All installations and services must be performed by qualified service personnel.
2
Table 1: MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
TYPE
OF
UNIT
MODEL NO.
FROM
SIDES OF
FURNACE
FRONT
TOP &
SIDES
OF
PLENUM
FROM
THE
FLUE/VEN
T
REA
R
Lowboy
OL6**072D***
0”
6” ‡
1”
7”
0” ‡
Lowboy
OL8**119T60*
0”
6” ‡
1”
8”
0” ‡
‡ The minimum clearances listed in the preceding table are for fire protection. Clearance for
servicing the front and rear of the furnace should be at least 24 inches.
NOTE:
The OL6 & OL8 furnace are approved for closet installation. If the furnace is
installed in a closet, it requires two openings in the closet door for combustion air,
each having a minimum area of 181 sq. Inches. This free area intentionally exceeds
the recommended minimum free area of 1 square inch per 1000 BTUH of input rate.
Chimney Inspection
The chimney, vent, or any passageway for the stack gases to flow to the outdoor atmosphere is a
very important part of the heating system. No furnace, regardless of the efficiency of the design, can
perform satisfactorily when the chimney to which it is connected is inadequate or in poor condition.
Any of the following symptoms may indicate a chimney has severe structural damage and is
unsuitable for use.
Chimney appears to be leaning to the side.
Chimney appears to have structural damage, i.e. loose or missing blocks or bricks, or excessive
deterioration at mortar joints.
Tile liner damaged or missing.
Flue gas leakage along the length of the chimney between the chimney connector and discharge
termination.
Excessive corrosion at the cleanout port or at the chimney connector entrance into the chimney.
Structural debris, i.e. mortar or tile liner flakes, in base of the flue way.
A qualified person shall inspect the chimney to confirm it is correctly sized for the application,
properly constructed, and in sound condition. Refer to the Standard for the Installation of Oil-
Burning Equipment, NFPA 31-2001, for details on proper chimney sizing and construction. If
needed, the chimney should be cleaned before installing the furnace. Any accumulation of dirt or
debris at the bottom of the flue should be removed.
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