Install Instructions

Part Number 550-142-902/1016
CGi
GAS-FIRED WATER BOILER — SERIES 3 — Boiler Manual
14
Venting — general information3a
Chimney draft venting
Chimneydraftventingusesthenaturaldraftprovided
byaverticalventorchimney.CategoryIappliance(non‑
positive vent static pressure and vent gas temperature
that avoids excessive condensate production in vent).
SeeSection3b.Chimneydraftinstallationsuse:
1. Vent  connector(single or double wall) sized to
eliminatepositivepressureinventsystem.Diameter
increases immediately at boiler.
2. Doublewallmetalvent(B‑vent)orchimneywith
liner approved by the NationalFuel Gas Code,
ANSIZ223.1/NFPA54–latestedition,orinCanada
B149.1orB149.2NaturalGasandPropaneInstal-
lationCode.
Direct exhaust — vertical or sidewall
Directexhaustventingusesinsidecombustionairwith
nocombustionairconnectorpiping.AllCGiuegas
vents are pressurized, requiring careful sealing of all
joints.CategoryIIIappliance(positiveventstaticpres-
sure and vent gas temperature that avoids excessive
condensateproductioninvent).Seepages15‑19.
Directexhaustinstallationsuse:
1. Ventpipespeciedinthismanual.
2. Ventterminationthroughoutsidewall,rooforun-
used chimney. Tight chimney areas will make vent
joint construction very difficult.
Venting — chimney draft venting3b
1. Usedoublewallmetalvent(B‑vent)orchimneywithliner
asrequiredbytheNationalFuelGasCode,ANSIZ223.1
/
NFPA54
–latestedition,orinCanada,B149.1orB149.2
NaturalGasandPropane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
/NFPA54 –latesteditionorinCanadaB149.2
orB149.2
NaturalGasandPropane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replace.
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oorsorceilingsmustberestopped.
12.See
Figure 7 and Table 3 to connect boiler to venting system.
Inspect existing chimney before installing boiler. Failure to
clean or replace perforated pipe or lining will cause severe
personal injury or death.
Table 3
Vent
connector
diameter
 Ve ntsizinggiveninTable 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 damage.
Figure 7
Chimney
draft
venting
Boiler
model
number
“D” Minimum
vent connector
diameter
CGi-25 & CGi-3
4”
CGi-4 to CGi-8
5”
CGi venting methods — Chimney draft or Direct exhaust