Monessen Hearth NB18 User manual

READ AND SAVE THESE INSTRUCTIONS
UNVENTED GAS LOG
HEATER or
VENTED DECORATIVE
APPLIANCE
INSTALLATION AND OPERATING
INSTRUCTIONS
This is an unvented gas-fired
heater. It uses air (oxygen)
from the room in which it is
installed. Provisions for adequate
combustion and ventilation air
must be provided.
Refer to page 7.
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 flammable
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.
• Immediatelycallyourgassupplierfromaneighbor's
phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire
department.
– Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
This appliance may be installed
in an aftermarket, permanently
located, manufactured (mobile)
home, where not prohibited by
local codes.
This 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.
MODEL: NB18, NB24
Natural Gas or Liquid Propane
Control Type: Millivolt

2 81D0107
CONTENTS
Important Safety Information ..................................3
Getting Started..........................................................5
Product Features and Specifications ....................6
Natural Gas .........................................................6
Propane/LPG.......................................................6
Ignition Controls...................................................6
Pilot/ODS.............................................................6
Thermal Generator..............................................6
General Installation Information ............................7
Codes..................................................................7
Adequate Combustion and Ventilation Air ...........7
Fireplace and Hearth Dimensions ..........................9
Placement in a Fireplace
with a Restrictive Barrier.......................................10
Clearances and Height Requirements .................11
Floor Clearance .....................................................16
Fireplace Preparation ............................................17
Installing Vented Applications .............................18
Connecting the Gas ...............................................19
Checking Gas Pressure ........................................20
Millivolt...............................................................20
Electrical Wiring (Millivolt).....................................21
Connecting Remote Receiver............................22
Checking System Operation..............................22
Berkley Oak Log Placement .................................23
Ember, Grate, and Rock Installation.....................25
Optional Cast Iron Grate
and Andirons Installation................................25
Flame Appearance..................................................26
Checking Burner Flames ......................................27
Operating Instructions...........................................28
For Your Safety Read Before Lighting ...............28
Millivolt Control Lighting Instructions .................29
Match Lighting Instructions................................30
Cleaning Instructions.............................................30
Troubleshooting .....................................................31
Replacement Parts.................................................33
Burner Assembly ...............................................33
Logs...................................................................35
Warranty....................................................Back page

81D0107 3
IMPORTANT SAFETY INFORMATION
10. This unit complies with the latest revision of ANSI
Z21.11.2-2007 Unvented Heaters and also complies with
ANSI Z21.60 Decorative Vented Appliances for Solid Fuel
Burning Fireplaces. State and local codes may only allow
operation of this appliance in a vented configuration.
Check your state or local codes. For vented operation,
see “Vented Instructions” in this manual.
11. Do not install the heaters in a bathroom or bedroom.
12. Correct installation of the ceramic fiber logs, proper
location of the heater, and annual cleaning are neces-
sary to avoid potential problems with sooting. Sooting,
resulting from improper installation or operation, can
settle on surfaces outside the fireplace. See log placement
instructions for proper installation.
13. 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.
14. Caution: Candles, incense, oil lamps, etc. produce
combustion byproducts including soot. Vent-free appli-
ances 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.
15. This is an unvented gas-fired heater. It uses air (oxygen)
from the room in which it is installed. Provisions for
adequate combustion and ventilation air must be pro-
vided. See page 8.
INSTALLER
Please leave these instructions with the appliance.
OWNER
Please retain these instructions for future reference .
IMPORTANT
Read these instructions carefully before installing or trying to operate this vent-free gas heater.
1. Due to high temperatures, the appliance 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 appliance.
4. Do not place clothing or other flammable 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 qualified
service person.
7. To prevent malfunction and/or sooting, an unvented
gas heater should be cleaned 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 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 flu 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.
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. 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 fire,
burns, explosion or carbon monoxide poisoning.
• Do not allow fans to blow directly into the fireplace. Avoid any drafts that alter burner
flame patterns.
• Do not use a blower insert, heat exchanger insert or other accessory, not approved
for use with this heater where applicable.
WARNING

