Oil Furnace L85 Series Installation Manual

507148-01Issue 1406Page 4 of 13
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 oor. 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.
As supplied, 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 1). The kit includes a
vacuum relief valve to guard against combustion problems
associated with directly connecting oil burners to the
outside.
Figure 1. Fresh Air Kit ABOOT571 Installation
IMPORTANT: No more than 10’ of vertical piping allowed without
weight support.
Intake
Air
Hood
Field Supplied
4Piping”
Mounts Through
Furnace Cabinet
To Vent System
Flue
Furnace
Cabinet
Furnace Boot™
NX Beckett
Burner
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
re hazard or injury.
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 re hazard or injury.
WARNING
The barometric control must be removed from the vent
pipe when using a combustion air adapter. Deviation
from this practice will cause improper burner operation
and may allow ue products into the living space which
may result in personal injury or death.
WARNING
Circulating Air Supply
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 conned
space and completely sealed so that no air from the
conned 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
ue pipe of the furnace. Be sure the chimney will produce
a steady draft su󰀩cient to remove all the products of
combustion from the furnace. A fabricated vent system the
same size as the ue outlet of the furnace may also be
used. If a manufactured vent is used, it must be listed for
use with oil-red equipment.
This furnace is certied for use with Type “L” vent, Type
“A”, and “factory-built” chimneys. “B” vent must not be
used with oil furnaces.
WARNING