115
EN
8.6
Smoke outlet and combustion air inlet
The smoke outlet MUST be sized by an expert and installed by an
installer who MUST use approved materials, suited to the type
of appliances, and follow the best practice technical guidelines
and comply with the national and local legislation in force
m
CAUTION
– Smoke outlets that are inadequate or the wrong
size can have a negative impact on the combustion
parameters and amplify the combustion noise.
– The smoke outlet on each boiler in the cascade
should be connected to an exhaust flue. When
necessary, use motorised valves (SCR), (see "
M
SCR
Øi
Øi
M
SCR
Øi
M
SCR
Fig. 46
Smoke outlet connections
DESCRIPTION
ALU HE
80
116
160
200
240
280
Øi (internal
diameter)
mm
160
160
160
200
200
200
Combustion air inlet
For “type C” configurations, the combustion air inlet ducts
MUST be fed outside of the installation room and must power
each single appliance in the cascade singularly.
d
IT IS FORBIDDEN
create a manifold with the combustion air inlet ducts.
The table shows the maximum permitted lengths for the
combustion air inlet ducts, expressed in metres.
ALU HE
Maximum permitted length (m)
Inlet
Øi 80 mm
Inlet
Øi 100 mm
80
10
-
116
9
-
160
8
-
200
-
10
240
-
9
280
-
8
Load loss - Equivalent lengths
ALU HE
Leq (linear metres)
Inlet
Outlet
45° Ø 80
mm curve
90° Ø 80
mm curve
45° Ø 160
mm curve
90° Ø 160
mm curve
80
0,5
1
0,5
1
116
0,75
1,5
0,75
1,5
160
1
2
1
2
ALU HE
Leq (linear metres)
Inlet
Outlet
45° Ø 100
mm curve
90° Ø 100
mm curve
45° Ø 200
mm curve
90° Ø 200
mm curve
200
0,5
1
0,5
1
240
0,75
1,5
0,75
1,5
280
1
2
1
2
8.7
Gas line
The gas supply line manifold (CG) must be sized by an expert,
and implemented during installation according to the line
pressure and the heat input of the appliances that make up the
cascade.
G
G
G
CG
Fig. 47
8.8
Evacuating condensate
To evacuate the condensate, create a manifold with all of the
ducts, appliances and smoke outlet and put a neutralising
device in place, such as one of the models that can be supplied
separately on request.
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