Vermont Casting VL18, VL21, VL24, VL18LP, VL24LP User Manual
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Installation and Operation Instructions for
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Vent-Free Gas Log Sets*
Models: VL18, VL21 and VL24 (Natural Gas)
VL18LP, VL21LP and VL24LP (Propane)
Decorative Gas Appliances for
Installation inSolid-Fuel Burning Fireplaces.
ANSI Z21.11.2b-2004, Unvented Heaters, and
Tested and listed to
Z21.60b-2004; CGA 2.26b-2004
W A R N I N G
If the information in this manual is not followed exactly, a fire or explosion may result, causing property
damage, injury, or loss of life.
— Do not store or use gasoline or other flamma-
ble 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.
• 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.
INSTALLER PLEASE NOTE:
DO NOT begin installation of this gas logset
until all instructions have been read and
understood.
Installation and service must be performed by
a qualified agency, individual, firm, corpora
tion, or company, experienced in the installa
tion, repair, and servicing of this type of gas
appliance. Do not modify, alter or tamper with
any part of this heater, control, or logs.
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.
*These logsets are not for exterior use.
ATTENTION
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W A R N I N G
CARBON MONOXIDE POISONING MAY LEAD TO DEATH
When used without fresh air, vent-free log sets may give off carbon monoxide, an odorless, poisonous gas.
Some people - pregnant women, people with heart or lung disease, anemia, or persons under the influence of alcohol, and
persons at high altitudes are more affected by carbon monoxide than others.
Early signs of carbon monoxide poisoning resemble the flu - headache, dizziness, and/or nausea. If you have these signs, the
heater may not be installed or working properly. GET FRESH AIR AT ONCE!
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
Have the heater serviced before using it again.
20002538 1/07 Rev. 8
General Information
In order to assure a safe and effective installation, only a qualified service person who is
familiar with the building codes and installation
techniques appropriate to your area may install
and service this appliance.
The Logsets have been designed and tested to operate safely
when installed according to the installation instructions contained in this manual. Read all instructions before starting the
installation.
In the Commonwealth of Massachusetts, all gas fitting
and installation of this heater shall only be done by a
licensed gas fitter or licensed plumber.
• This appliance is for supplemental heating only, It should
not be used as the primary heat source for a dwelling.
• The vent-free gas logset must be installed only in a fire-
place constructed of noncombustible material.
• The logset should be inspected before use and at least
annually thereafter. More frequent cleaning may be necessary
because of excessive lint from carpeting or bedding material.
• In the United States, the installation and operation must
conform to local codes or, in the absence of local codes, with
the National Fuel Gas Code, ANSI Z223.1/NFPA 54, latest
edition, CSA-B149 Installation Code, and with the National
Electrical Code, ANSI/NFPA70 (latest edition).
• The gas logset 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 excess of 1/2
p.s.i.g. (3.5 kPa) The gas logset 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 p.s.i.g. (3.5
kPa)
• Do not, under any circumstances, burn solid fuel (wood,
paper, coal) in the fireplace where you have installed your log
set. Do not use it for cooking. Put nothing on top of the logs.
• The logset must be compatible with its fuel. Natural gas
requires different hardware than propane. Never attempt to
use natural gas with a propane logset or vice versa.
• For a propane burning logset, the supply tank must include
a high to low gas pressure regulator. The tank
doors. Do not, under any circumstances, locate supply tanks
inside any structure.
must be out-
• The fireplace must include a screen made of chain mesh
or a similar material. You must keep the screen closed at all
times during the operation of the logset; it will protect you in
the event of an explosion.
• WARNING: If the fireplace contains glass doors, they must
remain open at all times during the operation of the logset,
allowing combustion air to circulate.
• In order to avoid any possible gas leaks, apply pipe joint
compound to all non-flared threaded connections involved
in this installation. For propane, the joint compound must be
resistant to the corrosive action of propane.
• To check for leaks, always use a soapy water solution or a
sniffer.
Never test by using an open flame.
• The area around the gas logset must be free of all combus-
tible materials, especially gasoline or other highly flammable,
vapor producing liquids.
• Due to high temperatures, locate this logset away from both
high traffic areas and furniture and draperies.
• Children and adults alike should be aware of the high
surface temperatures; to avoid the risk of burns or ignition of
clothing they should stay away.
• Do not touch any part of the logset other than the controls
while it is operating or immediately after you turn it off.
• Supervise young children and pets carefully when they are
in the room where the logset is operating.
