Technical
Manual
Room
Temperature
Controller
SCN
‐
RT1
MDT technologies GmbH •
51766 Engelskirchen • Papiermühle 1
Tel.: +49-2263-880 • Fax: +49-2263-4588 • [email protected] • www.mdt.de
47
4.5.7.3
Switchover
heating
and
cooling
By
the
setting
“heating/cooling
switch
over”
it
is
possible
to
adjust
whether
the
controller
shall
switch
automatically
or
via
communication
object.
At
the
automatic
switchover,
the
controller
evaluates
the
setpoints
and
knows
because
of
the
adjusted
setpoints
in
which
mode
the
controller
is
at
the
moment.
When
the
controller
heated
before,
the
controller
switches
over
when
the
measured
temperature
rises
over
the
adjusted
setpoint
for
cooling.
As
long
as
the
controller
is
at
the
dead
zone
between
heating
and
cooling,
the
heating
process
remains
set,
but
does
not
heat
as
long
as
the
temperature
is
above
the
adjusted
setpoint
for
heating.
By
choosing
the
switchover
via
object,
an
additional
communication
object
is
shown.
By
this
object
the
switchover
can
be
done.
The
controller
stays
as
long
at
the
adjusted
operating
mode
until
it
becomes
a
signal
via
the
according
communication
object.
As
long
as
the
controller
is
at
the
heating
mode
only
the
setpoint
for
the
heating
is
watched,
also
if
the
controller
is,
according
to
its
setpoints,
already
at
the
cooling
mode.
A
start
of
the
cooling
mode
is
also
only
possible,
when
the
controller
becomes
a
signal
via
the
communication
object.
A
“0”
switches
the
heating
process
on
and
a
“1”
switches
the
cooling
process
on.
The
following
chart
shows
the
relevant
communication
object:
Number
Name
Length
Usage
19
Heating/Cooling
switchover
1
Bit
Switchover
between
heating
and
cooling
0=heating;
1=cooling
Chart
43:
Communication
object
heating
and
cooling
