Monessen Hearth HVFL18 User Manual
UNVENTED GAS LOG HEATER OR
VENTED DECORATIVE APPLIANCE
INSTALLATION AND OPERATING INSTRUCTIONS
MODELS: HVFL18 and HVFL24
Natural Gas or Propane/LPG
Control Type: Manual and Milli-Volt
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.
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 8.
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.
• Imm e dia t ely call yo ur gas sup p lie r 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
Important Safety Information ..................................3
Getting Started ..........................................................5
Product Features and Specifications ....................6
Natural Gas .........................................................6
Propane/LP .......................................................... 6
Ignition Controls ................................................... 7
Pilot ...................................................................... 7
Thermal Generator .............................................. 7
General Installation Information ............................7
Codes .................................................................. 7
Adequate Combustion and Ventilation Air ...........
Fireplace and Hearth Dimensions .......................10
Placement in a Fireplace with a Restrictive Barrier
........................................................................... 11
Clearances and Height Requirements ................. 12
Floor Clearance .....................................................17
Fireplace Preparation ............................................ 18
Installing Vented Applications .............................19
Connecting the Gas ...............................................20
Checking Gas Pressure ........................................21
Manual Control .................................................. 21
Milli-Volt/Thermostat Control .............................
7
21
Electrical Wiring (Milli-volt) ...................................
Connecting Remote Receiver ............................ 23
Installing Thermostat Sensor .............................
Operation of Thermostat Sensor ....................... 25
Rock Wool and Log Placement ............................ 26
Kentucky Stack ..................................................26
Split Maple .........................................................28
Flame Appearance ..................................................30
Milli-Volt/Thermostat Control ............................. 30
Manual Control .................................................. 30
Checking Burner Flames ......................................31
Operating Instructions ........................................... 32
For Your Safety Read Before Lighting ...............32
Manual Control Lighting Instructions ................
Milli-Volt/Thermostat Control
Lighting Instructions ........................................... 34
Match Lighting Instructions ................................
Cleaning Instructions ............................................. 35
Troubleshooting .....................................................36
Replacement Parts .................................................38
Burner Assembly ...............................................
Logs ...................................................................40
Warranty .................................................... Back page
22
23
33
35
38
2 59D1015
IMPORTANT SAFETY INFORMATION
INSTALLER
Please leave these instructions with the appliance.
IMPORTANT
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 any drafts that alter
burner flame patterns.
WARNING
• Do not use a blower insert, heat exchanger insert or other accessory, not approved
for use with this heater where applicable.
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 frequent 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.
OWNER
Please retain these instructions for future reference
10. This unit complies with ANSI Z21.11.2-2001 Unvented
Heaters and also complies with ANSI Z21.60-2000 Deco
rative 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 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. 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
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 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. See page 8.
Continued on page 4
.
-
59D1015 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 the primary heating appliance.
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.
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 two to three
hours with the burner at the highest setting. Provide
maximum ventilation by opening windows or doors to
allow odors to dissipate. Any odors remaining after this
initial break-in period will be slight and will disappear
with continued use.
20. Input ratings are shown in BTU per hour and are for
elevations up to 2,000 feet. For elevations above 2,000
feet, input ratings should be reduced 4 percent for
each 1,000 feet above sea level. Refer to the National
Fuel Gas Code.
26. Always have a fireplace screen in place when the appliance is in operation and, unless other provisions for
combustion air are provided, the screen must have an
opening(s) for induction of combustion air.
Never connect unit to private
(non-utility) gas wells. This
gas is commonly known as
wellhead gas.
WARNING
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.
www.nficertified.org
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.
4 59D1015
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 • Two (2) plastic bags containing crushed volcanic rock
• Installation/operating instructions • Four (4) anchoring screws
• Ceramic fiber logs / Refractory logs • Rock wool
The milli-volt 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 milli-volt 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
• Thermostat sensor
• Handle the gas log burner assembly by the burner 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.
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 bit • Pipe wrench or appropriate size crescent wrench set
• Manual shutoff valve
59D1015 5
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.
Manual Pressure Milli-Volt
Regulator Pressure: Setting: 4.0" w.c. Regulator Pressure Setting: 3.5" w.c.
Pilot Regulator: 3.5" w.c.
Gas Inlet Pressure: Max. 101/2" w.c. Gas Inlet Pressure: 101/2" w.c.
Min. 5" w.c. Min. 5" w.c..
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
HVFL18NM MANUAL 28,000 18,000
HVFL18NV MILLIVOLT 28,000 20,000
HVFL24NM MANUAL 36,000 20,000
HVFL24NV MILLIVOLT 36,000 24,000
PROPANE/LPG
Note: An external regulator is required to reduce supply pressure to a maximum of 13" w.c.
