Control Parameters - Danfoss ECL Comfort 296 Operating Manual

Operating Guide ECL Comfort 210/296/310, application A230

5.8 Control parameters

Control of valve
The motorized control valve is controlled by means of 3-point
control or a 0 - 10 volt control signal.
Valve control (heating):
The motorized control valve is opened gradually when the flow
temperature is lower than the desired flow temperature and vice
versa.
Valve control (cooling):
The motorized control valve is operated oppositely in relation to
heating application.
The following explanations for actuator types are related to heating
applications.
3-point controlled actuator:
The electric actuator contains a reversible gear-motor. Electric
"open" and "close" signals come from the electronic outputs of the
ECL Comfort controller in order to manage the control valve. The
signals are in the ECL Comfort controller expressed as "Arrow-up"
(open) and "Arrow-down" (close) and displayed at the valve symbol.
When the flow temperature (for example at S3) is lower than the
desired flow temperature, short open-signals come from the ECL
Comfort controller in order to gradually increase the flow. By this,
the flow temperature will align with the desired temperature.
Oppositely, when the flow temperature is higher than the desired
flow temperature, short close-signals come from the ECL Comfort
controller in order to gradually reduce the flow. Again, the flow
temperature aligns with the desired temperature.
Neither open-signals nor close-signals will come as long as the flow
temperature corresponds to the desired temperature.
0 - 10 volt controlled actuator
This electric actuator contains a reversible gear-motor. A control
voltage between 0 and 10 volt comes from the extension module
ECA 32 in order to manage the control valve. The voltage in the ECL
Comfort controller is expressed as a % value and displayed at the
valve symbol. Example: 45 % corresponds to 4.5 volt.
When the flow temperature (for example at S3) is lower than
the desired flow temperature, the control voltage is gradually
increased in order to gradually increase the flow. By this, the flow
temperature will align with the desired temperature.
The control voltage remains on a constant value as long as the flow
temperature corresponds to the desired temperature.
Oppositely, when the flow temperature is higher than the desired
flow temperature, the control voltage is gradually reduced in order
to reduce the flow. Again, the flow temperature aligns with the
desired temperature.
90 | © Danfoss | 2017.05
VI.LG.H4.02