Danfoss ECL Comfort 296 Operating Manual page 7

Operating Guide ECL Comfort 210/296/310, application A230
Cooling (application A230.2):
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 set in the
ECL controller. Furthermore, the outdoor temperature (S1) can
influence the desired flow temperature. The higher the outdoor
temperature, the lower the desired flow temperature.
By means of the week schedule, the cooling circuit can be in
'Comfort' or 'Saving' mode (two values for the desired flow
temperature).
The week schedule also controls two values ('Comfort' and
'Saving') for the desired room temperature. If the measured room
temperature does not equal the desired room temperature, the
desired flow temperature can be adjusted.
The motorized control valve M1 is opened gradually when the
flow temperature is higher than the desired flow temperature and
vice versa.
The return temperature S5 to the cooling supply should not be too
low. If so, the desired flow temperature can be adjusted (typically to
a higher value), thus resulting in a gradual closing of the motorized
control valve.
The circulation pump, P1, is ON at cooling demand.
An external signal for the desired flow temperature can be applied
as a 0–10 volt signal to the terminals for S8.
A connected flow or energy meter based on pulses (S7) can limit
the flow or energy to a set maximum value.
When the A230.2 is used in an ECL Comfort 296 / 310 the flow /
energy signal can alternatively come as an M-bus signal.
The standby mode maintains a selectable flow temperature, for
example 30 °C.
The temperatures S4 and S6 are used for monitoring purposes only.
The schedule in "Common controller settings" controls the relays
2 and 3. This can be utilized for shifting between two circulation
pumps.
See the installation guide, appl. A230.2, ex. d and related electrical
connections.
Heating (A230.4)
This subtype works as subtype A230.1, but the wind influence
functionality is not implemented.
In addition, A230.4 can monitor DHW (Domestic Hot Water)
temperatures S4 and S6.
An applied voltage signal (0 - 10 Volt) to S8 can be used for:
• pressure measuring. The voltage is converted in the ECL
controller to a pressure, measured in bar
or
• setting the desired flow temperature. The voltage is converted
in the ECL controller to a temperature value.
VI.LG.H4.02
Typical A230.2 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 / 296 Electronic controller ECL Comfort 210, 296 or 310
/310
S1 (Optional) Outdoor temperature sensor
S2 (Optional) Room temperature sensor / ECA 30
S3 Flow temperature sensor, cooling
S4
(Optional) Supply flow temperature sensor (read-out
only)
S5 (Optional) Return temperature sensor
S6 (Optional) Return temperature sensor (read-out only)
S7 (Optional) Flow / energy meter (pulse signal), not
illustrated
(S8)
(Optional) (External voltage (0–10 V) for external
setting of desired flow temperature)
P1 Circulation pump, cooling
P2 / P3 Schedule 2
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
The A230.2 application can utilize a connected flow / energy meter
to limit the flow / power.
© Danfoss | 2017.05 | 7