Monessen Hearth DLX18 User manual

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.
READ AND SAVETHESE INSTRUCTIONS
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.
–WHATTO DO IFYOU 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 fire
department.
–Installation and service must be performed by a
qualified installer,service agency or the gas supplier.
MODELS
DLX18/GLX18
DLX24/GLX24
DLX28/GLX28
Natural Gas or Propane/LPG
ControlType:
Manual,Thermostat or Milli-Volt
UNVENTED GAS LOG HEATER OR
VENTED DECORATIVE APPLIANCE
INSTALLATION AND OPERATING INSTRUCTIONS

2 14D2099
CONTENTS
CONTENTS ........................................................................................................................................................... 2
IMPORTANT SAFETY INFORMATION............................................................................................................. 3
GETTING STARTED ............................................................................................................................................ 5
PRODUCT FEATURES AND SPECIFICATIONS ............................................................................................... 6
GENERAL INSTALLATION INFORMATION.................................................................................................... 7
FIREPLACEAND HEARTH DIMENSIONS ....................................................................................................... 9
PLACEMENT INA 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
ELECTRICAL WIRING (MILLI-VOLT)............................................................................................................ 21
LOG PLACEMENT ............................................................................................................................................. 23
FLAME APPEARANCE...................................................................................................................................... 24
CHECKING THE BURNER FLAME ................................................................................................................. 25
OPERATING INSTRUCTIONS .......................................................................................................................... 26
FORYOUR SAFETY READ BEFORE LIGHTING .................................................................................... 26
MANUAL CONTROL LIGHTING INSTRUCTIONS ................................................................................. 27
THERMOSTATIC CONTROL LIGHTING INSTRUCTIONS..................................................................... 28
MILLI-VOLT CONTROL LIGHTING INSTRUCTIONS ............................................................................ 29
MATCH LIGHTING INSTRUCTIONS ........................................................................................................ 30
CLEANING AND SERVICING .......................................................................................................................... 31
REPLACEMENT PARTS LIST ........................................................................................................................... 32
TROUBLESHOOTING........................................................................................................................................ 36

14D2099 3
10. This unit complies withANSI Z21.11.2b-1998 Unvented
HeatersandalsocomplieswithANSIZ21.60-1996Deco-
rative Vented Appliances for Solid Fuel Burning Fire-
places. 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 lo-
cation of the heater, and annual cleaning are necessary
to avoid potential problems with sooting. Sooting, re-
sultingfromimproperinstallationoroperation,cansettle
on surfaces outside the fireplace. See log placement in-
structions 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 cre-
ate drafts that alter burner flame patterns. Sooting and
improper burning will occur.
14. Caution:Candles,incense,oillamps,etc. produce com-
bustion byproducts including soot.Vent-free appliances
will not filter or clean soot produced by these types of
products. In addition, the smoke and/or aromatics
(scents) may be reburnt in the vent-free appliance which
can produce odors. It is recommended to minimize the
use of candles, incense, etc. while the vent-free appli-
ance 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. Refer to 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 this vent-free gas heater.
WARNING
•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 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.
IMPORTANT SAFETY INFORMATION
1. Due to high temperatures, the heater should be lo-
cated 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 heater
4. Do not place clothing or other flammable material
near the fireplace when the heater is in use.
5. Any safety screen or guard removed for servicing,
must be replaced prior to operating the heater.
6. Installation and repair should be done by a quali-
fied service person.
7. To prevent malfunction and/or sooting,anunvented
gas heater should be cleaned at least annually by a
professional service person. More frequent clean-
ing may be required due to excessive lint from car-
peting, etc. It is imperative that control compart-
ments, 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 ser-
viced 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. Continued on page 4