4 81D0107
IMPORTANT SAFETY INFORMATION
Continued from page 3
16. Keep room area clear and free from combustible materi-
als, gasoline and other flammable vapors and liquids.
17. Unvented gas heaters are a supplemental zone heater.
They are not intended to be the 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, 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 four hours to
properly cure logs and rock wool, with the burner at the
highest setting. Provide maximum ventilation by open-
ing 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 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.
24. This appliance must not be used with glass doors in the
closed position. This can lead to pilot outages and severe
sooting outside the fireplace.
25. Never burn solid fuels in a fireplace where a unvented
room heater is installed.
26. Always have a fireplace screen in place when the appli-
ance is in operation and, unless other provisions for
combustion air are provided, the screen must have an
opening(s) for induction of combustion air.
www.nficertified.org
We suggest that our gas hearth
products be installed and
serviced by professionals who
are certified in the U.S. by the
National Fireplace Institute®
(NFI) as Gas Specialists.
Never connect unit to private (non-
utility)gaswells. Thisgas iscommonly
known as wellhead gas.
WARNING
MASSACHUSSETTS RESIDENTS ONLY:
Please see pages 40 & 41 for
additional information.

81D0107 5
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:
• Unvented Gas Log Burner Assembly • Two (2) Plastic Bags Containing Crushed Volcanic Rock
• Installation/Operating Instructions • Two (2) Anchoring Screws
• Ceramic Fiber Logs / Refractory Logs • Rock wool
• Grate Assembly • On/Off Log Switch Assembly
The following options may be used with the Millivolt controlled heater. These options are not packaged with the log
set.
• Hand Held Remote with Receiver • Wall Thermostat with 15' Wire
• Wall Switch with 15' Wire • Hand held Thermostat Remote with Receiver
• Cast Iron Grate and Andirons • Riser Kit
Gloves are recommended when
handling ceramic fiber logs to prevent
skin irritation from loose fibers. Logs
are fragile — handle with care.
CAUTION
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 parts
in good condition.
WHAT YOU WILL NEED FOR INSTALLATION:
You should have the following items available before proceeding with installation:
• External regulator (for propane/LPG and 1/2 lb. natural gas systems only)
• Piping which complies with local codes • Sediment trap (recommended)
• Screwdriver • Tee joint.
• Pipe sealant approved for use with propane/LPG (Resistant to sulfur compounds)
• Drill with 5/32 masonry bit • Pipe wrench or appropriate size crescent wrench set
• Manual shutoff valve
GETTING STARTED

6 81D0107
PRODUCT FEATURES AND SPECIFICATIONS
NATURAL GAS
NOTE: An external regulator is required to reduce supply pressure to a maximum of 10 1/2" W.C. on
natural gas systems operating at higher pressure.
MILLIVOLT
Regulator Pressure Setting: 3.5" w.c.
Pilot Regulator: 3.5" w.c.
Gas Inlet Pressure: Max 101/2" w.c.
Min. 5" w.c.
PROPANE/LPG
Note: An external regulator is required to reduce supply pressure to a maximum of 13" w.c.
MILLIVOLT
Regulator Pressure Setting: 10" w.c
Gas Inlet Pressure: Max. 13" w.c.
Min. 11" w.c.
IGNITION CONTROLS
Piezo ignitor allows ignition of the pilot without the use of matches or batteries.
Millivolt control has four (4) positions:
OFF - All gas to the gas logs is shut off at the valve.
IGN - Valve position to light/maintain a standing pilot.
ON - Valve position to turn ON/OFF log set with remote switch/thermostat.
LOW/HI - Variable position to control flame height (heat output).
PILOT/ODS
The gas log heater is fitted with a specially designed safety pilot (ODS assembly) which senses the amount of oxygen avail-
able in the room and shuts the gas log heater off if the oxygen level begins to drop below a satisfactory level. The pilot can
only be relit when adequate fresh air is available.
THERMAL GENERATOR
The millivolt gas log pilot is fitted with a Millivolt (thermopile) generator to provide power for remote activation.
Model Number Control Gas Rate Max BTU/Hr Min BTU/Hr
NB18NV Millivolt 28,000 19,000
NB24NV Millivolt 37,000 25,000
Model Number Control Gas Rate Max BTU/Hr Min BTU/Hr
NB18PV Millivolt 27,000 22,000
NB24PV Millivolt 36,000 28,000

81D0107 7
GENERAL INSTALLATION INFORMATION
CODES
Adhere to all local codes or, in their absence, the latest edition of THE NATIONAL FUEL GAS CODE ANSI Z223.1 or
NFPA54 which can be obtained from…
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
or
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
ADEQUATE 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 National Fuel Gas Code, (ANSI Z223.1/NFPA 54), defines a confined space as a space whose volume is less than 50
cubic feet per 1,000 BTU per hour (4.8 m3per kw) of the aggregate input rating of all appliances installed in that space. An
unconfined space is defined as a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour (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) walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of 1 perm
(6 x 1011 kg per pa-sec-m2) or less with openings gasketed or sealed;
b) weather striping has been added on openable 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.

