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15
Operating instructions
RYM
ASKON
®
600 - BACnet
RYM
ASKON
®
600 - Modbus
CHANGEOVER
Summer/winter mode
in one line
Heating/Cooling
ChangeOver
LIMIT VALUE
CONTROL
High/Low Limit Control
The main temperature control circuit of heating and cooling stages 1 can be
forcibly switched to heating or cooling mode via the bus (Changeover).
This makes it possible to use the same pipe for heating and cooling in different
seasons (summer / winter mode).
Configure and perform the switching to the following values:
• Digital input
(Digital Input Mode)
• Temperature measurement RI1
/
RI2
(RI1/RI2 Mode)
• Bus
(Changeover function)
If RI1/RI2 is selected, the system switches automatically
at the set temperature limits “Changeover High” (default: 25 °C)
and “Changeover Low” (default: 20 °C)
NOTE:
If the unit has analogue inputs
AI1
/
AI2
instead of
RI1
/
RI2
,
Changeover is only possible via the digital input or the bus.
If an
external temperature sensor
is connected (to RI1 or RI2) and
if the input is parameterised to “Floor (NTC10K)” (see chapter “Modes for
inputs RI1 and RI2”), the controller can be used for limit value control via
High Limit Setpoint
(default: 35 °C) and
Low Limit Setpoint
(default: 16 °C).
This function is enabled via the parameter “Limit Ratio”
(default: 0.0 = limit value control disabled).
For controls with the
upper limit value
(High Limit Setpoint), the target
temperature of the main control is reduced by the set value of the limit
ratio if the temperature on RI1/2 exceeds the upper limit value. Example:
If the value 2 is set for limit ratio, the target temperature is reduced by
2 degrees for every degree over the high limit setpoint.
Control using the
lower limit value
works vice versa:
For every degree that the temperature undercuts the lower setpoint,
the target temperature is increased by 2 degrees.
The value for the
target temperature reset
follows this formula:
setpoint reset = (limit setpoint - actual temperature RI1/2) × limit ratio
NOTE:
The target temperature shown on the display does not change
during these increases/decreases. The temperature limiting
icon points to an active reset phase.
NOTE:
The limit value control is enabled using the parameter “Limit Ratio”
(default: 0.0 = disabled).
NOTE:
In OFF mode, limit value control is disabled.
A
Room
20
.1
°C
21
.
5
°C
°C
°F
Fig. 4
TEMPERATURE
LIMITING
The icon shows the active
limit value control.
