Combustion Air & Ventilation - Smith SERIES 28RTS/HE Installation & Operating Instructions Manual

SERIES 28RTS/HE BOILER INSTALLATION AND OPERATION INSTRUCTIONS
Page 4
COMBUSTION AIR & VENTILATION
WARNING: This boiler must be supplied with
combustion and ventilation air in accordance
with the latest revision of Section 5.3, Air for
Combustion & Ventilation, of the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 for gas boilers
or ANSI/NFPA 31 Installation of Oil Burning
Equipment for oil boilers. Canadian installations
must comply with CAN/CSA B149.1 Natural Gas
and Propane Installation Code for gas boilers
or CSA B140.7 Oil Burning Equipment for oil
boilers. All applicable local building codes
must be adhered to. Failure to provide adequate
combustion air for this boiler can result in
excessive levels of carbon monoxide which can
result in severe personal injury or death!
To operate properly and safely this boiler requires a
continuous supply of air for combustion. An adequate
supply of air must be available to replace the air used
by the combustion process. NEVER store objects on or
around the boiler.
CAUTION: Never use an exhaust fan in the boiler
room. The boiler room must never be under a
negative pressure or improper burner operation will
occur!
NOTE: Forced make-up air supplied to the boiler
room must be approved by the local authorities.
A minimum of 30 ft
25 ft 3 /100 MBH (Therm), 0.024 m
provided.
All Air From Inside The Buidling
If the boiler is to be located in a confi ned space mini-
mum clearances of 24 in., 610 mm must be maintained
between the boiler and any adjacent construction.
When installed in a confi ned space, two permanent
openings communicating with an additional room(s)
are required. The combined volume of these spaces
must have suffi cient volume to meet the criteria for an
unconfi ned space. The total air requirements of all fuel
burning equipment or any type of exhaust fan must be
considered when making this determination.
Each opening must have a minimum free area of
1 in 2 /1000 Btu/hr, 140 in
on the total input rating of ALL fuel burning equipment
in the confi ned area. Each opening must be no less than
100 in 2 , 64,516 mm 2
within 12 in., 305 mm of, but not less than 3 in., 76 mm
from, the top of the enclosure.
3 3
/GAL, 0.22 m /L for oil or
3 /kW for gas must be
2 /GPH, 2200 mm 2 /kW based
in size. The upper opening must be
The bottom opening must be within 12 in., 305 mm
of, but not less than 3 in., 76 mm from, the bottom of the
enclosure.
All Air From Outside The Building
When installed in a confi ned space two permanent
openings communicating directly with, or by ducts to,
the outdoors or spaces that freely communicate with
the outdoors must be present. The upper opening must
be within 12 in., 305 mm of, but not less than 3 in.,
76 mm from, the top of the enclosure. The bottom
opening must be within 12 in., 305 mm of, but not less
than 3 in., 76 mm from, the bottom of the enclosure.
Where directly communicating with the outdoors or
communicating with the outdoors through vertical ducts,
each opening shall have a minimum free area of
2
1 in /4000 Btu/hr, 35 in
input rating of all of the equipment in the enclosure.
Where communicating with the outdoors through
horizontal ducts, each opening shall have a minimum
2
free area of 1 in /2000 Btu/hr, 70 in
kW of the total input rating of all of the equipment in the
enclosure. When ducts are used, they must have the
same cross-sectional area as the free area of the
opening to which they connect. When calculating the
free area necessar y to meet the make-up air
requirements of the enclosure, consideration must be
given to the blockage effects of louvers, grills and
screens. Screens must have a minimum mesh size of
1/4 in, 6.4mm. If the free area through a louver or grill
is not known the louver or grille should be sized per
Table 1.
Table 1 - Make-up Air Louver Sizing
Required Cross Sectional Louver Area (in
Input 1/4", 6.4 mm
(MBH) Wire Screen
in 2 cm 2
1000 250 1613
1200 300 1936
1400 350 2258
1600 400 2581
1800 450 2903
2000 500 3226
2200 550 3549
2400 600 3871
2600 650 4194
2800 700 4516
3000 750 4838
3200 800 5162
3400 850 5484
3600 900 5807
3800 950 6129
4000 1000 6452
4200 1050 6775
4400 1100 7097
4600 1150 7420
4800 1200 7742
2 2
/GPH, 550 mm /kW of the total
2
/GPH, 1100 mm
Metal Wooden
Louvers Louvers
75% Free Area 25% Free Area
in 2 cm 2 in 2
333 2148 1000
400 2578 1200
467 3007 1400
533 3437 1600
600 3866 1800
666 4296 2000
733 4726 2200
800 5155 2400
867 5585 2600
934 6014 2800
1000 6452 3000
1066 6874 3200
1134 7303 3400
1200 7733 3600
1267 8162 3800
1334 8592 4000
1400 9022 4200
1467 9451 4400
1533 9881 4600
1600 10,310 4800
2
/
2
)
cm 2
6452
7742
9033
10,323
11,614
12,904
14,194
15,485
16,775
18,066
19,354
20,646
21,937
23,227
24,518
25,808
27,098
28,389
29,679
30,970