Installation Requirements; Fresh Air For Combustion - Carrier BW4 Installation, Start-Up, And Operating Instructions Manual

Oil-fired cast iron hot water boilers sizes 74,000 through 239,000 series a

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Table of Contents

Refer to Fig. 3 for the basic requirements of a typical installation.

NOTE: Always keep manual fuel supply valve shut off if burner is shut down for an extended period of time.

ENTRANCE

SWITCH

2 IN. FILL PIPE

VENT PIPE

MINIMUM 2 IN. ID

OIL

TANK

SHUTOFF

VALVE

OIL

FILTER

WARNING: Be sure to provide enough fresh air for combustion. Enough air ensures proper combustion and

ASSURES THAT NO HAZARD WILL DEVELOP DUE TO LACK OF OXYGEN. Failure to follow this warning can cause a fire,

personal injury, or death.

CAUTION: Air for combustion must not be contaminated by halogen compounds, which include fluoride, chloride,

bromide, and iodide. These elements are found in aerosol sprays, detergents, bleaches, cleaning solvents, salts, air

fresheners, and other household products.

Excessive exposure to contaminated combustion air will result in safety and performance related problems.

CAUTION: If a fireplace or a kitchen or bathroom exhaust fan is used, an outside air intake should be installed. These

devices rob the boiler and water heater of combustion air.

Enough fresh air must be provided to assure proper combustion. The fire in the boiler uses oxygen. It must have a continuous supply. The air in

a house contains only enough oxygen to supply the burner for a short time. Outside air must enter the house to replace that used by the burner.

The exact fresh air requirements depend on whether the boiler is located in an unconfined or confined space.

PROCEDURE 1—BOILER LOCATED IN UNCONFINED SPACE

An unconfined space is defined as a space with volume not less than 50 cu ft per 1000 Btuh of total input rating of all appliances installed in that

space.

If boiler is in an open area (unpartitioned basement) in a conventional house, air that leaks through cracks around doors and windows will usually

be adequate to provide air for combustion. The doors should not fit tightly. Cracks around windows should not be caulked.

PROCEDURE 2—BOILER LOCATED IN CONFINED SPACE

A. All Air From Inside Building

The confined space shall be provided with 2 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 combustion equipment installed in the combined

space shall be considered in making this determination. Each opening shall have a minimum free area of 1 sq in. per 1000 Btuh of total input rating

for all combustion equipment in the confined space, but not less than 100 sq in. One opening shall be within 12 in. of the top and 1 within 12 in.

of the bottom of the enclosure. (See Fig. 4.)