User`s manual

INSTALLERUSERTECHNICIAN
55
On/Off room thermostat electrical connection.
On/Off. Connect the thermostat or On/Off Timer-
thermostat to terminals 34 and 35, eliminating jumper
P1. It must have exclusively Class II (standard EN
60335-1) electrical isolation, see the wiring diagram
on page 20. The room thermostat contact, after
connection, works at mains voltage and must be able
to commutate a minimum current of 0.8A.
Caution: Make sure the thermostat contact is of the
“clean” type, i.e. independent of the mains voltage,
otherwise the electronic adjustment board will be
damaged. Boiler pipelines must never be used to
earth the electrical or telephone lines. Ensure
elimination of this risk before making the boiler
electrical connections.
1.4 Installing air intake and flue exhaust termi-
nals.
Immergas supplies various solutions separately from
the boiler for the installation of air intake and flue
extraction, fundamental for boiler operation.
N.W.: The boiler must be installed exclusively with
an original Immergas air intake and flue extraction
system as specified by standards UNI 7129. This sys-
tem is identifiable by a special and distinctive marking.
The flue ducts have not to be near or in contact with
inflammable materials, and they have not to pass
through buildings and walls made of inflammable
materials.
The types of terminals available from Immergas com-
prise:
• Concentric horizontal intake and exhaust kit.
Installation of this kit must be in compliance with
technical standards UNI 7129, and D.P.R. 412/
93, as amended by D.P.R. 551/99 and by standards
in local building regulations and subsequent
amendments. D.P.R. 412 as amended by D.P.R.
551, restricts use of this type of system exclusively
to the following cases:
- “installation of heat generators in buildings
composed of a single unit”;
- “standard replacement of individual heat generator
appliances”.
This terminal enables air intake and exhaust of flues
directly outside the building. The horizontal kit can
be installed with a rear outlet, right-hand outlet,
POWER
CABLE
left-hand outlet and front outlet as required (see
page 8).
• Concentric vertical air intake and exhaust kit. This
terminal enables vertical air intake and flue exhaust
directly outside the building (see page 10).
• Separator kit (Ø 80/80). This kit enables air intake
to outside the building and flue exhaust via a flue
(see page 11).
The innermost duct is used for flue exhaust to the
flue and the outermost duct is used for air intake
from outside the building. Both ducts can be routed
in any direction (see page 11), except for the
insulated separator kit Ø 80/80 that with the
standard components cannot start with crossed
ducts.
• Resistance factors and equivalent lengths. Each
flue extraction system component is designed with
a resistance factor based on preliminary tests and
specified in the table below. The resistance factor
for individual components does not depend either
on the type of boiler on which it is installed or the
actual dimensions. It is based on the temperature
of fluids conveyed through the ducts and therefore
varies according to applications for air intake or
flue exhaust. Each component has a resistance
corresponding to a specific length in metres of pipe
with the same diameter; the so-called equivalent
length, based on the ratio between different resist-
ance factors, for example : Ø80 90° bend; resist-
ance factor on intake 5; 1-metre Ø80 pipe; resist-
ance factor on intake 2.3; equivalent length of 90°
Ø80 bend = 5: 2.3 = 2.2 m of Ø80 pipe on intake.
In the same way each component has a resistance
factor corresponding to a specific length in metres
of a pipe with a different diameter, for example a
concentric 90° bend Ø60/100 Resistance Factor
21; pipe Ø80 m1 on exhaust, Resistance Factor =
3; Equivalent length of 90° bend Ø60/100 = 21 : 3 =
7 m of Ø80 pipe on exhaust. All boilers have a maxi-
mum resistance factor based on testing at 100. The
maximum admissible resistance factor corresponds
to the resistance detected with the maximum ad-
missible pipe length with each type of Terminal Kit
installed. This information enables calculations to
verify the possibility of various configurations of flue
extraction systems.