Unical Alkon Cargo 35, Installation Manual

Page: 23 / 48

23
Instructions for the installer
FLUE CONFIGURATION Ø80 mm
Example N.2
Intake of primary air and flue outlet from two external perimeter
walls.
It is not permitted to position the two terminals on opposite
walls.
Example N.1
Intake of primary air from the perimeter wall and flue outlet
from the roof.
CALCULATION OF THE PRESSURE LOSSES OF
THE COMBUSTION AIR INLET/PRODUCTS
OUTLET DUCTS
When calculating the pressure losses bear in mind the
following parameters:
- For the twin flue pipe system’s adaptor, the pressure loss is
of 4 Pa;
- For each large radius 90° bend Ø 80 (R=D), the pressure
loss is of 14 Pa;
- For each metre of Ø 80 flue pipe the pressure loss is of 1 Pa
in the combustion air inlet;
- For each metre of Ø 80 flue pipe the pressure loss is of 1,5
Pa in the combustion product outlet;
- For the Ø 80 L=1 horizontal combustion air inlet terminal
the pressure loss is of 3,5 Pa;
- For the Ø 80 L=1 horizontal combustion products outlet
terminal the pressure loss is of 5,5 Pa;
- For the vertical flue outlet duct Ø 80 L=1 the pressure loss
is of 8 Pa.
Note:
These values refer to flue systems made with
original UNICAL non flexible and smooth
pipes.
Verification Example n°2 :
- 1 twin flue pipe adaptor .............................................. 4 Pa
- 2 short radius 90° bends Ø 80 ................................. 28 Pa
- 15 mt. Ø 80 pipe (combustion air inlet) ..................... 15 Pa
- 15 mt. Ø 80 pipe (combustion products outlet) ...... 22.5 Pa
- 1 Ø 80 horizontal air inlet flue pipe ....................... 3,5 Pa
- 1 Ø 80 horizontal flue outlet pipe .......................... 5,5 Pa
Total pressure loss: 78,5 Pa
Verification Example n°1 :
- 1 twin flue pipe adaptor .............................................. 4 Pa
- 3 short radius 90° bends Ø 80 ................................. 42 Pa
- 4 mt. Ø 80 pipe (combustion air inlet) ....................... 4 Pa
- 20 mt. Ø 80 pipe (combustion products outlet) ......... 30 Pa
- 1 vertical Ø 80 flue pipe ........................................... 8 Pa
Total pressure loss = 88 Pa