page no. 21 of 28
PZN Aquamatic Water Heater
Doc Ref M107 issue 1.3 Sep 2018.
Warning: THIS APPLIANCE MUST BE
EARTHED.
Warning: Wiring external to the unit must be
carried out by an appropriately qualified
person to current IEE regulations for
Electrical Installations and any local regulations which
apply.
The local electrical supply must be run to a point adjacent
to the heater and be suitably terminated to provide an
isolation point that will prevent remote activation of
the unit during servicing. Wiring should be completed in
flexible conduit.
The local electrical supply conditions must be compatible
with the electrical data given on the appliance data plate.
Units for use with either 230V, 1N, 50Hz or 400V, 3N,
50Hz supplies. (see section 1.2 for details)
The method of connection to the main electricity supply
must:-
- facilitate the complete electrical isolation of the unit(s)
via a suitable fused isolator that will prevent remote
activation of the unit during servicing (see section 1.2 for
ratings).
- be in a readily accessible position adjacent to the
heater(s).
- serve only the units(s).
- have a contact separation of at least 3mm in all poles.
See section 2.5 or the accompanying wiring diagram for
the heater electrical connections.
Reference must be made to Section 1.2 to ascertain the
electrical loading of the unit(s) being installed so that
cables of adequate cross-sectional area are used for
the electrical installation. The length of the conductors
between the cord anchorage and the terminals must be
such that the current carrying conductors become taut
before the earth conductor if the cable or cord slips out
of the cord anchorage. All external controls must be of an
approved type.
All units are fully pre-wired and only require final
connections for the incoming mains supply and any
controlling circuits such as on-off switches, room
thermostats, three position speed controls etc.
Notes:
• Install upstream of the unit a differential magneto
thermal circuit breaker suitably sized according to the
regulations in force.
• Always connect the earthing system, taking care to
leave the earth wire slightly longer that the other wires,
so that, in case of accidental pulling, the latter is the last
one to be removed.
• Get qualified personnel to check that the section of
the cables and the electrical system are suitable for the
maximum power absorbed by the unit indicated on the
information plate.
• Respect polarity in the connection of the power supply
(phase - neutral).
• The unit must be connected to an efficient earthing
system. The manufacturer shall not be held responsible
for any damage caused by failure to earth the appliance.
• The electrical cables must be positioned so as not to
come into contact with hot and/or cold surfaces, or with
sharp edges.
• In accordance with the Standards regarding the
installation of electrical components, a device that
ensures disconnection from the mains with an opening
distance between contacts that guarantees complete
disconnection in overvoltage conditions III (Standard EN
60335-1) must be included.
• Water or gas pipes should not be used as earth
connection of the machine.
• It is compulsory to use systems that, in the event of a
fan heater breakdown, isolate the faulty unit only without
compromising the routine operation of any other units
making up the overall system.
• In the types with two electric fans (PZN 82 - 93)
to activate it is possible to feed the two assemblies
separately