4. Usage
9.05) Max Allowed Duration For Min Compressor Speed
When
unit
output
is
higher
than
demand
,
compressor
speed
will
be
reduced
.
If compressor has
continuously worked in minimum compressor speed for over time set via
“
Max Allowed Duration For
Min Compressor Speed
”,
unit
stops
.
9.06) Cooling and Heating Switch
This
function
is
for
having
the
unit
start
cooling
or
heating
operation
automatically
,
according
to
:
◆
If setting =
“
Ambient Temp
”,
system
will
automatically
choose
cooling
or
heating
operation
based
on
the
outdoor
ambient
temperature
,
compared
with
parameter
set
in 9.07
and 9.08
.
◆
If setting =
“
External Signal Control
”,
an
external
room
thermostat
or
central
control
system
in
the
building
can
control
the
cooling
or
heating
requirements
by
connecting
it
to
the
respective
signal
ports
.
The
signals
are
simple 1-0
(
on
-
off
)
signal
.
If
cooling
port
receives
the
signal
,
the
system
switches
to
cooling
;
If
heating
port
receives
the
signal
,
the
system
switches
to
heating
.
When
neither
port
receives
the
signal
,
the
system
stays
in
standby
mode
.
◆
If setting =
“
Ambient Temp.+External Signal Control
”,
unit
will
take
both
the
ambient
temperature
and
external
signal
into
consideration
for
cooling
or
heating
mode
selection
.
Note:
If parameter is set to OFF, auto switch function is not activated. Then make sure that parameter
(Heating Water Circuit) and (Cooling Water Circuit) are not set to ON simultaneously, as the system
can not determine actual requirement, due to mode conflict.
To
avoid
mode
conflict
,
if
“
External Signal Control
”
is used to take control, please ensure that
the external signal will not be activated at the cooling and heating ports at the same time.
9.07) Ambient Temp. To Start Heating
This
parameter
is
used
to
set
the
ambient
temperature
to
start
the
heating
operation
.
For
example
,
if
default
value
is 18
℃,
the
system
will
start
heating
operation
automatically
when
ambient
temperature
is
lower
than 18
℃.
The
setting
is
only
available
when
parameter
“
Cooling and Heating Switch
“
=” Ambient Temp.
“
Or
“
Ambient Temp.+External Signal Control
”.
9.08) Ambient Temp. To Start Cooling
This
parameter
is
used
to
set
the
ambient
temperature
to
start
the
cooling
operation
.
For
example
,
if
set
value
is 28
℃,
the
system
will
start
heating
operation
automatically
when
ambient
temperature
is
higher
than 28
℃.
The setting is only available when parameter
“
Cooling and Heating Switch “=”Ambient Temp.
Or
“
Ambient Temp.+External Signal Control
”.
Note
:
In
order
to
avoid
short
cycling
between
different
modes
,
unit
will
also
take
the
average
temperature
in
the
past
time
for
reference
of
choosing
the
working
mode
.
9
93