4 14D2099
IMPORTANT SAFETY INFORMATION
This appliance may be installed in an aftermar-
ket,permanentlylocated,manufactured(mobile)
home, where not prohibited by local codes.
This appliance is only for use with the type of gas
indicatedontheratingplate.This appliance is not
convertible for use with other gases.
Continued from page 3
16. Keep room area clear and free from combustible mate-
rials, gasoline and other flammable vapors and liquids.
17. Unvented gas heaters are a supplemental zone heater.
They are not intended to be a primary heating appli-
ance. Water vapor produced by an unvented heater can
create moisture problems in a home when operated for
extended periods of time.
18. During manufacturing, fabricating and shipping, vari-
ous components of this appliance are treated with cer-
tain oils, films or bonding agents. These chemicals are
notharmfulbutmayproduceannoying smokeandsmells
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
hourswiththe burneratthe highest setting. Providemaxi-
mum 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.
19. 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.
20. The heater and its individual shutoff valve must be dis-
connected from the gas supply piping system during any
pressure testing of that system at test pressures in ex-
cess of 1/2 psig (3.5 kPa).
21. The heater must be isolated from the gas supply piping
system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping sys-
tem at test pressures equal to or less than 1/2 psig (3.5
kPa).
22. 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 un-
der water.
23. This appliance must not be used with glass doors in the
closed position. This can lead to pilot outages and se-
vere sooting outside the fireplace.
24. Never burn solid fuels in a fireplace where a unvented
room heater is installed.
25. 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 shall have an
opening(s) for induction of combustion air.

14D2099 5
CAUTION
Handle the gas log burner assembly by the grate only. Do
not pick the unit up by the burners.
Gloves are recommended when handling ceramic fiber logs
to prevent skin irritation from loose fibers. Logs are fragile
—handle with care.
MAKE SUREYOU 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 grate/burner assembly.
•Installation/operating instructions.
•Ceramic fiber logs.
•Two (2) anchoring screws.
•Plastic bag containing crushed volcanic rock.
The millivolt controlled version of this heater is the only style designed to be operated with optional devices for ON/OFF
functions. The following options may be used with the millivolt controlled heater. These options are not packaged with the
log set.
•Hand held Remote w/receiver.
•Wall Switch with 20' wire.
•Wall T-stat with 20' wire.
•Hand held Thermostat Remote w/receiver.
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 must have the following items available before proceeding with installation:
•External regulator (for propane/L.P.G. only)
•Piping which complies with local codes
•Pipe sealant approved for use with propane/L.P.G. (Resistant to sulfur compounds)
•Manual shutoff valve
•Sediment trap
•Tee joint
•Pipe wrench or appropriate size crescent wrench set
•Screwdriver
•Drill, with 5/32 bit
GETTING STARTED

6 14D2099
PROPANE / LPG
Note: An external regulator is required to reduce supply pressure to a maximum of 13" w. c.
MANUAL /T-STAT PRESSURE MILLIVOLT PRESSURE
Regulator Pressure Setting: 10" w.c. Regulator Pressure Setting: 10" w.c.
Gas Inlet Pressure: Maximum 13" w.c. Gas Inlet Pressure: Maximum 13" w.c.
Minimum 11" w.c. Minimum 11" w.c.
NATURAL GAS
MANUAL /T-STAT PRESSURE MILLIVOLT PRESSURE
Regulator Pressure Setting: 3" w.c. Regulator Pressure Setting: 3.5" w.c.
Pilot Regulator: 3.5" w.c.
Gas Inlet Pressure: Maximum 10 1/2" w. c. Gas Inlet Pressure: Max. 10 1/2" w. c.
Minimum 5" w.c. Min. 5" w.c.
IGNITION CONTROLS
Piezo ignitor allows ignition of the pilot without the use of matches or batteries.
Manual 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.
LOW -Minimum gas rate — front burner provides a realistic glow on the center log.
HI -Maximum gas rate — front burner provides a realistic glow on the center log, plus the rear burner
provides a pleasing yellow flame.
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
DLX18NV, GLX18NV Manual 26,000 16,000
DLX24/28NM, GLX24/28NM Manual 32,000 19,000
DLX18NT, GLX18NT T-Stat 26,000 16,000
DLX24/28NT Milli-Volt 26,000 20,000
DLX18NV, GLX18NV Milli-Volt 26,000 17,000
DLX24/28NV, GLX24/28NV Milli-Volt 32,000 22,000
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
DLX18PV, GLX18PV Manual 22,000 14,000
DLX24/28PM, GLX24/28PM Manual 33,000 19,000
DLX18PT, GLX18PT T-Stat 26,000 16,000
DLX24/28PT Milli-Volt 28,000 20,000
DLX18PV, GLX18PV Milli-Volt 22,000 17,000
DLX24/28PV, GLX24/28PV Milli-Volt 33,000 22,000
PRODUCT FEATURES AND SPECIFICATIONS

