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wiring and electrical connections of the air conditioning
controls.
5. COMBUSTION AIR
If the furnace is installed in a closet or utility room, two
openings
must
be
provided
connecting
to
a
well-
ventilated
space
(full basement,
living room
or other
room
opening
thereto,
but
not
a
bedroom
or
bathroom).
One
opening
shall
be located
above
the
level of the upper vent opening and one opening below
the
combustion
air inlet opening
in the front of the
furnace. Each opening shail have a minimum free area
of 1%
square
inches
per
1,000
Btu/h
of total
input
rating of all appliances installed in the room.
For furnaces
located
in
buildings
of unusually
tight
construction,
such
as those with high quality weather
stripping,
caulking,
windows
and
doors,
or
storm
sashed windows, or where basement windows are well
sealed,
a permanent
opening
communicating
with
a
well
ventilated
attic
or
with
the
outdoors
shail
be
provided, using a duct if necessary. The duct opening
shall have a free area of 1% square inches per 1,000
Btu/h
of
total
input
rating
of
all
appliances
to
be
installed.
When
a
furnace
is
installed
in
a_
full
basement,
infiltration is normally adequate
to provide
air for combustion and draft operation. Furnace rooms
under 65m? (700 ft*) should automatically be treated as
confined space.
6. CHIMNEY VENTING
The
flue
pipe
should
be
as
short
as
possible
with
horizontal pipes sloping upward toward the chimney at
a rate of one-quarter
inch to the foot. The flue pipe
should not be smaller in cross sectional area than the
flue collar on the furnace. The flue pipe should connect
to the chimney
such
that the flue pipe extends
into,
and
terminates
flush
with
the
inside
surface
of the
chimney liner. Seal the joint between the pipe and the
lining. The chimney outlet should
be at least two feet
above the highest point of a peaked
roof. All unused
chimney
openings
should
be closed.
Chimneys
must
conform
to local, provincial
or state codes,
or in the
absence of local regulations, to the requirements of the
National Building Code.
NOTE:
THE
FURNACE
IS
APPROVED
FOR
USE WITH TYPE L VENT OR EQUIVALENT.
ACAUTION
CHIMNEY
VENTED
VERSIONS
OF
THE
FURNACE
MUST
BE
CONNECTED
TO
A
FLUE
HAVING
SUFFICIENT
DRAFT AT ALL
TIMES
TO
ENSURE
SAFE
AND
PROPER
OPERATION OF THE APPLIANCE.
NOTE:
THE
RECOMMENDED
OVER-FIRE
DRAFT PRESSURE IS -0.02 IN. W.C. (SEE FIG.
1).
The
flue
pipe
must
not
pass
through
any
floor
or
ceiling, but may pass through a wail where suitable fire
protection provisions have been installed. Refer to the
latest edition
of CAN/CSA
B-139
for rules governing
the installation of oil burning equipment.
In the United
States,
refer
to
the
latest
edition
of
NFPA
31
for
regulations
governing
the
installation
of oil
burning
equipment.
See appendix A for burner set-up.
Fig. 1: Checking Over-Fire Draft.
7. BAROMETRIC DAMPER CONTROL.
The barometric damper control, also known
as a draft
regulator,
is used
on
conventional
chimney
venting
only. This
control
automatically
maintains
a constant
negative
pressure
in the furnace
to obtain
maximum
efficiency.
It ensures
that
proper
pressures
are
not
exceeded.
If the chimney
does
not develop sufficient
draft, the draft control
cannot
function
properly.
The
draft regulator, when
installed should
be in the same
room
or
enclosure
as
the
furnace
and
should
not
interfere
with
the
combustion
air
supplied
to
the
burner.
The
control
should
also be
located
near the
furnace
flue
outlet
and
installed
according
to
the
instructions supplied with the regulator. The flue outlet
pressure
(measured
between
the
furnace
and
draft
regulator,
or the oil burner
mounting
plate over-fired
draft access port.
Fig 1) should be set to -0.02 in. w.c.
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