Installation & Operation Manual
1 Determine boiler location
Provide air openings to room:
The Crest alone in boiler room
1.No air ventilation openings into the boiler room are needed when clearances around the Crest are at least equal to the SERVICE clearances shown in FIG.
2.Combustion air openings are required when using the Room Air Option on page 23 of this manual.
The Crest in same space with other gas or oil-fired appliances
1.Follow the National Fuel Gas Code (U.S.) or CSA B149.1 (Canada) to size/verify size of the combustion/ventilation air openings into the space.
WARNING The space must be provided with combustion/ventilation air openings
correctly sized for all other appliances located in the same space as the Crest.
Failure to comply with the above warnings could result in severe personal injury, death, or substantial property damage.
2.Size openings only on the basis of the other appliances in the space. No additional air opening free area is needed for the Crest when it takes its combustion air from outside (direct vent installation).
Flooring and foundation
Flooring
The Crest is approved for installation on combustible flooring, but must never be installed on carpeting.
WARNING Do not install the boiler on carpeting even if foundation is used. Fire can result,
causing severe personal injury, death, or substantial property damage.
If flooding is possible, elevate the boiler sufficiently to prevent water from reaching the boiler.
WARNING Assure that the floor and structure is sufficient to support the installed weight
of the boiler, including the water content in the heat exchanger. If not, structural building failure will result, causing severe personal injury, death, or substantial property damage.
Vent and air piping
The Crest requires a special gas vent system, designed for pressurized venting.
The boiler is to be used for either direct vent installation or for installation using indoor combustion air. When room air is considered, see page 23 of this manual. Note prevention of combustion air contamination below when considering vent/ air termination.
Vent and air must terminate near one another and may be vented vertically through the roof or out a side wall, unless otherwise specified. You may use any of the vent/air piping methods covered in this manual. Do not attempt to install the Crest using any other means.
Be sure to locate the boiler such that the vent and air piping can be routed through the building and properly terminated. The vent/air piping lengths, routing and termination method must all comply with the methods and limits given in this manual.
Prevent combustion air contamination
Install air inlet piping for the Crest as described in this manual. Do not terminate vent/air in locations that can allow contamination of combustion air. Refer to Table 1A, page 9 for products and areas which may cause contaminated combustion air.
WARNING Ensure that the combustion air will not contain any of the contaminants in Table
1A, page 9. Contaminated combustion air will damage the boiler, resulting in possible severe personal injury, death or substantial property damage. Do not pipe combustion air near a swimming pool, for example. Also, avoid areas subject to exhaust fumes from laundry facilities. These areas will always contain contaminants.
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