHECK
The heater regulator controls the burner pressure which should be
checked at the pressure test points located on the control valve itself
(shown in Figure 5)for burner (manifold) and regulator (inlet) setting
pressures.
Burner (Manifold) Pressure
WARNING
Never use an open flame to check for leaks.
Figure 5 - Manifold and Inlet Pressure Taps
Regulator (Inlet)
Pressure Setting
The valve is found on the center of the appliance behind the valve
cover. Remove the cover plate by unscrewing the four retaining screws.
Release the test point screws and ensure operating pressures are as
specified in Table 1 on Page 3 of these instructions. The pressure
should be checked with the gas heater burning and the control set to
high flame.
The pressure regulator on manual models is preset and locked to avoid
tampering. If the pressure is not as specified in Table 1 on Page 3,
replace the regulator with P/N H6063 for Natural Gas units and H7001
for Propane Gas units. Replace the test point screws after pressure
measurement ensuring no gas leaks. All instructions must be handed
to the user for safekeeping.

10
15.0 SPARK GAP
The gap between the spark electrode and the pilot should be 1/8” to
3/16” to produce a good spark. There should be no need to adjust
this. If under any circumstances the piezo electric spark fails, the pilot
cannot be lit manually.
16.0 FITTING THE GLASS FACIA
The glass panel is supported by two self-locking M6 screws, one on
each side of the fireplace. The glass panel must be held in position
while the screws are inserted on each side - it is recommended to seek
assistance for this operation. See Figure 7a. The screws should be
screwed in fully and then undone one turn to allow the glass panel to
swing open for access to the controls.
The appliance features a piston damper hinge assembly. The damper
assembly should be fitted onto the rear of the glass facia, on the lower
right hand side as follows:
Figure 7a - Glass Panel
17.0 BRIEFING THE CUSTOMER
WARNING
Do not add logs or ornaments such as pine cones,
vermiculite or rock wool. Using these added items
can cause sooting.
All instructions must be handed to the user for safekeeping. Show the
customer how to light and control the fire. Show the customer how to
remove and replace the glass facia.
After commissioning the appliance, the customer should be instructed
on the safe use of the appliance and the need for regular servicing. Fre-
quency of service depends on usage, but MUST be carried out at least
once annually. Advise that cleaning of the fire may be achieved when the
fire is cold using a damp cloth and mild detergent on most surfaces.
Advise that the fire will emit a "newness" smell for a time after initial
commissioning and that extra ventilation may be needed during this
time. Recommend that a guard be used for the protection of the young,
pets, the elderly and the infirm.
A periodic visual check of the pilot flame and the burner flame should
be carried out.
1) Ensure that the piston portion of the damper is positioned as shown
in Figure 7b. Remove the Philips screw securing the frame, and fit the
lower piston bracket to the frame and fully re-tighten the screw.
Now fit the lower piston bolt through the hole in the bracket, with the
two nylon washers positioned either side of the bracket. Finally, attach
the “nyloc nut” to the damper thread, tighten and then release one
quarter turn. Check that the assembly can swivel.
The glass panel is
supported by two
self-locking M6
screws, one on
each side
Damper
Figure 7b
Fixing
hole
Figure 7c
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE
Figure 6 - Proper Spark Gap
1/8" to 3/16" Spark Gap

11
19.0 SERVICING THE BURNER
WARNING
Any change to this heater or its controls can be
dangerous.
First, remove the front glass facia as described in Section 16.0 only in
reverse, remove the valve cover (4 screws) and disconnect the gas con-
nection inside appliance. The gas connections to the gas valve can now
be released. Undo the four screws retaining the burner brackets to the
base and rear of the firebox. The burner may now be removed.
Remove the pilot and main burner pipes and blow through to dislodge
any debris. Now remove the in line restrictor and blow through to make
sure it is entirely clear.
