Bryan Boilers Forced Draft Steam Boilers User Manual download pdf (Page 6)

1.6 ELECTRICAL CONNECTION

IMPORTANT: All electrical connections must

conform to the National Electrical Code and to all

other applicable State and Local Codes. Forced

draft boilers may require a high voltage

connection. See boiler wiring diagram and

equipment list for

details.

Equipment Grounding

- The boiler must be

grounded in accordance with the American

National Standard Electrical Code, ANSI/NFPA

#70-1981.

1.7 COMBUSTION AIR SUPPLY

IMPORTANT: Positive means for supplying an

ample amount of outside air, allowing complete

combustion of the gas, must be provided.

Movable combustion air dampers, automatic or

manually adjustable, must be electrically

interlocked with the boiler to prevent boiler

operation if the dampers are closed.

Combustion air openings must never be blocked

or obstructed in any manner.

The boiler room must be at a positive or neutral

pressure relative to the outdoors. A negative in

the boiler room will result in downdraft problems

and incomplete combustion due to lack of air.

WARNING!

Failure to provide an adequate air supply will

result in boiler damage and hazardous conditions

in the building (fire and asphyxiation hazard as

well as equipment damage).

COMBUSTION AIR:

Complete combustion of

natural or propane gas requires approximately

ten cubic foot of air (at sea level and 70F) for

each 1000 Btu of boiler input. In reality, additional

air is required to achieve complete combustion.

Air is also required for the proper operation of the

appliance draft diverter or barometric damper.

The combustion air opening recommendations

below are designed to provide the air needed for

atmospheric gas fired boilers which are equipped

with either draft diverters or barometric dampers.

Combustion air openings for boilers which are

equipped with forced draft burners may be

reduced to 70% of that required for atmospheric

gas fired boilers. This is because the forced draft

boiler is not equipped with a draft control device

(so no air is required for draft control).

COMBUSTION AIR OPENINGS - AREA

REQUIRED:

Openings directly through outside wall

One opening within 12 inches of the ceiling plus

one opening within 12 inches of the floor. Each

opening must have a minimum free area of 1

square inch per 4,000 Btu of total input of all air

using appliances in the room.

Example: A boiler room having two boilers with

500,000 Btu input would require two openings

through an outside wall, and each opening must

have at least 250 square inches of free area.

Openings through vertical ducts

One duct in the ceiling plus one duct terminating

within 12 inches of the floor. Each opening must

have a minimum free area of 1 square inch per

4,000 Btu of total input of all air-using appliances

in the room.

Example: A boiler room having four boilers with

250,000 Btu input would require two ducts, one in

the ceiling and one terminating near the floor,

each opening having at least 250 square inches

of free area.

Openings through horizontal ducts

One duct opening within 12 inches of the ceiling

plus one duct opening within 12 inches of the

floor. Each opening must have a minimum free

area of 1 square inch of per 2,000 Btu of total

input for all equipment in the room. NOTE: No

rectangular duct may have a dimension of less

than 4 inches.

Example: A boiler room having 1 million Btu total

input would require two ducts, one in the ceiling

and one near the floor, each opening must having

at least 500 square inches of free area.

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Bryan Boilers Forced Draft Steam Boilers User Manual Page 6

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