Danfoss ECL Comfort 210 Operating Manual page 10

Operating Guide ECL Comfort 210/296/310, application A275/A375
The application A275.3 is very flexible. These are the basic
principles:
DHW (circuit 3):
By means of a week schedule (up to 3 'Comfort' periods / day), the
DHW circuit can be in 'Comfort' or 'Saving' mode (two different
temperature values for desired DHW temperature).
If the measured DHW temperature (S6) is lower than the desired
DHW temperature, the DHW heating procedure starts:
• The circulation pump P1 in the heating circuit is switched OFF
• The DHW heating pump P3 is switched ON
• The desired boiler temperature at S3 is increased.
The desired boiler temperature is typically 10 -15 degrees higher
than the desired DHW temperature.
When the measured DHW temperature (S6) gets higher than the
desired DHW temperature, the DHW heating pump (P3) is switched
OFF. Start and stop differences determine the ON / OFF control. A
post-run time can be set.
An anti-bacteria function is available for activation on the selected
days of the week.
The DHW heating has priority, i.e. pump P3 is ON and pump P1 is
OFF. If the application has a changeover valve (priority valve) for
the DHW heating, the circulation pump P1 is still ON during DHW
heating.
10 | © Danfoss | 2017.09
Typical A275.3 application:
* Pressure relief valve
The shown diagram is a fundamental and simplified example and does
not contain all components that are necessary in a system.
All named components are connected to the ECL Comfort controller.
List of components:
S1 Outdoor temperature sensor
Return temperature sensor, circuit 2
S2
S3
Boiler temperature sensor, circuit 1
S4
Flow temperature sensor, circuit 2
S5 Return temperature sensor, circuit 1
S6 DHW tank temperature sensor
S7 Room temperature sensor / ECA 30, circuit 1
S8 Room temperature sensor / ECA 30, circuit 2
M2
Motorized control valve, circuit 2
P1
Circulation pump, circuit 1
B1 Burner
P3 DHW heating pump, circuit 3
P4 Circulation pump, circuit 2
The controller is pre-programmed with factory settings that are shown
in the relevant chapters of this guide.
VI.GU.L2.02