• Do not place clothing or other flammable material on or
near the logset.
• Make sure that any safety screen or guard, removed during
servicing, has been replaced before you use the logset.
• Do not, under any circumstances, install the logset in any
bedroom, bathroom, other small, enclosed room, mobile
home or recreational vehicle.
• Do not install the logset in a drafty area or use it with any
aftermarket blower system that may cause drafting and consequently alter the flame pattern.
• It is imperative that you keep clear all burner areas, control
compartments and passageways for circulating air.
• Do not move the logset in any way that might dislodge the
logs from their fixed positions. If you bump the logset check to
see if you have dislodged anything.
• Vent-free logsets require additional fresh air. You may sup-
ply additional air with any combination of: opening windows
or doors; or by operating a central furnace blower or exhaust
fan.
• Provide adequate clearances around air openings into the
combustion chamber and adequate accessibility clearance
for servicing and proper operation. NEVER obstruct the front
opening of the fireplace.
W A R N I N G
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This appliance is for installation in a masonry
fireplace with a working flue, a U.L.-127 listed
manufactured solid-fuel burning fireplace or in a
CFM Corporation vent free fireplace.
N O T I C E
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 pages 5 and 6.
This appliance operates as an unvented domestice room
heater when fitted to a masonry or factory-bilt woodburning fireplace with the flue damper closed, or as a decorative
appliance when the flue damper is fully open. It must not be
used for any other purpose and must be fitted in a masonry or
factory-built fireplace or ventless firebox enclosure.
Avoid propane tank dropping below 25% full. This will help
keep soot from occurring.
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20002538
Installation Requirements
A
B
D
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The fireplace must meet the minimum dimensions listed below. (Fig. 1) Do not install the logset if the fireplace does
not meet these minimums.
Min. Fireplace Dimensions Inlet Supply Min. Max. Air
Logset Gas Front Rear Overall Overall Pressure (w.c.) Manifold Input Input Shutter
Width Width Depth Height Min. Max. Pressure BTU/hr BTU/hr Setting
18” VL18 21” 16
21” VL21 Natural 21” 18
24” VL24 25” 18
Cop. SIT
18” VL18LP 21” 16
21” VL21LP Propane 21” 18
24” VL24LP 25” 18
A. Front Width B. Rear Width C. Depth D. Height
Fig. 1 Minimum fireplace dimensions.
Pressure Test Points
Copreci Valve: 1/8” N.P.T. plugged tapping is provided
on the outlet side of the gas control for a test manifold
pressure.
SIT Valve: Inlet and manifold taps are provided on the
right side of the valve.
Proposition 65 Warning:
burning or oil fired appliances, and the products of
combustion of such fuels, contain chemicals known
to the State of California to cause cancer, birth defects and other reproductive harm.
California Health & Safety Code Sec. 25249.6
Fuels used in gas, wood-
¹⁄₂” 13¹⁄₂” 17” 5.0 10.5 3.5 15,000 24,000 .188” Open
¹⁄₂” 13¹⁄₂” 17” 5.0 10.5 3.5 18,000 32,000 .250” Open
¹⁄₂” 13¹⁄₂” 17” 5.0 10.5 3.5 18,000 35,000 .375” Open
¹⁄₂” 13¹⁄₂” 17” 11.0 14.0 8.5 10.0 15,000 24,000 Full Open
¹⁄₂” 13¹⁄₂” 17” 11.0 14.0 8.5 10.0 18,000 32,000 Full Open
¹⁄₂” 13¹⁄₂” 17” 11.0 14.0 8.5 10.0 18,000 35,000 Full Open
Odor During Operation
Neither natural gas nor propane gas give off an odor
when burned. The nature of a vent free combustion
system, however, is such that odors may occasionally
be produced during heater operation when impurities
exist in the immediate area. Cleaning solutions, paint,
solvents, cigarette smoke, candles, adhesives, new carpet or textiles, etc., all can create fumes. These fumes
may mix with combustion air and can create odor. Such
odors will disappear over time, however, the condition
can be alleviated by opening a window or otherwise
providing additional ventilation to the area.
FD370-2
Input ratings are shown in BTU per hour and are
certified without deration from elevations up to
4,500 feet (1,370 m) above sea level.
Nuisance outages may occur at altitudes above
4,500 feet (1,370 m) if dirt, dust, lint and/or cobwebs are allowed to accumulate on burner and/or
ODS pilot. Monthly inspection and cleaning is
recommended for altitudes above 4,500 feet
(1,370 m)
For elevations above 4,500 feet (1,370m) in USA,
installations must be in accordance with the
current ANSI Z223.1/NFPA 54 and/or local codes
having jurisdiction.
