Specifications
Control 40
Regular Checks
Checking the Water Level of the Heating System
The
pr
essur
e
of
the
heating
system
should
be
checked
once
monthly
.
The
pr
essu
r
e,
shown
on
the
external
pr
essur
e
gauge,
should
be
1-1,5
bar
.
If
the
value
is
below
0.8
bar
with
cold
water
in
the
heating
system,
mor
e
water
must
be
added
(applies
to
a
closed
expansion
vessel).
T
o
find
out
wher
e
the
pr
essur
e
gauge
is
located.
Y
ou
can
use
or
dinary
tap
water
for
filling
the
heating
system.
In
some
rar
e
cases the
water
quality
would
be
unsuitable
for
this
purpose
(corr
osive
or
calcar
eous
water).
In
case
of
doubt,
we
would
r
ecommend
that
you
call
your
installation
contractor
.
Don’t
use
any
water
tr
eatment
additives
for
the
heating
system!
Checking the Safety Valves
Both
safety
valves
of
the
heating
system
should
be
checked
at
least
four
times
a
year
to
pr
event
lime
deposits
to
clog
the
mechanism.
T
o
find
out
wher
e
the
safety
valves
ar
e
located
.
The
safety
valve
of
the
water
heater
protects
the
closed
heater
against
positive
pr
essur
e.
It
is
fitted
on
the
cold
water
inlet
line,
its
outlet
opening
facing
down
-
war
ds.
If
the
safety
valve
is
not
checked
r
egularly
,
the
water
heater
might
be
damaged.
It
is
quite
normal
that
the
safety
valve
lets
out
small
amounts
of
water
when
the
water
heater
is
being
char
ged,
especially
if
a
lot
of
warm
water
was
used
pr
eviously
.
T
o
check
the
safety
valves,
give
the
cap
a
quar
ter
of
a
turn
clockwise
until
the
valve
lets
out
some
water
thr
ough
the
overflow
pipe.
If
a
safety
valve
does
not
work
pr
operly
,
it
must
be
r
eplaced.
Check
with
your
installation
contractor
.
The
opening
pr
essur
e
of
the
safety
valve
is
not
adjustable.
In the Event of Lea
kage
In
the
event
of
leakage
in
the
warm
water
lines
between
unit
and
water
taps,
the
shut-of
f
valve
on
the
cold
water
inlet
line
should
be
closed
immediately
.
Call
your
installation
contractor
.
In
the
event
of
leakage
in
the
system
cir
cuit,
turn
of
f
the
heat
pump
and
call
your
installation
contractor
immediately
.