Monessen Hearth DLX18, DLX28, GLX24, GLX18, GLX28 User Manual
UNVENTED GAS LOG HEATER OR
VENTED DECORATIVE APPLIANCE
INSTALLATION AND OPERATING INSTRUCTIONS
MODELS
DLX18/GLX18
DLX24/GLX24
DLX28/GLX28
Natural Gas or Propane/LPG
Control T ype:
Manual, Thermostat or Milli-Volt
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 f ollowed e xactly,
a fire or explosion may result causing pr operty 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 an y other
appliance.
– WHAT TO DO IF YOU SMELL GAS
•Do not try to light any appliance.
•Do not touch any electrical switc h; do not use an y
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 .
READ AND SAVE THESE INSTRUCTIONS
CONTENTS
CONTENTS ........................................................................................................................................................... 2
IMPORTANT SAFETY INFORMATION............................................................................................................. 3
GETTING STARTED ............................................................................................................................................ 5
PRODUCT FEATURES AND SPECIFICATIONS ............................................................................................... 6
GENERAL INSTALLATION INFORMATION.................................................................................................... 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
INST ALLING 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
FOR YOUR 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
2
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IMPORTANT SAFETY INFORMATION
INSTALLER
Please leave these instructions with the owner.
Read these instructions carefully before installing or trying to operate this vent-free gas heater.
•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.
WARNING
• Do not use a blower insert, heat e xchanger insert or other accessory, not appro ved
for use with this heater where applicable.
1. Due to high temperatures, the heater should be located out of traffic and away from furnitur e 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.
OWNER
Please retain these instructions for future reference
IMPORTANT
10. This unit complies with ANSI Z21.11.2b-1998 Unvented
.
Heaters and also complies with ANSI Z21.60-1996 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.
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 qualified service person.
7. To prevent malfunction and/or sooting, an unvented
gas heater should be cleaned at least annually by a
professional service person. More frequent cleaning may be required due to excessive lint from car peting, 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 hea ter 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.
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 necessary
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. A void any drafts that alter b urner flame patterns. Do not
allow fans to blow directly into f ireplace. Do not place a
blower inside burn area of f irebox. 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 appliances
will not filter or clean soot produced by these types of
products. In addition, the smoke and/or aromatics
(scents) may be reburnt in the vent-free appliance which
can produce odors. It is recommended to minimize the
use of candles, incense, etc. while the vent-free appliance is in operation.
15. This is an unvented g as-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 installation guidelines.
Continued on page 4
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3
IMPORTANT SAFETY INFORMATION
Continued from page 3
16. Keep room area clear and free from combustible materials, 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 appliance. 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, 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 of f during the initial operation of the
appliance; possibly causing headaches or eye or lung
irritation. This is a normal and temporary occurrence.
The initial break-in operation should last two to three
hours with the burner at the highest setting. Provide maximum ventilation by opening windows or doors to allo w
odors to dissipate. Any odors remaining after this initial
break-in period will be slight and will disappear with
continued use.
24. Never burn solid fuels in a fireplace where a unvented
room heater is installed.
25. Always have a f ireplace screen in place when the appliance is in operation and , unless other provisions for
combustion air are provided, the screen shall have an
opening(s) for induction of combustion air.
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.
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 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).
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 system 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 qualif ied 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.
23. 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.
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GETTING STARTED
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 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
log set.
•Hand held Remote w/receiver.
•Wall Switch with 20' wire.
•Wall T-stat with 20' wire.
•Hand held Thermostat Remote w/receiver.
Handle the gas log burner assembly by the grate only. Do
not pick the unit up by the burners.
not packaged with the
Gloves are recommended when handling ceramic fiber logs
to prevent skin irritation from loose fibers. Logs are fragile
CAUTION
— handle with care.
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
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5
PRODUCT FEATURES AND SPECIFICA TIONS
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.
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
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.
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
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.
6
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GENERAL INSTALLATION INFORMATION
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 -Varia ble 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 -Varia ble position to control flame height (heat output). Both front and rear burners are in operation to
provide realistic glow and yellow flame.
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), defines a confined space as a space whose v olume is less than 50 cubic feet
per 1,000 BTU per hour (4.8 m
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 10
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.
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11
kg per-pa-sec-m2) or less with openings gasketed or sealed, and
3
per kw) of the aggregate input rating of all appliances installed in that space. An unconf ined
7
GENERAL INSTALLATION INFORMATION
Figure 1 - Example of a Large Room with 1/2 Wall Divider
Counter
Fireplace
H
W
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
50
Consider two connecting rooms with an open area between, with the following dimensions:
1
1 = 15
L
/2 Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.
BTU/HR = (151/2 + 12) x (12) x (8) x 1000
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
x 1000 = 29760 BTU/HR
50
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.
WARNING
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FIREPLACE AND HEARTH DIMENSIONS
This appliance is for installation only in a solid-fuel b urning masonry or UL127 factorybuilt 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.
WARNING
Use manufacturer's installation and clearance requirements as defined in their manual.
The LX 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 (typically referred to as a "Universal Firebox"), as long as firebox
hearth dimensions meet the minimum hearth dimensions shown below.
WARNING
A
D
C
B
Model A B C D
DLX18/GLX18 17
DLX24/GLX24
DLX28/GLX28 21" 14" 33" 17"
Figure 2 - Hearth Minimum Dimension for Ventless Universal Fireboxes, Solid Fuel Burning
Fireplaces and UL127 Factory Built Fireplaces
1/
"131/4" 27" 17"
2
1/
17
" 14" 29" 17"
2
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9
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
opening of the fireplace. Some examples of barriers are glass/screen door frames and sunken/recessed fireplaces.
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 OF THE GAS LOG SET IS NOT
RECOMMENDED BY THE MANUFACTURER.
Glass door frames
with adjustable
louvers should have
the lovers fully open
while the unit is in
operation.
The log set should be
placed against or as near
as possible to the rear wall
of the fireplace/firebox.
Height of restrictive barrier
caused by glass door frames,
recessed fireplaces, etc. from the
base or bottom surface of the
(Refer to Table).
unit.
X
Depth of fireplace/firebox.
(Refer toTable).
Figure 3 - Reference Drawing of a Natural Flame Log Set in an Enclosure
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
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.
10
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CLEARANCES AND HEIGHT REQUIREMENTS
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.
WARNING
Follow these instructions carefully to ensure safe installation. Failure to follow
instructions exactly can create a fire hazard.
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.
42"
16"
Figure 4 - Sidewall & Ceiling Clearances
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11
CLEARANCES and HEIGHT REQUIREMENTS
Heat resistant material (minimum requirements) with no wooden mantel or other comb ustible 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.
Heat
Resistant
Material
Heater in
Fireplace or
Firebox
Measure
this
distance
12
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.
Less than 8" Extend heat resistant Extend heat resistant material to at
material to at least 8" least 8" and install hood.
5.
OR, extend heat resistant material
to a height of at least 12".
See Figure 5.
See Figure
TABLE A - Heat Resistant Material Requirements with no Mantel or Combustible Projection
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