Guidelines When Connecting The Electrical Wiring - Daikin D2C18ND024A5AA Installation Manual

▪ The maximum pressure in the domestic hot water circuit is 10 bar.
Inspect the piping taking this in to consideration. If the water
pressure of the main water supply is excessive, use an
appropriate pressure reducer. Installation must comply with
EN 15502-2-2.
▪ As the condensing boilers generate condensate, the condensate
trap outlet should be connected to an open drain. Piping and
elements of the drain line must be made of acid-resistant material
like plastics. Metals like steel or copper are not allowed.
▪ The system must be air-free to protect the boiler. There are two
automatic air vents on the boiler, one at heat exchanger, the other
on the pump. Ensure air is discharged completely at each water
filling. Bleed the radiators if necessary.
▪ If the boiler will be connected to an old central heating/domestic
hot water installation, then first visually inspect the old installation.
The installation must be in compliance with the capacity of the
boiler and must not prevent the efficient running of it. Dirt in old
system and piping must be flushed, and filters must be inspected.
▪ 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.
D2C18ND024A5AA + D2HND012/18A5AA
Wall-mounted condensing boiler
3P469346-9J – 2018.05
Cat. III
a b
1~ 230 V
50 Hz
▪ 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.
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 Installation
Installation manual
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