Operating instructions

4
Part Number 550-142-784/0812
GWA 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
horizontal 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
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 or vent requirements
1. Venting must be installed according to Part 7,“Venting of
 Donotalterboilerdrafthoodorplaceanyobstruction
or non-certified vent damper in breeching or vent
system.CSAcerticationwillbecomevoid.Fluegas
spillageandcarbonmonoxideemissionswilloccur
causing severe personal injury or death.
 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
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. See“Ratings”onPage 46forminimumchimneyorventsizes.
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
obstruction.
• 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
materials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.Thefollowingarerecommended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
chimney 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.
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
 Thefollowingrequirementsapplywhenyouremove
anexistingboilerfromaventsystemsharedwith
other appliances. If the new boiler will not use the
common vent, you must test (as described below)
eachremainingappliance—operatingbyitself—to
verifythattheventsystemoperatesadequately.