A.O. Smith Boiler VB/VW- 750 User Manual

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11
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 sol vents, refrigerator and air conditioning
refrig erants, 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 con centration 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.
INSTALLTION CLEARANCES
ThisboilerMUSTNOTbeinstalledoncarpetedoors.Thisboiler
isapprovedforinstallationoncombustibleooring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.
Sufcientareashouldbeprovidedatthefrontandrearoftheunitforproper
servicing.Serviceclearancesof24”(610mm)infront,rear,topandsides
are recommended. In a utility room installa tion, the door opening shall be
wide enough to allow the boiler to enter or to permit the replacement of
another appli ance such as a boiler.
LEVELING
Each unit should be checked after in stal lation 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
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.
UNCONFINED SPACE
In buildings of conventional frame, brick or stone construction,
unconnedspacesmayprovideadequateairforcombustion.
Iftheunconnedspaceiswithinabuildingoftightconstruction
(buildingsusingthefollowingconstruction:weatherstripping,
heavyinsulation,caulking,vaporbarrier,etc.),airforcombustion,
venti lation, and draft hood di lu tion must be obtained from outdoors
or spaces freely communicating with the outdoors. The installation
instructionsforconnedspacesintightlyconstructedbuildings
must be followed to ensure adequate air supply.
UNUSUALLY TIGHT CONSTRUCTION
Inunconnedspacesinbuildings,inltrationmaybeadequateto
provideairforcombustion,ventilationanddilutionofue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ConnedSpacesectionthatfollows.
CONFINED SPACE
AConnedSpaceisonewhosevolumeislessthan50cubicfeet
per1,000Btu/hr(4.8cmperkW)ofthetotalinputratingofall
appliances installed in the space.
Openings must be installed to provide fresh air for combustion,
ventilationanddilutioninconnedspaces.Therequiredsizefor
the openings is dependent on the method used to provide fresh
airtotheconnedspaceandthetotalBtu/hrinputratingofall
appliances installed in the space.
DIRECT VENT APPLIANCES
Appliances installed in a Direct Vent configuration that
derive all air for combustion from the outdoor atmosphere
through sealed intake air piping are not factored in the total
appliance input Btu/hr calculations used to determine the
size of openings providing fresh air into confined spaces.
EXHAUST FANS
Where exhaust fans are installed, additional air should be provided
to replace the exhausted air. When an exhaust fan is installed in
thesamespacewithawaterheater,sufcientopeningstoprovide
fresh air must be provided that accommodate the requirements
for all appliances in the room and the exhaust fan. Undersized
openings will cause air to be drawn into the room through the
appliance vent system causing poor combustion. Sooting, serious
damagetotheapplianceandtheriskofreorexplosionmayresult.
It can also create a risk of asphyxiation.
LOUVERS AND GRILLES
The free areas of the fresh air openings in the instructions
that follow do not take in to account the presence of louvers,
grilles or screens in the openings.
The required size of openings for combustion, ventilation and
dilutionairshouldbebasedonthe“netfreearea”ofeachopening.
Where the free area through a design of louver or grille or screen
is known, it should be used in calculating the size of opening
requiredtoprovidethefreeareaspecied.Wherethelouverand
grille design and free area are not known, it should be assumed
that wood louvers will have 25% free area and metal louvers and
grilles will have 75% free area. Non motorized louvers and grilles
shouldbexedintheopenposition.
FRESH AIR OPENINGS FOR CONFINED SPACES
The following instructions should be used to calculate the
size, number and placement of openings providing fresh air for
combustion,ventilationanddilutioninconnedspaces. The
illustrations shown in this section of the manual are a reference

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