1
Boiler Ratings and Capacities
DESIGN CERTIFIED FOR
NATURAL AND PROPANE GAS
FIG. 1
*MBH = 1,000 Btuh = British Thermal Unit Per Hour
Boilers are equipped for altitudes up to 2,000 feet only.
U.S.A. Only - For altitudes above 2,000 feet, ratings should be reduced at the rat of 4% for each 1,000 feet above sea level.
Canada Only - Boilers may be used at high altitude by using a certified field conversion, kit, resulting in a 10% derate.
+ Heating Capacity based on D.O.E. (Department of Energy ) test procedure.
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New York City MEA Number 484-84-E Vol. IV.
The Ratings marked Net 1=B=R Ratings indicate
the amount of remaining heat input that can be
used to heat the radiation or terminal units. The
Net 1=B=R Ratings shown are based on an
allowance of 1.15 in accordance with the factors
shown on the 1=B=R Standard as published by
The Hydronics Institute.
Selection of boiler size should be based upon
Net 1=B=R Rating being equal to or greater
than the calculated heat loss of the building.
The manufacturer should be consulted before
selecting a boiler for installations having unusual
piping and pickup requirements.
These boilers must stand on a noncombustible
floor. If installed on a combustible floor, use
Combustible Floor Base.
These Gas-Fired Hot Water Boilers are low
pressure, sectional cast iron boilers Design
Certified by CSA (Canadian Standards
Association) for use with Natural and Propane
Gases. They are constructed and hydrostatically
tested for a maximum working pressure of 50psi
(pounds per square inch) in accordance with
A.S.M.E. (American Society of Mechanical
Engineers) Boiler and Pressure Vessel Code
Section IV Standards for cast iron heating boilers.
BOILERS FOR USE AT HIGH ALTITUDE
This boiler is factory equipped for use at altitudes
of 0-2,000 feet above sea level. For use at altitudes
above 2,000 feet above sea level, the input ratings
are reduced by a change in main burner orifice size.
U.S.A. Only - For altitudes above 2,000 feet above
sea level, input ratings should be reduced at the
rate of 4% for each 1,000 feet above sea level.
Consult the National Fuel Gas Code (NFPA54/ANSI
Z223.1-latest edition), or the manufacturer for
correct orifice sizing information. High altitude
orifices are available from the boiler manufacturer.
Canada Only - For altitudes in the range of 2,000-
4,500 feet above sea level, boilers may be field
equipped for use at high altitude by using a certified
field conversion kit. The change in main burner orifice
size results in the boilers input rating being reduced
by 10%.The conversion shall be carried out by a
manufacturers authorized representative, in
accordance with the requirements of the manufacturer,
provincial or territorial authorities having jurisdiction
and in accordance with the requirements of the CSA-
B149.1 and CSA-8149.2 Installation Codes.The
certified field conversion kit includes a conversion data
plate, which must be attached to the boiler adjacent to
the rating plate, indicating that the boiler has been
converted for high altitude use. The conversion
data plate must be filled in with the correct
conversion information.
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