Operating instructions
14. Purging the heating system of air and gases when first putting the boiler into service is critical for proper circulation and quiet performance.
Once the air and gases are purged, for boiler installations using float type vents, the air vents should be closed for normal operation. If air
is heard or noticed by loss of heat, purge the system and open the vents for a short period of time.
WARNING: Use only number 1 or number 2 fuel oil having commercial standard grade CS 12-48. Do not use gasoline,
kerosene, crankcase oil, or any oil containing gasoline. A failure to adhere to this warning can cause a fire, explosion,
physical injury, or death.
WARNING: This boiler has been designed for residential installations. If used for commercial applications, all
jurisdictional requirements must be met. This may require wiring and/or piping modifications. The manufacturer is not
responsible for any changes to original design.
WARNING: DO NOT USE GASOLINE CRANKCASE DRAININGS OR ANY OIL CONTAINING GASOLINE.
INTRODUCTION
Check to be sure boiler size is correct before starting installation. See rating and capacity table shown in Fig. 2 and Table 1a and 1b. Check rating
plate on right side of boiler.
The boiler must be supplied with the proper oil, 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. The Operating Boiler Instructions and Final
Checks and Adjustments sections later in this document are vital to the proper and safe operation of the heating system. Take time to be sure they
are all done.
The following steps are all necessary for proper installation and safe operation of boiler:
1. LOCATING THE BOILER
2. OIL SUPPLY AND PIPING
3. FRESH AIR FOR COMBUSTION
4. PIPING CONNECTIONS
5. CHIMNEY AND VENT PIPE CONNECTIONS
6. ELECTRICAL WIRING
7. THERMOSTAT LOCATION
8. CHECKING AND ADJUSTING
9. MAINTENANCE
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, fuel oil 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.
Failure to follow this warning could result in electrical shock, fire, personal injury, or death.
PROCEDURE 1—EXPLANATION OF MODEL NUMBERS AND RATING PLATE
Each model number has 3 possible firing rates depending on which nozzle is installed. The model number represents the largest possible input for
the unit. For example, a BW4BAH000140ABAA has a maximum input of 140,000 Btuh. The rating plate for each model shows the three possible
firing rates. Boilers come shipped with the largest nozzle installed. By changing nozzles, the BW4BAH000140ABAA firing rate can be changed
to 91,000 or 105,000 Btuh input.
The BW4(5)BAH000280ABAA is shipped with 2 additional nozzles to fire the boiler at the alternate inputs listed on the rating plate. The
BW4(5)BAH000210ABAA and BW4(5)BAH000140ABAA are shipped with one additional nozzle each, to fire the boilers at the next lowest
inputs listed on the rating plate. To fire the BW4(5)BAH000210ABAA and BW4(5)BAH000140ABAA at the lowest inputs listed on the rating
plate, an accessory low-fire kit for each boiler, not included with the boiler, is required. The low-fire kits include the alternate size nozzle and
alternate burner end cone to fire these boilers at the lowest inputs for those models. Refer to Tables 1a, 1b, and Table 7 for additional oil burner
information. Refer to the boiler product data sheet for the correct low-fire kit.
PROCEDURE 2—GENERAL INFORMATION
Boilers with the same number of sections are identical to each other except for their firing rate. The firing rate is determined by the nozzle size
in the oil burner and the oil pressure at the nozzle. For example, models BW4BAH091, BW4BAH105, and BW4BAH140 are the same boiler,
without a tankless coil, except for the firing rate of the oil burner. Models BW5BAH126, BW5BAH175 and BW4BAH210 are the same boiler,
with a tankless coil, except for the firing rate of the oil burner.
LOCATION
PROCEDURE 1—BEFORE YOU START
Complete all of the following prior to installing the boiler:
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