Unclip the pilot lint gauze and clean with a soft brush. Clean the exterior of
the pilot assembly with a soft brush and blow through the flame ports on
the pilot head. Check the aeration holes are free from lint or dirt. The pilot
assembly can be removed if required by disconnecting the electrode HT
lead, gas pipe, thermocouple lead and unscrewing the mounting screws
and lifting away. The pilot assembly is a non-serviceable item and should
not be taken apart. Aeration holes must be absolutely clear internally
for proper operation. NEVER MODIFY OR BEND THE THERMOCOUPLE
TO MAKE THE PILOT STAY LIT. Modifications are dangerous and can
have serious unseen effects on safety. If the pilot will not stay lit there
is a problem with dirt, the gas supply to it, or the thermocouple needs
replacement.
The gas valve is a non-serviceable item. If this needs replacement, remove
the cover plate then the securing screw holding the valve bracket in place,
remove all pipe unions, and the complete valve. Replacement must be
original manufacturers parts.
Re-assemble in the reverse of removal. Ensure setting pressures are as
stated in Table 1 on Page 3.
20.0 PILOT ASSEMBLY
WARNING
No adjustments are to be made to the ODS pilot
system.Tamperingwiththissystemcanbeextremely
hazardous.
Remove the glass facia, glass panel and burner unit (as per servicing sec-
tion), lint arrestor and pilot assembly by using a screwdriver to remove
the retaining screws.
Clean the pilot assembly with a soft brush and blow through. Check the
aeration holes are free of any dirt or lint. Clean thoroughly internally,
the connection can be removed from the base of the pilot assembly
using two spanners to make cleaning easier. Do not damage or try to
dismantle the pilot injector. The unit is factory set and the only check
necessary is to ensure the spark gap is correct. See Table 1 on Page
3 for gas setting.
NEVER MODIFY OR BEND THE THERMOCOUPLE TO MAKE THE PILOT
STAY LIT. If the pilot will not stay lit there is a problem with dirt, the
gas supply, or the thermocouple needs replacement. Modifications are
dangerous and can have a serious unseen effect on safety and therefore
MUST not be done. Replacements must be original manufacturers parts.
Re-assemble in the reverse of removal. Ensure setting pressures are as
stated in Table 1 on Page 3.
Turn off the fireplace at the gas supply. Ensure that the fireplace is fully
cold before attempting service. A suggested procedure for servicing
is detailed as follows;
1. Lay out the dustsheet and tools.
2. Remove the front glass facia as described in Section 16.0, only in
reverse.
3. Remove the glass door assembly (4 screws) and clean carefully.
Remove the valve cover plate (4 screws).
4. Inspect the burner and the catalysts and clean if necessary with a
soft brush.
5. Disconnect the gas supply.
6. Undo the four screws retaining the burner support brackets.
7. Remove the burner unit, strip off the burner pipes and clean thor-
oughly.
8. Clean the in-line restrictor, pilot assembly and the burner tube. Do
not attempt to remove the pilot injector as this can cause damage.
9. Re-assemble components.
10.Re-connect the gas supply. Turn on the gas supply and perform a
gas leak test using gas leak test solution. Check pilot and burner for
good ignition.
11.Refit the valve cover and retaining screws.
12.Refit the glass door assembly.
13.Refit the facia as described in Section 16.0.
14.Check the purpose provided ventilation is unobstructed.
15.Light the fire and test setting pressures.
16.Check safe operation of the appliance.
For specific servicing instructions, see relevant sections.
18.0 SERVICING
WARNING
Turn off the appliance and allow to cool before cleaning.
Verify proper operation after servicing.
WARNING
You must keep control areas, burners and circulating air
passageways of appliance clean. Failure to keep the
primary air opening(s) of the burner clear may result
in sooting and property damage. Inspect these areas of
appliance before each use. Have appliance inspected
yearly by a qualified service person. Appliance may
need more frequent cleaning due to excessive lint form
carpeting, bedding material, etc.

12 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE
21.0 CATALYSTS
WARNING
Donotblockthecatalystsortheapplianceoutletgrill.
Blockage may cause high carbon monoxide levels
and/or breakage of the glass facia panel.
It is recommended that the catalysts are inspected for signs of damage
and dirt during routine servicing procedures. The expected life of the
catalysts is in excess of 11,000 hours (10 years of normal use). After
this time the catalyst should be replaced.
