Williamson Series 2 - Vent Installation

7
Part Number 550-142-785/0812
GWI Series 2 Gas-Fired Water Boilers – Boiler Manual
Perform hydrostatic pressure test
Pressure test boiler before attaching water or gas piping or
electricalsupply(exceptasnotedbelow).
Prepare boiler for test
1. Removetheshippingnipple(fromGWIsupplytapping)and
removetheboilerreliefvalve.Temporarilyplugthereliefvalve
tapping with a ¾” NPT pipe plug.
2. Remove1¼”nipple,reducing teeanddrainvalvefrom ac-
cessorybag.Installinboilerreturnconnectionasshownon
in Figure 27, item 3, page 44.Installcirculatoroneitherthe
return or supply.
3. Remove 1¼” nipple, 1¼” tee, bushing and pressure/tempera-
turegaugefromaccessorybag.Pipetoboilersupplyconnec-
tion as shown in Figure 27, item 2, page 44.(Usepipedope
sparingly.)
4. Connectahosetoboilerdrainvalve,theotherendconnected
toafreshwatersupply.Makesurehosecanalsobeusedto
drainboileraftertest.
5. Connectanippleandshutoffvalvetosystemsupplyconnec-
tion on the 1¼” tee. This valve will be used to bleed air during
thell.(Valveandnipplearenotincludedwithboiler.)
6. Connectanippleandshutoffvalvetosystemreturnconnec-
tion(atcirculatorangeifcirculatorinstalledonreturn).This
valvewillbeusedtobleedairduringthell.(Valveandnipple
arenotincludedwithboiler.)
Fill and pressure test
1. Open theshutoffvalvesyouinstalledonsupplyandreturn
connections.
Pressure test
2. Slowlyopenboilerdrainvalveandfreshwatersupplytoll
boiler with water.
3. Whenwaterowsfromshutoffvalves,closeboilerdrainvalve.
4. Closeshutoffvalves.
5. Slowlyreopenboilerdrainvalveuntiltestpressureofnotmore
than 45 psi is reached on the pressure/temperature gauge.
6. Testatnomorethan45psifornomorethan10minutes.
 Donotleaveboilerunattended.Acoldwaterllcould
expandandcauseexcessivepressure,resultingin
severe personal injury, death or substantial property
damage.
7. Make sure constant gauge pressure has been maintained
throughouttest.Checkforleaks.Repairiffound.
 Leaksmustberepairedatonce. Failuretodoso
can damage boiler, resulting in substantial property
damage.
Do not use petroleum-based cleaning or sealing
compounds in boiler system. Severe damage to
boiler will occur, resulting in substantial property
damage.
Drain and remove fittings
1. Disconnectllwaterhosefromwatersource.
2. Drain boiler at drain valve or out hose, whichever provides
bestaccesstodrain.Removehoseafterdrainingifusedto
drain boiler.
3. Removenipplesandvalvesunlesstheywillremainforusein
the system piping.
4. Removeplugfromreliefvalvetapping.Seepage13toreplace
reliefvalve.
3 Vent installation
TheGWIboilercanbeventedusingoneofthefollowingmethods:
 Useonlytheventmaterialsandmethodsoutlined
inthismanual.Useofanyothermaterialsormeth-
odscouldresultinventfailureoruegasleakage,
causing severe personal injury, death or substantial
property damage.
Chimney draft venting
—Usesthenaturaldraftprovidedbyaverticalventorchimney.
Whenventedusingchimneydraftventing,GWIboilersarerated
asCategoryIappliances(nopressureinventanduegastem-
peraturehotenoughtoavoidexcessiveventcondensation).See
followingsectionforinstallationprocedures.
Chimneydraftinstallationsuse:
a. Ventconnector(singleordoublewall)sizedtoeliminatepositive
pressure in vent system. Diameter increases immediately at
boiler. See Figure 3, page 8forconnectorsizing.
b. Double-wallmetalvent(B-vent)orchimneywithlinerapproved
bytheNationalFuelGasCode,ANSIZ223.1–latestedition,
orinCanadaB149.1orB149.2InstallationCode.
Direct exhaust — vertical or sidewall
— Vent pipe is pressurized and terminated vertically through the
rooforthroughasidewall.Whenventedasdirectexhaust,GWI
boilersareratedasCategoryIIIappliance(positivepressurein
theventanduegastemperaturehotenoughtoavoidexcessive
ventcondensation).
Youmustuseonlytheventmaterialslistedinthismanual.See
pages 8 through 12 forinstallationprocedures.
Directexhaustinstallationsuse:
a. Vent materials specified in this manual.
b. Ventterminationthroughoutsidewall,rooforunusedchimney.
(Tightchimneyareaswillmakeventjointconstructionvery
difcult.)
GWI venting options
2 Prepare boiler continued