Boiler Installation
7
Logano G125 BE - Specifications subject to change without notice.
19
7.1.1 Vertical Venting Systems
The G125 BE boiler can be vented vertically using an
existing masonry chimney or a factory built All-Fuel or L-
vent chimney.
7.1.1.1 Masonry Chimney
Refer to NFPA 31 for requirements on chimney venting.
Old, cold or over-sized chimneys require the use of an
approved 5" chimney liner (
Î
Page 20).
The maximum vent length of a masonry chimney is 60 ft.
A masonry chimney is operated under slight negative
pressure, and requires a barometric damper.
z
Follow damper manufacturer’s instructions as to
placement.
z
Adjust draft for negative 0.02 – 0.04" W.C.
NOTICE
Due to tight construction of modern
homes, Buderus recommends drawing
combustion air from outdoors. The boiler is
factory prepared for connecting 4" rigid
pipe ducted directly to the increaser at the
rear of the boiler. For further directions
Î
Chapter 7.2, page 28.
Except for direct venting, and provided
ample combustion air is available in the
boiler room, combustion air can also be
drawn from the room (
Î
Chapter 7.2,
page 28 for details).
NOTICE
For Canada the G125 BE is approved
without a Blocked Vent Switch.
Should local authorities require a Blocked
Vent Switch
Î
Chapter Fig. 63, page 68.
Fig. 12
Masonry chimney installation
1
Chimney
2
Barometric damper
3
Clean-out
4
Horizontal air connection for combustion air
(optional, see 7.2)
1
3
4
2
Venting system: Masonry Chimney
Comment
Draft
Combus-
tion air
Max. vent length
Barometric
damper
required
Negative Outside air
or room air
60 ft.
WARNING!
DANGER TO LIFE
from toxic flue gases.
z
Verify that all vent pipe connections
have been installed properly.
z
Have the entire venting system cleaned
and inspected annually by a qualified
service company.
