Installation and Operation Manual -
ODF, ODR, OUF, OLF & OLR Series
6
Combustion and Ventilation Air
Adequate provisions for combustion air, ventilation of
furnace, and dilution of the gases must be made. When a
furnace is installed in an unconfined space in a building, it
can be assumed that infiltration will be sufficient to supply
the required air.
If the furnace is installed in a confined space and combustion
air is taken from the heated space, the supply air and
ventilating air must be through two permanent openings of
equal area. A confined space is “a space whose volume is
less than 50 cubic feet per 1000 btu per hour of the combined
input rating of all appliances installed in that space.” One
opening must be within 12” of the ceiling and the other within
12” of the floor. Each opening must have a minimum free
area of at least 1 square inch per 1000 btu per hour of total
input rating of all appliances with the space but not less than
100 square inches.
If the furnace is installed in a space within a building of tight
construction, air must be supplied from outdoors. In this
case, one opening shall be within 12” of the ceiling and the
other within 12” of the floor. If vertical combustion ducts are
run, each opening must have a free area of at least 1 square
inch per 4000 btu per hour. If horizontal combustion ducts
are run, 1 square inch per 2000 btu per hour of the total
input of all appliances is required.
The furnace is designed to use air inside the dwelling for
combustion. If additional combustion air is required, installing
fresh air kit ABOOT571 allows air from outside the dwelling
to be brought in to the oil burner. This kit brings air into the
burner through air inlet ductwork run through the furnace
cabinet side panel and terminated outside the dwelling (see
Figure 4). The kit includes a vacuum relief valve to guard
against combustion problems associated with directly
connecting oil burners to the outside.
A return air duct system is recommended. Where there is
no complete return air duct system, a return connection
should be run full size to a location outside the confined
space and completely sealed so that no air from the confined
space can be circulated through the heating duct system.
Outdoor Make Up Air
A minimum mixed return air temperature of 60 - 65°F must
be maintained for outdoor make up air to prevent
condensation and corrosion.
Venting
Chimney
Before installing the furnace, a thorough inspection of the
chimney should be made to determine whether repairs are
necessary and that the chimney is of the proper size and
constructed in accordance with the requirements of the
National Board of Fire Underwriters or Canadian Standards
Association. The smallest dimension of the chimney should
be at least equal to the diameter of the flue pipe of the
furnace. Be sure the chimney will produce a steady draft
sufficient to remove all the products of combustion from the
furnace. A fabricated vent system the same size as the flue
outlet of the furnace may also be used. If a manufactured
vent is used, it must be listed for use with oil-fired equipment.
1.
Local building codes may have more stringent installation
requirements a nd should be consulted before installation
of the unit.
Figure 4
Fresh Air Kit ABOOT571 Installation
IMPORTANT: No more than 10’ of vertical piping allowed without
weight support.
This furnace is certified for use with Type “L” vent, Type
“A”, and “factory-built” chimneys. “B” vent must not be
used with oil furnaces.
WARNING
The barometric control shall be in the same atmospheric
pressure zone as the combustion air inlet to the furnace.
Deviation from this practice will cause improper burner
operation and may result in a fire hazard or injury.
WARNING
Combustion air openings in the front of the furnace must
be kept free of obstructions. Any obstruction will cause
improper burner operation and may result in a fire hazard
or injury.
WARNING
