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Page 11

ÉÉÉÉÉÉÉÉ

1" (25 mm)

min

Figure 11

combustible

material

Radiation Shield Installation

SLO183B

unit

(top)

SLO183B

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)

12" (305 mm)

min

7" (178 mm)

min

see note 2

see note 3

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 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 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 and table 5 when determining
whether to use a single−or two−stage oil pump.

One−Pipe System

When using a one−pipe system with the oil tank above the
burner, or a one−pipe system with no more than an 8−ft.
(2.4m) lift and a vacuum of 6" (152 mm) Hg or less, a single−
stage fuel pump with a supply line should be adequate with-
out 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.

To determine pipe sizing for a one−pipe application, refer to
table 3.

Figure 12

Oil Piping

ÎÎÎÎÎÎÎÎÎÎÎ

Air Vent

Fill

Pipe

Oil

Tank

Fuel

Pump

Aux

Filter

Shut−Off

Valve

8 ft (2.4 m)

Maximum

Lift

One-Pipe System

Table 3

One−Pipe Oil Line Sizing

Line Length

Pipe Diameter (OD Tubing)

0−50’ (15 m)

3/8" (10 mm)

51−100’ (15 m)

1/2" (12 mm)

Two−Pipe System

When using a two−pipe system with the oil tank below the
level of the burner, a single−stage fuel pump should be used
in lift conditions of up to 10 feet (3 m) and/or a vacuum of
12" Hg or less. See figure 13. Use a two−stage fuel pump
when lift exceeds 10 feet (3 m) and/or the vacuum is in the
range of 12" Hg to 17" Hg.