Installation; Before You Start - Danfoss ECL Comfort 296 Operating Manual

Operating Guide ECL Comfort 210/296/310, application A230

2.0 Installation

2.1 Before you start

The application A230 is very flexible. These are the basic principles:
Heating (application A230.1):
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. The week schedule can have up to 3
'Comfort' periods / day. A value for the desired room temperature
can be set in each of the modes.
In Saving mode the heating can be reduced or switched off totally.
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
themotorized 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 (directly connected temperature
sensor ESM-10 (S2) or Remote control unit ECA 30 / 31) 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 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 this subtype is used in an ECL Comfort 296 or 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.
To compensate for the influence of wind, a wind speed sensor can
be connected. Based on the wind speed sensor signal (0 - 10 V), the
controller can be set to increase the desired flow temperature in
relation to increased wind speed.
Unused inputs can, by means of an override switch or relay contact,
be used for overriding the schedule to a fixed 'Comfort' , 'Saving' ,
'Frost protection' or 'Constant temperature' mode.
An alarm can be activated if the actual flow temperature differs
from the desired flow temperature.
6 | © Danfoss | 2017.05
Typical A230.1 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 /296/
Electronic controller ECL Comfort 210, 296 or 310
310
S1
Outdoor temperature sensor
S2
(Optional) Room temperature sensor / ECA 30
S3 Flow temperature sensor
S4 (Optional) Supply flow temperature sensor
(read-out only)
S5 (Optional) Return temperature sensor
S7
(Optional) Flow / energy meter (pulse signal)
S8
(Optional) Wind speed sensor
P1 Circulation pump, heating
M1 Motorized control valve, 3-point controlled
Alternative 1: Control valve, thermo-actuator
controlled (Danfoss type ABV)
Alternative 2 (ECL 310 with ECA 32): Motorized
control valve, 0 - 10 Volt controlled
A1
Alarm
The A230.1 application can utilize a connected flow / energy meter
to limit the flow / power.
VI.LG.H4.02