Page 4
Requirements
WARNING
Product contains fiberglass wool.
Disturbing the insulation in this product during
installation, maintenance, or repair will expose you
to fiberglass wool dust. Breathing this may cause
lung cancer. (Fiberglass wool is known to the State
of California to cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact
your supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379-9900
WARNING
Improper installation, adjustment, alteration, ser
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and ser
vice must be performed by a qualified installer or
service agency.
Installation of Lennox oil-fired furnaces must conform with
the National Fire Protection Association Standard for the
Installation of Oil Burning Equipment, NFPA No. 31, the
National Electrical Code, ANSI/NFPA No.70 (in the
U.S.A.), CSA Standard CAN/CSA-B139 (in Canada),
Installation Code for Oil Burning Equipment, the Canadian
Electrical Code Part1, CSA 22.1 (Canada), the recom
mendations of the National Environmental Systems Con
tractors Association and any state or provincial laws or lo
cal ordinances. Authorities having jurisdiction should be
consulted before installation. Such applicable regulations
or requirements take precedence over general instruc
tions in this manual.
Chimneys and chimney connectors must be of the type
and construction outlined in section 160 of NFPA No. 31.
Air for combustion and ventilation must conform to stan
dards outlined in section 140 of NFPA No. 31 or, in Cana
da, CSA Standard B139. When installing ELO183DH units
in confined spaces such as utility rooms, two combustion
air openings are required. Dimensions of combustion air
openings are shown in table 1. One opening shall be below
burner level and the other opening shall be no more than 6
inches from the room's ceiling.
Combustion air openings should provide a minimum free
area one‐half square inch per 1,000 Btu per hour input.
This combustion air should be brought into the area con
taining the furnace below the level of the furnace burner.
IMPORTANT
An opening to the outside for combustion air is
strongly recommended, especially in new homes.
Refer to table 1 or the unit rating plate for specific
combustion air opening dimensions.
Table 1
Combustion Air Opening Dimensions
Model No.
(2 openings required)
ELO183DH
-101/114
10” X 20”
ELO183DH
-135/150
11” X 22”
This unit is approved for clearances to combustible materi
al as listed unit rating plate and in tables 2 or 3. Unit service
and accessibility clearances take precedence over fire
protection clearances.
Table 2
Horizontal Installation Clearances
Clearances
Inches (mm)
Top of Cabinet
3 (76)
*Bottom and Rear of Cabinet
1 (25)
Front of Cabinet
24 (610)
Service Clearance (Front)
24 (610)
End of Supply Plenum
0 (0)
Supply Air Opening
0 (0)
Return Air Opening
0 (0)
Above Horizontal Warm Air Duct
within 3 ft. (914mm) of Furnace
0 (0)
Flue Pipe Horizontal
7 (178)
Flue Pipe Vertical
7 (178)
*NOTE-When furnace is installed on combustible floor,
1” (25 mm) spacer legs must be installed to elevate unit
off of mounting surface.
