Combustion Air & Ventilation - RBI Spectrum series Installation And Operation Instructions Manual

COMBUSTION AIR & VENTILATION
This boiler/water heater must be supplied with
combustion air in accordance with Section 5.3, Air
for Combustion & Ventilation, of the latest revision
of the National Fuel Gas Code, ANSI Z223.1/NFPA
54 and all applicable local building codes. Canadian
installations must comply with CSA B149.1 or .2
Installation Code for Gas Burning Appliances and
Equipment, or applicable provisions of the local
building codes. Failure to provide adequate combustion
air for this boiler/water heater can result in excessive
levels of carbon monoxide that can result in severe
personal injury or death!
To operate properly and safely this boiler/water heater requires a
continuous supply of air for combustion. NEVER store objects on
or around the boiler/water heater!
Combustion air contaminated with fluorocarbons or
other halogenated compounds such as cleaning
solvents and refrigerants will result in the formation
of acids in the combustion chamber. These acids will
cause premature failure of the boiler/water heater
voiding the warranty!
If the boiler/water heater is operated while the building
is under construction it MUST be protected from
wood, concrete, sheet rock and other types of dust.
Failure to properly protect the unit from construction
dust will damage the unit voiding the warranty!
All Air From Inside The Building
If the boiler/water heater is to be located in a confined space,
minimum clearances listed in Table 1 must be maintained between
the boiler/water heater and any combustible construction. When
installed in a confined space, Figures 1 and 2, two permanent
openings communicating with an additional room(s) are required.
The combined volume of these spaces must have sufficient volume
to meet the criteria for an unconfined space. The total air
requirements of all gas utilization equipment, fireplaces, wood stoves
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, 2200 mm
of ALL gas utilization equipment in the confined area. Each opening
must be no less than 100 in
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.
4
Finned copper tube gas boilers & water heaters – Boiler Manual
/kW based on the total input rating
2
2 , 64,516 mm 2 in size. The upper
All Air From Outside The Building
When installed in a confined 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, 550 mm
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
1100 mm 2 /kW of the total input rating of all of the equipment in the
enclosure.
When louvers and screens 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 necessary 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, ducts should be sized per Table 3.
Canadian installations must comply with CSA B149.1 when air
supply is provided by natural air flow from the outdoors for natural
draft, partial fan-assisted, fan-assisted, or power draft-assisted
burners, there shall be a permanent air supply opening(s) having
a cross-sectional area of not less than 1 in
(310 mm per kW) up to and including 1 million Btuh, plus
2
1 in 2 per 14,000 Btuh (155 mm
Btuh.
Table 3 Make-up Air Louver Sizing
Required Cross Sectional Area
Input 1/4 in 6.4 mm
(MBH) Wire Screen
in
2 cm
2
100 25 161
37
150 858
200 50 322
62
250 400
75
300 484
350 87 561
100
400 645
2 /kW of the
/2000 Btu/hr,
2
2 per 7,000 Btuh
2 per kW) in excess of 1 million
75% Free Area 25% Free Area
Metal Louvers Wooden Louvers
in in
2 cm 2 cm
2
33 213 100 645
50 150
322 967
67 432 200 1290
83 250
535 1612
100 300
645 1934
117 754 350 2257
133 400
858 2579
2