User Manual

97
Definition of classes
Residential Non residential
D C B A D C B A
AUTOMATIC CONTROL
4 VENTILATION AND AIR CONDITIONING CONTROL
4.9 Supply air temperature control
0 No automatic control
1 Constant set point
X 2 Variable set point with outside temperature compensation
3 Variable set point with load dependent compensation
4.10 Humidity control
0 No automatic control
1 Dewpoint control
2 Direct humidity control
Result
To meet energy efficiency class B, the BAC must be equipped with processing functions marked with
“X” in the left column.
Functions with main impact on EE
Following the BACS and TBM function which have the main impact on energy consumption of a
building:
· BACS and TBM functions with the purpose to control or monitor a plant or section of a plant which
is not installed in the building do not have to be considered when determining the class even if
they are shaded for that class. For example, to be in class B for a building with no cooling system
no individual room control with communication is required for emission control of cooling systems.
· If a specific function is required to be in a specific BACS efficiency class, there is no need for it to
be strictly required throughout the building. If the designer can give good reasons that the
application of a function does not bring a benefit in a specific case it can be ignored. For example
if the designer can show that the heating load of a set of rooms is only dependent on the outside
temperature and can be compensated with one central controller, no individual room control by
thermostatic valves or electronic controllers is required to be in class C.
· Not all BACS and TBM functions in the table of section 4.2 are applicable to all types of building
services. Therefore, BACS and TBM functions which have no substantial impact (<5%) within the
kind of energy use for heating, cooling, ventilation, DHW or lighting do not have to be classified.