SERVICE TECHNICIAN ONLY — read and follow completely.
Typical location for
barometric control
(Also see control
manufacturer’s
instructions)
Flue pipe
bracket
(One on each
side of pipe)
Typical location for
barometric control
(Also see control
manufacturer’s
instructions)
Flue pipe bracket
(One on each
side of pipe)
0251-056_OVD
OVD Damper
(Required)
BVSS
(WMO-1)
(Integrated with damper)
BVSS must be installed
upstream of the barometric
damper
Typical location for
barometric control
(Also see control
manufacturer’s
instructions)
Flue pipe
bracket
(One on each
side of pipe)
0250-056_OVD
OVD
Damper
(Required)
Flue pipe
bracket
(One on each
side of pipe)
Typical location for
barometric control
(Also see control
manufacturer’s
instructions)
BVSS
(WMO-1)
(Integrated with damper)
BVSS must be installed
upstream of the
barometric damper
Connect breeching
(continued)
Figure 7
Back Outlet Breeching for models which
require a vent damper
Figure 8
Top Outlet Breeching for models which require
a vent damper
Figure 9
Back outlet breeching connection for models
which do not require a vent damper
Figure 10
Top outlet breeching connection for models
which do not require a vent damper
Part number 550-142-331/0421
17
WGO
OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 —
Boiler Manual