Operating Modes - Danfoss ECL 2000 User Manual

2. INTRODUCING THE ECL 2000
2.1 What is the ECL 2000?
2.2

Operating Modes

The ECL 2000 is a micro-processor based controller used for temperature control and
regulation in district heating systems and for mixing control in boiler systems.
The controller can be used for weather compensation and control in the following
types of systems:
•
Two parallel district heating circuits
•
Two heat circuits and one hot-water circuit
•
Two separate weather compensated heat circuits
•
Two heat circuits combined with hot-water tank control.
Two types of ECL 2000 are available with different input/output configurations.
ECL 2000 Type 1 is supplied with 14 pre-programmed applications (i.e. 14 standard
system setups). Type 2 has 17 pre-programmed applications. The ECL 2000's built-in
applications cover a wide variety of commonly used central heating configurations.
See page 25 for further information.
The controller can operate in 4 different modes:
•
Automatic
•
Comfort
•
Night setback
•
Stand-by.
In Automatic mode, the controller alternates between two temperature setpoints: com-
fort and night setback. The flow temperature of a heat circuit and the hot-water tem-
perature are kept at either comfort or night setback temperature, according to a user-
defined 7-day plan.
In Comfort mode, flow and hot-water temperatures are maintained at daytime level.
In Night setback mode, the plant is maintained at night setback temperature, which is
normally lower than the comfort temperature.
Note:
The controller can be in night setback mode even during the daytime, for example
over the week-end.
In Stand-by mode, heating is off, but the plant is frost-protected at 6 °C.
EY.65.H4.02
Introducing the ECL 2000
3