2.3
Connection
to
Central
heating
system
In
order
to
be
able
to
operate,
the
heater
must
be
suitably
connected
to
a
heating
system.
For
this
type
of
installation
also,
some
simple
suggestions
are
provided
that
will
undoubtedly
be
helpful
when
installing
the
product
(refer
to
regulation
UNI
10412
and
following
up
‐
dating)
The
drainage
cock
is
placed
at
the
lowest
point
of
the
water
circuit.
We
recommend
to
install
the
ball
valve
on
the
delivery
water
pipe
and
on
the
return
water
pipe
(
please
refer
to
the
enclosed
schematic
drawing)
.
This
will
enable
a
quick
and
easy
maintenance
operation
in
case
of
need.
All
water
heating
installations
should
be
designed,
before
product
installation,
and
installed
by
a
competent
heating
engineer
in
accordance
with
BS
5449:
1990;
Code
of
Practice
for
Central
Heating
Systems
for
Domestic
Premises.
Further
guidance
is
available
from
the
following
sources:
BS
EN
14336:
2004
Heating
Systems
in
Buildings.
Installation
and
commissioning
of
water
based
heating
systems.
BS
EN
12828:
2003;
Heating
Systems
in
Buildings.
Design
of
water
based
heating
systems.
BS
EN
12831:
2003;
Heating
Systems
in
Buildings.
Method
for
calculation
of
the
design
heat
load.