Buderus Logano G115 WS US/CA Installation And Service Instructions Manual page 18

5
Installing the boiler
Minimum clearances to combustible material
Flue pipe Type
Double-wall L
Single-wall L
Tab. 11 Minimum clearances to combustible objects for
flue systems
Minimum size of chimney
The minimum recommended chimney size is 8" x 8"
(6 ¾" x 6 ¾" inside liner) or 6" diameter with a minimum
height of 15 feet. Use a 5" flue pipe for connection to an
existing chimney.
Installing the flue pipe
Danger: Risk of death from escaping flue
gases.
If the resistance to flue gas flow is too great
and/or the flue pipe diameter is smaller than
the recommended size and/or the flue pipe is
too short:
V Seal all vent pipe joints.
V Install a CO alarm. Positive pressure com-
bustion ensures that the flue gas can exit
the flue system.
V Insert flue pipe 5" onto the breach and secure with
3 screws.
Avoid long horizontal flue pipe runs and keep
the number of elbows to a minimum.
V Install flue connections between boiler and chimney to
slope up at least ¼" per foot to the chimney.
V Connect the flue pipe to the chimney above the bottom
of the chimney to prevent blockages.
V Install cleaning and service hatches.
After starting the burner, set breeching draft to -0.01 to
-0.02 inches WC using a draft gauge. The overfire pres-
sure can be positive. If necessary, install a barometric
damper in the flue system to maintain the underpressure
in the system or to meet code requirements. Always install
the draft controller in vertical position. Use a draft gauge
when making adjustments.
18
Minimum clearance
6"
18"
Logano G115 WS US/CA - Technical specifications are subject to change without prior notice.
Fig. 12 Installing the flue pipe
1 Flue pipe
2 Boiler flue socket