If there are any deposits of dirt or soot on the catalysts they should be
cleaned with a soft brush and a vacuum cleaner. If removed for cleaning
ensure the seals are in good condition before replacing the catalyst. New
seals will usually be required.
The performance of the catalyst may be checked using a combustion
gas analyzer as follows.
Important: The temperature of the gases emitted by the catalytic
converters is in excess of 700° F. Measuring gas of this temperature
may damage some types of gas analyzers. If in doubt consult the
equipment manufacturer.
Turn on the fireplaceasperthe operatinginstructions, andrunatmaximum
setting for 15 minutes. Position gas sample probe directly over a catalyst
via the outlet grill, on top of the appliance. Record the carbon dioxide
(CO2) concentration and then the carbon monoxide (CO) concentration
as displayed by the analyzer - also noting the units in which the values
are expressed. Most analyzers display carbon dioxide (CO2) concentra-
tions in percentage (%) terms and carbon monoxide concentration in
parts per million (ppm) terms.
In order to calculate the combustion ratio for the appliance (CO/CO2)
it is first necessary to express both gas concentrations in terms of per-
centage. To convert from parts per million (ppm) to a percentage (%)
divide the ppm figure by 10,000. Examples : 35ppm = 0.0035%, 15ppm
= 0.0015%, 5ppm = 0.0005%.
Now divide the concentration of carbon monoxide (CO) expressed in
percent by the concentration of carbon dioxide (CO2) to obtain the
appliance combustion ratio.
CO (%)
CO2(%) = ratio
The combustion ratio of the gasses emitted by the catalytic convertor
should not exceed 0.0015.
If replacing, firstly, remove the glass facia as described in Section 16.0.
The catalysts are located on the top of the internal firebox and can be
removed be unscrewing the retaining nuts securing the clamping plate.
Remove the catalysts and seals and discard.
Refit a new catalysts and seals in reverse order, ensure the catalysts
and door have good seals.
22.0 TESTING FOR FIREBOX LEAKAGE
Appliances that are several years old or have been extensively dismantled
should be checked for soundness. It is important that all the products
of combustion pass through the catalytic converters at the top of the
firebox before leaving the appliance.
The firebox is heated by lighting for a few minutes to provide a flow
through the firebox. The burner is then shut off and a smoke pellet or
match introduced at the base of the fire underneath the burner tray. Large
quantities of smoke will emerge from the top of the appliance, but none
should emerge from the joints or gasket faces, especially around the
door. It is important to note that the appliance can never be expected
to be 100% smoke tight and small quantities of smoke may be seen in
corners of joints and gasket faces etc without affecting safety when the
fire is in operation.
23.0 CLEANING
GLASS PANEL -This can be cleaned with a suitable glass cleaner. The
following solutions are approved for use to clean glass.
• Non-ammonia based household cleaner
• 50% -50% mix of white vinegar and water
• Gas fireplace/stove glass cleaner
Test on a small area first.
PAINTED AREAS - These can be cleaned using a dry cloth.
FINISHED METAL AREAS - These can either be cleaned using a proprietary
metal cleaner or baby oil. Test on a small hidden part before cleaning.
Always clean in the direction of the grain.
WARNING
Do not operate the appliance with the catalyst units
removed.
DO NOT BLOCK THESE AREAS
Figure 8 - Catalysts and Outlet Grill

13
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING: IF YOU DO NOT FOLLOW THESE INSTRUCTIONS EXACTLY, A FIRE OR EXPLOSION MAY
RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.
A. This appliance has a pilot which must be lit with a piezo spark
igniter. When lighting the pilot, follow these instructions exactly.
B. BEFORE OPERATING smell all around the heater area for gas. Be
sure to smell next to the floor because some gas is heavier than
air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric 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 fire department.
C. Use only your hand to push in or turn the gas control knob.
Never use tools. If the knob will not push in or turn by hand, do
not try to repair it, call a qualified service technician. Forced or
attempted repair may result in a fire or explosion.
