Install Instructions

Series 3 WATER BOILER — Boiler Manual

Connect breeching (continued)

Figure 5 Breech connection, typical, for gravity venting into chimney

Chimney venting (continued)

Connect breeching:

Long horizontal breechings, excessive

number of tees and elbows or other ob-

structions restricting combustion gas ﬂ ow

can result in possibility of condensation,

ﬂ ue gas leakage and carbon monoxide

emissions, which can lead to severe per-

sonal 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 chim-

ney 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,

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

applicable codes and regulations. Use draft gauge to

adjust proper opening.

The Ultra Oil boiler is capable of being

pressure ﬁ red. Overﬁ re pressure may be

positive even with a negative pressure

in the chimney. See the Ratings table on

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

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 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 draft fan:

• Seal all vent joints.

• Interlock burner with fan operation.

Part number 550-142-182/1014