Page 8
Indoor Coil Placement
Please consult the manufacturer of your evaporator coil for
their recommendations on distance required between an
oil heat exchanger and their drain pan. Adequate space
must be provided between the drain pan and the furnace
heat exchanger.
Venting
WARNING
Combustion air openings in front of the furnace must
be kept free of obstructions. Any obstruction will
cause improper burner operation and may result in
a fire hazard.
WARNING
The barometric draft control must be removed from
the vent pipe when using an air intake kit. Deviation
from this practice will cause improper burner opera
tion and may allow flue products into the living space
which may result in personal injury or death.
An air intake kit used to to provide fresh air directly to the
burner, is available through Lennox. Order part number
11F44.
Fi
ure 8
Vacuum
Relief
Valve
Air Intake Kit
Air Intake Kit Installed
CAUTION
Do not store combustible materials near the furnace
or supply air ducts. The material (such as paint, mo
tor oil, gasoline, paint thinner, etc.) may ignite by
spontaneous combustion creating a fire hazard.
WARNING
This furnace is certified for use with type “L” vent.
“B” vent must not be used with oil furnaces.
Prior to installation of unit, make a thorough inspection of the
chimney to determine whether repairs are necessary. Make
sure the chimney is properly constructed and sized accord
ing to the requirements of the National Fire Protection Asso
ciation. The smallest dimensions of the chimney should be
at least equal to the diameter of the furnace vent connector.
Make sure the chimney will produce a steady draft sufficient
to remove all the products of combustion from the furnace. A
draft of at least .04” w.c. (9.9 Pa) is required during burner
operation.
1 - Local building codes may have more stringent installa
tion requirements and should be consulted before
installation of unit.
2 - The vent connector should be as short as possible to
do the job.
3 - The vent connector should not be smaller than the out
let diameter of the vent outlet of the furnace.
4 - Pipe should be at least 24 gauge galvanized.
5 - Single wall vent pipe should not run outside or through
any unconditioned space.
6 - Chimney should extend 3 feet (0.9 m) above highest
point where the vent passes through the roof, and 2
feet (0.6 m) higher than any portion of a building within
a horizontal distance of 10 feet (3 m).
7 - The vent must not pass through a floor or ceiling.
Clearances to single wall vent pipe should be no less
than 6” (152 mm); more if local codes require it.
8 - The vent may pass through a wall where provisions
have been made for a thimble as specified in the Stan
dards of the National Board of Fire Underwriters. See fig
ure 9.
Wall Thimble
Figure 9
Thimble
Vent Pipe
Combustible
Wall
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