Danfoss ECL Comfort 210 Installation Manual page 9

Installation Guide
The application A275.3 is very flexible. These are the basic
principles:
Heating (circuit 2):
Typically, the flow temperature is adjusted according to your
requirements. The flow temperature sensor S4 is the most
important sensor. The desired flow temperature at S4 is calculated
in the ECL controller, based on the outdoor temperature (S1).
The lower the outdoor temperature, the higher the desired flow
temperature.
By means of a week schedule (up to 3 'Comfort' periods / day), the
heating circuit can be in 'Comfort' or 'Saving' mode (two different
temperature values for the desired room temperature). In 'Saving'
mode a 'Total stop' function can be selected in order to switch OFF
the heating.
The motorized control valve M2 is opened gradually when the flow
temperature, S4, is lower than the desired flow temperature and
vice versa.
The desired flow temperature at S4 will typically determine the
desired boiler temperature (S3).
The return temperature (S2) can be limited. If so, the desired flow
temperature at S4 can be decreased or increased.
Furthermore, the return temperature limitation can be dependent
of the outdoor temperature. Typically, the lower the outdoor
temperature, the higher the accepted return temperature.
If the measured room temperature (measured by S8 or the remote
control unit ECA 30) does not equal the desired room temperature,
the desired flow temperature can be adjusted.
The circulation pump (P4) is ON at heat demand or at frost
protection.
The heating can be switched OFF when the outdoor temperature is
higher than a selectable value or a DHW heating priority is present.
Danfoss District Energy
ECL Comfort 210 / 310, application A275 / A375
Typical A275.3 application:
S 1
S 3
S 5
B1
* 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
S2 Return temperature sensor, circuit 2
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.L1.02
ECL 210 / (310)
M2
S 4
S 8
P 4
S 2
S 7
P 1
S 6
P 3
DEN-SMT/DK 9