National Products Series B, BW3 Procedure 2ÐBOILER Located in Confined Space, Ð6Ð

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Equipment located in buildings of unusually tight construction shall be provided with air for combustion, ventilation, and dilution of flue gases using the methods described in example 2B or shall be specially engineered. The authority having jurisdiction must approve specially engineered installations.

PROCEDURE 2ÐBOILER LOCATED IN CONFINED SPACE

EXAMPLE 2A: ALL AIR FROM INSIDE THE BUILDING

The confined space shall be provided with two permanent openings communicating directly with an additional room(s) of sufficient volume so that the combined volume of all spaces meets the criteria for an unconfined space. The total input of all gas utilization equipment installed in the combined space shall be considered in making this determination. Each opening shall have a minimum free area of one square inch per 1,000 Btu per hour of the total input rating of all gas utilization equipment in the confined space, but not less than 100 square inches. One opening shall be within 12 inches of the top and one within 12 inches of the bottom of the enclosure. The minimum dimension of air openings shall not be less than 3 inches.

EXAMPLE 2B: ALL AIR FROM OUTDOORS

The confined space shall communicate with the outdoors in accordance with examples 1 or 2. The minimum dimension of air openings shall not be less than 3 in. Where ducts are used, they shall be of the same cross-sectional area as the free area of the openings to which they connect.

1.Two permanent openings, one commencing within 12 inches of the top, and one commencing within 12 inches of the bottom of the enclosure shall be provided. The openings shall communicate directly, or by the ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors

a.Where directly communicating with the outdoors or where communicating to the outdoors through vertical ducts, each opening shall have a minimum free area of 1 sq. in. per 4000 Btu per hour of total input rating of all equipment in the enclosure. (See Table 3A.)

b.Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 sq. in. per 2000 Btu per hour of total input rating of all equipment in the enclosure. (See Table 3B.)

2.One permanent opening commencing with 12 inches of the top of the enclosure shall be permitted where the equipment has clearance of at least 1 inch from the sides and back and 6 inches from the front of the appliance. The opening shall directly communicate with the outdoors or shall communicate through a vertical or horizontal duct to the outdoors or spaces (crawl or attic) that freely communicate with the outdoors and shall have a minimum free area of:

a.1 sq. inch per 3000 Btu per hour of the total input of all equipment located in the enclosure (see Table 3C), and

b.Not less than the sum of the areas of all vent connectors in the confined space.

Table 3AÐFresh Air Duct Capacities for Vertical Ducts (Btuh)*

 

100% FREE AREA

75% FREE AREA

25% FREE AREA

Fresh Air

1/4-in. Mesh

Metal

Wood

Duct Size (In.)

Screen

Louvers

Louvers

3" X 12"

144,000

108,000

36,000

 

 

 

 

8" X 8"

256,000

192,000

64,000

 

 

 

 

8" X 12"

384,000

288,000

96,000

8-1/2" X 16"

512,000

384,000

128,000

 

 

 

 

* 1 Square Inch per 4,000 Btuh

Table 3BÐFresh Air Duct Capacities for Horizontal Ducts (Btuh)*

 

100% FREE AREA

75% FREE AREA

25% FREE AREA

Fresh Air

1/4-in. Mesh

Metal

Wood

Duct Size (In.)

Screen

Louvers

Louvers

 

 

 

 

3" X 12"

72,000

54,000

18,000

 

 

 

 

8" X 8"

128,000

96,000

32,000

8" X 12"

192,000

144,000

48,000

 

 

 

 

8-1/2" X 16"

256,000

192,000

64,000

 

 

 

 

* 1 Square Inch per 2,000 Btuh

Table 3CÐFresh Air Duct Capacities for Vertical or Horizontal Ducts (Btuh)*

 

100% FREE AREA

75% FREE AREA

25% FREE AREA

Fresh Air

1/4-in. Mesh

Metal

Wood

Duct Size (In.)

Screen

Louvers

Louvers

3" X 12"

108,000

81,000

27,000

8" X 8"

192,000

144,000

48,000

 

 

 

 

8" X 12"

288,000

216,000

72,000

 

 

 

 

8-1/2" X 16"

384,000

288,000

96,000

 

 

 

 

* 1 Square Inch per 3,000 Btuh

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Contents Installation, Start-Up, and Operating Instructions IndexSafety Considerations Ð2ÐPage Gas-Fired Hot Water Boilers → Locating the BoilerÐ4Ð →FRESH AIR for Combustion Procedure 1ÐBOILER Located in Unconfined Space→ ÐRoom Large In Comparison With Boiler Ð5ÐBÐFresh Air Duct Capacities for Horizontal Ducts Btuh Procedure 2ÐBOILER Located in Confined SpaceAÐFresh Air Duct Capacities for Vertical Ducts Btuh Ð6ÐProcedure 2ÐLOW Design Water Temperature Systems below 140F Installationðsystem PipingProcedure 1ÐFOR USE with Cooling Units Procedure 1ÐCHECKING ChimneyProcedure 2ÐMINIMUM Vent Pipe Clearance Ð8ÐPower Venter KIT ÐBoiler and Power VenterOptional Horizontal Venting with Power Venter Ð9ÐÐGas Pipe Sizes GAS Supply Piping Procedure 1ÐCHECKING GAS SupplyProcedure 2ÐCONNECTING GAS Piping Ð10ÐProcedure 1ÐELECTRIC Power Supply Procedure 3ÐCHECKING GAS PipingElectrical Wiring Procedure 2ÐINSTALLING ThermostatÐUnit Wiring Diagram Ð12ÐEquipment and Optional Accessories Procedure 1ÐRELIEF Valve Procedure 7ÐDRAIN ValveProcedure 8ÐWATER Temperature Control Procedure 11ÐPRESSURE Switch Procedure 9ÐCIRCULATING PumpProcedure 10ÐBLOWER Draft Inducer Procedure 12ÐROLLOUT Switch Flame Rollout Safety ShutoffTo Turn Off Gas To Appliance GAS Valve Operating InstructionsTo Turn On Gas To Appliance Ð15ÐProcedure 4ÐLIMIT Controls Adjustment Procedure 2ÐPILOT Burner AdjustmentProcedure 3ÐMAIN Burners Procedure 5ÐTHERMOSTAT Heat Anticipator AdjustmentProcedure 3ÐEXPANSION Tank Maintaining Boiler Procedure 1ÐBURNERSProcedure 2ÐRELIEF Valve Procedure 4ÐBOILER Flue PassagesÐ18Ð Procedure 8ÐBLOWERService Hints If System is not Heating or not Giving Enough HeatÐ19Ð → for USE with Natural GAS onlyNatural Gas Burners and Manifold Parts KEY Description→ for USE with Propane GAS only Propane Gas Burners and Manifold PartsÐ20Ð Ð21Ð KEYBoiler Controls and Piping Ð22ÐService Training Ð23ÐÐ24Ð

BW3, Series B specifications

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