Immergas EOLO STAR 24 4E Instructions And Warnings page 23

• Temperature loss in insulated flue ducting. To prevent pro-
blems of flue gas condensate in the insulated exhaust pipe Ø 80,
due to flue gas cooling through the wall, the length of the pipe
must be limited to 12 metres. The figure (Fig. 25) illustrates a
typical insulation application in which the intake pipe is short
and the exhaust pipe is very long (over 5 m). The entire intake
pipe is insulated to prevent moist air in the place where the boiler
is installed, in contact with the pipe cooled by air entering from
the outside. The entire exhaust pipe, except the elbow leaving
the splitter is insulated to reduce heat loss from the pipe, thus
preventing the formation of fume condensate.
N.B.: when installing the insulated pipes, a section clamp with
gusset must be installed every 2 metres.
NON-INSULATED PIPE
Drain (metres)
1
2
3
4
5
* The air intake pipe can be increased to 2.5 metres if the exhaust bend
is eliminated, 2 metres if the air intake bend is eliminated, 4.5 metres
eliminating both bends.
The boiler is designed to evacuate the
combustion products up to a maximum
extension of 27 linear metres from the
exhaust, with 1 m plus 90° bend at the in-
take. If the installation requests a development
of the flue to the discharge that exceeds the
recommended 12 m, due consideration must
be given to the formation of condensate that
could take place inside the pipe and Immergas
insulated "Blue Series" flue kits must be used.
It's not allowed that condensation flow towards
the appliance from exhaust ducts.
Maximum usable lengths
(including intake terminal with grill and two 90° bends)
Intake (metres)
36.0*
34.5*
33.0*
32.0*
30.5*
INSULATED PIPE
Drain (metres)
6
7
8
9
10
11
12
Intake (metres)
29.5*
28.0*
26.5*
25.5*
24.0*
22.5*
21.5*
23