8 81D0107
W
H
The following formula can be used to determine the maximum heater rating per the definition of unconfined space:
BTU/Hr = (L1 + L2) Ft x (W) Ft x (H) Ft. x 1000 BTU/Hr
50
Consider two connecting rooms with an open area between, with the following dimensions:
L1= 151/2Ft., L2= 12 Ft., W = 12 Ft., H = 8 Ft.
BTU/Hr = (151/2+ 12) x (12) x (8) x 1000 = 52800 BTU/Hr
50
If there were a door between the two rooms the calculation would be based only on the room with the heater.
BTU/Hr = (151/2) x (12) x (8) x 1000 = 29760 BTU/Hr
50
GENERAL INSTALLATION INFORMATION
Figure 1 - Example of a Large Room with 1/2 Wall Divider
Counter
Fireplace
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 construction, provide adequate
combustion and ventilation air by one of the methods described in the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Section 5.3 or applicable local codes.
WARNING

81D0107 9
A
C
D
B
FIREPLACE AND HEARTH DIMENSIONS
Use manufacturer's installation and clearance requirements as defined in their manual.
The NB Series unvented room heater is approved for installation into the following unvented fireplaces:
GCUF Series Fireboxes Magnum36/42, Lo-Rider36 or BUF
The NB Series unvented room heater may also be installed into a Ventless Firebox Enclosure for Gas Fired Decorative
Type Unvented Room Heaters per IAS Requirement No. 2-97 ANSI Z21.91-2001 (typically referred to as a "Universal
Firebox"), as long as firebox hearth dimensions meet the minimum hearth dimensions shown below.
Figure 2 - Hearth Minimum Dimension
This appliance is for installation only in a solid-fuel burning masonry or UL127 factory-
built fireplace, vent free appliance, or in listed ventless firebox enclosure. It has been
design certified for these installations.
Exception: DO NOT install this appliance in a factory-built fireplace that includes
instructions stating it has not been tested or should not be used with unvented gas
logs.
WARNING
Model ABCD
NB18 with BO18(R,F) 26" 13" 18" 17"
NB24 with BO24(R,F) 29" 13" 221/4" 17"
NB24 with BO30(R,F) 33" 13" 251/4" 17"
Without front grate installed “B” will be 121/2.

10 81D0107
PLACEMENT IN A FIREPLACE WITH A RESTRICTIVE BARRIER
IMPORTANT INFORMATION FOR THE INSTALLATION OF THIS GAS LOG SET
The following are guidelines for placing a gas log set in a fireplace that has a restrictive barrier along the bottom front open-
ing of the fireplace. Some examples of barriers are glass/screen door frames and sunken/recessed fireplaces.
Glass door frames
with adjustable
louvers should have
the louvers fully
open while the unit is
in operation.
Height of restrictive barrier
caused by glass door frames,
recessed fireplaces, etc. from
the base or bottom surface of the
unit. (See Table).
The log set should be
placed against or as near
as possible to the rear wall
of the fireplace/firebox.
Depth of fireplace/firebox.
(See Table).
Figure 3 - Reference Drawing of a Natural Flame Log Set in an Enclosure
NOTE: Non combustible material such as refractory brick may be used to line the floor of the fireplace
in order to raise the height of the gas log set in relation to a restrictive barrier. If the unit is raised, the
minimum height dimension listed in the homeowner’s manual must not be exceeded.
NOTE: If the log set is equipped with a remote receiver, a restrictive barrier may reduce the battery life by
increasing the ambient temperature inside the fireplace. Placement of the receiver outside of the fireplace
will extend the battery life.
X
Height of Restriction (X) Minimum Depth of Fireplace/Firebox
No restriction 13"
0 to 11/2" 16"
From 11/2" to 3" 16"
Greater than 3" ANY BARRIER GREATER THAN THREE INCHES (3") PLACED IN FRONT OF
THE GAS LOG SET IS NOT RECOMMENDED BY THE MANUFACTURER.
Barriers such as the bottom of a glass door frame placed in front of a gas log set can
change the air flow characteristics of the fireplace which in turn can cause the unit to
overheat and malfunction.
WARNING

