Install Instructions
CG
i
GAS-FIRED
wATER
BOILER-
sERIEs
a-
Boiler
Manual
14
3a
3b
Table 3
Vent
connecto
r
diameter
Figure 7
Chimney
draft
venting
Venting - general information
CGi
venting
methods
-
Chimney
draft
or
Direct
exhaust
Chimney
draft
venting
Chimney d
ra
ft venting uses the natural
dr
aft provided
by a
vertical vent or chi
mn
ey.
Category I app
li
ance (non-
pos
iti
ve
ven
t s
tati
c pr
ess
ur
e
and
vent
gas
temperature
th
at avoi
ds
excessive condensate
produc
t
io
n
tn
vent).
See Section
3b
. Ch
im
ney draft installations use:
Direct
exhaust -
vertical
or
sidewall
Dir
ect exhaust
ve
nting uses inside
co
mbustion air wi
th
no
co
mbustion air
co
nn
e
ct
or piping. All
CG
i flue
ga
s
vents
are
pressurized, requiring careful
seal
i
n~
of
all
jo
ints. Category
Ill
appliance (positive vent
st
atic pres-
sure and vent gas teml?erature that avoids excessive
co
nd
e
ns
ate
pr
od
uc
ti
on m ve
nt
).
See
pages 15-19.
1.
Ve
nt
co
nn
e
ct
or (
sin
gle or do
ubl
e wa
ll
) sized to
eliminate positive
pr
essure
in
ve
nt
system.
Diam
eter
in
creases immediately
at
bo
iler.
Dir
ect exha
ust
installations use:
1. Ve
nt
pipe specified
in
this
manu
al
2.
Do
uble wall metal ve
nt
(B-ve
nt
) or
chinm
ey
with
liner approved by
th
e National
Fu
el Gas Code,
ANSI
Z2
23
.
1-lat
est editio
n,
o
rin
C
anadaBI4
9
.1
or
Bl49
.2
Installat
io
n
Co
de.
2.
Ve
nt
termin
a
ti
on
thr
ough outside wall, r
oo
f
or
tm
-
u
sed
chimney. Tight
ch
imney areas will make vent
j
oint
co
nstru
c
ti
on very difficult.
Venting - chimney
draft
venting
Boiler
''0'
1
Minimum
model
vent
connector
number diameter
CG;-
25
& CGi-3
4"
CGi-4
to
CGi-8 5"
Il-l
.-
- - Chimn
ey
I
&WAR
NIN
Gl
Inspect existing
ch
imn
ey
before in
st
alli
ng
boiler. Failure to
clean
or
r
el?
lace
pe
rf
orated
pipe or lining will
ca
use severe
personal inJury or death.
Ve
nt
sizing given
in
Table 3 is
on
ly a
ge
n
er
al
gu
id
elin
e.
Th
e
ve
nt
co
nnect
or
and
ch
im
ney mu
st
be
design
ed,
sized
and
co
ns
tru
cted in comp
li
ance with all applicable codes.
Fai
lure to
co
rrectly siu
and
install the vent system could res
ul
t in severe
personal injury,
dea
th
or substan
ti
al pr
operty
dam
age.
1.
Use
double
wall
metal vent (B-vent)
or
chimney with liner as
required by the National Fuel Gas Code,
ANSI
Z223
.
1-lat
est
edition, or
in
Canada, B149.1
or
B149.2 Installation Code.
2.
To preve
nt
downdra
fts,
chimn
ey
should extend at least 3
fee
t
above
th
e highest poi
nt
where it passes t
hr
ough a
roof
an
d
at least 2 feet higher than any
po
rti
on
of
a
bu
ilding
wi
thin
a
ho
rizontal d
is
tance
of
I 0 feet.
3. To vent
with
another appliance, see Natio
nal
Fuel
Gas
Cod
e,
ANSI
Z223
.1-latest edition or
in
Canada B149.2
or
B149.2
In
stallati
on
Code
4.
Do
not connect breeching to any portion of a mechanical
dr
aft
syste
m
th
at can o
per
ate un
der
posit
ive
pressu
re.
5.
Maintain
minimwn 2"
cl
e
aran
ce
from
combustible
materials
to
vent pipe.
6.
Do
not use chimney with
an
open fireplace.
7. Make horizontal
ru
ns as sh
ort
as possible. Long
ru
ns can
cause co
nd
en
sa
ti
on.
8.
When
longer
ru
ns are used, su
pp
ort pi
pe
wi
th
a
pp
rop
riate
hangers.
9.
To
p
revent
blockage, do not vent i
nt
o bo
tt
om
of
chi
mn
ey.
10. Ve
nt
pipe
must
not go beyond inside wall
of
chimne
y.
11.
Ve
nt
passing
through floors o r ceilings mu
st
be
firestopped.
12.
See
Figu
re
7
an
d Table 3
to
co
nnect boil
er
to
ve
nt
ing sys-
tem.
Part
Number
550-142-780/0712