36 RITTAL outdoor cooling unit assembly and operating instructions
6 Operation
6.1.6 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 “6.1.8 Evaluating system
messages”, page 37.
See also Fig. 9 on page 35.
Tab. 3: System messages which may be evaluated via relays
System messages A1 – A19 may additionally be
evaluated via a relay with floating changeover
contact; refer to the connection diagrams under
“4.5.2 Installing the power supply”, page 30:
– Terminal 3: NC (normally closed)
– Terminal 4: C (connection of the supply voltage
to the system message relay)
– Terminal 5: NO (normally open)
The NC and NO definitions refer to the de-energised
state. As soon as power is applied to the cooling unit,
the system message relay picks up, so that the relay
contact changes status (contact 3 – 4 open; contact
4 – 5 closed).
This is the normal operating state of the cooling unit.
As soon as a system message occurs or the power
supply is interrupted, the relay drops out.
Program system messages with the following values:
0: System message is not sent to the system
message relay, but merely appears in the
display
1: System message is evaluated by relay 2
2: System message is evaluated by relay 2
If 1 or 2 is selected, the system will automatically
generate to relay 2, because relay 1 is used for the
heating function.
Progr.
level
Display
screen
Para-
meter
Min.
value
Max.
value
Type or location of fault
7 A1 0 2 0 Enclosure door open
8 A2 0 2 0 Internal temperature of enclosure too high
10 A4 0 2 0 Ambient temperature too high/too low
11A5 020 Icing hazard
12A6 021 PSA
H
pressure-operated switch
13 A7 0 2 2 Evaporator coil
14 A8 0 2 1 Condensate warning
15 A9 0 2 1 Condenser fan blocked or defective
16 A10 0 2 1 Evaporator fan blocked or defective
17 A11 0 2 2 Compressor
18 A12 0 2 1 Condenser
19 A13 0 2 1 Ambient temperature sensor
20 A14 0 2 1 Icing temperature sensor
21 A15 0 2 1 Condensate warning temperature sensor
22 A16 0 2 1 Internal temperature sensor
23 A17 0 2 1 Phase monitoring
24 A18 0 2 0 EPROM
25 A19 0 2 0 LAN/Master-slave
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