HydroTherm 70-195, Инструкция по установке и эксплуатации

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C. AIR FOR COMBUSTION AND
VENTILATION
1. Adequate combustion air and ventilation air must be
provided for this appliance in accordance with the
section of the
National Fuel Gas Code entitled, “Air
for Combustion and Ventilation” or applicable
provisions of the local building code. Subsections 2
through 8 as follows are based on the
National Fuel
Gas Code requirements.
2. Required Combustion Air Volume: The total required
volume of indoor air is to be the sum of the required
volumes for all appliances located within the space.
Rooms communicating directly with the space in
which the appliances are installed and through
combustion air openings sized as indicated in
Subsection 3 are considered part of the required
volume. The required volume of indoor air is to be
determined by one of two methods.
a. Standard Method: The minimum required
volume of indoor air (room volume) shall be 50
cubic feet per 1000 BTU/Hr (4.8 m
3 /kW). This
method is to be used if the air infiltration rate is
unknown or if the rate of air infiltration is known
to be greater than 0.6 air changes per hour. As
an option, this method may be used if the air
infiltration rate is known to be between 0.6 and
0.4 air changes per hour. If the air infiltration rate
is known to be below 0.4 then the
Known Air
Infiltration Rate Method must be used. If the
building in which this appliance is to be installed
is unusually tight. The air infiltration rate shall be
determined.
b. Known Air Infiltration Rate Method: Where
the air infiltration rate of a structure is known, the
minimum required volume of indoor air for
appliances other than fan assisted and for the
boiler shall be determined as follows:
where:
Iother = Input of appliances other than fan
assisted in Btu/hr
ACH = air change per hour (percent of the
volume of the space exchanged per
hour, expressed as a decimal)
For fan assisted appliances, calculate the required
volume of air using the following equation:
Ifan = Input of the fan assisted appliances in
Btu/hr
Note: These calculations are not to be used for
infiltration rates greater than 0.60 ACH.
3. Indoor Air Opening Size and Location: Openings
connecting indoor spaces shall be sized and located
as follows:
a. Combining spaces on the same floor:
Provide two permanent openings communicating
with additional spaces that have a minimum free
area of 1 in
2
per 1000 Btu/hr (22 cm
2
per 1000 W)
of the total input rating of all gas fired equipment
but not less than 100 in
2
(645 cm
2
). One opening
is to begin within 12 inches (305 mm) from the
top of the space and the other is to begin within
12 inches (305 mm) from the floor. The
minimum dimension of either of these openings
shall be 3 inches (76 mm). See Figure 1.1 for an
illustration of this arrangement.
b. Combining spaces on different floors:
Provide one or more permanent openings
communicating with additional spaces that have
a total minimum free area of 2 in
2
per 1000
Btu/hr (44 cm
2
per 1000 W) of total input rating
of all equipment. See Figure 1.2 for an
illustration of this arrangement.
4
INSTALLATION AND OPERATING INSTRUCTIONS
15 ft 3
I
fan
ACH 1000 Btu /hr
Required Volume
fan
[
Figure 1.1: Air Openings – All Air from Indoors
on the Same Floor
Figure 1.2: Air Openings – All Air from Indoors
on Different Floors
21 ft 3 I other
ACH 1000
Btu
/hr
Required Volume
other
[
[
[