Heatmaster MGVF-MV-20LP, MGVF-MV-20NAT, MGL-20 Installation And Operating Instructions Manual

UNVENTED (GAS LOG) ROOM HEATER

INSTALLATION AND OPERATING INSTRUCTIONS

MirageGlo™ Gas Log Set

MGVF-MV-20LP & MGVF-MV-20NAT Burner Units

with MGL-20 Log Set

WARNING:

maintenance can cause property damage, personal injury or loss of life.
Refer to this manual for information.

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 4 of these instructions.

Improper installation, adjustment, alteration, service or

This appliance is for supplemental heating only. It should not be

used as the primary heat source for a dwelling.

- Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other

- WHAT TO DO IF YOU SMELL GAS

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- Installation and service must be performed by a qualified installer, service agency or the gas supplier.

WARNING: 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.

appliance.

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.

IMPORTANT:

READ INSTRUCTIONS CAREFULLY BEFORE BEGINNING

INSTALLATION OF THIS ROOM HEATER.

ATTENTION INSTALLER:

REVIEW AND LEAVE THESE INSTRUCTIONS WITH
THE CUSTOMER FOR FUTURE REFERENCE.

IM-105 3/01

DO NOT TAMPER WITH PILOT LIGHT SAFETY SYSTEM

This heater is equipped with a PILOT LIGHT SAFETY SYSTEM designed to turn off the heater if not
enough fresh air is available. If the heater shuts off, do not relight until you have provided fresh air. If heater
keeps shutting off, have it serviced by a qualified installer, service agency or the gas supplier. Keep burner and
control compartment clean.

WARNING

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When used without fresh air, this room heater may give off CARBON MONOXIDE, an odorless and
poisonous gas.

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Early signs of carbon monoxide poisoning resemble the flu. with headache, dizziness and/or nausea. If you
have these signs, heater may not be working properly. Get fresh air at once! Have heater serviced.

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Some people - pregnant women, persons with heart or lung disease, anemia, those under the influence of
alcohol and those at high altitudes are more affected by carbon monoxide than others.

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Due to high surface temperatures, the appliance should be located out of traffic and away from furniture
and draperies.

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Children and adults should be alerted to the hazard of high surface temperature and should stay away to
avoid burns or clothing ignition.

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Young children should be carefully supervised when they are in the same room with the appliance.

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Adults must be present at all times while operating this appliance.

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Do not place clothing or other flammable material on or near the appliance.

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Do not leave this appliance operating while unattended or while occupants are sleeping.

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Any safety screen or guard removed for servicing an appliance must be replaced prior to operating the
heater.

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Installation and repair should be done by a qualified service person. The appliance should be inspected
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 of the appliance be kept clean.

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“WARNING: Any change to this heater or its controls can be dangerous.”

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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.

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This appliance is for installation in a solid-fuel burning fireplace or an approved ventless firebox enclosure
only.

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Do not allow fans to blow directly into the fireplace. Avoid any drafts that alter burner flame patterns.

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Do not use a blower insert, heat exchanger insert or other accessory not approved for use with this heater.

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WARNING

♦ This room heating appliance is factory designed to produce a flame having a clean and virtually
transparent appearance. If at any time the appliance begins to appear abnormal due to excessive
yellow flames, noticeable odor, or any carbon deposits on the logs, immediately turn the appliance to the
“OFF” position and contact a qualified service technician or the gas company.

♦ While operating this appliance using propane (LP) gas, the flame burning characteristics may vary as the
gas level in the LP tank approaches empty or less than 1/4 full.

♦ Unvented gas logs are intended for supplemental heat and are not to be used as a primary heating source.
When operated for an extended period of time this room heating appliance can produce moisture that
could create condensation , requiring additional ventilation to the home. (example: partially open a
window, partially open the fireplace vent if applicable).

♦ Do not remove from this unit any of the attached metal plates which contain important safety and

operating information.