14D2099 7
Thermostat control has three (3) positions:
OFF -All gas to the gas logs is shut off at the valve.
IGN -Valve position to light/maintain a standing pilot.
LOW/HI -Variable position corresponding to desired temperature. Both front and rear burners are in operation to
provide realistic glow and yellow flame.
Milli-Volt 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 or with ON/OFF switch on the set.
LOW/HI -Variable position to control flame height (heat output). Both front and rear burners are in operation to
provide realistic glow and yellow flame.
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
NewYork, NY 10018
or
National Fire ProtectionAssociation, Inc.
Batterymarch Park
Quincy, MA 02269
ADEQUATE COMBUSTION ANDVENTILATION 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), 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.
UNUSUALLYTIGHT CONSTRUCTION IS DEFINED AS CONSTRUCTIONWHERE…
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, and
b) weather striping has been added on openable windows and doors, and
c) caulking or sealant are applied to areas such as joints around windows and door frames; between sole plates and doors;
between wall-ceiling joints; between wall panels; at penetrations for plumbing, electrical, and gas lines; and at other
openings.

8 14D2099
W
H
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 construction, provide
adequate combustion and ventilation air by one of the methods described in the
National Fuel Gas Code, ANSI Z223.1, Section 5.3 or applicable local codes.
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
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
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
50
GENERAL INSTALLATION INFORMATION
Figure 1 - Example of a Large Room with 1/2Wall Divider
Counter
Fireplace
x 1000
x 1000 = 52800 BTU/HR
x 1000 = 29760 BTU/HR

14D2099 9
A
C
D
B
WARNING
WARNING
Model A B C D
DLX18/GLX18 171/2"13
1/4" 27" 17"
DLX24/GLX24 171/2" 14" 29" 17"
DLX28/GLX28 21" 14" 33" 17"
FIREPLACE AND HEARTH DIMENSIONS
Use manufacturer's installation and clearance requirements as defined in their manual.
The LX Series unvented room heater may also be installed into aVentless Firebox Enclosure for Gas Fired Decorative Type
Unvented Room Heaters per IAS Requirement No. 2-97 (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 forVentless Universal Fireboxes, Solid Fuel Burning
Fireplaces and UL127 Factory Built Fireplaces
Thisappliance is forinstallation onlyin asolid-fuelburningmasonry or UL127factory-
built fireplace or in a 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 that it has not been tested or should not
be used with unvented gas logs.

10 14D2099
WARNING
Height of Restriction (X) Minimum Depth of Fireplace/Firebox
No restriction 131/4"
0 to 1.5" 16"
Greater than 11/2" to 3" 16"
Greater than 3: ANY BARRIER GREATER THAN THREE INCHES (3")
PLACED IN FRONT OFTHE GAS LOG SET IS NOT
RECOMMENDED BYTHE MANUFACTURER.
PLACEMENT IN A FIREPLACEWITH A RESTRICTIVE BARRIER
IMPORTANT INFORMATION FORTHE INSTALLATION OFTHIS 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
opening of the fireplace. Some examples of barriers are glass/screen door frames and sunken/recessed fireplaces.
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.
Glass door frames
with adjustable
louvers should have
the lovers 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.
(Refer to 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.
(Refer toTable).
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

14D2099 11
16"
42"
WARNING
The dimensions shown in Figures 3 through 11 and defined in the fireplace
manufacturer'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.
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 & Ceiling Clearances

