6 Operation
RITTAL Compact split cooling unit assembly and operating instructions
35
EN
6.1.6 Definin
g
s
y
s
tem me
ss
a
g
e
s
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 “6.1.7 Evaluating system
messages”, page 35.
See also Fig. 9 on page 34.
Tab. 4: System messages which may be evaluated via relays
The system messages A1 – A19 may additionally be
evaluated via two floating system message relays. In
this way, one of the two system message relays may
be allocated to each system message.
System message relays with change-over and nor-
mally open contact: See wiring diagrams at Section
“4.6.1 Installing the power supply”, page 29:
– 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
contacts change 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 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
6.1.7 Evaluatin
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s
tem me
ss
a
g
e
s
In the Comfort controller, system messages are indi-
cated 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 section
“6.1.8 Resetting the Comfort controller”, page 37).
Pro
g
r.
level
Di
s
play
s
creen
Min.
value
Max.
value
Factory
s
ettin
g
Type or location of fault
7
A1
0
2
0
Safe door open
8
A2
0
2
0
Safe internal temperature too high
9
A3
0
2
0
Filter monitoring
10
A4
0
2
0
Ambient temperature too high/low
11
A5
0
2
0
Icing hazard
12
A6
0
2
1
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
