Buderus Logano G115/3 WS 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
Table 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:
▶ Seal all vent pipe joints.
▶ Install a CO alarm. Positive pressure combustion
ensures that the flue gas can exit the flue system.
▶ 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.
▶ Install flue connections between boiler and chimney to slope up at
least ¼ " per foot to the chimney.
▶ Connect the flue pipe to the chimney above the bottom of the
chimney to prevent blockages.
▶ 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 pressure 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"
Fig. 12 Installing the flue pipe
[1] Flue pipe
[2] Boiler flue socket
Logano G115 WS US/CA – 6 720 813 418 (2019/09)