12 14D2099
Measure
this
distance
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
CLEARANCES and HEIGHT REQUIREMENTS
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 4, then refer to 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 17.
Figure 5 - Measuring Heat Resistant Material
HEAT RESISTANT REQUIREMENTS FOR SAFE INSTALLATION
MATERIAL
MEASUREMENT DLX18/GLX18 DLX/GLX 24 AND 28
All Models All Models
12" or more Hood not required. Hood not required.
8" to less than 12" Hood not required. Extend heat resistent material to 12"
or install hood. See Figure 5.
Less than 8" Extend heat resistant Extend heat resistant material to at
material to at least 8" least 8" and install hood. See Figure
5. OR, extend heat resistant material
to a height of at least 12".
TABLE A - Heat Resistant Material Requirements with no Mantel or Combustible Projection

14D2099 13
Heater in
Fireplace or
Firebox
8" or More of
Heat Resistant
Material
Hood
HEAT RESISTANT REQUIREMENTS FOR SAFE INSTALLATION WITHWOODEN MANTEL,
MATERIAL SHELF OR OTHER COMBUSTIBLE PROJECTION
MEASUREMENT DLX/GLX 18 DLX/GLX 24 AND 28
12" or more Hood not required. Observe profiles (side Hood not required. Observe profile (side
elevations) shown in Figure 7, page14. elevations) shown in Figure 9, page 15.
8" to less than 12" Install hood and observe profiles shown Install hood and observe profiles shown
in Figure 8, page 14; OR extend heat in Figure 7, page 14; OR extend heat
resistant material to at least 12" and observe resistant material to at least 12" and observe
profiles shown in Figure 7, page 14. profiles shown in Figure 9, page 15.
Less than 8" Extend heat resistant material to at least Extend heat resistant material to at least
8", install hood and observe profiles shown 8", install hood and observe profiles shown
in Figure 8, page 14; OR extend heat in Figure 7, page 14; OR extend heat
resistant material to at least 12" and observe resistant material to at least 12" and observe
profiles shown in Figure 8, page 14. profiles shown in Figure 8, page 14.
CLEARANCES AND HEIGHT REQUIRMENTS
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
material shown in Figure 6.
Figure 6 - Measuring Heat Resistant Material for Mantel
TABLE B - Heat Resistant Material Heights and Mantel Location

14 14D2099
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
10"
8"
6"
21/2"
41/8"
61/2"
8" 14" 201/2" 245/8" 28"
37/8
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
Hood
10"
12"
8"
6"
21/2"
8" 141/2" 185/8" 221/2" 26"
Example: A mantel may project from the wall a maximum of 21/2" at a mini-
mum of 8" above the opening, and a maximum of 6" at a minimum
of 141/2" above the opening.
CLEARANCES AND HEIGHT REQUIRMENTS
Figure 7 - Minimum Mantel Clearance with No Hood — DLX/GLX 18
Figure 8 - Minimum Mantel Clearance with Hood — All Models
Example:
The bottom of the mantel may project from the wall a maximum of
21/2" at a minimum of 14" above the opening. The top shelf of the
mantel may project a maximumof 6" at a minimumof 201/2"above
the opening.

14D2099 15
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
10" and Less
12" 28"
Minimum of 8"
Heat
Resistant
Material
Mantel
Hood
21/2"
8"
6"
7"
141/2"
4"
Figure 10 is an example of an unsafe mantel installa-
tion. This mantel projects 4" at 8" above the opening,
exceeding the maximum acceptable distance of 21/2"
The mantel also projects 7" at 141/2" above the open-
ing, 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
CLEARANCES AND HEIGHT REQUIREMENTS
Figure 9 - Minimum Mantel Clearance with No Hood — DLX/GLX 24 and 28
Figure 10 - Unacceptable Mantel Clearance
Example: The bottom of the mantel may project from the wall a
maximum of 10" at a minimum of 28" above the opening.

