4
Mr. Heater | Unvented Natual Gas Fired Room Heater
Operating Instructions and Owner’s Manual
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
Figure 1
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. Read the
FRESH AIR FOR COMBUSTION AND
VENTILATION
section to insure proper
fresh air for this and other fuel-burning
appliances in your home.
WARNING: This heater shall not be
installed in a room or space unless the
required volume of indoor combustion
air is provided by the method described
in the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, the International Fuel
Gas Code, or applicable local codes.
Local Codes
Install and use heater with care.
Installation must conform to local codes
or in the absences of local codes, use the
latest edition of National Fuel Gas Code,
ANSI Z223.1/NFPA 54.
Unpacking
1. Remove heater from carton.
2. Remove all protective packaging
applied to heater for shipment.
3. Check heater for any shipping
damage. If heater is damaged,
promptly inform dealer where you
bought heater.
FRESH AIR FOR COMBUSTION
AND VENTILATION
Establishing Adequate
Ventilation
The following are excerpts from National
Fuel Gas Code, NFPA 54/ ANSI Z223.1,
Section 5.3, Air for Combustion and
Ventilation. All spaces in homes fall into
one of the three following ventilation
classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
This heater must not be installed in
a confined space or unusually tight
construction unless provisions are
provided for adequate combustion and
ventilation air. The information on pages
4 and 5 will help you classify your space
and provide adequate ventilation.
Unusually Tight Construction
If your home meets all of the three
following criteria, you must provide
additional fresh air. See Ventilation from
Outdoors, page 5.
Unusually tight construction is defined as
construction where:
1. Walls and ceilings exposed to the
outside atmosphere have a continuous
water vapor retarder with a rating of
one perm (6 x 10
-11
kg per pa-sec-m
2
)
or less with openings gasketed or
sealed and
2. Weather stripping has been added on
operable windows and doors, and
3. Caulking or sealants are applied to
areas such as joints around windows
and door frames, between wall-
ceiling joints, between wall panels, at
penetrations for plumbing, electrical,
and gas lines, and at other openings.
If you home does not meet all of the
three criteria above, see Determining the
Type of Heater Location Space, below.
Confined Space and Unconfined
Space
The National Fuel Gas Code, NFPA
54/ 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 m
3
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 m
3
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.
*Adjoining rooms are communication
only if there are doorless passageways or
ventilation grills between them.
Determining The Type Of
Heater Location Space
Use this method to determine if you have
a confined or unconfined space.
Note:
The space includes the room in
which you install heater plus any adjoining
rooms with doorless passageways or
ventilation grills between the rooms.
1. Find the volume of the space by
multiplying room length x width x
height.
Example: Space size 18ft (length) x 18ft.
(width) x 8ft. (height) = 2592
If additional ventilation to adjoining room
is supplied with grills or openings, add
the volume of these rooms to the total
volume of the space.
2. Divide the space volume by 50 cubic
feet to determine the maximum Btu/
hr the space can support.
Example: 2592 cu.ft. (volume of space)
/ 50 cu.ft. = 51.8 or 51,800 (maximum
Btu/hr the space can support)
3. Add the Btu/hr of all the fuel-
burning appliances in the space such
as, Vent–free heater, Gas water
heater, Gas furnace, Vented gas
heater, Gas fireplace logs, and other
gas appliances*
Product Features
INST
ALLATION
