109 © STULZ GmbH – all rights reserved EN/06.2019/G57
C7000 INSTRUCTIONS fOR A/C UNITS
6.2 Zone control
Setting the zone
number 120
The zone concept is based on the idea to obtain homogeneous room
conditioned within a determined space by distributed generation of
conditionned air.
Within an IO bus up to 20 zones can be defined. A zone is defined if
at least one unit is assigned to this zone. The assignment of a unit to
a zone is done by setting a zone number in the main line of menu Z1.
This assignment must be done individually for each unit (each IOC).
Although the set values can be individually adjusted for each unit,
they should If at all, only slightly vary.
Average value determination
A basic principle of the zone control is the calculation of average
values of the measured values. Within a zone only one room tempe-
rature exists which is calculated as the average value of all connec-
ted room temperature sensors.
The same applies for the room humidity, supply temperature, supply
humidity, outside air temperature, water inlet temperature 1 and dif-
ferential pressure, if existant.
The determination of average values for all above mentioned para-
meters except the differential air pressure can be disabled by the
parameter in the sixth line of menu Z1 (0 = off, 1 = on). The deter-
mination of average values for the room air pressure of the differenti-
al pressure control can be en-/disabled in the seventh line.
By the parameter in the eighth line of the same menu you can set
whether standby units shall take part in the calculation of average
values. (0 = no, 1 = yes).
A/C units which have been locally switched off (e.g. by the start/stop
key at the C7000AT) take part in the calculation of average values.
If the following conditions exist:
- the zone encloses only a few units
- a standby unit, which has long been out of service, is additionally
switched on.
- the determination of average values for temp./humidity is acitvated.
- the A/C units are equipped with free cooling functionality.
- free cooling is enabled.
it can occur, that the calculated average value increases so much by the accumulation of heat in the stand-
by unit (the water in the standby unit cooling water lines takes on the room temperature), that free cooling is
disabled (GEoff parameter), although the system water temperature is actually appropriate for it. To avoid this
problem, you can set a delay time for the evaluation of the average value, in which the heat accumulation in the
standby unit can dissipate.
Config/Zone (Z1)
Config/Zone/more/more
(Z2a)
Config/Zone (Z1)
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