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4 Installation
▪ If old piping material does not have oxygen barrier, then it must be
separated from the boiler circuit via a plate heat exchanger and a
second pump has to be installed for necessary circulation.
▪ If the pressure reading on the boiler user interface is dropping
repeatedly, most probably there is a leakage in the installation.
Inspect the installation to repair.
▪ In case of solar preheating of the domestic hot water from a solar
tank, install the thermostatic mixing valve at the domestic hot
water outlet and inlet.
4.8.4
Guidelines when connecting the electrical
wiring
DANGER
Before working on the electrical circuit always isolate the
unit from the power mains.
WARNING
Only qualified persons are allowed to make electrical
connections on the unit. Failure to observe this warning will
void the warranty. The manufacturer is not responsible for
any damage that may occur this way.
WARNING
Use a dedicated power circuit. Never use a power supply
cable shared by another unit.
The unit runs on 230 V AC 50 Hz power. A power cable is delivered
with the package. The power cable must be connected to the power
supply by an electrician and in accordance with the applicable
legislation.
3×0.75 TTR / 230 V
H05RN
a
Safety breaker (2 A)
b
Earth leakage safety breaker
Cat. III
Overvoltage category III
▪ Electrical work should be carried out in accordance with the
installation manual and the national electrical wiring rules or code
of practice.
▪ Insufficient capacity or incomplete electrical work may cause
electrical shock or fire.
▪ A main switch or other means for disconnection, having a contact
separation in all poles providing full disconnection under
overvoltage category III, shall be installed in the fixed wiring.
▪ Be sure to establish an earth. Do not earth the unit to a utility pipe,
lightning arrester, or telephone earth. Incomplete earth may
cause electrical shock and fire.
▪ While the electrical connections are being done, energy should
not be on the main power supply cable and the main switch
should be closed.
▪ During the electrical connections, make sure that the cables are
well-fixed and are connected firmly and tightly.
▪ Power supply cable must be equivalent to H05RN-F (2451EC57)
as minimum requirement.
Observe the point mentioned below when wiring to the power supply
terminal board.
Installation manual
14
Cat. III
a
b
1~ 230 V
50 Hz
a
L
N
a<b
b
WARNING
Do not interchange the supply conductors L and the
neutral conductor N.
DANGER
Do not use gas and water pipes for earthing purposes and
ensure that they have not been used for this purpose
before. Failure to observe this relieves the manufacturer of
any responsibility.
4.8.5
Guidelines when connecting options to
the boiler
Optional equipment is connected to the connectors, which are
located on the outside of the switch box. Do not open the switch box
to connect optional equipment.
Temperature control units
Solar NTC sensor
Opentherm room thermostat
Outdoor sensor
Domestic hot water storage tank
sensor
External power output (230 V AC)
On-Off room thermostat
Solar stop contact
1
X2M
8
Wiring of the options that are to be connected to the X2M connector
must pop out from the inside of the unit via cable glands. Cable
glands that are sent with the unit must be assembled to the bottom
sheet of the boiler in case connection of these options. Below, you
can see the cable glands placement.
D2CND028+035A1/4AA + D2TND028+035A4AA
Connector
Connection
X1M
1-2
X1M
3-4
X1M
5-6
X1M
7-8
X2M
3-4
X2M
5-6
X2M
7-8
Wall-mounted condensing boiler
3P469346-5E – 2017.06
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