A.O. Smith 1700 Panels and Covers, Chemical Vapor Corrosion, Installation Clearances, Leveling

PANELS AND COVERS

All panels and covers (e.g. control and junction box covers; front, side and rear panels of boiler) must be in place after service and/ or before opera­tion of boiler. This will ensure that all gas ignition components will be protected from water.

The XP is a low-pressure boiler (Category IV) to be used as either hot water supply (domestic/commercial water heating) or hot water heating (hydronic) application. Category IV appli­ances are often termed “High Effi­ciency” appliances.

CHEMICAL VAPOR CORROSION

Boiler corrosion and component failure can be caused by the heating and breakdown of airborne chemical vapors. Spray can propellants, cleaning solvents,­ refrigerator and air conditioning refrigerants,­ swimming pool chemicals, calcium and sodium chloride (water softener salt), waxes, and process chemicals are typical compounds which are potentially corrosive. These materials are corrosive at very low concentration levels with little or no odor to reveal their presence.

Products of this sort should not be stored near boiler. Also, air which is brought in contact with boiler should not contain any of these chemicals. If necessary, uncontaminated air should be obtained from remote or outside sources. Failure to observe this requirement will void warranty.

INSTALLATION CLEARANCES

This boiler is approved for installation in an alcove with minimum clearances to combustibles.

Table 12.  INSTALLATION CLEARANCES

	RECOMMENDED	CLEARANCES FROM
	SERVICE	COMBUSTIBLE
	CLEARANCES	MATERIALS
Front	30" (762 mm)	8" (203 mm)
Rear	36" (610 mm)	24" (610 mm)
Left	24 " (610 mm)	1" (25.4 mm)
Right	24 " (610 mm)	2" (51 mm)
Top	24" (610 mm)	6" (152 mm)

2” (51 mm) clearance is allowable from combustible construction for hot water pipes.

Sufficient area should be provided at the front and rear of the unit for proper­ servicing. In a utility room installa­tion, the door opening should be wide enough to allow the boiler to enter or to permit the replacement of another appli­ance such as a boiler.

FLOORING AND FOUNDATION:

All models are approved for installation on combustible flooring, but must never be installed on carpeting. 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.

LEVELING

Because this unit is a Category IV appliance it produces some amounts of condensation. The unit has a condensation disposal system that requires this unit to be level to properly drain. Each unit should be checked to be certain that it is level prior to starting the unit.

If the unit is not level, obtain and insert shims under the feet at the frame base to correct this condition.

AIR REQUIREMENTS

Breathing Hazard - Carbon Monoxide Gas

Install appliance in accordance with the Instruction Manual and NFPA 54 or CAN/CSA-B149.1.

To avoid injury, combustion and ventilation air must be taken from outdoors.

Do not place chemical vapor emitting products near water heater.

Breathing carbon monoxide can cause brain damage or death. Always read and understand instruction manual.

For safe operation an adequate supply of fresh uncontaminated air for combustion and ventilation must be provided.

An insufficient supply of air can cause recirculation of combustion products resulting in contamination that may be hazardous to life. Such a condition often will result in a yellow, luminous burner flame, causing sooting of the combustion chamber, burners and flue tubes and creates a risk of asphyxiation.

Do not install the boiler in a confined space unless an adequate supply of air for combustion and ventilation is brought in to that space using the methods described in the Confined Space section that follows.

Never obstruct the flow of ventilation air. If you have any doubts or questions at all, call your gas supplier. Failure to provide the proper amount of combustion air can result in a fire or explosion and cause property damage, serious bodily injury or death.

UNCONFINED SPACE

An unconfined space is one whose volume is not less than 50 cubic feet per 1,000 Btu/hr (4.8 cubic meters per kW) of the total input rating of all appliances installed in the space. Rooms communicating directly with the space, in which the appliances are installed, through openings not furnished with doors, are considered a part of the unconfined space.

Makeup air requirements for the operation of exhaust fans, kitchen ventilation systems, clothes dryers and fireplaces shall also be considered in determining the adequacy of a space to provide combustion, ventilation and dilution air.

UNUSUALLY TIGHT CONSTRUCTION

In unconfined spaces in buildings, infiltration may be adequate to provide air for combustion, ventilation and dilution of flue gases. However, in buildings of unusually tight construction (for example, weather stripping, heavily insulated, caulked, vapor barrier, etc.) additional air must be provided using the methods described in the Confined Space section that follows.

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