81D0107 11
16"
42"
CLEARANCES AND HEIGHT REQUIREMENTS
Sidewall and ceiling clearances: The sides of the fireplace opening must be at least 16" from any combustible wall.
The ceiling must be at least 42" from the top of the fireplace opening.
Figure 4 - Sidewall and Ceiling Clearances
ThedimensionsshowninFigures4through12 anddefinedinthefireplacemanufacturer's
instructions are minimum clearances to maintain when installing this heater. Left and
right clearances are determined when facing the front of the heater.
When heater is installed into a ventless firebox, minimum clearances, as specified by
the ventless firebox manufacturer, must be met.
Follow these instructions carefully to ensure safe installation. Failure to follow
instructions exactly can create a fire hazard.
WARNING

12 81D0107
Measur
e
this
distance
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
Figure 5 - Measuring Heat Resistant Material
Heat resistant material (minimum requirements) with no wooden mantel or other combustible projection:
To install the gas logs into a fireplace with no wooden mantel, shelf or other combustible projection above the fireplace
opening, measure the heat resistant material height, per Figure 5, then see TABLE A.
Heat resistant materials such as slate and marble must be at least 1/2” thick. Sheet metal should not be installed onto
combustible material.
IMPORTANT: If you cannot meet these minimum clearances you must operate the heater with chimney flue damper open.
Refer to “Installing Vented Applications” found on page 18.
TABLE A - Heat Resistant Material Requirements with no Mantel or Combustible Projection
CLEARANCES and HEIGHT REQUIREMENTS
HEAT RESISTANT
MATERIAL
MEASUREMENT
REQUIREMENTS FOR SAFE INSTALLATION
NB18 NB24
12" or more Hood not required. Hood not required.
8" to less than 12" Hood not required. Extend heat resistant material
to 12" OR install hood. See
Figure 5.
Less than 8" Extend heat resistant material
and 8” AND install hood. See
Figure 5.
Extend heat resistant material
to 8" AND install hood. See
Figure 5. OR, extend heat
resistant material to a height of
at least 12".

81D0107 13
Heater in
Fireplace or
Firebox
8" or More of
Heat Resista
n
Material
Hood
CLEARANCES and HEIGHT REQUIREMENTS
Figure 6 - Measuring Heat Resistant Material for Mantel
Heat resistant material (minimum requirements) with wooden mantel or other combustible projection:
To install the heater with a wooden mantel, shelf or other combustible projection above, first measure the heat resistant mate-
rial shown in Figure 6, then refer to Table B.
TABLE B - Heat Resistant Material Heights and Mantel Location
HEAT RESISTANT
MATERIAL
MEASUREMENT
REQUIREMENTS FOR SAFE INSTALLATION WITH WOODEN MANTEL,
SHELF OR OTHER COMBUSTIBLE PROJECTION
NB18 NB24
12" or more Hood not required. Observe profiles (side
elevations) shown in Figure 7, page 14. Hood not required. Observe profile (side elevations) shown in Figure 9, page 15
8" to less than 12" Install hood and observe profiles showin in
Figure 8, page 14, OR extend heat resis-
tant material to at least 12” and observe
profiles shown in Figure 7, page 14.
Install hood and observe profiles shown in
Figure 8, page 14; OR extend heat resistant
material to at least 12" and observe profiles
shown in Figure 9, page 15.
Less than 8" Extend heat resistant material to at least
8", install hood and observe profiles shown
in Figure 8, page 14; OR extend heat resis-
tant material to at least 12" and observe
profiles shown in Figure 7, page 14.
Extend heat resistant material to at least 8",
install hood and observe profiles shown in
Figure 8, page 14, OR extend heat resistant
material to at least 12" and observe profiles
shown in Figure 9, page 15.

