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1"
(25 mm)
min
Figure 13
combustible
material
Radiation Shield Installation
O23 unit
(top)
O23 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.
Install draft control at least 12 inches beyond the furnace. If
there is no space to install the draft control in the flue pipe it
may be installed in the vent above the flue pipe. Follow the
instructions packed with the 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 furnace
flue outlet.
Attach the provided finishing plate to cover 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 Lines 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 and no return
line should be adequate. See figure 14.