IMPORTANT INFORMATION

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This room heater is design certified by CSA International under the ANSI Z21.11.2b-1998 Unvented
Heaters, ANSI Z21.60-1996 CGA 2.26-M96, Decorative Appliances for Installation in Solid-fuel Burning
Fireplaces. ANSI Z21.60-1996 CGA 2.26-M96 only applies to manual control valve units and does not
apply to the thermostat control units. State or local codes may only allow operation of this appliance in a
vented configuration. Check your state or local codes.

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A fireplace screen must be in place while the appliance is operating and, unless other provisions for
combustion air are provided, the screen shall have an opening(s) for introduction of combustion air.

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The flue damper in an existing vented solid-fuel burning fireplace must be closed at all times when
operated as an unvented room heater.

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Solid-fuels shall not be burned in a fireplace where an unvented room heater is installed.

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Always have glass fireplace doors open completely and have fireplace screen closed when operating this
appliance.

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This unvented room heater shall not be installed in a bedroom, bathroom, or any room where an occupant
could possibly be sleeping.

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When installing this appliance in a fireplace with a mantle, always follow guidelines listed in the
Installation Clearances section of this brochure.

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If a hood is required to be installed on your fireplace due to mantle clearances, contact your dealer or
HEATMASTER, INC. for availability of the hood.

♦

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 gas control system which has been
under water.

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COMBUSTION AND VENTILATION PROVISIONS

WARNING: This heater shall not be installed in a confined space or unusually tight construction

unless provisions are provided for adequate combustion and ventilation air.

Confined Space and Unconfined Space

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 m³ per kw) of the aggregate 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 (4.8 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.

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.

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 x10-11 kg per pa-sec-m²) or less with openings gasketed or sealed,
and

b. Weather stripping has been added to 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 joists, between wall panels, at
penetrations for plumbing, electrical, and gas lines, and at other openings.

Instructions for determining maximum Btu's for a room
Step 1

This calculation is for combustion and ventilation air provisions only and is not intended to be used
for sizing for heating comfort. To determine the maximum Btu's allowed for a given room size you
will need to calculate the volume of the room in cubic feet. To perform this calculation, fill in the
table below and multiply the room's width, length and height to obtain the room volume in cubic feet.

ROOM ROOM ROOM ROOM VOLUME

LENGTH WIDTH HEIGHT IN CUBIC FEET

X X =

Example: If your room is 20 feet in length, 16 feet wide and has an 8 foot ceiling height, the calculation

would be as follows: 20 x 16 x 8 = 2,560 cubic feet.

Step 2

Divide the room volume by 50 cubic feet to determine the maximum Btu per hour the room can utilize.

Example: Using the above example: 2,560 cubic feet divided by 50 = 51.2 x 1,000 = 51,200 Btu's.

If the rate of your appliance plus any other gas appliances installed in the space is rated at more Btu's than the
example calculated above, you must follow instructions for confined space. See shaded WARNING above.
If your appliance is rated at less Btu's than the example calculated above, then your area is considered
unconfined space.

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INSTALLATION CLEARANCES AND INFORMATION

To ensure a safe installation in a masonry or approved factory built fireplace, the following instructions
must be carefully followed.

A) Minimum clearance from the side of the

fireplace opening to any combustible wall
should not be less than 15 inches.

B) Minimum clearance from the top of the

fireplace opening to any combustible ceiling
should not be less than 42 inches.

C) Minimum clearance from the side of the

fireplace opening to part of a mantle piece
should not be less than 6 inches. See figure
at right.

Minimum mantle clearance when unit is installed as a vent free appliance in a pre-existing fireplace.

Minimum Mantle Clearance Without Hood Minimum Mantle Clearance With Hood

Note:
The stated installation clearances provide the safest distance for combustible materials to ensure that

walls, ceilings, and mantel components will not be affected by heat discoloration, warpage, or possible fire.
Each appliance installation presents a different set of variables which can create problems beyond the control of
the gas log manufacturer. It is the responsibility of the installer to stay within the minimum clearances stated
and set forth by the manufacturer within this instruction manual.

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