Weil-McLain CGI-4E Boiler User Manual


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CGi-4E Gas-Fired Water Boiler — Boiler Manual
14
Part Number 550-110-711/1108
Venting — general information3a
CGi-4E venting methods — Chimney draft or Direct exhaust
Chimney draft venting
Chimneydraftventingusesthenaturaldraftprovidedbyaver-
tical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doublewall)sizedtoeliminateposi-
tivepressureinventsystem.Diameterincreasesimmediately
at boiler.
2. Doublewallmetalvent(B-vent)orchimneywithlinerap-
proved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
Directexhaustventingusesinsidecombustionairwithnocom-
bustionairconnectorpiping.TheCGi-4Euegasventispressur-
ized,requiringcarefulsealingofalljoints.CategoryIIIappliance
(positive vent static pressure 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unusedchim-
ney. Tight chimney areas will make vent joint construction
very difficult.
Venting — chimney draft venting3b
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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floorsorceilingsmustbefire-
stopped.
12.See
Figure 7 and Table 3 to connect boiler to venting sys-
tem.
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
Vent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
Chimnney
draft
venting
Boiler
model
number
“D” Minimum
vent connector
diameter
CGi-4E 5”
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