Manual Pressure Milli-Volt
Regulator Pressure Setting: 10" w.c. Regulator Pressure Setting: 10" w.c
Gas Inlet Pressure: Max. 13" w.c. Gas Inlet Pressure: Max. 13" w.c.
Min. 11" w.c. Min. 11" w.c..
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
HVFL18PM MANUAL 28,000 18,000
HVFL18PV MILLIVOLT 28,000 20,000
HVFL24PM MANUAL 36,000 24,000
HVFL24PV MILLIVOLT 36,000 27,000
6 59D1015
PRODUCT FEATURES AND SPECIFICATIONS
IGNITION CONTROLS
Piezo ignitor allows ignition of the pilot without the use of matches or batteries.
Manual 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.
HI/LOW - Variable position corresponding to desired flame height.
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.
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 available 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 milli-volt (thermopile) generator to provide power for remote activation.
59D1015 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 m
unconfined space is defined as a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour (4.8 m3 per 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.
3
per kw) of the aggregate input rating of all appliances installed in that space. An
8 59D1015
W
H
GENERAL INSTALLATION INFORMATION
Counter
Fireplace
Figure 1 - Example of a Large Room with 1/2 Wall Divider
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:
L1 = 151/2 Ft., 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
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
59D1015 9
A
C
D
B
FIREPLACE AND HEARTH DIMENSIONS
This appliance is for installation only in a solid-fuel burning masonry or UL127 factorybuilt 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
WARNING
logs.
Use manufacturer's installation and clearance requirements as defined in their manual.
The HVFL Series unvented room heater is approved for installation into the following unvented fireplaces:
GCUF Series Fireboxes Magnum36/42 or Lo-Rider36
NOTE: HVFL24 log set will not fit into GCUF32 fireboxes.
The HVFL 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.
Model A B C D
HVFL18 18" 13
HVFL24 221/4" 131/4" 281/2" 17"
HVFL24 with 30" Logs 251/2" 131/4" 321/2" 17"
1
/4" 27" 17"
Figure 2 - Hearth Minimum Dimension
10 59D1015
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"
1
0 to 1
From 1
Greater than 3" ANY BARRIER GREATER THAN THREE INCHES (3")
Glass door frames
with adjustable
louvers should have
the louvers fully
open while the unit is
in operation.
/2" 16"
1
/2" to 3" 16"
PLACED IN FRONT OF THE GAS LOG SET IS NOT
RECOMMENDED BY THE MANUFACTURER.
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
unit. (Refer to Table).
Figure 3 - Reference Drawing of a Natural Flame Log Set in an Enclosure
X
Depth of fireplace/firebox.
(Refer toTable).
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.
59D1015 11
16"
42"
CLEARANCES AND HEIGHT REQUIREMENTS
The dimensions shown in Figures 4 through 12 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.
Figure 4 - Sidewall and Ceiling Clearances
12 59D1015
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 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
Figure 5 - Measuring Heat Resistant Material
HEAT RESISTANT REQUIREMENTS FOR SAFE INSTALLATION
MATERIAL
MEASUREMENT HVFL18 HVFL24
12" or more Hood not required. Hood not required.
8" to less than 12" Hood not required. Extend heat resistent material to 12"
Less than 8" Extend heat resistant Extend heat resistant material to at
material to at least 8" least 8" and install hood. See Figure
and install hood. 5. OR, extend heat resistant mater See Figure 5. ial to a height of at least 12".
or install hood. See Figure 5.
59D1015 13
Heater in
Fireplace or
Firebox
8" or More of
Heat Resistant
Material
Hood
CLEARANCES and HEIGHT REQUIREMENTS
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, then refer to Table B.
Figure 6 - Measuring Heat Resistant Material for Mantel
HEAT RESISTANT REQUIREMENTS FOR SAFE INSTALLATION WITH WOODEN MANTEL,
MATERIAL SHELF OR OTHER COMBUSTIBLE PROJECTION
MEASUREMENT
HVFL18 HVFL24
12" or more Hood not required. Observe profiles (side Hood not required. Observe profile (side
elevations) shown in
8" to less than 12" Install hood and observe profiles shown Install hood and observe profiles shown
in
resistant material to at least 12" and observe resistant material to at least 12" and observe
profiles shown in Figure 7, page 15. profiles shown in Figure 9, page 16.
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
resistant material to at least 12" and observe resistant material to at least 12" and observe
profiles shown in Figure 8, page 15. profiles shown in Figure 9, page 16.
Figure 8, page 15; OR extend heat in Figure 7, page 15; OR extend heat
Figure 8, page 15; OR extend heat in Figure 7, page 15; OR extend heat
Figure 7, page 15. elevations) shown in Figure 9, page 16.
TABLE B - Heat Resistant Material Heights and Mantel Location
14 59D1015
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