Williamson Series 2 - Vent System

4
Part Number 550-142-785/0812
GWI Series 2 Gas-Fired Water Boilers – Boiler Manual
1 Prepare boiler location continued
 Failuretofollowallinstructionscanresultinuegas
spillageandcarbonmonoxideemissions,causing
severe personal injury or death.
When removing boiler from existing common vent system:
Atthetimeofremovalofanexistingboiler,thefollowingsteps
shall be followed with each appliance remaining connected to
the common venting system placed in operation, while the other
appliances remaining connected to the common venting system
are not in operation.
a. Seal any unused openings in the common venting system.
b. Visuallyinspecttheventingsystemforpropersizeandhori-
zontalpitchanddeterminethereisnoblockageorrestriction,
leakage,corrosionorotherdeciencieswhichcouldcausean
unsafecondition.
c. Testventsystem—Insofarasispractical,closeallbuilding
doors and windows and all doors between the space in which
the appliances remaining connected to the common venting
system are located and other spaces of the building.Turn
on clothes dryers and any appliance not connected to the
commonventingsystem.Turnonanyexhaustfans,suchas
rangehoodsandbathroomexhausts,sotheywilloperateat
maximumspeed.Donotoperateasummerexhaustfan.Close
fireplace dampers.
d. Place in operation the appliance being inspected. Follow the
lighting/operatinginstructions.Adjustthermostatsoappliance
will operate continuously.
e. Testforspillageatdrafthoodreliefopeningafter5minutesof
mainburneroperation.Usetheameofamatchorcandle.
f. Afterithasbeendeterminedthateachapplianceremaining
connected to the common venting system properly vents when
testedasoutlinedabove,returndoors,windows,exhaustfans,
fireplace dampers, and any other gas-burning appliance to
theirpreviousconditionsofuse.
Anyimproper operation of common ventingsystem should be
corrected so the installation conforms with the National Fuel
GasCode,ANSIZ223.1–latestedition.Correctbyresizingto
approach the minimum size as determined using the appropriate
tablesinPart11ofthatcode.Canadianinstallationsmustcomply
withB149.1orB149.2InstallationCode.
Chimney draft vent requirements
1. Venting must be installed according to Part 7,Venting of
Equipment,ofNationalFuelGasCode,ANSIZ223.1-latest
editionandapplicablebuildingcodes.Canadianinstallations
mustcomplywithB149.1orB149.2InstallationCodes.
2. Chimneyorventtermination:
• Achimney,oranyventotherthanaTypeBventwithlisted
ventcap,mustextendatleast3feetabovethehighest
pointwhereitpassesthrougharoofofabuilding,andat
least2feethigherthananyportionofabuildingwithina
horizontaldistanceof10feet.
• TypeBventswithlistedcapsmayterminateasinFigure2
ifnocloserthan8feetfromaverticalwallorsimilarob-
struction.
• Otherwise,Type B ventsmust terminateatleast 2 feet
abovetheroofpenetrationandatleast2feethigherthan
anyportionofabuildingwithin10feet.
3. Alinedchimneyispreferredandmustbeusedwhenrequired
by local, state, provincial and national codes, laws, regulations
and ordinances. Vitreous tile linings with joints that prevent
retentionofmoistureandliningsmadeofnoncorrosivemateri-
alsarebest.Adviceforueconnectionsandchimneylinings
canbeobtainedfromlocalgasutility.TypeBdouble-wallmetal
vent pipe or single-wall vent pipe may be used as a liner.
4. Cold masonrychimneys,alsoknownasoutsidechimneys,
typicallyhaveoneormorewallsexposedtooutsideair.
When any atmospheric gas-fired boiler with automatic vent
damperisventedthroughthistypeofchimney,thepotential
existsforcondensationtooccur.Condensationcandamage
amasonrychimney.Manufacturerrecommendsthefollowing
to prevent possible damage.
a. Linechimneywithcorrosion-resistantmetallinersuchas
AL29-4C®single-wallstainlesssteelorB-vent.Sizeliner
perNationalFuelGasCodeANSIZ223.1–latestedition.
b. Provide drain trap to remove any condensate.
5. Where two or more gas appliances vent into a common chim-
neyorvent,equivalentareashouldbeatleastequaltoareaof
ventoutletonlargestapplianceplus50percentofventoutlet
areaofadditionalappliance.
Direct exhaust venting (Category III) — DO NOT
COMMON venttheGWIinadirectexhaustsystem
(CategoryIII).Connectingmorethanoneappliance
toadirectexhaustsystemwillcauseuegasspill-
ageorappliancemalfunction,resultinginpossible
severe personal injury, death or substantial property
damage.
 Inspect existing chimney before installing boiler.
Failureto clean or replace perforated pipe or tile
lining will cause severe personal injury or death.
Vent system
 GWI boilers can be either chimney draft vented
or direct-exhaust vented. See pages 7 to 12 for
detailed installation instructions.
 Ifyouareremovinganexistingboilerfromashared
ventingsystemandthenewGWIboilerwillnotshare
theventsystem(allowedonlywhenchimneydraft
venting),youmusttesteachremainingappliance
individuallytoverifytheventsystemstilloperates
adequately.Followguidelinesbelow.
Figure 2 Terminations with Type B vent tted with listed
cap, provided vent is at least 8 feet from any
vertical wall or similar obstruction.