BS EN 12098-3:2013 pdf download

BS EN 12098-3:2013 pdf download.Controls for heating systems Part 3: Control equipment for electrical heating systems.
3.21
switch points and time periods
3.21.1
swItch on time
point in time at which the controller inoreases the heating in order to readi the comfort room temperature
Note 1 to entry: If the optimum start luncDon is applied, the switch on bn s automabcaly deterntned by the controler. otherwise it is detenmned by the scheduler.
3.212
optimum start period
operating pre heat period between the switch on time and the beginning of comfort occupation period
3.21.3
beginning of comfort occupation period
user programmed switch point when the comfort room temperatise Is reached
3.21.4
comfort occupation period
operating period during which comfort room temperature is maintained
3.21.5
end of comfort occupation period
user programmed switch point when the room temperature is allowed to decrease under the comfort room temperature
Note 1 to entry: The room temperature set point Is switched to Economy and?or Budding Protection set point.
3.21.6
switch off time
point in time at which the controller switches off the heating
Note 1 to entry it the optimum stop function applied, the switch off time Is avionieticaly tieternined by the contrcller otherwise it IS detemn.d by the scheduler,
3.21.7
optimum stop period
operating penod between the optimal switch off time and the end of comfort occupation period
3.21.8
derogation function
temporary override of the program
Note 1 to entry: There are different poesibitiuies for derogation functions. Two examples of temporary overnde of the program by derogation and recovery of the periodic program are sh In Figure 4
Operation mode tot rooms which do not need to be In the comfort operation mode for an extended period of time tot energy saving.
The heating power is a function of the heating curve, based on the outside temperature and the economy room temperature set point
For the change from conifoil to economy operation mode, the controller shall allow a reduction of the healing power of at least 20 %
6.4.4 BuIlding protection operation mode
Mode of operation to protect the building from damages caused by low temperatures and hixnidity.
The controlled variable (i.e. healing power) is a function of the heating curve, based on the outside temperature and the building protection room temperature set point The building protection set point temperature is below the economy set point temperature.
6.4.5 AutomatIc operation mode
The operation mode (Comfort, Economy and/or Building Protection) is selected automatically according to the scheduler, actual date and tioie.
6.5 Frost protection
In all operating modes (except for manual emergency operation mode operation), a frost protection function shall be effective if the outdoor temperature falls below 2 C.
6.6 AdditIonal functions
6.6.1 General
These functions are optional. If implemented, the requirements of the corresponding function in this subclause have to be fulfilled.
6.6.2 Summerfwinter switch function
When the attenuated outside temperature exceeds the sumniertwinter heating limit, a change to summer operation will take place When the attenuated outside temperature falls below the summer/winter heating limit, a change to winter operation will take place. The summer/winter heating limit shall be adjustable.
6.6.3 S.t back function
During set back period, the reduced controlled variable (heating power) is valid The function switches off the heat generation.
6.6.4 OptImum start function
The optimum start function calculates the pre-heat time to reach the comfort temperature level at the beginrng of the comfort time period within a limit of +1-30 mm. Once the comfort level has been reached, the room temperature shal stay within +1- 0.5 K around the comfort room temperature.
6.6.5 OptImum stop function
The optimum stop function calculates the optimum switch-off time so that the room temperature at the end of the comfort period is within the allowable temperature decrease of -0,5 K of the comfort temperature level.