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WATER BOILER
Connect breeching
Chimney venting
Connect breeching:
Table 2, page 12, and Figure 5, below.
2. Connection must be made above bottom of chimney
to avoid blockage. Breeching must not enter chim-
slip joint where breeching enters chimney to allow
removal for cleaning.
3. When burner and boiler are properly installed,
breeching draft will be approximately -0.01" to
-0.02" W.C. Install barometric control in breech-
ing, per control manufacturer's instructions, when
excess draft needs to be relieved or to comply with
adjust proper opening.
Part number 550-141-986/0112
— Boiler Manual
(continued)
(continued)
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
UO011
positive even with a negative pressure
page 39 for boiler draft loss.
The pressure in the breeching and chim-
ney must always be negative unless the
chimney and breeching are constructed
venting.
4. An induced draft fan for the chimney may be neces-
sary if:
be expected.
mum recommended.
5. When using an induced draft fan:
Typical locations for barometric
draft control (also see draft
control manufacturer's instructions)
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13
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