Bryant BS2, BW4B, BS1, BW1, BW5B, BW2, BW9 manual Model BW3, GAS Controls Intermittent Pilot

Page 11

MODEL BW3

Model BW3 Gas-Fired Induced-Combustion Water Boilers are the answer to energy-efficient residential hydronic heating. They provide fast, almost instant, heat quietly and economically.

These boilers provide quality design in a small, compact unit easily installed in a basement, garage, or utility room. They can be installed on a combustible floor when an optional combustible floor kit is used.

The design of model BW3N is CSA and A.G.A. certified for use with natural gas and is convertible to propane gas with accessory kit.

FEATURES

RANGE OF CAPACITIES—Six sizes ranging from 42,500 through 225,000 Btuh input.

COMPLETELY PACKAGED—Each boiler is completely assembled, including all controls (except room thermostat). All necessary wiring is factory installed. The boiler is ready for gas, water, room thermostat, and electrical power connections as shipped.

VENTING—This boiler can be vented into any approved chimney or Type B-1 vent. Common-venting with an existing water heater is acceptable in vertical vent systems. See the Installation Instructions for common venting requirements. The induced-combustion design also eliminates the need for a vent damper.

THERMAL-PIN CAST-IRON SECTIONS—These sections speed heat transfer from the flue gases to the boiler water, with faster ther- mostat response, providing greater comfort and economy.

TITANIUM COMPOSITE BURNERS—Provide quiet operation, corrosion resistance, and improved combustion efficiency. Propane convertible with accessory kit.

CONTROLS—An automatic gas valve and intermittent pilot provide quiet, dependable operation of the burners. Factory-installed safety components provide maximum safety against overheating, pressure buildup, and low-water operation.

INSULATED CASING—Fully insulated with fiberglass for maximum operating efficiency and economy.

SECTIONS TESTEDEach section is hydrostatically tested to 50 psig. Individual sections are tested to 125 psig at factory. Assembled sections are tested to 75 psig at the factory. The maximum allowable pressure is 50 psig for hot water boilers.

UNIT CONVERTIBLE—The Boiler is listed for power venting with field controls power venting kit.

WARRANTY—The cast-iron sections are covered by a non-prorated 20-year warranty on the entire assembly. Circulator pump covered by 3-year warranty. All other parts are covered by a 1-year limited warranty.

SPECIFICATIONS

UNIT SIZE

 

 

 

042

 

075

 

112

 

 

150

 

187

 

225

Sections—Fine Grain Cast-Iron

 

No.

 

2

 

3

 

4

 

 

5

 

6

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GAS CONTROLS — INTERMITTENT PILOT

 

 

 

 

 

 

 

 

 

 

 

 

 

Gas Valve

 

 

 

 

 

 

 

 

Honeywell

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Inlet Size

 

In.

 

 

 

 

 

 

1/2 FPT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pilot Assembly

 

 

 

 

 

 

 

 

Honeywell

 

 

 

 

Spark Generator

 

 

 

 

 

 

 

 

Honeywell

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Burners—Stainless/Titanium Alloy

 

No.

 

1

 

2

 

3

 

 

4

 

5

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Burner Orifice—Drill Size

Natural

 

32

 

34

 

34

 

 

34

 

34

 

34

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTROLS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Limit Control Range

 

°F

 

 

 

 

 

 

180–240

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pressure/Temperature Gage

 

Psig

 

 

 

 

 

 

0–60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

°F

 

 

 

 

 

 

60–260

 

 

 

 

Pressure Relief Valve Setting

 

Psig

 

 

 

 

 

 

30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Circulator Relay—Aquastat

 

 

 

 

 

 

 

Honeywell (Factory Installed)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CIRCULATOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Taco

Model

 

 

 

 

 

 

007

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Full Load Amps

 

 

 

 

 

 

 

 

0.70

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Flange Size FPT

 

In.

 

 

 

 

 

 

1-1/4

 

 

 

 

—11—

Image 11
Contents Model BW4B, BW5B Model BW9 Model BW1, BW2 Model BW3Model BS1, BS2 Description Boiler AccessoriesModel Number Nomenclature BW9AAN000075AAAABW4/BW5 ALL Models Circulator CurveStandard Boiler Warranties Yrs Water Boiler Circulator CurveModels BW9 SpecificationsUnit Type Btuh Capacity Btuh Afue % DimensionsClearances Ratings and CapacitiesGeneral Data Models BS1 and BS2Unit Size Vent Diameter Models BS1 and BS2Models BW1 and BW2 Sections Unit Size Vent ConnectionShip GAS Controls Intermittent Pilot Model BW3Unit Type Btuh BW3 ModelsModels BW4 and BW5 Ratings and Performance