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35
ENG
ir0300028EN rel. 1.1 - 05.05.2017
The fan can be switched off in the following situations:
•
when the compressor is off (parameter F2);
•
during the defrost (parameter F3).
During the dripping period (parameter dd > 0) and the post-dripping
period (parameter Fd > 0) the evaporator fans are always off . This is
useful to allow the evaporator to return to temperature after defrosting,
thus avoiding blowing warm hot and moist air into the refrigerator. The
evaporator fans can be forced on during normal control (parameter F2)
and during defrost (parameter F3).
Par. Description Def Min Max UOM
dd Dripping time after defrost (fans off ) 2 0 15 min
F2 Evaporator fans with compressor off
0 = See F0
1 = Always off
1 0 1 -
F3 Evaporator fans during defrost
0/1=on/off
1 0 1 -
Fd Post-dripping time (fans off ) 1 0 15 min
Tab. 6.n
6.11 Condenser fans
The condenser fans are activated based on parameters F4 and F5.
After the compressor is fi rst started, the condenser fans are activated at
F4+0.2 degrees to off set any rapid temperature increases that the probe
cannot keep up with. Subsequently, the fans are switched on and off at
F4+F5 and F4.
Par. Description Def Min Max UOM
F4 Condenser fan deactivation temperature 40 -50 200 °C/°F
F5 Condenser fan activation diff erential 5.0 0.1 20 °C/°F
Tab. 6.o
ON
OFF
FAN
F4 + F5
Sc
F4
F4 + 0.2
First
switch-on
t
t
Fig. 6.t
Key
Sc Condenser probe Sv Virtual probe
FAN Condenser fans t Time
F4 Deactivation temperature F5 Diff erential
Note: if no condenser probe is selected, the condenser fan output is
deactivated.
6.12 Duty setting (par. c4)
If alarm “rE” (virtual control probe fault) is activated, this parameter is
used to ensure operation of the compressor until the fault is resolved.
As the compressor is no longer able to operate based according to the
temperature (due to the probe fault), it is made to run cyclically with a
running time equal to the value assigned to parameter c4 and a fi xed OFF
time of 15 minutes.
Par. Description Def Min Max UOM
c4 Compressor running time with duty setting 0 0 100 min
ON
OFF
CMP
c4
15
t
Fig. 6.u
6.13 Running time defrost (par. d10, d11)
Running time is a special function that determines when the refrigeration
unit needs defrosting. In particular, it is assumed that if the evaporator
temperature measured by probe Sd remains continuously below a
certain set threshold (d11) for a certain time (d10), the evaporator may
be frozen and a defrost is activated. The time is reset if the temperature
returns above the threshold.
Par. Description Def Min Max UOM
d10 Defrost time in “Running time” mode
0 = function disabled
0 0 250 hour
d11 Running time defrost temperature threshold 1 -20 20 °C/°F
Tab. 6.p
ON
OFF
DEF
d11
Sd
dt1
d10
t
t
Fig. 6.v
Key
Sd Defrost probe t time
DEF Defrost