Heating engineer
30
3
4. Position the flue gas exhaust in the lead-in in the
top panel.
5. Secure the flue gas exhaust to the upper lead-in
with the three screws.
6. Fit the blind cover on the rear flue gas exhaust.
7. Fit the gas unit heater top panel back on.
3.3.2
Combustion air intake fitting
▶
Ø 80 mm with gasket, on the rear, at the top (see di-
mensional diagrams, Paragraph 1.2
3.3.3
Installation types
The lengths in following Tables are intended for
installations where the air and/or flue gas exhaust
ducts follow linear paths as shown in the respec-
tive Figures. Otherwise, you must proceed with
the calculation of the pressure drop (Paragraph
If ducts other than those supplied by the manufac-
turer are used, make sure that they are suitable for
the unit on which they are installed. In particular,
the temperature class of the duct must be appro-
priate for the operating characteristics of the unit,
and must also respect the chemical-physical sta-
bility of the system itself.
The material used for the flue gas exhaust duct
must be class W1 according to EN 1443 and there-
fore suitable to withstand the action of condensate
of combustion products from gaseous fuels.
In any case, use approved ducts according to the
type of installation to be made. Upon request,
Robur can supply suitable rigid pipes, coaxial ducts
and terminals.
Gas unit heaters of the Next-G series can be installed to
one of the following ways.
3.3.3.1
B23 type installation with wall flue gas exhaust
pipe
Figure 3.1
B23 type installation with Ø 80 flue gas exhaust pipe
Table 3.2
B23 type maximum allowed length
Indicative maximum lengths (m)
Next-G
Flue gas exhaust pipe
Ø 80
Ø 100
Ø 110
G 20 EC
30
30
30
G 30, G 30 EC
30
30
30
G 35 EC
30
30
30
G 45, G 45 EC
30
30
30
G 60, G 60 EC
27
30
30
G 75 EC
18
30
30
G 90, G 90 EC
19
30
30
3.3.3.2
B23 type installation with roof flue gas exhaust
pipe
Figure 3.2
B23 type installation with Ø 80 roof flue gas exhaust
pipe
Table 3.3
B23 type maximum allowed length with roof flue gas
exhaust pipe
Indicative maximum lengths (m)
Next-G
Flue gas exhaust pipe
Ø 80
Ø 100
Ø 110
G 20 EC
30
30
30
G 30, G 30 EC
30
30
30
G 35 EC
30
30
30
G 45, G 45 EC
30
30
30
G 60, G 60 EC
24
30
30
G 75 EC
15
30
30
G 90, G 90 EC
16
30
30
