4
New York City MEA Number 484-84 E Vol. IV.
The Ratings marked “Net I=B=R Ratings” indicate the
amount of remaining heat input that can be used to heat
the radiation units. The net I=B=R Ratings shown are
based on an allowance of 1.15 in accordance with the
factors shown on the I=B=R Standard as published by
the Hydronics Institute. Selection of boiler size should
be based upon “Net I=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.
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 sea
level, the input ratings are reduced by a change in main
orifi ce size.
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 latest edition of the
National Fuel Gas Code (NFPA54/ANSI Z223.1) for correct
orifi ce sizing information. High altitude orifi ces are available
from the boiler manufacturer.
Number of Boiler
Sections
Natural or Propane Gas
Dimensions
Input *MBH
Heating Capacity
*MBH+
Net I=B=R
Rating *MBH
Flue
Diameter
Dim. A
3
70
57
50
5"
11-1/4"
4
105
85
74
6"
14-1/2"
5
140
113
98
6"
17-3/4"
6
175
142
123
7"
21"
7
210
170
148
7"
24-1/4"
8
245
198
172
7"
27-1/2"
9
280
226
197
7"
30-3/4"
* MBH = 1,000 BTUH = British Thermal Unit Per Hour. Boilers are equipped for altitudes up to 2,000 feet only.
For altitudes above 2,000 feet, ratings should be reduced at the rate of 4% for each 1,000 feet above sea level.
+ Heating Capacity based on D.O.E. (Department of Energy) test procedure.
BOILER RATINGS AND CAPACITIES
Table 1- Boiler Ratings and Capacities
