Install Instructions
CG
i
GAS-FIRED
wATER
BOILER-
sERIEs
a-
Boiler
Manual
1 e Prepare boiler location -
air
openings
NOTICE
FREE AREA
of
openi
ngs
th
e
minimum
areas
gi
ven
in
this
m
anua
l are
free
area
{equals
th
e
area
,
length times width
of
opening, after deduction for
louver obstruction).
Use
the
free area information provided
by
th
e
lo
uver
ma
nufacturer.
Whe
n this
information
is not
availa
ble,
assu
m
e:
Wood louvers- assume free area
is
20% of total; so the
ac
tual area
of
each
openi
ng 'vith wood louvers would be 5 times
th
e required
free
area.
Metal lo
uvers-
assume free area is 60% of actual area; so, for
wood
louvers, the actual area
of
each opening
must
be
1.67 times
there
-
quired free area.
Single
air
opening
option
*
A single
co
mbustion a
ir
ope
ning
can
be used in lieu
of
th
e two-
open
i
ng
options on page I 0, provided:
Clearances
from
bolter
to
walls
Th
e boiler
must
ha
ve
clearances of
at
least
th
ose shown
in
Figure Ia,
page7.
Opening
must
be
directly
to
outside
Th
e opening
must
co
nn
ect
dir
ectly to the o
utd
oo
rs or to a space
t11
at
co
m
mun
icates directly
to th
e outd
oors
(no
t
to
an
inter
ior
space).
Th
e air can be provided throu
gh
a direct opening
or
through a horizontal
or
ve
rt
ical duct.
Opening
placement
Th
e top
of
th
e air opening
must
be within 12
in
ches
of
th
e ceilin
g.
Opening size
Th
e free area
of
th
e opening
must
be
at
least equal to
th
e
sum
of
th
e
areas
of
all equipment
ve
nt
co
nnectors in
the
sp
ace,
and
...
Th
e free area
of
th
e opening
must
be at least 1 square inch per 3,000
Btll/hr inp
ut
rating
of
all
eq
uipm
en
t locat
ed
in
t11
e space.
Exception
for
large
spaces
*
No
co
mbustion air ope
nin
gs
are needed when
t11
e
bo
iler (
and
ot
h
er
ap-
plian
ces}
are in
st
all
ed
in a space wi
th
a
vo
lum
e
at
least
50
cubic
feet
per
1,000 Btuh
of
all installed appliances, provided:
the
building
must
not
have
unusually
tight
construction
(see definition, this page).
all clearan
ce
s aratmd
th
e boil
er
must
be no less
than
shown
in
Figure Ia,
page 7.
To dete
rm
ine if
the
space is large enough
to
qua
lify:
Add
t11
e total
input
of
all appliances
in
JV!B
H ( 1
,OOO's
of Btuh).
Multiply this
munb
er
tin1
es 50 to detem1ine
mininmm
room
vo
lum
e.
Exan1ple: For a t
ota
l
input
of 100 MBH (100,000 Btuh),
mininmm
vol
um
e is 50 x
100
= 5,000
cub
ic
fee
t At a ceiling height
of
8
fe
.et,
th
e
space
must
ha
ve
at
least 5,000 + 8 = 625 square feet (25
fee
t x 25
fe
.et,
for instance).
Part
Nu
m
ber
550-142-780/0712
Unusually
tight
construction
Unusually tight
co
nstruction mea
ns
(per
ANSI
Z223.1)
buildings in which:
a.
Wal
ls
and
ceilings exposed to
th
e outside
atm
o-
sphere have a
co
ntinuous water vapor retarder wi
th
a rating
of
I perm or less with
ope
nings gasketed,
and
...
b.
Wea
th
er-s
trip
pi
ng has been
added
on
ope
nable
w
in
dows
and doors, a
nd
...
c.
Caulking or sealants
are
applied to areas
suc
h as
joi
nts
around windows
and
door
frames, between
sole
pl
ates
and
fl
oors, between wal
l-
ceilin
gjoi
nts
,
between wall panels,
at
penetrations for plumbing,
electrical,
and
gas lines,
and
in
othe
r
open
ings.
For
su
ch
con
str
uc
ti
on
cases,
if
appliances
use
in
si
de
air
for combustion, provide air
openings
Into
the
building
from
outside
. Size
and
locate
t11
ese
ope
nings per
th
e
appropriate
case in
Figure
3, 4
or
5
on
page 10.
Exhaust
fans
and
air
movers
The
appliance space
must
never be
under
a negative
pressure, even
if
the
appliance(s) are installed as
di
-
rect vent. Always provide air
ope
nings sized not
on
ly
to
th
e dimensions required for
th
e firing rate of all
app
li
ances,
but
also
to
handle
th
e air movement rate
of
the
ex
haust fans or a
ir
movers using air from the
building
or
space.
Motorized
air
dampers
If
th
e air openings are fitted wi
th
motorized dampers,
electrically interlock
the
dan1per to:
Preve
nt
th
e boil
er
from firing
if
th
e damp
er
is
n
ot
fully open.
Shut
th
e boiler down should
th
edan
1p
er
close
dur
-
ing
bo
il
er
operation.
To accomplish this i
nt
erl
oc
k, wire an
Isolated
contact
(p
roving
the
damp
er
ope
n) in series with
th
e
th
e
rm
o-
st
at
input
to
the
boiler. The boiler will not start
if
this
conta
ct
is
open,
and
will s
hut
down
should
it
open
dur
ing operation.
II