Danfoss ECL Comfort 210 Installation Manual page 8

Installation Guide
The application A266.2 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).
If the measured room temperature does not equal the desired
room temperature, the desired flow temperature can be adjusted.
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.
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 A266.2 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):
The DHW temperature at S4 is maintained at 'Comfort' level at a
DHW draw-off (DHW tapping) (the flow switch (S8) is activated).
If the measured DHW temperature (S4) is lower than the desired
DHW temperature, the motorized control valve (M1) is opened
gradually and vice versa.
The DHW temperature control is in relation to actual supply
temperature (S6). In order to compensate for the reaction time, the
motorized control valve can be pre-activated at the start of a DHW
draw-off (DHW tapping). An idle temperature can be maintained at
either S6 or S4 when there is no draw-off (DHW tapping).
The return temperature (S5) can be limited 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).
8 DEN-SMT/DK
ECL Comfort 210 / 310, application A266
Typical A266.2 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) Room temperature sensor
S3 Flow temperature sensor, circuit 1
S4 DHW flow temperature sensor, circuit 2
S5 (Optional) Return temperature sensor, circuit 1, circuit
2 or both circuits
S6 (Optional) Supply temperature sensor, circuit 2
S7 (Optional) Flow / energy meter (pulse signal)
S8 Flow switch, DHW draw-off, circuit 2
P1
Circulation pump, DHW, circuit 2
P2
Circulation pump, heating, circuit 1
M1 Motorized control valve (3-point controlled), circuit 2
Alternative: Thermo actuator (Danfoss type ABV
M2
Motorized control valve (3-point controlled), circuit 1
Alternative: Thermo actuator (Danfoss type ABV
A1 Alarm
VI.KT.X3.02
Danfoss District Energy