6 Operation
RITTAL cooling unit assembly and operating instructions 29
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 30.
See also Fig. 39 on page 28.
Tab. 5: 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 alarm relay with normally open contact: see
connection diagrams under “4.6.3 Installing the
power supply”, page 14:
– Terminal 3: NO (normally open, relay 2)
– Terminal 4: C (connection of the supply voltage
to the system message relay)
– Terminal 5: NO (normally open, relay 1)
The definition NO refers to the de-energised state.
As soon as power is applied to the cooling unit, both
system message relays (relay 1 and 2) energise.
This is the normal operating state of the cooling unit.
As soon as a system message occurs or the power
supply is interrupted, the corresponding relay will
drop out and open the contact.
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
Progr.
level
Display
screen
Min.
value
Max.
value
Factory
setting
Type or location of fault
7A1020 Enclosure door open
8A2020 Internal temperature of enclosure too high
9A3020 Filter monitoring
10 A4 0 2 0 Ambient temperature too high/too 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
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