Danfoss ECL Comfort 210 Installation Manual page 8

Installation Guide
The application A331.1 is very flexible. These are the basic
principles:
Heating:
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, the heating circuit can be in
'Comfort' or 'Saving' mode (two different temperature values for
desired room temperature).
The motorized control valves 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.
The circulation pump in question 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 static pressure on the secondary side (consumer side) can 1) be
measured as a 0 - 10 V signal (from a pressure transmitter) or 2) be a
switch signal from a pressure switch. In case of a too low pressure,
the refill water function will supplement with water from the
supply side. The two refill water pumps are operated alternately.
When the ECL Comfort controller operates as a slave, only the refill
water valve is controlled. The master controls a common refill
water pump for the entire system.
8 DEN-SMT/DK
ECL Comfort 210 / 310, application A231 / A331
Typical A331.1 application:
S 1 ECL 310
S 10
M1 S 5
P 3
P 5
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
S3 Flow temperature sensor
S5 Return temperature sensor
S7
Differential pressure switch
S8
Pressure transmitter or pressure switch
S9
Alarm input
S10
Pressure transmitter (for monitoring only)
P1 Circulation pump
P2 Circulation pump
P3
Refill water pump
P5
Refill water pump
M1
Motorized control valve
V1
Solenoid valve, refill water valve
R6 Relay output, alarm
VI.LG.P1.02
R6
S 9
P S 7
P 1
S 3
P 2
S 8
V1
Danfoss District Energy