Williamson Series 2 - Page 8

8
Part Number 550-142-785/0812
GWI Series 2 Gas-Fired Water Boilers – Boiler Manual
3 Vent installation continued
Chimney draft venting
 Inspect existing chimney before installing boiler.
Failuretocleanorreplaceperforatepipeorlining
will cause severe personal injury or death.
Vent sizing given in Figure 3 is only a general
guideline. The vent connector and chimney must
be designed, sized and constructed in compliance
with all applicable codes. Failure to correctly size
and install the vent system could result in severe
personal injury, death or substantial property dam-
age.
See page 4foradditionalrequirementswhenchim-
neydraftventing.
1. Usedoublewallmetalvent(B-vent)orchimneywithlineras
requiredbytheNationalFuelGasCode,ANSIZ223.1–latest
edition,orinCanada,B149.1orB149.2InstallationCode.
2. Topreventdowndrafts,chimneyshouldextendatleast3feet
abovethehighestpointwhereitpassesthrougharoofand
atleast2feethigherthananyportionofabuildingwithina
horizontaldistanceof10feet.
3. Toventwithanotherappliance,seeNationalFuelGasCode,
ANSIZ223.1–latesteditionorinCanadaB149.2orB149.2
InstallationCode
4. Donotconnectbreechingtoanyportionofamechanicaldraft
system that can operate under positive pressure.
5. Maintainminimum2”clearancefromcombustiblematerials
to vent pipe.
6. Do not use chimney with an open fireplace.
7. Make horizontal runs as short as possible. Long runs can
cause condensation.
8. When longer runs are used, support pipe with appropriate
hangers.
9. Topreventblockage,donotventintobottomofchimney.
10.Ventpipemustnotgobeyondinsidewallofchimney.
11. Vent passing through floors or ceilings must be firestopped.
12. See Figure 3 to connect boiler to venting system.
Figure 3 Chimney draft venting installation