14 81D0107
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
Hood
10"
12"
8"
6"
2
1
/ 2 "
8" 14
1
/ 2 "18
5
/ 8 "22
1
/ 2 " 26"
CLEARANCES AND HEIGHT REQUIREMENTS
Figure 8 - Minimum Mantel Clearance with Hood - All Models
Example: A mantel may project from the wall a maximum of 21/2" at a
minimum of 8" above the opening, and a maximum of 6" at a mini-
mum of 141/2" above the opening.
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
10"
8"
6"
2
1
/ 2 "
8" 14" 20
1
/ 2 "24
5
/ 8 " 28"
Example: A mantel may project from the wall a maximum of 21/2" at a mini-
mum of 14" above the opening, and a maximum of 6" at a minimum
of 201/2" above the opening.
Figure 7 - Minimum Mantel Clearance with No Hood -NB18

81D0107 15
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
10" or less
12" min. 28"
21/2"
8"
6"
7"
141/2"
4"
Figure 10 - Minimum Mantel Clearance with Hood - NB24
(Example of Unsafe Installation)
Figure 9 - Minimum Mantel Clearance with No Hood — NB24
Example: The bottom of the mantel may project from the wall a maxi-
mum of 10" at a minimum of 28" above the opening.
CLEARANCES AND HEIGHT REQUIREMENTS
Figure 10 is an example of an unsafe mantel installation.
This mantel projects 4" at 8" above the opening, exceeding the
maximum acceptable distance of 21/2" The mantel also proj-
ects 7" at 141/2" above the opening, exceeding the maximum
acceptable distance of 6".
If your mantel profile is unsafe, you may either:
• Raise the mantel to an acceptable height
OR
• Remove the mantel

16 81D0107
Heater in
Fireplace or
Firebox
13/8" Minimum
Combustible
Material
14" Minimum
Heater in
Fireplace or
Firebox
Combustible
Material
This Distance
May Now Be
Less than 1
3
/ 8 "
FLOOR CLEARANCE
The gas log heater must be installed at least 13/8" above any combustible flooring material, such as carpeting or tile, which
is closer than 14" to the base of the fireplace. The minimum distance must be maintained from the top surface of carpeting,
tile, etc. See Figure 11.
OR
The gas log heater may be installed nearer to the floor if a minimum of 14" of noncombustible material such as slate or marble
is installed between the base of the fireplace and the combustible flooring. See Figure 12.
Figure 11 - Minimum Clearance above Combustible Flooring
Figure 12 - Minimum Clearance above Combustible Flooring with
Noncombustible Material Installed at Base of Fireplace

81D0107 17
Damper Stop
Damper
Figure 13 - Damper Stop Installation.
FIREPLACE PREPARATION
BEFORE FULLY INSTALLING THE UNIT:
• Turn OFF the gas supply to the fireplace or firebox.
• Seal any fresh air vents and/or ash clean-out doors located on the floor or wall of the fireplace. If left unsealed, drafting
may cause pilot outage or sooting. Use a heat resistant sealant. Do not seal the chimney flue damper.
INSTALLING VENTED APPLICATIONS
Manual and Millivolt controlled gas logs may be installed as a vented decorative log set in compliance with ANSI Z21.60
and National Fuel Gas Code, Section 6.6. Since, the gas logs are operated with the damper open, non-combustible mate-
rial and minimum mantel requirements do not apply.
BEFORE INSTALLING THE APPLIANCE:
• Turn off gas supply to fireplace or firebox.
• Have the fireplace floor and chimney professionally cleaned to remove ashes, soot, creosote or other obstructions. Have
this cleaning performed annually after installation.
• Seal any fresh air vents or ash clean-out doors located on floor or wall of fireplace. If not, drafting may cause pilot
outage or sooting. Use a heat-resistant sealant.
Install and operate the appliance as directed in this
manual.
DAMPER STOP INSTALLATION:
A damper stop must be provided with the unit. Contact
your dealer to obtain one. The damper stop must be
installed as shown in Figure 13 to prevent full closure
of the fireplace damper blade and provide a minimum
29 square inch flue opening.
WARNING
This appliance is for installation only in a solid fuel burning fireplace (masonry fireplace
or manufactured fireplace) with a working flue and constructed of noncombustible
material.
Exception: DO NOT install this appliance in a factory-built fireplace that includes
instructions stating that it has not been tested or should not be used with unvented
gas logs. This log set may be installed as a vented log set.
WARNING
Before installing in a solid fuel burning
fireplace, The chimney flue and firebox must
be cleaned of soot, creosote, ashes and loose
paint by a qualified chimney cleaner.
WARNING
The fireplace and gas logs function as a system. If the fireplace is spilling into the room
(check with a match or a smoke stick), reposition the damper clamp until a positive
draft is obtained by opening the damper. If negative pressure in home prevents having
a positive draft, contact your dealer for assistance.

