Installation - Danfoss ECL Comfort 296 Operating Manual

Operating Guide ECL Comfort 210 / 296, application A267

2.0 Installation

2.1 Before you start
The application A267 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).
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 1 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.
Furthermore, the return temperature limitation can depend
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 (S7) 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) can be switched OFF
when heating the DHW (dependent priority). If the system has
a changeover valve (P2) between the heating and DHW heating
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.
VI.GU.G2.02
Typical A267 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:
S1 Outdoor temperature sensor
S2 Return temperature sensor, circuit 2
S3 Flow temperature sensor, circuit 1
S4
Flow temperature sensor, circuit 2
S5 Return temperature sensor, circuit 1
S6 DHW tank temperature sensor, upper
S7 Room temperature sensor, circuits 1 and 2
S8 DHW tank temperature sensor, lower
P1
Circulation pump, heating, circuit 1
P2
DHW heating pump, circuit 3
P3
DHW circulation pump, circuit 3
P4 Circulation pump, heating, circuit 2
M1 Motorized control valve, circuits 1 and 3
M2 Motorized control valve, circuit 2
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