Dunkirk 3ES1 00C Kurulum ve Kullanım Kılavuzu - Sayfa 5
Kazan Dunkirk 3ES1 00C için çevrimiçi göz atın veya pdf Kurulum ve Kullanım Kılavuzu indirin. Dunkirk 3ES1 00C 20 sayfaları. Oil-dired cast iron steam boilers
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Fresh Air for Combustion
WARNING
NOTE
Be sure to provide enough fresh air for combustion. Enough air ensures
proper combustion and assures that no hazard will develop due to
the lackof oxygen.
If you use a fireplaceor a kitchen or bathroomexhaustfan, you
shouldinstallan outsideair intake.Thesedeviceswill robthe boiler
andwaterheaterof combustion air.
You must provide for enough fresh air to assure proper combustion. The fire
in the boiler uses oxygen. It must have a continuous supply. The air in a
house contains only enough oxygen to supply the burner for a short time.
Outside air must enter the house to replace that used by the burner. Study
foIIowing exampIes 1 and 2 to determine your fresh air requirements.
EXAMPLE 1: Boiler Located in Unconfined Space
If your boiler is in an open area (unpartitioned basement) in a conventional
house, the air that leaks through the cracks around doors and windows will
usually be adequate to provide air for combustion. The doors should not fit
tightly. Do not caulk the cracks around the windows.
An unconfined space is defined as a space whose volume is not lessthan 50
cubic feet per 1,000 Btu per hour of the total inputrating of all appliances
installed in that space.
EXAMPLE 2: Boiler Located in Confined Space
A, All Air from Inside the Building: The confined space shall be provided
with two permanent openings communicating directly with an additional
room(s) of sufficient volume so that the combined volume of all spaces
meets the criteria for an unconfined space. The total input of all
combustion equipment installed in the combined space shall be
considered in making this determination. Each opening shall have a
minimum free area of one square inch per 1,000 Btu per hour of the total
input rating of all combustionequipment in the confinedspace, but not less
than 100 square inches. One opening shall be within 12 inches of the top
and one within 12 inchesof the bottom of the enclosure. See Figure 4.
Example: Your boiler is rated at 100,000 Btu per hour. The water heater
is rated at 30,000 Btu per hour. The total is 130,000 Btu per hour. You
need two grilles, each with 130 square inchesof FREE opening. Metal
grilles have about 60% FREE area. To find the Iouveredarea needed,
multiply the FREE area required by 1.7 (130 x 1.7 = 221.0 sq. in.
Iouvered area). In thisexample two grilles, each having an 8" x 30" (240
sq. in,) Iouvered area would be used. Fig. 4 shows the grille locations.
B. All Air from Outdoors: The confined space shall be provided with two
permanent openings, one commencing within 12 inches of the top and
one commencing within 12 inches of the bottom of the enclosure. The
openings shall communicate directly, or by ducts, with the outdoors or
spaces (crawl or attic)thatfreely communicatewith the outdoors.
1. When directly communicatingwith the outdoors, each opening shall have
a minimum free area of one square inchper 4,000 Btu per hour of total
input rating of all equipment in the enclosure.
2. When communicatingwith the outdoors through ve_cal ducts, each
opening shall have a minimum free area of one square inch per 4,000
Btu per hour of total input rating of all equipmentin the enclosure.
3. Whencommunicating w ith the outdoors throughhorizontal ducts,each
openingshall havea minimumfree area of one squareinch per
2,000 Btu per hour of total input ratingof all equipmentin the
enclosure.
4. Whenductsare used,they shallbe of the samecross-sectional area
as the freeareaof the openings towhichtheyconnect. T heminimum
dimension of rectangular air ductsshal{be notlessthanthreeinches.
VENTILATING
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AIR
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Fresh Air Duct Capacities for Ducts Supplying
Fresh Air to
boiler in tightly constructed
houses. British Thermal Units per
hour Input (Btuh)*.
Fresh Air
Duct Size
31/2" x 12"
8 *
x
8"
8"
x 12"
8"
x 16"
1/4"Mesh
Screen Btuh
144,000
256,000
384,000
512,0O0
Wood
Louvers Stuh
36,000
64,000
96,000
128,000
Metal
Louvers Btuh
108,000
!92,000
288,000
384,000
*Based on opening
covered by IA" mesh screen, wood louvers, or mela{ louvers
FRESH