D. Do not use this heater if any part has been under water.
Immediately call a qualified service technician to inspect the
appliance and to replace any part of the control system and any
gas control which has been under water.
LIGHTING INSTRUCTIONS
1. Stop! Read the safety information above.
2. Make sure manual shut-off valve is fully open.
3. Open the glass facia.
4. Depress control knob in and turn clockwise to the
“OFF” position (Figure 9).
5. Wait 5 minutes to clear out any gas. Then smell for gas, including near
the floor. If you smell gas, STOP! Follow the safety instructions in “What to
do if you smell gas” under section ‘B’ above. If you do not smell gas, go to
next step.
6. The pilot is located on the left side behind the burner (Figure 10).
7. Depress control knob in and turn counter-clockwise to the
“SPARK” position (Figure 9) and hold there for a few seconds.
Note: If you are running the heater for the first time or after an extended
period of non use it will be necessary to press the control knob all the way
in for 30 seconds to allow air to bleed out of the gas piping.
8. Continue turning counter-clockwise through the spark click
to the PILOT light position, ensuring the pilot has lit. If not, turn the knob
fully clockwise, and repeat.
9. Hold the control knob in for a further 10 seconds to prevent the flame
failure detector from shutting off the gas while the probe is warming up.
10. Release the control knob while turning counter-clockwise
to the preferred setting. Close the glass facia.
• If the knob does not pop out when released, stop and immediately call your
service technician or gas supplier.
• If the pilot will not stay lit after several tries, depress and turn the gas
control knob clockwise to “OFF” and wait 30 seconds. Depress
and turn knob counter-clockwise to “SPARK” and ignite the
heater again. If your pilot does not relight depress and turn control knob
clockwise to “OFF” and call your service technician or gas
supplier.
11. Wait 30 seconds before readjusting the heater when the control knob has
been turned down to a lower setting.
TO TURN OFF GAS TO APPLIANCE
Figure 10: Pilot assembly. This is located
behind the burner, on the left-hand side of
the appliance.
Figure 10
Figure 9 :Control knob. This is located
behind the glass facia panel of the
appliance.
24.0 LIGHTING INSTRUCTIONS & TURNING OFF APPLIANCE
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE
Figure 9
1. Open the glass facia. 2. Depress and turn control knob clockwise to the “OFF”
position (Figure 9). Close the control access panel.

14
25.0 TROUBLESHOOTING GUIDE
PROBLEM CORRECTIVE ACTION
Igniter sparks but pilot does not light • No gas to Pilot, check the gas line connections.
• Air not fully purged. Purge supply or wait longer.
• Spark grounding to metal work, reset gap correctly.
• Blocked pilot, clean out internally.
Pilot lights but then goes out •Severe restriction in gas supply: clear obstruction.
•Faulty thermocouple, replace pilot assembly.
•Blocked pilot, clean out.
•Blocked lint gauze, clean.
•Hold control knob in for longer.
•If the pilot will not stay lit there is a problem with dirt, the gas supply, or
the thermocouple needs replacement. Modifications are dangerous and
can have a serious unseen effect on safety. NEVER MODIFY OR BEND THE
THERMOCOUPLE TO MAKE THE PILOT STAY LIT.
Igniter electrode at pilot does not spark • HT lead detached,refit.
• Check the spark gap (see Section 15.0).
• Faulty piezo unit, replace.
• Debris shorting out electrode, clean.
• Spark shorting to metalwork under tray, realign HT lead.
The burner stays on for a period of time,
then cuts off
• Loose or faulty thermocouple, rectify.
• Blocked pilot, clean out.
• Dirt or lint in pilot aeration hole or on the lint gauze, clean thoroughly.
• If the pilot will not stay lit there is a problem with dirt, the gas supply, or
the thermocouple needs replacement. Modifications are dangerous and
can have a serious unseen effect on safety. NEVER MODIFY OR BEND THE
THERMOCOUPLE TO MAKE THE PILOT STAY LIT.
Pilot flame shrinks when fire is on high • Poor gas flow to fire, check pressure with fire on high.
