Weil-McLain CGi Series 3 Installation And Maintenance Manual page 11
Gas-fired
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CG i
GAS-FIRED wATER BOILER- sERIEs a -
Boiler Manual
1
e
Prepare boiler location - air openings
NOTICE
FREE AREA
of openings
the
minimum areas
given
in
this
manual
are
free area
{equals
the
area,
length
times
width
of
opening, after
deduction
for
louver
obstruction).
Use
the
free area
information
provided by the
louver
manufacturer.
When
this
information
is not
available,
assume:
Wood
louvers
-
assume
free
area is 20%
of total;
so
the actual
area
of
each opening
'vith
wood louvers would
be
5
times
the
required
free
area.
Metal
louvers-
assume free area is 60%
of
actual area; so, for wood
louvers,
the
actual
area of each opening
must
be
1.67 times
there-
q uired free
area.
Single air opening option
*
A single combustion
air
opening
can
be used
in
lieu of the
two-opening
options o
n
page
I
0,
provided:
Clearances from bolter to walls
The
boiler
must
have
clearances
of
at
least
those
shown in
Figure
Ia,
page7.
Opening must be directly
to outside
The
opening
must
connect directly
to
the outdoors or
to
a space t11at
communicates directly to
the o utdoors
(not
to an
interior space).
The
air can be provided
thro ugh a direct
opening
or
through
a
horizontal
or vertical
duct.
Opening placement
The
top
of the air
opening
must
be
within
12 inches of the ceiling.
Opening size
The
free area
of
the
opening must
be
at least
equal
to
the
sum
of
the
areas of
all equipment
vent
connectors
in
the
space,
and
...
The
free
area
of
the
opening
must
be
at
least
1
square inch
per 3,000
Btll/hr in put
rating
of
all
equipment
located in t11e space.
Exception
for large
spaces
*
No
combustion
air openings are needed
when
t11e
boiler (and
other ap
-
pliances} are installed
in a
space
with
a
volume
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 clearances aratmd
the boiler
must
be
no less
than shown
in
Figure
Ia,
page
7.
To determine if
the
space
is
large
enough
to
qualify:
Add
t11e
total input
of
all appliances in
JV!BH
(
1
,OOO's
of
Btuh).
Multiply this
munber
tin1es
50
to detem1ine
mininmm
room
volume.
Exan1ple:
For a
total
input
of
100
MBH
(100,000
Btuh),
mininmm
volume is 50
x
100
=
5,000 cubic
feet At a
ceiling height
of
8
fe.
e t,
the
space
must
have
at
least
5,000
+
8 = 625 square
feet
(25
feet
x
25
fe.
e
t,
for
instance).
Part
Number
550-142-780/0712
Unusually
tight construction
Unusually
tight
construction means
(per ANSI
Z223. 1)
buildings
in
which:
a.
Walls
and
ceilings
exposed to the outside
atmo-
sphere
have a
continuous
water
vapor retarder
with
a
rating
of
I perm
o
r
less with
openings gasketed,
and ...
b.
Weather-stripping has
been
added
on openable
windows and doors,
and
...
c. Caulking o
r
sealants
are applied
to
areas
such
as
joints around windows and door frames, between
sole
plates and
floors,
between
wall-ceilingjoints,
between wall
panels, at
penetrations
for
plumbing,
electrical, and
gas lines,
and in
other
openings.
For such
construction
cases,
if
appliances use
inside air
for
combustion,
provide air
openings
Into the building
from
outside.
Size and
locate t11ese
openings
per
the
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 openings sized
not
only
to
the
dimensions required
for the
firing rate
of all
appliances, but also to handle
the air
movement rate
of the
exhaust
fans
or
air
movers using air
from the
building
or space.
Motorized air dampers
If
the air
openings are fitted
with
motorized
dampers,
electrically interlock
the dan1per
to:
Prevent
the
boiler
from firing if
the
damper
is
not
fully
open.
Shut
the
boiler
down should
thedan1per
close
dur-
ing boiler operation.
To accomplish
this interlock,
wire
an Isolated
contact
(proving
the
damper open)
in
series
with
the
thermo-
stat
input to the
boiler. The
boiler will
not
start
if
this
contact is open, and
will
shut
down
should
it
open
during operatio
n.
II
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