18 81D0107
INSTALLING VENTED APPLICATIONS
PLACING AND SECURING APPLIANCE
ASSEMBLY PROCEDURE:
1. Center the gas log unit on the fireplace or firebox. Make certain the front of the burner sits inside the front edge of the
fireplace or firebox.
2. Anchor holes are located on the right and left sides of the unit. After centering the burner correctly, mark the hole posi-
tions on the fireplace/firebox floor. Drill two (2) 5/32" diameter holes approximately 11/2" deep.
3. Anchor the burner to the fireplace/firebox floor using the screws provided. See Figure 14.
Proper installation of the grate is essential to prevent any movement of the gas logs and controls during operation.
Figure 14 - Securing Heater to Floor of Fireplace/Firebox
Screw
Anchor Hole
Screw
WARNING
You must secure the gas log heater to the fireplace floor. If not, the entire unit may move
when you adjust the controls. Movement of unit may cause shifting of the gas logs which
leads to sooting and improper burning. Grate movement could cause a gas leak.
Special care is required if you are installing the unit into a sunken fireplace.You must raise
the fireplace floor to allow access to gas log controls. This will insure adequate air flow
and guard against sooting. Raise the fireplace floor using noncombustible materials, as
described in Placement in a Fireplace with Restrictive Barrier on page 10.

81D0107 19
Pipe Coupling
To Heater
Valve
Gas Supply
Inlet
CONNECTING THE GAS
NOTICE: A qualified gas appliance installer must connect the heater to the gas supply. Consult all local
codes.
IMPORTANT: Hold heater valve firmly with a wrench to prevent movement when connecting to inlet pipe.
Manual Shutoff
Valve
Pipe
Stainless
Flexible Tube
Figure 15 - Gas Connection
Always use an external regulator for all propane/LPG heaters and high pressure one to two-pound systems only, to
reduce the supply tank pressure to a maximum of 13" w.c. This is in addition to the internal regulator in the heater valve.
Locations that the Pressure
Tapping Point May Be Installed
CAUTION
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.
CAUTION
Use new black iron or steel pipe. Internally tinned copper or copper tubing can be used
per National Fuel Code, section 2.6.3, providing gas meets hydrogen sulfide limits, and
where permitted by local codes. Gas piping system must be sized to provide minimum
inlet pressure (Listed on Data Plate) at the maximum flow rate (BTU/Hr). Undue pressure
loss will occur if the pipe is too small.
A manual shutoff valve must be installed upstream of the appliance. Union tee and
plugged 1/8" NPT pressure tapping point should be installed upstream of the appliance.
See Figure 15

20 81D0107
CHECKING GAS PRESSURE
The heater gas inlet connection is a 3/8" NPT at the valve. On all
control type units, the inlet connection is on the right side of unit.
To connect from the opposite side, route the pipe around the back
portion of the unit.
When tightening up the joint to the valve, hold the valve securely
to prevent movement.
MILLIVOLT VALVE CONTROL (Figure 16)
The valve regulator controls the burner pressure which
should be checked at the pressure test point.
Turn captured screw counter clockwise two or three
turns and then place tubing to pressure gauge over test
point (Use test point “OUT” closest to control knob).
After taking pressure reading, be sure and turn captured
screw clockwise firmly to re-seal. Do not over torque.
Check for gas leaks.
Test all gas joints from the gas meter to the heater valve for leaks using a gas analyzer or soap and water solution after com-
pleting connection. DO NOT USE AN OPEN FLAME.
Check the gas pressure with the appliance burning and the control set to HIGH.
WARNING
Connecting directly to an
unregulated propane/LPG tank
can cause an explosion.
Figure 16 - Pressure Test Point Location
Millivolt Control
Test Port “OUT”