Configuration parameter
[External heat demand] function block
33
5.9
[External heat demand] function
block
Parameters to be set
Set or check the following parameters.
Explanation of [Lin y1] and [Lin y2] for external
temperature target
Optional: only for option [External temp. target]
With this option, the external heat consumer specifies
its required temperature to the heating system with an
analogue signal (0-10 V).
The [Lin y1] parameter is used to set the required
temperature for the weakest input signal and [Lin y2] is
used for the temperature for the strongest input signal.
Explanation of [Lin y1] and [Lin y2] for external
output set point
Optional: only for option [Ext. output set point].
With this option, the external heat consumer specifies
its required output to the heating system with an
analogue signal (0-10 V).
The [Lin y1] parameter is used to set the required
output for the weakest input signal and [Lin y2] is used
for the output for the strongest input signal.
Explanation of [Enable temperature]
This parameter is used to set the minimum
temperature of the heating system for starting the
charging pump of the external heat consumer.
Explanation of [Frost protection]
This parameter is used to set the freeze protection limit
for the consumer controlled with the external heat
demand.
If the outside temperature falls below this value, the
external charging pump will be turned on to protect the
consumer. It will remain in operation until the outside
temperature is at least 2 °C higher than the [Frost
protection] temperature setting.
The factory setting for the freeze protection
threshold is +5 °C outside temperature to protect
consumers at risk from freezing (such as air heaters).
If there is no freezing risk for the connected
consumers, the freeze protection limit can be set
lower.
Inputs
Required temperature
a
a. Only visible with option [External temp. target].
Lin temp.
Lin y1
Lin y2
Demanded output
b
b. Only visible with [Ext. output set point] option
Lin output
Lin y1
Lin y2
External demand
Enable temperature
Frost protection