Danfoss ECL 2000, User Manual

Page: 49 / 106

Service Settings
EY.65.H4.02
43
Pre-heat period This is the function that allows the controller to calculate the optimum starting time. If
the system is equipped with a room temperature sensor, this function is adaptive.
If no room temperature sensor is connected, the controller estimates the room tem-
perature as a function of the actual outdoor temperature and the default pre-heat pe-
riod entered by the operator (see below). Furthermore, if the system has been on night
setback for a long period, the controller increases the length of the pre-heat period. In
this way, the controller is able to compensate for fluctuations in outdoor temperature
and accumulated heat in buildings.
Display text Parameter Default value,
range Description
Default Default pre-
heat period Default value:
23 hours
Range:
0-24 hours
As default, you must enter a pre-heat
period that you estimate is suitable given
the following conditions:
•
Outdoor temperature 0 °C
•
Actual room temperature 5 °C
•
Comfort temperature setting 20 °C
•
Flow temperature 80 °C during the
heating period
Max. limit Maximum pre-
heat period Default value:
0 hours
Range:
0-24 hours
The maximum pre-heat period the system
is allowed to calculate and use. Change
this setting to enable the optimizer func-
tion
Calculated Calculated
pre-heat pe-
riod Range:
0-24 hours The pre-heat period calculated by the
controller using the actual outdoor tem-
perature. This parameter is read-only and
cannot be set
Cooling period These settings enable the controller to calculate the cooling period, i.e. how soon the
plant can be switched to night setback temperature while still ensuring that the room
temperature only drops by 1 K before the pre-programmed night setback time.
Display text Parameter Default value,
range Description
Default Default cool-
ing period Default value:
1 hour
Range:
0-24 hours
You must enter a default cooling period
corresponding to the following condi-
tions:
•
Outdoor temperature 0 °C
•
Actual room temperature 20 °C
•
Room temperature reduction = 1 K
Max. limit Maximum
cooling period Default value:
0 hours
Range:
0-24 hours
The maximum cooling period the system
is allowed to calculate and use. Change
this setting to enable the optimizer func-
tion
Calculated Calculated
cooling period Range:
0-24 hours The cooling period calculated by the
controller using the actual outdoor tem-
perature. This parameter is read-only and
cannot be set