6 Operation
RITTAL outdoor cooling unit assembly and operating instructions 37
6.1.7 Setting the master-slave identifier
When several cooling units are connected together
(maximum ten), one of the cooling units must be
defined as the “master” and the others as “slaves”.
For this purpose, assign a corresponding identifier
(address) to each cooling unit which will enable the
cooling unit to be identified in the network.
If one of the slave units reaches the set temperature
or if the door limit switch function is activated, the
affected slave unit will report to the master unit,
which then deactivates all the other cooling units.
On the master cooling unit (00 = factory setting),
set the number of slave units there are in the network:
01: Master with 1 slave cooling unit
02: Master with 2 slave cooling units
03: Master with 3 slave cooling units
04: Master with 4 slave cooling units
05: Master with 5 slave cooling units
06: Master with 6 slave cooling units
07: Master with 7 slave cooling units
08: Master with 8 slave cooling units
09: Master with 9 slave cooling units
On the slave cooling unit (00 = factory setting),
set its own address:
11: Slave cooling unit no. 1
12: Slave cooling unit no. 2
13: Slave cooling unit no. 3
14: Slave cooling unit no. 4
15: Slave cooling unit no. 5
16: Slave cooling unit no. 6
17: Slave cooling unit no. 7
18: Slave cooling unit no. 8
19: Slave cooling unit no. 9
Fig. 10: Master-slave connection (example)
For further connection examples, see “4.5.1 Bus
connection (only in conjunction with several units
with Comfort controller)”, page 30.
For details of how to set the identifier, see “6.1.4
Editable parameters”, page 34 or “6.1.5 Program-
ming overview”, page 35, parameter “Ad”.
6.1.8 Evaluating system messages
In the Comfort controller, system messages are
indicated by a number in the display.
Following the appearance of messages A03, A06
and A07 and after rectifying their cause, you will
need to reset the Comfort controller (see “6.1.9
Resetting the Comfort controller”, page 39).
Notes:
– Only one unit may be configured as
master, and its identifier must match
the number of connected slave units.
– The slave units must have different
identifiers.
– The identifiers must be numbered in
ascending order without any gaps.
Master
02
Slave
11
Slave
12
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