27
WARNING
The boiler may not work properly if a non-original split base kit is installed.
Air intake
The minimum length of the air intake pipe is 1 metre.
Each wide-radius 90° bend (R=D) installed on the air intake pipe is equal to 1 m linear length.
Each narrow-radius 90° bend (R<D) installed on the air intake pipe is equal to 1.5 m linear length.
The load loss of the air intake terminal is not to be taken into consideration.
The air intake terminal provided with the anti-pulse device contained in the split base kit must be installed without the Ø 51 mm air
diaphragm.
Flue gas system
Each wide-radius 90° bend (R=D) installed on the flue pipe is equal to 2 m linear length.
Each narrow-radius 90° bend (R<D) installed on the flue pipe is equal to 4 m linear length.
A flue pressure switch is fitted to the boiler. It controls the flue gas discharge flow rate.
If the flue gas discharge and/or air intake system malfunctions, the device shuts down the boiler to prevent
unsafe operation (see subsection 1.3.3)
Pipe length (m)
Flue gas discharge
diaphragm (mm)
1 < L < 5*
Ø 47
5 < L < 10.5*
Ø 49
10.5 < L < 21.5*
No diaphragm
* excluding the first elbow connected to the boiler
FLUE GAS
DIAPHRAGM
AIR DEFLECTOR
NEOPRENE
GASKET
SEALING CAP
FLUE GAS
DEFLECTOR
pic. 17 - Air intake / flue gas discharge with split ducts
(CTFS and RTFS)
pic. 18 - Dimensions for connecting to the split air
intake/flue gas discharge pipes
Configuration of Ø 80 mm flue gas dischar-
ge and air intake pipes
Example no. 1 (pic. 19)
Primary air intake and flue gas discharge
through two opposing outside walls.
Example no. 2 (pic. 19)
Primary air intake through outside wall and
flue gas discharge through the roof.
Example no. 3 (pic. 20)
Primary air intake through outside wall and
flue gas discharge through the same wall.
320
450
750
219
134
Ø 80
85
120
60 mm
325
The following are merely an indication. For installation of optional fittings please refer to the instruction enclosed to the same fittings.
