Robur Next-R - Page 32

Heating engineer
32
3
Table3.8 C33 type maximum allowed length with 100/150 roof
coaxial terminal
Indicative maximum lengths (m)
Air pipe Flue gas exhaust pipe
Ø 80 Ø 100 Ø 80 Ø 100
R15 30 30 30 30
R20 30 30 30 30
R30 19 30 19 30
R40 14 30 14 30
R50 5 21 5 21
R60 1 10 1 10
R80 - 1 - 1
Table3.9 C33 type maximum allowed length with 130/210 roof
coaxial terminal
Indicative maximum lengths (m)
Air pipe Flue gas exhaust pipe
Ø 80 Ø 110 Ø 130 Ø 80 Ø 110 Ø 130
R15 30 30 30 30 30 30
R20 30 30 30 30 30 30
R30 21 30 30 21 30 30
R40 15 30 30 15 30 30
R50 7 30 30 7 30 30
R60 3 26 30 3 26 30
R80 2 21 30 2 21 30
3.3.3.6 C53 type installation with separate ducts
Figure3.6 C53 type installation with Ø 80 separate ducts
A Right side view
A
Table3.10 C53 type maximum allowed length with separate
ducts
Indicative maximum lengths (m)
Air pipe Flue gas exhaust pipe
Ø 80 Ø 100 Ø 110
R15 1 30 30 30
R20 1 30 30 30
R30 1 30 30 30
R40 1 24 30 30
R50 1 12 30 30
R60 1 7 29 30
R80 1 6 26 30
3.3.4 Sizing and installing combustion air/
exhaust fumes ducts
In order to dimension the duct system, the total pressure
drop of the system must be calculated.
The total allowed pressure drop in the ue gas exhaust
system depends on the unit model (Table 3.11 p.33 ).
The pressure drops of the ue and air pipes available as
Robur optional are shown in Table 3.12 p.33 .
Table 3.13 p.33 shows the pressure drops for Ø 100 ue
and air pipes in aluminium, available on the market.
The pressure drops of the coaxial pipes available as Robur
optional are shown in Table 3.14 p.33 .
Resistance from the separate terminals are negligible
since they are very low.
When designing, it must be checked that the total pres-
sure drop of the piping system is lower than the maximum
pressure drop allowed for the unit (Table 3.11 p.33 ). An
example of how to calculate pressure drops is given in
Paragraph 3.3.5 p.34 .
The maximum lengths of air and ue gas exhaust pipes,
depending on the type of installation, are shown in tables
under the installation type gures, described in Paragraph
3.3.3 p.30 .
The above lengths are intended to be approxi-
mate values for standard installations where the
air and ue gas exhaust ducts follow linear paths
as shown in the respective gures. Otherwise, you
must proceed with the calculation of the pressure
drop (Paragraph 3.3.5 p. 34 ): installation will be
permitted if the total pressure drop is lower than
the maximum admissible pressure drop (Table
3.11 p.33 ).
The Ø 80, 110 and 130 pipes available as Robur op-
tional are made of stainless steel, while the Ø 100
adapters available as Robur optional are made of
aluminium.