National Products BW3 - Manual (Page 3)

INTRODUCTION
This boiler cannot be used with all types of chimneys. Read these instructions carefully before installing.
These Gas-Fired Hot Water Boilers are low-pressure, sectional cast iron boilers design certified by the American Gas Association (A.G.A.) and
Canadian Gas Association (C.G.A.) for use with natural and propane gases. They are constructed and hydrostatically tested for a maximum
working pressure of 50 psi in accordance with the American Society of Mechanical Engineers (A.S.M.E.) Boiler and Pressure Vessel Code Section
IV Standards for cast iron heating boilers.
Check to be sure boiler size is correct before starting installation. See rating and capacity table shown in Fig. 1. Also be sure new boiler is for
the type of gas being used. Check rating plate on right side of boiler.
The boiler must be supplied with correct type of gas, fresh air for combustion, and a suitable electrical supply. Boiler must also be connected to
a suitable venting system and an adequate piping system. Finally, a properly located thermostat is needed for control of heating system. If there
are any doubts as to the various requirements, check with local authorities and obtain professional help where needed. Take time to complete all
the steps for SAFE and PROPER operation of heating system.
If this boiler is installed in a building under construction, special care must be taken to insure a clean combustion air supply during the construction
process. Airborne particulates such as from drywall dust and from fiberglass insulation can clog the burner ports and cause incomplete combustion
and sooting.
Where required by authority having jurisdiction, the installation must conform to American Society of Mechanical Engineers Safety Code for
Controls and Safety Devices for Automatically Fired Boilers, No. CSD-1.
Before installing the boiler in the United States, refer to the current edition of the NFGC and the NFPA 90B. For copies of the NFGC and NFPA
90B, contact the National Fire Protection Association Inc., Batterymarch Park, Quincy, MA 02269; or for only the NFGC contact the American
Gas Association, 400 N. Capitol St., N.W., Washington DC 20001.
Before installing the boiler in Canada, refer to the NSCNGPIC. For a copy of the NSCNGPIC, contact Standard Sales, CSA International, 178
Rexdale Boulevard, Etobicoke (Toronto), Ontario, M9W 1R3, Canada.
Installation must comply with regulations of serving gas supplier and local building, heating, plumbing or other codes in effect in the area in which
installation is made. In absence of local building codes, installation must comply with NFGC in the United States and the NSCNGPIC in Canada.
The following steps are all necessary for proper installation and safe operation of boiler.
1. LOCATING THE BOILER
2. FRESH AIR FOR COMBUSTION
3. INSTALLATION—SYSTEM PIPING
4. CHIMNEY AND VENT PIPE CONNECTION
5. GAS SUPPLY PIPING
6. ELECTRICAL WIRING
7. CHECKING AND ADJUSTING
WARNING: Keep boiler area clean and free from combustible materials, gasoline, and other flammable vapors and
liquids. Failure to follow this warning could result in explosion, electrical shock, fire, personal injury, or death.
WARNING: Improper installation, adjustment, alteration, service, maintenance, or use can cause carbon monoxide
poisoning, explosion, fire, electrical shock, or other conditions which may cause personal injury or property damage.
Consult a qualified installer, service agency, local gas supplier, or your distributor or branch for information or assistance.
The qualified installer or agency must use only factory-authorized and listed kits or accessories when modifying this
product. Boilers with cast iron burners are not to be converted to propane. Failure to follow this warning could result in
electrical shock, fire, personal injury, or death.
NOTE: Installers—Follow local regulations with respect to installation of CO detectors. Follow maintenance recommendations in this instruction
manual.
N.B. Techniciens—Veuillez vous conformer à la réglementation en vigueur concernant l’ installation des détecteurs d’oxyde de carbone. Suivre
les consignes d’entretien figurant dans le manuel d’instruction ci-joint.
BOILER RATINGS AND CAPACITIES
The ratings marked "Net I=B=R Rating" indicate the amount of remaining heat input that can be used to heat the radiation or terminal units. 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 484-84-E-Vol. III.
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 non-combustible 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 or the manufacturer for correct orifice sizing information. High-altitude orifices are available from boiler manufacturer.
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