Installation; Before You Start - Danfoss ECL Comfort 310 Operating Manual

Operating Guide ECL Comfort 310, application A377

2.0 Installation

2.1 Before you start

The applications (subtypes) in the A377 application key are very
flexible and almost identical.
However, some applications have extra functions which are
described separately.
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 can be in 'Comfort' or 'Saving' mode (two different
temperature 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) 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 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 (Remote control unit ECA 30 /
31) 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 M-bus signal 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.
The desired flow temperature of heating circuit 1 can, via S7, be
controlled by means of an external voltage in the range 0-10 volt.
The frost protection mode maintains a selectable flow temperature,
for example 10 °C.
An alarm can be activated if the actual flow temperature differs
from the desired flow temperature.
The room temperature signal can be achieved from the Remote
Control Unit ECA 30 / 31, if connected.
A377.2:
When both DHW heating / charging and heating circuit 1 are
active, the circulation pump in the heating circuit can continue
operating. The heating circuit temperature is typically increased.
This is parallel mode. If the increase of the flow temperature
cannot be accepted, the circulation pump in heating circuit can be
stopped. This is DHW priority mode.
6 | © Danfoss | 2017.10
Typical A377.1 application, example a:
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 310 Electronic controller ECL Comfort 310
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) (External temperature control, not illustrated)
S8 DHW tank temperature sensor, lower
S9 DHW flow temperature sensor, circuit 3
S10 Return temperature sensor, circuit 3
M1 Motorized control valve (3-point controlled), circuit 3
Alternative: Thermo actuator (Danfoss type ABV)
M2 Motorized control valve (3-point controlled), circuit 1
Alternative: Thermo actuator (Danfoss type ABV)
M3 Motorized control valve (3-point controlled), circuit 2
Alternative: Thermo actuator (Danfoss type ABV)
P1 DHW heating pump (not illustrated)
P2 Circulation pump, heating, circuit 1
P3 DHW circulation pump
P4 DHW charging pump
P5 Circulation pump, heating, circuit 2
A1 Alarm
A / B Internal / external connections for DHW circulation
VI.GU.F6.02