38
12.1 Ratings and Capacities
Constructed and hydrostatically tested for maximum
•
allowable working pressure of 50 psig (pounds per
square inch gauge) (345 kPa) in accordance with ASME
Boiler and Pressure Vessel Code, Section IV, Rules for
Construction of Heating Boilers.
Ratings are for sea level applications.
•
US - Boiler derates input 4% for every 1000 feet (304
•
m) above an elevation of 2000 feet (610 m) above sea
level.
Canada - Boiler certifi ed for altitudes of 0-4500 feet
•
(1350 m) above sea level. Contact Provincial authority
having jurisdiction for installations above 4500 feet
(1350 m) above sea level.
TABLE 12-1: SEA LEVEL RATINGS
NATURAL AND PROPANE GASES
Size
Boiler Input Rate (MBH)
(1)
Heating Capacity
(MBH)
(1)(2)
Net I=B=R Rating,
Water (MBH)
(1)(3)
AFUE
(2)
Maximum
Minimum
075
75
15
69
60
97.0
100
100
20
91
79
97.0
(1)
1000
Btu/hr (British Thermal Units Per Hour)
(2)
Heating Capacity and AFUE (Annual Fuel Utilization Effi ciency) are based on DOE (Department of Energy) test
procedures.
(3)
Net I=B=R Ratings based on piping and pickup allowance of 1.15. Contact ECR Technical Support before selecting boiler for
installations having unusual piping and pickup requirements, such as intermittent system operation, extensive piping systems,
etc.
12 - RATINGS AND CAPACITIES
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