30
Controlled alarms Unit
shutdown
Aff ected circ.
shutdown
Reset
Type
Timing Actuation Alarm
level (**)
Graphic
terminal
User
terminal
Add.
Alarm driver Eliwell address 71 Yes Yes Manual No Shutdown of circuit 1
1 (2 after
delay)
AL111 --- 369
Alarm driver Eliwell address 72 Yes Yes Manual No Shutdown of circuit 2
1 (2 after
delay)
AL112 --- 370
Power cut-off for a period longer than
2 hours
No
Yes,
all circuits
Auto
Yes, 2
hours
Blocking of compressors for 8
hours to ensure heating of the
crankcase heater
3 AV01 --- ---
Warning whenever the supply fan speed
limit (rpm) is exceeded
Yes No Auto
Yes, 30
min
Only indication or unit shutdown
(confi gurable by parameter)
3 or 1 AV02 --- ---
Warning whenever the return fan speed
limit (rpm) is exceeded
Yes No Auto
Yes, 30
min
Only indication or unit shutdown
(confi gurable by parameter)
3 or 1 AV03 --- ---
Low flow warning in constant supply
pressure control
No
Yes,
all circuits
Auto Yes, 120 s
Without permissions all the
thermal power elements of the unit
2 AV04 --- ---
Warning whenever return fl ow setpoint >
supply fl ow setpoint, with overpressure
control
No No Auto No Only indication 0 AV05 --- ---
A2L protection mode Yes
Yes,
all circuits
Manual No Unit in A2L protection mode 3 AV06 --- ---
Low overheating SH in the valve of circuit 1 No No Auto No Only indication 0 AV07 --- ---
Low overheating SH in the valve of circuit 2 No No Auto No Only indication 0 AV08 --- ---
Low overheating SH in the valve of
recovery circuit
No No Auto No Only indication 0 AV09 --- ---
Low evaporation temperature of circuit 1 No No Auto No Only indication 0 AV10 --- ---
Low evaporation temperature of circuit 2 No No Auto No Only indication 0 AV11 --- ---
Low evaporation temperature of recovery
circuit
No No Auto No Only indication 0 AV12 --- ---
High evaporation temperature of circuit 1 No No Auto No Only indication 0 AV13 --- ---
High evaporation temperature of circuit 2 No No Auto No Only indication 0 AV14 --- ---
High evaporation temperature of recovery
circuit
No No Auto No Only indication 0 AV15 --- ---
High condensation temperature of circuit 1 No No Auto No Only indication 0 AV16 --- ---
High condensation temperature of circuit 2 No No Auto No Only indication 0 AV17 --- ---
High condensation temperature of rec.
circuit
No No Auto No Only indication 0 AV18 --- ---
Low suction temperature of circuit 1 No No Auto No Only indication 0 AV19 --- ---
Low suction temperature of circuit 2 No No Auto No Only indication 0 AV20 --- ---
Low suction temperature of recovery circuit No No Auto No Only indication 0 AV21 --- ---
Defrost by minimum pressure of circuit 1 No Yes Auto(*) No Only indication 0 AV22 --- ---
Defrost by minimum pressure of circuit 2 No Yes Auto(*) No Only indication 0 AV23 --- ---
12 - ALARMS
(*) If a certain number of alarms take place over a period of time, this reset can be changed to “Manual” (confi gurable by parameters).
(**) Alarm levels with “Backup”. Please refer to the meaning in the following section.
12.4. Alarm levels with “Back-up”
“Back-up in case of alarm” function always prevails over “Extended
Back-up”, i.e. if one unit has to operate for a specifi c week but a
severe alarm appears, it will automatically switch operation to the
other unit.
Alarm levels are set to determine which of the two units should
operate.
Note: In some cases the alarm level can be set by parameters.
The following table indicates the di erent alarm levels:
• Level 0: no alarm
• Level 1: mild alarm
• Level 2: severe alarm
• Level 3: critical alarm
It is also possible to change the alarm level, from level 1 to level 2,
if it persists for a period of time (default 20 minutes).
Based on these alarm levels, the software performs a comparison
between the two units and sets which one should work:
• If both units have the same alarm level they will continue to work
the same as until then..
• With di erent alarm level, the unit with the lowest alarm level will
operate.
• It can also be confi gured by parameter that does not exist a back-
up with alarm levels 1 and 2. In this case the units only switch with
the alarm level 3.
Important: the software incorporates a series of securities that
guarantee that one of the units will always work (and only one).
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