Connect breeching, Boiler manual – Weil-McLain 550-141-826/1201 User Manual

Page 16

SERVICE TECHNICIAN ONLY — read and follow completely.

Connect breeching

General chimney requirements

• Designed for natural draft firing. Connect boiler to vertical chimney.

• Insufficient draft can cause flue gas leakage and carbon monoxide

emissions, which will lead to severe personal injury or death.

• Use vent material approved by local codes for oil-fired burners. In their

absence, refer to:
• NFPA 31, Installation of Oil-Burning Equipment.
• NFPA 211, Standard for Chimneys, Fireplaces, Vents and Solid Fuel

Burning Appliances.

• In Canada, refer to CSA B139, Installation Code for Oil-Burning

Equipment.

• NFPA 211 requires chimney to be lined before connected to boiler.

• Inspect existing chimney before installing new boiler. Failure to do any

of the following will result in severe personal injury or death:

• Clean chimney, including removal of blockage.

• Repair or replace damaged pipe or liner.

• Repair mortar and joints.

• To prevent downdrafts, extend chimney at least 3 feet above highest

point where it passes through roof and 2 feet higher than any portion

of building within 10 feet. Increase chimney cross-sectional area and

height at least 4% per 1,000 feet above sea level.

• Minimum clearances from vent pipe to combustible material:

• 6 inches — Type “L” double-wall vent
• 9 inches — Single-wall vent

• Minimum chimney sizes should be used.

Oversized chimneys, outside masonry chimneys and/or

derated inputs can result in condensation in chimney.

Connect breeching:

Long horizontal breechings, excessive number of tees and

elbows or other obstructions restricting combustion gas flow

can result in possibility of condensation, flue gas leakage

and carbon monoxide emissions, which can lead to severe

personal injury or death.

1. Install 2 flue pipe brackets.

2. Connect full-sized breeching when possible. See Minimum Chimney

Size Table.
• Back outlet — see Figure 7, page 17.
• Top outlet — see Figure 8, page 17.

3. 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.

4. When burner and boiler are properly installed, draft

overfire will be approximately -0.01" to -0.02" W.C.

Install barometric control in breeching, 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.

5. An induced draft fan for the chimney may be

necessary if:
• Excessive resistance to flow of combustion gases

can be expected.

• Cross-sectional area of chimney is smaller than

minimum recommended.

• Chimney height is less than recommended.

Seal all vent joints. Interlock burner with

fan operation.

Boiler

model

number

Minimum

breeching

diameter

(note 3)

Minimum

I=B=R

chimney size

Minimum

chimney

height

Rect.

Round

WGO-2

8" x 8"

(note 1)

15'

WGO-3

WGO-4

WGO-5

8" x 8"

(note 1)

15'

WGO-6

WGO-7

WGO-8

8" x 12"

(note 2)

20'

WGO-9

Note 1

6¾" x 6¾" inside liner

Note 2

6½" x 10½" inside liner

Note 3

Flue collar on boiler is 7" diameter

Table 3

Minimum chimney sizes

Part number 550-141-826/1211

GOLD

WGO

OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 —

Boiler Manual