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WTGO
OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 —
Connect breeching
General chimney requirements
•
Designed for natural draft firing. Connect boiler to vertical chim-
ney.
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 – latest edition, Installation of Oil-Burning Equipment.
•
NFPA 211 – latest edition, Standard for Chimneys, Fireplaces,
Vents and Solid Fuel Burning Appliances.
•
In Canada, refer to CSA B139, Installation Code for Oil-
Burning Equipment – latest edition.
•
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:
Type "L" double-wall vent — 6 inches
Single-wall vent
•
Minimum chimney sizes should be used.
Oversized chimneys, outside masonry chimneys and/or
de-rated inputs can result in condensation in chimney.
Connect breeching
Long horizontal breechings, excessive numbers 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 two (2) flue pipe brackets.
2. Connect full-sized breeching when possible. See Minimum Chim-
ney Size Table.
•
Back outlet — see Figures 7 and 9, page 17.
•
Top outlet — see Figures 8 and 10, page 17.
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.
— 9 inches
Boiler Manual
Table 3
Minimum chimney sizes
Minimum
Minimum
Boiler
breeching
Size
diameter
(Note 3)
WTGO-3
5"
8" x 8"
(Note 1)
WTGO-4
6"
WTGO-5
6"
8" x 8"
WTGO-6
(Note 1)
7"
WTGO-7
WTGO-8
8" x 12"
7"
(Note 2)
WTGO-9
NOTE:
1 6¾" x 6¾" inside liner
2 6½" x 10½" inside liner
3 Flue collar on boiler is 7" diameter
3. When burner and boiler are properly installed, draft
over fire 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.
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
minimum recommended.
•
Chimney height is less than recommended.
Seal all vent joints. Interlock burner with fan
operation.
5. Boiler models ending in "D", such as WTGO-3D, require
the installation of the Field Controls OVD-7 automatic
damper kit, Weil-McLain part number 381-800-515.
Refer to Figures 7 and 8, page 17.
AHRI
chimney size
Minimum
chimney
height
Rect .
Round
6"
15'
7"
15'
7"
20'
Part number 550-142-332/0421
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