• If pressure is low, remove any restriction in pipe-work or valve.
• Check all pipe-work are adequately sized.
• Check meter pressure is adequate.
• If the pilot will not stay lit there is a problem with dirt, the gas supply, or
the thermocouple needs replacement. Modifications are dangerous and
can have a serious unseen effect on safety. NEVER MODIFY OR BEND THE
THERMOCOUPLE TO MAKE THE PILOT STAY LIT.
Fireplace smells when first lit or in use • Newness smell from brand new appliance.
• Leakage occurring. Carry out leakage test and rectify any problems.
• Combustible materials used in incorrect positions.
• Unit may require a service to remove dust from catalysts.

15
26.0 REPLACEMENT PARTS - RADIUM™
11
8
1
14
11
13
6
7
12
8
3
5
4
2
910
Item # Cat. No. Description
1 H6055 Glass Door Assembly
2 H7039 Gas Valve
3 H6060 Catalyst
4 H6061 Pilot Assembly, Natural Gas
5 H6999 Pilot Assembly, Propane Gas
6 H6056 Burner Assembly, Natural Gas
7 H7000 Burner Assembly, Propane Gas
8 H6062 Catalyst Gasket
9 H6063 Inlet Pressure Regulator, Natural Gas
10 H7001 Inlet Pressure Regulator, Propane Gas
11 H6066 Decorative Glass Facia
12 H6067 Decorative Rear Frame
13 H7004 Gas Strut
14 H7005 Knob, Reduced Height
15 H7006 Hardware Kit - common fasteners, ceramic
clip and rubber bung
See ordering instructions on Page 18
15
Hardware

16
Figure 12
27.0 POSITIONING OF FIELD REMOVABLE PARTS
WARNING
Failure to position the parts in
accordance with these diagrams
orfailuretouseonlypartsspecifi-
cally approved with this heater
may result in property damage
or personal injury.
Figure 13
4 off burner
installation
positions
Figure 11
Removal and refitting of
glass door assembly and
burner assembly.
Visual check for cor-
rect pilot flame.
The glass panel is
supported by two
self-locking M6
screws, one on
each side
Damper
Fixing
hole
Removal and refitting of the decora-
tive glass facia (see Section 16.0)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE 17
28.0 NOTES

Printed in U.S.A. © 2007 Lennox Hearth Products
P/N 850,054M REV. B 03/2008
Lennox™ reserves the right to make changes at any time, without notice, in design, materials,
specifications, prices and also to discontinue colors, styles and products. Consult your local
distributor for fireplace code information.
1110 West Taft Avenue • Orange, CA 92865
WARRANTY
Your gas appliance is covered by a limited warranty. Please read the
warranty to be familiar with its coverage.
Retain this manual. File it with your other documents for future refer-
ence.
PRODUCT REFERENCE INFORMATION
We recommend that you record the following important information about
your appliance. Please contact your Lennox Hearth Products dealer for
any questions or concerns. For the number of your nearest Lennox Hearth
Products dealer, please call 1-800-9-LENNOX.
REPLACEMENT PARTS
See Page 15 for a complete replacement parts list. Use only parts sup-
plied from the manufacturer.
Normally, all parts should be ordered through your Lennox distributor or
dealer. Parts will be shipped at prevailing prices at time of order.
When ordering repair parts, always give the following information:
1. The model number of the appliance.
2. The serial number of the appliance.
3. The part number.
4. The description of the part.
5. The quantity required.
6. The installation date of the appliance.
If you encounter any problems or have any questions concerning the
installation or application of this system, please contact your dealer.
LENNOX HEARTH PRODUCTS
1110 West Taft Avenue
Orange, CA 92865
Visit us at www.Lennox.com
Your Appliance's Model Number _______________________________________
Your Fireplace’s Serial Number ________________________________________
The Date On Which Your Fireplace Was Installed___________________________
The Type of Gas Your Fireplace Uses ____________________________________
Your Dealer's Name _________________________________________________
Fuel Type c Natural Gas c Propane Gas
29.0 PRODUCT REFERENCE INFORMATION