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Inspect
chimney
to make certain
it is constructed
according
to the latest
revision
of the NFPA
211.
Local
regulations
may differ from
this code
and
should
be checked.
Where
there is a conflict,
the
local code will prevail.
The boiler must be installed
into a chimney
which
has a masonry
or metallic
chimney
liner.
An unlined
chimney
wilt have leaks that wilt cause
poor
chimney
performance
(no draft),
and could
result
in a positive
pressure
in the
combustion
chamber.
Horizontal
portions of the venting system should not
exceed
10 feet in length. Horizontal
lengths over 10
ft. will
have
a negative
effect
on the
chimney
performance.
The chimney
should extend
at least 2 ft. above any
portion of the building within 10 ft. (Figure 9) It should
produce
a -.02 inch W.C. draft in the combustion
chamber.
See "Chimney
or Vent
Sizes"
chart for
recommended
minimum
and maximum
chimney
or
vent sizes.
Inadequate
draft will cause
improper
combustion,
resulting
in dirty flue ways and high fuel bills.
Connect
flue
pipe same
size as boiler
outlet
to
chimney,
sloping
upward
continuously
toward
the
chimney
approximately
1/4" per foot. Bolt or screw
joints together
to avoid sag.
If an oil fired water heater is vented into the same flue
as the boiler, provide a separate hole into the chimney
whenever
possible.
When this isn't possible,
use a
"Y" connection
in the flue pipe, using a separate
draft
regulator
for each unit. When
a chimney
will not
provide
adequate
draft to handle the input from the
water
heater
and boiler
simultaneously,
wire the
units so that only one wilt operate
at a time, favoring
the water heater.
I_,_
NO_E
THAN
J.O'(3,1
H)
q&o'
(3,_
M)
/
HEZGHT
ABOVE
ANY
_._{
Roo_ GuR_AOE W ITHIN
le"
C3._
M)
HORIZONTALLY
RIDGE
(
.8.f.
M)
"CHIMNEY
3"
c , 9;2.
M ) MIN.
M
N.
i
l
I
I
GAS
VENT
OR
TYI_E
L
VENT
2
'
I
i
(
. 6,L
M
MIN.
i 1-t
CHIMNEY OR VENT SIZES
ROUND
BTU/HR INPUT
INCHES
MIN
MAX
91,,_0"0" 140_ 00_
175,000 - 210,000
7
8
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
r_;
315,000
8
10
SQUARE
HEIGHT
INCHES
(FT)
MIN I MAX MIN
MAX
8x8 I 8x10
15
40
8x8 I 8x12
15
50
Oil tank and piping should be installed in accordance
with the National
Board of Fire Underwriters
and
local regulations.
Oil storage tank, vent, fill pipe and
caps should
be as prescribed
by local codes.
In no
case should
the vent pipe be smaller
than
1-1/4"
I.P.S. The fill pipe should
not be less than 2" I.P.S.
The suction line from the tank to the burner should be
one continuous
piece of tubing to prevent
air enter-
ing the line. The suction
line, must
be 3/8" O.D.
copper
tubing
for runs of 50 feet or less, and 1/2"
O.D. for longer runs. An oil return line, same size as
the suction
line, must be used on any installation
where the bottom of the tank is below the fuel unit of
the burner.
Oil lines should
be buried or otherwise
protected
from mechanical
injury. Flare fittings on all
oil lines are recommended.
Compression
fittings on
the suction
line often allow air to be drawn
into the
fuel pump, making it difficult to maintain
oil pressure
at the nozzle.
Do not run overhead
fuel lines from
tank to oil burner.
Fuel pump connections
and by-pass should be made
according
to instructions
attached
to the fuel pump.
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