Smith SERIES 28RTS/HE, Installation & Operating Instructions Manual

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Page 4
SERIES 28RTS/HE BOILER INSTALLATION AND OPERATION INSTRUCTIONS
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
1 in
2
/4000 Btu/hr, 35 in
2
/GPH, 550 mm
2
/kW of the total
input rating of all of the equipment in the enclosure.
Where communicating with the outdoors through
horizontal ducts, each opening shall have a minimum
free area of 1 in
2
/2000 Btu/hr, 70 in
2
/GPH, 1100 mm
2
/
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
2
)
Metal Wooden
Input 1/4", 6.4 mm Louvers Louvers
(MBH) Wire Screen 75% Free Area 25% Free Area
in
2
cm
2
in
2
cm
2
in
2
cm
2
1000 250 1613 333 2148 1000 6452
1200 300 1936 400 2578 1200 7742
1400 350 2258 467 3007 1400 9033
1600 400 2581 533 3437 1600 10,323
1800 450 2903 600 3866 1800 11,614
2000 500 3226 666 4296 2000 12,904
2200 550 3549 733 4726 2200 14,194
2400 600 3871 800 5155 2400 15,485
2600 650 4194 867 5585 2600 16,775
2800 700 4516 934 6014 2800 18,066
3000 750 4838 1000 6452 3000 19,354
3200 800 5162 1066 6874 3200 20,646
3400 850 5484 1134 7303 3400 21,937
3600 900 5807 1200 7733 3600 23,227
3800 950 6129 1267 8162 3800 24,518
4000 1000 6452 1334 8592 4000 25,808
4200 1050 6775 1400 9022 4200 27,098
4400 1100 7097 1467 9451 4400 28,389
4600 1150 7420 1533 9881 4600 29,679
4800 1200 7742 1600 10,310 4800 30,970
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
3 /GAL, 0.22 m 3 /L for oil or
25 ft 3 /100 MBH (Therm), 0.024 m 3 /kW for gas must be
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 2 /GPH, 2200 mm 2 /kW based
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 in size. 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.