Connect Breeching; General Chimney Requirements - Weil-McLain WGO Manual

WGO
GOLD OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 —

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.
16
SERVICE TECHNICIAN ONLY — read and follow completely.
Boiler Manual
Table 3
Minimum chimney sizes
Minimum
Boiler
breeching
chimney size
model
diameter
number
(note 3)
Rect.
WGO-2
5"
8" x 8"
WGO-3
(note 1)
WGO-4
6"
WGO-5
6"
8" x 8"
WGO-6
(note 1)
7"
WGO-7
WGO-8
8" x 12"
7"
(note 2)
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
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.
Part number 550-141-826/1014
Minimum
AHRI
Minimum
chimney
height
Round
6" 15'
7" 15'
7" 20'