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1"
(25 mm)
min
Fi
ure 11
combustible
material
Radiation Shield Installation
ELO183UF
unit
(top)
ELO183UF UNIT
(front)
radiation
shields
flue
pipe
unit
cabinet
NOTE 1−Radiation shields must be constructed of 24 gauge sheet
metal minimum.
NOTE 2−Radiation shields required when A is less than 9" (229 mm).
NOTE 3−Radiation shields should extend from the top of the unit to
the top of the flue pipe.
noncombustible
spacers
radiation shields
(see note 1)
See note 2
See note 3
7"
(178 mm)
min
12"
(305 mm)
min
B
A
A
Use 24 gauge or heavier galvanized smoke pipe and fit-
tings to connect the furnace to the vent. Connect flue pipe
to chimney using the least number of elbows and angles
possible. Flue pipe or vent connector must be inserted into
but not beyond the outside wall of the chimney flue. No re-
duction in diameter of flue pipe is acceptable. It is best to
have flue pipe as short and direct as possible. Where two or
more appliances vent into a common flue, the area of the
common flue should be at least equal to the area of the larg-
est flue or vent connector, plus 50% of the area of any addi-
tional flues or vent connectors. Install a barometric draft
control (provided) and flue pipe according to instructions
packed with control.
Inspect flue pipe annually. Clean soot or ash from flue pipe,
if necessary. If pipe is rusted, replace.
Barometric Draft Control Installation
Install the provided barometric draft control in the flue pipe
at least 12 inches beyond the furnace flue outlet to provide
space for flue gas sampling. The barometric draft control
may be installed in either vertical or horizontal sections of
the flue pipe; however, it should be positioned no more
than 18" beyond the furnace flue outlet. Follow the instruc-
tions packed with the barometric draft control.
Alternate Side Flue Connections
The vent pipe may exit the top or sides of the cabinet. A
hole is provided in the top cap for top exit. For side exit, lo-
cate the center hole punched in the side of the cabinet. See
unit dimensions on page 2. Using it as the center point, cut
a 6 inch (152 mm) round hole in the cabinet’s side. Install
the barometric draft control within 18 inches of the fur-
nace flue outlet. Attach the provided finishing plate to cov-
er rough edges.
Supply & Return Air Plenums
Secure return air plenum to unit using sheet metal screws.
NOTE − The following are suggested procedures that should
be followed when installing the supply air plenum.
1 − Use sealing strips of fiberglass.
2 − In all cases, the plenum should be secured to furnace or
evaporator cabinet with sheet metal screws.
3 − Install supply and return air ducts as desired.
Oil Supply Line Sizing
Ensure that the restrictions of the piping system, plus any
lift involved, do not exceed the capability of the oil pump.
Use the following guidelines when determining whether to
use a single−or two−stage oil pump.
One−Pipe System
When using a one−pipe system even with the oil tank that is
above the burner and a vacuum of 6" (152 mm) Hg or less,
a single−stage fuel pump with a supply line should be ade-
quate without a separate return line. See figure 12.
Manual bleeding of the fuel pump is required on initial start
up. Failure to bleed air from the oil pump could result in an
air lock/oil starvation condition.
NOTE − As an extra precaution, cycle heating on and off ten
times after bleeding air from the oil pump. This will elimi-
nate air in the gun assembly.
Figure 12
Oil Piping
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air vent
fill
pipe
Oil
Tank
fuel
pump
Aux
Filter
Shut−off
Valve
8 ft (2.4 m)
Maximum
One Pipe Lift
One-Pipe System
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