Air For Combustion & Ventilation - Procom SSU320RHN-GB Owner's Manual

WARNING:
shall not be installed in a confined
space or unusually tight construc -
tion unless provisions are pro -
vided for adequate combustion and
ventilation air. Read the following
instructions to insure proper fresh
air for this and other fuel-burning
appliances in your home.
PROVIDING 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 classifica -
tions:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 5 through 6
will help you classify your space and
provide adequate ventilation.
DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION
Determining if You Have a Confined or Unconfined Space
Use this worksheet to determine if you have a confined or unconfined space.
Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways
or ventilation grills between the rooms.
1. Determine the volume of the space
Length×Width×Height=
Example: Space size 20ft. (length)×16ft.(width)×8ft. (ceiling height)=2560cu. ft. (volume of space)
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.
(volume of space)÷50 cu. ft.= 51.2 or 51,200(Maximum Btu/Hr the space can support)
AIR FOR COMBUSTION AND VENTILATION
Confined and Unconfined Space
This heater
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
m per kw) of the aggregate input rating
3
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
kw) of the aggregate input rating of
all appliances installed in that space.
Rooms communicating directly with the
space in which the appliances are in -
stalled*, through openings not furnished
with doors, are considered a part of the
unconfined space.
This heater shall not be installed in
a confined space or unusually tight
construction unless provisions are
provided for adequate combustion and
ventilation air.
* Adjoining rooms are communicating
only if there are doorless passageways
or ventilation grills between them.
cu.ft. (volume of space)
per
3
5
Unusually Tight Construction
The air that leaks around doors and win -
dows may provide enough fresh air for
combustion and ventilation. However, in
buildings of unusually tight construction,
you must provide additional fresh air.
Unusually tight construction is defined
as construction where:
a) Walls and ceilings exposed to the out -
side atmosphere have a continuous
water vapor retarder with a rating of
one perm (6×10 kg per pa-sec-m
-11
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 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.
If your home meets all of the three
criteria above, you must provide addi -
tional fresh air. See Ventilation Air From
Outdoors .
If your home does not meet all of the
three criteria above, proceed to De -
termining Fresh-Air Flow For Heater
Location.
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2