Crown Boiler FWZ Series, Installation Instructions Manual

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VI Air for Combustion and Ventilation
Sufficient fresh air must be supplied for combustion and ventilation. Provisions for combustion and ventilation air for oil
burning equipment must be made in accordance with the Standard for the Installation of Oil Burning Equipment (ANSI/NFPA
31).
To ensure an adequate supply of air for combustion, ventilation and flue gas dilution, start by determining whether adequate
combustion and ventilation air can be obtained through natural infiltration (air leaking into the building through cracks around
windows, doors, etc). Examples of construction features which could prevent adequate natural infiltration include:
• Walls and ceilings exposed to outside atmosphere having a continuous water vapor retarder with a rating of 1 perm or
less with openings gasketed and sealed
• Weather stripping added on openable windows and doors
• Caulking and sealants are applied to areas such as joints around window and door frames, between sole plates and floors,
between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas lines, and at other
openings.
• Large exhaust fans
In this manual, buildings where natural infiltration will not provide adequate air for combustion, and ventilation are referred to
as “buildings of unusually tight constuction”. If in doubt, assume that the building in which the boiler is installed is of unusually
tight construction.
1) Do not install this boiler directly on a combustible floor. Where it is desired to install an FWZ on a non-carpeted combustible
floor, install the boiler on a base constructed as shown in Figure 5.1
2) If listed Type L vent is used, follow vent pipe manufacturer recommendations for minimum clearances.
3) Do not install this boiler in a location where gasoline or other flammable vapors or liquids will be stored or used. Do not
install this boiler in an area where large amounts of airborne dust will be present, such as a workshop.
FIGURE 5.1: INSTALLATION OVER A COMBUSTIBLE FLOOR