21
INS
TALLER
U
SER
M
AINTEN
AN
CE
TECHNI
CI
AN
TECHNI
CAL
D
AT
A
Key (Fig. 9, 10)
A
- Maximum flow set
B
- Minimum flow set*
C
- Minimum external temperature*
D
- Maximum external temperature *
E
- Climatic curve offset
* Functions reserved for Service
1.13 IMMERGAS FLUE SYSTEMS
Immergas supplies various solutions separately from the boilers regarding the installation of air intake terminals and flue exhaust, which
are fundamental for boiler operation.
The boiler must be installed with an original Immergas “Green Range” inspectionable air intake system and visible flue gas ex-
traction system made of plastic, with the exception of the C
6
configuration, as required by the regulations in force and by the
product’s approval. This flue system can be identified by the specific identification mark bearing the following indication: “only
for condensation boilers”.
For non-original flue system, refer to the technical data of the appliance.
The plastic pipes cannot be installed outdoors, for tracts longer than 40 cm, without suitable protection from UV rays and other
atmospheric agents.
Resistance factors and equivalent lengths
Each flue component has a Resistance Factor based on experimental tests and specified in the table below.
The Resistance Factor for individual components is independent from the type of boiler on which it is installed and has a dimensionless
size.
It is however, conditioned by the temperature of the fluids that pass through the pipe and therefore, varies according to applications for
air intake or flue exhaust.
Each single component has a resistance corresponding to a certain length in metres of pipe of the same diameter; the so-called equivalent
length, can be obtained from the ratio between the relative Resistance Factors.
All boilers have an experimentally obtainable maximum Resistance Factor (R) equal to 100.
The maximum Resistance Factor allowed corresponds to the resistance encountered with the maximum allowed pipe length for each
type of Terminal Kit.
This information allows calculations to be made to verify the possibility of setting up various flue configurations.
To dimension the flue ducting using commercial components, refer to the table of combustion parameters (Par. 4.2).
A
B
11
Positioning the gaskets (black) for “green range” flue systems.
Position the gasket correctly (for bends and extensions) (Fig. 11):
- gasket (A) with notches, to use for bends;
- gasket (B) without notches, to use for extensions.
If necessary, to ease the push-fitting, spread the elements with commonly-used talc.