In Canada, please consult provincial and/or local
authorities having jurisdiction for installations at
elevations above 4,500 feet (1,370 m)
High Elevations
320002538
Planning
Planning the installation is an important first step. It will
save time and money later in the actual installation. In
planning the installation, consider:
• Where the heater will be located.
• All components needed to complete the installation.
• DO NOT use this heater in bedrooms, bathrooms,
mobile homes or in recreational vehicles.
• Installation and repair should be done by a qualified
service person.
• DO NOT use this heater if any part has been under
water. Immediately call a qualified technician to inspect
the appliance and replace any part of the control system and any gas control which has been under water.
• When used as an unvented heater, always ensure
that there is adequate ventilation from the room where
the appliance is operating. This appliance is equipped
with an ODS (oxygen depletion sensor) pilot light safety
system designed to shut off the appliance if enough
fresh air is not available.
THIS APPLIANCE MUST NOT BE USED WITH GLASS
DOORS IN CLOSED POSITION.
Keep the burner and control compartment clean. See
installation and operating instructions supplied with the
heater.
WARNING: 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 2-3
HOURS WITH THE BURNER AT ITS HIGHEST SETTING. PROVIDE MAXIMUM VENTILATION BY OPENING WINDOWS, DOORS AND THE CHIMNEY FLUE
TO ALLOW ODORS TO DISSIPATE. ANY ODORS
REMAINING AFTER THIS INITIAL BREAK-IN WILL BE
SLIGHT AND WILL DISAPPEAR WITH CONTINUED
USE.
State or local codes may only allow operation of this
appliance in vented configurations. Check your state or
local codes. If unvented room heaters are not permitted, the fireplace vent damper must be locked at the
minimum vent area required by local codes or by the
National Fuel Gas Code (ANSI Z223.1/NFPA 54, latest
edition) and CSA-B149.1 Installation Codes for Gas
Burning Appliances.
When installed as a Decorative Gas Appliance for
installation in a solid-fuel burning fireplace, a minimum
permanent free opening of 29 square inches must be
maintained with a fixed damper stop provided with the
appliance. Minimum flue size for this appliance is 29
square inches.
Installation Precautions
1. This vent-free gas appliance and its components
have been tested and will operate safely when installed
in accordance with this Installation Manual. Read all
instructions before starting the installation, and follow these instructions carefully during installation to
maximize the appliance’s benefit and safety. Failure to
follow them will void your warranty and may present a
fire hazard.
2. After opening the carton, refer to Replacement Parts
illustrationon Page 17, and remove the various parts.
Report to your dealer if any parts were damaged in
shipment.
The CFM Corporation warranty will be voided by,
and CFM Corporation disclaims any responsibility
for, the following actions:
• Installation of any damaged appliance.
• Modification of the appliance.
• Installation other than as instructed by CFM
Corporation.
• Improper positioning of the gas logs.
• Installation and/or use of any component part
or accessory not manufactured or approved by
CFM Corporation, not withstanding any independent testing laboratory or other third-party
approval of such component part or accessory.
Any such action may create a possible fire hazard.
Consult your local building codes.
W A R N I N G
Improper installation, adjustment, alteration,
service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or additional information, consult
a qualified installer, service agency or the gas
supplier.
This heater shall not be installed in a confined
space unless provisions are provided for adequate
combustion and ventilation air.
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20002538
Installation Requirements
Fresh Air Requirements for
Combustion and Ventilation
W A R N I N G
This heater must have fresh air for proper operation. If it does not, poor fuel combustion could
result. Read the following instructions to ensure
proper fresh air supply for this and other fuelburning appliances in your home.
Modern construction standards have resulted in homes
that are highly energy-efficient and that allow little heat
loss. Your home needs to breathe, however, and all
fuel-burning appliances need fresh air to function properly and safely. Exhaust fans, clothes dryers, fireplaces
and other fuel burning appliances use the air inside the
building. If the available fresh air supply is insufficient to
meet the demands of these appliances, problems can
result.
The vent-free logsets have specific fresh air requirements. You must determine that these requirements
will be met within the space where the appliance will be
installed. The following information will help you ensure
that adequate fresh air is available for the heater to
function properly.
Provide for Adequate Ventilation
Any space within a home can be classified in these
categories:
1) Unusually tight construction
2) Confined space
3) Unconfined space
First, determine which classification defines the intend
ed installation space.
