Danfoss ECL Comfort C25, User Manual

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Sketch your application
The ECL Comfort controller series is designed for a wide
range of heating, hot-water and cooling systems with
different configurations and capacities.
If your system differs from the diagrams shown in section
10, you may want to make a sketch of the system about to
be installed. This makes it easier to use the Installer’s Guide,
which will guide you step-by-step from installation to final
adjustments before the end-user takes over.
The controller is pre-programmed with factory settings that are
shown in the relevant sections of this guide.
However, you might come across some settings that are not listed
in this instruction. These settings could be related either to recent
updates or the use of optional modules (which are described in
the instructions in question).
How to use this guide
This guide is divided into two parts:
• User’s Guide: Yellow sections 1-7
• Installer's Guide: Grey sections 10 and onwards
The application
C25
is very flexible. These are the basic
principles:
Heating
:
Typically, the flow temperature is always adjusted according to
your requirements.
The flow temperature sensor (S5) is the most important sensor.
The desired flow temperature at S5 is calculated in the ECL
controller based on the outdoor temperature (S1). The lower the
outdoor temperature, the higher the desired flow temperature.
The boiler is switched ON when the flow temperature is lower
than the desired flow temperature and vice versa. A switching
difference determines the action.
The return temperature (S4) to the boiler should not be too low.
If so, the desired flow temperature can be adjusted, typically to a
higher value.
If the measured room temperature does not equal the desired
room temperature, the desired flow temperature can be adjusted.
DHW
:
If the measured DHW temperature is lower than the desired DHW
temperature, the desired flow temperature at S5 is increased in
order to heat the DHW. DHW heating has priority, i.e. pump P2 is
ON and pump P1 is OFF (or changeover valve is activated and P1
is still ON).
Before you start