Operating instructions
BOILER RATINGS AND CAPACITIES
The ratings marked "Net I=B=R Rating" indicate the amount of equivalent direct radiation each boiler will take care of under normal conditions
and thermostatic control. The Net I=B=R Ratings shown are based on an allowance of 1.15 in accordance with the factors in the I=B=R Standard
as published by The Hydronics Institute. New York City MEA Number 39-86E.
Selection of boiler size should be based upon "Net I=B=R Rating" being equal to or greater than calculated heat loss of building.
Consult manufacturer 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, a factory-approved combustible floor base must be used.
BOILERS FOR USE AT HIGH ALTITUDE
This boiler is factory equipped for use at altitudes of 0-2000 ft above sea level. For use at altitudes above 2000 ft above sea level, input ratings
are reduced by a change in main burner orifice size.
U.S.A. Only—For altitudes above 2000 ft above sea level, input ratings should be reduced at the rate of 4 percent for each 1000 ft above sea level.
Consult the NFGC NFPA54/ANSI Z223.1-2002 or the manufacturer for correct orifice sizing information. High-altitude orifices are available from
boiler manufacturer.
Canada Only—For altitudes in the range of 2000-4500 ft 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 boiler’s input rating being reduced by 10 percent. The conversion shall be
carried out by a manufacturer’s authorized representative in accordance with the requirements of manufacturer, provincial or territorial authorities
having jurisdiction, and in accordance with the requirements of the CAN/CGA-B149.1 and CAN/CGA-B149.2 Installation Codes. The certified
field conversion kit includes a conversion data plate which must be attached to boiler adjacent to rating plate indicating that boiler has been
converted for high-altitude use. The conversion data plate must be filled in with the correct conversion information.
→Fig. 1—Dimensional Drawing and Boiler Ratings and Capacities
Gas-Fired Hot Water Boilers
BOILER MODEL NUMBER
NO. OF
SECTIONS
NATURAL AND PROPANE GAS* DIMENSIONS (IN.)
Electronic
Ignition
with Vent Damper
Continuous
Pilot
with Vent Damper
A.G.A.
Input
MBH
Heating
Capacity
MBH
Net
I=B=R
Rating
MBH
Flue
Diameter
Width
A
BW1AAN000037ABAA BW2AAN000037ABAA 2 37.5 30 26 4† 8
BW1AAN000070ABAA BW2AAN000070ABAA 3 70 57 50 5 11-1/4
BW1AAN000105ABAA BW2AAN000105ABAA 4 105 85 74 6 14-1/2
BW1AAN000140ABAA BW2AAN000140ABAA 5 140 113 98 6 17-3/4
BW1AAN000175ABAA BW2AAN000175ABAA 6 175 142 123 7 21
BW1AAN000210ABAA BW2AAN000210ABAA 7 210 170 148 7 24-1/4
BW1AAN000245ABAA BW2AAN000245ABAA 8 245 198 172 7 27-1/2
BW1AAN000280ABAA BW2AAN000280ABAA 9 280 226 197 7 30-3/4
* Boilers are equipped for altitudes up to 2000 ft only.
U.S.A Only—For altitudes above 2000 ft, ratings should be reduced at the rate of 4 percent for each 1000 ft above sea level.
Canada Only—Boilers may be used at high altitude by using a certified field conversion kit, resulting in a 10 percent derate.
Heating Capacity is based on Department of Energy (DOE) test procedure.
† The 2-section boilers are equipped with a 3-in. diameter flue collar on draft diverter and use a factory-supplied 3-in. X 4-in. increaser fitting to install factory-supplied 4-in.
vent damper.
MBH—1000 Btuh (British Thermal Unit Per Hr) NOTE: Add 5-1/2 in. to height for vent damper.
A02318
23
1
⁄
4
†
31
3
⁄
8
†
5
3
⁄
8
†
4
3
⁄
4
†
1
1
⁄
4
† SUPPLY
26
1
⁄
2
†
12
1
⁄
4
†
A
9†
TEMPERATURE/
PRESSURE GAGE
SPILL
SWITCH
DRAIN VALVE
INT. PILOT
CONTROL
ROLLOUT
SWITCH
GAS
VALVE
1
1
⁄
4
†
RETURN
1
1
⁄
4
† NPT
AQUASTAT
VENT
DAMPER
ASME
RELIEF
VALVE
LEFT SIDE RIGHT SIDEFRONT
—4—