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3 7 Electrical connections
Before connecting the boiler to its electrical power supply,
it is recommended:
- install a thermal magnetic circuit breaker In=10 A
Idn= 0.03 mA along the boiler's electrical power line.
b
The electrical power cables and control cables (am-
bient thermostat, external temperature probes, etc.)
must be rigorously separated from one another, and
installed inside independent sections of corrugated
PVC piping, all the way up to the electrical panel (see
the installation template).
b
The connection to the electrical power supply must
be performed using type 1 sheathed cables (3 x
1.5) N1VVK or equivalent, while simple N07VK type
or equivalent conductors can be used for the ther-
moregulation and low voltage circuits.
b
If the electrical power provided by the electrical com-
pany is of a "
PHASE-PHASE
" connection type, pre-
ventively contact the nearest Technical Assistance
Centre.
b
Never shut the boiler off during its normal functional-
ity (with the burner on) by shutting off the electrical
power supply using the on-off button or an external
switch.
This could cause the primary heat exchanger to
overheat
b
During heating phases, shutdowns must be per-
formed using an ambient thermostat, or else the ap-
propriate summer/winter button on the control panel.
The on-off button can only be used with the boiler in
standby mode (the screen displays a 0 followed by a
temperature value), or else in emergency mode.
- Arrange the electrical conductors and their rela-
tive containment pipes according to the indications
shown in the electrical diagram (based on the boil-
er model to be installed), which can be found in the
technical data sheets contained in this manual. The
connection to the mains supply must be made via a
separation device with an omnipolar opening of at
least 3.5mm (EN 60335-1, category III).
Before connecting any external electrical components
to the boiler (regulators, electric valves, climate control
probes, etc.), check to make sure that their electrical char-
acteristics are compatible with the available inputs and out-
puts (voltage, absorption, acceleration current).
3 7 1 Grounding system
Always check the proper functionality of the "grounding
conductor" for the electrical system to which the boiler will
be connected. In fact, if it is not functioning properly, the
boiler could go into safety lockout mode, and premature
corrosion could take place on the storage tank.
3 7 2 Connection to the electrical power
supply
Connect the boiler to a single-phase 230 V-50 Hz electrical
power line using the appropriate power cable (see chapter
The electrical panel contains the terminal board for the
auxiliary devices (ambient thermostat, external probe) that
correspond to each connection.
Particular caution must be taken to avoid inverting the
Phase and Neutral wires.
Also make sure that the power cables are separated from
the control cables using sections of corrugated PVC pip-
ing.
It should also be noted that the grounding connection must
be performed in accordance with the provisions of Italian
Law 46/90.
b
Vokera
the manufacturer shall bear no responsibility
for any personal injuries or property damage caused
by the electrical system's incorrect or lack of connec-
tion to the grounding system, or by the failure to re-
spect the current applicable CEI standards.
3 8 Gas connections
The gas connection must be made respecting the instal-
lation regulations in force, and sized to ensure the correct
gas delivery to the burner.
Before making the connection, check that:
- the gas type is suitable for the appliance
- the piping is thoroughly clean
- the gas meter's flow rate is capable of ensuring the
simultaneous use of all the appliances connected to
it. The boiler's connection to the gas supply line must
be carried out in accordance with the current regu-
lations.
- the intake pressure with the boiler off has the follow-
ing reference values:
- powered by methane gas: optimal pressure 20
mbar
- powered by L.P.G.: optimal pressure 35 mbar
While it is normal for the intake pressure to decrease while
the boiler is in function, it is recommended to verify that no
excessive pressure fluctuations take place. In order to limit
the extent of these types of variations, the diameter of the
gas supply line to be utilized must be evaluated based on
the length and the pressure drops of the line itself, from the
meter to the boiler.
If fluctuations in the gas distribution pressure are encoun-
tered, it is recommended to install an appropriate pressure
stabilizer upstream of the boiler's gas intake. For L.P.G. gas
supplies, all the necessary precautions must be taken in
order to prevent the gas from freezing in the case of ex-
tremely low external temperatures.
If the boiler needs to be adapted for use with another gas
fuel, contact your local Technical Assistance Centre to have
the necessary modifications made. These operations may
not be performed by the installer under any circumstances.
It is advisable to install a filter of suitable dimensions on the
gas line if the distribution network contains solid particles.
Once the appliance has been installed, check the connec-
tions are sealed according to current installation regula-
tions.
