24
Rittal air/water heat exchanger assembly instructions
6 Operation
EN
6.2.6 Defining system messages for evaluation
System messages are shown on the display screen
of the Comfort controller via the displays A1 to A20
and E0.
A more detailed explanation of the system messages
may be found in section “6.2.8 Evaluating system
messages”, page 25.
See also Fig. 20 on page 23.
Tab. 5: System messages which may be evaluated via relays
The system messages A01 – A20 may additionally
be evaluated via two floating system message re-
lays. In this way, one of the two system message
relays may be allocated to each system message.
(System message relays with change-over and
normally open contact: See wiring diagrams at
“4.7.2 Installing the power supply”, page 15:
– Terminal 3: NC (normally closed)
– Terminal 4: C (connection of the supply voltage
to the system message relay)
– Terminal 5: NO (normally opened)
The NC and NO definitions refer to the de-energised
state. As soon as power is applied to the air/water
heat exchanger, the system message relay picks up,
so that the relay contacts change status (contact
3 – 4 open; contact 4 – 5 closed). This is the normal
operating state of the air/water heat exchanger.
As soon as a system message occurs or the power
supply is interrupted, the relay drops out.
Program system messages with the value
0:
System message is not sent to the system
message relay, but merely appears in the
display
1:
System message is evaluated by relay 1
2:
System message is evaluated by relay 2
6.2.7 Setting the master-slave identifier
When several air/water heat exchangers are con-
nected together (maximum ten), one of the air/water
heat exchangers must be defined as the “master”
and the others as “slaves”. For this purpose, assign
a corresponding identifier (address) to each air/
water heat exchanger which will enable the air/water
heat exchanger 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 air/water heat
exchangers.
Progr.
level
Display
screen
Min.
value
Max.
value
Factory
setting
Type or location of fault
7
A01
0
2
0
Enclosure door open
8
A02
0
2
0
Internal temperature of enclosure too high
9
A08
0
2
1
Condensate warning
10
A10
0
2
1
Fan blocked or defective
11
A16
0
2
1
Internal temperature sensor
12
A18
0
2
1
EPROM
13
A19
0
2
0
LAN/Master-Slave
14
A20
0
2
0
Voltage drop
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.
Summary of Contents for SK 3209. Series
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