A.O. Smith VB/VW-500 - Manual (Page 11)

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shall be wide enough to allow the boiler to enter or to permit the
replacement of another appliance such as a boiler.
LEVELING
Each unit should be checked after installation to be certain
that it is level.
If the unit is not level, obtain and insert shims under the feet at the
frame base to correct this condition.
AIR REQUIREMENTS
UNCONFINED SPACE
In buildings of conventional frame, brick or stone construction,
unconfined spaces may provide adequate air for combustion.
If the unconfined space is within a building of tight construction
(buildings using the following construction: weather stripping, heavy
insulation, caulking, vapor barrier, etc.), air for combustion, ventilation,
and draft hood dilution must be obtained from outdoors or spaces freely
FIGURE 8.
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 the boiler. Also, air
which is brought in contact with the 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 the warranty.
INSTALLATION CLEARANCES
This boiler MUST NOT be installed on carpeted floors. This boiler is
approved for installation on combustible flooring in an alcove with
minimum clearances to combustibles of:
4" (102mm) Rear; 0" (0mm) Top and Sides; 6" (152mm) Vent. 2” (51mm)
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. Service clearances of 24" (610mm) in front, rear, top
and sides are recommended. In a utility room installation, the door opening
FIGURE 9. SIDEWALL EXHAUST VENTING