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Connect breeching(continued)
UO011
Typical locations for barometric
draft control (also see draft
control manufacturer's instructions)
Chimney venting (continued)
Long horizontal breechings, excessive num-
ber of tees and elbows or other obstructions
restricting combustion gas ow can result in
possibility of condensation, ue gas leakage
and carbon monoxide emissions, which can
lead to severe personal injury or death.
1. Connect full-sized breeching when possible. See
Table 2, page 12, and Figure 5, below.
2. Connection must be made above bottom of chimney to
avoid blockage. Breeching must not enter chimney far
enough to cause obstruction. Use thimble or slip joint
where breeching enters chimney to allow removal for
cleaning.
3. When burner and boiler are properly installed, breech-
ing dra will be approximately -0.01” to -0.02” W.C.
Install barometric control in breeching, per control
manufacturer’s instructions, when excess dra needs
to be relieved or to comply with applicable codes and
regulations. Use dra gauge to adjust proper opening.
e Ultra Oil boiler is capable of being
pressure red. Overre pressure may be
positive even with a negative pressure
in the chimney. See the Ratings table on
page 39 for boiler dra loss.
e 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 dra fan for the chimney may be neces-
sary if:
• Excessive resistance to flow of combustion gases can
be expected.
• Cross-sectional area of chimney is smaller than mini-
mum recommended.
• Chimney height is less than recommended.
5. When using an induced dra fan:
• Seal all vent joints.
• Interlock burner with fan operation.
Part number 550-143-013/0621
13
Series 3
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