4. Electrical connection
4.1. Important considerations
IMPORTANT
➢ The system must be fitted with a switch which
has an opening of 3 mm between contacts. The
circuit must be protected by fuses or switches
which are calibrated according to the power of the
water heater.
➢ The electric water heater must be connected
in accordance with European regulations and
the connections must always conform to current
national legislation. The line must be protected by
a 30 mA differential switch.
➢ The electrical connection of a fixed appliance
should be performed using a suitable rigid wire
with an appropriate cross-section and a green/
yellow earth wire: please consult current national
legislation relating to electrical systems (the
minimum requirement will be 3 x 2.5 mm² single-
phase and 4 x 2.5 mm² three-phase for a power
level of up to 3000 W).
CAUTION: the appliance MUST be earthed! Do
not use piping for an earth connection.
THE WIRING DIAGRAM IS STUK
ONTO THE APPLIANCE: USE IT AS A
REFERENCE GUIDE.
4.2. VERT, HORD, HORB three-phase vertical
model, MT version
Three-phase vertical appliances are already wired
at 400 V THREE-PHASE when they are shipped.
They may be connected at 230 V Three-phase or
230 V SINGLE-PHASE.
4.3. STAB MT stable model
The 200-250 & 300 litre stable models are
already wired in 230 V single-phase when they
are shipped. They may be wired at 230 V THREE-
PHASE or 400 V THREE-PHASE.
The 500 litre stable model is wired at 400 V
three-phase at the company.
Electrical connection of the appliance should
only be performed using the thermostat
terminals or the terminal board of the
appliance.
ANY DIRECT CONNECTION TO THE
HEATING ELEMENT IS HAZARDOUS
ANS IS STRICTLY PROHIBITED.
4.4. PROfessional TECH (PTEC)
The boiler protection anode is controlled by a
P.C.B. powered at the network current or using a
battery designed for systems operating in day/night
mode, in order to keep the boiler protected during
the day. Correct operation of the protection system
REQUIRES A PERMANENT POWER SUPPLY
(network or batteries). The appliance cannot, in
fact, be left without a power supply for more than
48 hours.
Night-time power supply + batteries
➢ Heating element Night-time power supply
(exclusive or dual timer schedule) (Picture 13).
➢ PROfessional TECH Operation with
batteries.*
* Electric water heaters, designed for a night-time
power supply, are fitted with Ni-Mh batteries which
are charged every night, thereby protecting the
boiler during the day.
CAUTION:
The batteries do not have an indefinite lifespan: it
makes good sense to replace them once they have
been used for one or two years.
In order to guarantee full boiler protection,
any faulty batteries must be replaced. If the
batteries are not replaced, the guarantee will
become void.
Picture 13 – PROfessional TECH Night-time
power supply + batteries
Permanent power supply
➢ Heating element and PROfessional TECH
Continuous power supply (Picture 14).
➢ Operation without battery.
Picture 14 – PROfessional TECH Permanent power
supply
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