16 14D2099
Heater in
Fireplace or
Firebox
5" Minimum
Combustible
Material
14" Minimum
Heater in
Fireplace or
Firebox
Combustible
Material
This Distance
May Now Be
Less than 5"
FLOOR CLEARANCE
The gas log heater must be installed at least 5" above any combustible flooring material, such as carpeting or tile, which is
closer than 14" to the base of the fireplace. Refer to 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. Refer to Figure 12.
Figure 11 - Minimum Clearance above Combustible Flooring
Figure 12 - Minimum Clearance above Combustible Flooring with
Noncombustible Material Installed at Base of Fireplace

14D2099 17
WARNING
Damper Stop
Damper
WARNING
Figure 13 - Damper Stop Installation.
(See WARNING at top of next page.)
FIREPLACE PREPARATION
BEFORE FULLY INSTALLINGTHE 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.
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.
INSTALLINGVENTED APPLICATIONS
Manual and millivolt controlled gas logs may be installed as a vented decorative log set in compliance withANSI Z21.60 and
National Fuel Gas Code, Section 6.6 Since, the gas logs are operated with the damper open, non-combustible material and
minimum mantel requirements do not apply.
BEFORE INSTALLINGTHE 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. Do not seal chimney flue damper.
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.
This appliance is for installation only in a solid fuel burning
fireplace(masonry fireplaceor manufacturedfireplace) with
a working flue and constructed of noncombustible material.
Exception:DO NOT install this applicance in a factory-built
fireplace that includes instructions stating it has not been
tested or should not be used with unvented gas logs.

18 14D2099
Anchor 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 A
RESTRICTIVE BARRIER”on page 10.
INSTALLINGVENTED APPLICATIONS
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.
PLACING AND SECURING APPLIANCE
ASSEMBLY PROCEDURE:
1. Center the gas log unit in the fireplace or firebox. Make certain the front feet of the grate sit inside the front edge of the
fireplace or firebox.
2. Refer to Figure 14 for hole locations.After centering the grate correctly, mark the hole positions on the fireplace/firebox
floor. Drill two (2) 5/32" diameter holes approximately 11/2" deep.
3. Anchor the grate to the fireplace/firebox floor using the screws provided. Refer to 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

14D2099 19
Pipe Coupling
To Heater
Valve
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. Refer to Figure 15.
CONNECTINGTHE 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 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.
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 INSTALLTHE HEATER. Contact
your dealer for the correct model.
Gas Supply Inlet
Locations that the
Pressure Tapping
Point May Be
Installed

20 14D2099
CHECKING GAS PRESSURE
WARNING
Connecting directly to an
unregulated propane/LPG
tank can cause an explosion.
NPT Test Plug
Test Port “OUT”
Test
Points
Test all gas joints from the gas meter to the heater valve for leaks using a gas analyzer or soap and water solution after
completing connection. DO NOT USE AN OPEN FLAME.
Check the gas pressure with the appliance burning and the control set to HIGH.
MANUAL CONTROL (Figure 16)
The pressure regulator is preset and locked to discour-
age tampering. If the pressure is not as specified, re-
place the regulator with the correct part from the parts
list in this manual.
Remove 1/8" NPT plug, located on either side of regu-
lator body. Install fitting and tubing to pressure gauge.
Aftertaking pressure reading, reinstall test plug. Check
for gas leaks.
THERMOSTAT CONTROL (Figure 17)
Turn captured screw counter clockwise two or three
turns and then place tubing to pressure gauge over test
point (Use test point closest to control knob).After tak-
ing pressure reading, be sure and turn captured screw
clockwise firmly to reseal. Do not over torque. Check
for gas leaks.
MILLIVOLT CONTROL (Figure 18)
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 gas inlet). Af-
ter taking pressure reading, be sure and turn captured
screw clockwise firmly to reseal. Do not over torque.
Check for gas leaks.
Figure 16 - PressureTest Point Location
Figure 17 - AlternateTest Point Location forThermostat
Control Unit
Figure 18 - PressureTest Point Location
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 the
unit. To connect from the opposite side, route the pipe under the
rear portion of the unit.
When tightening up the joint to the valve, hold the valve securely to
prevent movement.