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water boiler
Connect breeching
Chimney venting
Connect breeching:
1. Connect full-sized breeching when possible. See
Table , page 11, and Figure , below.
. Connection must be made above bottom of chimney
to avoid blockage. Breeching must not enter chim-
ney far enough to cause obstruction. Use thimble or
slip joint where breeching enters chimney to allow
removal for cleaning.
. When burner and boiler are properly installed,
breeching draft will be approximately -0.01" to
-0.0" W.C. Install barometric control in breech-
ing, per control manufacturer's instructions, when
excess draft needs to be relieved or to comply with
applicable codes and regulations. Use draft gauge to
adjust proper opening.
Figure 5
1
— Boiler Manual
(continued)
(continued)
Long horizontal breechings, excessive
number of tees and elbows or other ob-
structions restricting combustion gas flow
can result in possibility of condensation,
flue gas leakage and carbon monoxide
emissions, which can lead to severe per-
sonal injury or death.
Breech connection, typical, for gravity venting into chimney
The Ultra Oil boiler is capable of being
pressure fired. Overfire pressure may be
positive even with a negative pressure
in the chimney. See the Ratings table on
page 9 for boiler draft loss.
The pressure in the breeching and chim-
ney must always be negative unless the
chimney and breeching are constructed
of vent piping designed for pressurized
venting.
4. An induced draft fan for the chimney may be neces-
sary if:
• Excessive resistance to flow of combustion g ases can
be expected.
• Cross-sectional area of chimney is smaller than mini-
mum recommended.
• Chimney height is less than recommended.
. When using an induced draft fan:
• Seal all vent joints.
• Interlock burner with fan operation.
Part number 550-141-986/1005
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