Danfoss ECL Comfort 210 Installation Manual page 12

Installation Guide
The application A266.10 is very flexible. These are the basic
principles:
Heating (circuit 1):
Typically, the flow temperature is adjusted according to your
requirements. The flow temperature sensor (S3) is the most
important sensor. The desired flow temperature at S3 is calculated
in the ECL controller, based on the outdoor temperature (S1) and
the desired room temperature. The lower the outdoor temperature,
the higher the desired flow temperature.
By means of a week schedule, the heating circuit can be in 'Comfort'
or 'Saving' mode (two values for the desired room temperature).
In Saving mode the heating can be reduced or switched off totally.
The motorized control valve (M2) is opened gradually when the
flow temperature is lower than the desired flow temperature and
vice versa.
The return temperature (S5) can be limited, for example not to be
too high. If so, the desired flow temperature at S3 can be adjusted
(typically to a lower value), thus resulting in a gradual closing of
the motorized control valve. Furthermore, the return temperature
limitation can be dependent on the outdoor temperature.
Typically, the lower the outdoor temperature, the higher the
accepted return temperature.
In boiler-based heating supply the return temperature should not
be too low (same adjustment procedure as above).
The circulation pump, P2, 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.
The secondary return temperature (S2) is used for monitoring.
A connected flow or energy meter based on pulses (S7) can limit the
flow or energy to a set maximum value. Furthermore the limitation
can be in relation to the outdoor temperature. Typically, the lower
the outdoor temperature, the higher the accepted flow / power.
When the A266.10 is used in an ECL Comfort 310 the flow / energy
signal can alternatively come as an M-bus signal.
The frost protection mode maintains a selectable flow temperature,
for example 10 °C.
DHW (circuit 2):
If the measured DHW temperature (S4) is lower than the desired
DHW temperature, the motorized control valve (M1) is opened
gradually and vice versa. If the desired DHW temperature cannot
be reached, the heating circuit can be closed gradually to allow
more energy to the DHW circuit.
The return temperature S6 can measure, for monitoring purpose,
the return temperature on the secondary side. An alternative
position for S6 can be in the return on the primary side in order to
limit the return temperature to a fixed value.
By means of a week schedule, the DHW circuit can be in 'Comfort'
or 'Saving' mode (two values for the desired DHW temperature).
12 DEN-SMT/DK
ECL Comfort 210 / 310, application A266
Typical A266.10 application:
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:
ECL 210 / 310 Electronic controller ECL Comfort 210 or 310
S1 Outdoor temperature sensor
S2 (Optional) Return temperature sensor, circuit 1, for
monitoring
S3 Flow temperature sensor, circuit 1
S4
DHW flow temperature sensor, circuit 2
S5
(Optional) Return temperature sensor, circuit 1
S6 (Optional) Return temperature sensor, secondary side,
circuit 2. Alternative position: Return, primary side
S7
(Optional) Flow / energy meter (pulse signal)
S8
(Optional) Alarm input
P1 Circulation pump, DHW, circuit 2
P2 Circulation pump, heating, circuit 1
M1 Motorized control valve, circuit 2
M2
Motorized control valve, circuit 1
A1
Alarm
VI.KT.X3.02
Danfoss District Energy