Zone Control - Stulz S-Klima C7000 User Manual

8.2 Zone control

The zone concept is based on the idea of keeping a homogeneous room climate
within a spatial area by spatially distributing the chilling.
Up to 20 zones can be defined within an I/O bus. A zone is defined if at least
one unit is allocated to that zone. A unit is allocated to a zone by setting a zone
number in the title line of the
This has to be carried out for each unit (each IOC) separately.
The setpoints are set individually for each unit but should only deviate very
slightly from one another, if at all.
Average value calculation
Calculating the average of the measurement values is a basic principle of the
zone control. According to this, there is only one room temperature within a
zone. It is calculated by averaging the values of all connected room temperature
sensors. The same applies for the room humidity, supply air temperature, supply
air humidity, outside temperature, water inlet temperature 1 and the differential
pressure, if applicable.
The average value calculation for all of the parameters mentioned above can
be issued using the parameters in the sixth line of the Z1 menu (0 = off, 1 =
on). The average value calculation for the air differential pressure during differ-
ential pressure control can be enabled or canceled in the seventh line. Using
the parameter in the eighth line of the same menu, you can define whether the
standby units should be included in the average value calculation (0=no, 1=yes).
Units that have been switched off locally (e.g. via the start/stop button on the
C7000AT) are part of the average value calculation.
If the following prerequisites are fulfilled:
- zone contains a few units only;
- a standby unit, which was out of operation for a long time, is switched-in;
- the average value calculation for temp./humid is switched on;
- the units are equipped with Free Cooling;
- Free Cooling is enabled,
the calculated average value may be so high, because of the accumulation of
heat at the standby unit (the water in the standby unit cooling water lines takes
on the room temperature), that Free Cooling is disabled (GEoff parameter),
even though the system's water temperature is actually appropriate for it. To
circumvent this problem, you can set a time delay for evaluating the average
value. During this time the accumulation of heat at the standby unit can dissipate.
Standby units
In menus Z0 and Z2a, the unit can be set as a standby unit by adjusting the
parameter in the third line to "1".
The presence of standby units in a zone increases the operational reliability of
the air conditioning technology and allows unit capacity losses to be replaced
by standby capacities.
48
Z1.
menu
Config/Zone (Z1)
Config/Zone/more/more(Z2a)
Operate/Zone (Z0)
Config/Zone/more/more(Z2a)
BA C7000 for EC Tower | EN | 01-2019 | 1000755
Setting zone num-
bers 1-20