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Unusually Tight Construction
You must provide additional fresh air if the space falls
into this classification. Unusually Tight Construction is
defined as construction wherein:
a. Walls and ceilings exposed to the outside atmo
sphere have a continuous water vapor barrier with a
rating of one perm or less, with openings gasketed or
sealed, and
b. weather stripping has been added on openable windows and doors and
c. caulking or sealants are applied to areas such as
joints around windows and door frames, between sole
plates and floors, between wall and ceiling joints, be
tween wall panels, at penetrations for plumbing, electrical and gas lines and at all other openings.
If your home meets all of the above criteria, you must
provide additional fresh air for the appliance as detailed
on Page 6.
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If your home does not meet the above criteria, follow
the procedure below.
Determine If You Have a Confined
or Unconfined Space
Use the following formula to determine if you have a
confined or unconfined space.
Space is defined as the room in which you will install
the heater, plus any adjoining rooms with doorless pas
sageways or ventilation grilles between the rooms.
The National Fuel Gas Code defines a confined space
as a space whose volume is less than 50 cubic feet per
1,000 BTU per hour input rating (4.8m3 per Kw) of the
aggregate (total) input rating of all appliances installed
in that space and an unconfined space as a space
whose volume is not less than 50 cubic feet per 1,000
BTU per hour (4.8m3 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.
1. Determine the volume of space (length x width x
height). Include adjoining rooms connected by doorless
passageways or ventilating grilles.
Example: A room that is 18’ x 12’ x 8’ has a volume of
1728 cubic feet. An adjoining open kitchen that is 10’
x 12’ x 8’ has a volume of 960 cubic feet. An adjoining
open dining room is 12’ x 12’ x 8’ with a volume of 1152
cubic feet. The total volume is 3840 feet.
2. Divide the volume of space by 50 cubic feet. The
result is the maximum BTU/hour the space can support.
Example: 3840 cubic feet divided by 50 = 76.8 or
76,800 BTU/hour.
3. Add the BTU/hour ratings of all fuel-burning appliances installed in the same space, including the following:
Gas Water Heater Gas Furnace
Gas Fireplace Logs Vent-free Gas Heater
Vented Gas Heater* Other Gas Appliances*
*Do not include Direct-vent appliances as these use
outdoor air for combustion and vent to the outdoors.
Example:
Gas Range 55,000 BTU/hour
Vent-free Logset +25,000 BTU/hour
Total 80,000 BTU/hour
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520002538
4. Compare the maximum BTU/hour rating the space
can support with the total BTU/hour used by the appliances.
Example: 76,800 BTU/hour the space can support
80,000 BTU/hour used by appliances
In this example, the maximum BTU/hour that the space
can support is less than the total used by the appliances. The space is considered to be Confined Space.
Additional air must be provided to meet the requirements of the vent-free gas log set.
The installation and the provisions for combustion and
ventilation air must conform with the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, or the CSA-B149 Installation Code (Series).
A confined space may be ventilated in two ways:
A. Open or provide at least two ventilating grilles to an
adjoining unconfined space. (Fig. 2)
Each of the two grilles must provide an opening of at
least 50 square inches, with all opening dimensions being at least 3”. One grille must be within 12” of the ceiling; the other within 12” of the floor. (If the total exceeds
100,000 BTU/hour, additional grilles will be needed.)
B. Vent the room directly to the outdoors. (Provide one
square inch of opening for each 4,000 BTU/hour)
For further information on ventilation guidelines and sizing specifications, follow the National Fuel Gas Code/
NFPA 54/ANSI Z223.1, Section 5.3.
If the total BTU/hour used by the appliances is less than
the maximum BTU/hr the space can support, the room
meets the Unconfined Space criteria and no further
ventilation is needed.
W A R N I N G
This heater shall not be installed in a confined
space or unusually tight construction unless
provisions are made for adequate combustion
and ventilation air.
W A R N I N G
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, 1992 Sections 5.3, or applicable codes.
WARNING:
fuel burning fireplace, the chimney flue and firebox must
be cleaned of soot, creosote and loose paint by a qualified chimney cleaner.
Before installing the gas logset in a solid-
Option 1 -
Vents to
Adjoining
Rooms
Fig. 2 Ventilaton options for confined spaces.
12”
Option 3 -
Vents to
Adjoining
Room
Option 2 -
Remove Door to
Adjoining Rooms
12”
VO370-2
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20002538
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