AIR CONDITIONING

1. Presentation of the system
When we started the conception of the C7000 control
system, we wanted to offer a maximum of operating
safety for industrial applications combined with a versatility
for the operator interface. The result was a trinity
of interfaces with one controller. The C7000, the C7000
Plus and the C7000 Advanced.
Distributed intelligence in networking cells represents the
most reliable system whenever operating safety is the
target. This is exactly how the Stulz C7000 control system
works, each A/C unit possesses its own controller while
all controllers can be linked together in a bus system.
This way a natural redundancy is obtained which assures
the system functions with the least expense. And we locate
the intelligence there where it is needed, in the A/C
unit without long cables to mess up the signals.
Whereas the C7000 Advanced provides the well known
operating comfort - as did already the C6000 - the
C7000 can bring to bear his advantages when it comes
to modifications in the configuration of a large air
conditioning system with several units. The C7000 Plus
in comparison represents a cost-effective solution for
smaller installations.
Its text-based display can certainly not compete with
the graphical display of the C7000 Advanced, but the
scrollable menus allow to pool many parameters in one
menu, which is comfortable for the navigation.
The idea of the third interface was to use a device which
is present everywhere, a computer. Using the screen
of a Laptop or PC provides the best way of visualizing
parameter settings. This is the most comfortable way of
doing a component-related configuration.
Beyond the basic air conditioning functions, the C7000
control system provides some interesting features like an
intelligent management of high/low pressure-alarms, a
proportional fan speed control which opens a wide spectrum
of applications and time-based functions like:
- week timer
- unit sequencing within definable unit groups
The heart of the C7000 control system is the C7000 I/O
controller on which up to 4 EAIO/EDIO boards for additional
in- and outputs can be perpendicularly plugged.
The exploitation of the third dimension provides maximum
accessibility and an easy board exchange in case
of modifications.
The C7000 control systems manages 4 busses:
1. IIC-bus for the communication between the C7000
I/O controller and the EAIO/EDIO boards
2. RS485 IO-bus for the communication among the
A/C units
3. RS485 BMS-bus for the communication with a
building management system
4. RS485 Aux-bus for the communication with optional
components capable for bus connection
For service purposes like software download and control
via laptop a RS232 interface is located on the I/O controller
the same as on the C7000 Advanced.
Analogous (A) and digital (D) in- and outputs
A-IN A-OUT D-IN D-OUT
IOC-board 5 4 11 7
EAIO-board 4 4 / /
EDIO-board / / 8 6
Maximum equipment
IOC + 4 EAIO 21 20 11 7
IOC + 4 EDIO 5 4 43 31
IOC-board
EAIO-board
EDIO-board
EBUS-board
C7000AT-board
Interfaces
2 x RS485 IO-bus, terminals
4 x IIC-Bus, SUB-D15
EBUS conn. SUB-D15
RS232, SUB-D9
IIC-Bus, SUB-D15
IIC-Bus, SUB-D15
I/O board conn. SUB-D15
RS485 BMS-bus, terminals
RS485 Aux.-bus, terminals
2 x RS485 IO-bus + BMS,
terminals
2 x RS232 BMS + service,
SUB-D9
E/1006/57/5