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

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19
DIRECT VENT INSTALLATION REQUIREMENTS
Follow the guidelines in the “HORIZONTAL INSTALLATION
REQUIREMENTS” section for the exhausting of flue
products.
IMPORTANT
The labels in the Direct Vent Kit must be affixed to the boiler
in locations specified by the instruction sheet provided in
the kit. The following are requirements for the Air-Intake
Terminal(AIT):
1. TheAir-IntakeSystem(AIS)mustterminatewiththeventing
equipment pro vided with the boiler, Refer to the parts list for
required direct vent parts.
2. TheAITshallnotbelocatedlessthan3feet(1.0m)below
anyexhaustventwithin10feet(3.0m),see “HORIZONTAL
INSTALLATIONREQUIREMENTS”section.
3. The total horizontal distance of the AIS from the boiler’s Blower
Adaptertotheoutsideofthe“AIT”shallnotbegreaterthan70
“equivalent”feet(21.3m)ofventpipenorlessthan3feet(1.0m),
excluding elbows. A maximum of 3 elbows, equiva lent to 10 feet
(3.0m)eachofpipemaybeused.
For all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled water heaters installed
in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by
theCommonwealthandwherethesidewallexhaustventterminationislessthanseven(7)feetabovenishedgradeinthe
areaoftheventing,includingbutnotlimitedtodecksandporches,thefollowingrequirementsshallbesatised:
INSTALLATION OF CARBON MONOXIDE DETECTORS At the time of installation of the side wall horizontal vented gas fueled
equipment,theinstallingplumberorgasttershallobservethatahardwiredcarbonmonoxidedetectorwithanalarmandbatteryback-up
isinstalledontheoorlevelwherethegasequipmentistobeinstalled.Inaddition,theinstallingplumberorgasttershallobservethat
a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling, building
or structure served by the sidewall horizontal vented gas fueled equipment. It shall be the responsibility of the property owner to secure
theservicesofqualiedlicensedprofessionalsfortheinstallationofhardwiredcarbonmonoxidedetectors.
In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the hard wired
carbonmonoxidedetectorwithalarmandbatteryback-upmaybeinstalledonthenextadjacentoorlevel.
In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner shall
haveaperiodofthirty(30)daystocomplywiththeaboverequirementsprovidedthatduringsaidthirty(30)dayperiod,abattery
operated carbon monoxide detector with an alarm shall be installed.
APPROVED CARBON MONOXIDE DETECTORS Each carbon monoxide detector as required in accordance with the above
provisionsshallcomplywithNFPA720andbeANSI/UL2034listedandCSAcertied.
SIGNAGE Ametalorplasticidenticationplateshallbepermanentlymountedtotheexteriorofthebuildingataminimum
heightofeight(8)feetabovegradedirectlyinlinewiththeexhaustventterminalforthehorizontallyventedgasfueledheating
applianceorequipment.Thesignshallread,inprintsizenolessthanone-half(1/2)inchinsize,“GAS VENT DIRECTLY
BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.”
INSPECTION The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the
installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance
withtheprovisionsof248CMR5.08(2)(a)1through4.
EXEMPTIONS:Thefollowingequipmentisexemptfrom248CMR5.08(2)(a)1through4:
1.TheequipmentlistedinChapter10entitled“EquipmentNotRequiredToBeVented”inthemostcurrenteditionofNFPA54
as adopted by the Board; and
2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from the
dwelling, building, or structure used in whole or in part for residential purposes.
MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM PROVIDED When the manufacturer of Product
Approved side wall horizontally vented gas equipment provides a venting system design or venting system components with the
equipment, the instructions provided by the manufacturer for installation of the equipment and the venting system shall include:
1. Detailed instructions for the installation of the venting system design or the venting system components; and
2. A complete parts list for the venting system design or venting system.
MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED When the manufacturer
ofaProductApprovedsidewallhorizontallyventedgasfueledequipmentdoesnotprovidethepartsforventingtheue
gases,butidenties“specialventingsystems,”thefollowingrequirementsshallbesatisedbythemanufacturer:
1.Thereferenced“specialventingsystem”instructionsshallbeincludedwiththeapplianceorequipmentinstallationinstructions;and
2.The“specialventingsystems”shallbeProductApprovedbytheBoard,andtheinstructionsforthatsystemshallincludea
parts list and detailed installation instructions.
A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment, all venting
instructions, all parts lists for venting instructions, and/or all venting design instructions shall remain with the appliance or
equipment at the completion of the installation.
INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS

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