Danfoss ECL Comfort 210 Installation Manual page 8

Installation Guide
The two applications, A237.2 / A337.2 are almost identical.
However, A337.2 has some extra functions which are described
additionally.
The applications A237.2 / A337.2 are 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).
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 desired room temperature).
The motorized control valve M1 is opened gradually when the
flow temperature is lower than the desired flow temperature and
vice versa.
The return temperature (S5) to the district heating supply should
not be too high. If so, the desired flow temperature can be adjusted
(typically to a lower value), thus resulting in a gradual closing of the
motorized control valve.
In boiler-based heating supply the return temperature should not
be too low (same adjustment procedure as above).
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 does not equal the desired
room temperature, the desired flow temperature can be adjusted.
The circulation pump (P1) is ON at heat demand or at frost
protection. The circulation pump (P1) is switched OFF when
heating the DHW. If the system has a changeover valve (P2 / M2)
between the heating and DHW circuit, the circulation pump (P1)
is ON when heating the DHW.
The heating can be switched OFF when the outdoor temperature is
higher than a selectable value.
8 DEN-SMT/DK
ECL Comfort 210 / 310, application A237 / A337
Typical A237.2 / A337.2 application:
P 1
M1
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 Room temperature sensor
S3
Flow temperature sensor, circuit 1
S5 Return temperature sensor, circuit 1
S6
DHW tank temperature sensor, upper
S8 DHW tank temperature sensor, lower
P1 Circulation pump, heating, circuit 1
P2 DHW pump, circuit 2
P3 DHW circulation pump, circuit 2
P4
DHW charging pump, circuit 2
M1
Motorized control valve
(R6)
Relay output, alarm, ECL Comfort 310
VI.LG.R1.02
S 6
P 2
S 8
P 3
P 4
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